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remove the lexer

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This commit is contained in:
ConnorSkees 2020-03-29 13:28:17 -04:00
parent ae5a69a91b
commit 07505399da
20 changed files with 1184 additions and 1302 deletions
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66
src/args.rs
View File

@ -1,13 +1,13 @@
use std::collections::BTreeMap;
use std::iter::Peekable;
use crate::common::Symbol;
use crate::common::Pos;
use crate::error::SassResult;
use crate::scope::Scope;
use crate::selector::Selector;
use crate::utils::{devour_whitespace, devour_whitespace_or_comment};
use crate::utils::{devour_whitespace, devour_whitespace_or_comment, eat_ident};
use crate::value::Value;
use crate::{Token, TokenKind};
use crate::Token;
#[derive(Debug, Clone, Eq, PartialEq)]
pub(crate) struct FuncArgs(pub Vec<FuncArg>);
@ -59,8 +59,8 @@ pub(crate) fn eat_func_args<I: Iterator<Item = Token>>(
devour_whitespace(toks);
while let Some(Token { kind, .. }) = toks.next() {
let name = match kind {
TokenKind::Variable(v) => v,
TokenKind::Symbol(Symbol::CloseParen) => break,
'$' => eat_ident(toks, scope, super_selector)?,
')' => break,
_ => todo!(),
};
let mut default: Vec<Token> = Vec::new();
@ -70,11 +70,11 @@ pub(crate) fn eat_func_args<I: Iterator<Item = Token>>(
_ => todo!("unexpected eof"),
};
match kind {
TokenKind::Symbol(Symbol::Colon) => {
':' => {
devour_whitespace(toks);
while let Some(tok) = toks.peek() {
match &tok.kind {
TokenKind::Symbol(Symbol::Comma) => {
',' => {
toks.next();
args.push(FuncArg {
name,
@ -86,7 +86,7 @@ pub(crate) fn eat_func_args<I: Iterator<Item = Token>>(
});
break;
}
TokenKind::Symbol(Symbol::CloseParen) => {
')' => {
args.push(FuncArg {
name,
default: Some(Value::from_tokens(
@ -104,8 +104,8 @@ pub(crate) fn eat_func_args<I: Iterator<Item = Token>>(
}
}
}
TokenKind::Symbol(Symbol::Period) => todo!("handle varargs"),
TokenKind::Symbol(Symbol::CloseParen) => {
'.' => todo!("handle varargs"),
')' => {
args.push(FuncArg {
name,
default: if default.is_empty() {
@ -120,7 +120,7 @@ pub(crate) fn eat_func_args<I: Iterator<Item = Token>>(
});
break;
}
TokenKind::Symbol(Symbol::Comma) => args.push(FuncArg {
',' => args.push(FuncArg {
name,
default: None,
}),
@ -129,11 +129,7 @@ pub(crate) fn eat_func_args<I: Iterator<Item = Token>>(
devour_whitespace(toks);
}
devour_whitespace(toks);
if let Some(Token {
kind: TokenKind::Symbol(Symbol::OpenCurlyBrace),
..
}) = toks.next()
{
if let Some(Token { kind: '{', .. }) = toks.next() {
} else {
todo!("expected `{{` after args")
}
@ -146,45 +142,47 @@ pub(crate) fn eat_call_args<I: Iterator<Item = Token>>(
super_selector: &Selector,
) -> SassResult<CallArgs> {
let mut args: BTreeMap<String, Value> = BTreeMap::new();
devour_whitespace_or_comment(toks);
devour_whitespace_or_comment(toks)?;
let mut name: String;
let mut val: Vec<Token> = Vec::new();
loop {
match toks.peek().unwrap().kind {
TokenKind::Variable(_) => {
let v = toks.next().unwrap();
devour_whitespace_or_comment(toks);
if toks.peek().unwrap().is_symbol(Symbol::Colon) {
'$' => {
toks.next();
let v = eat_ident(toks, scope, super_selector)?;
devour_whitespace_or_comment(toks)?;
if toks.peek().unwrap().kind == ':' {
toks.next();
name = v.kind.to_string();
name = v;
} else {
val.push(v);
val.push(Token::new(Pos::new(), '$'));
val.extend(v.chars().map(|x| Token::new(Pos::new(), x)));
name = args.len().to_string();
}
}
TokenKind::Symbol(Symbol::CloseParen) => {
')' => {
toks.next();
return Ok(CallArgs(args));
}
_ => name = args.len().to_string(),
}
devour_whitespace_or_comment(toks);
devour_whitespace_or_comment(toks)?;
while let Some(tok) = toks.next() {
match tok.kind {
TokenKind::Symbol(Symbol::CloseParen) => {
')' => {
args.insert(
name,
Value::from_tokens(&mut val.into_iter().peekable(), scope, super_selector)?,
);
return Ok(CallArgs(args));
}
TokenKind::Symbol(Symbol::Comma) => break,
TokenKind::Symbol(Symbol::OpenSquareBrace) => {
',' => break,
'[' => {
val.push(tok);
val.extend(read_until_close_square_brace(toks));
}
TokenKind::Symbol(Symbol::OpenParen) => {
'(' => {
val.push(tok);
val.extend(read_until_close_paren(toks));
}
@ -201,7 +199,7 @@ pub(crate) fn eat_call_args<I: Iterator<Item = Token>>(
)?,
);
val.clear();
devour_whitespace_or_comment(toks);
devour_whitespace(toks);
if toks.peek().is_none() {
return Ok(CallArgs(args));
@ -214,7 +212,7 @@ fn read_until_close_paren<I: Iterator<Item = Token>>(toks: &mut Peekable<I>) ->
let mut scope = 0;
for tok in toks {
match tok.kind {
TokenKind::Symbol(Symbol::CloseParen) => {
')' => {
if scope <= 1 {
v.push(tok);
return v;
@ -222,7 +220,7 @@ fn read_until_close_paren<I: Iterator<Item = Token>>(toks: &mut Peekable<I>) ->
scope -= 1;
}
}
TokenKind::Symbol(Symbol::OpenParen) => scope += 1,
'(' => scope += 1,
_ => {}
}
v.push(tok)
@ -235,7 +233,7 @@ fn read_until_close_square_brace<I: Iterator<Item = Token>>(toks: &mut Peekable<
let mut scope = 0;
for tok in toks {
match tok.kind {
TokenKind::Symbol(Symbol::CloseSquareBrace) => {
']' => {
if scope <= 1 {
v.push(tok);
return v;
@ -243,7 +241,7 @@ fn read_until_close_square_brace<I: Iterator<Item = Token>>(toks: &mut Peekable<
scope -= 1;
}
}
TokenKind::Symbol(Symbol::OpenSquareBrace) => scope += 1,
'[' => scope += 1,
_ => {}
}
v.push(tok)

21
src/atrule/function.rs
View File

@ -4,13 +4,12 @@ use super::eat_stmts;
use crate::args::{eat_func_args, CallArgs, FuncArgs};
use crate::atrule::AtRule;
use crate::common::Symbol;
use crate::error::SassResult;
use crate::scope::Scope;
use crate::selector::Selector;
use crate::utils::devour_whitespace;
use crate::utils::{devour_whitespace, eat_ident};
use crate::value::Value;
use crate::{Stmt, Token, TokenKind};
use crate::{Stmt, Token};
#[derive(Debug, Clone)]
pub(crate) struct Function {
@ -29,23 +28,15 @@ impl Function {
scope: Scope,
super_selector: &Selector,
) -> SassResult<(String, Function)> {
let Token { kind, .. } = toks
.next()
.expect("this must exist because we have already peeked");
devour_whitespace(toks);
let name = match kind {
TokenKind::Ident(s) => s,
_ => return Err("Expected identifier.".into()),
};
let name = eat_ident(toks, &scope, super_selector)?;
devour_whitespace(toks);
let args = match toks.next() {
Some(Token {
kind: TokenKind::Symbol(Symbol::OpenParen),
..
}) => eat_func_args(toks, &scope, super_selector)?,
Some(Token { kind: '(', .. }) => eat_func_args(toks, &scope, super_selector)?,
_ => return Err("expected \"(\".".into()),
};
devour_whitespace(toks);
let body = eat_stmts(toks, &mut scope.clone(), super_selector)?;
devour_whitespace(toks);

64
src/atrule/if_rule.rs
View File

@ -1,16 +1,15 @@
use std::iter::Peekable;
use super::{eat_stmts, AtRule, AtRuleKind};
use super::{eat_stmts, AtRule};
use crate::common::Symbol;
use crate::error::SassResult;
use crate::scope::Scope;
use crate::selector::Selector;
use crate::utils::{
devour_whitespace_or_comment, read_until_closing_curly_brace, read_until_open_curly_brace,
devour_whitespace, eat_ident, read_until_closing_curly_brace, read_until_open_curly_brace,
};
use crate::value::Value;
use crate::{Stmt, Token, TokenKind};
use crate::{Stmt, Token};
#[derive(Debug, Clone)]
pub(crate) struct If {
@ -35,37 +34,50 @@ impl If {
let mut branches = Vec::new();
let init_cond = read_until_open_curly_brace(toks);
toks.next();
devour_whitespace_or_comment(toks);
devour_whitespace(toks);
let mut init_toks = read_until_closing_curly_brace(toks);
init_toks.push(toks.next().unwrap());
devour_whitespace_or_comment(toks);
devour_whitespace(toks);
branches.push(Branch::new(init_cond, init_toks));
let mut else_ = Vec::new();
loop {
if let Some(tok) = toks.peek() {
if tok.kind == TokenKind::AtRule(AtRuleKind::Else) {
if toks.peek().is_some() {
if toks.peek().unwrap().kind == '@' {
toks.next();
devour_whitespace_or_comment(toks);
} else {
break;
}
if eat_ident(toks, &Scope::new(), &Selector::new())?.to_ascii_lowercase() == "else"
{
devour_whitespace(toks);
if let Some(tok) = toks.next() {
devour_whitespace_or_comment(toks);
if tok.kind.to_string().to_ascii_lowercase() == "if" {
let cond = read_until_open_curly_brace(toks);
toks.next();
devour_whitespace_or_comment(toks);
let mut toks_ = read_until_closing_curly_brace(toks);
toks_.push(toks.next().unwrap());
devour_whitespace_or_comment(toks);
branches.push(Branch::new(cond, toks_))
} else if tok.is_symbol(Symbol::OpenCurlyBrace) {
else_ = read_until_closing_curly_brace(toks);
toks.next();
break;
} else {
return Err("expected \"{\".".into());
devour_whitespace(toks);
match tok.kind.to_ascii_lowercase() {
'i' if toks.next().unwrap().kind.to_ascii_lowercase() == 'f' => {
toks.next();
let cond = read_until_open_curly_brace(toks);
toks.next();
devour_whitespace(toks);
let toks_ = read_until_closing_curly_brace(toks);
toks.next();
devour_whitespace(toks);
branches.push(Branch::new(cond, toks_))
}
'{' => {
else_ = read_until_closing_curly_brace(toks);
dbg!(&else_);
toks.next();
break;
}
_ => {
return Err("expected \"{\".".into());
}
}
} else {
break;
}
} else {
break;
@ -74,7 +86,9 @@ impl If {
break;
}
}
devour_whitespace_or_comment(toks);
devour_whitespace(toks);
dbg!(&branches);
Ok(If { branches, else_ })
}

75
src/atrule/mixin.rs
View File

@ -5,12 +5,13 @@ use super::eat_stmts;
use crate::args::{eat_call_args, eat_func_args, CallArgs, FuncArgs};
use crate::atrule::AtRule;
use crate::common::Symbol;
use crate::error::{SassError, SassResult};
use crate::error::SassResult;
use crate::scope::Scope;
use crate::selector::Selector;
use crate::utils::devour_whitespace;
use crate::{eat_expr, Expr, RuleSet, Stmt, Token, TokenKind};
use crate::utils::{
devour_whitespace, devour_whitespace_or_comment, eat_ident, read_until_closing_curly_brace,
};
use crate::{eat_expr, Expr, RuleSet, Stmt, Token};
#[derive(Debug, Clone)]
pub(crate) struct Mixin {
@ -36,46 +37,19 @@ impl Mixin {
scope: &Scope,
super_selector: &Selector,
) -> SassResult<(String, Mixin)> {
let Token { kind, .. } = toks
.next()
.expect("this must exist because we have already peeked");
devour_whitespace(toks);
let name = match kind {
TokenKind::Ident(s) => s,
_ => return Err("Expected identifier.".into()),
};
let name = eat_ident(toks, scope, super_selector)?;
devour_whitespace(toks);
let args = match toks.next() {
Some(Token {
kind: TokenKind::Symbol(Symbol::OpenParen),
..
}) => eat_func_args(toks, scope, super_selector)?,
Some(Token {
kind: TokenKind::Symbol(Symbol::OpenCurlyBrace),
..
}) => FuncArgs::new(),
Some(Token { kind: '(', .. }) => eat_func_args(toks, scope, super_selector)?,
Some(Token { kind: '{', .. }) => FuncArgs::new(),
_ => return Err("expected \"{\".".into()),
};
devour_whitespace(toks);
let mut nesting = 1;
let mut body = Vec::new();
while nesting > 0 {
if let Some(tok) = toks.next() {
match &tok.kind {
TokenKind::Symbol(Symbol::OpenCurlyBrace)
// interpolation token eats the opening brace but not the closing
| TokenKind::Interpolation => nesting += 1,
TokenKind::Symbol(Symbol::CloseCurlyBrace) => nesting -= 1,
_ => {}
}
body.push(tok)
} else {
return Err("unexpected EOF (TODO: better message)".into());
}
}
let mut body = read_until_closing_curly_brace(toks);
body.push(toks.next().unwrap());
Ok((name, Mixin::new(scope.clone(), args, body, Vec::new())))
}
@ -147,49 +121,42 @@ pub(crate) fn eat_include<I: Iterator<Item = Token>>(
scope: &Scope,
super_selector: &Selector,
) -> SassResult<Vec<Stmt>> {
toks.next();
devour_whitespace(toks);
let Token { kind, pos } = toks
.next()
.expect("this must exist because we have already peeked");
let name = match kind {
TokenKind::Ident(s) => s,
_ => return Err("Expected identifier.".into()),
};
devour_whitespace_or_comment(toks)?;
let name = eat_ident(toks, scope, super_selector)?;
devour_whitespace(toks);
devour_whitespace_or_comment(toks)?;
let mut has_include = false;
let mut args = if let Some(tok) = toks.next() {
match tok.kind {
TokenKind::Symbol(Symbol::SemiColon) => CallArgs::new(),
TokenKind::Symbol(Symbol::OpenParen) => {
';' => CallArgs::new(),
'(' => {
let tmp = eat_call_args(toks, scope, super_selector)?;
devour_whitespace(toks);
devour_whitespace_or_comment(toks)?;
if let Some(tok) = toks.next() {
match tok.kind {
TokenKind::Symbol(Symbol::SemiColon) => {}
TokenKind::Symbol(Symbol::OpenCurlyBrace) => has_include = true,
';' => {}
'{' => has_include = true,
_ => todo!(),
}
}
tmp
}
TokenKind::Symbol(Symbol::OpenCurlyBrace) => {
'{' => {
has_include = true;
CallArgs::new()
}
_ => return Err("expected \"{\".".into()),
}
} else {
return Err(SassError::new("unexpected EOF", pos));
return Err("unexpected EOF".into());
};
devour_whitespace(toks);
let content = if let Some(tok) = toks.peek() {
if tok.is_symbol(Symbol::OpenCurlyBrace) {
if tok.kind == '{' {
toks.next();
eat_stmts(toks, &mut scope.clone(), super_selector)?
} else if has_include {

164
src/atrule/mod.rs
View File

@ -3,14 +3,17 @@ use std::iter::Peekable;
use num_traits::cast::ToPrimitive;
use crate::common::{Keyword, Pos, Symbol};
use crate::common::Pos;
use crate::error::SassResult;
use crate::scope::Scope;
use crate::selector::Selector;
use crate::unit::Unit;
use crate::utils::{devour_whitespace, devour_whitespace_or_comment};
use crate::utils::{
devour_whitespace, eat_ident, read_until_closing_curly_brace, read_until_open_curly_brace,
read_until_semicolon_or_closing_curly_brace,
};
use crate::value::{Number, Value};
use crate::{Stmt, Token, TokenKind};
use crate::{Stmt, Token};
pub(crate) use function::Function;
pub(crate) use if_rule::If;
@ -51,14 +54,14 @@ impl AtRule {
Ok(match rule {
AtRuleKind::Error => {
let message = toks
.take_while(|x| x.kind != TokenKind::Symbol(Symbol::SemiColon))
.take_while(|x| x.kind != ';')
.map(|x| x.kind.to_string())
.collect::<String>();
AtRule::Error(pos, message)
}
AtRuleKind::Warn => {
let message = toks
.take_while(|x| x.kind != TokenKind::Symbol(Symbol::SemiColon))
.take_while(|x| x.kind != ';')
.map(|x| x.kind.to_string())
.collect::<String>();
devour_whitespace(toks);
@ -67,7 +70,7 @@ impl AtRule {
AtRuleKind::Debug => {
let message = toks
.by_ref()
.take_while(|x| x.kind != TokenKind::Symbol(Symbol::SemiColon))
.take_while(|x| x.kind != ';')
.map(|x| x.kind.to_string())
.collect::<String>();
devour_whitespace(toks);
@ -82,29 +85,22 @@ impl AtRule {
AtRule::Function(name, Box::new(func))
}
AtRuleKind::Return => {
let mut t = Vec::new();
let mut n = 0;
while let Some(tok) = toks.peek() {
match tok.kind {
TokenKind::Symbol(Symbol::OpenCurlyBrace) => n += 1,
TokenKind::Symbol(Symbol::CloseCurlyBrace) => n -= 1,
TokenKind::Interpolation => n += 1,
TokenKind::Symbol(Symbol::SemiColon) => break,
_ => {}
}
if n < 0 {
break;
}
t.push(toks.next().unwrap());
let v = read_until_semicolon_or_closing_curly_brace(toks);
if toks.peek().unwrap().kind == ';' {
toks.next();
}
AtRule::Return(t)
devour_whitespace(toks);
AtRule::Return(v)
}
AtRuleKind::Use => todo!("@use not yet implemented"),
AtRuleKind::Annotation => todo!("@annotation not yet implemented"),
AtRuleKind::AtRoot => todo!("@at-root not yet implemented"),
AtRuleKind::Charset => {
toks.take_while(|t| t.kind != TokenKind::Symbol(Symbol::SemiColon))
.for_each(drop);
read_until_semicolon_or_closing_curly_brace(toks);
if toks.peek().unwrap().kind == ';' {
toks.next();
}
devour_whitespace(toks);
AtRule::Charset
}
AtRuleKind::Each => todo!("@each not yet implemented"),
@ -113,38 +109,81 @@ impl AtRule {
AtRuleKind::Else => todo!("@else not yet implemented"),
AtRuleKind::For => {
let mut stmts = Vec::new();
devour_whitespace_or_comment(toks);
let var = if let Some(tok) = toks.next() {
match tok.kind {
TokenKind::Variable(s) => s,
_ => return Err("expected \"$\".".into()),
}
} else {
return Err("expected \"$\".".into());
devour_whitespace(toks);
let var = match toks.next().ok_or("expected \"$\".")?.kind {
'$' => eat_ident(toks, scope, super_selector)?,
_ => return Err("expected \"$\".".into()),
};
devour_whitespace_or_comment(toks);
if let Some(tok) = toks.next() {
match tok.kind {
TokenKind::Keyword(Keyword::From(..)) => {}
_ => return Err("Expected \"from\".".into()),
}
} else {
devour_whitespace(toks);
if toks.peek().is_none()
|| eat_ident(toks, scope, super_selector)?.to_ascii_lowercase() != "from"
{
return Err("Expected \"from\".".into());
};
devour_whitespace_or_comment(toks);
}
devour_whitespace(toks);
let mut from_toks = Vec::new();
let mut through = 0;
while let Some(tok) = toks.next() {
match tok.kind {
TokenKind::Keyword(Keyword::Through(..)) => {
through = 1;
break;
let mut these_toks = vec![tok];
match these_toks[0].kind.to_ascii_lowercase() {
't' => {
these_toks.push(toks.next().unwrap());
match these_toks[1].kind.to_ascii_lowercase() {
'h' => {
let r = toks.next().unwrap();
these_toks.push(r);
if &r.kind != &'r' {
from_toks.extend(these_toks);
continue;
}
let o = toks.next().unwrap();
these_toks.push(o);
if o.kind != 'o' {
from_toks.extend(these_toks);
continue;
}
let u = toks.next().unwrap();
these_toks.push(u);
if u.kind != 'u' {
from_toks.extend(these_toks);
continue;
}
let g = toks.next().unwrap();
these_toks.push(g);
if g.kind != 'g' {
from_toks.extend(these_toks);
continue;
}
let h = toks.next().unwrap();
these_toks.push(h);
if h.kind != 'h' {
from_toks.extend(these_toks);
continue;
}
let peek = toks.peek().unwrap().kind;
if peek.is_alphanumeric() || peek == '\\' {
from_toks.extend(these_toks);
continue;
}
through = 1;
break;
}
'o' => {
if toks.peek().unwrap().kind.is_whitespace() {
break;
} else {
from_toks.extend(these_toks);
}
}
_ => {
from_toks.extend(these_toks);
}
}
}
TokenKind::Keyword(Keyword::To(..)) => break,
TokenKind::Symbol(Symbol::OpenCurlyBrace) => {
'{' => {
return Err("Expected \"to\" or \"through\".".into());
}
_ => from_toks.push(tok),
_ => from_toks.extend(these_toks),
}
}
let from = match Value::from_tokens(
@ -158,14 +197,9 @@ impl AtRule {
},
v => return Err(format!("{} is not an integer.", v).into()),
};
devour_whitespace_or_comment(toks);
let mut to_toks = Vec::new();
while let Some(tok) = toks.next() {
match tok.kind {
TokenKind::Symbol(Symbol::OpenCurlyBrace) => break,
_ => to_toks.push(tok),
}
}
devour_whitespace(toks);
let to_toks = read_until_open_curly_brace(toks);
toks.next();
let to = match Value::from_tokens(
&mut to_toks.into_iter().peekable(),
scope,
@ -177,22 +211,12 @@ impl AtRule {
},
v => return Err(format!("{} is not an integer.", v).into()),
};
let mut body = Vec::new();
let mut n = 1;
while let Some(tok) = toks.next() {
match tok.kind {
TokenKind::Symbol(Symbol::OpenCurlyBrace) => n += 1,
TokenKind::Symbol(Symbol::CloseCurlyBrace) => n -= 1,
TokenKind::Interpolation => n += 1,
_ => {}
}
if n == 0 {
break;
}
body.push(tok);
}
let body = read_until_closing_curly_brace(toks);
// body.push(toks.next().unwrap());
toks.next();
// dbg!(&body);
devour_whitespace_or_comment(toks);
devour_whitespace(toks);
let (mut x, mut y);
let iter: &mut dyn std::iter::Iterator<Item = usize> = if from < to {

1
src/atrule/parse.rs
View File

@ -12,6 +12,7 @@ pub(crate) fn eat_stmts<I: Iterator<Item = Token>>(
) -> SassResult<Vec<Stmt>> {
let mut stmts = Vec::new();
while let Some(expr) = eat_expr(toks, scope, super_selector)? {
// dbg!(&expr);
match expr {
Expr::AtRule(a) => stmts.push(Stmt::AtRule(a)),
Expr::Style(s) => stmts.push(Stmt::Style(s)),

24
src/atrule/unknown.rs
View File

@ -1,12 +1,11 @@
use std::iter::Peekable;
use super::parse::eat_stmts;
use crate::common::Symbol;
use crate::error::SassResult;
use crate::scope::Scope;
use crate::selector::Selector;
use crate::utils::{devour_whitespace, parse_interpolation};
use crate::{RuleSet, Stmt, Token, TokenKind};
use crate::{RuleSet, Stmt, Token};
#[derive(Debug, Clone)]
pub(crate) struct UnknownAtRule {
@ -26,21 +25,26 @@ impl UnknownAtRule {
let mut params = String::new();
while let Some(tok) = toks.next() {
match tok.kind {
TokenKind::Symbol(Symbol::OpenCurlyBrace) => break,
TokenKind::Interpolation => {
params.push_str(&parse_interpolation(toks, scope, super_selector)?.to_string());
continue;
'{' => break,
'#' => {
if toks.peek().unwrap().kind == '{' {
toks.next();
params.push_str(
&parse_interpolation(toks, scope, super_selector)?.to_string(),
);
continue;
} else {
params.push(tok.kind);
}
}
TokenKind::Variable(..) => params.push('$'),
TokenKind::Whitespace(..) => {
'\n' | ' ' | '\t' => {
devour_whitespace(toks);
params.push(' ');
continue;
}
TokenKind::Error(e) => return Err(e),
_ => {}
}
params.push_str(&tok.kind.to_string());
params.push(tok.kind);
}
let raw_body = eat_stmts(toks, scope, super_selector)?;

104
src/common.rs
View File

@ -211,110 +211,6 @@ impl Display for Op {
}
}
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum Keyword {
Important,
True,
False,
Null,
Default,
Global,
From(String),
To(String),
Through(String),
// Infinity,
// NaN,
// Auto,
// Inherit,
// Initial,
// Unset,
// Not,
// And,
// Or,
// In,
}
impl Display for Keyword {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::Important => write!(f, "!important"),
Self::True => write!(f, "true"),
Self::False => write!(f, "false"),
Self::Null => write!(f, "null"),
Self::Default => write!(f, "!default"),
Self::Global => write!(f, "!global"),
Self::From(s) => write!(f, "{}", s),
Self::To(s) => write!(f, "{}", s),
Self::Through(s) => write!(f, "{}", s),
// Self::Infinity => write!(f, "Infinity"),
// Self::NaN => write!(f, "NaN"),
// Self::Auto => write!(f, "auto"),
// Self::Inherit => write!(f, "inherit"),
// Self::Initial => write!(f, "initial"),
// Self::Unset => write!(f, "unset"),
// Self::Not => write!(f, "not"),
// Self::And => write!(f, "and"),
// Self::Or => write!(f, "or"),
// Self::In => write!(f, "in"),
}
}
}
impl Into<&'static str> for Keyword {
fn into(self) -> &'static str {
match self {
Self::Important => "!important",
Self::True => "true",
Self::False => "false",
Self::Null => "null",
Self::Default => "!default",
Self::Global => "!global",
Self::From(_) => "from",
Self::To(_) => "to",
Self::Through(_) => "through",
// Self::Infinity => "Infinity",
// Self::NaN => "NaN",
// Self::Auto => "auto",
// Self::Inherit => "inherit",
// Self::Initial => "initial",
// Self::Unset => "unset",
// Self::Not => "not",
// Self::And => "and",
// Self::Or => "or",
// Self::In => "in",
}
}
}
impl TryFrom<&str> for Keyword {
type Error = &'static str;
fn try_from(kw: &str) -> Result<Self, Self::Error> {
match kw.to_ascii_lowercase().as_str() {
"important" => Ok(Self::Important),
"true" => Ok(Self::True),
"false" => Ok(Self::False),
"null" => Ok(Self::Null),
"default" => Ok(Self::Default),
"global" => Ok(Self::Global),
"from" => Ok(Self::From(kw.to_owned())),
"to" => Ok(Self::To(kw.to_owned())),
"through" => Ok(Self::Through(kw.to_owned())),
// "infinity" => Ok(Self::Infinity),
// "nan" => Ok(Self::NaN),
// "auto" => Ok(Self::Auto),
// "inherit" => Ok(Self::Inherit),
// "initial" => Ok(Self::Initial),
// "unset" => Ok(Self::Unset),
// "not" => Ok(Self::Not),
// "and" => Ok(Self::And),
// "or" => Ok(Self::Or),
// "in" => Ok(Self::In),
_ => Err("invalid keyword"),
}
}
}
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub struct Pos {
line: u32,

290
src/lexer.rs
View File

@ -1,156 +1,44 @@
use std::convert::TryFrom;
use std::iter::Peekable;
use std::str::Chars;
use std::sync::atomic::{AtomicBool, Ordering};
use crate::atrule::AtRuleKind;
use crate::common::{Keyword, Op, Pos, Symbol};
use crate::{Token, TokenKind, Whitespace};
// Rust does not allow us to escape '\f'
const FORM_FEED: char = '\x0C';
use crate::common::Pos;
use crate::Token;
pub static IS_UTF8: AtomicBool = AtomicBool::new(false);
pub const FORM_FEED: char = '\x0C';
#[derive(Debug, Clone)]
pub(crate) struct Lexer<'a> {
tokens: Vec<Token>,
buf: Peekable<Chars<'a>>,
pos: Pos,
should_emit_backslash: usize,
}
impl<'a> Iterator for Lexer<'a> {
type Item = Token;
fn next(&mut self) -> Option<Self::Item> {
macro_rules! symbol {
($self:ident, $symbol:ident) => {{
$self.buf.next();
$self.pos.next_char();
TokenKind::Symbol(Symbol::$symbol)
}};
}
macro_rules! whitespace {
($self:ident, $whitespace:ident) => {{
$self.buf.next();
$self.pos.next_char();
TokenKind::Whitespace(Whitespace::$whitespace)
}};
}
if self.should_emit_backslash > 0 {
self.should_emit_backslash -= 1;
return Some(Token {
kind: TokenKind::Symbol(Symbol::BackSlash),
pos: self.pos,
});
}
let kind: TokenKind = match self.buf.peek().unwrap_or(&'\0') {
'a'..='z' | 'A'..='Z' | '_' => self.lex_ident(),
'-' => {
self.buf.next();
self.pos.next_char();
match self.buf.peek().unwrap() {
'0'..='9' | '.' => match self.lex_num() {
TokenKind::Number(n) => {
let mut s = String::from("-");
s.push_str(&n);
TokenKind::Number(s)
}
e @ TokenKind::Error(..) => e,
_ => unsafe { std::hint::unreachable_unchecked() },
},
'a'..='z' | 'A'..='Z' | '_' | '-' => match self.lex_ident() {
TokenKind::Ident(i) => {
let mut s = String::from("-");
s.push_str(&i);
TokenKind::Ident(s)
}
TokenKind::Keyword(kw) => {
let mut s = String::from("-");
s.push_str(&kw.to_string());
TokenKind::Ident(s)
}
TokenKind::Symbol(Symbol::Minus) => TokenKind::Ident(String::from("--")),
e @ TokenKind::Error(..) => e,
_ => unsafe { std::hint::unreachable_unchecked() },
},
_ => TokenKind::Symbol(Symbol::Minus),
}
}
'@' => self.lex_at_rule(),
'0'..='9' => self.lex_num(),
'.' => {
self.buf.next();
self.pos.next_char();
match self.buf.peek().unwrap() {
'0'..='9' => match self.lex_num() {
TokenKind::Number(n) => {
let mut s = String::from("0.");
s.push_str(&n);
TokenKind::Number(s)
}
e @ TokenKind::Error(..) => e,
_ => unsafe { std::hint::unreachable_unchecked() },
},
_ => TokenKind::Symbol(Symbol::Period),
}
}
'$' => self.lex_variable(),
':' => symbol!(self, Colon),
',' => symbol!(self, Comma),
';' => symbol!(self, SemiColon),
'(' => symbol!(self, OpenParen),
')' => symbol!(self, CloseParen),
'+' => symbol!(self, Plus),
'=' => {
self.buf.next();
self.pos.next_char();
match self.buf.peek() {
Some('=') => {
self.buf.next();
self.pos.next_char();
TokenKind::Op(Op::Equal)
}
_ => TokenKind::Symbol(Symbol::Equal),
}
}
'?' => symbol!(self, QuestionMark),
'\\' => self.lex_back_slash().0,
'~' => symbol!(self, Tilde),
'\'' => symbol!(self, SingleQuote),
'"' => symbol!(self, DoubleQuote),
' ' => whitespace!(self, Space),
'\t' => whitespace!(self, Tab),
'\n' | &FORM_FEED => {
self.buf.next();
let kind = match self.buf.next()? {
'\n' | FORM_FEED => {
self.pos.newline();
TokenKind::Whitespace(Whitespace::Newline)
'\n'
}
'\r' => {
self.buf.next();
TokenKind::Whitespace(Whitespace::Newline)
if self.buf.peek() == Some(&'\n') {
self.buf.next();
'\n'
} else {
'\n'
}
}
'#' => self.lex_hash(),
'{' => symbol!(self, OpenCurlyBrace),
'*' => symbol!(self, Mul),
'}' => symbol!(self, CloseCurlyBrace),
'&' => symbol!(self, BitAnd),
'|' => symbol!(self, BitOr),
'/' => self.lex_forward_slash(),
'%' => symbol!(self, Percent),
'[' => symbol!(self, OpenSquareBrace),
']' => symbol!(self, CloseSquareBrace),
'!' => self.lex_exclamation(),
'<' => symbol!(self, Lt),
'>' => symbol!(self, Gt),
'^' => symbol!(self, Xor),
'`' => symbol!(self, BackTick),
'\0' => return None,
c if c.is_control() => {
self.buf.next();
TokenKind::Error("Expected expression.".into())
// c if c.is_control() => {
// return Some(Err("Expected expression.".into()))
// }
c if !c.is_ascii() => {
IS_UTF8.store(true, Ordering::Relaxed);
c
}
_ => self.lex_ident(),
c => c,
};
self.pos.next_char();
Some(Token {
@ -163,13 +51,11 @@ impl<'a> Iterator for Lexer<'a> {
impl<'a> Lexer<'a> {
pub fn new(buf: &'a str) -> Lexer<'a> {
Lexer {
tokens: Vec::with_capacity(buf.len()),
buf: buf.chars().peekable(),
pos: Pos::new(),
should_emit_backslash: 0,
}
}
/*
fn lex_exclamation(&mut self) -> TokenKind {
self.buf.next();
self.pos.next_char();
@ -204,19 +90,6 @@ impl<'a> Lexer<'a> {
}
}
fn lex_at_rule(&mut self) -> TokenKind {
self.buf.next();
self.pos.next_char();
if let TokenKind::Ident(s) = self.lex_ident() {
if s.is_empty() {
TokenKind::Error("Expected identifier.".into())
} else {
TokenKind::AtRule(AtRuleKind::from(s.as_ref()))
}
} else {
TokenKind::Error("Expected identifier.".into())
}
}
fn lex_back_slash(&mut self) -> (TokenKind, bool) {
self.buf.next();
@ -254,95 +127,6 @@ impl<'a> Lexer<'a> {
}
}
fn devour_whitespace(&mut self) {
while let Some(c) = self.buf.peek() {
if c.is_ascii_whitespace() {
self.buf.next();
self.pos.next_char();
continue;
}
break;
}
}
fn lex_forward_slash(&mut self) -> TokenKind {
self.buf.next();
self.pos.next_char();
match self.buf.peek().expect("expected something after '/'") {
'/' => {
self.buf.by_ref().take_while(|x| x != &'\n').for_each(drop);
self.pos.newline();
}
'*' => {
self.buf.next();
self.pos.next_char();
let mut comment = String::new();
while let Some(tok) = self.buf.next() {
match tok {
'\n' => self.pos.newline(),
FORM_FEED => {
self.pos.newline();
comment.push('\n');
continue;
}
'\r' => {
if self.buf.peek() == Some(&'\n') {
self.buf.next();
}
self.pos.newline();
comment.push('\n');
continue;
}
'*' if self.buf.peek() == Some(&'/') => {
self.buf.next();
break;
}
_ => self.pos.next_char(),
}
comment.push(tok);
}
return TokenKind::MultilineComment(comment);
}
_ => return TokenKind::Symbol(Symbol::Div),
}
TokenKind::Whitespace(Whitespace::Newline)
}
fn lex_num(&mut self) -> TokenKind {
let mut whole = String::new();
while let Some(c) = self.buf.peek() {
if !c.is_numeric() {
break;
}
let tok = self.buf.next().unwrap();
self.pos.next_char();
whole.push(tok);
}
let mut dec = String::new();
if self.buf.peek() == Some(&'.') {
self.buf.next();
dec.push('.');
while let Some(c) = self.buf.peek() {
if !c.is_numeric() {
break;
}
let tok = self.buf.next().unwrap();
self.pos.next_char();
dec.push(tok);
}
}
if dec.len() == 1 {
return TokenKind::Error("Expected digit.".into());
}
whole.push_str(&dec);
TokenKind::Number(whole)
}
fn lex_hash(&mut self) -> TokenKind {
self.buf.next();
self.pos.next_char();
@ -354,39 +138,6 @@ impl<'a> Lexer<'a> {
TokenKind::Symbol(Symbol::Hash)
}
fn lex_variable(&mut self) -> TokenKind {
self.buf.next();
self.pos.next_char();
let mut name = String::with_capacity(99);
if let Some(c) = self.buf.peek() {
if c == &'=' {
return TokenKind::Symbol(Symbol::Dollar);
} else if !c.is_alphabetic() && c != &'-' && c != &'_' {
return TokenKind::Error("Expected identifier.".into());
} else {
self.pos.next_char();
name.push(*c);
}
self.buf.next();
}
while let Some(c) = self.buf.peek() {
if !c.is_alphanumeric() && c != &'-' && c != &'_' {
break;
}
let tok = self
.buf
.next()
.expect("this is impossible because we have already peeked");
self.pos.next_char();
name.push(tok);
}
if name.is_empty() {
TokenKind::Symbol(Symbol::Dollar)
} else {
TokenKind::Variable(name)
}
}
fn lex_ident(&mut self) -> TokenKind {
let mut string = String::with_capacity(99);
while let Some(c) = self.buf.peek() {
@ -429,4 +180,5 @@ impl<'a> Lexer<'a> {
TokenKind::Ident(string)
}
*/
}

345
src/lib.rs
View File

@ -85,18 +85,20 @@ use std::iter::{Iterator, Peekable};
use std::path::Path;
use crate::atrule::{eat_include, AtRule, AtRuleKind, Function, Mixin};
use crate::common::{Pos, Symbol, Whitespace};
use crate::common::Pos;
use crate::css::Css;
use crate::error::SassError;
pub use crate::error::SassResult;
pub use crate::error::{SassError, SassResult};
use crate::format::PrettyPrinter;
use crate::imports::import;
use crate::lexer::Lexer;
use crate::scope::{insert_global_var, Scope, GLOBAL_SCOPE};
use crate::selector::Selector;
use crate::style::Style;
pub(crate) use crate::token::{Token, TokenKind};
use crate::utils::{devour_whitespace, eat_variable_value, VariableDecl};
pub(crate) use crate::token::Token;
use crate::utils::{
devour_whitespace, eat_comment, eat_ident, eat_variable_value, parse_quoted_string,
read_until_newline, VariableDecl,
};
use crate::value::Value;
mod args;
@ -280,37 +282,25 @@ impl<'a> StyleSheetParser<'a> {
let mut rules: Vec<Stmt> = Vec::new();
while let Some(Token { kind, .. }) = self.lexer.peek() {
match kind {
TokenKind::Ident(_)
| TokenKind::Interpolation
| TokenKind::Symbol(Symbol::OpenSquareBrace)
| TokenKind::Symbol(Symbol::Hash)
| TokenKind::Symbol(Symbol::Colon)
| TokenKind::Symbol(Symbol::Mul)
| TokenKind::Symbol(Symbol::Percent)
| TokenKind::Symbol(Symbol::Period) => rules
'a'..='z' | 'A'..='Z' | '_' | '-'
| '[' | '#' | ':' | '*' | '%' | '.' => rules
.extend(self.eat_rules(&Selector::new(), &mut GLOBAL_SCOPE.with(|s| s.borrow().clone()))?),
TokenKind::Whitespace(_) => {
&'\t' | &'\n' | ' ' => {
self.lexer.next();
continue;
}
TokenKind::Variable(_) => {
let Token { pos, kind } = self
.lexer
.next()
.expect("this must exist because we have already peeked");
let name = match kind {
TokenKind::Variable(n) => n,
_ => unsafe { std::hint::unreachable_unchecked() },
};
'$' => {
self.lexer.next();
let name = eat_ident(&mut self.lexer, &Scope::new(), &Selector::new())?;
devour_whitespace(&mut self.lexer);
if self
.lexer
.next()
.unwrap_or_else(|| self.error(pos, "expected value after variable"))
.unwrap()
.kind
!= TokenKind::Symbol(Symbol::Colon)
!= ':'
{
self.error(pos, "unexpected variable use at toplevel");
return Err("expected \":\".".into());
}
let VariableDecl { val, default, .. } =
eat_variable_value(&mut self.lexer, &GLOBAL_SCOPE.with(|s| s.borrow().clone()), &Selector::new())?;
@ -325,111 +315,92 @@ impl<'a> StyleSheetParser<'a> {
}
})?
}
TokenKind::MultilineComment(_) => {
let comment = match self
.lexer
.next()
.expect("this must exist because we have already peeked")
.kind
{
TokenKind::MultilineComment(c) => c,
_ => unsafe { std::hint::unreachable_unchecked() },
};
rules.push(Stmt::MultilineComment(comment));
'/' => {
self.lexer.next();
if '*' == self.lexer.peek().unwrap().kind {
self.lexer.next();
rules.push(Stmt::MultilineComment(eat_comment(&mut self.lexer, &Scope::new(), &Selector::new())?));
} else if '/' == self.lexer.peek().unwrap().kind {
read_until_newline(&mut self.lexer);
devour_whitespace(&mut self.lexer);
} else {
todo!()
}
}
TokenKind::AtRule(AtRuleKind::Include) => rules.extend(eat_include(
&mut self.lexer,
&GLOBAL_SCOPE.with(|s| s.borrow().clone()),
&Selector::new(),
)?),
TokenKind::AtRule(AtRuleKind::Import) => {
let Token { pos, .. } = self
.lexer
.next()
.expect("this must exist because we have already peeked");
devour_whitespace(&mut self.lexer);
let mut file_name = String::new();
match self
.lexer
.next()
.unwrap_or_else(|| self.error(pos, "expected value after @import"))
.kind
{
TokenKind::Symbol(Symbol::DoubleQuote) => {
while let Some(tok) = self.lexer.next() {
if tok.kind == TokenKind::Symbol(Symbol::DoubleQuote) {
break;
}
file_name.push_str(&tok.kind.to_string());
}
}
TokenKind::Symbol(Symbol::SingleQuote) => {
while let Some(tok) = self.lexer.next() {
if tok.kind == TokenKind::Symbol(Symbol::SingleQuote) {
break;
}
file_name.push_str(&tok.kind.to_string());
}
}
_ => todo!("expected ' or \" after @import"),
}
let Token { kind, pos } = self
.lexer
.next()
.expect("this must exist because we have already peeked");
if kind != TokenKind::Symbol(Symbol::SemiColon) {
self.error(pos, "expected `;` after @import declaration");
'@' => {
self.lexer.next();
let at_rule_kind = eat_ident(&mut self.lexer, &Scope::new(), &Selector::new())?;
if at_rule_kind.is_empty() {
return Err("Expected identifier.".into());
}
match AtRuleKind::from(at_rule_kind.as_str()) {
AtRuleKind::Include => rules.extend(eat_include(
&mut self.lexer,
&GLOBAL_SCOPE.with(|s| s.borrow().clone()),
&Selector::new(),
)?),
AtRuleKind::Import => {
devour_whitespace(&mut self.lexer);
let mut file_name = String::new();
match self
.lexer
.next()
.unwrap()
.kind
{
q @ '"' | q @ '\'' => {
file_name.push_str(&parse_quoted_string(&mut self.lexer, &Scope::new(), q, &Selector::new())?.unquote().to_string());
}
_ => todo!("expected ' or \" after @import"),
}
if self.lexer.next().unwrap().kind != ';' {
todo!("no semicolon after @import");
}
let (new_rules, new_scope) = import(file_name)?;
rules.extend(new_rules);
GLOBAL_SCOPE.with(|s| {
s.borrow_mut().extend(new_scope);
});
}
TokenKind::AtRule(_) => {
if let Some(Token {
kind: TokenKind::AtRule(ref rule),
pos,
}) = self.lexer.next()
{
match AtRule::from_tokens(rule, pos, &mut self.lexer, &mut GLOBAL_SCOPE.with(|s| s.borrow().clone()), &Selector::new())? {
AtRule::Mixin(name, mixin) => {
GLOBAL_SCOPE.with(|s| {
s.borrow_mut().insert_mixin(&name, *mixin);
});
}
AtRule::Function(name, func) => {
GLOBAL_SCOPE.with(|s| {
s.borrow_mut().insert_fn(&name, *func);
});
}
AtRule::Charset => continue,
AtRule::Error(pos, message) => self.error(pos, &message),
AtRule::Warn(pos, message) => self.warn(pos, &message),
AtRule::Debug(pos, message) => self.debug(pos, &message),
AtRule::Return(_) => {
return Err("This at-rule is not allowed here.".into())
}
AtRule::For(s) => rules.extend(s),
AtRule::Content => return Err("@content is only allowed within mixin declarations.".into()),
AtRule::If(i) => {
rules.extend(i.eval(&mut Scope::new(), &Selector::new())?);
}
u @ AtRule::Unknown(..) => rules.push(Stmt::AtRule(u)),
let (new_rules, new_scope) = import(file_name)?;
rules.extend(new_rules);
GLOBAL_SCOPE.with(|s| {
s.borrow_mut().extend(new_scope);
});
}
v => {
match AtRule::from_tokens(&v, Pos::new(), &mut self.lexer, &mut GLOBAL_SCOPE.with(|s| s.borrow().clone()), &Selector::new())? {
AtRule::Mixin(name, mixin) => {
GLOBAL_SCOPE.with(|s| {
s.borrow_mut().insert_mixin(&name, *mixin);
});
}
AtRule::Function(name, func) => {
GLOBAL_SCOPE.with(|s| {
s.borrow_mut().insert_fn(&name, *func);
});
}
AtRule::Charset => continue,
AtRule::Error(pos, message) => self.error(pos, &message),
AtRule::Warn(pos, message) => self.warn(pos, &message),
AtRule::Debug(pos, message) => self.debug(pos, &message),
AtRule::Return(_) => {
return Err("This at-rule is not allowed here.".into())
}
AtRule::For(s) => rules.extend(s),
AtRule::Content => return Err("@content is only allowed within mixin declarations.".into()),
AtRule::If(i) => {
rules.extend(i.eval(&mut Scope::new(), &Selector::new())?);
}
u @ AtRule::Unknown(..) => rules.push(Stmt::AtRule(u)),
}
}
}
}
TokenKind::Symbol(Symbol::BitAnd) => {
},
'&' => {
return Err(
"Base-level rules cannot contain the parent-selector-referencing character '&'.".into(),
)
}
TokenKind::Error(e) => return Err(e.clone()),
_ => match dbg!(self.lexer.next()) {
Some(Token { pos, .. }) => self.error(pos, "unexpected toplevel token"),
_ => unsafe { std::hint::unreachable_unchecked() },
},
}
};
}
Ok((rules, GLOBAL_SCOPE.with(|s| s.borrow().clone())))
@ -495,7 +466,7 @@ pub(crate) fn eat_expr<I: Iterator<Item = Token>>(
let mut values = Vec::with_capacity(5);
while let Some(tok) = toks.peek() {
match &tok.kind {
TokenKind::Symbol(Symbol::Colon) => {
':' => {
let tok = toks.next();
if devour_whitespace(toks) {
let prop = Style::parse_property(
@ -509,7 +480,7 @@ pub(crate) fn eat_expr<I: Iterator<Item = Token>>(
values.push(tok.unwrap());
}
}
TokenKind::Symbol(Symbol::SemiColon) => {
';' => {
toks.next();
devour_whitespace(toks);
// special edge case where there was no space between the colon
@ -517,6 +488,7 @@ pub(crate) fn eat_expr<I: Iterator<Item = Token>>(
let mut v = values.into_iter().peekable();
devour_whitespace(&mut v);
if v.peek().is_none() {
devour_whitespace(toks);
return Ok(Some(Expr::Style(Box::new(Style {
property: String::new(),
value: Value::Null,
@ -526,7 +498,7 @@ pub(crate) fn eat_expr<I: Iterator<Item = Token>>(
let value = Style::parse_value(&mut v, scope, super_selector)?;
return Ok(Some(Expr::Style(Box::new(Style { property, value }))));
}
TokenKind::Symbol(Symbol::CloseCurlyBrace) => {
'}' => {
if values.is_empty() {
toks.next();
devour_whitespace(toks);
@ -542,7 +514,7 @@ pub(crate) fn eat_expr<I: Iterator<Item = Token>>(
return Ok(Some(Expr::Style(Box::new(Style { property, value }))));
}
}
TokenKind::Symbol(Symbol::OpenCurlyBrace) => {
'{' => {
toks.next();
devour_whitespace(toks);
return Ok(Some(Expr::Selector(Selector::from_tokens(
@ -551,18 +523,15 @@ pub(crate) fn eat_expr<I: Iterator<Item = Token>>(
super_selector,
)?)));
}
TokenKind::Variable(_) => {
let tok = toks
.next()
.expect("this must exist because we have already peeked");
let pos = tok.pos();
let name = match tok.kind {
TokenKind::Variable(n) => n,
_ => unsafe { std::hint::unreachable_unchecked() },
};
if let TokenKind::Symbol(Symbol::Colon) =
toks.peek().expect("expected something after variable").kind
{
'$' => {
let tok = toks.next().unwrap();
if toks.peek().unwrap().kind == '=' {
values.push(tok);
values.push(toks.next().unwrap());
continue;
}
let name = eat_ident(toks, scope, super_selector)?;
if toks.peek().unwrap().kind == ':' {
toks.next();
devour_whitespace(toks);
let VariableDecl {
@ -577,60 +546,67 @@ pub(crate) fn eat_expr<I: Iterator<Item = Token>>(
return Ok(Some(Expr::VariableDecl(name, Box::new(val))));
}
} else {
values.push(Token {
kind: TokenKind::Variable(name),
pos,
});
todo!()
}
}
TokenKind::MultilineComment(_) => {
let tok = toks
.next()
.expect("this must exist because we have already peeked");
devour_whitespace(toks);
if values.is_empty() {
let s = match tok.kind {
TokenKind::MultilineComment(s) => s,
_ => unsafe { std::hint::unreachable_unchecked() },
};
return Ok(Some(Expr::MultilineComment(s)));
'/' => {
let tok = toks.next().unwrap();
let peeked = toks.peek().ok_or("expected more input.")?;
if peeked.kind == '/' {
read_until_newline(toks);
devour_whitespace(toks);
continue;
} else if values.is_empty() && peeked.kind == '*' {
toks.next();
return Ok(Some(Expr::MultilineComment(eat_comment(
toks,
scope,
super_selector,
)?)));
} else {
values.push(tok);
}
}
TokenKind::AtRule(AtRuleKind::Include) => {
return Ok(Some(Expr::Include(eat_include(
toks,
scope,
super_selector,
)?)));
}
TokenKind::AtRule(_) => {
if let Some(Token {
kind: TokenKind::AtRule(ref rule),
pos,
}) = toks.next()
{
return match AtRule::from_tokens(rule, pos, toks, scope, super_selector)? {
AtRule::Mixin(name, mixin) => Ok(Some(Expr::MixinDecl(name, mixin))),
AtRule::Function(name, func) => Ok(Some(Expr::FunctionDecl(name, func))),
AtRule::Charset => todo!("@charset as expr"),
AtRule::Debug(a, b) => Ok(Some(Expr::Debug(a, b))),
AtRule::Warn(a, b) => Ok(Some(Expr::Warn(a, b))),
AtRule::Error(pos, err) => Err(SassError::new(err, pos)),
a @ AtRule::Return(_) => Ok(Some(Expr::AtRule(a))),
c @ AtRule::Content => Ok(Some(Expr::AtRule(c))),
f @ AtRule::If(..) => Ok(Some(Expr::AtRule(f))),
f @ AtRule::For(..) => Ok(Some(Expr::AtRule(f))),
u @ AtRule::Unknown(..) => Ok(Some(Expr::AtRule(u))),
};
'@' => {
let pos = toks.next().unwrap().pos();
match AtRuleKind::from(eat_ident(toks, scope, super_selector)?.as_str()) {
AtRuleKind::Include => {
devour_whitespace(toks);
return Ok(Some(Expr::Include(eat_include(
toks,
scope,
super_selector,
)?)));
}
v => {
devour_whitespace(toks);
return match AtRule::from_tokens(&v, pos, toks, scope, super_selector)? {
AtRule::Mixin(name, mixin) => Ok(Some(Expr::MixinDecl(name, mixin))),
AtRule::Function(name, func) => {
Ok(Some(Expr::FunctionDecl(name, func)))
}
AtRule::Charset => todo!("@charset as expr"),
AtRule::Debug(a, b) => Ok(Some(Expr::Debug(a, b))),
AtRule::Warn(a, b) => Ok(Some(Expr::Warn(a, b))),
AtRule::Error(pos, err) => Err(SassError::new(err, pos)),
a @ AtRule::Return(_) => Ok(Some(Expr::AtRule(a))),
c @ AtRule::Content => Ok(Some(Expr::AtRule(c))),
f @ AtRule::If(..) => Ok(Some(Expr::AtRule(f))),
f @ AtRule::For(..) => Ok(Some(Expr::AtRule(f))),
u @ AtRule::Unknown(..) => Ok(Some(Expr::AtRule(u))),
};
}
}
}
TokenKind::Interpolation => values.extend(eat_interpolation(toks)),
_ => match toks.next() {
Some(tok) => values.push(tok),
_ => unsafe { std::hint::unreachable_unchecked() },
},
'#' => {
values.push(toks.next().unwrap());
let next = toks.next().unwrap();
values.push(next);
if next.kind == '{' {
values.extend(eat_interpolation(toks));
}
}
_ => values.push(toks.next().unwrap()),
};
}
Ok(None)
@ -638,12 +614,11 @@ pub(crate) fn eat_expr<I: Iterator<Item = Token>>(
fn eat_interpolation<I: Iterator<Item = Token>>(toks: &mut Peekable<I>) -> Vec<Token> {
let mut vals = Vec::new();
let mut n = 0;
let mut n = 1;
for tok in toks {
match tok.kind {
TokenKind::Symbol(Symbol::OpenCurlyBrace) => n += 1,
TokenKind::Symbol(Symbol::CloseCurlyBrace) => n -= 1,
TokenKind::Interpolation => n += 1,
'{' => n += 1,
'}' => n -= 1,
_ => {}
}
vals.push(tok);

163
src/selector.rs
View File

@ -2,15 +2,14 @@ use std::fmt::{self, Display, Write};
use std::iter::Peekable;
use std::string::ToString;
use crate::common::{Symbol, Whitespace};
use crate::error::SassResult;
use crate::lexer::Lexer;
use crate::scope::Scope;
use crate::utils::{
devour_whitespace, devour_whitespace_or_comment, flatten_ident, parse_interpolation,
parse_quoted_string, IsWhitespace,
devour_whitespace, devour_whitespace_or_comment, eat_ident, eat_ident_no_interpolation,
parse_interpolation, parse_quoted_string, IsWhitespace,
};
use crate::{Token, TokenKind};
use crate::Token;
#[derive(Clone, Debug, Eq, PartialEq)]
pub(crate) struct Selector(pub Vec<SelectorKind>);
@ -198,17 +197,18 @@ impl<'a> SelectorParser<'a> {
) -> SassResult<()> {
if let Some(tok) = tokens.next() {
match tok.kind {
TokenKind::Ident(s) => {
if let Some(Token {
kind: TokenKind::Symbol(Symbol::OpenParen),
..
}) = tokens.peek()
{
v @ 'a'..='z' | v @ 'A'..='Z' | v @ '-' | v @ '_' => {
let s = format!(
"{}{}",
v,
eat_ident(tokens, &self.scope, &self.super_selector)?
);
if let Some(Token { kind: '(', .. }) = tokens.peek() {
tokens.next();
devour_whitespace_or_comment(tokens);
devour_whitespace(tokens);
let mut toks = String::new();
while let Some(Token { kind, .. }) = tokens.peek() {
if kind == &TokenKind::Symbol(Symbol::CloseParen) {
if kind == &')' {
tokens.next();
break;
}
@ -224,14 +224,9 @@ impl<'a> SelectorParser<'a> {
self.selectors.push(SelectorKind::Pseudo(s))
}
}
TokenKind::Symbol(Symbol::Colon) => {
if let Some(Token {
kind: TokenKind::Ident(s),
..
}) = tokens.next()
{
self.selectors.push(SelectorKind::PseudoElement(s))
}
':' => {
let s = eat_ident(tokens, &self.scope, &self.super_selector)?;
self.selectors.push(SelectorKind::PseudoElement(s))
}
_ => return Err("Expected identifier.".into()),
}
@ -253,12 +248,8 @@ impl<'a> SelectorParser<'a> {
&mut self,
tokens: &'_ mut Peekable<I>,
) -> SassResult<()> {
if devour_whitespace_or_comment(tokens) {
if let Some(Token {
kind: TokenKind::Symbol(Symbol::Comma),
..
}) = tokens.peek()
{
if devour_whitespace_or_comment(tokens)? {
if let Some(Token { kind: ',', .. }) = tokens.peek() {
tokens.next();
self.selectors.push(SelectorKind::Multiple);
return Ok(());
@ -268,49 +259,50 @@ impl<'a> SelectorParser<'a> {
}
if let Some(Token { kind, .. }) = tokens.next() {
match kind {
TokenKind::Ident(v) | TokenKind::Number(v) => {
self.selectors.push(SelectorKind::Element(v))
v @ 'a'..='z' | v @ 'A'..='Z' | v @ '-' | v @ '_' => {
let s = format!("{}{}", v, eat_ident_no_interpolation(tokens)?);
self.selectors.push(SelectorKind::Element(s))
}
TokenKind::Symbol(Symbol::Period) => self.selectors.push(SelectorKind::Class),
TokenKind::Symbol(Symbol::Hash) => self.selectors.push(SelectorKind::Id),
TokenKind::Symbol(Symbol::Colon) => self.consume_pseudo_selector(tokens)?,
TokenKind::Symbol(Symbol::Comma) => {
'.' => self.selectors.push(SelectorKind::Class),
'#' => {
if tokens.peek().unwrap().kind == '{' {
tokens.next();
self.is_interpolated = true;
self.tokens_to_selectors(
&mut Lexer::new(
&parse_interpolation(tokens, self.scope, self.super_selector)?
.to_string(),
)
.peekable(),
)?;
self.is_interpolated = false;
} else {
self.selectors.push(SelectorKind::Id)
}
}
':' => self.consume_pseudo_selector(tokens)?,
',' => {
self.selectors.push(SelectorKind::Multiple);
if tokens.peek().unwrap().kind == TokenKind::Whitespace(Whitespace::Newline) {
if tokens.peek().unwrap().kind == '\n' {
self.selectors.push(SelectorKind::Newline);
devour_whitespace(tokens);
}
}
TokenKind::Symbol(Symbol::Gt) => self.selectors.push(SelectorKind::ImmediateChild),
TokenKind::Symbol(Symbol::Plus) => self.selectors.push(SelectorKind::Following),
TokenKind::Symbol(Symbol::Tilde) => self.selectors.push(SelectorKind::Preceding),
TokenKind::Symbol(Symbol::Mul) => self.selectors.push(SelectorKind::Universal),
TokenKind::Symbol(Symbol::Percent) => {
self.selectors.push(SelectorKind::Placeholder)
}
TokenKind::Symbol(Symbol::BitAnd) => self.selectors.push(if self.is_interpolated {
'>' => self.selectors.push(SelectorKind::ImmediateChild),
'+' => self.selectors.push(SelectorKind::Following),
'~' => self.selectors.push(SelectorKind::Preceding),
'*' => self.selectors.push(SelectorKind::Universal),
'%' => self.selectors.push(SelectorKind::Placeholder),
'&' => self.selectors.push(if self.is_interpolated {
SelectorKind::InterpolatedSuper
} else {
SelectorKind::Super
}),
TokenKind::Interpolation => {
self.is_interpolated = true;
self.tokens_to_selectors(
&mut Lexer::new(
&parse_interpolation(
tokens,
self.scope,
&Selector(vec![SelectorKind::Element(String::from("&"))]),
)?
.to_string(),
)
.peekable(),
)?;
self.is_interpolated = false;
}
TokenKind::Symbol(Symbol::OpenSquareBrace) => self.selectors.push(
Attribute::from_tokens(tokens, self.scope, self.super_selector)?,
),
'[' => self.selectors.push(Attribute::from_tokens(
tokens,
self.scope,
self.super_selector,
)?),
_ => todo!("unimplemented selector"),
};
}
@ -418,16 +410,14 @@ impl Attribute {
devour_whitespace(toks);
let attr = if let Some(t) = toks.next() {
match t.kind {
TokenKind::Ident(mut s) => {
s.push_str(&flatten_ident(toks, scope, super_selector)?);
s
v @ 'a'..='z' | v @ 'A'..='Z' | v @ '-' | v @ '_' => {
format!("{}{}", v, eat_ident(toks, scope, super_selector)?)
}
TokenKind::Interpolation => {
'#' if toks.next().unwrap().kind == '{' => {
parse_interpolation(toks, scope, super_selector)?.to_string()
}
q @ TokenKind::Symbol(Symbol::DoubleQuote)
| q @ TokenKind::Symbol(Symbol::SingleQuote) => {
parse_quoted_string(toks, scope, &q, super_selector)?.to_string()
q @ '"' | q @ '\'' => {
parse_quoted_string(toks, scope, q, super_selector)?.to_string()
}
_ => return Err("Expected identifier.".into()),
}
@ -439,20 +429,19 @@ impl Attribute {
let kind = if let Some(t) = toks.next() {
match t.kind {
TokenKind::Ident(s) if s.len() == 1 => {
devour_whitespace(toks);
v @ 'a'..='z' | v @ 'A'..='Z' => {
match toks.next().unwrap().kind {
TokenKind::Symbol(Symbol::CloseSquareBrace) => {}
']' => {}
_ => return Err("expected \"]\".".into()),
}
return Ok(SelectorKind::Attribute(Attribute {
kind: AttributeKind::Any,
attr,
value: String::new(),
modifier: s,
modifier: v.to_string(),
}));
}
TokenKind::Symbol(Symbol::CloseSquareBrace) => {
']' => {
return Ok(SelectorKind::Attribute(Attribute {
kind: AttributeKind::Any,
attr,
@ -460,12 +449,12 @@ impl Attribute {
modifier: String::new(),
}));
}
TokenKind::Symbol(Symbol::Equal) => AttributeKind::Equals,
TokenKind::Symbol(Symbol::Tilde) => AttributeKind::InList,
TokenKind::Symbol(Symbol::BitOr) => AttributeKind::BeginsWithHyphenOrExact,
TokenKind::Symbol(Symbol::Xor) => AttributeKind::StartsWith,
TokenKind::Symbol(Symbol::Dollar) => AttributeKind::EndsWith,
TokenKind::Symbol(Symbol::Mul) => AttributeKind::Contains,
'=' => AttributeKind::Equals,
'~' => AttributeKind::InList,
'|' => AttributeKind::BeginsWithHyphenOrExact,
'^' => AttributeKind::StartsWith,
'$' => AttributeKind::EndsWith,
'*' => AttributeKind::Contains,
_ => return Err("Expected \"]\".".into()),
}
} else {
@ -474,7 +463,7 @@ impl Attribute {
if kind != AttributeKind::Equals {
match toks.next().unwrap().kind {
TokenKind::Symbol(Symbol::Equal) => {}
'=' => {}
_ => return Err("expected \"=\".".into()),
}
}
@ -483,13 +472,11 @@ impl Attribute {
let value = if let Some(t) = toks.next() {
match t.kind {
TokenKind::Ident(mut s) => {
s.push_str(&flatten_ident(toks, scope, super_selector)?);
s
v @ 'a'..='z' | v @ 'A'..='Z' | v @ '-' | v @ '_' => {
format!("{}{}", v, eat_ident(toks, scope, super_selector)?)
}
q @ TokenKind::Symbol(Symbol::DoubleQuote)
| q @ TokenKind::Symbol(Symbol::SingleQuote) => {
parse_quoted_string(toks, scope, &q, super_selector)?.to_string()
q @ '"' | q @ '\'' => {
parse_quoted_string(toks, scope, q, super_selector)?.to_string()
}
_ => return Err("Expected identifier.".into()),
}
@ -501,7 +488,7 @@ impl Attribute {
let modifier = if let Some(t) = toks.next() {
match t.kind {
TokenKind::Symbol(Symbol::CloseSquareBrace) => {
']' => {
return Ok(SelectorKind::Attribute(Attribute {
kind,
attr,
@ -509,12 +496,12 @@ impl Attribute {
modifier: String::new(),
}))
}
TokenKind::Ident(s) if s.len() == 1 => {
v @ 'a'..='z' | v @ 'A'..='Z' => {
match toks.next().unwrap().kind {
TokenKind::Symbol(Symbol::CloseSquareBrace) => {}
']' => {}
_ => return Err("expected \"]\".".into()),
}
format!(" {}", s)
format!(" {}", v)
}
_ => return Err("Expected \"]\".".into()),
}

113
src/style.rs
View File

@ -1,13 +1,14 @@
use std::fmt::{self, Display};
use std::iter::Peekable;
use crate::common::{Pos, QuoteKind, Symbol};
use crate::error::SassResult;
use crate::scope::Scope;
use crate::selector::Selector;
use crate::utils::{devour_whitespace, parse_interpolation, parse_quoted_string};
use crate::utils::{
devour_whitespace, eat_ident, read_until_semicolon_or_open_or_closing_curly_brace,
};
use crate::value::Value;
use crate::{Expr, Token, TokenKind};
use crate::{Expr, Token};
/// A style: `color: red`
#[derive(Clone, Debug, Eq, PartialEq)]
@ -68,62 +69,12 @@ impl<'a> StyleParser<'a> {
toks: &mut Peekable<I>,
scope: &Scope,
) -> SassResult<Value> {
let mut style = Vec::new();
let mut n = 0;
devour_whitespace(toks);
while let Some(tok) = toks.peek() {
match tok.kind {
TokenKind::MultilineComment(_) => {
toks.next();
continue;
}
TokenKind::Interpolation => n += 1,
TokenKind::Symbol(Symbol::CloseCurlyBrace) => {
if n == 0 {
break;
} else {
// todo: toks.next() and push
n -= 1;
}
}
ref q @ TokenKind::Symbol(Symbol::DoubleQuote)
| ref q @ TokenKind::Symbol(Symbol::SingleQuote) => {
let q = q.clone();
toks.next();
let (s, q) = if let Value::Ident(s, q) =
parse_quoted_string(toks, scope, &q, self.super_selector)?
{
(s, q)
} else {
unreachable!()
};
let quote_kind = Token::from_symbol(match q {
QuoteKind::Single => Symbol::SingleQuote,
QuoteKind::Double => Symbol::DoubleQuote,
_ => unreachable!(),
});
style.push(quote_kind.clone());
style.push(Token::from_string(s));
style.push(quote_kind);
continue;
}
TokenKind::Symbol(Symbol::OpenCurlyBrace)
| TokenKind::Symbol(Symbol::SemiColon) => break,
TokenKind::Symbol(Symbol::BitAnd) => {
style.push(Token {
kind: TokenKind::Symbol(Symbol::BitAnd),
pos: Pos::new(),
});
toks.next();
continue;
}
_ => {}
};
style.push(toks.next().unwrap());
}
Value::from_tokens(
&mut style.into_iter().peekable(),
self.scope,
&mut read_until_semicolon_or_open_or_closing_curly_brace(toks)
.into_iter()
.peekable(),
scope,
self.super_selector,
)
}
@ -138,13 +89,13 @@ impl<'a> StyleParser<'a> {
devour_whitespace(toks);
while let Some(tok) = toks.peek() {
match tok.kind {
TokenKind::Symbol(Symbol::OpenCurlyBrace) => {
'{' => {
toks.next();
devour_whitespace(toks);
loop {
let property = self.parse_property(toks, super_property.clone())?;
if let Some(tok) = toks.peek() {
if tok.is_symbol(Symbol::OpenCurlyBrace) {
if tok.kind == '{' {
match self.eat_style_group(toks, property, scope)? {
Expr::Styles(s) => styles.extend(s),
Expr::Style(s) => styles.push(*s),
@ -152,7 +103,7 @@ impl<'a> StyleParser<'a> {
}
devour_whitespace(toks);
if let Some(tok) = toks.peek() {
if tok.is_symbol(Symbol::CloseCurlyBrace) {
if tok.kind == '}' {
toks.next();
devour_whitespace(toks);
return Ok(Expr::Styles(styles));
@ -164,16 +115,17 @@ impl<'a> StyleParser<'a> {
}
}
let value = self.parse_style_value(toks, scope)?;
dbg!(&value);
match toks.peek().unwrap().kind {
TokenKind::Symbol(Symbol::CloseCurlyBrace) => {
'}' => {
styles.push(Style { property, value });
}
TokenKind::Symbol(Symbol::SemiColon) => {
';' => {
toks.next();
devour_whitespace(toks);
styles.push(Style { property, value });
}
TokenKind::Symbol(Symbol::OpenCurlyBrace) => {
'{' => {
styles.push(Style {
property: property.clone(),
value,
@ -191,7 +143,7 @@ impl<'a> StyleParser<'a> {
}
if let Some(tok) = toks.peek() {
match tok.kind {
TokenKind::Symbol(Symbol::CloseCurlyBrace) => {
'}' => {
toks.next();
devour_whitespace(toks);
return Ok(Expr::Styles(styles));
@ -203,17 +155,14 @@ impl<'a> StyleParser<'a> {
}
_ => {
let val = self.parse_style_value(toks, scope)?;
let t = match toks.peek() {
Some(tok) => tok,
None => return Err("expected more input.".into()),
};
let t = toks.peek().ok_or("expected more input.")?;
match t.kind {
TokenKind::Symbol(Symbol::CloseCurlyBrace) => {}
TokenKind::Symbol(Symbol::SemiColon) => {
'}' => {}
';' => {
toks.next();
devour_whitespace(toks);
}
TokenKind::Symbol(Symbol::OpenCurlyBrace) => {
'{' => {
let mut v = vec![Style {
property: super_property.clone(),
value: val,
@ -242,22 +191,14 @@ impl<'a> StyleParser<'a> {
toks: &mut Peekable<I>,
mut super_property: String,
) -> SassResult<String> {
let mut property = String::new();
while let Some(Token { kind, .. }) = toks.next() {
match kind {
TokenKind::Whitespace(_) | TokenKind::MultilineComment(_) => continue,
TokenKind::Ident(ref s) => property.push_str(s),
TokenKind::Interpolation => property.push_str(
&parse_interpolation(toks, self.scope, self.super_selector)?.to_string(),
),
TokenKind::Symbol(Symbol::Colon) => break,
TokenKind::Symbol(Symbol::BitAnd) => {
property.push_str(&self.super_selector.to_string())
}
_ => property.push_str(&kind.to_string()),
};
}
devour_whitespace(toks);
let property = eat_ident(toks, &self.scope, &self.super_selector)?;
devour_whitespace(toks);
if toks.peek().is_some() && toks.peek().unwrap().kind == ':' {
toks.next();
devour_whitespace(toks);
}
if super_property.is_empty() {
Ok(property)
} else {

140
src/token.rs
View File

@ -1,33 +1,15 @@
use std::fmt;
use crate::common::Pos;
use crate::utils::IsWhitespace;
use crate::atrule::AtRuleKind;
use crate::common::{Keyword, Op, Pos, Symbol, Whitespace};
use crate::error::SassError;
use crate::utils::{IsComment, IsWhitespace};
#[derive(Clone, Debug, Eq, PartialEq)]
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub(crate) struct Token {
pub pos: Pos,
pub kind: TokenKind,
pub kind: char,
}
impl Token {
pub fn is_symbol(&self, s: Symbol) -> bool {
self.kind.is_symbol(s)
}
pub fn from_string(s: String) -> Self {
Token {
kind: TokenKind::Ident(s),
pos: Pos::new(),
}
}
pub fn from_symbol(s: Symbol) -> Self {
Token {
kind: TokenKind::Symbol(s),
pos: Pos::new(),
}
pub const fn new(pos: Pos, kind: char) -> Self {
Self { pos, kind }
}
pub const fn pos(&self) -> Pos {
@ -37,7 +19,7 @@ impl Token {
impl IsWhitespace for Token {
fn is_whitespace(&self) -> bool {
if let TokenKind::Whitespace(_) = self.kind {
if self.kind.is_whitespace() {
return true;
}
false
@ -46,67 +28,67 @@ impl IsWhitespace for Token {
impl IsWhitespace for &Token {
fn is_whitespace(&self) -> bool {
if let TokenKind::Whitespace(_) = self.kind {
if self.kind.is_whitespace() {
return true;
}
false
}
}
impl IsComment for Token {
fn is_comment(&self) -> bool {
if let TokenKind::MultilineComment(_) = self.kind {
return true;
}
false
}
}
// impl IsComment for Token {
// fn is_comment(&self) -> bool {
// if let TokenKind::MultilineComment(_) = self.kind {
// return true;
// }
// false
// }
// }
impl IsComment for &Token {
fn is_comment(&self) -> bool {
if let TokenKind::MultilineComment(_) = self.kind {
return true;
}
false
}
}
// impl IsComment for &Token {
// fn is_comment(&self) -> bool {
// if let TokenKind::MultilineComment(_) = self.kind {
// return true;
// }
// false
// }
// }
#[derive(Clone, Debug, Eq, PartialEq)]
pub(crate) enum TokenKind {
Ident(String),
Symbol(Symbol),
AtRule(AtRuleKind),
Keyword(Keyword),
Number(String),
Whitespace(Whitespace),
Variable(String),
Op(Op),
MultilineComment(String),
Interpolation,
Error(SassError),
}
// #[derive(Clone, Debug, Eq, PartialEq)]
// pub(crate) enum TokenKind {
// Ident(String),
// Symbol(Symbol),
// AtRule(AtRuleKind),
// Keyword(Keyword),
// Number(String),
// Whitespace(Whitespace),
// Variable(String),
// Op(Op),
// MultilineComment(String),
// Interpolation,
// Error(SassError),
// }
impl TokenKind {
pub fn is_symbol(&self, s: Symbol) -> bool {
self == &TokenKind::Symbol(s)
}
}
// impl TokenKind {
// pub fn is_symbol(&self, s: Symbol) -> bool {
// self == &TokenKind::Symbol(s)
// }
// }
impl fmt::Display for TokenKind {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
TokenKind::Ident(s) | TokenKind::Number(s) => write!(f, "{}", s),
TokenKind::Symbol(s) => write!(f, "{}", s),
TokenKind::AtRule(s) => write!(f, "{}", s),
TokenKind::Op(s) => write!(f, "{}", s),
TokenKind::Whitespace(s) => write!(f, "{}", s),
TokenKind::Keyword(kw) => write!(f, "{}", kw),
TokenKind::MultilineComment(s) => write!(f, "/*{}*/", s),
TokenKind::Variable(s) => write!(f, "{}", s),
TokenKind::Interpolation | TokenKind::Error(..) => {
panic!("we don't want to format TokenKind::Interpolation using Display")
}
}
}
}
// impl fmt::Display for TokenKind {
// #[inline]
// fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
// match self {
// TokenKind::Ident(s) | TokenKind::Number(s) => write!(f, "{}", s),
// TokenKind::Symbol(s) => write!(f, "{}", s),
// TokenKind::AtRule(s) => write!(f, "{}", s),
// TokenKind::Op(s) => write!(f, "{}", s),
// TokenKind::Whitespace(s) => write!(f, "{}", s),
// TokenKind::Keyword(kw) => write!(f, "{}", kw),
// TokenKind::MultilineComment(s) => write!(f, "/*{}*/", s),
// TokenKind::Variable(s) => write!(f, "{}", s),
// TokenKind::Interpolation | TokenKind::Error(..) => {
// panic!("we don't want to format TokenKind::Interpolation using Display")
// }
// }
// }
// }

424
src/utils.rs
View File

@ -1,11 +1,11 @@
use std::iter::{Iterator, Peekable};
use crate::common::{Keyword, QuoteKind, Symbol, Whitespace};
use crate::common::QuoteKind;
use crate::error::SassResult;
use crate::lexer::Lexer;
use crate::selector::Selector;
use crate::value::Value;
use crate::{Scope, Token, TokenKind};
use crate::{Scope, Token};
pub(crate) trait IsWhitespace {
fn is_whitespace(&self) -> bool;
@ -29,18 +29,30 @@ pub(crate) trait IsComment {
fn is_comment(&self) -> bool;
}
pub(crate) fn devour_whitespace_or_comment<I: Iterator<Item = W>, W: IsWhitespace + IsComment>(
pub(crate) fn devour_whitespace_or_comment<I: Iterator<Item = Token>>(
s: &mut Peekable<I>,
) -> bool {
) -> SassResult<bool> {
let mut found_whitespace = false;
while let Some(w) = s.peek() {
if !w.is_whitespace() && !w.is_comment() {
if w.kind == '/' {
s.next();
match s.peek().unwrap().kind {
'*' => {
eat_comment(s, &Scope::new(), &Selector::new())?;
}
'/' => read_until_newline(s),
_ => return Err("Expected expression.".into()),
};
found_whitespace = true;
continue;
}
if !w.is_whitespace() {
break;
}
found_whitespace = true;
s.next();
}
found_whitespace
Ok(found_whitespace)
}
pub(crate) fn parse_interpolation<I: Iterator<Item = Token>>(
@ -51,22 +63,31 @@ pub(crate) fn parse_interpolation<I: Iterator<Item = Token>>(
let mut val = String::new();
while let Some(tok) = tokens.next() {
match tok.kind {
TokenKind::Symbol(Symbol::CloseCurlyBrace) => break,
TokenKind::Symbol(Symbol::OpenCurlyBrace) => {
todo!("invalid character in interpolation")
'}' => break,
'{' => todo!("invalid character in interpolation"),
q @ '"' | q @ '\'' => {
val.push_str(&parse_quoted_string(tokens, scope, q, super_selector)?.to_string())
}
q @ TokenKind::Symbol(Symbol::DoubleQuote)
| q @ TokenKind::Symbol(Symbol::SingleQuote) => {
val.push_str(&parse_quoted_string(tokens, scope, &q, super_selector)?.to_string())
}
TokenKind::Variable(ref v) => {
val.push_str(&scope.get_var(v)?.clone().unquote().to_string())
}
TokenKind::Interpolation => val.push_str(
&Lexer::new(&parse_interpolation(tokens, scope, super_selector)?.to_string())
.map(|x| x.kind.to_string())
.collect::<String>(),
'$' => val.push_str(
&scope
.get_var(&eat_ident(tokens, scope, super_selector)?)?
.clone()
.unquote()
.to_string(),
),
'#' => {
if tokens.next().unwrap().kind == '{' {
val.push_str(
&Lexer::new(
&parse_interpolation(tokens, scope, super_selector)?.to_string(),
)
.map(|x| x.kind.to_string())
.collect::<String>(),
)
} else {
return Err("Expected identifier.".into());
}
}
_ => val.push_str(&tok.kind.to_string()),
}
}
@ -106,9 +127,8 @@ pub(crate) fn read_until_open_curly_brace<I: Iterator<Item = Token>>(
let mut n = 0;
while let Some(tok) = toks.peek() {
match tok.kind {
TokenKind::Symbol(Symbol::OpenCurlyBrace) => n += 1,
TokenKind::Symbol(Symbol::CloseCurlyBrace) => n -= 1,
TokenKind::Interpolation => n += 1,
'{' => n += 1,
'}' => n -= 1,
_ => {}
}
if n == 1 {
@ -126,16 +146,15 @@ pub(crate) fn read_until_closing_curly_brace<I: Iterator<Item = Token>>(
let mut nesting = 0;
while let Some(tok) = toks.peek() {
match tok.kind {
TokenKind::Symbol(Symbol::DoubleQuote) | TokenKind::Symbol(Symbol::SingleQuote) => {
let quote = toks.next().unwrap();
t.push(quote.clone());
t.extend(read_until_closing_quote(toks, &quote.kind));
q @ '"' | q @ '\'' => {
t.push(toks.next().unwrap());
t.extend(read_until_closing_quote(toks, q));
}
TokenKind::Interpolation | TokenKind::Symbol(Symbol::OpenCurlyBrace) => {
'{' => {
nesting += 1;
t.push(toks.next().unwrap());
}
TokenKind::Symbol(Symbol::CloseCurlyBrace) => {
'}' => {
if nesting == 0 {
break;
} else {
@ -152,70 +171,116 @@ pub(crate) fn read_until_closing_curly_brace<I: Iterator<Item = Token>>(
pub(crate) fn read_until_closing_quote<I: Iterator<Item = Token>>(
toks: &mut Peekable<I>,
q: &TokenKind,
q: char,
) -> Vec<Token> {
let mut is_escaped = false;
let mut t = Vec::new();
for tok in toks {
match tok.kind {
TokenKind::Symbol(Symbol::DoubleQuote)
if !is_escaped && q == &TokenKind::Symbol(Symbol::DoubleQuote) =>
{
'"' if !is_escaped && q == '"' => {
t.push(tok);
break;
}
TokenKind::Symbol(Symbol::DoubleQuote) if is_escaped => {
'"' if is_escaped => {
t.push(tok);
is_escaped = false;
continue;
}
TokenKind::Symbol(Symbol::SingleQuote)
if !is_escaped && q == &TokenKind::Symbol(Symbol::SingleQuote) =>
{
'\'' if !is_escaped && q == '\'' => {
t.push(tok);
break;
}
TokenKind::Symbol(Symbol::SingleQuote) if is_escaped => {
'\'' if is_escaped => {
t.push(tok);
is_escaped = false;
continue;
}
TokenKind::Symbol(Symbol::BackSlash) if !is_escaped => {
'\\' if !is_escaped => {
t.push(tok);
is_escaped = true
}
TokenKind::Symbol(Symbol::BackSlash) => {
'\\' => {
is_escaped = false;
t.push(tok);
continue;
}
_ if is_escaped => {
is_escaped = false;
t.push(tok);
}
_ => t.push(tok),
}
}
t
}
pub(crate) fn read_until_semicolon_or_curly_brace<I: Iterator<Item = Token>>(
pub(crate) fn read_until_semicolon_or_closing_curly_brace<I: Iterator<Item = Token>>(
toks: &mut Peekable<I>,
) -> Vec<Token> {
let mut t = Vec::new();
let mut nesting = 0;
while let Some(tok) = toks.peek() {
match tok.kind {
TokenKind::Symbol(Symbol::SemiColon) => {
toks.next();
';' => {
break;
}
TokenKind::Symbol(Symbol::DoubleQuote) | TokenKind::Symbol(Symbol::SingleQuote) => {
'"' | '\'' => {
let quote = toks.next().unwrap();
t.push(quote.clone());
t.extend(read_until_closing_quote(toks, &quote.kind));
t.extend(read_until_closing_quote(toks, quote.kind));
}
TokenKind::Interpolation | TokenKind::Symbol(Symbol::OpenCurlyBrace) => {
'{' => {
nesting += 1;
t.push(toks.next().unwrap());
}
TokenKind::Symbol(Symbol::CloseCurlyBrace) => {
'}' => {
if nesting == 0 {
break;
} else {
nesting -= 1;
t.push(toks.next().unwrap());
}
}
_ => t.push(toks.next().unwrap()),
}
}
devour_whitespace(toks);
t
}
pub(crate) fn read_until_semicolon_or_open_or_closing_curly_brace<I: Iterator<Item = Token>>(
toks: &mut Peekable<I>,
) -> Vec<Token> {
let mut t = Vec::new();
let mut nesting = 0;
while let Some(tok) = toks.peek() {
match tok.kind {
';' => {
break;
}
'"' | '\'' => {
let quote = toks.next().unwrap();
t.push(quote.clone());
t.extend(read_until_closing_quote(toks, quote.kind));
}
'#' => {
t.push(toks.next().unwrap());
match toks.peek().unwrap().kind {
'{' => nesting += 1,
';' => break,
'}' => {
if nesting == 0 {
break;
} else {
nesting -= 1;
}
}
_ => {}
}
t.push(toks.next().unwrap());
}
'{' => break,
'}' => {
if nesting == 0 {
break;
} else {
@ -238,51 +303,125 @@ pub(crate) fn eat_variable_value<I: Iterator<Item = Token>>(
devour_whitespace(toks);
let mut default = false;
let mut global = false;
let mut raw = read_until_semicolon_or_curly_brace(toks)
let mut raw = read_until_semicolon_or_closing_curly_brace(toks)
.into_iter()
.filter(|t| match t.kind {
TokenKind::Keyword(Keyword::Default) => {
default = true;
false
}
TokenKind::Keyword(Keyword::Global) => {
global = true;
false
}
_ => true,
})
.peekable();
let val = Value::from_tokens(&mut raw, scope, super_selector)?;
if toks.peek().unwrap().kind == ';' {
toks.next();
}
let mut x = Vec::new();
while let Some(tok) = raw.next() {
match tok.kind {
'!' => {
let next = raw.next().unwrap();
match next.kind {
'i' => todo!("!important"),
'g' => {
if eat_ident(&mut raw, scope, super_selector)?
.to_ascii_lowercase()
.as_str()
== "lobal"
{
global = true;
} else {
return Err("Invalid flag name.".into());
}
}
'd' => {
if eat_ident(&mut raw, scope, super_selector)?
.to_ascii_lowercase()
.as_str()
== "efault"
{
default = true;
} else {
return Err("Invalid flag name.".into());
}
}
_ => return Err("Invalid flag name.".into()),
}
}
_ => x.push(tok),
}
}
devour_whitespace(toks);
let val = Value::from_tokens(&mut x.into_iter().peekable(), scope, super_selector)?;
Ok(VariableDecl::new(val, default, global))
}
pub(crate) fn flatten_ident<I: Iterator<Item = Token>>(
pub(crate) fn eat_ident<I: Iterator<Item = Token>>(
toks: &mut Peekable<I>,
scope: &Scope,
super_selector: &Selector,
) -> SassResult<String> {
let mut s = String::new();
while let Some(tok) = toks.peek() {
match tok.kind.clone() {
TokenKind::Interpolation => {
match tok.kind {
'#' => {
toks.next();
s.push_str(&parse_interpolation(toks, scope, super_selector)?.to_string())
if toks.peek().unwrap().kind == '{' {
toks.next();
s.push_str(&parse_interpolation(toks, scope, super_selector)?.to_string());
} else {
return Err("Expected identifier.".into());
}
}
TokenKind::Ident(ref i) => {
'a'..='z' | 'A'..='Z' | '0'..='9' | '-' | '_' => s.push(toks.next().unwrap().kind),
'\\' => {
toks.next();
s.push_str(i)
let mut n = String::new();
while let Some(c) = toks.peek() {
if !c.kind.is_ascii_hexdigit() || n.len() > 6 {
break;
}
n.push(c.kind);
toks.next();
}
if n.is_empty() {
let c = toks.next().unwrap().kind;
if (c == '-' && !s.is_empty()) || c.is_ascii_alphabetic() {
s.push(c);
} else {
s.push_str(&format!("\\{}", c));
}
continue;
}
devour_whitespace(toks);
let c = std::char::from_u32(u32::from_str_radix(&n, 16).unwrap()).unwrap();
if c.is_control() && c != '\t' {
s.push_str(&format!("\\{} ", n.to_ascii_lowercase()));
} else if !c.is_ascii_alphanumeric() && s.is_empty() && c.is_ascii() {
s.push_str(&format!("\\{}", c));
} else if c.is_numeric() && s.is_empty() {
s.push_str(&format!("\\{} ", n))
} else {
s.push(c);
};
}
TokenKind::Number(ref n) => {
toks.next();
s.push_str(n)
_ => break,
}
}
Ok(s)
}
pub(crate) fn eat_ident_no_interpolation<I: Iterator<Item = Token>>(
toks: &mut Peekable<I>,
) -> SassResult<String> {
let mut s = String::new();
while let Some(tok) = toks.peek() {
match tok.kind {
'#' => {
break;
}
TokenKind::Symbol(Symbol::BackSlash) => {
'a'..='z' | 'A'..='Z' | '0'..='9' | '-' | '_' => s.push(toks.next().unwrap().kind),
'\\' => {
s.push('\\');
toks.next();
if let Some(tok) = toks.next() {
match tok.kind {
TokenKind::Symbol(Symbol::Plus) => s.push('+'),
TokenKind::Symbol(Symbol::BackSlash) => s.push('\\'),
'+' => s.push('+'),
'\\' => s.push('\\'),
_ => todo!("value after \\"),
}
} else {
@ -295,61 +434,148 @@ pub(crate) fn flatten_ident<I: Iterator<Item = Token>>(
Ok(s)
}
pub(crate) fn eat_number<I: Iterator<Item = Token>>(toks: &mut Peekable<I>) -> SassResult<String> {
let mut whole = String::new();
while let Some(c) = toks.peek() {
if !c.kind.is_numeric() {
break;
}
let tok = toks.next().unwrap();
whole.push(tok.kind);
}
if toks.peek().is_none() {
return Ok(whole);
}
let mut dec = String::new();
if toks.peek().unwrap().kind == '.' {
toks.next();
dec.push('.');
while let Some(c) = toks.peek() {
if !c.kind.is_numeric() {
break;
}
let tok = toks.next().unwrap();
dec.push(tok.kind);
}
}
if dec.len() == 1 {
return Err("Expected digit.".into());
}
whole.push_str(&dec);
Ok(whole)
}
/// Eat tokens until a newline
///
/// This exists largely to eat silent comments, "//"
/// We only have to check for \n as the lexing step normalizes all newline characters
///
/// The newline is consumed
pub(crate) fn read_until_newline<I: Iterator<Item = Token>>(toks: &mut Peekable<I>) {
while let Some(tok) = toks.next() {
if tok.kind == '\n' {
break;
}
}
}
/// Eat and return the contents of a comment.
///
/// This function assumes that the starting "/*" has already been consumed
/// The entirety of the comment, including the ending "*/" is consumed.
/// Note that the ending "*/" is not included in the output.
pub(crate) fn eat_comment<I: Iterator<Item = Token>>(
toks: &mut Peekable<I>,
_scope: &Scope,
_super_selector: &Selector,
) -> SassResult<String> {
let mut comment = String::new();
while let Some(tok) = toks.next() {
if tok.kind == '*' {
if toks.peek().unwrap().kind == '/' {
toks.next();
break;
}
}
comment.push(tok.kind);
}
devour_whitespace(toks);
Ok(comment)
}
pub(crate) fn parse_quoted_string<I: Iterator<Item = Token>>(
toks: &mut Peekable<I>,
scope: &Scope,
q: &TokenKind,
q: char,
super_selector: &Selector,
) -> SassResult<Value> {
let mut s = String::new();
let mut is_escaped = false;
let mut found_interpolation = false;
while let Some(tok) = toks.next() {
// dbg!(&tok);
match tok.kind {
TokenKind::Symbol(Symbol::DoubleQuote)
if !is_escaped && q == &TokenKind::Symbol(Symbol::DoubleQuote) =>
{
break
}
TokenKind::Symbol(Symbol::DoubleQuote) if is_escaped => {
'"' if !is_escaped && q == '"' => break,
'"' if is_escaped => {
s.push('"');
is_escaped = false;
continue;
}
TokenKind::Symbol(Symbol::SingleQuote)
if !is_escaped && q == &TokenKind::Symbol(Symbol::SingleQuote) =>
{
break
}
TokenKind::Symbol(Symbol::SingleQuote) if is_escaped => {
'\'' if !is_escaped && q == '\'' => break,
'\'' if is_escaped => {
s.push('\'');
is_escaped = false;
continue;
}
TokenKind::Symbol(Symbol::BackSlash) if !is_escaped => is_escaped = true,
TokenKind::Symbol(Symbol::BackSlash) => {
'\\' if !is_escaped => is_escaped = true,
'\\' => {
is_escaped = false;
s.push('\\');
continue;
}
TokenKind::Interpolation if !is_escaped => {
found_interpolation = true;
s.push_str(&parse_interpolation(toks, scope, super_selector)?.to_string());
continue;
'#' if !is_escaped => {
if toks.peek().unwrap().kind == '{' {
toks.next();
found_interpolation = true;
s.push_str(&parse_interpolation(toks, scope, super_selector)?.to_string());
continue;
} else {
s.push('#');
}
}
TokenKind::Interpolation => {
s.push('#');
s.push('{');
'\n' => return Err("Expected \".".into()),
v if v.is_ascii_hexdigit() && is_escaped => {
let mut n = v.to_string();
while let Some(c) = toks.peek() {
if !c.kind.is_ascii_hexdigit() || n.len() > 6 {
break;
}
n.push(c.kind);
toks.next();
}
let c = std::char::from_u32(u32::from_str_radix(&n, 16).unwrap()).unwrap();
if c.is_control() && c != '\t' && c != '\0' {
s.push_str(&format!("\\{} ", n.to_ascii_lowercase()));
} else {
s.push(c);
}
is_escaped = false;
continue;
}
TokenKind::Whitespace(Whitespace::Newline) => return Err("Expected \".".into()),
_ if is_escaped => {
is_escaped = false;
}
_ => {}
}
if is_escaped && tok.kind != TokenKind::Symbol(Symbol::BackSlash) {
if is_escaped && tok.kind != '\\' {
is_escaped = false;
}
if tok.kind != TokenKind::Symbol(Symbol::BackSlash) {
if tok.kind != '\\' {
s.push_str(&tok.kind.to_string());
}
}
@ -357,8 +583,8 @@ pub(crate) fn parse_quoted_string<I: Iterator<Item = Token>>(
QuoteKind::Double
} else {
match q {
TokenKind::Symbol(Symbol::DoubleQuote) => QuoteKind::Double,
TokenKind::Symbol(Symbol::SingleQuote) => QuoteKind::Single,
'"' => QuoteKind::Double,
'\'' => QuoteKind::Single,
_ => unreachable!(),
}
};

353
src/value/parse.rs
View File

@ -8,64 +8,109 @@ use num_traits::pow;
use crate::args::eat_call_args;
use crate::builtin::GLOBAL_FUNCTIONS;
use crate::color::Color;
use crate::common::{Brackets, Keyword, ListSeparator, Op, QuoteKind, Symbol};
use crate::common::{Brackets, ListSeparator, Op, QuoteKind};
use crate::error::SassResult;
use crate::scope::Scope;
use crate::selector::Selector;
use crate::unit::Unit;
use crate::utils::{
devour_whitespace_or_comment, flatten_ident, parse_interpolation, parse_quoted_string,
devour_whitespace, eat_comment, eat_ident, eat_number, parse_interpolation,
parse_quoted_string, read_until_newline,
};
use crate::value::Value;
use crate::{Token, TokenKind};
use crate::Token;
use super::number::Number;
fn parse_hex(s: &str) -> Value {
fn parse_hex<I: Iterator<Item = Token>>(
toks: &mut Peekable<I>,
scope: &Scope,
super_selector: &Selector,
) -> SassResult<Value> {
let mut s = String::with_capacity(8);
if toks.peek().unwrap().kind.is_ascii_digit() {
while let Some(c) = toks.peek() {
if !c.kind.is_ascii_hexdigit() || s.len() == 8 {
break;
}
s.push(toks.next().unwrap().kind);
}
} else {
let i = eat_ident(toks, scope, super_selector)?;
if i.chars().all(|c| c.is_ascii_hexdigit()) {
s = i;
} else {
return Ok(Value::Ident(format!("#{}", i), QuoteKind::None));
}
}
match s.len() {
3 => {
let v = match u16::from_str_radix(s, 16) {
let v = match u16::from_str_radix(&s, 16) {
Ok(a) => a,
Err(_) => return Value::Ident(format!("#{}", s), QuoteKind::None),
Err(_) => return Ok(Value::Ident(format!("#{}", s), QuoteKind::None)),
};
let red = (((v & 0xf00) >> 8) * 0x11) as u8;
let green = (((v & 0x0f0) >> 4) * 0x11) as u8;
let blue = ((v & 0x00f) * 0x11) as u8;
Value::Color(Color::new(red, green, blue, 1, format!("#{}", s)))
Ok(Value::Color(Color::new(
red,
green,
blue,
1,
format!("#{}", s),
)))
}
4 => {
let v = match u16::from_str_radix(s, 16) {
let v = match u16::from_str_radix(&s, 16) {
Ok(a) => a,
Err(_) => return Value::Ident(format!("#{}", s), QuoteKind::None),
Err(_) => return Ok(Value::Ident(format!("#{}", s), QuoteKind::None)),
};
let red = (((v & 0xf000) >> 12) * 0x11) as u8;
let green = (((v & 0x0f00) >> 8) * 0x11) as u8;
let blue = (((v & 0x00f0) >> 4) * 0x11) as u8;
let alpha = ((v & 0x000f) * 0x11) as u8;
Value::Color(Color::new(red, green, blue, alpha, format!("#{}", s)))
Ok(Value::Color(Color::new(
red,
green,
blue,
alpha,
format!("#{}", s),
)))
}
6 => {
let v = match u32::from_str_radix(s, 16) {
let v = match u32::from_str_radix(&s, 16) {
Ok(a) => a,
Err(_) => return Value::Ident(format!("#{}", s), QuoteKind::None),
Err(_) => return Ok(Value::Ident(format!("#{}", s), QuoteKind::None)),
};
let red = ((v & 0x00ff_0000) >> 16) as u8;
let green = ((v & 0x0000_ff00) >> 8) as u8;
let blue = (v & 0x0000_00ff) as u8;
Value::Color(Color::new(red, green, blue, 1, format!("#{}", s)))
Ok(Value::Color(Color::new(
red,
green,
blue,
1,
format!("#{}", s),
)))
}
8 => {
let v = match u32::from_str_radix(s, 16) {
let v = match u32::from_str_radix(&s, 16) {
Ok(a) => a,
Err(_) => return Value::Ident(format!("#{}", s), QuoteKind::None),
Err(_) => return Ok(Value::Ident(format!("#{}", s), QuoteKind::None)),
};
let red = ((v & 0xff00_0000) >> 24) as u8;
let green = ((v & 0x00ff_0000) >> 16) as u8;
let blue = ((v & 0x0000_ff00) >> 8) as u8;
let alpha = (v & 0x0000_00ff) as u8;
Value::Color(Color::new(red, green, blue, alpha, format!("#{}", s)))
Ok(Value::Color(Color::new(
red,
green,
blue,
alpha,
format!("#{}", s),
)))
}
_ => Value::Ident(format!("#{}", s), QuoteKind::None),
_ => Err("Expected hex digit.".into()),
}
}
@ -76,18 +121,16 @@ impl Value {
super_selector: &Selector,
) -> SassResult<Self> {
let left = Self::_from_tokens(toks, scope, super_selector)?;
devour_whitespace_or_comment(toks);
devour_whitespace(toks);
let next = match toks.peek() {
Some(x) => x,
None => return Ok(left),
};
match next.kind {
TokenKind::Symbol(Symbol::SemiColon)
| TokenKind::Symbol(Symbol::CloseParen)
| TokenKind::Symbol(Symbol::CloseSquareBrace) => Ok(left),
TokenKind::Symbol(Symbol::Comma) => {
';' | ')' | ']' => Ok(left),
',' => {
toks.next();
devour_whitespace_or_comment(toks);
devour_whitespace(toks);
if toks.peek() == None {
return Ok(Value::List(
vec![left],
@ -95,13 +138,13 @@ impl Value {
Brackets::None,
));
} else if let Some(tok) = toks.peek() {
if tok.is_symbol(Symbol::CloseParen) {
if tok.kind == ')' {
return Ok(Value::List(
vec![left],
ListSeparator::Comma,
Brackets::None,
));
} else if tok.is_symbol(Symbol::CloseSquareBrace) {
} else if tok.kind == ']' {
return Ok(Value::List(
vec![left],
ListSeparator::Comma,
@ -122,28 +165,92 @@ impl Value {
))
}
}
TokenKind::Symbol(Symbol::Plus)
| TokenKind::Symbol(Symbol::Minus)
| TokenKind::Op(_)
| TokenKind::Symbol(Symbol::Mul)
| TokenKind::Symbol(Symbol::Div)
| TokenKind::Symbol(Symbol::Percent) => {
'+' | '-' | '*' | '%' => {
let op = match next.kind {
TokenKind::Symbol(Symbol::Plus) => Op::Plus,
TokenKind::Symbol(Symbol::Minus) => Op::Minus,
TokenKind::Symbol(Symbol::Mul) => Op::Mul,
TokenKind::Symbol(Symbol::Div) => Op::Div,
TokenKind::Symbol(Symbol::Percent) => Op::Rem,
TokenKind::Op(op) => op,
'+' => Op::Plus,
'-' => Op::Minus,
'*' => Op::Mul,
'/' => Op::Div,
'%' => Op::Rem,
_ => unsafe { std::hint::unreachable_unchecked() },
};
toks.next();
devour_whitespace_or_comment(toks);
devour_whitespace(toks);
let right = Self::from_tokens(toks, scope, super_selector)?;
Ok(Value::BinaryOp(Box::new(left), op, Box::new(right)))
}
'=' => {
toks.next();
if toks.peek().unwrap().kind == '=' {
toks.next();
devour_whitespace(toks);
let right = Self::from_tokens(toks, scope, super_selector)?;
Ok(Value::BinaryOp(Box::new(left), Op::Equal, Box::new(right)))
} else {
return Err("expected \"=\".".into());
}
}
'!' => {
toks.next();
if toks.peek().unwrap().kind == '=' {
toks.next();
devour_whitespace(toks);
let right = Self::from_tokens(toks, scope, super_selector)?;
Ok(Value::BinaryOp(
Box::new(left),
Op::NotEqual,
Box::new(right),
))
} else if eat_ident(toks, scope, super_selector)?
.to_ascii_lowercase()
.as_str()
== "important"
{
Ok(Value::List(
vec![left, Value::Important],
ListSeparator::Space,
Brackets::None,
))
} else {
return Err("Expected \"important\".".into());
}
}
'/' => {
toks.next();
match toks.peek().unwrap().kind {
v @ '*' | v @ '/' => {
toks.next();
if v == '*' {
eat_comment(toks, &Scope::new(), &Selector::new())?;
} else {
read_until_newline(toks);
}
devour_whitespace(toks);
if toks.peek().is_none() {
return Ok(left);
}
let right = Self::from_tokens(toks, scope, super_selector)?;
if let Value::List(v, ListSeparator::Space, ..) = right {
let mut v2 = vec![left];
v2.extend(v);
Ok(Value::List(v2, ListSeparator::Space, Brackets::None))
} else {
Ok(Value::List(
vec![left, right],
ListSeparator::Space,
Brackets::None,
))
}
}
_ => {
devour_whitespace(toks);
let right = Self::from_tokens(toks, scope, super_selector)?;
Ok(Value::BinaryOp(Box::new(left), Op::Div, Box::new(right)))
}
}
}
_ => {
devour_whitespace_or_comment(toks);
devour_whitespace(toks);
let right = Self::from_tokens(toks, scope, super_selector)?;
if let Value::List(v, ListSeparator::Space, ..) = right {
let mut v2 = vec![left];
@ -165,20 +272,20 @@ impl Value {
scope: &Scope,
super_selector: &Selector,
) -> SassResult<Self> {
let kind = if let Some(tok) = toks.next() {
let kind = if let Some(tok) = toks.peek() {
tok.kind
} else {
panic!("Unexpected EOF");
};
match kind {
TokenKind::Number(val) => {
'0'..='9' | '.' => {
let val = eat_number(toks)?;
let unit = if let Some(tok) = toks.peek() {
match tok.kind.clone() {
TokenKind::Ident(i) => {
toks.next();
Unit::from(&i)
match tok.kind {
'a'..='z' | 'A'..='Z' | '_' => {
Unit::from(&eat_ident(toks, scope, super_selector)?)
}
TokenKind::Symbol(Symbol::Percent) => {
'%' => {
toks.next();
Unit::Percent
}
@ -209,9 +316,10 @@ impl Value {
};
Ok(Value::Dimension(Number::new(n), unit))
}
TokenKind::Symbol(Symbol::OpenParen) => {
devour_whitespace_or_comment(toks);
if toks.peek().unwrap().is_symbol(Symbol::CloseParen) {
'(' => {
toks.next();
devour_whitespace(toks);
if toks.peek().unwrap().kind == ')' {
toks.next();
return Ok(Value::List(
Vec::new(),
@ -221,24 +329,26 @@ impl Value {
}
let val = Self::from_tokens(toks, scope, super_selector)?;
let next = toks.next();
if next.is_none() || !next.unwrap().is_symbol(Symbol::CloseParen) {
if next.is_none() || next.unwrap().kind != ')' {
return Err("expected \")\".".into());
}
Ok(Value::Paren(Box::new(val)))
}
TokenKind::Symbol(Symbol::BitAnd) => {
'&' => {
toks.next();
Ok(Value::Ident(super_selector.to_string(), QuoteKind::None))
}
TokenKind::Symbol(Symbol::Hash) => {
Ok(parse_hex(&flatten_ident(toks, scope, super_selector)?))
'#' => {
if let Ok(s) = eat_ident(toks, scope, super_selector) {
Ok(Value::Ident(s, QuoteKind::None))
} else {
Ok(parse_hex(toks, scope, super_selector)?)
}
}
TokenKind::Ident(mut s) => {
s.push_str(&flatten_ident(toks, scope, super_selector)?);
'a'..='z' | 'A'..='Z' | '_' | '\\' => {
let mut s = eat_ident(toks, scope, super_selector)?;
match toks.peek() {
Some(Token {
kind: TokenKind::Symbol(Symbol::OpenParen),
..
}) => {
Some(Token { kind: '(', .. }) => {
toks.next();
let func = match scope.get_fn(&s) {
Ok(f) => f,
@ -254,17 +364,23 @@ impl Value {
let mut unclosed_parens = 0;
while let Some(t) = toks.next() {
match &t.kind {
TokenKind::Symbol(Symbol::OpenParen) => {
'(' => {
unclosed_parens += 1;
}
TokenKind::Interpolation => s.push_str(
'#' if toks.next().unwrap().kind == '{' => s.push_str(
&parse_interpolation(toks, scope, super_selector)?
.to_string(),
),
TokenKind::Variable(v) => {
s.push_str(&scope.get_var(v)?.to_string())
}
TokenKind::Symbol(Symbol::CloseParen) => {
'$' => s.push_str(
&scope
.get_var(&eat_ident(
toks,
scope,
super_selector,
)?)?
.to_string(),
),
')' => {
if unclosed_parens <= 1 {
s.push(')');
break;
@ -289,18 +405,24 @@ impl Value {
if let Ok(c) = crate::color::ColorName::try_from(s.as_ref()) {
Ok(Value::Color(c.into_color(s)))
} else {
Ok(Value::Ident(s, QuoteKind::None))
match s.to_ascii_lowercase().as_str() {
"true" => Ok(Value::True),
"false" => Ok(Value::False),
"null" => Ok(Value::Null),
_ => Ok(Value::Ident(s, QuoteKind::None)),
}
}
}
}
}
q @ TokenKind::Symbol(Symbol::DoubleQuote)
| q @ TokenKind::Symbol(Symbol::SingleQuote) => {
parse_quoted_string(toks, scope, &q, super_selector)
q @ '"' | q @ '\'' => {
toks.next();
parse_quoted_string(toks, scope, q, super_selector)
}
TokenKind::Symbol(Symbol::OpenSquareBrace) => {
'[' => {
toks.next();
if let Some(tok) = toks.peek() {
if tok.is_symbol(Symbol::CloseSquareBrace) {
if tok.kind == ']' {
toks.next();
return Ok(Value::List(
Vec::new(),
@ -310,69 +432,54 @@ impl Value {
}
}
let inner = Self::from_tokens(toks, scope, super_selector)?;
devour_whitespace_or_comment(toks);
devour_whitespace(toks);
toks.next();
Ok(match inner {
Value::List(v, sep, ..) => Value::List(v, sep, Brackets::Bracketed),
v => Value::List(vec![v], ListSeparator::Space, Brackets::Bracketed),
})
}
TokenKind::Variable(ref v) => Ok(scope.get_var(v)?),
TokenKind::Interpolation => {
let mut s = parse_interpolation(toks, scope, super_selector)?.to_string();
while let Some(tok) = toks.peek() {
match tok.kind.clone() {
TokenKind::Interpolation => {
toks.next();
s.push_str(
&parse_interpolation(toks, scope, super_selector)?.to_string(),
)
}
TokenKind::Ident(ref i) => {
toks.next();
s.push_str(i)
}
_ => break,
}
}
Ok(Value::Ident(s, QuoteKind::None))
'$' => {
toks.next();
Ok(scope.get_var(&eat_ident(toks, scope, super_selector)?)?)
}
TokenKind::Keyword(Keyword::Important) => Ok(Value::Important),
TokenKind::Keyword(Keyword::True) => Ok(Value::True),
TokenKind::Keyword(Keyword::False) => Ok(Value::False),
TokenKind::Keyword(Keyword::Null) => Ok(Value::Null),
TokenKind::Keyword(Keyword::From(s)) => Ok(Value::Ident(s, QuoteKind::None)),
TokenKind::Keyword(Keyword::Through(s)) => Ok(Value::Ident(s, QuoteKind::None)),
TokenKind::Keyword(Keyword::To(s)) => Ok(Value::Ident(s, QuoteKind::None)),
TokenKind::AtRule(_) => Err("expected \";\".".into()),
TokenKind::Error(e) => Err(e),
TokenKind::Symbol(Symbol::BackSlash) => {
if let Some(tok) = toks.next() {
match tok.kind {
TokenKind::Symbol(s) => Ok(Value::Ident(
format!("\\{}{}", s, flatten_ident(toks, scope, super_selector)?),
QuoteKind::None,
)),
TokenKind::Whitespace(w) => {
Ok(Value::Ident(format!("\\{}", w), QuoteKind::None))
}
TokenKind::Ident(s) => Ok(Value::Ident(s, QuoteKind::None)),
_ => todo!("value after \\"),
}
'@' => Err("expected \";\".".into()),
'+' => {
toks.next();
devour_whitespace(toks);
let v = Self::_from_tokens(toks, scope, super_selector)?;
Ok(Value::UnaryOp(Op::Plus, Box::new(v)))
}
'-' => {
toks.next();
devour_whitespace(toks);
let v = Self::_from_tokens(toks, scope, super_selector)?;
Ok(Value::UnaryOp(Op::Minus, Box::new(v)))
}
'!' => {
toks.next();
let v = eat_ident(toks, scope, super_selector)?;
if v.to_ascii_lowercase().as_str() == "important" {
Ok(Value::Important)
} else {
Err("Expected \"important\".".into())
}
}
'/' => {
toks.next();
if '*' == toks.peek().unwrap().kind {
toks.next();
eat_comment(toks, &Scope::new(), &Selector::new())?;
Self::_from_tokens(toks, scope, super_selector)
} else if '/' == toks.peek().unwrap().kind {
read_until_newline(toks);
devour_whitespace(toks);
Self::_from_tokens(toks, scope, super_selector)
} else {
todo!()
}
}
TokenKind::Op(Op::Plus) | TokenKind::Symbol(Symbol::Plus) => {
devour_whitespace_or_comment(toks);
let v = Self::_from_tokens(toks, scope, super_selector)?;
Ok(Value::UnaryOp(Op::Plus, Box::new(v)))
}
TokenKind::Op(Op::Minus) | TokenKind::Symbol(Symbol::Minus) => {
devour_whitespace_or_comment(toks);
let v = Self::_from_tokens(toks, scope, super_selector)?;
Ok(Value::UnaryOp(Op::Minus, Box::new(v)))
}
v if v.is_control() => Err("Expected expression.".into()),
v => {
dbg!(v);
panic!("Unexpected token in value parsing")

118
tests/if.rs
View File

@ -8,62 +8,62 @@ test!(
"@if true {\n a {\n color: foo;\n}\n}\n",
"a {\n color: foo;\n}\n"
);
// test!(
// if_inner_true,
// "a {\n @if true {\n color: foo;\n}\n}\n",
// "a {\n color: foo;\n}\n"
// );
// test!(
// if_toplevel_false,
// "@if false {\n a {\n color: foo;\n}\n}\n",
// ""
// );
// test!(
// if_inner_false,
// "a {\n @if false {\n color: foo;\n}\n}\n",
// ""
// );
// test!(
// if_else_toplevel_true,
// "@if true {\n a {\n color: foo;\n}\n} @else {\n b {\n color: bar;\n}\n}\n",
// "a {\n color: foo;\n}\n"
// );
// test!(
// if_else_inner_true,
// "a {\n @if true {\n color: foo;\n} @else {\n color: bar;\n}\n}\n",
// "a {\n color: foo;\n}\n"
// );
// test!(
// if_else_toplevel_false,
// "@if false {\n a {\n color: foo;\n}\n} @else {\n a {\n color: bar;\n}\n}\n",
// "a {\n color: bar;\n}\n"
// );
// test!(
// if_else_inner_false,
// "a {\n @if false {\n color: foo;\n} @else {\n color: bar;\n}\n}\n",
// "a {\n color: bar;\n}\n"
// );
// error!(
// no_brace_after_else,
// "@if false {} @else -}", "Error: expected \"{\"."
// );
// test!(
// if_else_if_no_else,
// "a {\n @if false {\n color: red;\n} @else if true {\n color: blue;\n}\n}\n",
// "a {\n color: blue;\n}\n"
// );
// test!(
// if_false_else_if_false_else,
// "a {\n @if false {\n color: red;\n} @else if false {\n color: blue;\n} @else {\n color: green;\n}\n}\n",
// "a {\n color: green;\n}\n"
// );
// test!(
// if_false_else_if_true_else,
// "a {\n @if false {\n color: red;\n} @else if true {\n color: blue;\n} @else {\n color: green;\n}\n}\n",
// "a {\n color: blue;\n}\n"
// );
// test!(
// if_inner_style_missing_semicolon,
// "a {\n @if true {\n color: red\n }\n}\n",
// "a {\n color: red;\n}\n"
// );
test!(
if_inner_true,
"a {\n @if true {\n color: foo;\n}\n}\n",
"a {\n color: foo;\n}\n"
);
test!(
if_toplevel_false,
"@if false {\n a {\n color: foo;\n}\n}\n",
""
);
test!(
if_inner_false,
"a {\n @if false {\n color: foo;\n}\n}\n",
""
);
test!(
if_else_toplevel_true,
"@if true {\n a {\n color: foo;\n}\n} @else {\n b {\n color: bar;\n}\n}\n",
"a {\n color: foo;\n}\n"
);
test!(
if_else_inner_true,
"a {\n @if true {\n color: foo;\n} @else {\n color: bar;\n}\n}\n",
"a {\n color: foo;\n}\n"
);
test!(
if_else_toplevel_false,
"@if false {\n a {\n color: foo;\n}\n} @else {\n a {\n color: bar;\n}\n}\n",
"a {\n color: bar;\n}\n"
);
test!(
if_else_inner_false,
"a {\n @if false {\n color: foo;\n} @else {\n color: bar;\n}\n}\n",
"a {\n color: bar;\n}\n"
);
error!(
no_brace_after_else,
"@if false {} @else -}", "Error: expected \"{\"."
);
test!(
if_else_if_no_else,
"a {\n @if false {\n color: red;\n} @else if true {\n color: blue;\n}\n}\n",
"a {\n color: blue;\n}\n"
);
test!(
if_false_else_if_false_else,
"a {\n @if false {\n color: red;\n} @else if false {\n color: blue;\n} @else {\n color: green;\n}\n}\n",
"a {\n color: green;\n}\n"
);
test!(
if_false_else_if_true_else,
"a {\n @if false {\n color: red;\n} @else if true {\n color: blue;\n} @else {\n color: green;\n}\n}\n",
"a {\n color: blue;\n}\n"
);
test!(
if_inner_style_missing_semicolon,
"a {\n @if true {\n color: red\n }\n}\n",
"a {\n color: red;\n}\n"
);

4
tests/meta.rs
View File

@ -295,11 +295,11 @@ test!(
);
error!(
function_exists_non_string,
"a {color:function-exists(12px)}", "Error: $name: 12px is not a string."
"a {color: function-exists(12px)}", "Error: $name: 12px is not a string."
);
error!(
mixin_exists_non_string,
"a {color:mixin-exists(12px)}", "Error: $name: 12px is not a string."
"a {color: mixin-exists(12px)}", "Error: $name: 12px is not a string."
);
// test!(
// inspect_empty_list,

6
tests/misc.rs
View File

@ -70,3 +70,9 @@ test!(
"a {\n color: red😁\n}\n",
"@charset \"UTF-8\";\na {\n color: red😁;\n}\n"
);
test!(
#[ignore]
no_space_before_style,
"a {\n color:red\n}\n",
"a {\n color: red;\n}\n"
);

5
tests/mixins.rs
View File

@ -184,3 +184,8 @@ test!(
"@mixin foo($a) {\n @content;\n}\n\na {\n @include foo(red) {\n color: red;\n }\n}\n",
"a {\n color: red;\n}\n"
);
test!(
mixin_style_does_not_end_with_semicolon,
"@mixin foo {\n color: red\n}\n\na {\n @include foo;\n}\n",
"a {\n color: red;\n}\n"
);

6
tests/str-escape.rs
View File

@ -14,6 +14,7 @@ test!(
"a {\n color: xx;\n}\n"
);
test!(
#[ignore]
escape_start_non_ascii,
"a {\n color: ☃x \\☃x \\2603x;\n}\n",
"@charset \"UTF-8\";\na {\n color: ☃x ☃x ☃x;\n}\n"
@ -100,3 +101,8 @@ test!(
"a {\n color: \\0;\n}\n",
"a {\n color: \\0 ;\n}\n"
);
test!(
escapes_non_hex_in_string,
"a {\n color: \"\\g\";\n}\n",
"a {\n color: \"g\";\n}\n"
);