763 lines
28 KiB
Rust
763 lines
28 KiB
Rust
/*! # grass
|
|
An implementation of the sass specification in pure rust.
|
|
|
|
All functionality is currently exposed through [`StyleSheet`].
|
|
|
|
Spec progress as of 2020-04-21:
|
|
|
|
| Passing | Failing | Total |
|
|
|---------|---------|-------|
|
|
| 2150 | 2943 | 5093 |
|
|
|
|
## Use as library
|
|
```
|
|
use grass::{SassResult, StyleSheet};
|
|
|
|
fn main() -> SassResult<()> {
|
|
let sass = StyleSheet::new("a { b { color: &; } }".to_string())?;
|
|
assert_eq!(sass, "a b {\n color: a b;\n}\n");
|
|
Ok(())
|
|
}
|
|
```
|
|
|
|
## Use as binary
|
|
```bash
|
|
cargo install grass
|
|
grass input.scss
|
|
```
|
|
*/
|
|
|
|
#![warn(
|
|
clippy::all,
|
|
clippy::restriction,
|
|
clippy::pedantic,
|
|
clippy::nursery,
|
|
clippy::cargo
|
|
)]
|
|
#![deny(missing_debug_implementations)]
|
|
#![allow(
|
|
// explicit return makes some things look ugly
|
|
clippy::implicit_return,
|
|
// Self { .. } is less explicit than Foo { .. }
|
|
clippy::use_self,
|
|
// this is way too pedantic -- some things don't need docs!
|
|
clippy::missing_docs_in_private_items,
|
|
// unreachable!() has many valid use cases
|
|
clippy::unreachable,
|
|
// _ => {} has many valid use cases
|
|
clippy::wildcard_enum_match_arm,
|
|
// .expect() has many valid use cases, like when we know a value is `Some(..)`
|
|
clippy::option_expect_used,
|
|
// this is too pedantic -- we are allowed to add numbers!
|
|
clippy::integer_arithmetic,
|
|
// this is too pedantic for now -- the library is changing too quickly for
|
|
// good docs to be written
|
|
clippy::missing_errors_doc,
|
|
// this incorrectly results in errors for types that derive `Debug`
|
|
// https://github.com/rust-lang/rust-clippy/issues/4980
|
|
clippy::let_underscore_must_use,
|
|
// this is too pedantic -- it results in some names being less explicit
|
|
// than they should
|
|
clippy::module_name_repetitions,
|
|
// this is too pedantic -- it is sometimes useful to break up `impl`s
|
|
clippy::multiple_inherent_impl,
|
|
|
|
// temporarily allowed while under heavy development.
|
|
// eventually these allows should be refactored away
|
|
// to no longer be necessary
|
|
clippy::as_conversions,
|
|
clippy::todo,
|
|
clippy::too_many_lines,
|
|
clippy::panic,
|
|
clippy::option_unwrap_used,
|
|
clippy::result_unwrap_used,
|
|
clippy::result_expect_used,
|
|
clippy::cast_possible_truncation,
|
|
clippy::single_match_else,
|
|
clippy::indexing_slicing,
|
|
clippy::match_same_arms,
|
|
clippy::or_fun_call,
|
|
clippy::redundant_pub_crate,
|
|
)]
|
|
#![cfg_attr(feature = "nightly", feature(track_caller))]
|
|
use std::fs;
|
|
use std::iter::Iterator;
|
|
use std::path::Path;
|
|
|
|
use codemap::{CodeMap, Span, Spanned};
|
|
|
|
use peekmore::{PeekMore, PeekMoreIterator};
|
|
|
|
#[cfg(feature = "wasm")]
|
|
use wasm_bindgen::prelude::*;
|
|
|
|
use crate::atrule::{eat_include, AtRule, AtRuleKind, Function, Mixin};
|
|
pub use crate::error::{SassError, SassResult};
|
|
use crate::imports::import;
|
|
use crate::lexer::Lexer;
|
|
use crate::output::Css;
|
|
use crate::scope::{
|
|
global_var_exists, insert_global_fn, insert_global_mixin, insert_global_var, Scope,
|
|
GLOBAL_SCOPE,
|
|
};
|
|
use crate::selector::Selector;
|
|
use crate::style::Style;
|
|
pub(crate) use crate::token::Token;
|
|
use crate::utils::{
|
|
devour_whitespace, eat_comment, eat_ident, eat_ident_no_interpolation, eat_variable_value,
|
|
parse_quoted_string, read_until_closing_curly_brace, read_until_closing_paren,
|
|
read_until_newline, VariableDecl,
|
|
};
|
|
use crate::value::Value;
|
|
|
|
mod args;
|
|
mod atrule;
|
|
mod builtin;
|
|
mod color;
|
|
mod common;
|
|
mod error;
|
|
mod imports;
|
|
mod lexer;
|
|
mod output;
|
|
mod scope;
|
|
mod selector;
|
|
mod style;
|
|
mod token;
|
|
mod unit;
|
|
mod utils;
|
|
mod value;
|
|
|
|
/// Represents a parsed SASS stylesheet with nesting
|
|
#[cfg_attr(feature = "wasm", wasm_bindgen)]
|
|
#[derive(Debug, Clone)]
|
|
pub struct StyleSheet(Vec<Spanned<Stmt>>);
|
|
|
|
#[derive(Clone, Debug)]
|
|
pub(crate) enum Stmt {
|
|
/// A [`Style`](/grass/style/struct.Style)
|
|
Style(Box<Style>),
|
|
/// A [`RuleSet`](/grass/struct.RuleSet.html)
|
|
RuleSet(RuleSet),
|
|
/// A multiline comment: `/* foo bar */`
|
|
MultilineComment(String),
|
|
/// A CSS rule: `@charset "UTF-8";`
|
|
AtRule(AtRule),
|
|
}
|
|
|
|
impl Stmt {
|
|
const fn span(self, span: Span) -> Spanned<Self> {
|
|
Spanned { node: self, span }
|
|
}
|
|
}
|
|
|
|
/// Represents a single rule set. Rule sets can contain other rule sets
|
|
///
|
|
/// ```scss
|
|
/// a {
|
|
/// color: blue;
|
|
/// b {
|
|
/// color: red;
|
|
/// }
|
|
/// }
|
|
/// ```
|
|
#[derive(Clone, Debug)]
|
|
pub(crate) struct RuleSet {
|
|
selector: Selector,
|
|
rules: Vec<Spanned<Stmt>>,
|
|
// potential optimization: we don't *need* to own the selector
|
|
super_selector: Selector,
|
|
}
|
|
|
|
/// An intermediate representation of what are essentially single lines
|
|
/// todo! rename this
|
|
#[derive(Clone, Debug)]
|
|
enum Expr {
|
|
/// A style: `color: red`
|
|
Style(Box<Style>),
|
|
/// Several styles
|
|
Styles(Vec<Style>),
|
|
/// A full selector `a > h1`
|
|
Selector(Selector),
|
|
/// A variable declaration `$var: 1px`
|
|
VariableDecl(String, Box<Spanned<Value>>),
|
|
/// A mixin declaration `@mixin foo {}`
|
|
MixinDecl(String, Box<Mixin>),
|
|
FunctionDecl(String, Box<Function>),
|
|
/// A multiline comment: `/* foobar */`
|
|
MultilineComment(String),
|
|
AtRule(AtRule),
|
|
}
|
|
|
|
fn raw_to_parse_error(map: &CodeMap, err: SassError) -> SassError {
|
|
let (message, span) = err.raw();
|
|
SassError::from_loc(message, map.look_up_span(span))
|
|
}
|
|
|
|
#[cfg(feature = "wasm")]
|
|
#[wasm_bindgen]
|
|
impl StyleSheet {
|
|
pub fn new(input: String) -> Result<String, JsValue> {
|
|
let mut map = CodeMap::new();
|
|
let file = map.add_file("stdin".into(), input);
|
|
Ok(Css::from_stylesheet(StyleSheet(
|
|
StyleSheetParser {
|
|
lexer: Lexer::new(&file).peekmore(),
|
|
nesting: 0,
|
|
map: &map,
|
|
path: Path::new(""),
|
|
}
|
|
.parse_toplevel()
|
|
.map_err(|e| raw_to_parse_error(&map, e).to_string())?
|
|
.0,
|
|
))
|
|
.map_err(|e| raw_to_parse_error(&map, e).to_string())?
|
|
.pretty_print()
|
|
.map_err(|e| raw_to_parse_error(&map, e).to_string())?)
|
|
}
|
|
}
|
|
|
|
impl StyleSheet {
|
|
/// Write CSS to `buf`, constructed from a string
|
|
///
|
|
/// ```
|
|
/// use grass::{SassResult, StyleSheet};
|
|
///
|
|
/// fn main() -> SassResult<()> {
|
|
/// let sass = StyleSheet::new("a { b { color: red; } }".to_string())?;
|
|
/// assert_eq!(sass, "a b {\n color: red;\n}\n");
|
|
/// Ok(())
|
|
/// }
|
|
/// ```
|
|
#[inline]
|
|
#[cfg(not(feature = "wasm"))]
|
|
pub fn new(input: String) -> SassResult<String> {
|
|
let mut map = CodeMap::new();
|
|
let file = map.add_file("stdin".into(), input);
|
|
Css::from_stylesheet(StyleSheet(
|
|
StyleSheetParser {
|
|
lexer: Lexer::new(&file).peekmore(),
|
|
nesting: 0,
|
|
map: &mut map,
|
|
path: Path::new(""),
|
|
}
|
|
.parse_toplevel()
|
|
.map_err(|e| raw_to_parse_error(&map, e))?
|
|
.0,
|
|
))
|
|
.map_err(|e| raw_to_parse_error(&map, e))?
|
|
.pretty_print(&map)
|
|
.map_err(|e| raw_to_parse_error(&map, e))
|
|
}
|
|
|
|
/// Write CSS to `buf`, constructed from a path
|
|
///
|
|
/// ```
|
|
/// use grass::{SassResult, StyleSheet};
|
|
///
|
|
/// fn main() -> SassResult<()> {
|
|
/// let sass = StyleSheet::from_path("input.scss")?;
|
|
/// Ok(())
|
|
/// }
|
|
/// ```
|
|
#[inline]
|
|
#[cfg(not(feature = "wasm"))]
|
|
pub fn from_path<P: AsRef<Path> + Into<String> + Clone>(p: P) -> SassResult<String> {
|
|
let mut map = CodeMap::new();
|
|
let file = map.add_file(p.clone().into(), String::from_utf8(fs::read(p.clone())?)?);
|
|
Css::from_stylesheet(StyleSheet(
|
|
StyleSheetParser {
|
|
lexer: Lexer::new(&file).peekmore(),
|
|
nesting: 0,
|
|
map: &mut map,
|
|
path: p.as_ref(),
|
|
}
|
|
.parse_toplevel()
|
|
.map_err(|e| raw_to_parse_error(&map, e))?
|
|
.0,
|
|
))
|
|
.map_err(|e| raw_to_parse_error(&map, e))?
|
|
.pretty_print(&map)
|
|
.map_err(|e| raw_to_parse_error(&map, e))
|
|
}
|
|
|
|
pub(crate) fn export_from_path<P: AsRef<Path> + Into<String> + Clone>(
|
|
p: &P,
|
|
map: &mut CodeMap,
|
|
) -> SassResult<(Vec<Spanned<Stmt>>, Scope)> {
|
|
let file = map.add_file(p.clone().into(), String::from_utf8(fs::read(p)?)?);
|
|
Ok(StyleSheetParser {
|
|
lexer: Lexer::new(&file).peekmore(),
|
|
nesting: 0,
|
|
map,
|
|
path: p.as_ref(),
|
|
}
|
|
.parse_toplevel()?)
|
|
}
|
|
|
|
pub(crate) fn from_stmts(s: Vec<Spanned<Stmt>>) -> StyleSheet {
|
|
StyleSheet(s)
|
|
}
|
|
}
|
|
|
|
struct StyleSheetParser<'a> {
|
|
lexer: PeekMoreIterator<Lexer<'a>>,
|
|
nesting: u32,
|
|
map: &'a mut CodeMap,
|
|
path: &'a Path,
|
|
}
|
|
|
|
impl<'a> StyleSheetParser<'a> {
|
|
fn parse_toplevel(mut self) -> SassResult<(Vec<Spanned<Stmt>>, Scope)> {
|
|
let mut rules: Vec<Spanned<Stmt>> = Vec::new();
|
|
while let Some(Token { kind, .. }) = self.lexer.peek() {
|
|
match kind {
|
|
'a'..='z' | 'A'..='Z' | '_' | '-' | '0'..='9'
|
|
| '[' | '#' | ':' | '*' | '%' | '.' | '>' => rules
|
|
.extend(self.eat_rules(&Selector::new(), &mut Scope::new())?),
|
|
&'\t' | &'\n' | ' ' => {
|
|
self.lexer.next();
|
|
continue;
|
|
}
|
|
'$' => {
|
|
self.lexer.next();
|
|
let name = eat_ident(&mut self.lexer, &Scope::new(), &Selector::new())?;
|
|
devour_whitespace(&mut self.lexer);
|
|
let Token { kind, pos } = self
|
|
.lexer
|
|
.next()
|
|
.unwrap();
|
|
if kind != ':' {
|
|
return Err(("expected \":\".", pos).into());
|
|
}
|
|
let VariableDecl { val, default, .. } =
|
|
eat_variable_value(&mut self.lexer, &Scope::new(), &Selector::new())?;
|
|
if !(default && global_var_exists(&name)) {
|
|
insert_global_var(&name.node, val)?;
|
|
}
|
|
}
|
|
'/' => {
|
|
self.lexer.next();
|
|
if '*' == self.lexer.peek().unwrap().kind {
|
|
self.lexer.next();
|
|
let comment = eat_comment(&mut self.lexer, &Scope::new(), &Selector::new())?;
|
|
rules.push(comment.map_node(Stmt::MultilineComment));
|
|
} else if '/' == self.lexer.peek().unwrap().kind {
|
|
read_until_newline(&mut self.lexer);
|
|
devour_whitespace(&mut self.lexer);
|
|
} else {
|
|
todo!()
|
|
}
|
|
}
|
|
'@' => {
|
|
self.lexer.next();
|
|
let Spanned { node: at_rule_kind, span } = eat_ident(&mut self.lexer, &Scope::new(), &Selector::new())?;
|
|
if at_rule_kind.is_empty() {
|
|
return Err(("Expected identifier.", span).into());
|
|
}
|
|
match AtRuleKind::from(at_rule_kind.as_str()) {
|
|
AtRuleKind::Include => rules.extend(eat_include(
|
|
&mut self.lexer,
|
|
&Scope::new(),
|
|
&Selector::new(),
|
|
)?),
|
|
AtRuleKind::Import => {
|
|
devour_whitespace(&mut self.lexer);
|
|
let mut file_name = String::new();
|
|
let next = match self.lexer.next() {
|
|
Some(v) => v,
|
|
None => todo!("expected input after @import")
|
|
};
|
|
match next.kind {
|
|
q @ '"' | q @ '\'' => {
|
|
file_name.push_str(
|
|
&parse_quoted_string(
|
|
&mut self.lexer,
|
|
&Scope::new(),
|
|
q,
|
|
&Selector::new())?
|
|
.node.unquote().to_css_string(span)?);
|
|
}
|
|
_ => return Err(("Expected string.", next.pos()).into()),
|
|
}
|
|
if let Some(t) = self.lexer.peek() {
|
|
if t.kind == ';' {
|
|
self.lexer.next();
|
|
}
|
|
}
|
|
|
|
devour_whitespace(&mut self.lexer);
|
|
|
|
let (new_rules, new_scope) = import(self.path, file_name.as_ref(), &mut self.map)?;
|
|
rules.extend(new_rules);
|
|
GLOBAL_SCOPE.with(|s| {
|
|
s.borrow_mut().extend(new_scope);
|
|
});
|
|
}
|
|
v => {
|
|
let rule = AtRule::from_tokens(&v, span, &mut self.lexer, &mut Scope::new(), &Selector::new())?;
|
|
match rule.node {
|
|
AtRule::Mixin(name, mixin) => {
|
|
insert_global_mixin(&name, *mixin);
|
|
}
|
|
AtRule::Function(name, func) => {
|
|
insert_global_fn(&name, *func);
|
|
}
|
|
AtRule::Charset => continue,
|
|
AtRule::Warn(message) => self.warn(rule.span, &message),
|
|
AtRule::Debug(message) => self.debug(rule.span, &message),
|
|
AtRule::Return(_) => {
|
|
return Err(
|
|
("This at-rule is not allowed here.", rule.span).into()
|
|
)
|
|
}
|
|
AtRule::For(f) => rules.extend(f.ruleset_eval(&mut Scope::new(), &Selector::new())?),
|
|
AtRule::While(w) => rules.extend(w.ruleset_eval(&mut Scope::new(), &Selector::new(), true)?),
|
|
AtRule::Each(e) => {
|
|
rules.extend(e.ruleset_eval(&mut Scope::new(), &Selector::new())?)
|
|
}
|
|
AtRule::Include(s) => rules.extend(s),
|
|
AtRule::Content => return Err(
|
|
("@content is only allowed within mixin declarations.", rule.span
|
|
).into()),
|
|
AtRule::If(i) => {
|
|
rules.extend(i.eval(&mut Scope::new(), &Selector::new())?);
|
|
}
|
|
AtRule::AtRoot(root_rules) => rules.extend(root_rules),
|
|
AtRule::Unknown(..) => rules.push(rule.map_node(Stmt::AtRule)),
|
|
}
|
|
}
|
|
}
|
|
},
|
|
'&' => {
|
|
return Err(
|
|
("Base-level rules cannot contain the parent-selector-referencing character '&'.", self.lexer.next().unwrap().pos()).into(),
|
|
)
|
|
}
|
|
c if c.is_control() => {
|
|
return Err(("expected selector.", self.lexer.next().unwrap().pos()).into());
|
|
}
|
|
_ => match dbg!(self.lexer.next()) {
|
|
Some(..) => todo!("unexpected toplevel token"),
|
|
_ => unsafe { std::hint::unreachable_unchecked() },
|
|
}
|
|
};
|
|
}
|
|
Ok((rules, GLOBAL_SCOPE.with(|s| s.borrow().clone())))
|
|
}
|
|
|
|
fn eat_rules(
|
|
&mut self,
|
|
super_selector: &Selector,
|
|
scope: &mut Scope,
|
|
) -> SassResult<Vec<Spanned<Stmt>>> {
|
|
let mut stmts = Vec::new();
|
|
while let Some(expr) = eat_expr(&mut self.lexer, scope, super_selector)? {
|
|
let span = expr.span;
|
|
match expr.node {
|
|
Expr::Style(s) => stmts.push(Spanned {
|
|
node: Stmt::Style(s),
|
|
span,
|
|
}),
|
|
Expr::AtRule(a) => match a {
|
|
AtRule::For(f) => stmts.extend(f.ruleset_eval(scope, super_selector)?),
|
|
AtRule::While(w) => {
|
|
stmts.extend(w.ruleset_eval(scope, super_selector, false)?)
|
|
}
|
|
AtRule::Each(e) => stmts.extend(e.ruleset_eval(scope, super_selector)?),
|
|
AtRule::Include(s) => stmts.extend(s),
|
|
AtRule::If(i) => stmts.extend(i.eval(scope, super_selector)?),
|
|
AtRule::Content => {
|
|
return Err((
|
|
"@content is only allowed within mixin declarations.",
|
|
expr.span,
|
|
)
|
|
.into())
|
|
}
|
|
AtRule::Return(..) => {
|
|
return Err(("This at-rule is not allowed here.", expr.span).into())
|
|
}
|
|
AtRule::AtRoot(root_stmts) => stmts.extend(root_stmts),
|
|
AtRule::Debug(ref message) => self.debug(expr.span, message),
|
|
AtRule::Warn(ref message) => self.warn(expr.span, message),
|
|
AtRule::Mixin(..) | AtRule::Function(..) => todo!(),
|
|
AtRule::Charset => todo!(),
|
|
r @ AtRule::Unknown(..) => stmts.push(Spanned {
|
|
node: Stmt::AtRule(r),
|
|
span,
|
|
}),
|
|
},
|
|
Expr::Styles(s) => stmts.extend(
|
|
s.into_iter()
|
|
.map(Box::new)
|
|
.map(Stmt::Style)
|
|
.map(|style| Spanned { node: style, span }),
|
|
),
|
|
Expr::MixinDecl(name, mixin) => {
|
|
scope.insert_mixin(&name, *mixin);
|
|
}
|
|
Expr::FunctionDecl(name, func) => {
|
|
scope.insert_fn(&name, *func);
|
|
}
|
|
Expr::Selector(s) => {
|
|
self.nesting += 1;
|
|
let rules = self.eat_rules(&super_selector.zip(&s), scope)?;
|
|
stmts.push(Spanned {
|
|
node: Stmt::RuleSet(RuleSet {
|
|
super_selector: super_selector.clone(),
|
|
selector: s,
|
|
rules,
|
|
}),
|
|
span,
|
|
});
|
|
self.nesting -= 1;
|
|
if self.nesting == 0 {
|
|
return Ok(stmts);
|
|
}
|
|
}
|
|
Expr::VariableDecl(name, val) => {
|
|
if self.nesting == 0 {
|
|
scope.insert_var(&name, *val.clone())?;
|
|
insert_global_var(&name, *val)?;
|
|
} else {
|
|
scope.insert_var(&name, *val)?;
|
|
}
|
|
}
|
|
Expr::MultilineComment(s) => stmts.push(Spanned {
|
|
node: Stmt::MultilineComment(s),
|
|
span,
|
|
}),
|
|
}
|
|
}
|
|
Ok(stmts)
|
|
}
|
|
}
|
|
|
|
pub(crate) fn eat_expr<I: Iterator<Item = Token>>(
|
|
toks: &mut PeekMoreIterator<I>,
|
|
scope: &mut Scope,
|
|
super_selector: &Selector,
|
|
) -> SassResult<Option<Spanned<Expr>>> {
|
|
let mut values = Vec::with_capacity(5);
|
|
let mut span = if let Some(tok) = toks.peek() {
|
|
tok.pos()
|
|
} else {
|
|
return Ok(None);
|
|
};
|
|
while let Some(tok) = toks.peek() {
|
|
span = span.merge(tok.pos());
|
|
match tok.kind {
|
|
':' => {
|
|
let tok = toks.next();
|
|
if devour_whitespace(toks) {
|
|
let prop = Style::parse_property(
|
|
&mut values.into_iter().peekmore(),
|
|
scope,
|
|
super_selector,
|
|
String::new(),
|
|
)?;
|
|
return Ok(Some(Spanned {
|
|
node: Style::from_tokens(toks, scope, super_selector, prop)?,
|
|
span,
|
|
}));
|
|
} else {
|
|
values.push(tok.unwrap());
|
|
}
|
|
}
|
|
';' => {
|
|
toks.next();
|
|
devour_whitespace(toks);
|
|
// special edge case where there was no space between the colon
|
|
// in a style, e.g. `color:red`. todo: refactor
|
|
let mut v = values.into_iter().peekmore();
|
|
devour_whitespace(&mut v);
|
|
if v.peek().is_none() {
|
|
devour_whitespace(toks);
|
|
return Ok(Some(Spanned {
|
|
node: Expr::Style(Box::new(Style {
|
|
property: String::new(),
|
|
value: Value::Null.span(span),
|
|
})),
|
|
span,
|
|
}));
|
|
}
|
|
let property = Style::parse_property(&mut v, scope, super_selector, String::new())?;
|
|
let value = Style::parse_value(&mut v, scope, super_selector)?;
|
|
return Ok(Some(Spanned {
|
|
node: Expr::Style(Box::new(Style { property, value })),
|
|
span,
|
|
}));
|
|
}
|
|
'}' => {
|
|
if values.is_empty() {
|
|
toks.next();
|
|
devour_whitespace(toks);
|
|
if toks.peek().is_some() && toks.peek().unwrap().kind == ';' {
|
|
toks.next();
|
|
}
|
|
devour_whitespace(toks);
|
|
return Ok(None);
|
|
} else {
|
|
// special edge case where there was no space between the colon
|
|
// and no semicolon following the style
|
|
// in a style `color:red`. todo: refactor
|
|
let mut v = values.into_iter().peekmore();
|
|
let property =
|
|
Style::parse_property(&mut v, scope, super_selector, String::new())?;
|
|
let value = Style::parse_value(&mut v, scope, super_selector)?;
|
|
return Ok(Some(Spanned {
|
|
node: Expr::Style(Box::new(Style { property, value })),
|
|
span,
|
|
}));
|
|
}
|
|
}
|
|
'{' => {
|
|
toks.next();
|
|
devour_whitespace(toks);
|
|
return Ok(Some(Spanned {
|
|
node: Expr::Selector(Selector::from_tokens(
|
|
&mut values.into_iter().peekmore(),
|
|
scope,
|
|
super_selector,
|
|
)?),
|
|
span,
|
|
}));
|
|
}
|
|
'$' => {
|
|
let tok = toks.next().unwrap();
|
|
if toks.peek().unwrap().kind == '=' {
|
|
values.push(tok);
|
|
values.push(toks.next().unwrap());
|
|
continue;
|
|
}
|
|
let name = eat_ident_no_interpolation(toks, false)?;
|
|
devour_whitespace(toks);
|
|
if toks.peek().unwrap().kind == ':' {
|
|
toks.next();
|
|
devour_whitespace(toks);
|
|
let VariableDecl {
|
|
val,
|
|
default,
|
|
global,
|
|
} = eat_variable_value(toks, scope, super_selector)?;
|
|
if global {
|
|
insert_global_var(&name.node, val.clone())?;
|
|
}
|
|
let var_exists = scope.var_exists(&name.node);
|
|
if !(default && var_exists) {
|
|
return Ok(Some(Spanned {
|
|
node: Expr::VariableDecl(name.node, Box::new(val)),
|
|
span,
|
|
}));
|
|
}
|
|
if !values.is_empty() {
|
|
todo!()
|
|
}
|
|
} else {
|
|
values.push(tok);
|
|
let mut current_pos = 0;
|
|
values.extend(name.chars().map(|x| {
|
|
let len = x.len_utf8() as u64;
|
|
let tok = Token::new(span.subspan(current_pos, current_pos + len), x);
|
|
current_pos += len;
|
|
tok
|
|
}));
|
|
}
|
|
}
|
|
'/' => {
|
|
let tok = toks.next().unwrap();
|
|
let peeked = toks.peek().ok_or(("expected more input.", tok.pos()))?;
|
|
if peeked.kind == '/' {
|
|
read_until_newline(toks);
|
|
devour_whitespace(toks);
|
|
continue;
|
|
} else if values.is_empty() && peeked.kind == '*' {
|
|
toks.next();
|
|
let comment = eat_comment(toks, scope, super_selector)?;
|
|
devour_whitespace(toks);
|
|
return Ok(Some(Spanned {
|
|
node: Expr::MultilineComment(comment.node),
|
|
span: comment.span,
|
|
}));
|
|
} else {
|
|
values.push(tok);
|
|
}
|
|
}
|
|
'@' => {
|
|
toks.next();
|
|
let Spanned { node: ident, span } = eat_ident(toks, scope, super_selector)?;
|
|
devour_whitespace(toks);
|
|
let rule = AtRule::from_tokens(
|
|
&AtRuleKind::from(ident.as_str()),
|
|
span,
|
|
toks,
|
|
scope,
|
|
super_selector,
|
|
)?;
|
|
return Ok(Some(Spanned {
|
|
node: match rule.node {
|
|
AtRule::Mixin(name, mixin) => Expr::MixinDecl(name, mixin),
|
|
AtRule::Function(name, func) => Expr::FunctionDecl(name, func),
|
|
AtRule::Charset => todo!("@charset as expr"),
|
|
d @ AtRule::Debug(..) => Expr::AtRule(d),
|
|
w @ AtRule::Warn(..) => Expr::AtRule(w),
|
|
a @ AtRule::Return(_) => Expr::AtRule(a),
|
|
c @ AtRule::Content => Expr::AtRule(c),
|
|
f @ AtRule::If(..) => Expr::AtRule(f),
|
|
f @ AtRule::For(..) => Expr::AtRule(f),
|
|
f @ AtRule::While(..) => Expr::AtRule(f),
|
|
f @ AtRule::Each(..) => Expr::AtRule(f),
|
|
u @ AtRule::Unknown(..) => Expr::AtRule(u),
|
|
u @ AtRule::AtRoot(..) => Expr::AtRule(u),
|
|
u @ AtRule::Include(..) => Expr::AtRule(u),
|
|
},
|
|
span,
|
|
}));
|
|
}
|
|
'#' => {
|
|
values.push(toks.next().unwrap());
|
|
if toks.peek().unwrap().kind == '{' {
|
|
values.push(toks.next().unwrap());
|
|
values.extend(read_until_closing_curly_brace(toks));
|
|
values.push(toks.next().unwrap());
|
|
}
|
|
}
|
|
'\\' => {
|
|
values.push(toks.next().unwrap());
|
|
values.push(toks.next().unwrap());
|
|
}
|
|
// todo: this should only apply to special functions
|
|
// it is causing us to emit nothing on malformed input
|
|
'(' => {
|
|
values.push(toks.next().unwrap());
|
|
values.extend(read_until_closing_paren(toks));
|
|
}
|
|
_ => values.push(toks.next().unwrap()),
|
|
};
|
|
}
|
|
Ok(None)
|
|
}
|
|
|
|
/// Functions that print to stdout or stderr
|
|
impl<'a> StyleSheetParser<'a> {
|
|
fn debug(&self, span: Span, message: &str) {
|
|
let loc = self.map.look_up_span(span);
|
|
eprintln!(
|
|
"{}:{} Debug: {}",
|
|
loc.file.name(),
|
|
loc.begin.line + 1,
|
|
message
|
|
);
|
|
}
|
|
|
|
fn warn(&self, span: Span, message: &str) {
|
|
let loc = self.map.look_up_span(span);
|
|
eprintln!(
|
|
"Warning: {}\n {} {}:{} root stylesheet",
|
|
message,
|
|
loc.file.name(),
|
|
loc.begin.line + 1,
|
|
loc.begin.column + 1
|
|
);
|
|
}
|
|
}
|