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simplify parsing of @ for to/through

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This commit is contained in:
ConnorSkees 2020-04-26 22:35:06 -04:00
parent 80dfc161b2
commit 003bd87caf
1 changed files with 19 additions and 53 deletions
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70
src/atrule/for_rule.rs
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@ -14,7 +14,8 @@ use crate::scope::Scope;
use crate::selector::Selector;
use crate::unit::Unit;
use crate::utils::{
devour_whitespace, eat_ident, read_until_closing_curly_brace, read_until_open_curly_brace,
devour_whitespace, eat_ident, peek_ident_no_interpolation, read_until_closing_curly_brace,
read_until_open_curly_brace,
};
use crate::value::{Number, Value};
use crate::{Stmt, Token};
@ -80,69 +81,34 @@ pub(crate) fn parse_for<I: Iterator<Item = Token>>(
devour_whitespace(toks);
let mut from_toks = Vec::new();
let mut through = 0;
while let Some(tok) = toks.next() {
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;
}
while let Some(tok) = toks.peek() {
match tok.kind {
't' | 'T' | '\\' => {
let ident = peek_ident_no_interpolation(toks, false)?;
match ident.node.to_ascii_lowercase().as_str() {
"through" => {
through = 1;
// todo: it should take more if there were escapes
toks.take(7).for_each(drop);
break;
}
'o' => {
if toks.peek().unwrap().kind.is_whitespace() {
"to" => {
// todo: it should take more if there were escapes
toks.take(2).for_each(drop);
break;
} else {
from_toks.extend(these_toks);
}
}
_ => {
from_toks.extend(these_toks);
return Err(("Invalid flag name.", ident.span).into());
}
}
}
'{' => {
return Err(("Expected \"to\" or \"through\".", tok.pos()).into());
}
_ => from_toks.extend(these_toks),
_ => from_toks.push(toks.next().unwrap()),
}
}
devour_whitespace(toks);
let from_val = Value::from_vec(from_toks, scope, super_selector)?;
let from = match from_val.node {
Value::Dimension(n, _) => match n.to_integer().to_usize() {
@ -151,13 +117,13 @@ pub(crate) fn parse_for<I: Iterator<Item = Token>>(
},
v => {
return Err((
format!("{} is not an integer.", v.to_css_string(from_val.span)?),
format!("{} is not an integer.", v.inspect(from_val.span)?),
from_val.span,
)
.into())
}
};
devour_whitespace(toks);
let to_toks = read_until_open_curly_brace(toks);
toks.next();
let to_val = Value::from_vec(to_toks, scope, super_selector)?;