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Record first and last token type of custom property values.

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This commit is contained in:
Simon Sapin 2015-09-09 20:47:49 +02:00
parent b8fd51e940
commit 81dd1ab363
7 changed files with 129 additions and 90 deletions
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145
components/style/custom_properties.rs
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@ -2,12 +2,13 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use cssparser::{Parser, Token, SourcePosition, Delimiter};
use cssparser::{Parser, Token, SourcePosition, Delimiter, TokenSerializationType};
use properties::DeclaredValue;
use std::ascii::AsciiExt;
use std::collections::{HashMap, HashSet};
use std::sync::Arc;
use string_cache::Atom;
use util::mem::HeapSizeOf;
// Does not include the `--` prefix
pub type Name = Atom;
@ -22,38 +23,51 @@ pub fn parse_name(s: &str) -> Result<Name, ()> {
}
#[derive(Clone, PartialEq)]
pub struct Value {
/// In CSS syntax
value: String,
pub struct SpecifiedValue {
css: String,
first_token: TokenSerializationType,
last_token: TokenSerializationType,
/// Custom property names in var() functions.
references: HashSet<Name>,
}
pub struct BorrowedValue<'a> {
value: &'a str,
pub struct BorrowedSpecifiedValue<'a> {
css: &'a str,
first_token: TokenSerializationType,
last_token: TokenSerializationType,
references: Option<&'a HashSet<Name>>,
}
pub fn parse(input: &mut Parser) -> Result<Value, ()> {
#[derive(Clone, HeapSizeOf)]
pub struct ComputedValue {
css: String,
first_token: TokenSerializationType,
last_token: TokenSerializationType,
}
pub type ComputedValuesMap = HashMap<Name, ComputedValue>;
pub fn parse(input: &mut Parser) -> Result<SpecifiedValue, ()> {
let start = input.position();
let mut references = Some(HashSet::new());
try!(parse_declaration_value(input, &mut references));
Ok(Value {
value: input.slice_from(start).to_owned(),
let (first_token, last_token) = try!(parse_declaration_value(input, &mut references));
Ok(SpecifiedValue {
css: input.slice_from(start).to_owned(),
first_token: first_token,
last_token: last_token,
references: references.unwrap(),
})
}
/// https://drafts.csswg.org/css-syntax-3/#typedef-declaration-value
pub fn parse_declaration_value(input: &mut Parser, references: &mut Option<HashSet<Name>>)
-> Result<(), ()> {
-> Result<(TokenSerializationType, TokenSerializationType), ()> {
input.parse_until_before(Delimiter::Bang | Delimiter::Semicolon, |input| {
// Need at least one token
let start_position = input.position();
if input.next_including_whitespace().is_err() {
return Err(())
}
try!(input.next_including_whitespace());
input.reset(start_position);
parse_declaration_value_block(input, references)
@ -63,8 +77,16 @@ pub fn parse_declaration_value(input: &mut Parser, references: &mut Option<HashS
/// Like parse_declaration_value,
/// but accept `!` and `;` since they are only invalid at the top level
fn parse_declaration_value_block(input: &mut Parser, references: &mut Option<HashSet<Name>>)
-> Result<(), ()> {
while let Ok(token) = input.next() {
-> Result<(TokenSerializationType, TokenSerializationType), ()> {
let mut first_token_type = TokenSerializationType::nothing();
let mut last_token_type = TokenSerializationType::nothing();
while let Ok(token) = input.next_including_whitespace_and_comments() {
first_token_type.set_if_nothing(token.serialization_type());
// This may be OpenParen when it should be Other (for the closing paren)
// but that doesn’t make a difference since OpenParen is only special
// when it comes *after* an identifier (it would turn into a function)
// but a "last" token will only be concantenated *before* another unrelated token.
last_token_type = token.serialization_type();
match token {
Token::BadUrl |
Token::BadString |
@ -92,7 +114,7 @@ fn parse_declaration_value_block(input: &mut Parser, references: &mut Option<Has
_ => {}
}
}
Ok(())
Ok((first_token_type, last_token_type))
}
// If the var function is valid, return Ok((custom_property_name, fallback))
@ -111,30 +133,37 @@ fn parse_var_function<'i, 't>(input: &mut Parser<'i, 't>, references: &mut Optio
/// Add one custom property declaration to a map,
/// unless another with the same name was already there.
pub fn cascade<'a>(custom_properties: &mut Option<HashMap<&'a Name, BorrowedValue<'a>>>,
inherited: &'a Option<Arc<HashMap<Name, String>>>,
pub fn cascade<'a>(custom_properties: &mut Option<HashMap<&'a Name, BorrowedSpecifiedValue<'a>>>,
inherited: &'a Option<Arc<HashMap<Name, ComputedValue>>>,
seen: &mut HashSet<&'a Name>,
name: &'a Name,
value: &'a DeclaredValue<Value>) {
specified_value: &'a DeclaredValue<SpecifiedValue>) {
let was_not_already_present = seen.insert(name);
if was_not_already_present {
let map = match *custom_properties {
Some(ref mut map) => map,
None => {
*custom_properties = Some(match *inherited {
Some(ref inherited) => inherited.iter().map(|(key, value)| {
(key, BorrowedValue { value: &value, references: None })
Some(ref inherited) => inherited.iter().map(|(key, inherited_value)| {
(key, BorrowedSpecifiedValue {
css: &inherited_value.css,
first_token: inherited_value.first_token,
last_token: inherited_value.last_token,
references: None
})
}).collect(),
None => HashMap::new(),
});
custom_properties.as_mut().unwrap()
}
};
match *value {
DeclaredValue::Value(ref value) => {
map.insert(name, BorrowedValue {
value: &value.value,
references: Some(&value.references),
match *specified_value {
DeclaredValue::Value(ref specified_value) => {
map.insert(name, BorrowedSpecifiedValue {
css: &specified_value.css,
first_token: specified_value.first_token,
last_token: specified_value.last_token,
references: Some(&specified_value.references),
});
},
DeclaredValue::WithVariables { .. } => unreachable!(),
@ -146,9 +175,9 @@ pub fn cascade<'a>(custom_properties: &mut Option<HashMap<&'a Name, BorrowedValu
}
}
pub fn finish_cascade(custom_properties: Option<HashMap<&Name, BorrowedValue>>,
inherited: &Option<Arc<HashMap<Name, String>>>)
-> Option<Arc<HashMap<Name, String>>> {
pub fn finish_cascade(custom_properties: Option<HashMap<&Name, BorrowedSpecifiedValue>>,
inherited: &Option<Arc<HashMap<Name, ComputedValue>>>)
-> Option<Arc<HashMap<Name, ComputedValue>>> {
if let Some(mut map) = custom_properties {
remove_cycles(&mut map);
Some(Arc::new(substitute_all(map, inherited)))
@ -159,7 +188,7 @@ pub fn finish_cascade(custom_properties: Option<HashMap<&Name, BorrowedValue>>,
/// https://drafts.csswg.org/css-variables/#cycles
/// The initial value of a custom property is represented by this property not being in the map.
fn remove_cycles(map: &mut HashMap<&Name, BorrowedValue>) {
fn remove_cycles(map: &mut HashMap<&Name, BorrowedSpecifiedValue>) {
let mut to_remove = HashSet::new();
{
let mut visited = HashSet::new();
@ -167,7 +196,7 @@ fn remove_cycles(map: &mut HashMap<&Name, BorrowedValue>) {
for name in map.keys() {
walk(map, name, &mut stack, &mut visited, &mut to_remove);
fn walk<'a>(map: &HashMap<&'a Name, BorrowedValue<'a>>,
fn walk<'a>(map: &HashMap<&'a Name, BorrowedSpecifiedValue<'a>>,
name: &'a Name,
stack: &mut Vec<&'a Name>,
visited: &mut HashSet<&'a Name>,
@ -201,9 +230,9 @@ fn remove_cycles(map: &mut HashMap<&Name, BorrowedValue>) {
}
/// Replace `var()` functions for all custom properties.
fn substitute_all(custom_properties: HashMap<&Name, BorrowedValue>,
inherited: &Option<Arc<HashMap<Name, String>>>)
-> HashMap<Name, String> {
fn substitute_all(custom_properties: HashMap<&Name, BorrowedSpecifiedValue>,
inherited: &Option<Arc<HashMap<Name, ComputedValue>>>)
-> HashMap<Name, ComputedValue> {
let mut substituted_map = HashMap::new();
let mut invalid = HashSet::new();
for (&name, value) in &custom_properties {
@ -219,16 +248,16 @@ fn substitute_all(custom_properties: HashMap<&Name, BorrowedValue>,
/// Also recursively record results for other custom properties referenced by `var()` functions.
/// Return `Err(())` for invalid at computed time.
fn substitute_one(name: &Name,
value: &BorrowedValue,
custom_properties: &HashMap<&Name, BorrowedValue>,
inherited: &Option<Arc<HashMap<Name, String>>>,
specified_value: &BorrowedSpecifiedValue,
custom_properties: &HashMap<&Name, BorrowedSpecifiedValue>,
inherited: &Option<Arc<HashMap<Name, ComputedValue>>>,
substituted: Option<&mut String>,
substituted_map: &mut HashMap<Name, String>,
substituted_map: &mut HashMap<Name, ComputedValue>,
invalid: &mut HashSet<Name>)
-> Result<(), ()> {
if let Some(value) = substituted_map.get(name) {
if let Some(computed_value) = substituted_map.get(name) {
if let Some(substituted) = substituted {
substituted.push_str(value)
substituted.push_str(&computed_value.css)
}
return Ok(())
}
@ -236,36 +265,46 @@ fn substitute_one(name: &Name,
if invalid.contains(name) {
return Err(());
}
let value = if value.references.map(|set| set.is_empty()) == Some(false) {
let computed_value = if specified_value.references.map(|set| set.is_empty()) == Some(false) {
let mut substituted = String::new();
let mut input = Parser::new(&value.value);
let mut input = Parser::new(&specified_value.css);
let mut start = input.position();
if substitute_block(&mut input, &mut start, &mut substituted, &mut |name, substituted| {
if let Some(value) = custom_properties.get(name) {
substitute_one(name, value, custom_properties, inherited,
if let Some(other_specified_value) = custom_properties.get(name) {
substitute_one(name, other_specified_value, custom_properties, inherited,
Some(substituted), substituted_map, invalid)
} else {
Err(())
}
}).is_ok() {
substituted.push_str(input.slice_from(start));
substituted
ComputedValue {
css: substituted,
// FIXME: what if these are `var(` or the corresponding `)`?
first_token: specified_value.first_token,
last_token: specified_value.last_token,
}
} else {
// Invalid at computed-value time. Use the inherited value.
if let Some(value) = inherited.as_ref().and_then(|i| i.get(name)) {
value.clone()
if let Some(inherited_value) = inherited.as_ref().and_then(|i| i.get(name)) {
inherited_value.clone()
} else {
invalid.insert(name.clone());
return Err(())
}
}
} else {
value.value.to_owned()
// The specified value contains no var() reference
ComputedValue {
css: specified_value.css.to_owned(),
first_token: specified_value.first_token,
last_token: specified_value.last_token,
}
};
if let Some(substituted) = substituted {
substituted.push_str(&value)
substituted.push_str(&computed_value.css)
}
substituted_map.insert(name.clone(), value);
substituted_map.insert(name.clone(), computed_value);
Ok(())
}
@ -334,7 +373,7 @@ fn substitute_block<F>(input: &mut Parser,
/// Replace `var()` functions for a non-custom property.
/// Return `Err(())` for invalid at computed time.
pub fn substitute(input: &str, custom_properties: &Option<Arc<HashMap<Name, String>>>)
pub fn substitute(input: &str, custom_properties: &Option<Arc<HashMap<Name, ComputedValue>>>)
-> Result<String, ()> {
let empty_map;
let custom_properties = if let &Some(ref arc) = custom_properties {
@ -348,7 +387,7 @@ pub fn substitute(input: &str, custom_properties: &Option<Arc<HashMap<Name, Stri
let mut start = input.position();
try!(substitute_block(&mut input, &mut start, &mut substituted, &mut |name, substituted| {
if let Some(value) = custom_properties.get(name) {
substituted.push_str(value);
substituted.push_str(&value.css);
Ok(())
} else {
Err(())