Auto merge of #200 - servo:location-in-errors, r=SimonSapin

Include a SourceLocation in all error types

This is part of https://bugzilla.mozilla.org/show_bug.cgi?id=1378861

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Author: bors-servo

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cssparser"
-version = "0.21.3"
+version = "0.22.0"
 authors = [ "Simon Sapin <[email protected]>" ]
 
 description = "Rust implementation of CSS Syntax Level 3"

src/color.rs

@@ -150,6 +150,7 @@ impl Color {
     /// FIXME(#2) Deprecated CSS2 System Colors are not supported yet.
     pub fn parse<'i, 't>(input: &mut Parser<'i, 't>) -> Result<Color, BasicParseError<'i>> {
         // FIXME: remove clone() when lifetimes are non-lexical
+        let location = input.current_source_location();
         let token = input.next()?.clone();
         match token {
             Token::Hash(ref value) | Token::IDHash(ref value) => {
@@ -158,12 +159,11 @@ impl Color {
             Token::Ident(ref value) => parse_color_keyword(&*value),
             Token::Function(ref name) => {
                 return input.parse_nested_block(|arguments| {
-                    parse_color_function(&*name, arguments)
-                        .map_err(|e| ParseError::Basic(e))
+                    parse_color_function(&*name, arguments).map_err(|e| e.into())
                 }).map_err(ParseError::<()>::basic);
             }
             _ => Err(())
-        }.map_err(|()| BasicParseError::UnexpectedToken(token))
+        }.map_err(|()| location.new_basic_unexpected_token_error(token))
     }
 
     /// Parse a color hash, without the leading '#' character.
@@ -424,7 +424,7 @@ fn parse_color_function<'i, 't>(name: &str, arguments: &mut Parser<'i, 't>) -> R
     let (red, green, blue, uses_commas) = match_ignore_ascii_case! { name,
         "rgb" | "rgba" => parse_rgb_components_rgb(arguments)?,
         "hsl" | "hsla" => parse_rgb_components_hsl(arguments)?,
-        _ => return Err(BasicParseError::UnexpectedToken(Token::Ident(name.to_owned().into()))),
+        _ => return Err(arguments.new_basic_unexpected_token_error(Token::Ident(name.to_owned().into()))),
     };
 
     let alpha = if !arguments.is_exhausted() {
@@ -433,6 +433,7 @@ fn parse_color_function<'i, 't>(name: &str, arguments: &mut Parser<'i, 't>) -> R
         } else {
             arguments.expect_delim('/')?;
         };
+        let location = arguments.current_source_location();
         match *arguments.next()? {
             Token::Number { value: v, .. } => {
                 clamp_unit_f32(v)
@@ -441,7 +442,7 @@ fn parse_color_function<'i, 't>(name: &str, arguments: &mut Parser<'i, 't>) -> R
                 clamp_unit_f32(v)
             }
             ref t => {
-                return Err(BasicParseError::UnexpectedToken(t.clone()))
+                return Err(location.new_basic_unexpected_token_error(t.clone()))
             }
         }
     } else {
@@ -462,6 +463,8 @@ fn parse_rgb_components_rgb<'i, 't>(arguments: &mut Parser<'i, 't>) -> Result<(u
 
     // Either integers or percentages, but all the same type.
     // https://drafts.csswg.org/css-color/#rgb-functions
+    // FIXME: remove .clone() when lifetimes are non-lexical.
+    let location = arguments.current_source_location();
     match arguments.next()?.clone() {
         Token::Number { value: v, .. } => {
             red = clamp_floor_256_f32(v);
@@ -471,7 +474,7 @@ fn parse_rgb_components_rgb<'i, 't>(arguments: &mut Parser<'i, 't>) -> Result<(u
                     uses_commas = true;
                     arguments.expect_number()?
                 }
-                t => return Err(BasicParseError::UnexpectedToken(t))
+                t => return Err(location.new_basic_unexpected_token_error(t))
             });
             if uses_commas {
                 arguments.expect_comma()?;
@@ -486,14 +489,14 @@ fn parse_rgb_components_rgb<'i, 't>(arguments: &mut Parser<'i, 't>) -> Result<(u
                     uses_commas = true;
                     arguments.expect_percentage()?
                 }
-                t => return Err(BasicParseError::UnexpectedToken(t))
+                t => return Err(location.new_basic_unexpected_token_error(t))
             });
             if uses_commas {
                 arguments.expect_comma()?;
             }
             blue = clamp_unit_f32(arguments.expect_percentage()?);
         }
-        t => return Err(BasicParseError::UnexpectedToken(t))
+        t => return Err(location.new_basic_unexpected_token_error(t))
     };
     return Ok((red, green, blue, uses_commas));
 }
@@ -503,6 +506,7 @@ fn parse_rgb_components_hsl<'i, 't>(arguments: &mut Parser<'i, 't>) -> Result<(u
     let mut uses_commas = false;
     // Hue given as an angle
     // https://drafts.csswg.org/css-values/#angles
+    let location = arguments.current_source_location();
     let hue_degrees = match *arguments.next()? {
         Token::Number { value: v, .. } => v,
         Token::Dimension { value: v, ref unit, .. } => {
@@ -511,24 +515,25 @@ fn parse_rgb_components_hsl<'i, 't>(arguments: &mut Parser<'i, 't>) -> Result<(u
                 "grad" => v * 360. / 400.,
                 "rad" => v * 360. / (2. * PI),
                 "turn" => v * 360.,
-                _ => return Err(BasicParseError::UnexpectedToken(Token::Ident(unit.clone()))),
+                _ => return Err(location.new_basic_unexpected_token_error(Token::Ident(unit.clone()))),
             }
         }
-        ref t => return Err(BasicParseError::UnexpectedToken(t.clone()))
+        ref t => return Err(location.new_basic_unexpected_token_error(t.clone()))
     };
     // Subtract an integer before rounding, to avoid some rounding errors:
     let hue_normalized_degrees = hue_degrees - 360. * (hue_degrees / 360.).floor();
     let hue = hue_normalized_degrees / 360.;
 
     // Saturation and lightness are clamped to 0% ... 100%
     // https://drafts.csswg.org/css-color/#the-hsl-notation
+    let location = arguments.current_source_location();
     let saturation = match arguments.next()?.clone() {
         Token::Percentage { unit_value, .. } => unit_value,
         Token::Comma => {
             uses_commas = true;
             arguments.expect_percentage()?
         }
-        t => return Err(BasicParseError::UnexpectedToken(t))
+        t => return Err(location.new_basic_unexpected_token_error(t))
     };
     let saturation = saturation.max(0.).min(1.);
 

src/lib.rs

@@ -86,13 +86,14 @@ pub use cssparser_macros::*;
 pub use tokenizer::{Token, SourcePosition, SourceLocation};
 pub use rules_and_declarations::{parse_important};
 pub use rules_and_declarations::{DeclarationParser, DeclarationListParser, parse_one_declaration};
-pub use rules_and_declarations::{RuleListParser, parse_one_rule, PreciseParseError};
+pub use rules_and_declarations::{RuleListParser, parse_one_rule};
 pub use rules_and_declarations::{AtRuleType, QualifiedRuleParser, AtRuleParser};
 pub use from_bytes::{stylesheet_encoding, EncodingSupport};
 pub use color::{RGBA, Color, parse_color_keyword};
 pub use nth::parse_nth;
 pub use serializer::{ToCss, CssStringWriter, serialize_identifier, serialize_string, TokenSerializationType};
-pub use parser::{Parser, Delimiter, Delimiters, ParserState, ParseError, BasicParseError, ParserInput};
+pub use parser::{Parser, Delimiter, Delimiters, ParserState, ParserInput};
+pub use parser::{ParseError, ParseErrorKind, BasicParseError, BasicParseErrorKind};
 pub use unicode_range::UnicodeRange;
 pub use cow_rc_str::CowRcStr;
 

src/nth.rs

@@ -24,7 +24,7 @@ pub fn parse_nth<'i, 't>(input: &mut Parser<'i, 't>) -> Result<(i32, i32), Basic
                 "n-" => Ok(try!(parse_signless_b(input, a, -1))),
                 _ => match parse_n_dash_digits(&*unit) {
                     Ok(b) => Ok((a, b)),
-                    Err(()) => Err(BasicParseError::UnexpectedToken(Token::Ident(unit.clone())))
+                    Err(()) => Err(input.new_basic_unexpected_token_error(Token::Ident(unit.clone())))
                 }
             }
         }
@@ -44,7 +44,7 @@ pub fn parse_nth<'i, 't>(input: &mut Parser<'i, 't>) -> Result<(i32, i32), Basic
                     };
                     match parse_n_dash_digits(slice) {
                         Ok(b) => Ok((a, b)),
-                        Err(()) => Err(BasicParseError::UnexpectedToken(Token::Ident(value.clone())))
+                        Err(()) => Err(input.new_basic_unexpected_token_error(Token::Ident(value.clone())))
                     }
                 }
             }
@@ -57,13 +57,13 @@ pub fn parse_nth<'i, 't>(input: &mut Parser<'i, 't>) -> Result<(i32, i32), Basic
                     "n-" => parse_signless_b(input, 1, -1),
                     _ => match parse_n_dash_digits(&*value) {
                         Ok(b) => Ok((1, b)),
-                        Err(()) => Err(BasicParseError::UnexpectedToken(Token::Ident(value.clone())))
+                        Err(()) => Err(input.new_basic_unexpected_token_error(Token::Ident(value.clone())))
                     }
                 }
             }
-            token => Err(BasicParseError::UnexpectedToken(token)),
+            token => Err(input.new_basic_unexpected_token_error(token)),
         },
-        token => Err(BasicParseError::UnexpectedToken(token)),
+        token => Err(input.new_basic_unexpected_token_error(token)),
     }
 }
 
@@ -82,9 +82,10 @@ fn parse_b<'i, 't>(input: &mut Parser<'i, 't>, a: i32) -> Result<(i32, i32), Bas
 }
 
 fn parse_signless_b<'i, 't>(input: &mut Parser<'i, 't>, a: i32, b_sign: i32) -> Result<(i32, i32), BasicParseError<'i>> {
-    match *input.next()? {
+    // FIXME: remove .clone() when lifetimes are non-lexical.
+    match input.next()?.clone() {
         Token::Number { has_sign: false, int_value: Some(b), .. } => Ok((a, b_sign * b)),
-        ref token => Err(BasicParseError::UnexpectedToken(token.clone()))
+        token => Err(input.new_basic_unexpected_token_error(token))
     }
 }