Use cssparser's new_with_line_number_offset

cssparser provides a way to set the initial line number on a
ParserInput.  This patch changes servo to use this facility, rather than
reimplement the same functionality itself.

components/style/Cargo.toml

@@ -37,7 +37,7 @@ bitflags = "0.7"
 bit-vec = "0.4.3"
 byteorder = "1.0"
 cfg-if = "0.1.0"
-cssparser = "0.19.3"
+cssparser = "0.19.5"
 encoding = {version = "0.2", optional = true}
 euclid = "0.15"
 fnv = "1.0"

components/style/encoding_support.rs

@@ -72,7 +72,7 @@ impl Stylesheet {
                              stylesheet_loader,
                              error_reporter,
                              quirks_mode,
-                             0u64)
+                             0)
     }
 
     /// Updates an empty stylesheet with a set of bytes that reached over the

components/style/parser.rs

@@ -53,8 +53,6 @@ pub struct ParserContext<'a> {
     pub url_data: &'a UrlExtraData,
     /// The current rule type, if any.
     pub rule_type: Option<CssRuleType>,
-    /// Line number offsets for inline stylesheets
-    pub line_number_offset: u64,
     /// The mode to use when parsing.
     pub parsing_mode: ParsingMode,
     /// The quirks mode of this stylesheet.
@@ -76,7 +74,6 @@ impl<'a> ParserContext<'a> {
             stylesheet_origin: stylesheet_origin,
             url_data: url_data,
             rule_type: rule_type,
-            line_number_offset: 0u64,
             parsing_mode: parsing_mode,
             quirks_mode: quirks_mode,
             namespaces: None,
@@ -109,32 +106,12 @@ impl<'a> ParserContext<'a> {
             stylesheet_origin: context.stylesheet_origin,
             url_data: context.url_data,
             rule_type: Some(rule_type),
-            line_number_offset: context.line_number_offset,
             parsing_mode: context.parsing_mode,
             quirks_mode: context.quirks_mode,
             namespaces: Some(namespaces),
         }
     }
 
-    /// Create a parser context for inline CSS which accepts additional line offset argument.
-    pub fn new_with_line_number_offset(
-        stylesheet_origin: Origin,
-        url_data: &'a UrlExtraData,
-        line_number_offset: u64,
-        parsing_mode: ParsingMode,
-        quirks_mode: QuirksMode,
-    ) -> ParserContext<'a> {
-        ParserContext {
-            stylesheet_origin: stylesheet_origin,
-            url_data: url_data,
-            rule_type: None,
-            line_number_offset: line_number_offset,
-            parsing_mode: parsing_mode,
-            quirks_mode: quirks_mode,
-            namespaces: None,
-        }
-    }
-
     /// Get the rule type, which assumes that one is available.
     pub fn rule_type(&self) -> CssRuleType {
         self.rule_type.expect("Rule type expected, but none was found.")
@@ -148,7 +125,7 @@ impl<'a> ParserContext<'a> {
         where R: ParseErrorReporter
     {
         let location = SourceLocation {
-            line: location.line + self.line_number_offset as u32,
+            line: location.line,
             column: location.column,
         };
         context.error_reporter.report_error(self.url_data, location, error)

components/style/stylesheets/rule_parser.rs

@@ -160,10 +160,7 @@ impl<'a, 'i, R: ParseErrorReporter> AtRuleParser<'i> for TopLevelRuleParser<'a,
         name: CowRcStr<'i>,
         input: &mut Parser<'i, 't>
     ) -> Result<AtRuleType<AtRulePrelude, CssRule>, ParseError<'i>> {
-        let location = get_location_with_offset(
-            input.current_source_location(),
-            self.context.line_number_offset,
-        );
+        let location = get_location_with_offset(input.current_source_location());
         match_ignore_ascii_case! { &*name,
             "import" => {
                 if self.state > State::Imports {
@@ -334,11 +331,7 @@ impl<'a, 'b, 'i, R: ParseErrorReporter> AtRuleParser<'i> for NestedRuleParser<'a
         name: CowRcStr<'i>,
         input: &mut Parser<'i, 't>
     ) -> Result<AtRuleType<AtRulePrelude, CssRule>, ParseError<'i>> {
-        let location =
-            get_location_with_offset(
-                input.current_source_location(),
-                self.context.line_number_offset
-            );
+        let location = get_location_with_offset(input.current_source_location());
 
         match_ignore_ascii_case! { &*name,
             "media" => {
@@ -545,8 +538,7 @@ impl<'a, 'b, 'i, R: ParseErrorReporter> QualifiedRuleParser<'i> for NestedRulePa
             url_data: Some(self.context.url_data),
         };
 
-        let location = get_location_with_offset(input.current_source_location(),
-                                                self.context.line_number_offset);
+        let location = get_location_with_offset(input.current_source_location());
         let selectors = SelectorList::parse(&selector_parser, input)?;
 
         Ok(QualifiedRuleParserPrelude {
@@ -575,13 +567,10 @@ impl<'a, 'b, 'i, R: ParseErrorReporter> QualifiedRuleParser<'i> for NestedRulePa
     }
 }
 
-/// Calculates the location of a rule's source given an offset.
-fn get_location_with_offset(
-    location: SourceLocation,
-    offset: u64
-) -> SourceLocation {
+/// Adjust a location's column to accommodate DevTools.
+fn get_location_with_offset(location: SourceLocation) -> SourceLocation {
     SourceLocation {
-        line: location.line + offset as u32,
+        line: location.line,
         // Column offsets are not yet supported, but Gecko devtools expect 1-based columns.
         column: location.column + 1,
     }

components/style/stylesheets/stylesheet.rs

@@ -73,7 +73,7 @@ impl StylesheetContents {
         stylesheet_loader: Option<&StylesheetLoader>,
         error_reporter: &R,
         quirks_mode: QuirksMode,
-        line_number_offset: u64
+        line_number_offset: u32
     ) -> Self {
         let namespaces = RwLock::new(Namespaces::default());
         let (rules, source_map_url) = Stylesheet::parse_rules(
@@ -311,7 +311,7 @@ impl Stylesheet {
                               url_data: UrlExtraData,
                               stylesheet_loader: Option<&StylesheetLoader>,
                               error_reporter: &R,
-                              line_number_offset: u64)
+                              line_number_offset: u32)
         where R: ParseErrorReporter
     {
         let namespaces = RwLock::new(Namespaces::default());
@@ -349,17 +349,17 @@ impl Stylesheet {
         stylesheet_loader: Option<&StylesheetLoader>,
         error_reporter: &R,
         quirks_mode: QuirksMode,
-        line_number_offset: u64
+        line_number_offset: u32
     ) -> (Vec<CssRule>, Option<String>) {
         let mut rules = Vec::new();
-        let mut input = ParserInput::new(css);
+        let mut input = ParserInput::new_with_line_number_offset(css, line_number_offset);
         let mut input = Parser::new(&mut input);
 
         let context =
-            ParserContext::new_with_line_number_offset(
+            ParserContext::new(
                 origin,
                 url_data,
-                line_number_offset,
+                None,
                 PARSING_MODE_DEFAULT,
                 quirks_mode
             );
@@ -410,7 +410,7 @@ impl Stylesheet {
         stylesheet_loader: Option<&StylesheetLoader>,
         error_reporter: &R,
         quirks_mode: QuirksMode,
-        line_number_offset: u64)
+        line_number_offset: u32)
         -> Stylesheet
     {
         let contents = StylesheetContents::from_str(