Merge pull request #3458 from pcwalton/whitespace-nowrap

layout: Implement `white-space: nowrap`.

components/layout/inline.rs

@@ -253,6 +253,16 @@ pub fn each_char_index(range: &Range<LineIndices>) -> EachIndex<int, CharIndex>
     range::each_index(range.begin().char_index, range.end().char_index)
 }
 
+/// The line wrapping mode, controlled by the `white-space` property as described in CSS 2.1 §
+/// 16.6.
+#[deriving(PartialEq, Eq)]
+enum WrapMode {
+    /// `normal`.
+    WrapNormally,
+    /// `nowrap`.
+    NoWrap,
+}
+
 struct LineBreaker {
     pub floats: Floats,
     pub new_fragments: Vec<Fragment>,
@@ -323,8 +333,13 @@ impl LineBreaker {
                 };
 
                 let fragment_was_appended = match cur_fragment.white_space() {
-                    white_space::normal => self.try_append_to_line(cur_fragment, flow, layout_context),
+                    white_space::normal => {
+                        self.try_append_to_line(cur_fragment, flow, layout_context, WrapNormally)
+                    }
                     white_space::pre => self.try_append_to_line_by_new_line(cur_fragment),
+                    white_space::nowrap => {
+                        self.try_append_to_line(cur_fragment, flow, layout_context, NoWrap)
+                    }
                 };
 
                 if !fragment_was_appended {
@@ -506,9 +521,16 @@ impl LineBreaker {
         }
     }
 
-    /// Tries to append the given fragment to the line, splitting it if necessary. Returns false only if
+    /// Tries to append the given fragment to the line, splitting it if necessary. Returns false if
-    /// we should break the line.
+    /// and only if we should break the line.
-    fn try_append_to_line(&mut self, in_fragment: Fragment, flow: &InlineFlow, layout_context: &LayoutContext) -> bool {
+    ///
+    /// `wrap_mode` controls whether wrapping happens.
+    fn try_append_to_line(&mut self,
+                          in_fragment: Fragment,
+                          flow: &InlineFlow,
+                          layout_context: &LayoutContext,
+                          wrap_mode: WrapMode)
+                          -> bool {
         let line_is_empty = self.pending_line.range.length() == num::zero();
         if line_is_empty {
             let (line_bounds, _) = self.initial_line_placement(&in_fragment, self.cur_b, flow);
@@ -546,16 +568,14 @@ impl LineBreaker {
             return true
         }
 
-        if !in_fragment.can_split() {
+        if (!in_fragment.can_split() && line_is_empty) || wrap_mode == NoWrap {
             // TODO(eatkinson, issue #224): Signal that horizontal overflow happened?
-            if line_is_empty {
             debug!("LineBreaker: case=fragment can't split and line {:u} is empty, so \
                     overflowing.",
                     self.lines.len());
             self.push_fragment_to_line(in_fragment);
             return true
         }
-        }
 
         let available_inline_size = green_zone.inline - self.pending_line.bounds.size.inline;
         let split = in_fragment.find_split_info_for_inline_size(CharIndex(0), available_inline_size, line_is_empty);

components/layout/text.rs

@@ -124,7 +124,7 @@ impl TextRunScanner {
                 let font_style = old_fragment.font_style();
 
                 let compression = match old_fragment.white_space() {
-                    white_space::normal => CompressWhitespaceNewline,
+                    white_space::normal | white_space::nowrap => CompressWhitespaceNewline,
                     white_space::pre => CompressNone,
                 };
 
@@ -168,7 +168,7 @@ impl TextRunScanner {
                 let fontgroup = font_context.get_layout_font_group_for_style(&font_style);
 
                 let compression = match in_fragment.white_space() {
-                    white_space::normal => CompressWhitespaceNewline,
+                    white_space::normal | white_space::nowrap => CompressWhitespaceNewline,
                     white_space::pre => CompressNone,
                 };
 

components/style/properties/mod.rs.mako

@@ -1067,7 +1067,7 @@ pub mod longhands {
         }
     </%self:longhand>
 
-    ${single_keyword("white-space", "normal pre")}
+    ${single_keyword("white-space", "normal pre nowrap")}
 
     // CSS 2.1, Section 17 - Tables
     ${new_style_struct("Table", is_inherited=False)}

tests/ref/basic.list

@@ -141,3 +141,4 @@ flaky_gpu,flaky_linux == acid2_noscroll.html acid2_ref_broken.html
 == float_clearance_a.html float_clearance_ref.html
 == block_formatting_context_a.html block_formatting_context_ref.html
 == inline_block_parent_padding_a.html inline_block_parent_padding_ref.html
+== whitespace_nowrap_a.html whitespace_nowrap_ref.html

tests/ref/whitespace_nowrap_a.html

@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<head>
+</head>
+<body>
+<div style="white-space: nowrap;">
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+</div>
+</body>
+</html>
+
+

tests/ref/whitespace_nowrap_ref.html

@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<head>
+</head>
+<body>
+<div style="width: 9999999px;">
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+    I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA I DON'T WANNA
+</div>
+</body>
+</html>
+
+