Finish conversion to using only character ranges. We don't crash on m…

…ulti-byte characters any more.

src/servo-gfx/text/glyph.rs

@@ -631,12 +631,8 @@ impl GlyphStore {
     }
 
     pure fn char_is_newline(i: uint) -> bool {
-        if i >= self.entry_buffer.len() {
-            error!("char_is_newline: beyond entry buffer!");
-            false
-        } else {
-            self.entry_buffer[i].char_is_newline()
-        }
+        assert i < self.entry_buffer.len();
+        self.entry_buffer[i].char_is_newline()
     }
 
     pure fn is_ligature_start(i: uint) -> bool {

src/servo-gfx/text/text_run.rs

@@ -59,15 +59,16 @@ impl TextRun {
     static fn compute_potential_breaks(text: &str, glyphs: &mut GlyphStore) {
         // TODO(Issue #230): do a better job. See Gecko's LineBreaker.
 
-        let mut i = 0u;
+        let mut byte_i = 0u;
+        let mut char_j = 0u;
         let mut prev_is_whitespace = false;
-        while i < text.len() {
-            let {ch, next} = str::char_range_at(text, i);
+        while byte_i < text.len() {
+            let {ch, next} = str::char_range_at(text, byte_i);
             // set char properties.
             match ch {
-                ' '  => { glyphs.set_char_is_space(i); },
-                '\t' => { glyphs.set_char_is_tab(i); },
-                '\n' => { glyphs.set_char_is_newline(i); },
+                ' '  => { glyphs.set_char_is_space(char_j); },
+                '\t' => { glyphs.set_char_is_tab(char_j); },
+                '\n' => { glyphs.set_char_is_newline(char_j); },
                 _ => {}
             }
 
@@ -76,21 +77,22 @@ impl TextRun {
                 match ch {
                     ' ' | '\t' | '\n' => {},
                     _ => {
-                        glyphs.set_can_break_before(i, BreakTypeNormal);
+                        glyphs.set_can_break_before(char_j, BreakTypeNormal);
                         prev_is_whitespace = false;
                     }
                 }
             } else {
                 match ch {
                     ' ' | '\t' | '\n' => {
-                        glyphs.set_can_break_before(i, BreakTypeNormal);
+                        glyphs.set_can_break_before(char_j, BreakTypeNormal);
                         prev_is_whitespace = true;
                     },
                     _ => { }
                 }
             }
 
-            i = next;
+            byte_i = next;
+            char_j += 1;
         }
     }
 
@@ -102,18 +104,14 @@ impl TextRun {
         }
     }
 
+    pure fn char_len() -> uint { self.glyphs.entry_buffer.len() }
     pure fn glyphs(&self) -> &self/GlyphStore { &self.glyphs }
 
     pure fn range_is_trimmable_whitespace(&self, range: &const Range) -> bool {
-        let mut i = range.begin();
-        while i < range.end() {
-            // jump i to each new char
-            let {ch, next} = str::char_range_at(self.text, i);
-            match ch {
-                ' ' | '\t' | '\r'  => {},
-                _ => { return false; }
-            }
-            i = next;
+        for range.eachi |i| {
+            if  !self.glyphs.char_is_space(i) &&
+                !self.glyphs.char_is_tab(i)   &&
+                !self.glyphs.char_is_newline(i) { return false; }
         }
         return true;
     }
@@ -124,7 +122,9 @@ impl TextRun {
 
     fn min_width_for_range(&self, range: &const Range) -> Au {
         let mut max_piece_width = Au(0);
+        debug!("iterating outer range %?", range);
         for self.iter_indivisible_pieces_for_range(range) |piece_range| {
+            debug!("iterated on %?", piece_range);
             let metrics = self.font.measure_text(self, piece_range);
             max_piece_width = Au::max(max_piece_width, metrics.advance_width);
         }

src/servo/layout/inline.rs

@@ -246,7 +246,7 @@ priv impl TextRunScanner {
                 debug!("TextRunScanner: pushing single text box in range: %?", self.clump);
                 let new_box = layout::text::adapt_textbox_with_range(old_box.d(),
                                                                      run,
-                                                                     &const Range::new(0, run.text.len()));
+                                                                     &const Range::new(0, run.char_len()));
                 out_boxes.push(new_box);
             },
             (false, true) => {
@@ -263,14 +263,15 @@ priv impl TextRunScanner {
                     transform_text(in_boxes[idx].raw_text(), compression)
                 });
 
-                // next, concatenate all of the transformed strings together, saving the new text indices
-
-                // TODO(Issue #118): use a rope, simply give ownership of  nonzero strs to rope
+                // next, concatenate all of the transformed strings together, saving the new char indices
                 let mut run_str : ~str = ~"";
                 let new_ranges : DVec<Range> = DVec();
+                let mut char_total = 0u;
                 for uint::range(0, transformed_strs.len()) |i| {
-                    new_ranges.push(Range::new(run_str.len(), transformed_strs[i].len()));
+                    let added_chars = str::char_len(transformed_strs[i]);
+                    new_ranges.push(Range::new(char_total, added_chars));
                     str::push_str(&mut run_str, transformed_strs[i]);
+                    char_total += added_chars;
                 }
 
                 // create the run, then make new boxes with the run and adjusted text indices

src/servo/layout/text.rs

@@ -19,8 +19,12 @@ pub fn TextBoxData(run: @TextRun, range: &const Range) -> TextBoxData {
 
 pub fn adapt_textbox_with_range(box_data: &RenderBoxData, run: @TextRun, 
                                 range: &const Range) -> @RenderBox {
+    assert range.begin() < run.char_len();
+    assert range.end() <= run.char_len();
+    assert range.length() > 0;
+
     debug!("Creating textbox with span: (strlen=%u, off=%u, len=%u) of textrun: %s",
-           run.text.len(), range.begin(), range.length(), run.text);
+           run.char_len(), range.begin(), range.length(), run.text);
     let new_box_data = copy *box_data;
     let new_text_data = TextBoxData(run, range);
     let metrics = run.metrics_for_range(range);