Fix string-set logic

weasyprint/formatting_structure/build.py

@@ -209,7 +209,7 @@ def before_after_to_box(element, pseudo_type, state, style_for,
 
 
 def content_to_boxes(style, parent_box, quote_depth, counter_values,
-                     get_image_from_uri, context=None):
+                     get_image_from_uri, context=None, page=None):
     """Takes the value of a ``content`` property and yield boxes."""
     texts = []
     for type_, value in style.content:
@@ -233,8 +233,8 @@ def content_to_boxes(style, parent_box, quote_depth, counter_values,
                 counters.format(counter_value, counter_style)
                 for counter_value in counter_values.get(counter_name, [0])
             ))
-        elif type_ == 'string' and context is not None:
-            text = context.get_string_set_for(*value)
+        elif type_ == 'string' and context is not None and page is not None:
+            text = context.get_string_set_for(page, *value)
             texts.append(text)
         else:
             assert type_ == 'QUOTE'

weasyprint/layout/__init__.py

@@ -25,6 +25,7 @@
 from .pages import make_all_pages, make_margin_boxes
 from .backgrounds import layout_backgrounds
 from ..compat import xrange
+from ..formatting_structure import boxes
 
 
 def layout_fixed_boxes(context, pages):
@@ -100,7 +101,7 @@ def finish_block_formatting_context(self, root_box):
         else:
             self.excluded_shapes = None
 
-    def get_string_set_for(self, name, keyword=None):
+    def get_string_set_for(self, page, name, keyword='first'):
         """Resolve value of string function (as set by string set).
 
         We'll have something like this that represents all assignments on a
@@ -119,19 +120,28 @@ def get_string_set_for(self, name, keyword=None):
         :returns: text
 
         """
-        last = keyword == "last"
         if self.current_page in self.string_set[name]:
-            # a value was assigned on this page
-            if keyword == 'first-except':
-                # 'first-except' excludes the page it was assinged on
-                return ""
-            elif last:
-                # use the most recent assignment
-                return self.string_set[name][self.current_page][-1]
-            return self.string_set[name][self.current_page][0]
-        else:
-            # search backwards through previous pages
-            for previous_page in xrange(self.current_page, 0, -1):
-                if previous_page in self.string_set[name]:
-                    return self.string_set[name][previous_page][-1]
-        return ""
+            # A value was assigned on this page
+            first_string = self.string_set[name][self.current_page][0]
+            last_string = self.string_set[name][self.current_page][-1]
+            if keyword == 'first':
+                return first_string
+            elif keyword == 'start':
+                element = page
+                while element:
+                    if element.style['string_set'] != 'none':
+                        for (string_name, _) in element.style['string_set']:
+                            if string_name == name:
+                                return first_string
+                    if isinstance(element, boxes.ParentBox):
+                        if element.children:
+                            element = element.children[0]
+                            continue
+                    break
+            elif keyword == 'last':
+                return last_string
+        # Search backwards through previous pages
+        for previous_page in xrange(self.current_page - 1, 0, -1):
+            if previous_page in self.string_set[name]:
+                return self.string_set[name][previous_page][-1]
+        return ''

weasyprint/layout/pages.py

@@ -310,7 +310,7 @@ def make_box(at_keyword, containing_block):
             quote_depth = [0]
             box.children = build.content_to_boxes(
                 box.style, box, quote_depth, counter_values,
-                context.get_image_from_uri, context)
+                context.get_image_from_uri, context, page)
             # content_to_boxes() only produces inline-level boxes, no need to
             # run other post-processors from build.build_formatting_structure()
             box = build.inline_in_block(box)