Implement this function, to get logical attributes without a

2000-07-06  Havoc Pennington  <hp@redhat.com>

* pango/break.c (pango_get_log_attrs): Implement this function, to
get logical attributes without a PangoAnalysis.
(pango_break): Fix bug in word stop location

2 files changed, 105 insertions, 1 deletions

diff --git a/pango/break.c b/pango/break.c
index 93ffecf2..0f9d3dfe 100644
--- a/pango/break.c
+++ b/pango/break.c
@@ -20,6 +20,7 @@
  */
 
 #include "pango.h"
+#include "pango-modules.h"
 
 /**
  * pango_break:
@@ -51,9 +52,106 @@ void pango_break (const gchar   *text,
       attrs[i].is_white = (wc == ' ' || wc == '\t' || wc == '\n' || wc == 0x200b) ? 1 : 0;
       attrs[i].is_break = i == 0 || attrs[i-1].is_white || attrs[i].is_white;
       attrs[i].is_char_stop = 1;
-      attrs[i].is_word_stop = (i == 0) || attrs[i-1].is_white;
+      attrs[i].is_word_stop = ((i == 0) || attrs[i-1].is_white) && !attrs[i].is_white;
       
       i++;
       cur = g_utf8_next_char (cur);
     }
 }
+
+/**
+ * pango_get_log_attrs:
+ * @text: text to process
+ * @length: length in bytes of @text
+ * @level: embedding level, or -1 if unknown
+ * @language: language code
+ * @log_attrs: array with one PangoLogAttr per character in @text, to be filled in
+ *
+ * Computes a PangoLogAttr for each character in @text
+ */
+void
+pango_get_log_attrs (const char    *text,
+                     int            length,
+                     int            level,
+                     const char    *language,
+                     PangoLogAttr  *log_attrs)
+{
+  int n_chars;
+  PangoMap *lang_map;
+  int chars_broken;
+  const char *pos;
+  const char *end;
+  PangoEngineLang* range_engine;
+  const char *range_start;
+  int chars_in_range;
+  static guint engine_type_id = 0;
+  static guint render_type_id = 0;  
+  PangoAnalysis analysis = { NULL, NULL, NULL, (guint8)level };
+  
+  g_return_if_fail (length == 0 || text != NULL);
+  g_return_if_fail (log_attrs != NULL);
+  
+  if (length == 0)
+    return;
+  
+  if (engine_type_id == 0)
+    {
+      engine_type_id = g_quark_from_static_string (PANGO_ENGINE_TYPE_LANG);
+      render_type_id = g_quark_from_static_string (PANGO_RENDER_TYPE_NONE);
+    }
+
+  n_chars = g_utf8_strlen (text, length);
+
+  lang_map = pango_find_map (language, engine_type_id, render_type_id);
+    
+  range_start = text;
+  range_engine = (PangoEngineLang*) pango_map_get_engine (lang_map,
+                                                          g_utf8_get_char (text));
+  analysis.lang_engine = range_engine;
+  chars_broken = 0;
+  chars_in_range = 1;
+  
+  end = text + length;
+  pos = g_utf8_next_char (text);
+  
+  while (pos != end)
+    {
+      analysis.lang_engine =
+        (PangoEngineLang*) pango_map_get_engine (lang_map,
+                                                 g_utf8_get_char (pos));
+      
+      if (range_engine != analysis.lang_engine)
+        {
+          /* Engine has changed; do the breaking for the current range,
+           * then start a new range.
+           */
+          pango_break (range_start,
+                       pos - range_start,
+                       &analysis,
+                       log_attrs + chars_broken);
+
+          chars_broken += chars_in_range;
+          
+          range_start = pos;
+          range_engine = analysis.lang_engine;
+          chars_in_range = 1;
+        }
+      else
+        {
+          chars_in_range += 1;
+        }
+      
+      pos = g_utf8_next_char (pos);
+    }
+    
+    g_assert (chars_in_range > 0);
+    g_assert (range_start != end);
+    g_assert (pos == end);
+    g_assert (range_engine == analysis.lang_engine);
+    
+    pango_break (range_start,
+                 end - range_start,
+                 &analysis,
+                 log_attrs + chars_broken);
+}
+
diff --git a/pango/pango.h b/pango/pango.h
index 5d083b9f..e0652fd0 100644
--- a/pango/pango.h
+++ b/pango/pango.h
@@ -57,6 +57,12 @@ void pango_break (const gchar   *text,
 		  PangoAnalysis *analysis, 
 		  PangoLogAttr  *attrs);
 
+void pango_get_log_attrs (const char    *text,
+                          int            length,
+                          int            level,
+                          const char    *language,
+                          PangoLogAttr  *log_attrs);
+
 /* Turn a string of characters into a string of glyphs
  */
 void pango_shape (const gchar      *text,