From: handa <handa>
Date: Fri, 13 Nov 2009 13:12:00 +0000 (+0000)
Subject: (match_ids_backward): New function.
X-Git-Tag: REL-0-9-11~42
X-Git-Url: http://git.chise.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1e0fa2bf25fc79591bf064ba67744da2398eac0e;p=m17n%2Flibotf.git

(match_ids_backward): New function.
(match_chain_ids): Call match_ids_backward for backward matching.
---

diff --git a/src/otfdrive.c b/src/otfdrive.c
index 4ae95b8..30081a0 100644
--- a/src/otfdrive.c
+++ b/src/otfdrive.c
@@ -286,6 +286,21 @@ match_ids (OTF_GlyphString *gstring, int gidx, int flag,
 }
 
 static int
+match_ids_backward (OTF_GlyphString *gstring, int gidx, int flag,
+		    int count, OTF_GlyphID *ids)
+{
+  OTF_Glyph *gbeg = gstring->glyphs + gidx;
+  OTF_Glyph *gend = gstring->glyphs;
+  OTF_Glyph *g;
+  int i;
+
+  for (g = gbeg, i = 0; g >= gend && i < count; g--)
+    if (! IGNORED_GLYPH (g, flag) && g->glyph_id != ids[i++])
+      return -1;
+  return (i < count ? -1 : gbeg - g);
+}
+
+static int
 match_chain_ids (OTF_GlyphString *gstring, int gidx, int flag,
 		 OTF_ChainRule *rule)
 {
@@ -301,7 +316,7 @@ match_chain_ids (OTF_GlyphString *gstring, int gidx, int flag,
 	  break;
       if (i > 0)
 	return -1;
-      if (match_ids (gstring, j, flag,
+      if (match_ids_backward (gstring, j, flag,
 		     rule->BacktrackGlyphCount, rule->Backtrack)
 	  < 0)
 	return -1;