third_party/sqlite/patches/0013-fts2-Interpret-foo-as-a-prefix-search.patch

From b3310ec4e29ca2ef45e36a7b188503cd2637c8ba Mon Sep 17 00:00:00 2001
From: Matt Perry <mpcomplete@google.com>
Date: Wed, 17 Dec 2008 00:50:50 +0000
Subject: [PATCH 13/16] [fts2] Interpret "foo*" as a prefix search.

By default it interpreted it as "foo *" (two tokens).

Original review URL: http://codereview.chromium.org/14176
---
 third_party/sqlite/src/ext/fts2/fts2.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/third_party/sqlite/src/ext/fts2/fts2.c b/third_party/sqlite/src/ext/fts2/fts2.c
index 944f324..1c68af5 100644
--- a/third_party/sqlite/src/ext/fts2/fts2.c
+++ b/third_party/sqlite/src/ext/fts2/fts2.c
@@ -3558,6 +3558,7 @@ static int tokenizeSegment(
   int firstIndex = pQuery->nTerms;
   int iCol;
   int nTerm = 1;
+  int iEndLast = -1;
   
   int rc = pModule->xOpen(pTokenizer, pSegment, nSegment, &pCursor);
   if( rc!=SQLITE_OK ) return rc;
@@ -3582,6 +3583,20 @@ static int tokenizeSegment(
       pQuery->nextIsOr = 1;
       continue;
     }
+
+    /*
+     * The ICU tokenizer considers '*' a break character, so the code below
+     * sets isPrefix correctly, but since that code doesn't eat the '*', the
+     * ICU tokenizer returns it as the next token.  So eat it here until a
+     * better solution presents itself.
+     */
+    if( pQuery->nTerms>0 && nToken==1 && pSegment[iBegin]=='*' &&
+        iEndLast==iBegin){
+      pQuery->pTerms[pQuery->nTerms-1].isPrefix = 1;
+      continue;
+    }
+    iEndLast = iEnd;
+
     queryAdd(pQuery, pToken, nToken);
     if( !inPhrase && iBegin>0 && pSegment[iBegin-1]=='-' ){
       pQuery->pTerms[pQuery->nTerms-1].isNot = 1;
-- 
2.2.1