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Add a comment to fts3_snippet.c.

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FossilOrigin-Name: b5f5ba3103e6fcf117fb69d5379fa70f691a652d
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dan
2012-10-17 20:28:52 +00:00
parent 6c42aa4a0e
commit 1276cd0ba8
3 changed files with 18 additions and 7 deletions
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11
ext/fts3/fts3_snippet.c
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@ -644,6 +644,17 @@ static int fts3SnippetText(
int iFin = 0; /* Offset in zDoc of end of token */
int isHighlight = 0; /* True for highlighted terms */
/* Variable DUMMY1 is initialized to a negative value above. Elsewhere
** in the FTS code the variable that the third argument to xNext points to
** is initialized to zero before the first (*but not necessarily
** subsequent*) call to xNext(). This is done for a particular application
** that needs to know whether or not the tokenizer is being used for
** snippet generation or for some other purpose.
**
** Extreme care is required when writing code to depend on this
** initialization. It is not a documented part of the tokenizer interface.
** If a tokenizer is used directly by any code outside of FTS, this
** convention might not be respected. */
rc = pMod->xNext(pC, &ZDUMMY, &DUMMY1, &iBegin, &iFin, &iCurrent);
if( rc!=SQLITE_OK ){
if( rc==SQLITE_DONE ){