1 files changed, 130 insertions, 0 deletions
diff --git a/contrib/test_parser/test_parser.c b/contrib/test_parser/test_parser.c
new file mode 100644
index 00000000000..728bf4098fe
--- /dev/null
+++ b/contrib/test_parser/test_parser.c
@@ -0,0 +1,130 @@
+/*-------------------------------------------------------------------------
+ *
+ * test_parser.c
+ *	  Simple example of a text search parser
+ *
+ * Copyright (c) 2007, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *	  $PostgreSQL: pgsql/contrib/test_parser/test_parser.c,v 1.1 2007/10/15 21:36:50 tgl Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "fmgr.h"
+
+PG_MODULE_MAGIC;
+
+
+/*
+ * types
+ */
+
+/* self-defined type */
+typedef struct {
+	char *	buffer; /* text to parse */
+	int		len;	/* length of the text in buffer */
+	int		pos;	/* position of the parser */
+} ParserState;
+
+/* copy-paste from wparser.h of tsearch2 */
+typedef struct {
+	int		lexid;
+	char	*alias;
+	char	*descr;
+} LexDescr;
+
+/*
+ * prototypes
+ */
+PG_FUNCTION_INFO_V1(testprs_start);
+Datum testprs_start(PG_FUNCTION_ARGS);
+
+PG_FUNCTION_INFO_V1(testprs_getlexeme);
+Datum testprs_getlexeme(PG_FUNCTION_ARGS);
+
+PG_FUNCTION_INFO_V1(testprs_end);
+Datum testprs_end(PG_FUNCTION_ARGS);
+
+PG_FUNCTION_INFO_V1(testprs_lextype);
+Datum testprs_lextype(PG_FUNCTION_ARGS);
+
+/*
+ * functions
+ */
+Datum testprs_start(PG_FUNCTION_ARGS)
+{
+	ParserState *pst = (ParserState *) palloc0(sizeof(ParserState));
+	pst->buffer = (char *) PG_GETARG_POINTER(0);
+	pst->len = PG_GETARG_INT32(1);
+	pst->pos = 0;
+
+	PG_RETURN_POINTER(pst);
+}
+
+Datum testprs_getlexeme(PG_FUNCTION_ARGS)
+{
+	ParserState *pst   = (ParserState *) PG_GETARG_POINTER(0);
+	char		**t	   = (char **) PG_GETARG_POINTER(1);
+	int			*tlen  = (int *) PG_GETARG_POINTER(2);
+	int			type;
+
+	*tlen = pst->pos;
+	*t = pst->buffer +	pst->pos;
+
+	if ((pst->buffer)[pst->pos] == ' ')
+	{
+		/* blank type */
+		type = 12;
+		/* go to the next non-white-space character */
+		while ((pst->buffer)[pst->pos] == ' ' &&
+			   pst->pos < pst->len)
+			(pst->pos)++;
+	} else {
+		/* word type */
+		type = 3;
+		/* go to the next white-space character */
+		while ((pst->buffer)[pst->pos] != ' ' &&
+			   pst->pos < pst->len)
+			(pst->pos)++;
+	}
+
+	*tlen = pst->pos - *tlen;
+
+	/* we are finished if (*tlen == 0) */
+	if (*tlen == 0)
+		type=0;
+
+	PG_RETURN_INT32(type);
+}
+
+Datum testprs_end(PG_FUNCTION_ARGS)
+{
+	ParserState *pst = (ParserState *) PG_GETARG_POINTER(0);
+	pfree(pst);
+	PG_RETURN_VOID();
+}
+
+Datum testprs_lextype(PG_FUNCTION_ARGS)
+{
+	/*
+	 * Remarks:
+	 * - we have to return the blanks for headline reason
+	 * - we use the same lexids like Teodor in the default
+	 * word parser; in this way we can reuse the headline
+	 * function of the default word parser.
+	 */
+	LexDescr *descr = (LexDescr *) palloc(sizeof(LexDescr) * (2+1));
+
+	/* there are only two types in this parser */
+	descr[0].lexid = 3;
+	descr[0].alias = pstrdup("word");
+	descr[0].descr = pstrdup("Word");
+	descr[1].lexid = 12;
+	descr[1].alias = pstrdup("blank");
+	descr[1].descr = pstrdup("Space symbols");
+	descr[2].lexid = 0;
+
+	PG_RETURN_POINTER(descr);
+}