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exported xmlExpExpDerive(), added it to the testRegexp command line tool

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* testRegexp.c xmlregexp.c include/libxml/xmlregexp.h: exported
  xmlExpExpDerive(), added it to the testRegexp command line
  tool when providing multiple expressions.
Daniel
This commit is contained in:
Daniel Veillard
2005-08-22 14:43:43 +00:00
parent 355a023866
commit 0090bd524f
4 changed files with 162 additions and 16 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
Mon Aug 22 16:42:07 CEST 2005 Daniel Veillard <daniel@veillard.com>
* testRegexp.c xmlregexp.c include/libxml/xmlregexp.h: exported
xmlExpExpDerive(), added it to the testRegexp command line
tool when providing multiple expressions.
Mon Aug 22 14:57:13 CEST 2005 Daniel Veillard <daniel@veillard.com>
* Makefile.am result/expr/base test/expr/base: added the first

4
include/libxml/xmlregexp.h
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@ -178,6 +178,10 @@ XMLPUBFUN xmlExpNodePtr XMLCALL
xmlExpNodePtr expr,
const xmlChar *str,
int len);
XMLPUBFUN xmlExpNodePtr XMLCALL
xmlExpExpDerive (xmlExpCtxtPtr ctxt,
xmlExpNodePtr exp,
xmlExpNodePtr sub);
XMLPUBFUN int XMLCALL
xmlExpSubsume (xmlExpCtxtPtr ctxt,
xmlExpNodePtr expr,

99
testRegexp.c
View File

@ -179,6 +179,79 @@ runFileTest(xmlExpCtxtPtr ctxt, const char *filename) {
}
fclose(input);
}
static void
testReduce(xmlExpCtxtPtr ctxt, xmlExpNodePtr expr, const char *tst) {
xmlBufferPtr xmlExpBuf;
xmlExpNodePtr sub, deriv;
xmlExpBuf = xmlBufferCreate();
sub = xmlExpParse(ctxt, tst);
if (sub == NULL) {
printf("Subset %s failed to parse\n", tst);
return;
}
xmlExpDump(xmlExpBuf, expr);
printf("Subset parsed as: %s\n",
(const char *) xmlBufferContent(xmlExpBuf));
deriv = xmlExpExpDerive(ctxt, expr, sub);
if (deriv == NULL) {
printf("Derivation led to an internal error, report this !\n");
return;
} else {
xmlBufferEmpty(xmlExpBuf);
xmlExpDump(xmlExpBuf, deriv);
if (xmlExpIsNillable(deriv))
printf("Resulting nillable derivation: %s\n",
(const char *) xmlBufferContent(xmlExpBuf));
else
printf("Resulting derivation: %s\n",
(const char *) xmlBufferContent(xmlExpBuf));
xmlExpFree(ctxt, deriv);
}
xmlExpFree(ctxt, sub);
}
static void
exprDebug(xmlExpCtxtPtr ctxt, xmlExpNodePtr expr) {
xmlBufferPtr xmlExpBuf;
xmlExpNodePtr deriv;
const char *list[40];
int ret;
xmlExpBuf = xmlBufferCreate();
if (expr == NULL) {
printf("Failed to parse\n");
return;
}
xmlExpDump(xmlExpBuf, expr);
printf("Parsed as: %s\n", (const char *) xmlBufferContent(xmlExpBuf));
printf("Max token input = %d\n", xmlExpMaxToken(expr));
if (xmlExpIsNillable(expr) == 1)
printf("Is nillable\n");
ret = xmlExpGetLanguage(ctxt, expr, (const xmlChar **) &list[0], 40);
if (ret < 0)
printf("Failed to get list: %d\n", ret);
else {
int i;
printf("Language has %d strings, testing string derivations\n", ret);
for (i = 0;i < ret;i++) {
deriv = xmlExpStringDerive(ctxt, expr, BAD_CAST list[i], -1);
if (deriv == NULL) {
printf(" %s -> derivation failed\n", list[i]);
} else {
xmlBufferEmpty(xmlExpBuf);
xmlExpDump(xmlExpBuf, deriv);
printf(" %s -> %s\n", list[i],
(const char *) xmlBufferContent(xmlExpBuf));
}
xmlExpFree(ctxt, deriv);
}
}
xmlBufferFree(xmlExpBuf);
}
#endif
static void usage(const char *name) {
@ -248,6 +321,31 @@ int main(int argc, char **argv) {
#endif
testRegexpFile(filename);
} else {
#ifdef LIBXML_EXPR_ENABLED
if (use_exp) {
for (i = 1; i < argc ; i++) {
if ((argv[i][0] != '-') || (strcmp(argv[i], "-") == 0)) {
if (pattern == NULL) {
pattern = argv[i];
printf("Testing expr %s:\n", pattern);
expr = xmlExpParse(ctxt, pattern);
if (expr == NULL) {
printf(" failed to compile\n");
break;
}
if (debug) {
exprDebug(ctxt, expr);
}
} else {
testReduce(ctxt, expr, argv[i]);
}
}
}
if (expr != NULL)
xmlExpFree(ctxt, expr);
} else
#endif
{
for (i = 1; i < argc ; i++) {
if ((argv[i][0] != '-') || (strcmp(argv[i], "-") == 0)) {
if (pattern == NULL) {
@ -268,6 +366,7 @@ int main(int argc, char **argv) {
if (comp != NULL)
xmlRegFreeRegexp(comp);
}
}
#ifdef LIBXML_EXPR_ENABLED
if (ctxt != NULL) {
printf("Ops: %d nodes, %d cons\n",

37
xmlregexp.c
View File

@ -6819,6 +6819,43 @@ xmlExpExpDeriveInt(xmlExpCtxtPtr ctxt, xmlExpNodePtr exp, xmlExpNodePtr sub) {
return(ret);
}
/**
* xmlExpExpDerive:
* @ctxt: the expressions context
* @exp: the englobing expression
* @sub: the subexpression
*
* Evaluates the expression resulting from @exp consuming a sub expression @sub
* Based on algebraic derivation and sometimes direct Brzozowski derivation
* it usually tatkes less than linear time and can handle expressions generating
* infinite languages.
*
* Returns the resulting expression or NULL in case of internal error, the
* result must be freed
*/
xmlExpNodePtr
xmlExpExpDerive(xmlExpCtxtPtr ctxt, xmlExpNodePtr exp, xmlExpNodePtr sub) {
if ((exp == NULL) || (ctxt == NULL) || (sub == NULL))
return(NULL);
/*
* O(1) speedups
*/
if (IS_NILLABLE(sub) && (!IS_NILLABLE(exp))) {
#ifdef DEBUG_DERIV
printf("Sub nillable and not exp : can't subsume\n");
#endif
return(forbiddenExp);
}
if (xmlExpCheckCard(exp, sub) == 0) {
#ifdef DEBUG_DERIV
printf("sub generate longuer sequances than exp : can't subsume\n");
#endif
return(forbiddenExp);
}
return(xmlExpExpDeriveInt(ctxt, exp, sub));
}
/**
* xmlExpSubsume:
* @ctxt: the expressions context