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jsregexp.c
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jsregexp.c
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#include "jsi.h"
#include "regexp.h"
static char *escaperegexp(js_State *J, const char *pattern) {
char *copy, *p;
const char *s;
int n = 0;
for (s = pattern; *s; ++s) {
if (*s == '/')
++n;
++n;
}
copy = p = js_malloc(J, n+1);
for (s = pattern; *s; ++s) {
if (*s == '/')
*p++ = '\\';
*p++ = *s;
}
*p = 0;
return copy;
}
static void js_newregexpx(js_State *J, const char *pattern, int flags, int is_clone)
{
const char *error;
js_Object *obj;
Reprog *prog;
int opts;
obj = jsV_newobject(J, JS_CREGEXP, J->RegExp_prototype);
opts = 0;
if (flags & JS_REGEXP_I) opts |= REG_ICASE;
if (flags & JS_REGEXP_M) opts |= REG_NEWLINE;
prog = js_regcompx(J->alloc, J->actx, pattern, opts, &error);
if (!prog)
js_syntaxerror(J, "regular expression: %s", error);
obj->u.r.prog = prog;
obj->u.r.source = is_clone ? js_strdup(J, pattern) : escaperegexp(J, pattern);
obj->u.r.flags = flags;
obj->u.r.last = 0;
js_pushobject(J, obj);
}
void js_newregexp(js_State *J, const char *pattern, int flags)
{
js_newregexpx(J, pattern, flags, 0);
}
void js_RegExp_prototype_exec(js_State *J, js_Regexp *re, const char *text)
{
const char *haystack;
int result;
int i;
int opts;
Resub m;
haystack = text;
opts = 0;
if (re->flags & JS_REGEXP_G) {
if (re->last > strlen(haystack)) {
re->last = 0;
js_pushnull(J);
return;
}
if (re->last > 0) {
haystack = text + re->last;
opts |= REG_NOTBOL;
}
}
result = js_regexec(re->prog, haystack, &m, opts);
if (result < 0)
js_error(J, "regexec failed");
if (result == 0) {
js_newarray(J);
js_pushstring(J, text);
js_setproperty(J, -2, "input");
js_pushnumber(J, js_utfptrtoidx(text, m.sub[0].sp));
js_setproperty(J, -2, "index");
for (i = 0; i < m.nsub; ++i) {
js_pushlstring(J, m.sub[i].sp, m.sub[i].ep - m.sub[i].sp);
js_setindex(J, -2, i);
}
if (re->flags & JS_REGEXP_G)
re->last = m.sub[0].ep - text;
return;
}
if (re->flags & JS_REGEXP_G)
re->last = 0;
js_pushnull(J);
}
static void Rp_test(js_State *J)
{
js_Regexp *re;
const char *text;
int result;
int opts;
Resub m;
re = js_toregexp(J, 0);
text = js_tostring(J, 1);
opts = 0;
if (re->flags & JS_REGEXP_G) {
if (re->last > strlen(text)) {
re->last = 0;
js_pushboolean(J, 0);
return;
}
if (re->last > 0) {
text += re->last;
opts |= REG_NOTBOL;
}
}
result = js_regexec(re->prog, text, &m, opts);
if (result < 0)
js_error(J, "regexec failed");
if (result == 0) {
if (re->flags & JS_REGEXP_G)
re->last = re->last + (m.sub[0].ep - text);
js_pushboolean(J, 1);
return;
}
if (re->flags & JS_REGEXP_G)
re->last = 0;
js_pushboolean(J, 0);
}
static void jsB_new_RegExp(js_State *J)
{
js_Regexp *old;
const char *pattern;
int flags;
int is_clone = 0;
if (js_isregexp(J, 1)) {
if (js_isdefined(J, 2))
js_typeerror(J, "cannot supply flags when creating one RegExp from another");
old = js_toregexp(J, 1);
pattern = old->source;
flags = old->flags;
is_clone = 1;
} else if (js_isundefined(J, 1)) {
pattern = "(?:)";
flags = 0;
} else {
pattern = js_tostring(J, 1);
flags = 0;
}
if (strlen(pattern) == 0)
pattern = "(?:)";
if (js_isdefined(J, 2)) {
const char *s = js_tostring(J, 2);
int g = 0, i = 0, m = 0;
while (*s) {
if (*s == 'g') ++g;
else if (*s == 'i') ++i;
else if (*s == 'm') ++m;
else js_syntaxerror(J, "invalid regular expression flag: '%c'", *s);
++s;
}
if (g > 1) js_syntaxerror(J, "invalid regular expression flag: 'g'");
if (i > 1) js_syntaxerror(J, "invalid regular expression flag: 'i'");
if (m > 1) js_syntaxerror(J, "invalid regular expression flag: 'm'");
if (g) flags |= JS_REGEXP_G;
if (i) flags |= JS_REGEXP_I;
if (m) flags |= JS_REGEXP_M;
}
js_newregexpx(J, pattern, flags, is_clone);
}
static void jsB_RegExp(js_State *J)
{
if (js_isregexp(J, 1))
return;
jsB_new_RegExp(J);
}
static void Rp_toString(js_State *J)
{
js_Regexp *re;
char * volatile out = NULL;
re = js_toregexp(J, 0);
if (js_try(J)) {
js_free(J, out);
js_throw(J);
}
out = js_malloc(J, strlen(re->source) + 6); /* extra space for //gim */
strcpy(out, "/");
strcat(out, re->source);
strcat(out, "/");
if (re->flags & JS_REGEXP_G) strcat(out, "g");
if (re->flags & JS_REGEXP_I) strcat(out, "i");
if (re->flags & JS_REGEXP_M) strcat(out, "m");
js_pop(J, 0);
js_pushstring(J, out);
js_endtry(J);
js_free(J, out);
}
static void Rp_exec(js_State *J)
{
js_RegExp_prototype_exec(J, js_toregexp(J, 0), js_tostring(J, 1));
}
void jsB_initregexp(js_State *J)
{
js_pushobject(J, J->RegExp_prototype);
{
jsB_propf(J, "RegExp.prototype.toString", Rp_toString, 0);
jsB_propf(J, "RegExp.prototype.test", Rp_test, 0);
jsB_propf(J, "RegExp.prototype.exec", Rp_exec, 0);
}
js_newcconstructor(J, jsB_RegExp, jsB_new_RegExp, "RegExp", 1);
js_defglobal(J, "RegExp", JS_DONTENUM);
}