ref: 2eb4fd22728afe62063a7b3ec77adf9c57ac6d09
dir: /jsregexp.c/
#include "jsi.h" #include "jsvalue.h" #include "jsbuiltin.h" #include "regexp.h" void js_newregexp(js_State *J, const char *pattern, int flags) { 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 = js_strdup(J, pattern); obj->u.r.flags = flags; obj->u.r.last = 0; js_pushobject(J, obj); } void js_RegExp_prototype_exec(js_State *J, js_Regexp *re, const char *text) { int result; int i; int opts; Resub m; opts = 0; if (re->flags & JS_REGEXP_G) { if (re->last > strlen(text)) { re->last = 0; js_pushnull(J); 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) { 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 = 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; 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; } 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_newregexp(J, pattern, flags); } 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 *out; re = js_toregexp(J, 0); 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"); if (js_try(J)) { js_free(J, out); js_throw(J); } 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); }