711 lines
18 KiB
C
711 lines
18 KiB
C
/*
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* regular expression module
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*
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* Important Note: do not support group name index
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*
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* $Id$
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*/
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#include <stdio.h>
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#include <assert.h>
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#include "regexpr.c"
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/* tinypy API to be use in this unit */
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extern tp_obj tp_data(TP,int magic,void *v);
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extern tp_obj tp_object_new(TP);
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extern tp_obj tp_object(TP);
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extern tp_obj tp_method(TP,tp_obj self,tp_obj v(TP));
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extern tp_obj tp_string_copy(TP, const char *s, int n);
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extern tp_obj tp_list(TP);
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extern tp_obj tp_copy(TP);
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/* last error message */
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static const char * LastError = NULL;
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/* lower level regex object */
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typedef struct {
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struct re_pattern_buffer re_patbuf; /* The compiled expression */
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struct re_registers re_regs; /* The registers from the last match */
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char re_fastmap[256]; /* Storage for fastmap */
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unsigned char *re_translate; /* String object for translate table */
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unsigned char *re_lastok; /* String object last matched/searched */
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/* supplementary */
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int re_errno; /* error num */
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int re_syntax; /* syntax */
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} regexobject;
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/* local declarations */
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static regexobject* getre(TP, tp_obj rmobj);
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static tp_obj match_obj_group(TP);
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static tp_obj match_obj_groups(TP);
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static tp_obj match_obj_start(TP);
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static tp_obj match_obj_end(TP);
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static tp_obj match_obj_span(TP);
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/*
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* helper function: return lower level regex object
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* rmobj - regex or match object
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*/
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static regexobject * getre(TP, tp_obj rmobj)
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{
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tp_obj reobj_data = tp_get(tp, rmobj, tp_string("__data__"));
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regexobject *re = NULL;
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/* validate magic */
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if (reobj_data.data.magic != sizeof(regexobject)) {
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LastError = "broken regex object";
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return (NULL);
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}
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re = (regexobject*)reobj_data.data.val;
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assert(re);
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return (re);
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}
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/*
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* derive match object from regex object
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*/
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static tp_obj match_object(TP, tp_obj reobj)
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{
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tp_obj mo = tp_object(tp); /* match object */
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tp_obj redata; /* regex object data */
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tp_obj madata; /* match object data */
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regexobject *re = NULL; /* lower level regex object */
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redata = tp_get(tp, reobj, tp_string("__data__"));
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re = (regexobject *)redata.data.val;
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assert(re);
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madata = tp_data(tp, (int)sizeof(regexobject), re);
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tp_set(tp, mo, tp_string("group"), tp_method(tp, mo, match_obj_group));
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tp_set(tp, mo, tp_string("groups"), tp_method(tp, mo, match_obj_groups));
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tp_set(tp, mo, tp_string("start"), tp_method(tp, mo, match_obj_start));
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tp_set(tp, mo, tp_string("end"), tp_method(tp, mo, match_obj_end));
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tp_set(tp, mo, tp_string("span"), tp_method(tp, mo, match_obj_span));
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tp_set(tp, mo, tp_string("__data__"), madata);
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return (mo);
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}
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/*
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* FUNC: regexobj.search(str[,pos=0])
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* self - regex object
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* str - string to be searched
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* pos - optional starting offset
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*
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* RETURN:
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* match object - when matched
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* None - not matched
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*/
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static tp_obj regex_obj_search(TP)
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{
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tp_obj self = TP_OBJ(); /* regex object */
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tp_obj str = TP_STR();
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tp_obj pos = TP_DEFAULT(tp_number(0));
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tp_obj maobj; /* match object */
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regexobject *re = NULL;
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int r = -2; /* -2 indicate exception */
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int range;
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if (pos.number.val < 0 || pos.number.val > str.string.len) {
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LastError = "search offset out of range";
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goto exception;
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}
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range = str.string.len - pos.number.val;
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re = getre(tp, self);
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re->re_lastok = NULL;
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r = re_search(&re->re_patbuf, (unsigned char *)str.string.val,
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str.string.len, pos.number.val, range, &re->re_regs);
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/* cannot match pattern */
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if (r == -1)
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goto notfind;
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/* error occurred */
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if (r == -2)
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goto exception;
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/* matched */
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re->re_lastok = (unsigned char *)str.string.val;
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/* match obj */
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maobj = match_object(tp, self);
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return (maobj);
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notfind:
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re->re_lastok = NULL;
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return (tp_None);
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exception:
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re->re_lastok = NULL;
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tp_raise(tp_None, tp_string("regex search error"));
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}
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/*
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* FUNC: regexobj.match(str[,pos=0])
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* self - regex object
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* str - string to be matched
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* pos - optional starting position
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*
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* RETURN:
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* match object - when matched
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* None - not matched
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*/
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static tp_obj regex_obj_match(TP)
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{
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tp_obj self = TP_OBJ(); /* regex object */
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tp_obj str = TP_STR();
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tp_obj pos = TP_DEFAULT(tp_number(0));
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tp_obj maobj; /* match object */
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regexobject *re = NULL;
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int r = -2; /* -2 indicate exception */
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re = getre(tp, self);
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re->re_lastok = NULL;
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r = re_match(&re->re_patbuf, (unsigned char *)str.string.val,
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str.string.len, pos.number.val, &re->re_regs);
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/* cannot match pattern */
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if (r == -1)
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goto nomatch;
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/* error occurred */
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if (r == -2)
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goto exception;
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/* matched */
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re->re_lastok = (unsigned char *)str.string.val;
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/* match obj */
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maobj = match_object(tp, self);
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return (maobj);
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nomatch:
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re->re_lastok = NULL;
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return (tp_None);
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exception:
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re->re_lastok = NULL;
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tp_raise(tp_None, tp_string("regex match error"));
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}
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/*
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* regex object split()
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* self - regex object
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* restr - regex string
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* maxsplit - max split field, default 0, mean no limit
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*/
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static tp_obj regex_obj_split(TP)
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{
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tp_obj self = TP_OBJ(); /* regex object */
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tp_obj restr = TP_OBJ(); /* string */
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tp_obj maxsplit = TP_DEFAULT(tp_number(0));
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tp_obj maobj; /* match object */
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regexobject *re = NULL; /* lower level regex object */
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tp_obj result = tp_list(tp);
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tp_obj grpstr; /* group string */
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int slen; /* string length */
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int srchloc; /* search location */
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/* maxsplit == 0 means no limit */
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if ((int)maxsplit.number.val == 0)
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maxsplit.number.val = RE_NREGS;
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assert(maxsplit.number.val > 0);
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srchloc = 0;
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slen = strlen((char *)restr.string.val);
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do {
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/* generate a temp match object */
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tp_params_v(tp, 3, self, restr, tp_number(srchloc));
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maobj = regex_obj_search(tp);
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if (!tp_bool(tp, maobj))
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break;
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re = getre(tp, maobj);
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if (re->re_lastok == NULL) {
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tp_raise(tp_None, tp_string("no match for split()"));
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}
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/* extract fields */
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if ((int)maxsplit.number.val > 0) {
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int start = re->re_regs.start[0];
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int end = re->re_regs.end[0];
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/*printf("%s:start(%d),end(%d)\n", __func__, start, end);*/
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if (start < 0 || end < 0)
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break;
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grpstr = tp_string_copy(tp,
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(const char *)re->re_lastok + srchloc, start - srchloc);
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if (tp_bool(tp, grpstr)) {
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tp_set(tp, result, tp_None, grpstr);
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maxsplit.number.val--;
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}
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srchloc = end;
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}
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} while (srchloc < slen && (int)maxsplit.number.val > 0);
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/* collect remaining string, if necessary */
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if (srchloc < slen) {
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grpstr = tp_string_copy(tp,
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(const char *)restr.string.val + srchloc, slen - srchloc);
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if (tp_bool(tp, grpstr))
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tp_set(tp, result, tp_None, grpstr);
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}
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return (result);
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}
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/*
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* regex object findall()
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* self - regex object
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* restr - regex string
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* pos - starting position, default 0
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*/
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static tp_obj regex_obj_findall(TP)
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{
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tp_obj self = TP_OBJ(); /* regex object */
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tp_obj restr = TP_OBJ(); /* string */
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tp_obj pos = TP_DEFAULT(tp_number(0));
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tp_obj maobj; /* match object */
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regexobject *re = NULL; /* lower level regex object */
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tp_obj result = tp_list(tp);
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tp_obj grpstr; /* group string */
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int slen; /* string length */
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int srchloc; /* search location */
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srchloc = (int)pos.number.val;
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slen = strlen((char *)restr.string.val);
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if (srchloc < 0 || srchloc >= slen)
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tp_raise(tp_None, tp_string("starting position out of range"));
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do {
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/* generate a temp match object */
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tp_params_v(tp, 3, self, restr, tp_number(srchloc));
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maobj = regex_obj_search(tp);
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if (!tp_bool(tp, maobj))
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break;
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re = getre(tp, maobj);
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if (re->re_lastok == NULL) {
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tp_raise(tp_None, tp_string("no match for findall()"));
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}
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/* extract fields */
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if (srchloc < slen) {
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int start = re->re_regs.start[0];
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int end = re->re_regs.end[0];
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/*printf("%s:start(%d),end(%d)\n", __func__, start, end);*/
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if (start < 0 || end < 0)
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break;
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grpstr = tp_string_copy(tp,
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(const char *)re->re_lastok + start, end - start);
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if (tp_bool(tp, grpstr)) {
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tp_set(tp, result, tp_None, grpstr);
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}
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srchloc = end;
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}
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} while (srchloc < slen);
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return (result);
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}
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/*
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* FUNC: matchobj.group([group1, ...])
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* self - match object
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* args - optional group indices, default 0
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*
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* return specified group.
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*/
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static tp_obj match_obj_group(TP)
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{
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tp_obj self = TP_OBJ(); /* match object */
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tp_obj grpidx; /* a group index */
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regexobject *re = NULL;
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int indices[RE_NREGS];
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int start;
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int end;
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int i;
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int single = 0; /* single group index? */
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tp_obj result;
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/* get lower level regex object representation */
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re = getre(tp, self);
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if (re->re_lastok == NULL)
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tp_raise(tp_None,
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tp_string("group() only valid after successful match/search"));
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for (i = 0; i < RE_NREGS; i++)
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indices[i] = -1;
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/*
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* if no group index provided, supply default group index 0; else
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* fill in indices[] with provided group index list.
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*/
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if (tp->params.list.val->len == 0) {
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indices[0] = 0;
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single = 1;
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} else if (tp->params.list.val->len == 1) {
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indices[0] = (int)TP_NUM();
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single = 1;
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} else {
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i = 0;
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TP_LOOP(grpidx)
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if (grpidx.number.val < 0 || grpidx.number.val > RE_NREGS)
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tp_raise(tp_None, tp_string("group() grpidx out of range"));
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indices[i++] = (int)grpidx.number.val;
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TP_END
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}
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/* generate result string list */
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result = tp_list(tp);
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for (i = 0; i < RE_NREGS && indices[i] >= 0; i++) {
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tp_obj grpstr;
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start = re->re_regs.start[indices[i]];
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end = re->re_regs.end[indices[i]];
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if (start < 0 || end < 0) {
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grpstr = tp_None;
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} else {
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grpstr = tp_string_copy(tp, (const char *)re->re_lastok + start,
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end - start);
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}
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tp_set(tp, result, tp_None, grpstr);
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}
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return (single ? tp_get(tp, result, tp_number(0)) : result);
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}
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/*
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* FUNC: matchobj.groups()
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* self - match object.
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* return all groups.
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* Note: CPython allow a 'default' argument, but we disallow it.
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*/
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static tp_obj match_obj_groups(TP)
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{
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tp_obj self = TP_OBJ(); /* match object */
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regexobject *re = NULL;
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int start;
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int end;
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int i;
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tp_obj result = tp_list(tp);
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re = getre(tp, self);
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if (re->re_lastok == NULL) {
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tp_raise(tp_None,
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tp_string("groups() only valid after successful match/search"));
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}
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for (i = 1; i < RE_NREGS; i++) {
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start = re->re_regs.start[i];
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end = re->re_regs.end[i];
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if (start < 0 || end < 0)
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break;
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tp_obj grpstr = tp_string_copy(tp,
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(const char *)re->re_lastok + start, end - start);
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if (tp_bool(tp, grpstr))
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tp_set(tp, result, tp_None, grpstr);
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}
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return (result);
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}
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/*
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* FUNC: matchobj.start([group])
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* self - match object
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* group - group index
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* return starting position of matched 'group' substring.
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*/
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static tp_obj match_obj_start(TP)
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{
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tp_obj self = TP_OBJ(); /* match object */
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tp_obj group = TP_DEFAULT(tp_number(0)); /* group */
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regexobject *re = NULL;
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int start;
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re = getre(tp, self);
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if (re->re_lastok == NULL) {
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tp_raise(tp_None,
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tp_string("start() only valid after successful match/search"));
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}
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if (group.number.val < 0 || group.number.val > RE_NREGS)
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tp_raise(tp_None, tp_string("IndexError: group index out of range"));
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start = re->re_regs.start[(int)group.number.val];
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return (tp_number(start));
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}
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/*
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* FUNC: matchobj.end([group])
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* self - match object
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* group - group index
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* return ending position of matched 'group' substring.
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*/
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static tp_obj match_obj_end(TP)
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{
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tp_obj self = TP_OBJ(); /* match object */
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tp_obj group = TP_DEFAULT(tp_number(0)); /* group */
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regexobject *re = NULL;
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int end;
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re = getre(tp, self);
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if (re->re_lastok == NULL) {
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tp_raise(tp_None,
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tp_string("end() only valid after successful match/search"));
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}
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if (group.number.val < 0 || group.number.val > RE_NREGS)
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tp_raise(tp_None, tp_string("IndexError: group index out of range"));
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end = re->re_regs.end[(int)group.number.val];
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return (tp_number(end));
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}
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/*
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* FUNC: matchobj.span([group])
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* self - match object
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* group - group index
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* return [start,end] position pair of matched 'group' substring.
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*/
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static tp_obj match_obj_span(TP)
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{
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tp_obj self = TP_OBJ(); /* match object */
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tp_obj group = TP_DEFAULT(tp_number(0)); /* group */
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regexobject *re = NULL;
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int start;
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int end;
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tp_obj result;
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re = getre(tp, self);
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if (re->re_lastok == NULL) {
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tp_raise(tp_None,
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tp_string("span() only valid after successful match/search"));
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}
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if (group.number.val < 0 || group.number.val > RE_NREGS)
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tp_raise(tp_None, tp_string("IndexError: group index out of range"));
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start = re->re_regs.start[(int)group.number.val];
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end = re->re_regs.end[(int)group.number.val];
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result = tp_list(tp);
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tp_set(tp, result, tp_None, tp_number(start));
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tp_set(tp, result, tp_None, tp_number(end));
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return (result);
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}
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/*
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* compile out a re object
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* repat - regex pattern
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* resyn - regex syntax
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*/
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static tp_obj regex_compile(TP)
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{
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char *error = NULL;
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char const *pat = NULL;
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int size = 0;
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tp_obj reobj_data;
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tp_obj repat = TP_TYPE(TP_STRING); /* pattern */
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tp_obj resyn = TP_DEFAULT(tp_number(RE_SYNTAX_EMACS)); /* syntax */
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tp_obj reobj; /* regex object */
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|
regexobject *re;
|
|
|
|
/*
|
|
* create regex object, its parent is builtin 'object'
|
|
*/
|
|
reobj = tp_object(tp);
|
|
|
|
re = (regexobject *)malloc(sizeof(regexobject));
|
|
if (!re) {
|
|
error = "malloc lower level regex object failed";
|
|
goto finally;
|
|
}
|
|
|
|
re->re_patbuf.buffer = NULL;
|
|
re->re_patbuf.allocated = 0;
|
|
re->re_patbuf.fastmap = (unsigned char *)re->re_fastmap;
|
|
re->re_patbuf.translate = NULL;
|
|
re->re_translate = NULL;
|
|
re->re_lastok = NULL;
|
|
|
|
re->re_errno = 0;
|
|
re->re_syntax = (int)resyn.number.val;
|
|
|
|
pat = repat.string.val;
|
|
size = repat.string.len;
|
|
error = re_compile_pattern((unsigned char *)pat, size, &re->re_patbuf);
|
|
if (error != NULL) {
|
|
LastError = error;
|
|
goto finally;
|
|
}
|
|
|
|
/* regexobject's size as magic */
|
|
reobj_data = tp_data(tp, (int)sizeof(regexobject), re);
|
|
|
|
/*
|
|
* bind to regex object
|
|
*/
|
|
tp_set(tp, reobj, tp_string("search"),
|
|
tp_method(tp, reobj, regex_obj_search));
|
|
tp_set(tp, reobj, tp_string("match"),
|
|
tp_method(tp, reobj, regex_obj_match));
|
|
tp_set(tp, reobj, tp_string("split"),
|
|
tp_method(tp, reobj, regex_obj_split));
|
|
tp_set(tp, reobj, tp_string("findall"),
|
|
tp_method(tp, reobj, regex_obj_findall));
|
|
tp_set(tp, reobj, tp_string("__data__"), reobj_data);
|
|
|
|
tp_set(tp, reobj, tp_string("__name__"),
|
|
tp_string("regular expression object"));
|
|
tp_set(tp, reobj, tp_string("__doc__"), tp_string(
|
|
"regular expression object, support methods:\n"
|
|
"search(str[,pos=0])-search 'str' from 'pos'\n"
|
|
"match(str[,pos=0]) -match 'str' from 'pos'\n"
|
|
));
|
|
|
|
return (reobj);
|
|
|
|
finally:
|
|
tp_raise(tp_None, tp_string(error));
|
|
}
|
|
|
|
/*
|
|
* module level search()
|
|
*/
|
|
static tp_obj regex_search(TP)
|
|
{
|
|
tp_obj repat = TP_OBJ(); /* pattern */
|
|
tp_obj restr = TP_OBJ(); /* string */
|
|
tp_obj resyn = TP_DEFAULT(tp_number(RE_SYNTAX_EMACS));
|
|
tp_obj reobj; /* regex object */
|
|
tp_obj maobj; /* match object */
|
|
|
|
/* compile out regex object */
|
|
tp_params_v(tp, 2, repat, resyn);
|
|
reobj = regex_compile(tp);
|
|
|
|
/* call r.search() */
|
|
tp_params_v(tp, 3, reobj, restr, tp_number(0));
|
|
maobj = regex_obj_search(tp);
|
|
|
|
return (maobj);
|
|
}
|
|
|
|
/*
|
|
* module level match()
|
|
*/
|
|
static tp_obj regex_match(TP)
|
|
{
|
|
tp_obj repat = TP_OBJ(); /* pattern */
|
|
tp_obj restr = TP_OBJ(); /* string */
|
|
tp_obj resyn = TP_DEFAULT(tp_number(RE_SYNTAX_EMACS));
|
|
tp_obj reobj; /* regex object */
|
|
tp_obj maobj; /* match object */
|
|
|
|
/* compile out regex object */
|
|
tp_params_v(tp, 2, repat, resyn);
|
|
reobj = regex_compile(tp);
|
|
|
|
/* call r.search() */
|
|
tp_params_v(tp, 3, reobj, restr, tp_number(0));
|
|
maobj = regex_obj_match(tp);
|
|
|
|
return (maobj);
|
|
}
|
|
|
|
/*
|
|
* module level split()
|
|
* repat - regex pattern
|
|
* restr - regex string
|
|
* maxsplit - max split field, default 0, mean no limit
|
|
*/
|
|
static tp_obj regex_split(TP)
|
|
{
|
|
tp_obj repat = TP_OBJ(); /* pattern */
|
|
tp_obj restr = TP_OBJ(); /* string */
|
|
tp_obj maxsplit = TP_DEFAULT(tp_number(0));
|
|
tp_obj reobj; /* regex object */
|
|
|
|
/* generate a temp regex object */
|
|
tp_params_v(tp, 2, repat, tp_number(RE_SYNTAX_EMACS));
|
|
reobj = regex_compile(tp);
|
|
|
|
tp_params_v(tp, 3, reobj, restr, maxsplit);
|
|
return regex_obj_split(tp);
|
|
}
|
|
|
|
/*
|
|
* module level findall()
|
|
* repat - regex pattern
|
|
* restr - regex string
|
|
* resyn - regex syntax, optional, default RE_SYNTAX_EMAC
|
|
*/
|
|
static tp_obj regex_findall(TP)
|
|
{
|
|
tp_obj repat = TP_OBJ(); /* pattern */
|
|
tp_obj restr = TP_OBJ(); /* string */
|
|
tp_obj resyn = TP_DEFAULT(tp_number(RE_SYNTAX_EMACS));
|
|
tp_obj reobj; /* regex object */
|
|
|
|
/* generate a temp regex object */
|
|
tp_params_v(tp, 2, repat, resyn);
|
|
reobj = regex_compile(tp);
|
|
|
|
tp_params_v(tp, 2, reobj, restr);
|
|
return regex_obj_findall(tp);
|
|
}
|
|
|
|
|
|
/*
|
|
* re mod can only support 'set_syntax', 'get_syntax', and 'compile' functions,
|
|
* 'compile' function will return a 'reobj', and this 'reobj' will support
|
|
* methods 'search', 'match', 'group', 'groupall', el al.
|
|
*/
|
|
void re_init(TP)
|
|
{
|
|
/*
|
|
* module dict for re
|
|
*/
|
|
tp_obj re_mod = tp_dict(tp);
|
|
|
|
/*
|
|
* bind to re module
|
|
*/
|
|
tp_set(tp, re_mod, tp_string("compile"), tp_fnc(tp, regex_compile));
|
|
tp_set(tp, re_mod, tp_string("search"), tp_fnc(tp, regex_search));
|
|
tp_set(tp, re_mod, tp_string("match"), tp_fnc(tp, regex_match));
|
|
tp_set(tp, re_mod, tp_string("split"), tp_fnc(tp, regex_split));
|
|
tp_set(tp, re_mod, tp_string("findall"), tp_fnc(tp, regex_findall));
|
|
tp_set(tp, re_mod, tp_string("AWK_SYNTAX"), tp_number(RE_SYNTAX_AWK));
|
|
tp_set(tp, re_mod, tp_string("EGREP_SYNTAX"), tp_number(RE_SYNTAX_EGREP));
|
|
tp_set(tp, re_mod, tp_string("GREP_SYNTAX"), tp_number(RE_SYNTAX_GREP));
|
|
tp_set(tp, re_mod, tp_string("EMACS_SYNTAX"), tp_number(RE_SYNTAX_EMACS));
|
|
|
|
/*
|
|
* bind special attibutes to re module
|
|
*/
|
|
tp_set(tp, re_mod, tp_string("__name__"),
|
|
tp_string("regular expression module"));
|
|
tp_set(tp, re_mod, tp_string("__file__"), tp_string(__FILE__));
|
|
tp_set(tp, re_mod, tp_string("__doc__"),
|
|
tp_string("simple regular express implementation"));
|
|
|
|
/*
|
|
* bind regex module to tinypy modules[]
|
|
*/
|
|
tp_set(tp, tp->modules, tp_string("re"), re_mod);
|
|
}
|
|
|