WebSVN – wimsdev – Blame – /trunk/wims/src/compare.c

Rev	Author	Line No.	Line
10	reyssat	1	/* Copyright (C) 1998-2003 XIAO, Gang of Universite de Nice - Sophia Antipolis
		2	*
		3	* This program is free software; you can redistribute it and/or modify
		4	* it under the terms of the GNU General Public License as published by
		5	* the Free Software Foundation; either version 2 of the License, or
		6	* (at your option) any later version.
		7	*
		8	* This program is distributed in the hope that it will be useful,
		9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		11	* GNU General Public License for more details.
		12	*
		13	* You should have received a copy of the GNU General Public License
		14	* along with this program; if not, write to the Free Software
		15	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
		16	*/
8880	bpr	17
8185	bpr	18	#include "wims.h"
10	reyssat	19
		20	char *relation_type[]={
		21	"sametext","samecase",
		22	"in", "wordof","itemof","lineof","varof","variableof"
		23	};
		24	#define total_relations (sizeof(relation_type)/sizeof(relation_type[0]))
		25
7673	bpr	26	/* Compares two string. Returns 1 if yes, 0 if no, -1 if error.
		27	* In fact, -1 will occur only if module_error() is modified to
8155	bpr	28	* return instead of abort.
		29	*/
7673	bpr	30	/* TODO: quoted string. */
10	reyssat	31	int compare(char *p, int numeric, int lvl)
		32	{
		33	char p1, p2, pp, pt;
		34	char r1, r2;
		35	int i, l, k, r, neg, gotl;
7673	bpr	36
		37	/* Check global pairs of parentheses */
10	reyssat	38	p2=strip_trailing_spaces(p);
		39	p1=find_word_start(p);
		40	if(lvl==0 && p2-p1>=MAX_LINELEN-1) module_error("parm_too_long");
		41	while(p1=='(' && p2==')' && p2==parend(p1)) {
7673	bpr	42	lvl=0; p1=find_word_start(++p1);
		43	do p2--; while(p2>=p1 && myisspace(*p2));
		44	p2[1]=0;
10	reyssat	45	}
		46	gotl=100; r1=r2=p1; r=-1; neg=0;
		47	for(pp=p1; *pp; pp++) {
7673	bpr	48	if(*pp==')') {badpar: module_error("unmatched_parentheses"); return -1;}
		49	if(*pp=='(') {
		50	pp=parend(pp); if(pp==NULL) goto badpar;
		51	continue;
		52	}
		53	if(gotl>3) {
		54	switch(*pp) {
		55	case '<': {
		56	gotl=3; r1=pp; r2=r1+1; r=102; neg=0;
		57	if(*r2=='=') {r2++; r=103; neg=1;}
		58	if(*r2=='>') {
		59	r2++; neg=1;
		60	if(numeric) r=101; else r=0;
		61	}
		62	break;
		63	}
		64	case '>': {
		65	gotl=3; r1=pp; r2=r1+1; r=103; neg=0;
		66	if(*r2=='=') {r2++; r=102; neg=1;}
		67	break;
		68	}
		69	case '=': {
		70	gotl=3; neg=0; r1=pp; r2=r1+1; if(*r2=='=') r2++;
		71	if(numeric) r=101; else r=0;
		72	break;
		73	}
		74	case '!': {
		75	if(pp[1]=='=') {
		76	gotl=3; r1=pp; r2=pp+2; neg=1;
		77	if(numeric) r=101; else r=0;
		78	}
		79	break;
		80	}
		81	}
		82	if(r2>p1) {
		83	if(lvl==2) break;
		84	pp=r2-1; continue;
		85	}
		86	}
		87	if(!myisspace(*pp)) continue;
		88	pp=find_word_start(pp);
		89	if(gotl>3) {
		90	if(pp[0]=='i' && pp[1]=='s') {k=2; neg=0; goto isnot;}
		91	if(pp[0]=='n' && pp[1]=='o' && pp[2]=='t') {k=3; neg=1; goto isnot;}
		92	goto rel;
		93	isnot:
		94	if(strchr("siwlv",pp[k])==NULL) goto rel;
		95	pt=pp; pp+=k; l=0;
		96	for(i=0;i<total_relations;i++) {
		97	l=strlen(relation_type[i]);
		98	if(strncmp(pp, relation_type[i], l)==0 &&
		99	((!myisalnum(pp[l]) && pp[l]!='_') \|\| pp[l]==0)) break;
		100	}
		101	if(i>=total_relations) {pp--; continue;}
		102	gotl=3; r=i+1; pp+=l; r1=pt; r2=pp;
		103	if(lvl==2) break; else {pp--; continue;}
		104	}
		105	rel:
		106	if(pp!='\|' && pp!='&' && pp!='a' && pp!='o')
		107	{pp--; continue;}
		108	if(gotl>2 &&
		109	((myisspace(pp[3]) && strncmp(pp,"and",3)==0) \|\|
		110	(myisspace(pp[2]) && strncmp(pp,"&&",2)==0))) {
		111	gotl=2; r1=pp; pp=r2=find_word_end(r1);
		112	if(lvl==1) break; else {pp--;continue;}
		113	}
		114	if(gotl>1 && myisspace(pp[2]) &&
		115	(strncmp(pp,"or",2)==0 \|\| strncmp(pp,"\|\|",2)==0)) {
		116	gotl=1; r1=pp; r2=pp=r1+2; break;
		117	}
10	reyssat	118	}
		119	if(gotl>20) {
7673	bpr	120	setvar(error_data_string,"relation not defined");
		121	module_error("comp_syntax"); return -1;
10	reyssat	122	}
7673	bpr	123
10	reyssat	124	switch(gotl) {
7673	bpr	125	case 1: { /* or */
		126	*r1=0; i=compare(p1,numeric,1); if(i) return i;
		127	else return compare(r2,numeric,0);
		128	}
		129	case 2: { /* and */
		130	*r1=0; i=compare(p1,numeric,2); if(i<=0) return i;
		131	else return compare(r2,numeric,1);
		132	}
		133	case 3: { /* atomic comparison */
		134	if(r<100) { /* textual comparison */
8283	bpr	135	static char buf1[MAX_LINELEN+1], buf2[MAX_LINELEN+1];
7673	bpr	136	while(r1>p1 && myisspace(r1[-1])) r1--;
		137	memmove(buf1,p1,r1-p1); buf1[r1-p1]=0;
		138	r2=find_word_start(r2);
		139	while(p2>=r2 && myisspace(*p2)) p2--;
		140	memmove(buf2,r2,p2+1-r2); buf2[p2+1-r2]=0;
		141	substitute(buf1); substitute(buf2);
		142	switch(r) {
		143	case 0: { /* equal */
		144	if(strcmp(buf1,buf2)==0) return 1^neg; else return neg;
		145	}
		146	case 1: { /* sametext */
		147	deaccent(buf1); deaccent(buf2);
		148	if(strcasecmp(bufprep(buf1),bufprep(buf2))==0)
		149	return 1^neg;
		150	else return neg;
		151	}
		152	case 2: { /* samecase */
		153	if(strcmp(bufprep(buf1),bufprep(buf2))==0)
		154	return 1^neg;
		155	else return neg;
		156	}
		157	case 3: { /* in */
		158	if(strstr(buf2,buf1)!=NULL) return 1^neg; else return neg;
		159	}
		160	case 4: { /* wordof */
		161	if(wordchr(buf2,buf1)!=NULL) return 1^neg; else return neg;
		162	}
		163	case 5: { /* itemof */
		164	if(itemchr(buf2,buf1)!=NULL) return 1^neg; else return neg;
		165	}
		166	case 6: { /* lineof */
		167	if(linechr(buf2,buf1)!=NULL) return 1^neg; else return neg;
		168	}
		169	case 7:
		170	case 8: { /* varof */
		171	if(varchr(buf2,buf1)!=NULL) return 1^neg; else return neg;
		172	}
		173	}
		174	}
		175	else { /* numerical comparison */
		176	double d1, d2, sum, diff, prec;
		177	*r1=0;
		178	d1=evalue(p1); d2=evalue(r2);
		179	sum=d1+d2; if(sum<0) sum=-sum;
		180	diff=d1-d2; if(diff<0) diff=-diff;
		181	prec=evalue(getvar("wims_compare_precision")); /* Move string name to header! */
		182	diff=diff*prec;
		183	if(prec>0 && prec<1E10) sum=sum+1/prec;
		184	switch(r) {
		185	case 101: { /* = */
		186	if(sum>=diff) return 1^neg; else return neg;
		187	}
		188	case 102: { /* < */
		189	if(d1<d2) return 1^neg; else return neg;
		190	}
		191	case 103: { /* > */
		192	if(d1>d2) return 1^neg; else return neg;
		193	}
		194	default: break; /* should never occur */
		195	}
		196	}
		197	}
10	reyssat	198	}
8303	bpr	199	internal_error("compare(): this should never happen.");
10	reyssat	200	return -1;
		201	}
		202

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(root)/trunk/wims/src/compare.c – Rev 8880