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/* Copyright (c) 1994 Sun Wu, Udi Manber, Burra Gopal. All Rights Reserved. */
#include "agrep.h"
#include "checkfile.h"
extern int errno;
extern CHAR Progname[MAXNAME];
extern int SGREP, PAT_FILE, PAT_BUFFER, EXITONERROR, SIMPLEPATTERN,
CONSTANT, D, NOUPPER, JUMP, I, LINENUM, INVERSE, WORDBOUND, WHOLELINE,
SILENT, DNA, BESTMATCH;
/* Make it an interface routine that tells you whether mgrep can be used for the pattern or not: must sneak and access global variable D though... */
int
checksg(Pattern, D, set)
CHAR *Pattern;
int D;
int set; /* should I set flags SGREP and DNA? not if called from glimpse via library */
{
char c;
int i, m;
int NOTSGREP = 0;
if (set) SGREP = OFF;
m = strlen(Pattern);
#if DEBUG
fprintf(stderr, "checksg: len=%d, pat=%s, pat[len]=%d\n", m, Pattern, Pattern[m]);
#endif
if(!(PAT_FILE || PAT_BUFFER) && (m <= D)) {
fprintf(stderr, "%s: size of pattern '%s' must be > #of errors %d\n", Progname, Pattern, D);
if (!EXITONERROR) {
errno = AGREP_ERROR;
return -1;
}
else exit(2);
}
SIMPLEPATTERN = ON;
for (i=0; i < m; i++)
{
switch(Pattern[i])
{
case ';' :
SIMPLEPATTERN = OFF;
goto outoffor;
case ',' :
SIMPLEPATTERN = OFF;
goto outoffor;
case '.' :
SIMPLEPATTERN = OFF;
goto outoffor;
case '*' :
SIMPLEPATTERN = OFF;
goto outoffor;
case '-' :
SIMPLEPATTERN = OFF;
goto outoffor;
case '[' :
SIMPLEPATTERN = OFF;
goto outoffor;
case ']' :
SIMPLEPATTERN = OFF;
goto outoffor;
case '(' :
SIMPLEPATTERN = OFF;
goto outoffor;
case ')' :
SIMPLEPATTERN = OFF;
goto outoffor;
case '<' :
SIMPLEPATTERN = OFF;
goto outoffor;
case '>' :
SIMPLEPATTERN = OFF;
goto outoffor;
case '^' :
/* NOTSGREP = 1; sgrep does it; bg 4/27/97 */
if(D > 0) {
SIMPLEPATTERN = OFF;
goto outoffor;
}
break;
case '$' :
/* NOTSGREP = 1; sgrep does it; bg 4/27/97 */
if(D > 0) {
SIMPLEPATTERN = OFF;
goto outoffor;
}
break;
case '|' :
SIMPLEPATTERN = OFF;
goto outoffor;
case '#' :
SIMPLEPATTERN = OFF;
goto outoffor;
case '{':
SIMPLEPATTERN = OFF;
goto outoffor;
case '}':
SIMPLEPATTERN = OFF;
goto outoffor;
case '~':
SIMPLEPATTERN = OFF;
goto outoffor;
case '\\' :
{ /* Should I DO the left shift Pattern including Pattern[m] which is '\0', or just ignore the next character after '\\'????? */
if (set) { /* preprocess and maskgen figure out what to do */
i++; /* in addition to for loop ++ */
}
else { /* maskgen won't be called if we can help it, so shift it to make it verbatim */
/*
int j;
for (j=i; j<m; j++) Pattern[j] = Pattern[j+1];
m --;
*/
i++;
}
break;
}
default :
break;
}
}
outoffor:
if (CONSTANT) SIMPLEPATTERN = ON;
if (SIMPLEPATTERN == OFF) return 0;
if (BESTMATCH) return 0; /* can have errors, not simple */
if (!set && (D>0)) return 0; /* errors, not simple */
if (NOUPPER && (D>0)) return 0; /* errors, not simple */
if (JUMP == ON) return 0; /* I, S, D costs, not simple */
if (I == 0) return 0; /* I has 0 cost not 1, not simple */
if (LINENUM) return 0; /* can't use mgrep, so not simple */
if (WORDBOUND && (D > 0)) return 0; /* errors, not simple */
if (WHOLELINE && (D > 0)) return 0; /* errors, not simple */
if (SILENT) return 1; /* dont care output, so dont care pat */
if (set) {
if (!NOTSGREP || CONSTANT) SGREP = ON;
if (m >= 16) DNA = ON;
for(i=0; i<m; i++) {
c = Pattern[i];
if(c == 'a' || c == 'c' || c == 't' || c == 'g' ) ;
else DNA = OFF;
}
}
#if 0
/* Ditch this: sgrep does it internally anyway */
if (SGREP) { /* => set MUST be on */
for (i=0; i < m; i++)
{
switch(Pattern[i])
{
case '\\' :
for (j=i; j<m; j++) Pattern[j] = Pattern[j+1];
m --;
break;
default :
break;
}
}
}
#endif /*0*/
return 1; /* remains simple */
}
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