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/****************************************************************************
* Expression matching.
* Copyright (C) 2004 Joe Wingbermuehle
****************************************************************************/
#include "jwm.h"
#include "match.h"
typedef struct MatchStateType {
const char *pattern;
const char *expression;
int patternOffset;
int expressionOffset;
int expressionLength;
} MatchStateType;
static int DoMatch(MatchStateType state);
/****************************************************************************
****************************************************************************/
int
Match(const char *pattern, const char *expression)
{
MatchStateType state;
if(!pattern && !expression) {
return 1;
} else if(!pattern || !expression) {
return 0;
}
state.pattern = pattern;
state.expression = expression;
state.patternOffset = 0;
state.expressionOffset = 0;
state.expressionLength = strlen(expression);
return DoMatch(state);
}
/****************************************************************************
****************************************************************************/
int
DoMatch(MatchStateType state)
{
char p, e;
for(;;) {
p = state.pattern[state.patternOffset];
e = state.expression[state.expressionOffset];
if(p == 0 && e == 0) {
return 1;
} else if(p == 0 || e == 0) {
return 0;
}
switch(p) {
case '*':
++state.patternOffset;
while(state.expressionOffset < state.expressionLength) {
if(DoMatch(state)) {
return 1;
}
++state.expressionOffset;
}
return 0;
default:
if(p == e) {
++state.patternOffset;
++state.expressionOffset;
break;
} else {
return 0;
}
}
}
}
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