Added comments
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src/modal.c
23
src/modal.c
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@ -105,15 +105,16 @@ write_rule(Rule *r, char *s, int create)
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static int
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static int
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apply_rule(Rule *r, char *s)
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apply_rule(Rule *r, char *s)
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{
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{
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unsigned int i;
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unsigned int i, id;
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char c, *a = r->a, *regs[0x08], *reg;
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char c, *a = r->a, *regs[0x08], *reg;
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/* phase: clean registers */
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/* phase: clean registers */
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for(i = 0; i < r->ptr; i++) regs[i] = NULL;
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for(i = 0; i < r->ptr; i++)
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regs[i] = NULL;
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/* phase: match rule */
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/* phase: match rule */
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while((c = *a)) {
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while((c = *a)) {
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if(c == '?') {
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if(c == '?') {
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char *pcap = walk(s);
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char *pcap = walk(s);
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unsigned int id = *(++a) - '0';
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id = *(++a) - '0';
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if((reg = regs[id])) { /* reg cmp */
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if((reg = regs[id])) { /* reg cmp */
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char *rcap = walk(reg), *pp = s;
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char *rcap = walk(reg), *pp = s;
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while(reg < rcap || pp < pcap)
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while(reg < rcap || pp < pcap)
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@ -133,11 +134,10 @@ apply_rule(Rule *r, char *s)
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char *b = r->b, *origin = dst_;
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char *b = r->b, *origin = dst_;
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while((c = *b++)) {
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while((c = *b++)) {
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if(c == '?') {
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if(c == '?') {
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unsigned int id = *b - '0';
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id = *b - '0';
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if(id < 9 && (reg = regs[id])) {
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if(id < 9 && (reg = regs[id]))
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b++;
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b++, write_reg(r->reg[id], reg);
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if(!write_reg(r->reg[id], reg) && dst_ != origin) dst_--;
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else
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} else
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*dst_++ = c;
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*dst_++ = c;
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} else
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} else
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*dst_++ = c;
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*dst_++ = c;
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@ -206,19 +206,22 @@ rewrite(void)
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while((c = *s)) {
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while((c = *s)) {
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if(spacer(last)) {
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if(spacer(last)) {
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Rule *r = NULL;
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Rule *r = NULL;
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if(c == '<' && s[1] == '>') { /* rule */
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/* phase: rule */
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if(c == '<' && s[1] == '>') {
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r = rules_++;
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r = rules_++;
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s = compile_rule(r, rules_ - rules - 1, s + 2);
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s = compile_rule(r, rules_ - rules - 1, s + 2);
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while(*s == ' ') s++;
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while(*s == ' ') s++;
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return write_rule(r, s, 1);
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return write_rule(r, s, 1);
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}
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}
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if(c == '?' && s[1] == '(') { /* lambda */
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/* phase: lambda */
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if(c == '?' && s[1] == '(') {
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cap = walk(s + 1);
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cap = walk(s + 1);
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compile_rule(&lambda, -1, s + 2);
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compile_rule(&lambda, -1, s + 2);
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s = cap;
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s = cap;
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while(*s == ' ') s++;
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while(*s == ' ') s++;
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return apply_rule(&lambda, s);
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return apply_rule(&lambda, s);
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}
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}
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/* phase: match */
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for(r = rules; r < rules_; r++)
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for(r = rules; r < rules_; r++)
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if(apply_rule(r, s)) return 1;
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if(apply_rule(r, s)) return 1;
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}
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}
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