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#include "include/pp.h"
pp_t* pp_init(char* src) {
pp_t* pp;
pp = ecalloc(1, sizeof(pp_t));
pp->src = src;
pp->psrc = (char*) emalloc(1);
pp->psrc[0] = '\0';
pp->state = PP_STATE_REG;
return pp;
}
void pp_destroy(pp_t* pp) {
free(pp);
}
void pp_cpy_char(pp_t* pp) {
int plen = strlen(pp->psrc);
pp->psrc = erealloc(pp->psrc, (plen + 2) * sizeof(char));
pp->psrc[plen] = *pp->src;
pp->psrc[plen + 1] = '\0';
}
void pp_do_reg(pp_t* pp) {
switch (*pp->src) {
case SYNTAX_COMMENT_DELIM:
pp->state = PP_STATE_COM;
break;
case SYNTAX_STR_DELIM:
pp_cpy_char(pp);
pp->state = PP_STATE_STR;
break;
case ' ':
case '\n':
case '\r':
case '\t':
/* skip whitespace */
break;
default:
pp_cpy_char(pp);
}
}
void pp_do_str(pp_t* pp) {
if (pp->state == PP_STATE_ESC) {
pp_cpy_char(pp);
pp->state = PP_STATE_STR;
} else {
if (*pp->src == SYNTAX_ESC) {
pp_cpy_char(pp);
pp->state = PP_STATE_ESC;
} else if (*pp->src == SYNTAX_STR_DELIM) {
pp_cpy_char(pp);
pp->state = PP_STATE_REG;
}
else {
pp_cpy_char(pp);
}
}
}
void pp_do_com(pp_t* pp) {
if (*pp->src == SYNTAX_COMMENT_DELIM) {
pp->state = PP_STATE_REG;
}
/* let pp_run skip chars in comments */
}
void pp_run(pp_t* pp) {
while (*pp->src) {
if (pp->state == PP_STATE_REG) { pp_do_reg(pp); }
else if (pp->state == PP_STATE_STR || pp->state == PP_STATE_ESC) { pp_do_str(pp); }
else if (pp->state == PP_STATE_COM) { pp_do_com(pp); }
pp->src ++;
}
}
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