1 files changed, 84 insertions, 0 deletions
diff --git a/src/pp.c b/src/pp.c
new file mode 100644
index 0000000..6664879
--- /dev/null
+++ b/src/pp.c
@@ -0,0 +1,84 @@
+#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 ++;
+   }
+}