1 files changed, 81 insertions, 0 deletions
diff --git a/src/lexer.c b/src/lexer.c
new file mode 100644
index 0000000..34db154
--- /dev/null
+++ b/src/lexer.c
@@ -0,0 +1,81 @@
+#define _GNU_SOURCE
+
+#include <ctype.h>
+#include <lexer.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+key_match_t *
+find_next_key(char *buffer)
+{
+  key_match_t *match = calloc(1, sizeof(key_match_t));
+
+  for (size_t i = 0; i < strlen(buffer) - 1; i++) {
+    if (buffer[i] == '{' && buffer[i + 1] == '{')
+      match->offset = i;
+
+    if (i == strlen(buffer) - 1) {
+      free(match);
+      return NULL;
+    }
+  }
+
+  char *subbuffer = buffer + match->offset;
+  for (size_t i = 0; i < strlen(subbuffer) - 1; i++) {
+    if (subbuffer[i] == '}' && subbuffer[i + 1] == '}')
+      match->length = i + 2;
+
+    if (i == strlen(buffer) - 1) {
+      printf("Unterminated Key\n");
+      free(match);
+      return NULL;
+    }
+  }
+
+  return match;
+}
+
+directive_t *
+find_directive(char *content, key_match_t *match)
+{
+  directive_t *directive = (directive_t *) calloc(1, sizeof(directive_t));
+
+  char *buffer = content + match->offset;
+  unsigned int n = 0;
+
+  for (size_t i = 0; i < match->length; i++)
+    switch (buffer[i]) {
+    case '{':
+    case ' ':
+    case '\t':
+    case '\n':
+      n++;
+      break;
+
+    default:
+      goto found_start;
+    }
+
+  return NULL;
+
+found_start:
+  if (strncmp(buffer + n, "include", strlen("include")) == 0) {
+    directive->type = INCLUDE;
+
+    char *operand = NULL;
+    for (size_t i = n + strlen("include");
+         i < match->length - strlen("include");
+         i++)
+      if (isalnum(buffer[i])) {
+        sscanf(buffer + i, "%ms\"", &operand);
+        operand[strlen(operand) - 1] = '\0';
+        break;
+      }
+
+    asprintf((char **) &directive->operands, "%s", operand);
+    free(operand);
+  }
+
+  return directive;
+}