start implimenting a parser

src/parser/string/string.c

@@ -0,0 +1,78 @@
+#include "string.h"
+#include "../../lexer/token.h"
+
+#include <cjson/cJSON.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+char *swap_quotes(const char *input) {
+  size_t len = strlen(input);
+  char *result = malloc(len + 1);
+  if (!result)
+    return NULL;
+
+  for (size_t i = 0; i < len; ++i) {
+    if (input[i] == '"')
+      result[i] = '\'';
+    else if (input[i] == '\'')
+      result[i] = '"';
+    else
+      result[i] = input[i];
+  }
+  result[len] = '\0';
+  return result;
+}
+
+char *unquote(const char *str) {
+  if (*str == '\0')
+    return NULL;
+
+  char quote = str[0];
+  char *swapped = NULL;
+  char *unescaped = NULL;
+
+  if (quote == '\'') {
+    swapped = swap_quotes(str);
+    if (!swapped)
+      return NULL;
+    str = swapped;
+  }
+
+  cJSON *json = cJSON_Parse(str);
+  if (!json || !cJSON_IsString(json)) {
+    if (swapped)
+      free(swapped);
+    return NULL;
+  }
+
+  // Copy unescaped string before freeing JSON object
+  const char *decoded = cJSON_GetStringValue(json);
+  if (!decoded) {
+    cJSON_Delete(json);
+    if (swapped)
+      free(swapped);
+    return NULL;
+  }
+
+  unescaped = strdup(decoded);
+  cJSON_Delete(json);
+  if (swapped)
+    free(swapped);
+
+  // If input was single-quoted, swap quotes back in the output
+  if (quote == '\'') {
+    char *final = swap_quotes(unescaped);
+    free(unescaped);
+    return final;
+  }
+
+  return unescaped;
+}
+
+TaggedValue parse_string(Token token) {
+  return (TaggedValue){
+    TYPE_STRING,
+    unquote(token.value)
+  };
+}

src/parser/string/string.h

@@ -0,0 +1,8 @@
+#include "../../lexer/token.h"
+#include "../taggedValue.h"
+
+char *swap_quotes(const char *input);
+
+char *unquote(const char *str);
+
+TaggedValue parse_string(Token token);