add if statements

src/parser/if/if.c

@@ -0,0 +1,68 @@
+#include "if.h"
+#include "../../lexer/token.h"
+#include "../parser.h"
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "../../memory.h"
+
+ParsedValue *parse_if(char *file, DArray *parsed, DArray *tokens,
+                      size_t *index) {
+  (*index)++;
+  error_if_finished(file, tokens, index);
+  Token *token = darray_get(tokens, *index);
+  if (token->type != TOKEN_LPAREN) {
+    fprintf(stderr,
+            "%s:%u:%u error: if statement requires paren for the condition\n",
+            file, token->line, token->column);
+    exit(EXIT_FAILURE);
+  }
+  (*index)++;
+  error_if_finished(file, tokens, index);
+  DArray *parsed_if = checked_malloc(sizeof(DArray));
+  darray_init(parsed_if, sizeof(ParsedConditional));
+  DArray *condition = checked_malloc(sizeof(DArray));
+  darray_init(condition, sizeof(ParsedValue));
+  while ((*index) < tokens->size) {
+    ParsedValue *parsed_code = parse_token(file, parsed, tokens, index, true);
+    if (parsed_code) {
+      darray_push(condition, parsed_code);
+      free(parsed_code);
+    }
+    token = darray_get(tokens, *index);
+    if (token->type == TOKEN_RPAREN)
+      break;
+  }
+  if (token->type != TOKEN_RPAREN) {
+    fprintf(stderr,
+            "%s:%u:%u error: missing closing parenthesis in if condition\n",
+            file, token->line, token->column);
+    exit(EXIT_FAILURE);
+  }
+  (*index)++;
+  error_if_finished(file, tokens, index);
+  ParsedValue *parsed_content = parse_token(file, parsed, tokens, index, true);
+  if (!parsed_content) {
+    fprintf(stderr, "%s:%u:%u error: expected body after if condition\n", file,
+            token->line, token->column);
+    exit(EXIT_FAILURE);
+  }
+  ParsedConditional output_conditional = {condition, parsed_content};
+  darray_push(parsed_if, &output_conditional);
+  ParsedValue *parsedValue = checked_malloc(sizeof(ParsedValue));
+  parsedValue->type = AST_IF;
+  parsedValue->data = parsed_if;
+  return parsedValue;
+}
+
+void free_conditional(void *ptr) {
+  ParsedConditional *conditional = ptr;
+  darray_free(conditional->condition, free_parsed);
+  free_parsed(conditional->content);
+}
+
+void free_parsed_if(void *ptr) {
+  ParsedValue *parsedValue = ptr;
+  DArray *parsed_if = parsedValue->data;
+  darray_free(parsed_if, free_conditional);
+}

src/parser/if/if.h

@@ -0,0 +1,18 @@
+// parser.h
+
+#ifndef iF_H
+#define iF_H
+#include "../parser.h"
+#include "../../lexer/token.h"  // for Token
+
+typedef struct {
+  DArray * condition;
+  ParsedValue * content;
+} ParsedConditional;
+
+ParsedValue *parse_if(char *file, DArray *parsed, DArray *tokens, size_t *index);
+
+void free_parsed_if(void *ptr);
+
+
+#endif // iF_H