Implement parser module and update AST

v0/parser.c

@@ -0,0 +1,45 @@
+#include "parser.h"
+#include <stdlib.h>
+#include <string.h>
+
+Module* parser_parse(TokenStream* ts) {
+	Token t = tokenstream_next(ts);
+	if (t != TOKEN_MODULE) {
+		return NULL;
+	}
+
+	t = tokenstream_next(ts);
+	if (t != TOKEN_IDENTIFIER) {
+		return NULL;
+	}
+
+	TokenInfo info;
+	tokenstream_info(ts, &info);
+
+	Module* module = (Module*)malloc(sizeof(Module));
+	if (module == NULL) return NULL;
+
+	module->name = (char*)malloc(info.text_length + 1);
+	if (module->name == NULL) {
+		free(module);
+		return NULL;
+	}
+
+	memcpy(module->name, info.text, info.text_length);
+	module->name[info.text_length] = '\0';
+
+	t = tokenstream_next(ts);
+	if (t != TOKEN_SEMICOLON) {
+		free(module->name);
+		free(module);
+		return NULL;
+	}
+
+	return module;
+}
+
+void parser_free(Module* module) {
+	if (module == NULL) return;
+	free(module->name);
+	free(module);
+}