Add error logging and corresponding tests for parser syntax errors

v0/parser.c

@@ -1,25 +1,32 @@
 #include "parser.h"
+#include "log.h"
 #include <stdlib.h>
 #include <string.h>
+#include <stdio.h>
 
 Module* parser_parse(TokenStream* ts) {
 	Token t = tokenstream_next(ts);
 	if (t.token != TOKEN_MODULE) {
+		log_on_line(&t.location, t.location.column_end, "expected 'module' keyword");
 		return NULL;
 	}
 
 	t = tokenstream_next(ts);
 	if (t.token != TOKEN_IDENTIFIER) {
+		log_on_line(&t.location, t.location.column_end, "expected module name");
 		return NULL;
 	}
 
 	Module* module = (Module*)malloc(sizeof(Module));
-	if (module == NULL) return NULL;
+	if (module == NULL) {
+		fprintf(stderr, "Out of memory\n");
+		exit(1);
+	}
 
 	module->name = (char*)malloc(t.text.length + 1);
 	if (module->name == NULL) {
-		free(module);
-		return NULL;
+		fprintf(stderr, "Out of memory\n");
+		exit(1);
 	}
 
 	memcpy(module->name, t.text.data, t.text.length);
@@ -27,8 +34,8 @@ Module* parser_parse(TokenStream* ts) {
 
 	t = tokenstream_next(ts);
 	if (t.token != TOKEN_SEMICOLON) {
-		free(module->name);
-		free(module);
+		log_on_line(&t.location, t.location.column_end, "expected ';' after module name");
+		parser_free(module);
 		return NULL;
 	}
 
@@ -43,21 +50,22 @@ Module* parser_parse(TokenStream* ts) {
 
 		ImportDeclaration* new_imports = realloc(module->imports, (module->import_count + 1) * sizeof(ImportDeclaration));
 		if (!new_imports) {
-			parser_free(module);
-			return NULL;
+			fprintf(stderr, "Out of memory\n");
+			exit(1);
 		}
 		module->imports = new_imports;
 
 		t = tokenstream_next(ts);
 		if (t.token != TOKEN_IDENTIFIER) {
+			log_on_line(&t.location, t.location.column_end, "expected module name to import");
 			parser_free(module);
 			return NULL;
 		}
 
 		module->imports[module->import_count].module_name = (char*)malloc(t.text.length + 1);
 		if (!module->imports[module->import_count].module_name) {
-			parser_free(module);
-			return NULL;
+			fprintf(stderr, "Out of memory\n");
+			exit(1);
 		}
 		memcpy(module->imports[module->import_count].module_name, t.text.data, t.text.length);
 		module->imports[module->import_count].module_name[t.text.length] = '\0';
@@ -65,6 +73,7 @@ Module* parser_parse(TokenStream* ts) {
 
 		t = tokenstream_next(ts);
 		if (t.token != TOKEN_SEMICOLON) {
+			log_on_line(&t.location, t.location.column_end, "expected ';' after import");
 			parser_free(module);
 			return NULL;
 		}