From 92955d56dde9394e1efaca565e553e99b0026b2d Mon Sep 17 00:00:00 2001
From: Kayne Ruse <kayneruse@gmail.com>
Date: Sat, 2 Nov 2024 14:39:59 +1100
Subject: [PATCH] Added a nice error message

---
 source/toy_lexer.h  |  6 +++---
 source/toy_parser.c | 13 ++++++++++---
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/source/toy_lexer.h b/source/toy_lexer.h
index 0b589de..30d3cae 100644
--- a/source/toy_lexer.h
+++ b/source/toy_lexer.h
@@ -21,8 +21,8 @@ typedef struct {
 
 TOY_API void Toy_bindLexer(Toy_Lexer* lexer, const char* source);
 TOY_API Toy_Token Toy_private_scanLexer(Toy_Lexer* lexer);
-TOY_API void Toy_private_printToken(Toy_Token* token); //debugging
 
-//util
-#define TOY_BLANK_TOKEN() ((Toy_Token){TOY_TOKEN_NULL, 0, 0, NULL})
+TOY_API const char* Toy_private_findKeywordByType(const Toy_TokenType type);
+TOY_API Toy_TokenType Toy_private_findTypeByKeyword(const char* keyword);
+TOY_API void Toy_private_printToken(Toy_Token* token);
 
diff --git a/source/toy_parser.c b/source/toy_parser.c
index 25aaf2c..f3c43e1 100644
--- a/source/toy_parser.c
+++ b/source/toy_parser.c
@@ -570,7 +570,14 @@ static void parsePrecedence(Toy_Bucket** bucketHandle, Toy_Parser* parser, Toy_A
 	ParsingRule prefix = getParsingRule(parser->previous.type)->prefix;
 
 	if (prefix == NULL) {
-		printError(parser, parser->previous, "Expected expression");
+		//make a nice error message
+		if (Toy_private_findKeywordByType(parser->previous.type)) {
+			printError(parser, parser->previous, "Found reserved keyword instead");
+		}
+		else {
+			printError(parser, parser->previous, "Expected expression");
+		}
+
 		Toy_private_emitAstError(bucketHandle, rootHandle);
 		return;
 	}
@@ -780,8 +787,8 @@ Toy_Ast* Toy_scanParser(Toy_Bucket** bucketHandle, Toy_Parser* parser) {
 void Toy_resetParser(Toy_Parser* parser) {
 	parser->lexer = NULL;
 
-	parser->current = TOY_BLANK_TOKEN();
-	parser->previous = TOY_BLANK_TOKEN();
+	parser->current = ((Toy_Token){TOY_TOKEN_NULL, 0, 0, NULL});
+	parser->previous = ((Toy_Token){TOY_TOKEN_NULL, 0, 0, NULL});
 
 	parser->error = false;
 	parser->panic = false;