From 813f14a3d4a6e80bbdbd313ffbc4e31cee5e60cd Mon Sep 17 00:00:00 2001
From: SimonFJ20 <simonfromjakobsen@gmail.com>
Date: Wed, 22 Mar 2023 10:57:50 +0100
Subject: [PATCH] add parser error format

---
 src/parser.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/src/parser.c b/src/parser.c
index 062daa1..95b2e77 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -6,8 +6,6 @@
 #include <stdlib.h>
 #include <string.h>
 
-#define PARSER_ERROR_BUFFER_SIZE 512
-
 Expr* error_expr(Position pos, const char* message)
 {
     Expr* node = malloc(sizeof(Expr));
@@ -100,7 +98,7 @@ Expr* parser_error(Parser* parser, const char* message)
          ++i)
         line_width = i;
 
-    char line[PARSER_ERROR_BUFFER_SIZE] = { 0 };
+    char line[512] = { 0 };
 
     char underline_indent[512] = { 0 };
     if (line_width > 0)
@@ -109,10 +107,10 @@ Expr* parser_error(Parser* parser, const char* message)
     char underline[512] = { '^', 0 };
     memset(underline, '^', parser->current.length);
 
-    char formatted[PARSER_ERROR_BUFFER_SIZE];
+    char formatted[512 * 4];
     snprintf(
         formatted,
-        PARSER_ERROR_BUFFER_SIZE,
+        512 * 4,
         "error: %s\n     |\n %-4d|%s\n     |%s%s\n",
         message,
         parser->current.line,
@@ -123,15 +121,25 @@ Expr* parser_error(Parser* parser, const char* message)
     return error_expr(parser_pos(parser), formatted);
 }
 
-Expr* parser_unknown_token_error(Parser* parser) { }
+Expr* parser_unknown_token_error(Parser* parser)
+{
+    char buffer[128] = { 0 };
+    snprintf(
+        buffer, 128, "unknown char '%c'", parser->text[parser->current.index]
+    );
+    return parser_error(parser, buffer);
+}
 
 Expr* parser_operand(Parser* parser)
 {
     if (parser_current_is(parser, TokenTypeInt)) {
         return NULL;
+    } else if (parser_current_is(parser, TokenTypeEof)) {
+        return parser_error(parser, "unexpected end-of-file");
     } else {
+        Expr* error = parser_unknown_token_error(parser);
         parser_step(parser);
-        return parser_error(parser, "invalid token");
+        return error;
     }
 }