Moved yyerror to parser and added detailed errors using bison's options

Author: Fiwo735

src/parser.y

@@ -8,6 +8,8 @@
 	#include "ast.hpp"
 	using namespace ast;
 
+	extern int yylineno;
+	extern char* yytext;
 	extern Node* g_root;
 	extern FILE* yyin;
 
@@ -16,6 +18,9 @@
 	int yylex_destroy(void);
 }
 
+%define parse.error detailed
+%define parse.lac full
+
 %union {
   Node*				    node;
   NodeList*			  node_list;
@@ -33,6 +38,7 @@
 %token CHAR SHORT INT LONG SIGNED UNSIGNED FLOAT DOUBLE CONST VOLATILE VOID
 %token STRUCT UNION ENUM ELLIPSIS
 %token CASE DEFAULT IF ELSE SWITCH WHILE DO FOR GOTO CONTINUE BREAK RETURN
+%token UNKNOWN
 
 %type <node> translation_unit external_declaration function_definition primary_expression postfix_expression
 %type <node> unary_expression cast_expression multiplicative_expression additive_expression shift_expression relational_expression
@@ -185,6 +191,13 @@ expression
 
 %%
 
+void yyerror (const char *s)
+{
+  std::cerr << "Error: " << s << " at line " << yylineno;
+  std::cerr << " near '" << yytext << "'" << std::endl;
+  std::exit(1);
+}
+
 Node* g_root;
 
 NodePtr ParseAST(std::string file_name)

src/parser_full.y.example

@@ -4,6 +4,8 @@
 	#include "ast.hpp"
 	using namespace ast;
 
+	extern int yylineno;
+	extern char* yytext;
 	extern Node* g_root;
 	extern FILE* yyin;
 
@@ -12,6 +14,9 @@
 	int yylex_destroy(void);
 }
 
+%define parse.error detailed
+%define parse.lac full
+
 // Represents the value associated with any kind of AST node.
 %union {
   Node*        	node;
@@ -30,6 +35,7 @@
 %token CHAR SHORT INT LONG SIGNED UNSIGNED FLOAT DOUBLE CONST VOLATILE VOID
 %token STRUCT UNION ENUM ELLIPSIS
 %token CASE DEFAULT IF ELSE SWITCH WHILE DO FOR GOTO CONTINUE BREAK RETURN
+%token UNKNOWN
 
 %type <node> translation_unit external_declaration function_definition primary_expression postfix_expression argument_expression_list
 %type <node> unary_expression cast_expression multiplicative_expression additive_expression shift_expression relational_expression
@@ -462,6 +468,13 @@ jump_statement
 
 %%
 
+void yyerror (const char *s)
+{
+  std::cerr << "Error: " << s << " at line " << yylineno;
+  std::cerr << " near '" << yytext << "'" << std::endl;
+  std::exit(1);
+}
+
 Node* g_root;
 
 NodePtr ParseAST(std::string file_name)