Add dedicated parse_error exception

apps/interpreter/source/main.cpp

@@ -1,11 +1,12 @@
 #include <pslang/parser/parser.hpp>
+#include <pslang/parser/error.hpp>
 #include <pslang/interpreter/interpreter.hpp>
 #include <pslang/ast/statement.hpp>
 
 #include <iostream>
 #include <cstring>
 
-int main(int argc, char ** argv)
+int main(int argc, char ** argv) try
 {
 	if (argc == 1)
 	{
@@ -43,3 +44,7 @@ int main(int argc, char ** argv)
 			interpreter::dump(std::cout, context);
 	}
 }
+catch (pslang::parser::parse_error const & error)
+{
+	std::cerr << "Parse error at " << error.location() << ":\n    " << error.what() << std::endl;
+}

libs/parser/CMakeLists.txt

@@ -10,6 +10,8 @@ set(PSLANG_LEXER_SOURCE_FILE "${CMAKE_CURRENT_BINARY_DIR}/generated/gen_lexer.cp
 set(PSLANG_PARSER_HEADER_FILE "${CMAKE_CURRENT_BINARY_DIR}/generated/gen_parser.hpp")
 set(PSLANG_PARSER_SOURCE_FILE "${CMAKE_CURRENT_BINARY_DIR}/generated/gen_parser.cpp")
 
+file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/generated/pslang/parser")
+
 flex_target(
 	generate-pslang-lexer
 	${PSLANG_LEXER_RULES_FILE}

libs/parser/include/pslang/parser/error.hpp

@@ -0,0 +1,38 @@
+#pragma once
+
+#include <pslang/parser/location.hpp>
+
+#include <exception>
+
+namespace pslang::parser
+{
+
+	struct parse_error
+		: std::exception
+	{
+		parse_error(std::string message, bison::location location)
+			: message_(std::move(message))
+			, filename_(*location.begin.filename)
+			, location_(location)
+		{
+			location_.begin.filename = &filename_;
+			location_.end.filename = &filename_;
+		}
+
+		char const * what() const noexcept
+		{
+			return message_.c_str();
+		}
+
+		bison::location location() const noexcept
+		{
+			return location_;
+		}
+
+	private:
+		std::string message_;
+		std::string filename_;
+		bison::location location_;
+	};
+
+}

libs/parser/rules/pslang.l

@@ -4,6 +4,7 @@
 
 #include "gen_parser.hpp"
 #include <pslang/parser/context.hpp>
+#include <pslang/parser/error.hpp>
 
 using bp = ::pslang::parser::bison::parser;
 
@@ -80,4 +81,4 @@ f64  { return bp::make_f64(ctx.location); }
 
 <<EOF>> { return bp::make_end(ctx.location); }
 
-. { throw std::runtime_error(std::string("Unexpected character: ") + yytext); }
+. { throw ::pslang::parser::parse_error("unexpected character \"" + std::string(yytext) + "\"", ctx.location); }

libs/parser/rules/pslang.y

@@ -4,7 +4,8 @@
 
 %language "C++"
 %define api.namespace {pslang::parser::bison}
-%define api.location.file none
+%define api.location.file "pslang/parser/location.hpp"
+%define api.location.include "<pslang/parser/location.hpp>"
 
 %define api.token.raw
 %define api.token.constructor
@@ -45,6 +46,7 @@ struct context;
 %code {
 
 #include <pslang/parser/context.hpp>
+#include <pslang/parser/error.hpp>
 
 #include <stdexcept>
 #include <sstream>
@@ -279,7 +281,5 @@ literal
 
 void pslang::parser::bison::parser::error(location_type const& location, std::string const& message)
 {
-	std::ostringstream os;
-	os << "Error parsing at " << location << ": " << message << "\n";
-	throw std::runtime_error(os.str());
+	throw ::pslang::parser::parse_error(message, location);
 }