Switch to a custom source location type

libs/ast/include/pslang/ast/location.hpp

@@ -0,0 +1,59 @@
+#pragma once
+
+#include <string_view>
+#include <ostream>
+
+namespace pslang::ast
+{
+
+	struct location
+	{
+		struct position
+		{
+			std::size_t line = 1;
+			std::size_t column = 1;
+		};
+
+		std::string_view filename;
+		position begin = {};
+		position end = {};
+
+		void step()
+		{
+			begin = end;
+		}
+
+		void move_lines(std::size_t count)
+		{
+			if (count > 0)
+			{
+				end.column = 1;
+				end.line = add(end.line, count, 1);
+			}
+		}
+
+		void move_columns(std::size_t count)
+		{
+			end.column = add(end.column, count, 1);
+		}
+
+		static std::size_t add(std::size_t lhs, std::size_t rhs, std::size_t min)
+		{
+		  return lhs + rhs < min ? min : lhs + rhs;
+		}
+	};
+
+	inline std::ostream & operator << (std::ostream & out, location const & location)
+	{
+		out << location.filename << ':' << location.begin.line << '.' << location.begin.column;
+
+		std::size_t end_column = std::max<std::size_t>(1, location.end.column) - 1;
+		if (location.begin.line < location.end.line)
+			out << '-' << location.end.line << '.' << end_column;
+		else if (location.begin.column < end_column)
+			out << '-' << end_column;
+
+		return out;
+	}
+
+}

libs/parser/CMakeLists.txt

@@ -10,8 +10,6 @@ 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/context.hpp

@@ -2,19 +2,19 @@
 
 #include <pslang/parser/indented_statement.hpp>
 
+namespace pslang::ast
+{
+
+	struct location;
+
+}
+
 namespace pslang::parser
 {
 
-	namespace bison
-	{
-
-		class location;
-
-	}
-
 	struct context
 	{
-		bison::location & location;
+		ast::location & location;
 		indented_statement_list & result;
 	};
 

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

@@ -1,8 +1,9 @@
 #pragma once
 
-#include <pslang/parser/location.hpp>
+#include <pslang/ast/location.hpp>
 
 #include <exception>
+#include <string>
 
 namespace pslang::parser
 {
@@ -10,13 +11,12 @@ namespace pslang::parser
 	struct parse_error
 		: std::exception
 	{
-		parse_error(std::string message, bison::location location)
+		parse_error(std::string message, ast::location location)
 			: message_(std::move(message))
-			, filename_(*location.begin.filename)
+			, filename_(location.filename)
 			, location_(location)
 		{
-			location_.begin.filename = &filename_;
+			location_.filename = filename_;
-			location_.end.filename = &filename_;
 		}
 
 		char const * what() const noexcept
@@ -24,7 +24,7 @@ namespace pslang::parser
 			return message_.c_str();
 		}
 
-		bison::location location() const noexcept
+		ast::location location() const noexcept
 		{
 			return location_;
 		}
@@ -32,7 +32,7 @@ namespace pslang::parser
 	private:
 		std::string message_;
 		std::string filename_;
-		bison::location location_;
+		ast::location location_;
 	};
 
 }

libs/parser/rules/pslang.l

@@ -9,7 +9,7 @@
 using bp = ::pslang::parser::bison::parser;
 
 #define YY_DECL bp::symbol_type yylex(::pslang::parser::context& ctx)
-#define YY_USER_ACTION  ctx.location.columns(yyleng);
+#define YY_USER_ACTION  ctx.location.move_columns(yyleng);
 
 %}
 
@@ -49,7 +49,7 @@ f64  { return bp::make_f64(ctx.location); }
 
 [a-zA-Z_]+[a-zA-Z0-9_]* { return bp::make_name(yytext, ctx.location); }
 
-"\n" { ctx.location.lines(1); return bp::make_newline(ctx.location); }
+"\n" { ctx.location.move_lines(1); return bp::make_newline(ctx.location); }
 "\t" { return bp::make_indent(ctx.location); }
 "="  { return bp::make_assignment(ctx.location); }
 ":"  { return bp::make_colon(ctx.location); }

libs/parser/rules/pslang.y

@@ -4,8 +4,7 @@
 
 %language "C++"
 %define api.namespace {pslang::parser::bison}
-%define api.location.file "pslang/parser/location.hpp"
+%define api.location.type { ::pslang::ast::location }
-%define api.location.include "<pslang/parser/location.hpp>"
 
 %define api.token.raw
 %define api.token.constructor
@@ -33,6 +32,7 @@ void yyerror(char const * s)
 %code requires {
 
 #include <pslang/ast/statement.hpp>
+#include <pslang/ast/location.hpp>
 #include <pslang/parser/indented_statement.hpp>
 
 namespace pslang::parser {

libs/parser/source/parser.cpp

@@ -1,6 +1,7 @@
 #include <pslang/parser/parser.hpp>
 #include <pslang/parser/context.hpp>
 #include <pslang/parser/indented_statement.hpp>
+#include <pslang/ast/location.hpp>
 #include "gen_parser.hpp"
 #include "gen_lexer.hpp"
 
@@ -15,7 +16,7 @@ namespace pslang::parser
 		if (!yyin)
 			throw std::system_error(std::make_error_code(static_cast<std::errc>(errno)));
 
-		bison::location location(&filename);
+		ast::location location{filename};
 		indented_statement_list result;
 		context ctx{location, result};