// Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors // Licensed under the MIT License: // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to deal // in the Software without restriction, including without limitation the rights // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN // THE SOFTWARE. #ifndef CAPNP_COMPILER_LEXER_H_ #define CAPNP_COMPILER_LEXER_H_ #if defined(__GNUC__) && !defined(CAPNP_HEADER_WARNINGS) #pragma GCC system_header #endif #include <capnp/compiler/lexer.capnp.h> #include <kj/parse/common.h> #include <kj/arena.h> #include "error-reporter.h" namespace capnp { namespace compiler { bool lex(kj::ArrayPtr<const char> input, LexedStatements::Builder result, ErrorReporter& errorReporter); bool lex(kj::ArrayPtr<const char> input, LexedTokens::Builder result, ErrorReporter& errorReporter); // Lex the given source code, placing the results in `result`. Returns true if there // were no errors, false if there were. Even when errors are present, the file may have partial // content which can be fed into later stages of parsing in order to find more errors. // // There are two versions, one that parses a list of statements, and one which just parses tokens // that might form a part of one statement. In other words, in the later case, the input should // not contain semicolons or curly braces, unless they are in string literals of course. class Lexer { // Advanced lexer interface. This interface exposes the inner parsers so that you can embed them // into your own parsers. public: Lexer(Orphanage orphanage, ErrorReporter& errorReporter); // `orphanage` is used to allocate Cap'n Proto message objects in the result. `inputStart` is // a pointer to the beginning of the input, used to compute byte offsets. ~Lexer() noexcept(false); class ParserInput: public kj::parse::IteratorInput<char, const char*> { // Like IteratorInput<char, const char*> except that positions are measured as byte offsets // rather than pointers. public: ParserInput(const char* begin, const char* end) : IteratorInput<char, const char*>(begin, end), begin(begin) {} explicit ParserInput(ParserInput& parent) : IteratorInput<char, const char*>(parent), begin(parent.begin) {} inline uint32_t getBest() { return IteratorInput<char, const char*>::getBest() - begin; } inline uint32_t getPosition() { return IteratorInput<char, const char*>::getPosition() - begin; } private: const char* begin; }; template <typename Output> using Parser = kj::parse::ParserRef<ParserInput, Output>; struct Parsers { Parser<kj::Tuple<>> emptySpace; Parser<Orphan<Token>> token; Parser<kj::Array<Orphan<Token>>> tokenSequence; Parser<Orphan<Statement>> statement; Parser<kj::Array<Orphan<Statement>>> statementSequence; }; const Parsers& getParsers() { return parsers; } private: Orphanage orphanage; kj::Arena arena; Parsers parsers; }; } // namespace compiler } // namespace capnp #endif // CAPNP_COMPILER_LEXER_H_