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