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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351636 91177308-0d34-0410-b5e6-96231b3b80d8
112 lines
2.7 KiB
C++
112 lines
2.7 KiB
C++
//===-- ResourceScriptCppFilter.cpp ----------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===---------------------------------------------------------------------===//
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//
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// This file implements an interface defined in ResourceScriptCppFilter.h.
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//
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//===---------------------------------------------------------------------===//
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#include "ResourceScriptCppFilter.h"
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#include "llvm/ADT/StringExtras.h"
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#include <vector>
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using namespace llvm;
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namespace {
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class Filter {
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public:
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explicit Filter(StringRef Input) : Data(Input), DataLength(Input.size()) {}
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std::string run();
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private:
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// Parse the line, returning whether the line should be included in
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// the output.
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bool parseLine(StringRef Line);
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bool streamEof() const;
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StringRef Data;
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size_t DataLength;
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size_t Pos = 0;
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bool Outputting = true;
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};
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std::string Filter::run() {
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std::vector<StringRef> Output;
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while (!streamEof() && Pos != StringRef::npos) {
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size_t LineStart = Pos;
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Pos = Data.find_first_of("\r\n", Pos);
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Pos = Data.find_first_not_of("\r\n", Pos);
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StringRef Line = Data.take_front(Pos).drop_front(LineStart);
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if (parseLine(Line))
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Output.push_back(Line);
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}
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return llvm::join(Output, "");
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}
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bool Filter::parseLine(StringRef Line) {
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Line = Line.ltrim();
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if (!Line.consume_front("#")) {
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// A normal content line, filtered according to the current mode.
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return Outputting;
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}
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// Found a preprocessing directive line. From here on, we always return
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// false since the preprocessing directives should be filtered out.
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Line.consume_front("line");
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if (!Line.startswith(" "))
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return false; // Not a line directive (pragma etc).
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// #line 123 "path/file.h"
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// # 123 "path/file.h" 1
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Line =
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Line.ltrim(); // There could be multiple spaces after the #line directive
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size_t N;
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if (Line.consumeInteger(10, N)) // Returns true to signify an error
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return false;
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Line = Line.ltrim();
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if (!Line.consume_front("\""))
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return false; // Malformed line, no quote found.
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// Split the string at the last quote (in case the path name had
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// escaped quotes as well).
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Line = Line.rsplit('"').first;
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StringRef Ext = Line.rsplit('.').second;
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if (Ext.equals_lower("h") || Ext.equals_lower("c")) {
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Outputting = false;
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} else {
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Outputting = true;
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}
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return false;
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}
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bool Filter::streamEof() const { return Pos == DataLength; }
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} // anonymous namespace
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namespace llvm {
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std::string filterCppOutput(StringRef Input) { return Filter(Input).run(); }
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} // namespace llvm
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