forked from OSchip/llvm-project
125 lines
3.6 KiB
C++
125 lines
3.6 KiB
C++
//===--- FormatTokenLexer.h - Format C++ code ----------------*- 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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/// \file
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/// This file contains FormatTokenLexer, which tokenizes a source file
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/// into a token stream suitable for ClangFormat.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_LIB_FORMAT_FORMATTOKENLEXER_H
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#define LLVM_CLANG_LIB_FORMAT_FORMATTOKENLEXER_H
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#include "Encoding.h"
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#include "FormatToken.h"
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#include "clang/Basic/SourceLocation.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Format/Format.h"
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#include "llvm/ADT/MapVector.h"
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#include "llvm/Support/Regex.h"
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#include <stack>
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namespace clang {
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namespace format {
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enum LexerState {
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NORMAL,
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TEMPLATE_STRING,
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TOKEN_STASHED,
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};
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class FormatTokenLexer {
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public:
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FormatTokenLexer(const SourceManager &SourceMgr, FileID ID, unsigned Column,
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const FormatStyle &Style, encoding::Encoding Encoding);
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ArrayRef<FormatToken *> lex();
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const AdditionalKeywords &getKeywords() { return Keywords; }
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private:
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void tryMergePreviousTokens();
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bool tryMergeLessLess();
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bool tryMergeNSStringLiteral();
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bool tryMergeJSPrivateIdentifier();
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bool tryMergeCSharpVerbatimStringLiteral();
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bool tryMergeCSharpKeywordVariables();
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bool tryMergeCSharpNullConditionals();
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bool tryMergeCSharpDoubleQuestion();
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bool tryTransformCSharpForEach();
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bool tryMergeTokens(ArrayRef<tok::TokenKind> Kinds, TokenType NewType);
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// Returns \c true if \p Tok can only be followed by an operand in JavaScript.
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bool precedesOperand(FormatToken *Tok);
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bool canPrecedeRegexLiteral(FormatToken *Prev);
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// Tries to parse a JavaScript Regex literal starting at the current token,
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// if that begins with a slash and is in a location where JavaScript allows
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// regex literals. Changes the current token to a regex literal and updates
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// its text if successful.
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void tryParseJSRegexLiteral();
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// Handles JavaScript template strings.
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//
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// JavaScript template strings use backticks ('`') as delimiters, and allow
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// embedding expressions nested in ${expr-here}. Template strings can be
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// nested recursively, i.e. expressions can contain template strings in turn.
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//
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// The code below parses starting from a backtick, up to a closing backtick or
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// an opening ${. It also maintains a stack of lexing contexts to handle
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// nested template parts by balancing curly braces.
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void handleTemplateStrings();
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void tryParsePythonComment();
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bool tryMerge_TMacro();
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bool tryMergeConflictMarkers();
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FormatToken *getStashedToken();
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FormatToken *getNextToken();
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FormatToken *FormatTok;
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bool IsFirstToken;
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std::stack<LexerState> StateStack;
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unsigned Column;
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unsigned TrailingWhitespace;
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std::unique_ptr<Lexer> Lex;
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const SourceManager &SourceMgr;
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FileID ID;
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const FormatStyle &Style;
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IdentifierTable IdentTable;
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AdditionalKeywords Keywords;
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encoding::Encoding Encoding;
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llvm::SpecificBumpPtrAllocator<FormatToken> Allocator;
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// Index (in 'Tokens') of the last token that starts a new line.
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unsigned FirstInLineIndex;
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SmallVector<FormatToken *, 16> Tokens;
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llvm::SmallMapVector<IdentifierInfo *, TokenType, 8> Macros;
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bool FormattingDisabled;
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llvm::Regex MacroBlockBeginRegex;
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llvm::Regex MacroBlockEndRegex;
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void readRawToken(FormatToken &Tok);
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void resetLexer(unsigned Offset);
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};
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} // namespace format
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} // namespace clang
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#endif
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