1 //===--- FormatTokenLexer.h - Format C++ code ----------------*- C++ ----*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 /// 9 /// \file 10 /// This file contains FormatTokenLexer, which tokenizes a source file 11 /// into a token stream suitable for ClangFormat. 12 /// 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_CLANG_LIB_FORMAT_FORMATTOKENLEXER_H 16 #define LLVM_CLANG_LIB_FORMAT_FORMATTOKENLEXER_H 17 18 #include "Encoding.h" 19 #include "FormatToken.h" 20 #include "clang/Basic/SourceLocation.h" 21 #include "clang/Basic/SourceManager.h" 22 #include "clang/Format/Format.h" 23 #include "llvm/ADT/MapVector.h" 24 #include "llvm/Support/Regex.h" 25 26 #include <stack> 27 28 namespace clang { 29 namespace format { 30 31 enum LexerState { 32 NORMAL, 33 TEMPLATE_STRING, 34 TOKEN_STASHED, 35 }; 36 37 class FormatTokenLexer { 38 public: 39 FormatTokenLexer(const SourceManager &SourceMgr, FileID ID, unsigned Column, 40 const FormatStyle &Style, encoding::Encoding Encoding); 41 42 ArrayRef<FormatToken *> lex(); 43 44 const AdditionalKeywords &getKeywords() { return Keywords; } 45 46 private: 47 void tryMergePreviousTokens(); 48 49 bool tryMergeLessLess(); 50 bool tryMergeNSStringLiteral(); 51 bool tryMergeJSPrivateIdentifier(); 52 bool tryMergeCSharpVerbatimStringLiteral(); 53 bool tryMergeCSharpKeywordVariables(); 54 bool tryMergeCSharpNullConditionals(); 55 bool tryMergeCSharpDoubleQuestion(); 56 57 bool tryMergeTokens(ArrayRef<tok::TokenKind> Kinds, TokenType NewType); 58 59 // Returns \c true if \p Tok can only be followed by an operand in JavaScript. 60 bool precedesOperand(FormatToken *Tok); 61 62 bool canPrecedeRegexLiteral(FormatToken *Prev); 63 64 // Tries to parse a JavaScript Regex literal starting at the current token, 65 // if that begins with a slash and is in a location where JavaScript allows 66 // regex literals. Changes the current token to a regex literal and updates 67 // its text if successful. 68 void tryParseJSRegexLiteral(); 69 70 // Handles JavaScript template strings. 71 // 72 // JavaScript template strings use backticks ('`') as delimiters, and allow 73 // embedding expressions nested in ${expr-here}. Template strings can be 74 // nested recursively, i.e. expressions can contain template strings in turn. 75 // 76 // The code below parses starting from a backtick, up to a closing backtick or 77 // an opening ${. It also maintains a stack of lexing contexts to handle 78 // nested template parts by balancing curly braces. 79 void handleTemplateStrings(); 80 81 void tryParsePythonComment(); 82 83 bool tryMerge_TMacro(); 84 85 bool tryMergeConflictMarkers(); 86 87 FormatToken *getStashedToken(); 88 89 FormatToken *getNextToken(); 90 91 FormatToken *FormatTok; 92 bool IsFirstToken; 93 std::stack<LexerState> StateStack; 94 unsigned Column; 95 unsigned TrailingWhitespace; 96 std::unique_ptr<Lexer> Lex; 97 const SourceManager &SourceMgr; 98 FileID ID; 99 const FormatStyle &Style; 100 IdentifierTable IdentTable; 101 AdditionalKeywords Keywords; 102 encoding::Encoding Encoding; 103 llvm::SpecificBumpPtrAllocator<FormatToken> Allocator; 104 // Index (in 'Tokens') of the last token that starts a new line. 105 unsigned FirstInLineIndex; 106 SmallVector<FormatToken *, 16> Tokens; 107 108 llvm::SmallMapVector<IdentifierInfo *, TokenType, 8> Macros; 109 110 bool FormattingDisabled; 111 112 llvm::Regex MacroBlockBeginRegex; 113 llvm::Regex MacroBlockEndRegex; 114 115 void readRawToken(FormatToken &Tok); 116 117 void resetLexer(unsigned Offset); 118 }; 119 120 } // namespace format 121 } // namespace clang 122 123 #endif 124