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1 //===-- ResourceScriptParser.h ----------------------------------*- C++-*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===---------------------------------------------------------------------===//
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9 //
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10 // This defines the RC scripts parser. It takes a sequence of RC tokens
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11 // and then provides the method to parse the resources one by one.
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12 //
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13 //===---------------------------------------------------------------------===//
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14
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15 #ifndef LLVM_TOOLS_LLVMRC_RESOURCESCRIPTPARSER_H
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16 #define LLVM_TOOLS_LLVMRC_RESOURCESCRIPTPARSER_H
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17
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18 #include "ResourceScriptStmt.h"
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19 #include "ResourceScriptToken.h"
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20
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21 #include "llvm/Support/Compiler.h"
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22 #include "llvm/Support/raw_ostream.h"
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23
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24 #include <system_error>
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25 #include <vector>
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26
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27 namespace llvm {
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28 namespace opt {
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29 class InputArgList;
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30 }
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31 namespace rc {
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32
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33 class RCParser {
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34 public:
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35 using LocIter = std::vector<RCToken>::iterator;
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36 using ParseType = Expected<std::unique_ptr<RCResource>>;
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37 using ParseOptionType = Expected<std::unique_ptr<OptionalStmt>>;
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38
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39 // Class describing a single failure of parser.
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40 class ParserError : public ErrorInfo<ParserError> {
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41 public:
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42 ParserError(const Twine &Expected, const LocIter CurLoc, const LocIter End);
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43
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44 void log(raw_ostream &OS) const override { OS << CurMessage; }
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45 std::error_code convertToErrorCode() const override {
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46 return std::make_error_code(std::errc::invalid_argument);
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47 }
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48 const std::string &getMessage() const { return CurMessage; }
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49
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50 static char ID; // Keep llvm::Error happy.
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51
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52 private:
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53 std::string CurMessage;
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54 LocIter ErrorLoc, FileEnd;
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55 };
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56
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57 explicit RCParser(std::vector<RCToken> TokenList);
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58
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59 // Reads and returns a single resource definition, or error message if any
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60 // occurred.
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61 ParseType parseSingleResource();
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62
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63 bool isEof() const;
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64
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65 private:
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66 using Kind = RCToken::Kind;
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67
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68 // Checks if the current parser state points to the token of type TokenKind.
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69 bool isNextTokenKind(Kind TokenKind) const;
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70
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71 // These methods assume that the parser is not in EOF state.
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72
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73 // Take a look at the current token. Do not fetch it.
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74 const RCToken &look() const;
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75 // Read the current token and advance the state by one token.
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76 const RCToken &read();
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77 // Advance the state by one token, discarding the current token.
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78 void consume();
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79
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80 // The following methods try to read a single token, check if it has the
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81 // correct type and then parse it.
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82 // Each integer can be written as an arithmetic expression producing an
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83 // unsigned 32-bit integer.
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84 Expected<RCInt> readInt(); // Parse an integer.
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85 Expected<StringRef> readString(); // Parse a string.
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86 Expected<StringRef> readIdentifier(); // Parse an identifier.
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87 Expected<IntOrString> readIntOrString(); // Parse an integer or a string.
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88 Expected<IntOrString> readTypeOrName(); // Parse an integer or an identifier.
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89
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90 // Helper integer expression parsing methods.
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91 Expected<RCInt> parseIntExpr1();
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92 Expected<RCInt> parseIntExpr2();
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93
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94 // Advance the state by one, discarding the current token.
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95 // If the discarded token had an incorrect type, fail.
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96 Error consumeType(Kind TokenKind);
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97
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98 // Check the current token type. If it's TokenKind, discard it.
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99 // Return true if the parser consumed this token successfully.
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100 bool consumeOptionalType(Kind TokenKind);
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101
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102 // Read at least MinCount, and at most MaxCount integers separated by
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103 // commas. The parser stops reading after fetching MaxCount integers
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104 // or after an error occurs. Whenever the parser reads a comma, it
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105 // expects an integer to follow.
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106 Expected<SmallVector<RCInt, 8>> readIntsWithCommas(size_t MinCount,
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107 size_t MaxCount);
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108
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109 // Read an unknown number of flags preceded by commas. Each correct flag
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110 // has an entry in FlagDesc array of length NumFlags. In case i-th
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111 // flag (0-based) has been read, the result is OR-ed with FlagValues[i].
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112 // As long as parser has a comma to read, it expects to be fed with
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113 // a correct flag afterwards.
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114 Expected<uint32_t> parseFlags(ArrayRef<StringRef> FlagDesc,
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115 ArrayRef<uint32_t> FlagValues);
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116
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117 // Reads a set of optional statements. These can change the behavior of
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118 // a number of resource types (e.g. STRINGTABLE, MENU or DIALOG) if provided
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119 // before the main block with the contents of the resource.
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120 // Usually, resources use a basic set of optional statements:
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121 // CHARACTERISTICS, LANGUAGE, VERSION
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122 // However, DIALOG and DIALOGEX extend this list by the following items:
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123 // CAPTION, CLASS, EXSTYLE, FONT, MENU, STYLE
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124 // UseExtendedStatements flag (off by default) allows the parser to read
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125 // the additional types of statements.
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126 //
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127 // Ref (to the list of all optional statements):
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128 // msdn.microsoft.com/en-us/library/windows/desktop/aa381002(v=vs.85).aspx
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129 enum class OptStmtType { BasicStmt, DialogStmt, DialogExStmt };
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130
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131 Expected<OptionalStmtList>
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132 parseOptionalStatements(OptStmtType StmtsType = OptStmtType::BasicStmt);
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133
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134 // Read a single optional statement.
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135 Expected<std::unique_ptr<OptionalStmt>>
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136 parseSingleOptionalStatement(OptStmtType StmtsType = OptStmtType::BasicStmt);
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137
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138 // Top-level resource parsers.
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139 ParseType parseLanguageResource();
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140 ParseType parseAcceleratorsResource();
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141 ParseType parseCursorResource();
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142 ParseType parseDialogResource(bool IsExtended);
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143 ParseType parseIconResource();
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144 ParseType parseHTMLResource();
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145 ParseType parseMenuResource();
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146 ParseType parseStringTableResource();
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147 ParseType parseUserDefinedResource(IntOrString Type);
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148 ParseType parseVersionInfoResource();
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149
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150 // Helper DIALOG parser - a single control.
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151 Expected<Control> parseControl();
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152
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153 // Helper MENU parser.
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154 Expected<MenuDefinitionList> parseMenuItemsList();
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155
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156 // Helper VERSIONINFO parser - read the contents of a single BLOCK statement,
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157 // from BEGIN to END.
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158 Expected<std::unique_ptr<VersionInfoBlock>>
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159 parseVersionInfoBlockContents(StringRef BlockName);
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160 // Helper VERSIONINFO parser - read either VALUE or BLOCK statement.
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161 Expected<std::unique_ptr<VersionInfoStmt>> parseVersionInfoStmt();
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162 // Helper VERSIONINFO parser - read fixed VERSIONINFO statements.
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163 Expected<VersionInfoResource::VersionInfoFixed> parseVersionInfoFixed();
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164
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165 // Optional statement parsers.
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166 ParseOptionType parseLanguageStmt();
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167 ParseOptionType parseCharacteristicsStmt();
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168 ParseOptionType parseVersionStmt();
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169 ParseOptionType parseCaptionStmt();
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170 ParseOptionType parseFontStmt(OptStmtType DialogType);
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171 ParseOptionType parseStyleStmt();
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172
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173 // Raises an error. If IsAlreadyRead = false (default), this complains about
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174 // the token that couldn't be parsed. If the flag is on, this complains about
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175 // the correctly read token that makes no sense (that is, the current parser
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176 // state is beyond the erroneous token.)
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177 Error getExpectedError(const Twine &Message, bool IsAlreadyRead = false);
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178
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179 std::vector<RCToken> Tokens;
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180 LocIter CurLoc;
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181 const LocIter End;
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182 };
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183
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184 } // namespace rc
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185 } // namespace llvm
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186
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187 #endif
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