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1 /* |
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2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * |
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16 */ |
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17 #ifndef COREPARSER_H |
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18 #define COREPARSER_H |
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19 |
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20 #include <string> |
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21 #include <vector> |
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22 #include <deque> |
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23 |
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24 class Parser; |
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25 |
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26 class ParseResult |
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27 { |
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28 public: |
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29 ParseResult(); |
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30 static ParseResult Fail(); |
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31 |
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32 bool Matched() const; |
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33 |
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34 public: |
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35 int iRuleId; |
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36 int iStart; |
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37 int iEnd; |
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38 std::deque<ParseResult> iChildren; |
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39 }; |
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40 |
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41 |
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42 class Parser |
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43 { |
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44 public: |
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45 Parser(const char* aMatch); |
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46 static Parser EOS(); |
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47 static Parser Int(); |
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48 static Parser Real(); |
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49 static const Parser& Nul(); |
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50 |
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51 ParseResult Parse(const std::string& aString) const; |
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52 |
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53 int Id() const; |
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54 void SetId(int aId); |
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55 |
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56 Parser(); |
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57 Parser(const Parser& aOther); |
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58 ~Parser(); |
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59 const Parser& operator=(const Parser& aOther); |
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60 |
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61 private: |
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62 friend Parser operator|(const Parser& aFirst, const Parser& aRest); |
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63 friend Parser operator>>(const Parser& aFirst, const Parser& aRest); |
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64 friend Parser operator*(const Parser& aSub); |
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65 |
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66 enum T0Op |
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67 { |
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68 EExact, |
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69 EEos, |
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70 EInt, |
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71 EReal, |
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72 ENul, |
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73 ELast0 |
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74 }; |
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75 enum T1Op |
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76 { |
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77 EMult = ELast0, |
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78 ELast1 |
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79 }; |
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80 enum T2Op |
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81 { |
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82 ESeq = ELast1, |
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83 EAlt |
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84 }; |
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85 |
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86 Parser(T0Op aOp); |
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87 Parser(T1Op aOp, const Parser& aSub); |
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88 Parser(T2Op aOp, const Parser& aFirst, const Parser& aRest); |
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89 |
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90 struct Step |
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91 { |
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92 Step(const Parser* aRule, int aPos, int aParent) |
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93 : iRule(aRule), iStep(0), iPos(aPos), iParent(aParent) |
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94 { |
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95 iResult.iStart = aPos; |
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96 } |
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97 const Parser* iRule; |
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98 int iStep; |
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99 ParseResult iResult; |
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100 int iPos; |
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101 int iParent; |
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102 }; |
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103 |
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104 enum TMatchRes |
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105 { |
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106 EFail, |
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107 EPass, |
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108 EContinue |
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109 }; |
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110 |
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111 TMatchRes ParseStep(int aStep, const std::string& aString, int aPos, std::vector<Step>& aStack) const; |
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112 |
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113 private: |
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114 int iOp; |
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115 const char* iMatch; |
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116 const Parser* iSub1; |
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117 const Parser* iSub2; |
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118 int iId; |
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119 }; |
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120 |
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121 Parser operator|(const Parser& aFirst, const Parser& aRest); |
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122 Parser operator>>(const Parser& aFirst, const Parser& aRest); |
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123 //Parser operator*(const Parser& aSub); |
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124 |
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125 #endif |