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1 // Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // $Header$ |
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15 // This module implements TfrLex collection of static lexical functions. |
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16 // rev: mjdavey, symbian@mjdss.com, July 2002 |
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17 // for: Typhoon (7.0s) & JetStream (8.0) |
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18 // |
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19 // |
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20 |
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21 #include <e32std.h> // |
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22 #include <e32cons.h> |
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23 |
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24 //----------------------------------------------------------------------------- |
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25 // Include Files |
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26 |
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27 #include "TfrLex.h" // this module |
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28 |
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29 //----------------------------------------------------------------------------- |
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30 // Extract (skip over) a term. |
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31 //----------------------------------------------------------------------------- |
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32 |
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33 TInt TfrLex::Val( TLex& aLex, const TDesC& aTerm ) |
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34 { |
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35 TLex term( aTerm ); |
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36 TLexMark mark; |
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37 |
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38 aLex.Mark( mark ); |
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39 while ( !term.Eos() ) |
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40 { |
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41 if ( aLex.Eos() || term.Get() != aLex.Get() ) |
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42 { |
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43 aLex.UnGetToMark( mark ); |
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44 return KErrNotFound; |
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45 } |
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46 } |
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47 return KErrNone; |
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48 } |
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49 |
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50 //----------------------------------------------------------------------------- |
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51 // Extract (check if text begins with) a term. |
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52 |
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53 TBool TfrLex::Val( const TDesC& aText, const TDesC& aTerm ) |
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54 { |
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55 TLex lex( aText ); |
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56 return ( Val( lex, aTerm ) == KErrNone ); |
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57 } |
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58 |
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59 //----------------------------------------------------------------------------- |
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60 // Extract (skip over) a term. Folded comparison. |
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61 |
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62 TInt TfrLex::ValF( TLex& aLex, const TDesC& aTerm ) |
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63 { |
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64 TLex term( aTerm ); |
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65 TLexMark mark; |
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66 |
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67 aLex.Mark( mark ); |
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68 while ( !term.Eos() ) |
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69 { |
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70 if ( aLex.Eos() || User::Fold(term.Get()) != User::Fold(aLex.Get()) ) |
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71 { |
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72 aLex.UnGetToMark( mark ); |
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73 return KErrNotFound; |
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74 } |
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75 } |
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76 return KErrNone; |
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77 } |
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78 |
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79 //----------------------------------------------------------------------------- |
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80 // Extract (check if text begins with) a term. |
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81 |
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82 TBool TfrLex::ValF( const TDesC& aText, const TDesC& aTerm ) |
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83 { |
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84 TLex lex( aText ); |
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85 return ( ValF( lex, aTerm ) == KErrNone ); |
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86 } |
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87 |
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88 //----------------------------------------------------------------------------- |
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89 // Extract (check if text begins with) a term. |
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90 // |
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91 // Skip spaces and get token up to end-of-string, a space char or up to the |
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92 // very character you define. The GetF supports tokens like "*". If a token |
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93 // begins with apostrophe but does not end to one, the function L E A V E S |
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94 // with error KErrArgument. |
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95 |
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96 TPtrC TfrLex::GetL( TLex& aLex, const TChar aChar ) |
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97 { |
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98 // Skip spaces and mark the token's start point. |
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99 aLex.SkipSpace(); |
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100 TLexMark mark; |
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101 |
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102 aLex.Mark(mark); |
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103 |
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104 if (aLex.Peek() == '"' ) |
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105 { |
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106 // Skip the " and do find next " followed by eos, space or aChar. |
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107 aLex.Inc(); |
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108 TChar x; |
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109 while ( x = aLex.Get(), !x.Eos() ) |
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110 { |
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111 if ( x == '"' ) |
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112 { |
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113 // Found a " character - but is it the end of the token? |
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114 x = aLex.Peek(); // peek the next character |
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115 if ( x.Eos() || x.IsSpace() || x == aChar ) |
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116 // End of token: return token. |
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117 return aLex.MarkedToken(mark); |
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118 } |
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119 } |
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120 // Unget and L E A V E because did not find the end " of token. |
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121 aLex.UnGetToMark(mark); |
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122 User::Leave(KErrArgument); |
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123 return aLex.MarkedToken(mark); // never reached (l e a v e). |
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124 } |
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125 else |
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126 { |
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127 // Is not a "*" token: find eos or the next space or the aChar |
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128 // and return the token. |
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129 TChar x; |
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130 while ( x = aLex.Peek(), !x.Eos() && !x.IsSpace() && x != aChar ) |
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131 aLex.Inc(); |
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132 |
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133 return aLex.MarkedToken(mark); |
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134 } |
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135 } |
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136 |
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137 //----------------------------------------------------------------------------- |
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138 // Skip spaces and get token up to end-of-string, a space char or up to the |
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139 // very characters you define. The GetF supports tokens like "*". If token |
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140 // begins with apostrophe but does not end to one, the function L E A V E S |
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141 // with error KErrArgument. |
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142 |
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143 TPtrC TfrLex::GetL( TLex& aLex, const TDesC& aList ) |
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144 { |
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145 // Skip spaces and mark the token's start point. |
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146 aLex.SkipSpace(); |
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147 TLexMark mark; |
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148 aLex.Mark(mark); |
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149 |
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150 if ( aLex.Peek() == '"' ) |
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151 { |
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152 // Skip the " and do find next " followed by eos, space or any char |
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153 // in the aList. |
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154 aLex.Inc(); |
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155 TChar x; |
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156 while ( x = aLex.Get(), !x.Eos() ) |
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157 { |
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158 if ( x == '"' ) |
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159 { |
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160 // Found a " character - but is it the end of the token? |
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161 x = aLex.Peek(); |
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162 if ( x.Eos() || x.IsSpace() || aList.Locate(x) < 0 ) |
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163 // End of token: return token. |
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164 return aLex.MarkedToken(mark); |
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165 } |
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166 } |
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167 // Unget and L E A V E because did not find the end " of token. |
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168 aLex.UnGetToMark(mark); |
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169 User::Leave(KErrArgument); |
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170 return aLex.MarkedToken(mark); // never reached (l e a v e). |
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171 } |
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172 else |
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173 { |
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174 // Is not a "*" token: find eos or the next space or any char |
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175 // in the aList and return the token. |
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176 TChar x; |
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177 while ( x = aLex.Peek(), !x.Eos() && !x.IsSpace() && aList.Locate(x) < 0 ) |
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178 aLex.Inc(); |
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179 |
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180 return aLex.MarkedToken(mark); |
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181 } |
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182 } |
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183 |
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184 //----------------------------------------------------------------------------- |
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185 // Skip spaces and then eat the very character or the very term you define. |
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186 // Return ETrue (was found and swallowed) or EFalse. |
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187 // Skip spaces and eat a particular character. |
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188 // |
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189 |
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190 TBool TfrLex::Eat( TLex& aLex, const TChar aChar ) |
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191 { |
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192 TLexMark unget; |
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193 if ( aChar.IsSpace() ) |
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194 { |
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195 // A space character requires its own logic = go over |
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196 // the other space characters - x gets the next char. |
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197 TChar x; |
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198 aLex.Mark(unget); |
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199 while ( x = aLex.Get(), x.IsSpace() && x != aChar ) |
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200 {}; |
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201 if ( x == aChar ) |
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202 return ETrue; |
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203 } |
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204 else |
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205 { |
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206 // For other, non-space, characters: skip spaces and |
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207 // get the next character x. |
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208 aLex.SkipSpace(); |
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209 aLex.Mark(unget); |
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210 if ( aLex.Get() == aChar ) |
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211 return ETrue; |
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212 } |
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213 |
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214 // The character wasn't there, unget to the start point. |
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215 aLex.UnGetToMark(unget); |
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216 return EFalse; |
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217 } |
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218 |
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219 //----------------------------------------------------------------------------- |
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220 // Skip spaces and eat a term, exact comparison. |
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221 |
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222 TBool TfrLex::Eat( TLex& aLex, const TDesC& aTerm ) |
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223 { |
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224 aLex.SkipSpace(); |
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225 TLexMark unget; |
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226 aLex.Mark(unget); |
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227 if ( Val(aLex,aTerm) == KErrNone ) |
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228 return ETrue; |
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229 aLex.UnGetToMark(unget); |
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230 return EFalse; |
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231 } |
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232 |
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233 //----------------------------------------------------------------------------- |
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234 // Skip spaces and eat a term, folded comparison. |
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235 // |
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236 |
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237 TBool TfrLex::EatF( TLex& aLex, const TDesC& aTerm ) |
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238 { |
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239 aLex.SkipSpace(); |
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240 TLexMark unget; |
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241 aLex.Mark(unget); |
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242 if ( ValF(aLex,aTerm) == KErrNone ) return ETrue; |
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243 aLex.UnGetToMark(unget); |
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244 return EFalse; |
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245 } |
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246 |
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247 //----------------------------------------------------------------------------- |
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248 // Get from first non white space onwards. |
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249 |
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250 TPtrC TfrLex::TrimLeft( const TDesC& aText ) |
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251 { |
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252 TLex lex( aText ); |
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253 lex.SkipSpaceAndMark(); |
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254 return lex.Remainder(); |
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255 } |
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256 |
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257 //----------------------------------------------------------------------------- |
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258 // Get up to the last non white space. |
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259 |
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260 TPtrC TfrLex::TrimRight( const TDesC& aText ) |
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261 { |
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262 TLex lex( aText ); |
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263 TPtrC remainder; |
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264 do |
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265 { |
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266 lex.SkipCharacters(); |
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267 remainder.Set( lex.MarkedToken() ); |
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268 lex.SkipSpace(); |
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269 } while ( !lex.Eos() ); |
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270 |
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271 return remainder; |
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272 } |
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273 |
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274 //----------------------------------------------------------------------------- |
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275 // Get from first non white space onwards and up to last non white space. |
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276 // Is TrimLeft and TrimRight. |
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277 |
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278 TPtrC TfrLex::Trim( const TDesC& aText ) |
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279 { |
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280 return TrimRight( TrimLeft( aText ) ); |
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281 } |
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282 |
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283 //----------------------------------------------------------------------------- |
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284 // Peel = Get text like "*" without the two apostrophes. If not like "*", |
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285 // then returns the text as such as the whole. |
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286 |
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287 TPtrC TfrLex::Peel( const TDesC& aText ) |
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288 { |
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289 TPtrC result; |
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290 TInt length = aText.Length(); |
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291 if ( length >= 2 && (aText[0] == '"' && aText[length-1] == '"') ) |
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292 result.Set( aText.Mid(1,length-2) ); |
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293 else |
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294 result.Set( aText ); |
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295 |
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296 return result; |
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297 } |
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298 |
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299 //----------------------------------------------------------------------------- |
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300 // Trim and then Peel. |
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301 |
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302 TPtrC TfrLex::TrimAndPeel( const TDesC& aText ) |
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303 { |
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304 return Peel(Trim(aText)); |
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305 } |
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306 |
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307 //----------------------------------------------------------------------------- |
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308 // Peel and them Trim. |
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309 |
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310 TPtrC TfrLex::PeelAndTrim( const TDesC& aText ) |
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311 { |
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312 return Trim(Peel(aText)); |
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313 } |
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314 |
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315 //----------------------------------------------------------------------------- |
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316 // End of File |
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317 //----------------------------------------------------------------------------- |