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1 /* |
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2 * Copyright (c) 2003 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 the License "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: CSS Lexer |
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15 * |
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16 */ |
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17 |
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18 |
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19 #ifndef TCSSReader_H |
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20 #define TCSSReader_H |
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21 |
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22 // INCLUDES |
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23 #include "nwx_defs.h" |
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24 #include "nw_string_string.h" |
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25 #include <e32std.h> |
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26 |
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27 // CONSTANTS |
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28 |
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29 // MACROS |
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30 |
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31 // DATA TYPES |
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32 |
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33 enum TCSSReaderTokenType{ |
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34 SPACE = 1, |
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35 ATKEYWORD, |
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36 HASH, |
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37 ASTERISK, |
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38 COMMA, |
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39 DOT, |
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40 COLON, |
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41 HYPHEN, |
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42 SEMI_COLON, |
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43 LEFT_BRACE, |
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44 RIGHT_BRACE, |
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45 LEFT_BRACKET, |
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46 RIGHT_BRACKET, |
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47 EQUALS, |
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48 CHARSET_RULE, |
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49 IMPORT_RULE, |
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50 MEDIA_RULE, |
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51 LINK_PSEUDO_CLASS, |
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52 VISITED_PSEUDO_CLASS, |
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53 FOCUS_PSEUDO_CLASS, |
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54 ACTIVE_PSEUDO_CLASS, |
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55 CACHED_PSEUDO_CLASS, |
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56 IMPORTANT, |
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57 VERTICAL_LINE, |
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58 CDO, |
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59 CDC, |
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60 BUFFER_END, |
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61 IDENTIFIER, |
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62 EMS, |
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63 EXS, |
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64 PXS, |
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65 INS, |
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66 CMS, |
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67 MMS, |
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68 PTS, |
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69 PERCENTAGE, |
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70 PCS, |
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71 NUMBER, |
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72 URI, |
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73 RGB, |
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74 STRING, |
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75 RIGHT_PARENTHESIS, |
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76 DIGIT, |
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77 ALPHA, |
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78 INVALID |
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79 }; |
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80 |
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81 // FUNCTION PROTOTYPES |
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82 |
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83 // FORWARD DECLARATIONS |
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84 |
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85 // CLASS DECLARATION |
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86 |
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87 /** |
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88 * This class is a unit of text |
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89 * @lib css.lib |
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90 * @since 2.1 |
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91 */ |
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92 class TCSSReaderUnit |
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93 { |
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94 public: |
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95 // constructor |
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96 TCSSReaderUnit(TText8* aStorage, TUint32 aLength, TUint32 aNumChars) |
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97 { |
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98 iStorage = aStorage; |
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99 iLength = aLength; |
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100 iNumChars = aNumChars; |
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101 } |
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102 |
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103 TCSSReaderUnit() |
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104 { |
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105 iStorage = NULL; |
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106 iLength = 0; |
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107 iNumChars = 0; |
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108 } |
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109 |
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110 void Init(TText8* aStorage, TUint32 aLength, TUint32 aNumChars) |
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111 { |
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112 iStorage = aStorage; |
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113 iLength = aLength; |
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114 iNumChars = aNumChars; |
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115 } |
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116 /** |
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117 * Converts the text to unicode |
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118 * @since 2.1 |
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119 * @param aEncoding: encoding of the document being parsed |
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120 * return unicode String |
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121 */ |
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122 TText16* GetUnicodeL(TUint32 aEncoding); |
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123 TText16* GetUnicode(TUint32 aEncoding); |
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124 |
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125 public: //data |
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126 // pointer to beginning of text |
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127 TText8* iStorage; |
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128 // length of storage |
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129 TUint32 iLength; |
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130 // number of character |
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131 TUint32 iNumChars; |
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132 }; |
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133 // CLASS DECLARATION |
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134 |
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135 /** |
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136 * This class is the lexer for CSS syntax |
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137 * @lib css.lib |
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138 * @since 2.1 |
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139 */ |
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140 class TCSSReader |
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141 { |
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142 public: |
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143 // constructor |
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144 TCSSReader(TText8* aBuffer, TUint32 aLength, TUint32 aEncoding) |
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145 { |
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146 iBuffer = aBuffer; |
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147 iLength = aLength; |
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148 iEncoding = aEncoding; |
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149 iPosition = 0; |
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150 } |
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151 |
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152 TCSSReader() |
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153 { |
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154 iBuffer = NULL; |
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155 iLength = 0; |
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156 iEncoding = 0; |
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157 iPosition = 0; |
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158 } |
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159 |
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160 void Init(TText8* aBuffer, TUint32 aLength, TUint32 aEncoding) |
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161 { |
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162 iBuffer = aBuffer; |
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163 iLength = aLength; |
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164 iEncoding = aEncoding; |
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165 iPosition = 0; |
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166 } |
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167 |
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168 /** |
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169 * Skips white space as defined by CSS2 Spec |
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170 * @since 2.1 |
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171 * return void |
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172 */ |
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173 void SkipWhiteSpaces(); |
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174 |
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175 /** |
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176 * Finds if the media type is valid (all or handheld) |
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177 * @since 2.1 |
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178 * @param aMedia: media to be evaluated |
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179 * return ETrue if media is valid else EFalse |
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180 */ |
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181 TBool IsValidMedia(TCSSReaderUnit* aMedia); |
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182 |
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183 TInt8 ReadNextToken(TCSSReaderUnit* aStr); |
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184 |
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185 TInt8 GetPseudoClass(); |
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186 |
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187 TInt8 ReadNumberToken(TCSSReaderUnit* aStr); |
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188 |
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189 TBool ReadIdentifier(TCSSReaderUnit* aStr); |
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190 |
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191 TBool ReadString(TCSSReaderUnit* aStr); |
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192 |
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193 TBool ReadName(TCSSReaderUnit* aStr); |
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194 |
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195 TBool ReadURI(TCSSReaderUnit* aStr); |
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196 |
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197 TBool ReadCharset(); |
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198 |
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199 TBrowserStatusCode GoToToken(TUint8 aTokenType, TText8** aPosition); |
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200 |
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201 /** |
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202 * Ignores the At-rule of CSS starting at given position |
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203 * @since 2.1 |
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204 * @param aPosition - starting of At-Rule |
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205 * return void |
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206 */ |
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207 TBool IgnoreAtRule(TUint32 aPosition); |
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208 |
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209 /** |
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210 * Sets position of the reader |
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211 * @since 2.1 |
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212 * @param aPosition - position of reader |
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213 * return void |
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214 */ |
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215 inline void SetPosition(TUint32 aPosition){iPosition = aPosition;} |
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216 |
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217 /** |
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218 * Returns pointer to the buffer |
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219 * @since 2.1 |
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220 * return pointer to the buffer |
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221 */ |
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222 inline TText8* GetBuffer(){return iBuffer;} |
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223 |
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224 /** |
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225 * Returns length of buffer |
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226 * @since 2.1 |
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227 * return length of buffer |
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228 */ |
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229 inline TUint32 GetLength(){return iLength;} |
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230 |
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231 /** |
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232 * Returns current position of reader |
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233 * @since 2.1 |
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234 * return current position of reader |
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235 */ |
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236 inline TUint32 GetPosition(){return iPosition;} |
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237 |
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238 /** |
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239 * Returns encoding of buffer |
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240 * @since 2.1 |
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241 * return encoding of buffer |
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242 */ |
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243 inline TUint32 GetEncoding(){return iEncoding;} |
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244 |
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245 /** |
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246 * Advances the buffer by certain number of bytes |
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247 * @since 2.1 |
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248 * @param aNumBytes - number of bytes to advance |
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249 * return void |
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250 */ |
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251 TBool Advance(TUint32 aNumBytes); |
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252 |
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253 /** |
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254 * Sets encoding of the document |
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255 * @since 2.1 |
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256 * @param aEncoding - encoding of buffer |
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257 * return void |
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258 */ |
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259 inline void SetEncoding(TUint32 aEncoding){iEncoding = aEncoding;} |
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260 |
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261 /** |
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262 * Returns pointer to the buffer storage where reader is positioned |
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263 * @since 2.1 |
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264 * return pointer to the buffer storage where reader is positioned |
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265 */ |
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266 inline TText8* GetBufferPointer(){return (iBuffer+iPosition);} |
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267 |
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268 /** |
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269 * Gets the encoding associated with the text |
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270 * @since 2.1 |
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271 * return encoding of the document being parsed |
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272 */ |
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273 TUint32 GetCharsetVal(); |
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274 |
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275 /** |
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276 * Reads a character |
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277 * @since 2.1 |
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278 * return encoding of the document being parsed |
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279 */ |
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280 TInt32 ReadChar(TText16* aChar); |
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281 |
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282 TUint16 ReadEscape(TText16* aOutChar); |
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283 |
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284 private: // Functions |
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285 |
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286 TBool Equals(const TText16* aStr, TBool aCaseInsensitive); |
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287 |
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288 TBool ReadBlock(TText16 aClosingChar); |
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289 |
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290 private: // Data |
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291 |
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292 // pointer to the CSS buffer |
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293 TText8* iBuffer; |
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294 // length of buffer |
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295 TUint32 iLength; |
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296 // encoding of buffer |
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297 TUint32 iEncoding; |
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298 // position in the buffer |
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299 TUint32 iPosition; |
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300 }; |
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301 |
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302 #endif /* TCSSReader_H */ |
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303 |