1 | /**************************************************************************
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2 | *
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3 | * TextEl.cpp -- Data structures for parsed documents
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4 | * Copyright (C) 1999 Rodger McNab
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5 | *
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6 | * This program is free software; you can redistribute it and/or modify
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7 | * it under the terms of the GNU General Public License as published by
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8 | * the Free Software Foundation; either version 2 of the License, or
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9 | * (at your option) any later version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | * GNU General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU General Public License
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17 | * along with this program; if not, write to the Free Software
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18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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19 | *
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20 | **************************************************************************/
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21 |
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22 | #include "TextEl.h"
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23 | #include "ctype.h"
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24 |
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25 | #define REC_TERM '\002'
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26 | #define PARA_TERM '\003'
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27 |
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28 |
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29 | void TextEl::Clear () {
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30 | elType = TextE;
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31 | tagName.erase (tagName.begin(), tagName.end());
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32 | text.erase (text.begin(), text.end());
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33 | }
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34 |
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35 |
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36 | static bool ReadTextTag (FileBuf &buf, TextEl &el) {
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37 | // we must have some sort of tag
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38 | unsigned char c;
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39 | if (!buf.Peek(c)) return false;
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40 |
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41 | // get the '<'
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42 | if (c != '<') return false;
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43 | el.text.push_back (c);
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44 | if (!buf.Next() || !buf.Peek (c)) return false;
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45 |
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46 | // see if we have a '/'
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47 | if (c == '/') {
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48 | // we have a closing tag
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49 | el.text.push_back (c);
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50 | if (!buf.Next() || !buf.Peek (c)) return false;
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51 | el.elType = CloseTagE;
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52 | } else {
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53 | // we have an opening tag
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54 | el.elType = OpenTagE;
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55 | }
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56 |
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57 | // get the tag name
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58 | while (isalnum(c)) {
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59 | el.text.push_back (c);
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60 | el.tagName.push_back (c);
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61 | if (!buf.Next() || !buf.Peek (c)) return false;
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62 | }
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63 |
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64 | // get everything up to the closing '>'
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65 | while (c != '>') {
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66 | el.text.push_back (c);
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67 | if (!buf.Next() || !buf.Peek (c)) return false;
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68 | }
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69 |
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70 | // get the closing '>'
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71 | el.text.push_back (c);
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72 | buf.Next();
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73 |
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74 | // if there is no tag name then make this a text element
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75 | if (el.tagName.empty()) el.elType = TextE;
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76 |
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77 | return true;
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78 | }
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79 |
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80 | static void ToggleParaTag (TextEl &el, bool &compatInPara) {
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81 | SetCStr (el.tagName, "Paragraph");
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82 | el.text.erase (el.text.begin(), el.text.end());
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83 | if (compatInPara) {
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84 | el.elType = CloseTagE;
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85 | el.text.push_back (PARA_TERM);
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86 | } else el.elType = OpenTagE;
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87 | compatInPara = !compatInPara;
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88 | }
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89 |
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90 | static void SetRecTag (TextEl &el, TextElType elType) {
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91 | el.elType = elType;
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92 | SetCStr (el.tagName, "Document");
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93 | el.text.erase (el.text.begin(), el.text.end());
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94 | if (elType == CloseTagE)
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95 | el.text.push_back (REC_TERM);
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96 | }
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97 |
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98 |
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99 | bool ReadTextEl (FileBuf &buf, TextEl &el,
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100 | bool compatMode, bool &compatInPara) {
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101 | el.Clear();
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102 |
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103 | unsigned char c;
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104 | if (!buf.Peek (c)) return false;
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105 |
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106 | if (compatMode) {
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107 | if (c == PARA_TERM) {
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108 | ToggleParaTag (el, compatInPara);
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109 | if (!compatInPara) buf.Next();
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110 | return true;
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111 | }
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112 | if (c == REC_TERM) {
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113 | if (compatInPara) {
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114 | // need to close this paragraph
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115 | ToggleParaTag (el, compatInPara);
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116 | return true;
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117 | }
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118 | // can close this document
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119 | buf.Next();
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120 | SetRecTag (el, CloseTagE);
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121 | return true;
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122 | }
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123 | if (!compatInPara) {
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124 | // need to open a paragraph
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125 | ToggleParaTag (el, compatInPara);
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126 | return true;
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127 | }
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128 | }
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129 |
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130 | // see if we have some sort of tag
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131 | if (c == '<') return ReadTextTag (buf, el);
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132 |
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133 | // read in a text element
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134 | el.elType = TextE;
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135 | while (c != '<' && !(compatMode && (c == PARA_TERM || c == REC_TERM))) {
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136 | el.text.push_back (c);
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137 | if (!buf.Next() || !buf.Peek (c)) break;
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138 | }
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139 |
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140 | return true;
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141 | }
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142 |
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143 | static void AddTextEl (TextElArray &doc, unsigned long &docLen,
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144 | const TextEl &el) {
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145 | doc.push_back (el);
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146 | docLen += el.text.size();
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147 |
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148 | // cout << "elType: " << el.elType << "\n";
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149 | // cout << "tagName: " << el.tagName << "\n";
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150 | // cout << "text: \"" << el.text << "\"\n\n";
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151 | }
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152 |
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153 |
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154 | bool ReadDoc (FileBuf &buf, const UCArray &docTag,
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155 | TextElArray &doc, unsigned long &docLen,
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156 | bool compatMode) {
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157 | bool compatInPara = false;
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158 | bool foundDocEl = false;
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159 | TextEl el;
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160 |
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161 | doc.erase (doc.begin(), doc.end());
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162 | docLen = 0;
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163 |
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164 | if (compatMode) {
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165 | // add <Document><Paragraph>
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166 | SetRecTag (el, OpenTagE);
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167 | AddTextEl (doc, docLen, el);
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168 | ToggleParaTag (el, compatInPara);
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169 | AddTextEl (doc, docLen, el);
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170 |
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171 | } else {
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172 | // look for an opening docTag
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173 | do {
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174 | if (!ReadTextEl (buf, el, compatMode, compatInPara)) return false;
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175 | } while (el.elType != OpenTagE || el.tagName != docTag);
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176 |
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177 | AddTextEl (doc, docLen, el);
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178 | }
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179 |
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180 |
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181 | // get all elements until the closing docTag
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182 | while (ReadTextEl (buf, el, compatMode, compatInPara)) {
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183 | foundDocEl = true;
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184 | AddTextEl (doc, docLen, el);
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185 | if (el.elType == CloseTagE && el.tagName == docTag)
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186 | return true;
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187 | }
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188 |
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189 |
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190 | if (compatMode) {
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191 | if (!foundDocEl) { // end of text
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192 | doc.erase (doc.begin(), doc.end());
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193 | return false;
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194 | }
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195 |
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196 | // if we got here then the eof was encountered before
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197 | // the closing document tag
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198 | if (compatInPara) {
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199 | // need to close this paragraph
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200 | ToggleParaTag (el, compatInPara);
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201 | AddTextEl (doc, docLen, el);
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202 | }
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203 | // close this document
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204 | SetRecTag (el, CloseTagE);
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205 | AddTextEl (doc, docLen, el);
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206 | }
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207 |
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208 | return true;
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209 | }
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210 |
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211 |
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