1 | /* |
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2 | * searchtools.js |
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3 | * ~~~~~~~~~~~~~~ |
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4 | * |
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5 | * Sphinx JavaScript utilties for the full-text search. |
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6 | * |
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7 | * :copyright: Copyright 2007-2010 by the Sphinx team, see AUTHORS. |
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8 | * :license: BSD, see LICENSE for details. |
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9 | * |
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10 | */ |
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11 | |
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12 | /** |
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13 | * helper function to return a node containing the |
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14 | * search summary for a given text. keywords is a list |
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15 | * of stemmed words, hlwords is the list of normal, unstemmed |
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16 | * words. the first one is used to find the occurance, the |
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17 | * latter for highlighting it. |
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18 | */ |
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19 | |
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20 | jQuery.makeSearchSummary = function(text, keywords, hlwords) { |
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21 | var textLower = text.toLowerCase(); |
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22 | var start = 0; |
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23 | $.each(keywords, function() { |
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24 | var i = textLower.indexOf(this.toLowerCase()); |
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25 | if (i > -1) |
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26 | start = i; |
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27 | }); |
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28 | start = Math.max(start - 120, 0); |
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29 | var excerpt = ((start > 0) ? '...' : '') + |
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30 | $.trim(text.substr(start, 240)) + |
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31 | ((start + 240 - text.length) ? '...' : ''); |
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32 | var rv = $('<div class="context"></div>').text(excerpt); |
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33 | $.each(hlwords, function() { |
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34 | rv = rv.highlightText(this, 'highlighted'); |
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35 | }); |
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36 | return rv; |
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37 | } |
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38 | |
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39 | /** |
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40 | * Porter Stemmer |
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41 | */ |
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42 | var PorterStemmer = function() { |
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43 | |
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44 | var step2list = { |
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45 | ational: 'ate', |
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46 | tional: 'tion', |
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47 | enci: 'ence', |
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48 | anci: 'ance', |
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49 | izer: 'ize', |
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50 | bli: 'ble', |
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51 | alli: 'al', |
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52 | entli: 'ent', |
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53 | eli: 'e', |
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54 | ousli: 'ous', |
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55 | ization: 'ize', |
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56 | ation: 'ate', |
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57 | ator: 'ate', |
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58 | alism: 'al', |
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59 | iveness: 'ive', |
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60 | fulness: 'ful', |
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61 | ousness: 'ous', |
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62 | aliti: 'al', |
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63 | iviti: 'ive', |
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64 | biliti: 'ble', |
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65 | logi: 'log' |
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66 | }; |
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67 | |
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68 | var step3list = { |
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69 | icate: 'ic', |
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70 | ative: '', |
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71 | alize: 'al', |
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72 | iciti: 'ic', |
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73 | ical: 'ic', |
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74 | ful: '', |
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75 | ness: '' |
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76 | }; |
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77 | |
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78 | var c = "[^aeiou]"; // consonant |
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79 | var v = "[aeiouy]"; // vowel |
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80 | var C = c + "[^aeiouy]*"; // consonant sequence |
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81 | var V = v + "[aeiou]*"; // vowel sequence |
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82 | |
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83 | var mgr0 = "^(" + C + ")?" + V + C; // [C]VC... is m>0 |
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84 | var meq1 = "^(" + C + ")?" + V + C + "(" + V + ")?$"; // [C]VC[V] is m=1 |
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85 | var mgr1 = "^(" + C + ")?" + V + C + V + C; // [C]VCVC... is m>1 |
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86 | var s_v = "^(" + C + ")?" + v; // vowel in stem |
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87 | |
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88 | this.stemWord = function (w) { |
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89 | var stem; |
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90 | var suffix; |
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91 | var firstch; |
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92 | var origword = w; |
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93 | |
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94 | if (w.length < 3) |
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95 | return w; |
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96 | |
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97 | var re; |
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98 | var re2; |
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99 | var re3; |
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100 | var re4; |
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101 | |
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102 | firstch = w.substr(0,1); |
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103 | if (firstch == "y") |
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104 | w = firstch.toUpperCase() + w.substr(1); |
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105 | |
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106 | // Step 1a |
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107 | re = /^(.+?)(ss|i)es$/; |
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108 | re2 = /^(.+?)([^s])s$/; |
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109 | |
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110 | if (re.test(w)) |
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111 | w = w.replace(re,"$1$2"); |
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112 | else if (re2.test(w)) |
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113 | w = w.replace(re2,"$1$2"); |
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114 | |
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115 | // Step 1b |
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116 | re = /^(.+?)eed$/; |
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117 | re2 = /^(.+?)(ed|ing)$/; |
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118 | if (re.test(w)) { |
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119 | var fp = re.exec(w); |
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120 | re = new RegExp(mgr0); |
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121 | if (re.test(fp[1])) { |
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122 | re = /.$/; |
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123 | w = w.replace(re,""); |
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124 | } |
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125 | } |
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126 | else if (re2.test(w)) { |
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127 | var fp = re2.exec(w); |
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128 | stem = fp[1]; |
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129 | re2 = new RegExp(s_v); |
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130 | if (re2.test(stem)) { |
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131 | w = stem; |
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132 | re2 = /(at|bl|iz)$/; |
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133 | re3 = new RegExp("([^aeiouylsz])\\1$"); |
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134 | re4 = new RegExp("^" + C + v + "[^aeiouwxy]$"); |
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135 | if (re2.test(w)) |
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136 | w = w + "e"; |
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137 | else if (re3.test(w)) { |
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138 | re = /.$/; |
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139 | w = w.replace(re,""); |
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140 | } |
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141 | else if (re4.test(w)) |
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142 | w = w + "e"; |
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143 | } |
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144 | } |
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145 | |
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146 | // Step 1c |
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147 | re = /^(.+?)y$/; |
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148 | if (re.test(w)) { |
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149 | var fp = re.exec(w); |
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150 | stem = fp[1]; |
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151 | re = new RegExp(s_v); |
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152 | if (re.test(stem)) |
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153 | w = stem + "i"; |
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154 | } |
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155 | |
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156 | // Step 2 |
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157 | re = /^(.+?)(ational|tional|enci|anci|izer|bli|alli|entli|eli|ousli|ization|ation|ator|alism|iveness|fulness|ousness|aliti|iviti|biliti|logi)$/; |
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158 | if (re.test(w)) { |
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159 | var fp = re.exec(w); |
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160 | stem = fp[1]; |
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161 | suffix = fp[2]; |
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162 | re = new RegExp(mgr0); |
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163 | if (re.test(stem)) |
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164 | w = stem + step2list[suffix]; |
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165 | } |
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166 | |
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167 | // Step 3 |
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168 | re = /^(.+?)(icate|ative|alize|iciti|ical|ful|ness)$/; |
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169 | if (re.test(w)) { |
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170 | var fp = re.exec(w); |
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171 | stem = fp[1]; |
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172 | suffix = fp[2]; |
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173 | re = new RegExp(mgr0); |
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174 | if (re.test(stem)) |
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175 | w = stem + step3list[suffix]; |
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176 | } |
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177 | |
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178 | // Step 4 |
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179 | re = /^(.+?)(al|ance|ence|er|ic|able|ible|ant|ement|ment|ent|ou|ism|ate|iti|ous|ive|ize)$/; |
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180 | re2 = /^(.+?)(s|t)(ion)$/; |
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181 | if (re.test(w)) { |
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182 | var fp = re.exec(w); |
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183 | stem = fp[1]; |
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184 | re = new RegExp(mgr1); |
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185 | if (re.test(stem)) |
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186 | w = stem; |
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187 | } |
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188 | else if (re2.test(w)) { |
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189 | var fp = re2.exec(w); |
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190 | stem = fp[1] + fp[2]; |
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191 | re2 = new RegExp(mgr1); |
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192 | if (re2.test(stem)) |
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193 | w = stem; |
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194 | } |
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195 | |
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196 | // Step 5 |
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197 | re = /^(.+?)e$/; |
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198 | if (re.test(w)) { |
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199 | var fp = re.exec(w); |
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200 | stem = fp[1]; |
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201 | re = new RegExp(mgr1); |
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202 | re2 = new RegExp(meq1); |
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203 | re3 = new RegExp("^" + C + v + "[^aeiouwxy]$"); |
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204 | if (re.test(stem) || (re2.test(stem) && !(re3.test(stem)))) |
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205 | w = stem; |
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206 | } |
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207 | re = /ll$/; |
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208 | re2 = new RegExp(mgr1); |
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209 | if (re.test(w) && re2.test(w)) { |
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210 | re = /.$/; |
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211 | w = w.replace(re,""); |
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212 | } |
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213 | |
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214 | // and turn initial Y back to y |
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215 | if (firstch == "y") |
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216 | w = firstch.toLowerCase() + w.substr(1); |
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217 | return w; |
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218 | } |
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219 | } |
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220 | |
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221 | |
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222 | /** |
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223 | * Search Module |
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224 | */ |
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225 | var Search = { |
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226 | |
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227 | _index : null, |
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228 | _queued_query : null, |
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229 | _pulse_status : -1, |
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230 | |
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231 | init : function() { |
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232 | var params = $.getQueryParameters(); |
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233 | if (params.q) { |
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234 | var query = params.q[0]; |
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235 | $('input[name="q"]')[0].value = query; |
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236 | this.performSearch(query); |
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237 | } |
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238 | }, |
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239 | |
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240 | /** |
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241 | * Sets the index |
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242 | */ |
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243 | setIndex : function(index) { |
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244 | var q; |
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245 | this._index = index; |
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246 | if ((q = this._queued_query) !== null) { |
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247 | this._queued_query = null; |
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248 | Search.query(q); |
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249 | } |
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250 | }, |
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251 | |
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252 | hasIndex : function() { |
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253 | return this._index !== null; |
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254 | }, |
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255 | |
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256 | deferQuery : function(query) { |
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257 | this._queued_query = query; |
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258 | }, |
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259 | |
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260 | stopPulse : function() { |
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261 | this._pulse_status = 0; |
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262 | }, |
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263 | |
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264 | startPulse : function() { |
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265 | if (this._pulse_status >= 0) |
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266 | return; |
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267 | function pulse() { |
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268 | Search._pulse_status = (Search._pulse_status + 1) % 4; |
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269 | var dotString = ''; |
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270 | for (var i = 0; i < Search._pulse_status; i++) |
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271 | dotString += '.'; |
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272 | Search.dots.text(dotString); |
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273 | if (Search._pulse_status > -1) |
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274 | window.setTimeout(pulse, 500); |
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275 | }; |
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276 | pulse(); |
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277 | }, |
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278 | |
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279 | /** |
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280 | * perform a search for something |
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281 | */ |
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282 | performSearch : function(query) { |
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283 | // create the required interface elements |
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284 | this.out = $('#search-results'); |
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285 | this.title = $('<h2>' + _('Searching') + '</h2>').appendTo(this.out); |
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286 | this.dots = $('<span></span>').appendTo(this.title); |
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287 | this.status = $('<p style="display: none"></p>').appendTo(this.out); |
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288 | this.output = $('<ul class="search"/>').appendTo(this.out); |
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289 | |
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290 | $('#search-progress').text(_('Preparing search...')); |
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291 | this.startPulse(); |
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292 | |
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293 | // index already loaded, the browser was quick! |
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294 | if (this.hasIndex()) |
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295 | this.query(query); |
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296 | else |
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297 | this.deferQuery(query); |
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298 | }, |
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299 | |
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300 | query : function(query) { |
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301 | var stopwords = ['and', 'then', 'into', 'it', 'as', 'are', 'in', |
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302 | 'if', 'for', 'no', 'there', 'their', 'was', 'is', |
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303 | 'be', 'to', 'that', 'but', 'they', 'not', 'such', |
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304 | 'with', 'by', 'a', 'on', 'these', 'of', 'will', |
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305 | 'this', 'near', 'the', 'or', 'at']; |
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306 | |
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307 | // stem the searchterms and add them to the correct list |
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308 | var stemmer = new PorterStemmer(); |
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309 | var searchterms = []; |
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310 | var excluded = []; |
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311 | var hlterms = []; |
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312 | var tmp = query.split(/\s+/); |
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313 | var object = (tmp.length == 1) ? tmp[0].toLowerCase() : null; |
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314 | for (var i = 0; i < tmp.length; i++) { |
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315 | if ($u.indexOf(stopwords, tmp[i]) != -1 || tmp[i].match(/^\d+$/) || |
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316 | tmp[i] == "") { |
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317 | // skip this "word" |
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318 | continue; |
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319 | } |
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320 | // stem the word |
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321 | var word = stemmer.stemWord(tmp[i]).toLowerCase(); |
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322 | // select the correct list |
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323 | if (word[0] == '-') { |
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324 | var toAppend = excluded; |
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325 | word = word.substr(1); |
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326 | } |
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327 | else { |
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328 | var toAppend = searchterms; |
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329 | hlterms.push(tmp[i].toLowerCase()); |
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330 | } |
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331 | // only add if not already in the list |
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332 | if (!$.contains(toAppend, word)) |
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333 | toAppend.push(word); |
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334 | }; |
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335 | var highlightstring = '?highlight=' + $.urlencode(hlterms.join(" ")); |
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336 | |
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337 | // console.debug('SEARCH: searching for:'); |
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338 | // console.info('required: ', searchterms); |
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339 | // console.info('excluded: ', excluded); |
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340 | |
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341 | // prepare search |
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342 | var filenames = this._index.filenames; |
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343 | var titles = this._index.titles; |
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344 | var terms = this._index.terms; |
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345 | var objects = this._index.objects; |
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346 | var objtypes = this._index.objtypes; |
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347 | var objnames = this._index.objnames; |
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348 | var fileMap = {}; |
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349 | var files = null; |
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350 | // different result priorities |
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351 | var importantResults = []; |
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352 | var objectResults = []; |
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353 | var regularResults = []; |
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354 | var unimportantResults = []; |
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355 | $('#search-progress').empty(); |
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356 | |
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357 | // lookup as object |
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358 | if (object != null) { |
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359 | for (var prefix in objects) { |
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360 | for (var name in objects[prefix]) { |
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361 | var fullname = (prefix ? prefix + '.' : '') + name; |
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362 | if (fullname.toLowerCase().indexOf(object) > -1) { |
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363 | match = objects[prefix][name]; |
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364 | descr = objnames[match[1]] + _(', in ') + titles[match[0]]; |
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365 | // XXX the generated anchors are not generally correct |
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366 | // XXX there may be custom prefixes |
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367 | result = [filenames[match[0]], fullname, '#'+fullname, descr]; |
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368 | switch (match[2]) { |
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369 | case 1: objectResults.push(result); break; |
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370 | case 0: importantResults.push(result); break; |
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371 | case 2: unimportantResults.push(result); break; |
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372 | } |
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373 | } |
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374 | } |
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375 | } |
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376 | } |
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377 | |
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378 | // sort results descending |
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379 | objectResults.sort(function(a, b) { |
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380 | return (a[1] > b[1]) ? -1 : ((a[1] < b[1]) ? 1 : 0); |
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381 | }); |
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382 | |
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383 | importantResults.sort(function(a, b) { |
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384 | return (a[1] > b[1]) ? -1 : ((a[1] < b[1]) ? 1 : 0); |
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385 | }); |
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386 | |
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387 | unimportantResults.sort(function(a, b) { |
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388 | return (a[1] > b[1]) ? -1 : ((a[1] < b[1]) ? 1 : 0); |
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389 | }); |
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390 | |
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391 | |
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392 | // perform the search on the required terms |
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393 | for (var i = 0; i < searchterms.length; i++) { |
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394 | var word = searchterms[i]; |
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395 | // no match but word was a required one |
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396 | if ((files = terms[word]) == null) |
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397 | break; |
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398 | if (files.length == undefined) { |
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399 | files = [files]; |
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400 | } |
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401 | // create the mapping |
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402 | for (var j = 0; j < files.length; j++) { |
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403 | var file = files[j]; |
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404 | if (file in fileMap) |
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405 | fileMap[file].push(word); |
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406 | else |
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407 | fileMap[file] = [word]; |
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408 | } |
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409 | } |
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410 | |
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411 | // now check if the files don't contain excluded terms |
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412 | for (var file in fileMap) { |
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413 | var valid = true; |
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414 | |
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415 | // check if all requirements are matched |
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416 | if (fileMap[file].length != searchterms.length) |
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417 | continue; |
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418 | |
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419 | // ensure that none of the excluded terms is in the |
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420 | // search result. |
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421 | for (var i = 0; i < excluded.length; i++) { |
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422 | if (terms[excluded[i]] == file || |
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423 | $.contains(terms[excluded[i]] || [], file)) { |
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424 | valid = false; |
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425 | break; |
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426 | } |
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427 | } |
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428 | |
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429 | // if we have still a valid result we can add it |
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430 | // to the result list |
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431 | if (valid) |
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432 | regularResults.push([filenames[file], titles[file], '', null]); |
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433 | } |
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434 | |
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435 | // delete unused variables in order to not waste |
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436 | // memory until list is retrieved completely |
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437 | delete filenames, titles, terms; |
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438 | |
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439 | // now sort the regular results descending by title |
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440 | regularResults.sort(function(a, b) { |
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441 | var left = a[1].toLowerCase(); |
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442 | var right = b[1].toLowerCase(); |
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443 | return (left > right) ? -1 : ((left < right) ? 1 : 0); |
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444 | }); |
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445 | |
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446 | // combine all results |
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447 | var results = unimportantResults.concat(regularResults) |
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448 | .concat(objectResults).concat(importantResults); |
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449 | |
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450 | // print the results |
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451 | var resultCount = results.length; |
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452 | function displayNextItem() { |
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453 | // results left, load the summary and display it |
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454 | if (results.length) { |
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455 | var item = results.pop(); |
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456 | var listItem = $('<li style="display:none"></li>'); |
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457 | listItem.append($('<a/>').attr( |
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458 | 'href', |
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459 | item[0] + DOCUMENTATION_OPTIONS.FILE_SUFFIX + |
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460 | highlightstring + item[2]).html(item[1])); |
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461 | if (item[3]) { |
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462 | listItem.append($('<span> (' + item[3] + ')</span>')); |
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463 | Search.output.append(listItem); |
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464 | listItem.slideDown(5, function() { |
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465 | displayNextItem(); |
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466 | }); |
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467 | } else if (DOCUMENTATION_OPTIONS.HAS_SOURCE) { |
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468 | $.get(DOCUMENTATION_OPTIONS.URL_ROOT + '_sources/' + |
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469 | item[0] + '.txt', function(data) { |
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470 | if (data != '') { |
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471 | listItem.append($.makeSearchSummary(data, searchterms, hlterms)); |
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472 | Search.output.append(listItem); |
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473 | listItem.slideDown(5, function() { |
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474 | displayNextItem(); |
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475 | }); |
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476 | } |
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477 | }); |
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478 | } else { |
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479 | // no source available, just display title |
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480 | Search.output.append(listItem); |
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481 | listItem.slideDown(5, function() { |
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482 | displayNextItem(); |
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483 | }); |
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484 | } |
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485 | } |
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486 | // search finished, update title and status message |
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487 | else { |
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488 | Search.stopPulse(); |
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489 | Search.title.text(_('Search Results')); |
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490 | if (!resultCount) |
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491 | Search.status.text(_('Your search did not match any documents. Please make sure that all words are spelled correctly and that you\'ve selected enough categories.')); |
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492 | else |
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493 | Search.status.text(_('Search finished, found %s page(s) matching the search query.').replace('%s', resultCount)); |
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494 | Search.status.fadeIn(500); |
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495 | } |
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496 | } |
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497 | displayNextItem(); |
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498 | } |
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499 | } |
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500 | |
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501 | $(document).ready(function() { |
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502 | Search.init(); |
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503 | }); |
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