1 | /**********************************************************************
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2 | *
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3 | * cstrquerytools.cpp --
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4 | * Copyright (C) 1999 The New Zealand Digital Library Project
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5 | *
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6 | * A component of the Greenstone digital library software
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7 | * from the New Zealand Digital Library Project at the
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8 | * University of Waikato, New Zealand.
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9 | *
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10 | * This program is free software; you can redistribute it and/or modify
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11 | * it under the terms of the GNU General Public License as published by
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12 | * the Free Software Foundation; either version 2 of the License, or
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13 | * (at your option) any later version.
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14 | *
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15 | * This program is distributed in the hope that it will be useful,
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16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 | * GNU General Public License for more details.
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19 | *
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20 | * You should have received a copy of the GNU General Public License
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21 | * along with this program; if not, write to the Free Software
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22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23 | *
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24 | * $Id: cstrquerytools.cpp 891 2000-02-01 22:32:36Z sjboddie $
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25 | *
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26 | *********************************************************************/
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27 |
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28 | /*
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29 | $Log$
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30 | Revision 1.1 2000/02/01 22:32:37 sjboddie
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31 | Initial revision
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32 |
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33 | Revision 1.1 1999/09/07 21:49:44 sjboddie
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34 | new cstr receptionist
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35 |
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36 |
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37 | */
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38 |
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39 |
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40 | // this is overridden for cstr as we're always going to get
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41 | // maxdocs matches. They can then be sorted in the
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42 | // cstrqueryaction
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43 |
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44 | #include "cstrquerytools.h"
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45 |
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46 |
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47 | // do_query sets the filter options and makes the protocol call to
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48 | // do a query. The results are returned in response.
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49 | // request.filterResultOptions and request.fields (if required)
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50 | // should be set by the calling function.
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51 |
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52 | bool do_query (FilterRequest_t &request, cgiargsclass &args,
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53 | recptproto *collectproto, FilterResponse_t &response,
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54 | ostream &logout) {
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55 |
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56 | request.filterName = "QueryFilter";
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57 |
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58 | comerror_t err;
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59 | OptionValue_t option;
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60 | text_t formattedstring = args["q"];
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61 | format_querystring (formattedstring, args.getintarg("b"));
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62 |
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63 | option.name = "Term";
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64 | option.value = formattedstring;
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65 | request.filterOptions.push_back (option);
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66 |
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67 | option.name = "QueryType";
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68 | option.value = (args.getintarg("t")) ? "ranked" : "boolean";
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69 | request.filterOptions.push_back (option);
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70 |
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71 | option.name = "Casefold";
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72 | option.value = (args.getintarg("k")) ? "true" : "false";
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73 | request.filterOptions.push_back (option);
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74 |
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75 | option.name = "Stem";
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76 | option.value = (args.getintarg("s")) ? "true" : "false";
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77 | request.filterOptions.push_back (option);
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78 |
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79 | if (!args["h"].empty()) {
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80 | option.name = "Index";
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81 | option.value = args["h"];
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82 | request.filterOptions.push_back (option);
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83 | }
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84 |
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85 | if (!args["j"].empty()) {
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86 | option.name = "Subcollection";
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87 | option.value = args["j"];
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88 | request.filterOptions.push_back (option);
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89 | }
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90 |
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91 | if (!args["n"].empty()) {
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92 | option.name = "Language";
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93 | option.value = args["n"];
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94 | request.filterOptions.push_back (option);
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95 | }
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96 |
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97 | // fill in the second query if needed
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98 | if (!args["cq2"].empty()) {
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99 | option.name = "CombineQuery";
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100 | option.value = args["cq2"];
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101 | request.filterOptions.push_back (option);
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102 |
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103 | text_t formattedstring2 = args["q2"];
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104 | format_querystring (formattedstring2, args.getintarg("b"));
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105 |
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106 | option.name = "Term";
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107 | option.value = formattedstring2;
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108 | request.filterOptions.push_back (option);
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109 |
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110 | option.name = "QueryType";
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111 | option.value = (args.getintarg("t")) ? "ranked" : "boolean";
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112 | request.filterOptions.push_back (option);
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113 |
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114 | option.name = "Casefold";
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115 | option.value = (args.getintarg("k")) ? "true" : "false";
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116 | request.filterOptions.push_back (option);
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117 |
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118 | option.name = "Stem";
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119 | option.value = (args.getintarg("s")) ? "true" : "false";
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120 | request.filterOptions.push_back (option);
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121 |
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122 | if (!args["h2"].empty()) {
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123 | option.name = "Index";
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124 | option.value = args["h2"];
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125 | request.filterOptions.push_back (option);
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126 | }
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127 |
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128 | if (!args["j2"].empty()) {
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129 | option.name = "Subcollection";
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130 | option.value = args["j2"];
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131 | request.filterOptions.push_back (option);
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132 | }
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133 |
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134 | if (!args["n2"].empty()) {
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135 | option.name = "Language";
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136 | option.value = args["n2"];
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137 | request.filterOptions.push_back (option);
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138 | }
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139 | }
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140 |
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141 | // we always want to retrieve all documents (i.e. 1 to maxdocs)
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142 | // for this collection
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143 | option.name = "Maxdocs";
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144 | option.value = args["m"];
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145 | request.filterOptions.push_back (option);
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146 |
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147 | option.name = "StartResults";
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148 | option.value = 1;
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149 | request.filterOptions.push_back (option);
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150 |
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151 | option.name = "EndResults";
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152 | option.value = args["m"];
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153 | request.filterOptions.push_back (option);
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154 |
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155 | collectproto->filter (args["c"], request, response, err, logout);
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156 |
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157 | if (err != noError) {
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158 | outconvertclass text_t2ascii;
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159 | logout << text_t2ascii
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160 | << "Error: call to QueryFilter failed in queryaction ("
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161 | << get_comerror_string (err) << ")\n";
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162 | return false;
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163 | }
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164 | return true;
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165 | }
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166 |
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167 | void format_querystring (text_t &querystring, int querymode) {
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168 | text_t formattedstring;
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169 |
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170 | text_t::const_iterator here = querystring.begin();
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171 | text_t::const_iterator end = querystring.end();
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172 |
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173 | // space is used to insert spaces between Chinese
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174 | // characters. No space is needed before the first
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175 | // Chinese character.
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176 | bool space = false;
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177 |
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178 | // want to remove ()|!& from querystring so boolean queries are just
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179 | // "all the words" queries (unless querymode is advanced)
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180 | while (here != end) {
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181 | if ((querymode == 0) && (*here == '(' || *here == ')' || *here == '|' ||
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182 | *here == '!' || *here == '&')) {
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183 | formattedstring.push_back(' ');
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184 | } else {
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185 | if ((*here >= 0x4e00 && *here <= 0x9fa5) ||
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186 | (*here >= 0xf900 && *here <= 0xfa2d)) {
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187 | // Chinese character
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188 | if (space) formattedstring.push_back (0x200b);
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189 | formattedstring.push_back (*here);
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190 | formattedstring.push_back (0x200b);
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191 | space = true;
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192 | } else {
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193 | // non-Chinese character
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194 | formattedstring.push_back (*here);
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195 | space = false;
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196 | }
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197 | }
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198 | here ++;
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199 | }
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200 | querystring = formattedstring;
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201 | }
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202 |
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203 | void get_phrases (const text_t &querystring, text_tarray &phrases) {
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204 |
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205 | phrases.erase (phrases.begin(), phrases.end());
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206 | if (!querystring.empty()) {
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207 |
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208 | text_t::const_iterator end = querystring.end();
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209 | text_t::const_iterator here = findchar (querystring.begin(), end, '"');
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210 | if (here != end) {
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211 | text_t tmptext;
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212 | bool foundquote = false;
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213 | while (here != end) {
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214 | if (*here == '"') {
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215 | if (foundquote) {
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216 | if (!tmptext.empty()) {
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217 | phrases.push_back(tmptext);
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218 | tmptext.clear();
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219 | }
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220 | foundquote = false;
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221 | } else foundquote = true;
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222 | } else {
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223 | if (foundquote) tmptext.push_back (*here);
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224 | }
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225 | here ++;
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226 | }
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227 | }
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228 | }
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229 | }
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230 |
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