1 | /**********************************************************************
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2 | *
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3 | * display.h -- Context sensitive macro language
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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 | *********************************************************************/
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25 |
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26 |
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27 | #ifndef DISPLAY_H
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28 | #define DISPLAY_H
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29 |
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30 | #include "gsdlconf.h"
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31 | #include "text_t.h"
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32 |
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33 |
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34 | #if defined(GSDL_USE_OBJECTSPACE)
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35 | # include <ospace\std\vector>
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36 | # include <ospace\std\list>
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37 | # include <ospace\std\set>
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38 | # include <ospace\std\map>
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39 | # include <ospace\std\algorithm>
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40 | #elif defined(GSDL_USE_STL_H)
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41 | # include <vector.h>
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42 | # include <list.h>
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43 | # include <set.h>
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44 | # include <map.h>
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45 | # if defined(GSDL_USE_ALGO_H)
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46 | # include <algo.h>
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47 | # else
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48 | # include <algorithm.h>
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49 | # endif
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50 | #else
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51 | # include <vector>
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52 | # include <list>
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53 | # include <set>
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54 | # include <map>
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55 | # include <algorithm>
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56 | #endif
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57 |
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58 | #if defined(GSDL_USE_OBJECTSPACE)
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59 | # include <ospace\std\iostream>
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60 | # include <ospace\std\fstream>
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61 | #elif defined(GSDL_USE_IOS_H)
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62 | # include <iostream.h>
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63 | # include <fstream.h>
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64 |
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65 | #define unistream ifstream
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66 | #else
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67 | # include <iostream>
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68 | # include <fstream>
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69 |
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70 | typedef std::basic_ifstream<unsigned char> unistream;
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71 |
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72 | #endif
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73 |
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74 |
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75 | // use the standard namespace
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76 | #if defined(GSDL_USE_OBJECTSPACE)
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77 | using namespace ospace::std;
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78 | #elif !defined(GSDL_NAMESPACE_BROKEN)
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79 | using namespace std;
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80 | #endif
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81 |
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82 |
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83 |
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84 | // MAXRECURSIONDEPTH is a cutoff to catch
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85 | // cyclic macros (a includes b and b includes a)
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86 | #define MAXRECURSIONDEPTH 30
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87 |
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88 | // class prototypes
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89 | class parammacros_t;
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90 | class currentmacros_t;
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91 |
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92 | // a few supporting types
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93 | // fileelement isn't finished yet, I have to find out
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94 | // more about getting information about files
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95 | struct fileinfoelement
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96 | {
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97 | int otherinfo;
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98 | };
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99 |
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100 | // macro value structure
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101 | struct mvalue
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102 | {
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103 | text_t filename;
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104 | text_t value;
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105 | };
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106 |
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107 | inline bool operator==(const fileinfoelement &x, const fileinfoelement &y) {
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108 | return (x.otherinfo==y.otherinfo);
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109 | }
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110 |
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111 | inline bool operator<(const fileinfoelement &x, const fileinfoelement &y) {
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112 | return (x.otherinfo<y.otherinfo);
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113 | }
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114 |
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115 | typedef map<text_t, fileinfoelement, lttext_t> fileinfomap;
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116 |
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117 |
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118 | typedef map<text_t, text_t, lttext_t> paramhashtype;
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119 |
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120 |
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121 | struct paramspec
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122 | {
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123 | double spec;
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124 | text_t param;
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125 | };
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126 |
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127 | inline bool operator==(const paramspec& x, const paramspec& y)
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128 | {
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129 | return ((x.spec == y.spec) && (x.param == y.param));
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130 | }
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131 |
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132 | inline bool operator!=(const paramspec& x, const paramspec& y)
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133 | {
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134 | return ((x.spec != y.spec) || (x.param != y.param));
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135 | }
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136 |
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137 | // note: paramspec is sorted by reverse spec and then param
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138 |
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139 | inline bool operator<(const paramspec& x, const paramspec& y)
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140 | {
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141 | return ((x.spec > y.spec) ||
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142 | ((x.spec == y.spec) && (x.param < y.param)));
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143 | }
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144 |
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145 | inline bool operator>(const paramspec& x, const paramspec& y)
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146 | {
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147 | return ((x.spec < y.spec) ||
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148 | ((x.spec == y.spec) && (x.param > y.param)));
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149 | }
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150 |
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151 | typedef vector<paramspec> paramspeclist;
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152 |
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153 |
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154 | // NOTE: when macros are used within text they should have
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155 | // underscores '_' on both sides, however, in calls to
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156 | // setdefaultmacro and setmacro they should not have the
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157 | // underscores. So you might have
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158 | //
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159 | // setmacro ("aname", "query", " some text ");
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160 | // expandstring ("_aname_", expandedtext);
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161 | //
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162 | // because the input to expandstring is a block of text, not
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163 | // a macroname
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164 |
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165 | class displayclass
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166 | {
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167 | public:
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168 | static text_t defaultpackage;
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169 |
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170 | displayclass ();
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171 | ~displayclass ();
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172 |
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173 | // isdefaultmacro sees if there is an entry in the list of
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174 | // default macros with the given package and macro name
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175 | // returns 0 if no macros in the package or in the global package
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176 | // were found
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177 | // 1 if no macros in the package were found but a macro
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178 | // in the global package was found
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179 | // 2 if a macro in the given package was found
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180 | int isdefaultmacro (const text_t &package, const text_t ¯oname);
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181 |
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182 | // setdefaultmacro adds an entry to the list of default macros
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183 | // returns 0 if there was no error,
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184 | // -1 if it redefined a macro
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185 | // -2 if it hid a Global macro
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186 | // -3 if it redefined a macro and hid a Global macro
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187 | // -4 if no macroname was supplied
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188 | int setdefaultmacro (const text_t &package,
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189 | const text_t ¯oname,
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190 | const text_t ¶ms,
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191 | const text_t ¯ovalue);
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192 |
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193 | // loads a default macro file (if it isn't already loaded)
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194 | // returns 0 if didn't need to load the file (it was already loaded)
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195 | // 1 if was (re)loaded
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196 | // -1 an error occurred while trying to load the file
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197 | int loaddefaultmacros (const text_t &thisfilename);
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198 |
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199 |
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200 | // overrides (or sets) a macro for the current page.
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201 | // returns 0 if there was no error,
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202 | // -1 if it redefined a macro
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203 | // -4 if no macroname was supplied
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204 | int setcollectionmacro (const text_t &package,
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205 | const text_t ¯oname,
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206 | text_t params,
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207 | const text_t ¯ovalue);
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208 |
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209 | // loads a collection specific macro file
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210 | // returns 0 if didn't need to load the file (it was already loaded)
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211 | // 1 if was (re)loaded
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212 | // -1 an error occurred while trying to load the file
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213 | int loadcollectionmacros (const text_t &thisfilename);
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214 |
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215 | // unloads all default macros
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216 | void unloaddefaultmacros ();
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217 |
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218 | // unloads all collection specific macros
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219 | void unloadcollectionmacros ();
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220 |
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221 | // prepares to create a page: deletes all macros set with
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222 | // 'setmacro', checks all the default macro files to see
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223 | // if any need reloading, and sets the page parameters.
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224 | void openpage (const text_t &thispageparams,
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225 | const text_t &thisprecedence);
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226 |
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227 | // changes the parameters for the current page.
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228 | void setpageparams (text_t thispageparams,
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229 | text_t thisprecedence);
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230 |
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231 | // overrides (or sets) a macro for the current page.
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232 | // returns 0 if there was no error,
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233 | // -1 if it redefined a macro
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234 | // -4 if no macroname was supplied
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235 | int setmacro (const text_t ¯oname,
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236 | const text_t &package,
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237 | const text_t ¯ovalue);
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238 |
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239 | // havemacro sees if there is an entry in the list of macros or
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240 | // default macros with the given package and macro name
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241 | // returns 0 if no macros in the package or in the global package
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242 | // were found
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243 | // 1 if no macros in the package were found but a macro
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244 | // in the global package was found
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245 | // 2 if a macro in the given package was found
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246 | // 4 if no macros in the package were found but a macro
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247 | // in the global package was found in default macros
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248 | // 8 if a macro in the given package was found in default
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249 | int havemacro(const text_t &package, const text_t ¯oname);
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250 |
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251 | int setmacroif (const text_t ¯o_to_set_and_test,
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252 | const text_t ¯o_to_set_if_macro_not_set,
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253 | const text_t ¯oname,
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254 | const text_t& package);
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255 |
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256 | inline void expandstring (const text_t &inputtext, text_t &outputtext) { expandstring(defaultpackage, inputtext, outputtext); }
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257 |
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258 | void expandstring (const text_t &package, const text_t &inputtext,
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259 | text_t &outputtext, int recursiondepth = 0);
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260 |
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261 | // these functions are not ment to be used directly, they are used to permit
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262 | // concise stream output like:
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263 | // cout << text_t2ascii << display << "_amacro_" << "_anothermacro_";
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264 | void setconvertclass (outconvertclass *theoutc) {outc = theoutc;}
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265 | outconvertclass *getconvertclass () {return outc;}
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266 |
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267 | // say where any error logging goes, this can be NULL
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268 | // if no error logging is desired - returns previous value
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269 | ostream *displayclass::setlogout (ostream *thelogout);
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270 |
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271 | // debug stuff
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272 | void printdefaultmacros ();
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273 | void printallparams ();
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274 |
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275 | protected:
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276 | // special variables to permit trickly output
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277 | outconvertclass *outc;
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278 |
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279 | // general variables
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280 | text_tset allparams; // possible parameter combinations
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281 | parammacros_t *defaultmacros;
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282 | parammacros_t *collectionmacros;
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283 | fileinfomap *defaultfiles;
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284 |
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285 | // variables to do with a page expansion
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286 | text_t params;
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287 | text_t precedence;
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288 | paramspeclist *orderparamlist; // ordered by specificness
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289 | currentmacros_t *currentmacros; // only macros set by setmacro
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290 |
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291 | // logging variable
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292 | ostream *logout;
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293 |
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294 | // reloads any default macro files which have changed
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295 | // returns 0 no errors occurred
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296 | // -1 an error occurred while trying to load one of the files
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297 | int checkdefaultmacrofiles ();
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298 |
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299 | int loadparammacros (parammacros_t* macrotable, const text_t &thisfilename);
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300 |
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301 | int setparammacro (parammacros_t* macrotable,
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302 | const text_t &package,
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303 | const text_t ¯oname,
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304 | text_t params, const text_t &filename,
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305 | const text_t ¯ovalue);
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306 |
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307 | int setdefaultmacro (const text_t &package,
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308 | const text_t ¯oname,
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309 | text_t params, const text_t &filename,
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310 | const text_t ¯ovalue);
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311 |
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312 | int setcollectionmacro(const text_t &package,
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313 | const text_t ¯oname,
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314 | text_t params,
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315 | const text_t &filename,
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316 | const text_t ¯ovalue);
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317 |
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318 | // evaluates a boolean expression
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319 | bool boolexpr (const text_t &package, const text_t &expr,
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320 | int recursiondepth);
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321 |
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322 | mvalue* macro_find (parammacros_t* macrotable,
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323 | const text_t &packagename,
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324 | const text_t ¯oname);
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325 |
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326 | // (recursively) expand out a macro
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327 | // returns true if the macro was found
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328 | // false if the macro was not found
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329 | bool macro (const text_t ¯oname,
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330 | const text_t ¯opackage,
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331 | const text_t ¯oparam, text_t &outputtext,
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332 | int recursiondepth);
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333 | };
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334 |
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335 |
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336 | displayclass &operator<< (outconvertclass &theoutc, displayclass &display);
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337 | displayclass &operator<< (displayclass &display, const text_t &t);
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338 |
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339 | #endif
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