[100] | 1 | /**********************************************************************
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[12] | 2 | *
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[100] | 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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[12] | 5 | *
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[100] | 6 | * PUT COPYRIGHT NOTICE HERE
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[12] | 7 | *
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| 8 | * $Id: display.h 182 1999-03-01 20:39:56Z sjboddie $
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| 9 | *
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[100] | 10 | *********************************************************************/
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[12] | 11 |
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| 12 |
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| 13 | #ifndef DISPLAY_H
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| 14 | #define DISPLAY_H
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| 15 |
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[114] | 16 | #include "gsdlconf.h"
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[12] | 17 | #include "text_t.h"
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| 18 |
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| 19 |
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[114] | 20 | #if defined(GSDL_USE_OBJECTSPACE)
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| 21 | # include <ospace\std\vector>
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| 22 | # include <ospace\std\list>
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| 23 | # include <ospace\std\set>
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| 24 | # include <ospace\std\map>
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| 25 | # include <ospace\std\algorithm>
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| 26 | #elif defined(GSDL_USE_STL_H)
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| 27 | # include <vector.h>
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| 28 | # include <list.h>
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| 29 | # include <set.h>
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| 30 | # include <map.h>
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| 31 | # if defined(GSDL_USE_ALGO_H)
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| 32 | # include <algo.h>
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| 33 | # else
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| 34 | # include <algorithm.h>
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| 35 | # endif
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| 36 | #else
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[12] | 37 | # include <vector>
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| 38 | # include <list>
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| 39 | # include <set>
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| 40 | # include <map>
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| 41 | # include <algorithm>
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| 42 | #endif
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| 43 |
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[114] | 44 | #if defined(GSDL_USE_OBJECTSPACE)
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| 45 | # include <ospace\std\iostream>
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| 46 | # include <ospace\std\fstream>
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| 47 | #elif defined(GSDL_USE_IOS_H)
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[91] | 48 | # include <iostream.h>
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| 49 | # include <fstream.h>
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| 50 | #else
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[114] | 51 | # include <iostream>
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| 52 | # include <fstream>
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[91] | 53 | #endif
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| 54 |
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| 55 |
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[12] | 56 | // use the standard namespace
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[114] | 57 | #if defined(GSDL_USE_OBJECTSPACE)
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| 58 | using namespace ospace::std;
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| 59 | #elif !defined(GSDL_NAMESPACE_BROKEN)
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[12] | 60 | using namespace std;
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| 61 | #endif
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| 62 |
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| 63 |
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| 64 |
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| 65 | // MAXRECURSIONDEPTH is a cutoff to catch
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| 66 | // cyclic macros (a includes b and b includes a)
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| 67 | #define MAXRECURSIONDEPTH 30
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| 68 |
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| 69 |
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| 70 | // class prototypes
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| 71 | class defaultmacros_t;
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| 72 | class currentmacros_t;
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| 73 |
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| 74 | // a few supporting types
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| 75 | // fileelement isn't finished yet, I have to find out
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| 76 | // more about getting information about files
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| 77 | struct fileinfoelement
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| 78 | {
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| 79 | int otherinfo;
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| 80 | };
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| 81 |
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[114] | 82 | inline bool operator==(const fileinfoelement &x, const fileinfoelement &y) {
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| 83 | return (x.otherinfo==y.otherinfo);
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| 84 | }
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| 85 |
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| 86 | inline bool operator<(const fileinfoelement &x, const fileinfoelement &y) {
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| 87 | return (x.otherinfo<y.otherinfo);
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| 88 | }
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| 89 |
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[12] | 90 | typedef map<text_t, fileinfoelement, lttext_t> fileinfomap;
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| 91 |
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| 92 |
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| 93 | typedef map<text_t, text_t, lttext_t> paramhashtype;
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| 94 |
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| 95 |
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| 96 | struct paramspec
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| 97 | {
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| 98 | double spec;
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| 99 | text_t param;
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| 100 | };
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| 101 |
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| 102 | inline bool operator==(const paramspec& x, const paramspec& y)
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| 103 | {
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| 104 | return ((x.spec == y.spec) && (x.param == y.param));
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| 105 | }
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| 106 |
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| 107 | inline bool operator!=(const paramspec& x, const paramspec& y)
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| 108 | {
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| 109 | return ((x.spec != y.spec) || (x.param != y.param));
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| 110 | }
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| 111 |
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| 112 | // note: paramspec is sorted by reverse spec and then param
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| 113 |
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| 114 | inline bool operator<(const paramspec& x, const paramspec& y)
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| 115 | {
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| 116 | return ((x.spec > y.spec) ||
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| 117 | ((x.spec == y.spec) && (x.param < y.param)));
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| 118 | }
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| 119 |
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| 120 | inline bool operator>(const paramspec& x, const paramspec& y)
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| 121 | {
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| 122 | return ((x.spec < y.spec) ||
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| 123 | ((x.spec == y.spec) && (x.param > y.param)));
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| 124 | }
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| 125 |
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| 126 | typedef vector<paramspec> paramspeclist;
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| 127 |
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| 128 |
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| 129 | // NOTE: when macros are used within text they should have
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| 130 | // underscores '_' on both sides, however, in calls to
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| 131 | // setdefaultmacro and setmacro they should not have the
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| 132 | // underscores. So you might have
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| 133 | //
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| 134 | // setmacro ("aname", "query", " some text ");
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| 135 | // expandstring ("_aname_", expandedtext);
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| 136 | //
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| 137 | // because the input to expandstring is a block of text, not
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| 138 | // a macroname
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| 139 |
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| 140 | class displayclass
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| 141 | {
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| 142 | public:
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| 143 | displayclass ();
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| 144 | ~displayclass ();
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| 145 |
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[118] | 146 | // isdefaultmacro sees if there is an entry in the list of
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| 147 | // default macros with the given package and macro name
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| 148 | // returns 0 if no macros in the package or in the global package
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| 149 | // were found
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| 150 | // 1 if no macros in the package were found but a macro
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| 151 | // in the global package was found
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| 152 | // 2 if a macro in the given package was found
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| 153 | int isdefaultmacro (text_t package, const text_t ¯oname);
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| 154 |
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[12] | 155 | // setdefaultmacro adds an entry to the list of default macros
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| 156 | // returns 0 if there was no error,
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| 157 | // -1 if it redefined a macro
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| 158 | // -2 if it hid a Global macro
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| 159 | // -3 if it redefined a macro and hid a Global macro
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| 160 | // -4 if no macroname was supplied
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| 161 | int setdefaultmacro (text_t package, const text_t ¯oname,
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| 162 | text_t params, const text_t ¯ovalue);
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| 163 |
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| 164 | // loads a default macro file (if it isn't already loaded)
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| 165 | // returns 0 if didn't need to load the file (it was already loaded)
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| 166 | // 1 if was (re)loaded
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| 167 | // -1 an error occurred while trying to load the file
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| 168 | int loaddefaultmacros (text_t thisfilename);
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| 169 |
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| 170 | // prepares to create a page: deletes all macros set with
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| 171 | // 'setmacro', checks all the default macro files to see
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| 172 | // if any need reloading, and sets the page parameters.
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| 173 | void openpage (const text_t &thispageparams,
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| 174 | const text_t &thisprecedence);
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| 175 |
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| 176 | // changes the parameters for the current page.
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| 177 | void setpageparams (text_t thispageparams,
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| 178 | text_t thisprecedence);
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| 179 |
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| 180 | // overrides (or sets) a macro for the current page.
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| 181 | // returns 0 if there was no error,
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| 182 | // -1 if it redefined a macro
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| 183 | // -4 if no macroname was supplied
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| 184 | int setmacro (const text_t ¯oname,
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| 185 | text_t package,
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| 186 | const text_t ¯ovalue);
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| 187 |
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| 188 | void expandstring (const text_t &inputtext, text_t &outputtext);
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| 189 | void expandstring (text_t package, const text_t &inputtext,
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| 190 | text_t &outputtext, int recursiondepth = 0);
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| 191 |
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| 192 | // these functions are not ment to be used directly, they are used to permit
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| 193 | // concise stream output like:
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| 194 | // cout << text_t2ascii << display << "_amacro_" << "_anothermacro_";
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| 195 | void setconvertclass (outconvertclass *theoutc) {outc = theoutc;}
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| 196 | outconvertclass *getconvertclass () {return outc;}
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| 197 |
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[91] | 198 | // say where any error logging goes, this can be NULL
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| 199 | // if no error logging is desired
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| 200 | void setlogout (ostream *thelogout) {logout = thelogout;}
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[12] | 201 |
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| 202 | // debug stuff
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| 203 | void printdefaultmacros ();
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| 204 | void printallparams ();
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| 205 |
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| 206 | protected:
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| 207 | // special variables to permit trickly output
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| 208 | outconvertclass *outc;
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| 209 |
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| 210 | // general variables
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| 211 | text_tset allparams; // possible parameter combinations
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| 212 | defaultmacros_t *defaultmacros;
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| 213 | fileinfomap *defaultfiles;
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| 214 |
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| 215 | // variables to do with a page expansion
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| 216 | text_t params;
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| 217 | text_t precedence;
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| 218 | paramspeclist *orderparamlist; // ordered by specificness
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| 219 | currentmacros_t *currentmacros; // only macros set by setmacro
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[91] | 220 |
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| 221 | // logging variable
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| 222 | ostream *logout;
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| 223 |
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[12] | 224 | // reloads any default macro files which have changed
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| 225 | // returns 0 no errors occurred
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| 226 | // -1 an error occurred while trying to load one of the files
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| 227 | int checkdefaultmacrofiles ();
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| 228 |
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| 229 | int setdefaultmacro (text_t package, const text_t ¯oname,
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| 230 | text_t params, const text_t &filename,
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| 231 | const text_t ¯ovalue);
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| 232 |
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[182] | 233 | // evaluates a boolean expression
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| 234 | bool boolexpr (text_t package, const text_t &expr, int recursiondepth);
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| 235 |
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[12] | 236 | // (recursively) expand out a macro
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| 237 | // returns true if the macro was found
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| 238 | // false if the macro was not found
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| 239 | bool macro (const text_t ¯oname, text_t macropackage,
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| 240 | const text_t ¯oparam, text_t &outputtext,
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| 241 | int recursiondepth);
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| 242 | };
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| 243 |
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| 244 |
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| 245 | displayclass &operator<< (outconvertclass &theoutc, displayclass &display);
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| 246 | displayclass &operator<< (displayclass &display, const text_t &t);
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| 247 |
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| 248 | #endif
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| 249 |
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