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6 wxExpr can be used to develop programs with readable and
7 robust data files. Within wxWidgets itself, it is used to parse
14 programs to read, was robust in the face of fast-moving software
18 The result was the wxExpr library (formerly called PrologIO), which is able to read and write a
25 \item I/O routines are easier to write and debug compared with using binary files;
32 The library was extended to use the ability to read and write
72 This is substantially easier to read and debug than a series of numbers and
81 The way that the facility is used by an application to read in a file is
86 \item The application tells the database to read in the entire file.
97 \item The application adds objects to the database using the API.
98 \item The application tells the database to write out the entire database,
108 the makefile uses the correct programs: a common error is to compile
110 to specify a C compiler. Also, do not attempt to compile lex\_yy.c
113 For DOS compilation, the simplest thing is to copy dosyacc.c to y\_tab.c, and doslex.c to
115 y\_tab.c) so if adding source files to a project file, ONLY add y\_tab.c
116 plus the .cc files. If you wish to alter the parser, you will need YACC
120 for FLEX installation, you need to copy flex.skl into the directory
123 If you are using Borland C++ and wish to regenerate lex\_yy.c and y\_tab.c
124 you need to generate lex\_yy.c with FLEX and then comment out the `malloc' and `free'
126 get an undefined \_PROIO\_YYWRAP symbol when you link, you need to remove
130 parser.y, and if necessary edit it to make it compile in the opposite
131 way to the current compilation.
135 %program. Then save it to another file. If the second is identical to the
146 \item There is a limit to the size of strings read in (about 5000 bytes).
151 This section is a brief introduction to using the wxExpr package.
154 each of which represents an object or record which needs to be saved to a file.
174 This creates a database, constructs a clause, adds it to the database,
175 and writes the whole database to a file. The file it produces looks like
201 Note the setting of defaults before attempting to retrieve attribute values,