Mercurial > ~dholland > hg > ag > index.cgi
view examples/dsl/symbol.cpp @ 16:f9e4689b837d
Some minor updates for 15 years later.
author | David A. Holland |
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date | Tue, 31 May 2022 01:45:26 -0400 |
parents | 13d2b8934445 |
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/***** AnaGram Programming Examples A Dos Script Language Symbol Table Definitions Copyright 1993 Parsifal Software. All Rights Reserved. This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software. Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions: 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. 3. This notice may not be removed or altered from any source distribution. *****/ #include "symbol.h" #include <strdict.h> #include <charsink.h> #include <ctype.h> #include "util.h" extern string_accumulator sa; extern string_dictionary sd; extern unsigned stderr_index; action_pointer copy_action(void); void release(action_descriptor *d) { delete [] d->args; delete [] d->ap.pointer; delete d; } void release(symbol_table_entry &s) { switch (s.type) { case string_type: case value_type: { delete [] s.data.text; break; } case action_type: { release(s.data.action); break; } default: /* not supposed to happen? */ break; } s.data.integer = 0; } void define_action(int n) { unsigned index; action_descriptor *d = new action_descriptor; d->args = new unsigned[n]; d->n_args = n; d->ap = copy_action(); while (n--) { d->args[n] = sd << (sa--).top(); } index = sd << (sa--).top(); release(st[index]); st[index].type = action_type; st[index].data.action = d; } void define_integer(const char *name, long value) { unsigned index = sd << name; release(st[index]); st[index].type = integer_type; st[index].data.integer = value; } void define_string(void) { char *text = copy(sa--); unsigned index = sd << (sa--).top(); release(st[index]); st[index].type = string_type; st[index].data.text = text; } const char *dos_internals[] = { "CD", "CHCP", "CHDIR", "CLS", "COPY", "CTTY", "DATE", "DEL", "DIR", "ERASE", "MD", "MKDIR", "PATH", "PROMPT", "RD", "REN", "RENAME", "RMDIR", "SET", "TIME", "TYPE", "VER", "VERIFY", "VOL", "CHKDSK", "COMP", "DISKCOMP", "DISKCOPY", "KEYB", "LABEL", "MODE", "PRINT", "RECOVER", NULL, }; extern internal_commands_descriptor internal_commands[]; extern struct built_ins_descriptor built_ins[]; extern unsigned errorlevel_index; void set_arg(int n, char *arg) { unsigned index; (++sa).printf("argv[%d]", n); index = sd << (sa--).top(); st[index].type = string_type; st[index].data.text = arg; } void init_dos_internals(void) { int i; unsigned index; for (i = 0; dos_internals[i]; i++) { st[sd << dos_internals[i]].type = dos_type; } for (i = 0; internal_commands[i].name; i++) { index = sd << internal_commands[i].name; st[index].type = internal_type; st[index].data.proc = internal_commands[i].proc; } for (i = 0; built_ins[i].name; i++) { index = sd << built_ins[i].name; st[index].type = built_in_function_type; st[index].data.func = built_ins[i].proc; } define_integer("errorlevel", 0); errorlevel_index = sd["errorlevel"]; index = stderr_index = sd << "stderr"; st[index].type = string_type; st[index].data.text = NULL; }