140 lines
3 KiB
C
140 lines
3 KiB
C
/***************************************************************************
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CExpression.c
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(c) 2000-2007 Benoit Minisini <gambas@freesurf.fr>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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***************************************************************************/
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#define __CEXPRESSION_C
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#include "gb_common.h"
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#include "gambas.h"
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#include "eval.h"
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#include "main.h"
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#include "CExpression.h"
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/*#define DEBUG*/
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static CEXPRESSION *_current;
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BEGIN_METHOD_VOID(CEXPRESSION_new)
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THIS->compiled = FALSE;
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CLEAR(&THIS->expr);
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END_METHOD
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BEGIN_METHOD_VOID(CEXPRESSION_free)
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EVAL_clear(&THIS->expr);
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GB.FreeString(&THIS->text);
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GB.FreeString(&THIS->expr.source);
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GB.Unref((void **)&THIS->env);
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END_METHOD
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BEGIN_PROPERTY(CEXPRESSION_text)
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if (READ_PROPERTY)
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GB.ReturnString(THIS->text);
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else
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{
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GB.StoreString(PROP(GB_STRING), &THIS->text);
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GB.FreeString(&THIS->expr.source);
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GB.NewString(&THIS->expr.source, THIS->text, VPROP(GB_STRING).len);
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THIS->expr.len = VPROP(GB_STRING).len;
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THIS->compiled = FALSE;
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}
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END_PROPERTY
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BEGIN_PROPERTY(CEXPRESSION_environment)
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if (READ_PROPERTY)
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GB.ReturnObject(THIS->env);
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else
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GB.StoreObject(PROP(GB_OBJECT), &THIS->env);
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END_PROPERTY
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BEGIN_METHOD_VOID(CEXPRESSION_prepare)
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if (!THIS->compiled && (THIS->expr.len > 0))
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{
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if (!EVAL_compile(&THIS->expr))
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THIS->compiled = TRUE;
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}
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END_METHOD
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static bool get_variable(const char *sym, long len, GB_VARIANT *value)
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{
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if (_current->env)
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if (!GB.Collection.Get(_current->env, sym, len, value))
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return FALSE;
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value->type = GB_T_NULL;
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return TRUE;
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}
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BEGIN_PROPERTY(CEXPRESSION_value)
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if (!THIS->compiled)
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CALL_METHOD_VOID(CEXPRESSION_prepare);
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if (!THIS->compiled)
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{
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GB.ReturnNull();
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return;
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}
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_current = THIS;
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EVAL_expression(&THIS->expr, (EVAL_FUNCTION)get_variable);
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END_PROPERTY
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GB_DESC CExpressionDesc[] =
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{
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GB_DECLARE("Expression", sizeof(CEXPRESSION)),
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//GB_STATIC_METHOD("_init", NULL, CEXPRESSION_init, NULL),
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//GB_STATIC_METHOD("_exit", NULL, CEXPRESSION_exit, NULL),
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GB_METHOD("_new", NULL, CEXPRESSION_new, NULL),
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GB_METHOD("_free", NULL, CEXPRESSION_free, NULL),
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GB_PROPERTY("Text", "s", CEXPRESSION_text),
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GB_PROPERTY("Environment", "Collection;", CEXPRESSION_environment),
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GB_METHOD("Compile", NULL, CEXPRESSION_prepare, NULL),
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GB_PROPERTY_READ("Value", "v", CEXPRESSION_value),
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GB_END_DECLARE
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};
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