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lscript_typecheck.cpp
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/**
* @file lscript_typecheck.cpp
* @brief typechecks script
*
* $LicenseInfo:firstyear=2002&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "linden_common.h"
#include "lscript_tree.h"
/*
LScript automatic type casting
LST_INTEGER -> LST_INTEGER
LST_FLOATINGPOINT -> LST_FLOATINGPOINT
LST_INTEGER -> LST_FLOATINGPOINT
LST_FLOATINGPOINT -> LST_STRING
LST_INTEGER -> LST_STRING
LST_STRING -> LST_STRING
LST_VECTOR -> LST_STRING
LST_QUATERNION -> LST_STRING
LST_LIST -> LST_STRING
LST_VECTOR -> LST_VECTOR
LST_QUATERNION -> LST_QUATERNION
LST_FLOATINGPOINT -> LST_LIST
LST_INTEGER -> LST_LIST
LST_STRING -> LST_LIST
LST_VECTOR -> LST_LIST
LST_QUATERNION -> LST_LIST
LST_LIST -> LST_LIST
*/
LSCRIPTType implicit_casts(LSCRIPTType left_side, LSCRIPTType right_side)
{
switch(left_side)
{
// shouldn't be doing an operation on void types
case LST_NULL:
switch(right_side)
{
case LST_NULL:
return LST_NULL;
default:
return LST_UNDEFINED;
}
// shouldn't be doing an operation on undefined types
case LST_UNDEFINED:
return LST_UNDEFINED;
// only integers can become integers
case LST_INTEGER:
switch(right_side)
{
case LST_INTEGER:
return LST_INTEGER;
default:
return LST_UNDEFINED;
}
// only integers and floats can become floats
case LST_FLOATINGPOINT:
switch(right_side)
{
case LST_INTEGER:
case LST_FLOATINGPOINT:
return LST_FLOATINGPOINT;
default:
return LST_UNDEFINED;
}
// only strings and keys can become strings
case LST_STRING:
switch(right_side)
{
case LST_STRING:
case LST_KEY:
return LST_STRING;
default:
return LST_UNDEFINED;
}
// only strings and keys can become keys
case LST_KEY:
switch(right_side)
{
case LST_STRING:
case LST_KEY:
return LST_KEY;
default:
return LST_UNDEFINED;
}
// only vectors can become vectors
case LST_VECTOR:
switch(right_side)
{
case LST_VECTOR:
return LST_VECTOR;
default:
return LST_UNDEFINED;
}
// only quaternions can become quaternions
case LST_QUATERNION:
switch(right_side)
{
case LST_QUATERNION:
return LST_QUATERNION;
default:
return LST_UNDEFINED;
}
// only lists can become lists
case LST_LIST:
switch(right_side)
{
case LST_LIST:
return LST_LIST;
default:
return LST_UNDEFINED;
}
default:
return LST_UNDEFINED;
}
}
LSCRIPTType promote(LSCRIPTType left_side, LSCRIPTType right_side)
{
LSCRIPTType type;
type = implicit_casts(left_side, right_side);
if (type != LST_UNDEFINED)
{
return type;
}
type = implicit_casts(right_side, left_side);
if (type != LST_UNDEFINED)
{
return type;
}
return LST_UNDEFINED;
}
BOOL legal_assignment(LSCRIPTType left_side, LSCRIPTType right_side)
{
// this is to prevent cascading errors
if ( (left_side == LST_UNDEFINED)
||(right_side == LST_UNDEFINED))
{
return TRUE;
}
if (implicit_casts(left_side, right_side) != LST_UNDEFINED)
{
return TRUE;
}
else
{
return FALSE;
}
}
BOOL legal_casts(LSCRIPTType cast, LSCRIPTType base)
{
switch(base)
{
// shouldn't be doing an operation on void types
case LST_NULL:
return FALSE;
// shouldn't be doing an operation on undefined types
case LST_UNDEFINED:
return FALSE;
case LST_INTEGER:
switch(cast)
{
case LST_INTEGER:
case LST_FLOATINGPOINT:
case LST_STRING:
case LST_LIST:
return TRUE;
break;
default:
return FALSE;
break;
}
break;
case LST_FLOATINGPOINT:
switch(cast)
{
case LST_INTEGER:
case LST_FLOATINGPOINT:
case LST_STRING:
case LST_LIST:
return TRUE;
break;
default:
return FALSE;
break;
}
break;
case LST_STRING:
switch(cast)
{
case LST_INTEGER:
case LST_FLOATINGPOINT:
case LST_STRING:
case LST_KEY:
case LST_VECTOR:
case LST_QUATERNION:
case LST_LIST:
return TRUE;
break;
default:
return FALSE;
break;
}
break;
case LST_KEY:
switch(cast)
{
case LST_STRING:
case LST_KEY:
case LST_LIST:
return TRUE;
break;
default:
return FALSE;
break;
}
break;
case LST_VECTOR:
switch(cast)
{
case LST_VECTOR:
case LST_STRING:
case LST_LIST:
return TRUE;
break;
default:
return FALSE;
break;
}
break;
case LST_QUATERNION:
switch(cast)
{
case LST_QUATERNION:
case LST_STRING:
case LST_LIST:
return TRUE;
break;
default:
return FALSE;
break;
}
break;
// lists can only be cast to lists and strings
case LST_LIST:
switch(cast)
{
case LST_LIST:
case LST_STRING:
return TRUE;
break;
default:
return FALSE;
break;
}
break;
default:
return FALSE;
break;
}
}
LSCRIPTType gSupportedExpressionArray[LET_EOF][LST_EOF][LST_EOF];
void init_supported_expressions(void)
{
S32 i, j, k;
// zero out, then set the ones that matter
for (i = 0; i < LET_EOF; i++)
{
for (j = 0; j < LST_EOF; j++)
{
for (k = 0; k < LST_EOF; k++)
{
gSupportedExpressionArray[i][j][k] = LST_NULL;
}
}
}
// LET_ASSIGNMENT
gSupportedExpressionArray[LET_ASSIGNMENT][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_ASSIGNMENT][LST_FLOATINGPOINT][LST_INTEGER] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_ASSIGNMENT][LST_INTEGER][LST_FLOATINGPOINT] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_ASSIGNMENT][LST_FLOATINGPOINT][LST_FLOATINGPOINT] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_ASSIGNMENT][LST_STRING][LST_STRING] = LST_STRING;
gSupportedExpressionArray[LET_ASSIGNMENT][LST_KEY][LST_KEY] = LST_KEY;
gSupportedExpressionArray[LET_ASSIGNMENT][LST_VECTOR][LST_VECTOR] = LST_VECTOR;
gSupportedExpressionArray[LET_ASSIGNMENT][LST_QUATERNION][LST_QUATERNION] = LST_QUATERNION;
gSupportedExpressionArray[LET_ASSIGNMENT][LST_LIST][LST_INTEGER] = LST_LIST;
gSupportedExpressionArray[LET_ASSIGNMENT][LST_LIST][LST_FLOATINGPOINT] = LST_LIST;
gSupportedExpressionArray[LET_ASSIGNMENT][LST_LIST][LST_STRING] = LST_LIST;
gSupportedExpressionArray[LET_ASSIGNMENT][LST_LIST][LST_KEY] = LST_LIST;
gSupportedExpressionArray[LET_ASSIGNMENT][LST_LIST][LST_VECTOR] = LST_LIST;
gSupportedExpressionArray[LET_ASSIGNMENT][LST_LIST][LST_QUATERNION] = LST_LIST;
gSupportedExpressionArray[LET_ASSIGNMENT][LST_LIST][LST_LIST] = LST_LIST;
// LET_ADD_ASSIGN
gSupportedExpressionArray[LET_ADD_ASSIGN][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_ADD_ASSIGN][LST_FLOATINGPOINT][LST_INTEGER] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_ADD_ASSIGN][LST_FLOATINGPOINT][LST_FLOATINGPOINT] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_ADD_ASSIGN][LST_STRING][LST_STRING] = LST_STRING;
gSupportedExpressionArray[LET_ADD_ASSIGN][LST_VECTOR][LST_VECTOR] = LST_VECTOR;
gSupportedExpressionArray[LET_ADD_ASSIGN][LST_QUATERNION][LST_QUATERNION] = LST_QUATERNION;
gSupportedExpressionArray[LET_ADD_ASSIGN][LST_LIST][LST_INTEGER] = LST_LIST;
gSupportedExpressionArray[LET_ADD_ASSIGN][LST_LIST][LST_FLOATINGPOINT] = LST_LIST;
gSupportedExpressionArray[LET_ADD_ASSIGN][LST_LIST][LST_STRING] = LST_LIST;
gSupportedExpressionArray[LET_ADD_ASSIGN][LST_LIST][LST_KEY] = LST_LIST;
gSupportedExpressionArray[LET_ADD_ASSIGN][LST_LIST][LST_VECTOR] = LST_LIST;
gSupportedExpressionArray[LET_ADD_ASSIGN][LST_LIST][LST_QUATERNION] = LST_LIST;
gSupportedExpressionArray[LET_ADD_ASSIGN][LST_LIST][LST_LIST] = LST_LIST;
// LET_SUB_ASSIGN
gSupportedExpressionArray[LET_SUB_ASSIGN][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_SUB_ASSIGN][LST_FLOATINGPOINT][LST_INTEGER] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_SUB_ASSIGN][LST_FLOATINGPOINT][LST_FLOATINGPOINT] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_SUB_ASSIGN][LST_VECTOR][LST_VECTOR] = LST_VECTOR;
gSupportedExpressionArray[LET_SUB_ASSIGN][LST_QUATERNION][LST_QUATERNION] = LST_QUATERNION;
// LET_MUL_ASSIGN
gSupportedExpressionArray[LET_MUL_ASSIGN][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_MUL_ASSIGN][LST_FLOATINGPOINT][LST_INTEGER] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_MUL_ASSIGN][LST_INTEGER][LST_FLOATINGPOINT] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_MUL_ASSIGN][LST_FLOATINGPOINT][LST_FLOATINGPOINT] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_MUL_ASSIGN][LST_VECTOR][LST_INTEGER] = LST_VECTOR;
//gSupportedExpressionArray[LET_MUL_ASSIGN][LST_INTEGER][LST_VECTOR] = LST_VECTOR;
gSupportedExpressionArray[LET_MUL_ASSIGN][LST_VECTOR][LST_FLOATINGPOINT] = LST_VECTOR;
//gSupportedExpressionArray[LET_MUL_ASSIGN][LST_FLOATINGPOINT][LST_VECTOR] = LST_VECTOR;
//gSupportedExpressionArray[LET_MUL_ASSIGN][LST_VECTOR][LST_VECTOR] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_MUL_ASSIGN][LST_VECTOR][LST_QUATERNION] = LST_VECTOR;
gSupportedExpressionArray[LET_MUL_ASSIGN][LST_QUATERNION][LST_QUATERNION] = LST_QUATERNION;
// LET_DIV_ASSIGN
gSupportedExpressionArray[LET_DIV_ASSIGN][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_DIV_ASSIGN][LST_FLOATINGPOINT][LST_INTEGER] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_DIV_ASSIGN][LST_FLOATINGPOINT][LST_FLOATINGPOINT] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_DIV_ASSIGN][LST_VECTOR][LST_INTEGER] = LST_VECTOR;
gSupportedExpressionArray[LET_DIV_ASSIGN][LST_VECTOR][LST_FLOATINGPOINT] = LST_VECTOR;
gSupportedExpressionArray[LET_DIV_ASSIGN][LST_VECTOR][LST_QUATERNION] = LST_VECTOR;
gSupportedExpressionArray[LET_DIV_ASSIGN][LST_QUATERNION][LST_QUATERNION] = LST_QUATERNION;
// LET_MOD_ASSIGN
gSupportedExpressionArray[LET_MOD_ASSIGN][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_MOD_ASSIGN][LST_VECTOR][LST_VECTOR] = LST_VECTOR;
// LET_EQUALITY
gSupportedExpressionArray[LET_EQUALITY][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_EQUALITY][LST_INTEGER][LST_FLOATINGPOINT] = LST_INTEGER;
gSupportedExpressionArray[LET_EQUALITY][LST_FLOATINGPOINT][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_EQUALITY][LST_FLOATINGPOINT][LST_FLOATINGPOINT] = LST_INTEGER;
gSupportedExpressionArray[LET_EQUALITY][LST_STRING][LST_STRING] = LST_INTEGER;
gSupportedExpressionArray[LET_EQUALITY][LST_STRING][LST_KEY] = LST_INTEGER;
gSupportedExpressionArray[LET_EQUALITY][LST_KEY][LST_STRING] = LST_INTEGER;
gSupportedExpressionArray[LET_EQUALITY][LST_KEY][LST_KEY] = LST_INTEGER;
gSupportedExpressionArray[LET_EQUALITY][LST_VECTOR][LST_VECTOR] = LST_INTEGER;
gSupportedExpressionArray[LET_EQUALITY][LST_QUATERNION][LST_QUATERNION] = LST_INTEGER;
gSupportedExpressionArray[LET_EQUALITY][LST_LIST][LST_LIST] = LST_INTEGER;
// LET_NOT_EQUALS
gSupportedExpressionArray[LET_NOT_EQUALS][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_NOT_EQUALS][LST_INTEGER][LST_FLOATINGPOINT] = LST_INTEGER;
gSupportedExpressionArray[LET_NOT_EQUALS][LST_FLOATINGPOINT][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_NOT_EQUALS][LST_FLOATINGPOINT][LST_FLOATINGPOINT] = LST_INTEGER;
gSupportedExpressionArray[LET_NOT_EQUALS][LST_STRING][LST_STRING] = LST_INTEGER;
gSupportedExpressionArray[LET_NOT_EQUALS][LST_STRING][LST_KEY] = LST_INTEGER;
gSupportedExpressionArray[LET_NOT_EQUALS][LST_KEY][LST_STRING] = LST_INTEGER;
gSupportedExpressionArray[LET_NOT_EQUALS][LST_KEY][LST_KEY] = LST_INTEGER;
gSupportedExpressionArray[LET_NOT_EQUALS][LST_VECTOR][LST_VECTOR] = LST_INTEGER;
gSupportedExpressionArray[LET_NOT_EQUALS][LST_QUATERNION][LST_QUATERNION] = LST_INTEGER;
gSupportedExpressionArray[LET_NOT_EQUALS][LST_LIST][LST_LIST] = LST_INTEGER;
// LET_LESS_EQUALS
gSupportedExpressionArray[LET_LESS_EQUALS][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_LESS_EQUALS][LST_INTEGER][LST_FLOATINGPOINT] = LST_INTEGER;
gSupportedExpressionArray[LET_LESS_EQUALS][LST_FLOATINGPOINT][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_LESS_EQUALS][LST_FLOATINGPOINT][LST_FLOATINGPOINT] = LST_INTEGER;
// LET_GREATER_EQUALS
gSupportedExpressionArray[LET_GREATER_EQUALS][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_GREATER_EQUALS][LST_INTEGER][LST_FLOATINGPOINT] = LST_INTEGER;
gSupportedExpressionArray[LET_GREATER_EQUALS][LST_FLOATINGPOINT][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_GREATER_EQUALS][LST_FLOATINGPOINT][LST_FLOATINGPOINT] = LST_INTEGER;
// LET_LESS_THAN
gSupportedExpressionArray[LET_LESS_THAN][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_LESS_THAN][LST_INTEGER][LST_FLOATINGPOINT] = LST_INTEGER;
gSupportedExpressionArray[LET_LESS_THAN][LST_FLOATINGPOINT][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_LESS_THAN][LST_FLOATINGPOINT][LST_FLOATINGPOINT] = LST_INTEGER;
// LET_GREATER_THAN
gSupportedExpressionArray[LET_GREATER_THAN][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_GREATER_THAN][LST_INTEGER][LST_FLOATINGPOINT] = LST_INTEGER;
gSupportedExpressionArray[LET_GREATER_THAN][LST_FLOATINGPOINT][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_GREATER_THAN][LST_FLOATINGPOINT][LST_FLOATINGPOINT] = LST_INTEGER;
// LET_PLUS
gSupportedExpressionArray[LET_PLUS][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_PLUS][LST_FLOATINGPOINT][LST_INTEGER] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_PLUS][LST_INTEGER][LST_FLOATINGPOINT] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_PLUS][LST_FLOATINGPOINT][LST_FLOATINGPOINT] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_PLUS][LST_STRING][LST_STRING] = LST_STRING;
gSupportedExpressionArray[LET_PLUS][LST_VECTOR][LST_VECTOR] = LST_VECTOR;
gSupportedExpressionArray[LET_PLUS][LST_QUATERNION][LST_QUATERNION] = LST_QUATERNION;
gSupportedExpressionArray[LET_PLUS][LST_LIST][LST_INTEGER] = LST_LIST;
gSupportedExpressionArray[LET_PLUS][LST_LIST][LST_FLOATINGPOINT] = LST_LIST;
gSupportedExpressionArray[LET_PLUS][LST_LIST][LST_STRING] = LST_LIST;
gSupportedExpressionArray[LET_PLUS][LST_LIST][LST_KEY] = LST_LIST;
gSupportedExpressionArray[LET_PLUS][LST_LIST][LST_VECTOR] = LST_LIST;
gSupportedExpressionArray[LET_PLUS][LST_LIST][LST_QUATERNION] = LST_LIST;
gSupportedExpressionArray[LET_PLUS][LST_INTEGER][LST_LIST] = LST_LIST;
gSupportedExpressionArray[LET_PLUS][LST_FLOATINGPOINT][LST_LIST] = LST_LIST;
gSupportedExpressionArray[LET_PLUS][LST_STRING][LST_LIST] = LST_LIST;
gSupportedExpressionArray[LET_PLUS][LST_KEY][LST_LIST] = LST_LIST;
gSupportedExpressionArray[LET_PLUS][LST_VECTOR][LST_LIST] = LST_LIST;
gSupportedExpressionArray[LET_PLUS][LST_QUATERNION][LST_LIST] = LST_LIST;
gSupportedExpressionArray[LET_PLUS][LST_LIST][LST_LIST] = LST_LIST;
// LET_MINUS
gSupportedExpressionArray[LET_MINUS][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_MINUS][LST_FLOATINGPOINT][LST_INTEGER] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_MINUS][LST_INTEGER][LST_FLOATINGPOINT] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_MINUS][LST_FLOATINGPOINT][LST_FLOATINGPOINT] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_MINUS][LST_VECTOR][LST_VECTOR] = LST_VECTOR;
gSupportedExpressionArray[LET_MINUS][LST_QUATERNION][LST_QUATERNION] = LST_QUATERNION;
// LET_TIMES
gSupportedExpressionArray[LET_TIMES][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_TIMES][LST_FLOATINGPOINT][LST_INTEGER] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_TIMES][LST_INTEGER][LST_FLOATINGPOINT] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_TIMES][LST_FLOATINGPOINT][LST_FLOATINGPOINT] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_TIMES][LST_VECTOR][LST_INTEGER] = LST_VECTOR;
gSupportedExpressionArray[LET_TIMES][LST_INTEGER][LST_VECTOR] = LST_VECTOR;
gSupportedExpressionArray[LET_TIMES][LST_VECTOR][LST_FLOATINGPOINT] = LST_VECTOR;
gSupportedExpressionArray[LET_TIMES][LST_FLOATINGPOINT][LST_VECTOR] = LST_VECTOR;
gSupportedExpressionArray[LET_TIMES][LST_VECTOR][LST_VECTOR] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_TIMES][LST_VECTOR][LST_QUATERNION] = LST_VECTOR;
gSupportedExpressionArray[LET_TIMES][LST_QUATERNION][LST_QUATERNION] = LST_QUATERNION;
// LET_DIVIDE
gSupportedExpressionArray[LET_DIVIDE][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_DIVIDE][LST_INTEGER][LST_FLOATINGPOINT] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_DIVIDE][LST_FLOATINGPOINT][LST_INTEGER] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_DIVIDE][LST_FLOATINGPOINT][LST_FLOATINGPOINT] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_DIVIDE][LST_VECTOR][LST_INTEGER] = LST_VECTOR;
gSupportedExpressionArray[LET_DIVIDE][LST_VECTOR][LST_FLOATINGPOINT] = LST_VECTOR;
gSupportedExpressionArray[LET_DIVIDE][LST_VECTOR][LST_QUATERNION] = LST_VECTOR;
gSupportedExpressionArray[LET_DIVIDE][LST_QUATERNION][LST_QUATERNION] = LST_QUATERNION;
// LET_MOD
gSupportedExpressionArray[LET_MOD][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
gSupportedExpressionArray[LET_MOD][LST_VECTOR][LST_VECTOR] = LST_VECTOR;
// LET_BIT_AND
gSupportedExpressionArray[LET_BIT_AND][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
// LET_BIT_OR
gSupportedExpressionArray[LET_BIT_OR][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
// LET_BIT_XOR
gSupportedExpressionArray[LET_BIT_XOR][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
// LET_BOOLEAN_AND
gSupportedExpressionArray[LET_BOOLEAN_AND][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
// LET_BOOLEAN_OR
gSupportedExpressionArray[LET_BOOLEAN_OR][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
// LET_SHIFT_LEFT
gSupportedExpressionArray[LET_SHIFT_LEFT][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
// LET_SHIFT_RIGHT
gSupportedExpressionArray[LET_SHIFT_RIGHT][LST_INTEGER][LST_INTEGER] = LST_INTEGER;
// LET_PARENTHESIS
gSupportedExpressionArray[LET_PARENTHESIS][LST_INTEGER][LST_NULL] = LST_INTEGER;
gSupportedExpressionArray[LET_PARENTHESIS][LST_FLOATINGPOINT][LST_NULL] = LST_INTEGER;
gSupportedExpressionArray[LET_PARENTHESIS][LST_STRING][LST_NULL] = LST_INTEGER;
gSupportedExpressionArray[LET_PARENTHESIS][LST_LIST][LST_NULL] = LST_INTEGER;
// LET_UNARY_MINUS
gSupportedExpressionArray[LET_UNARY_MINUS][LST_INTEGER][LST_NULL] = LST_INTEGER;
gSupportedExpressionArray[LET_UNARY_MINUS][LST_FLOATINGPOINT][LST_NULL] = LST_FLOATINGPOINT;
gSupportedExpressionArray[LET_UNARY_MINUS][LST_VECTOR][LST_NULL] = LST_VECTOR;
gSupportedExpressionArray[LET_UNARY_MINUS][LST_QUATERNION][LST_NULL] = LST_QUATERNION;
// LET_BOOLEAN_NOT
gSupportedExpressionArray[LET_BOOLEAN_NOT][LST_INTEGER][LST_NULL] = LST_INTEGER;
// LET_BIT_NOT
gSupportedExpressionArray[LET_BIT_NOT][LST_INTEGER][LST_NULL] = LST_INTEGER;
// LET_PRE_INCREMENT
gSupportedExpressionArray[LET_PRE_INCREMENT][LST_INTEGER][LST_NULL] = LST_INTEGER;
gSupportedExpressionArray[LET_PRE_INCREMENT][LST_FLOATINGPOINT][LST_NULL] = LST_FLOATINGPOINT;
// LET_PRE_DECREMENT
gSupportedExpressionArray[LET_PRE_DECREMENT][LST_INTEGER][LST_NULL] = LST_INTEGER;
gSupportedExpressionArray[LET_PRE_DECREMENT][LST_FLOATINGPOINT][LST_NULL] = LST_FLOATINGPOINT;
// LET_POST_INCREMENT
gSupportedExpressionArray[LET_POST_INCREMENT][LST_INTEGER][LST_NULL] = LST_INTEGER;
gSupportedExpressionArray[LET_POST_INCREMENT][LST_FLOATINGPOINT][LST_NULL] = LST_FLOATINGPOINT;
// LET_POST_DECREMENT
gSupportedExpressionArray[LET_POST_DECREMENT][LST_INTEGER][LST_NULL] = LST_INTEGER;
gSupportedExpressionArray[LET_POST_DECREMENT][LST_FLOATINGPOINT][LST_NULL] = LST_FLOATINGPOINT;
}
BOOL legal_binary_expression(LSCRIPTType &result, LSCRIPTType left_side, LSCRIPTType right_side, LSCRIPTExpressionType expression)
{
if ( (left_side == LST_UNDEFINED)
||(right_side == LST_UNDEFINED))
{
result = LST_UNDEFINED;
return TRUE;
}
if ( (left_side == LST_NULL)
||(right_side == LST_NULL))
{
result = LST_UNDEFINED;
return FALSE;
}
result = gSupportedExpressionArray[expression][left_side][right_side];
if (result)
return TRUE;
else
{
result = LST_UNDEFINED;
return FALSE;
}
}
BOOL legal_unary_expression(LSCRIPTType &result, LSCRIPTType left_side, LSCRIPTExpressionType expression)
{
if (left_side == LST_UNDEFINED)
{
result = LST_UNDEFINED;
return TRUE;
}
if (left_side == LST_NULL)
{
result = LST_UNDEFINED;
return FALSE;
}
result = gSupportedExpressionArray[expression][left_side][LST_NULL];
if (result)
return TRUE;
else
{
result = LST_UNDEFINED;
return FALSE;
}
}