Custom Robust eval Function: Difference between revisions
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<source lang="mtmacro" line> | <source lang="mtmacro" line> | ||
[ defineFunction( "eval", "evalFunction@this", 1, 0 ) ] | [ defineFunction( "eval", "evalFunction@this", 1, 0 ) ] | ||
</ | </syntaxhighlight> | ||
<hr><br> | <hr><br> | ||
<hr>'''evalFunction''' | <hr>'''evalFunction''' | ||
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} ] | } ] | ||
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[[Category:Cookbook]] | [[Category:Cookbook]] | ||
Revision as of 17:07, 14 March 2023
Note: This function can only be used in a Trusted Macro
This user defined function redefines the standard eval() function, allowing it to be given a number, empty string, or JSON object/array and not throw an exception.
Macros
Place both of these macros on the same library token.
1.3b56+
onCampaignLoad
<source lang="mtmacro" line> [ defineFunction( "eval", "evalFunction@this", 1, 0 ) ] </syntaxhighlight>
evalFunction
<source lang="mtmacro" line> // Error handling [ assert( argCount() >= 1, "eval() - Invalid number of parameters 0,
expected at least 1 parameter.", 0 ) ]
// Initialise variables [ X_Expression_X = arg( argCount()-1 ) ] [ X_CancelEval_X = 0 ] [ X_TypeTest_X = json.type( X_Expression_X ) ]
// Handle all numbers [ if( isNumber( X_Expression_X ) == 1 ), code: {
[ X_CancelEval_X = 1 ]
} ]
// Handle empty strings [ if( X_TypeTest_X == "UNKNOWN" ), code: {
[ if( X_Expression_X == "" ), code:
{
[ X_CancelEval_X = 1 ]
} ]
} ]
// Handle JSON types [ if( X_TypeTest_X == "ARRAY" || X_TypeTest_X == "OBJECT" ), code: {
[ X_CancelEval_X = 1 ]
} ]
// Evaluate or cancel, then return [ if( X_CancelEval_X == 1 ), code: {
[ macro.return = X_Expression_X ]
};{
[ macro.return = oldFunction( X_Expression_X ) ]
} ]
</syntaxhighlight>