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{{MacroFunction | {{MacroFunction | ||
|name=assert | |name=assert | ||
|version=1.3b49 | |version=1.3b49 | ||
|description= | |description= | ||
Halts execution and prints a custom error message if a condition is {{false}}. Note that the error message will be displayed in chat even if the command itself is in a [H: ] block. | Halts execution and prints a custom error message if a condition is {{false}}. Note that the error message will be displayed in chat even if the command itself is in a {{code|[H: ]}} block. | ||
|usage= | |usage= | ||
< | <syntaxhighlight lang="mtmacro" line> | ||
assert(condition, message) | assert(condition, message) | ||
</ | </syntaxhighlight> | ||
< | <syntaxhighlight lang="mtmacro" line> | ||
assert(condition, message, prefix) | assert(condition, message, prefix) | ||
</ | </syntaxhighlight> | ||
'''Parameters''' | '''Parameters''' | ||
{{param|condition|The test condition that must evaluate to {{true}} for the macro to continue.}} | {{param|condition|The test condition that must evaluate to {{true}} for the macro to continue.}} | ||
{{param|message|The custom error message that is presented if the macro is halted due to the {{false}} condition.}} | {{param|message|The custom error message that is presented if the macro is halted due to the {{false}} condition.}} | ||
{{param|prefix|Determines if the error message should have the message prefix {{code|"Macro defined error: "}}. Defaults to {{true}}, set to {{false}} if you do not wish your custom error message to have the message prefix.}} | {{param|prefix|Determines if the error message should have the message prefix {{code|"Macro defined error: "}}. Defaults to {{true}}, set to {{false}} if you do not wish your custom error message to have the message prefix.}} | ||
|examples= | |||
Checks to see if a player is a GM, and if they are not halts execution of the macro and displays output. | |||
<syntaxhighlight lang="mtmacro" line> | |||
[h: assert(isGM(),"This macro is for GM use only.",0)] | |||
</syntaxhighlight> | |||
Chat output (if player is not GM): {{code|This macro is for GM use only.}} | |||
Halts execution of the macro if {{code|var}} is a number. This is useful for making sure the variables you work with are the variable type you expect. | |||
<syntaxhighlight lang="mtmacro" line> | |||
[h: assert(! isNumber(var), "The variable is a number.",1)] | |||
</syntaxhighlight> | |||
Chat output (if {{code|var}} is a number): {{code|Macro defined error: The variable is a number.}} | |||
Bear in mind, {{code|isNumber(var)}} returns {{true}} when var is a number, but assert continues when condition is {{true}}. Using {{code|! isNumber(var)}} inverts the boolean value. | |||
===Usage Notes=== | |||
When aborting a macro called from another macro (for example, a library token), all macros are aborted, not just the one executing. | |||
Since 1.5.0 you can change that behaviour by using macro.catchAssert. | |||
|also= | |also= | ||
{{func|abort}} | {{ func|isGM}} | ||
{{ func|isNumber}} | |||
{{ func|abort}} | |||
[[ macro.catchAssert|macro.catchAssert]] | |||
|changes= | |changes= | ||
{{change|1.3b51|Added {{code|prefix}} parameter option.}} | {{change|1.3b51|Added {{code|prefix}} parameter option.}} | ||
{{change|1.5.0|catch an assert with macro.catchAssert}} | |||
}} | }} | ||
[[Category:Miscellaneous Function]] | [[Category:Miscellaneous Function]] | ||
Latest revision as of 20:07, 14 March 2023
assert() Function
• Introduced in version 1.3b49
Halts execution and prints a custom error message if a condition is
false(0). Note that the error message will be displayed in chat even if the command itself is in a [H: ] block.Usage
assert(condition, message)assert(condition, message, prefix)Parameters
condition- The test condition that must evaluate totrue(1) for the macro to continue.message- The custom error message that is presented if the macro is halted due to thefalse(0) condition.prefix- Determines if the error message should have the message prefix"Macro defined error: ". Defaults totrue(1), set tofalse(0) if you do not wish your custom error message to have the message prefix.
Examples
Checks to see if a player is a GM, and if they are not halts execution of the macro and displays output.
[h: assert(isGM(),"This macro is for GM use only.",0)]Chat output (if player is not GM): This macro is for GM use only.
Halts execution of the macro if var is a number. This is useful for making sure the variables you work with are the variable type you expect.
[h: assert(! isNumber(var), "The variable is a number.",1)]Chat output (if var is a number): Macro defined error: The variable is a number.
Bear in mind, isNumber(var) returns true(1) when var is a number, but assert continues when condition is true(1). Using ! isNumber(var) inverts the boolean value.
Usage Notes
When aborting a macro called from another macro (for example, a library token), all macros are aborted, not just the one executing.
Since 1.5.0 you can change that behaviour by using macro.catchAssert.See Also
Version Changes
- 1.3b51 - Added
prefixparameter option. - 1.5.0 - catch an assert with macro.catchAssert