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fe2e3fb9c8
* numbers are no longer auto converted to booleans, use to_boolean or != 0
* booleans are no longer auto converted to numbers, use to_int
* strings will soon no longer be auto converted to numbers, use to_int
Added version information ("since 0.3.7") to documentation
git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@1006 0fc631ac-6414-0410-93d0-97cfa31319b6
42 lines
1.9 KiB
Plaintext
42 lines
1.9 KiB
Plaintext
Default arguments
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DOC_MSE_VERSION: since 0.3.7
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It is possible to declare default arguments for functions using the @@@@ operator.
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> function := { "argument was: " + arg }@(arg:"default")
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If this function is called without the @arg@ argument, then the default value @"default"@ is used instead.
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For example:
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> function() == "argument was: default"
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> function(arg: "something else") == "argument was: something else"
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For determining whether the argument is set only explicit arguments count, not everything in scope, so
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> arg := "something else"
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> function() == "argument was: default"
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Defaults are evaluated at the time the @@@@ operator is evaluated, they will not be overriden later
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> default := "old default"
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> function := { "argument was: " + arg }@(arg: default)
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> default := "new default"
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> function() == "argument was: old default"
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--Rule functions--
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DOC_MSE_VERSION: until 0.3.6
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In earlier versions of MSE some functions were available in a special ''rule form''.
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A call to for example @replace_rule(match:"abc",replace:"xyz")@ is equivalent to @replace@@(match:"abc",replace:"xyz")@ .
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For backwards compatability these functions are still available, but they should not be used for new templates.
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Programming in a ''rule style'' is still very useful.
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A rule is like a normal function with all parameters given, except for the @input@.
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These rules can then be combined using the @+@ operator, for example:
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> # First all "a"s are replaced, then all "b"s.
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> remove_as_and_bs := replace@(match: "a", replace: "") +
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> replace@(match: "b", replace: "")
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>
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> text_with_as_and_bs := "bla bla bla"
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> text_without_as_and_bs := remove_as_and_bs(text_with_as_and_bs)
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<div style="text-align:right;">previous: <a href="functions">← Functions</a> | next: <a href="control_structures">Control structures →</a></div>
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