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(.module:
[library
[lux #*
[control
["." exception (#+ exception:)]]
[data
[text
["%" format (#+ format)]]]
[macro (#+ with_gensyms)
[syntax (#+ syntax:)]
["." code]]
[math
[number
["i" int]]]]])
(template [<name>]
[(exception: (<name> {condition Code})
(exception.report
["Condition" (%.code condition)]))]
[pre_condition_failed]
[post_condition_failed]
)
(def: (assert! message test)
(-> Text Bit [])
(if test
[]
(error! message)))
(syntax: #export (pre test expr)
{#.doc (doc "Pre-conditions."
"Given a test and an expression to run, only runs the expression if the test passes."
"Otherwise, an error is raised."
(pre (i.= +4 (i.+ +2 +2))
(foo +123 +456 +789)))}
(wrap (list (` (exec ((~! ..assert!) (~ (code.text (exception.construct ..pre_condition_failed test)))
(~ test))
(~ expr))))))
(syntax: #export (post test expr)
{#.doc (doc "Post-conditions."
"Given a predicate and an expression to run, evaluates the expression and then tests the output with the predicate."
"If the predicate returns #1, returns the value of the expression."
"Otherwise, an error is raised."
(post i.even?
(i.+ +2 +2)))}
(with_gensyms [g!output]
(wrap (list (` (let [(~ g!output) (~ expr)]
(exec ((~! ..assert!) (~ (code.text (exception.construct ..post_condition_failed test)))
((~ test) (~ g!output)))
(~ g!output))))))))
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