application/octet-stream
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1.42 KB
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52 lines
;; Contains everything related to the yield/coroutine system
[def yield-queue [cons "Start of Yield Queue"]]
[def yield [λ [pred expr] "Evaluates EXPR once PRED is true"
[set-cdr! [last-pair yield-queue] [cons [cons pred expr]]]
#t
]]
[def yield-run [let []
[def yield-try [λ [l]
[cond [[eval [car l]] [eval [cdr l]] #t]
[#t #f]
]
]]
[def yield-run-iter [λ [l]
[cond [[nil? l] #t]
[[nil? [cdr l]] #t]
[[yield-try [cadr l]] [set-cdr! l [cddr l]] [yield-run-iter l]]
[#t [yield-run-iter [cdr l]]]
]
]]
[λ [] "Executes pending coroutines if their predicate evaluates to #t"
[yield-run-iter yield-queue]
]
]]
[def timeout [λ [milliseconds] "Returns a function that evaluates to true once MILLISECONDS have passed"
[let [[goal [+ [time/milliseconds] milliseconds]]]
[λ [] [> [time/milliseconds] goal]]
]
]]
[def event-bind [λ [event-name handler] "Binds handler lambda to event-name"
[set! [str->sym event-name] [cons handler [resolve [str->sym event-name]]]]
]]
[def event-clear [λ [event-name] "Clears all event handlers for event-name"
[set! [str->sym event-name] '[]]
]]
[def event-fire-iter [λ [l v] "Iter for event-fire"
[cond [[nil? l] #t]
[#t [apply [car l] v] [event-fire-iter [cdr l] v]]
]
]]
[def event-fire [λ [event-name ...val] "Applies ...val to all event handlers associated with event-name"
[event-fire-iter [resolve [str->sym event-name]] ...val]
]]
