268 lines
9.2 KiB
Factor
268 lines
9.2 KiB
Factor
! Copyright (C) 2009 Doug Coleman.
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! See http://factorcode.org/license.txt for BSD license.
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USING: classes.tuple help.markup help.syntax kernel math
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quotations sequences stack-checker arrays ;
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IN: combinators.smart
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HELP: input<sequence
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{ $values
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{ "seq" sequence }
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{ "quot" quotation }
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}
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{ $description "Infers the number of inputs, " { $snippet "n" } ", to " { $snippet "quot" } " and calls the " { $snippet "quot" } " with the first " { $snippet "n" } " values from a sequence." }
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{ $examples
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{ $example
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"USING: combinators.smart math prettyprint ;"
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"{ 1 2 3 } [ + + ] input<sequence ."
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"6"
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}
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} ;
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HELP: output>array
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{ $values
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{ "quot" quotation }
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{ "array" array }
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}
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{ $description "Infers the number of outputs from the quotation and constructs an array from those outputs." }
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{ $examples
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{ $example
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"USING: combinators combinators.smart math prettyprint ;
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9 [
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{ [ 1 - ] [ 1 + ] [ sq ] } cleave
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] output>array ."
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"{ 8 10 81 }"
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}
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} ;
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HELP: output>sequence
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{ $values
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{ "quot" quotation } { "exemplar" "an exemplar" }
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{ "seq" sequence }
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}
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{ $description "Infers the number of outputs from the quotation and constructs a new sequence from those objects of the same type as the exemplar." }
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{ $examples
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{ $example
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"USING: combinators.smart kernel math prettyprint ;"
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"4 [ [ 1 + ] [ 2 + ] [ 3 + ] tri ] V{ } output>sequence ."
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"V{ 5 6 7 }"
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}
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} ;
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HELP: reduce-outputs
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{ $values
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{ "quot" quotation } { "operation" quotation }
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}
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{ $description "Infers the number of outputs from " { $snippet "quot" } " and reduces them using " { $snippet "operation" } ". The identity for the " { $link reduce } " operation is the first output." }
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{ $examples
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{ $example
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"USING: combinators.smart kernel math prettyprint ;"
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"3 [ [ 4 * ] [ 4 / ] [ 4 - ] tri ] [ * ] reduce-outputs ."
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"-9"
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}
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} ;
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HELP: sum-outputs
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{ $values
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{ "quot" quotation }
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{ "n" integer }
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}
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{ $description "Infers the number of outputs from " { $snippet "quot" } " and returns their sum." }
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{ $examples
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{ $example
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"USING: combinators.smart kernel math prettyprint ;"
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"10 [ [ 1 - ] [ 1 + ] bi ] sum-outputs ."
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"20"
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}
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} ;
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HELP: append-outputs
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{ $values
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{ "quot" quotation }
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{ "seq" sequence }
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}
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{ $description "Infers the number of outputs from " { $snippet "quot" } " and returns a sequence of the outputs appended." }
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{ $examples
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{ $example
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"USING: combinators.smart prettyprint ;"
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"[ { 1 2 } { \"A\" \"b\" } ] append-outputs ."
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"{ 1 2 \"A\" \"b\" }"
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}
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} ;
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HELP: append-outputs-as
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{ $values
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{ "quot" quotation } { "exemplar" sequence }
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{ "seq" sequence }
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}
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{ $description "Infers the number of outputs from " { $snippet "quot" } " and returns a sequence of type " { $snippet "exemplar" } " of the outputs appended." }
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{ $examples
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{ $example
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"USING: combinators.smart prettyprint ;"
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"[ { 1 2 } { \"A\" \"b\" } ] V{ } append-outputs-as ."
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"V{ 1 2 \"A\" \"b\" }"
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}
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} ;
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{ append-outputs append-outputs-as } related-words
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HELP: drop-outputs
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{ $values { "quot" quotation } }
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{ $description "Calls a quotation and drops any values it leaves on the stack." } ;
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HELP: keep-inputs
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{ $values { "quot" quotation } }
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{ $description "Calls a quotation and preserves any values it takes off the stack." } ;
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{ drop-outputs keep-inputs } related-words
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HELP: dropping
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{ $values
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{ "quot" quotation }
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{ "quot'" quotation }
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}
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{ $description "Outputs a quotation that, when called, will have the effect of dropping the number of inputs to the original quotation." }
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{ $examples
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{ $example
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"""USING: combinators.smart math prettyprint ;
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[ + + ] dropping ."""
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"""[ 3 ndrop ]"""
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}
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} ;
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HELP: input<sequence-unsafe
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{ $values
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{ "seq" sequence }
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{ "quot" quotation }
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}
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{ $description "An unsafe version of " { $link input<sequence-unsafe } "." } ;
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HELP: map-reduce-outputs
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{ $values
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{ "quot" quotation } { "mapper" quotation } { "reducer" quotation }
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}
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{ $description "Infers the number of outputs from " { $snippet "quot" } " and, treating those outputs as a sequence, calls " { $link map-reduce } " on them." }
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{ $examples
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{ $example
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"""USING: math combinators.smart prettyprint ;
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[ 1 2 3 ] [ sq ] [ + ] map-reduce-outputs ."""
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"14"
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}
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} ;
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HELP: nullary
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{ $values
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{ "quot" quotation }
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}
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{ $description "Infers the number of inputs to a quotation and drops them from the stack." }
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{ $examples
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{ $code
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"""USING: combinators.smart kernel math ;
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1 2 [ + ] nullary"""
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}
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} ;
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HELP: preserving
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{ $values
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{ "quot" quotation }
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}
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{ $description "Calls a quotation and leaves any consumed inputs on the stack beneath the quotation's outputs." }
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{ $examples
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{ $example
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"""USING: combinators.smart kernel math prettyprint ;
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1 2 [ + ] preserving [ . ] tri@"""
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"""1
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2
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3"""
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}
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} ;
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HELP: smart-apply
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{ $values
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{ "quot" quotation } { "n" integer }
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}
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{ $description "Applies a quotation to the datastack " { $snippet "n" } " times, starting lower on the stack and working up in increments of the number of inferred inputs to the quotation." }
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{ $examples
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{ $example
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"""USING: combinators.smart prettyprint math kernel ;
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1 2 3 4 [ + ] 2 smart-apply [ . ] bi@"""
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"""3
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7"""
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}
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} ;
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HELP: smart-if
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{ $values
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{ "pred" quotation } { "true" quotation } { "false" quotation }
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}
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{ $description "A version of " { $link if } " that takes three quotations, where the first quotation is a predicate that preserves any inputs it consumes." } ;
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HELP: smart-if*
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{ $values
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{ "pred" quotation } { "true" quotation } { "false" quotation }
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}
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{ $description "A version of " { $link if } " that takes three quotations, where the first quotation is a predicate that preserves any inputs it consumes, the second is the " { $snippet "true" } " branch, and the third is the " { $snippet "false" } " branch. If the " { $snippet "true" } " branch is taken, the values are left on the stack and the quotation is called. If the " { $snippet "false" } " branch is taken, the number of inputs inferred from predicate quotation is dropped and the quotation is called." } ;
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HELP: smart-unless
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{ $values
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{ "pred" quotation } { "false" quotation }
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}
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{ $description "A version of " { $link unless } " that takes two quotations, where the first quotation is a predicate that preserves any inputs it consumes and the second is the " { $snippet "false" } " branch." } ;
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HELP: smart-unless*
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{ $values
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{ "pred" quotation } { "false" quotation }
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}
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{ $description "A version of " { $link unless } " that takes two quotations, where the first quotation is a predicate that preserves any inputs it consumes and the second is the " { $snippet "false" } " branch. If the " { $snippet "true" } " branch is taken, the values are left on the stack. If the " { $snippet "false" } " branch is taken, the number of inputs inferred from predicate quotation is dropped and the quotation is called." } ;
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HELP: smart-when
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{ $values
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{ "pred" quotation } { "true" quotation }
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}
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{ $description "A version of " { $link when } " that takes two quotations, where the first quotation is a predicate that preserves any inputs it consumes and the second is the " { $snippet "true" } " branch." } ;
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HELP: smart-when*
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{ $values
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{ "pred" quotation } { "true" quotation }
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}
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{ $description "A version of " { $link when } " that takes two quotations, where the first quotation is a predicate that preserves any inputs it consumes and the second is the " { $snippet "true" } " branch. If the " { $snippet "true" } " branch is taken, the values are left on the stack and the quotation is called. If the " { $snippet "false" } " branch is taken, the number of inputs inferred from predicate quotation is dropped." } ;
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ARTICLE: "combinators.smart" "Smart combinators"
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"A " { $emphasis "smart combinator" } " is a macro which reflects on the stack effect of an input quotation. The " { $vocab-link "combinators.smart" } " vocabulary implements a few simple smart combinators which look at the static stack effects of input quotations and generate code which produces or consumes the relevant number of stack values." $nl
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"Take all input values from a sequence:"
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{ $subsections
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input<sequence
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input<sequence-unsafe
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}
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"Store all output values to a sequence:"
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{ $subsections
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output>sequence
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output>array
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}
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"Reducing the set of output values:"
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{ $subsections
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reduce-outputs
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map-reduce-outputs
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}
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"Applying a quotation to groups of elements on the stack:"
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{ $subsections smart-apply }
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"Summing output values:"
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{ $subsections sum-outputs }
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"Concatenating output values:"
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{ $subsections
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append-outputs
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append-outputs-as
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}
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"Drop the outputs after calling a quotation:"
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{ $subsections drop-outputs }
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"Cause a quotation to act as a no-op and drop the inputs:"
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{ $subsection nullary }
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"Preserve the inputs below or above the outputs of the quotation:"
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{ $subsections preserving keep-inputs }
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"Versions of if that infer how many inputs to keep from the predicate quotation:"
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{ $subsections smart-if smart-when smart-unless }
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"Versions of if* that infer how many inputs to keep from the predicate quotation:"
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{ $subsections smart-if* smart-when* smart-unless* }
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"New smart combinators can be created by defining " { $link "macros" } " which call " { $link infer } "." ;
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ABOUT: "combinators.smart"
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