48 lines
2.0 KiB
Factor
48 lines
2.0 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: help.markup help.syntax kernel math io ;
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IN: io.streams.limited
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HELP: <limited-stream>
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{ $values
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{ "stream" "an input stream" } { "limit" integer }
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{ "stream'" "an input stream" }
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}
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{ $description "Constructs a new " { $link limited-stream } " from an existing stream. User code should use " { $link limit-stream } " or " { $link limited-input } "." } ;
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HELP: limit-stream
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{ $values
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{ "stream" "an input stream" } { "limit" integer }
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{ "stream'" "a stream" }
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}
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{ $description "Changes a decoder's stream to be a limited stream, or wraps " { $snippet "stream" } " in a " { $link limited-stream } "." }
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{ $examples
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"Limiting a longer stream to length three:"
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{ $example
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"USING: accessors continuations io io.streams.limited"
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"io.streams.string kernel prettyprint ;"
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"\"123456\" <string-reader> 3 limit-stream"
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"100 swap stream-read ."
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"\"123\""
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}
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} ;
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HELP: limited-stream
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{ $values
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{ "value" "a limited-stream class" }
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}
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{ $description "Limited streams wrap other streams, changing their behavior to throw an exception or return " { $link f } " upon exhaustion." } ;
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HELP: limited-input
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{ $values { "limit" integer } }
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{ $description "Wraps the current " { $link input-stream } " in a " { $link limited-stream } "." } ;
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ARTICLE: "io.streams.limited" "Limited input streams"
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"The " { $vocab-link "io.streams.limited" } " vocabulary wraps a stream to behave as if it had only a limited number of bytes. Limiting a seekable stream creates a window of bytes that supports seeking and re-reading of bytes in that window. If it is desirable for a stream to throw an exception upon exhaustion, use the " { $vocab-link "io.streams.throwing" } " vocabulary in conjunction with this one." $nl
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"Wrap a stream in a limited stream:"
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{ $subsections limited-stream }
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"Wrap the current " { $link input-stream } " in a limited stream:"
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{ $subsections limited-input } ;
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ABOUT: "io.streams.limited"
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