161 lines
3.3 KiB
Factor
Executable File
161 lines
3.3 KiB
Factor
Executable File
! Copyright (C) 2006 Chris Double.
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! See http://factorcode.org/license.txt for BSD license.
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USING: kernel parser-combinators namespaces sequences promises strings
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assocs math math.parser math.vectors math.functions
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lazy-lists hashtables ascii ;
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IN: json.reader
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! Grammar for JSON from RFC 4627
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: [<&>] ( quot -- quot )
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{ } make unclip [ <&> ] reduce ;
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: [<|>] ( quot -- quot )
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{ } make unclip [ <|> ] reduce ;
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LAZY: 'ws' ( -- parser )
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" " token
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"\n" token <|>
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"\r" token <|>
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"\t" token <|>
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"" token <|> ;
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LAZY: spaced ( parser -- parser )
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'ws' swap &> 'ws' <& ;
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LAZY: 'begin-array' ( -- parser )
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"[" token spaced ;
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LAZY: 'begin-object' ( -- parser )
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"{" token spaced ;
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LAZY: 'end-array' ( -- parser )
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"]" token spaced ;
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LAZY: 'end-object' ( -- parser )
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"}" token spaced ;
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LAZY: 'name-separator' ( -- parser )
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":" token spaced ;
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LAZY: 'value-separator' ( -- parser )
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"," token spaced ;
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LAZY: 'false' ( -- parser )
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"false" token ;
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LAZY: 'null' ( -- parser )
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"null" token ;
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LAZY: 'true' ( -- parser )
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"true" token ;
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LAZY: 'quot' ( -- parser )
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"\"" token ;
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LAZY: 'string' ( -- parser )
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'quot'
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[
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[ quotable? ] keep
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[ CHAR: \\ = or ] keep
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CHAR: " = not and
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] satisfy <*> &>
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'quot' <& [ >string ] <@ ;
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DEFER: 'value'
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LAZY: 'member' ( -- parser )
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'string'
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'name-separator' <&
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'value' <&> ;
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USE: prettyprint
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LAZY: 'object' ( -- parser )
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'begin-object'
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'member' 'value-separator' list-of &>
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'end-object' <& [ >hashtable ] <@ ;
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LAZY: 'array' ( -- parser )
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'begin-array'
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'value' 'value-separator' list-of &>
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'end-array' <& ;
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LAZY: 'minus' ( -- parser )
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"-" token ;
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LAZY: 'plus' ( -- parser )
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"+" token ;
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LAZY: 'zero' ( -- parser )
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"0" token [ drop 0 ] <@ ;
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LAZY: 'decimal-point' ( -- parser )
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"." token ;
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LAZY: 'digit1-9' ( -- parser )
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[
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dup integer? [
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CHAR: 1 CHAR: 9 between?
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] [
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drop f
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] if
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] satisfy [ digit> ] <@ ;
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LAZY: 'digit0-9' ( -- parser )
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[ digit? ] satisfy [ digit> ] <@ ;
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: decimal>integer ( seq -- num ) 10 digits>integer ;
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LAZY: 'int' ( -- parser )
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'zero'
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'digit1-9' 'digit0-9' <*> <&:> [ decimal>integer ] <@ <|> ;
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LAZY: 'e' ( -- parser )
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"e" token "E" token <|> ;
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: sign-number ( pair -- number )
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#! Pair is { minus? num }
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#! Convert the json number value to a factor number
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dup second swap first [ -1 * ] when ;
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LAZY: 'exp' ( -- parser )
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'e'
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'minus' 'plus' <|> <?> &>
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'digit0-9' <+> [ decimal>integer ] <@ <&> [ sign-number ] <@ ;
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: sequence>frac ( seq -- num )
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#! { 1 2 3 } => 0.123
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reverse 0 [ swap 10 / + ] reduce 10 / >float ;
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LAZY: 'frac' ( -- parser )
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'decimal-point' 'digit0-9' <+> &> [ sequence>frac ] <@ ;
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: raise-to-power ( pair -- num )
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#! Pair is { num exp }.
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#! Multiply 'num' by 10^exp
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dup second dup [ 10 swap first ^ swap first * ] [ drop first ] if ;
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LAZY: 'number' ( -- parser )
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'minus' <?>
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[ 'int' , 'frac' 0 succeed <|> , ] [<&>] [ sum ] <@
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'exp' <?> <&> [ raise-to-power ] <@ <&> [ sign-number ] <@ ;
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LAZY: 'value' ( -- parser )
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[
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'false' ,
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'null' ,
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'true' ,
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'string' ,
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'object' ,
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'array' ,
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'number' ,
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] [<|>] ;
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: json> ( string -- object )
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#! Parse a json formatted string to a factor object
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'value' parse dup nil? [
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"Could not parse json" throw
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] [
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car parse-result-parsed
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] if ;
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