43 lines
1.1 KiB
Factor
Executable File
43 lines
1.1 KiB
Factor
Executable File
USING: kernel parser lexer strings math namespaces make
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sequences words io arrays quotations debugger accessors
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sequences.private ;
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IN: state-machine
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: STATES:
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! STATES: set-name state1 state2 ... ;
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";" parse-tokens
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[ length ] keep
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unclip suffix
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[ create-in swap 1quotation define ] 2each ; parsing
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TUPLE: state place data ;
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ERROR: missing-state ;
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M: missing-state error.
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drop "Missing state" print ;
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: make-machine ( states -- table quot )
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! quot is ( state string -- output-string )
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[ missing-state ] <array> dup
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[
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[ [ dup [ data>> ] [ place>> ] bi ] dip ] %
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[ swapd bounds-check dispatch ] curry ,
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[ each pick (>>place) swap (>>date) ] %
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] [ ] make [ over make ] curry ;
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: define-machine ( word state-class -- )
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execute make-machine
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[ over ] dip define
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"state-table" set-word-prop ;
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: MACHINE:
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! MACHINE: utf8 unicode-states
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CREATE scan-word define-machine ; parsing
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: S:
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! S: state state-machine definition... ;
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! definition MUST be ( data char -- newdata state )
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scan-word execute scan-word "state-table" word-prop
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parse-definition -rot set-nth ; parsing
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