159 lines
4.5 KiB
Factor
159 lines
4.5 KiB
Factor
! Copyright (C) 2005, 2006 Daniel Ehrenberg
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! See http://factorcode.org/license.txt for BSD license.
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USING: io io.streams.string kernel math namespaces sequences
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strings circular prettyprint debugger ascii sbufs fry summary
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accessors sequences.lib ;
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IN: state-parser
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! * Basic underlying words
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! Code stored in stdio
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! Spot is composite so it won't be lost in sub-scopes
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TUPLE: spot char line column next ;
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C: <spot> spot
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: get-char ( -- char ) spot get char>> ;
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: set-char ( char -- ) spot get swap >>char drop ;
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: get-line ( -- line ) spot get line>> ;
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: set-line ( line -- ) spot get swap >>line drop ;
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: get-column ( -- column ) spot get column>> ;
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: set-column ( column -- ) spot get swap >>column drop ;
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: get-next ( -- char ) spot get next>> ;
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: set-next ( char -- ) spot get swap >>next drop ;
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! * Errors
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TUPLE: parsing-error line column ;
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: parsing-error ( class -- obj )
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new
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get-line >>line
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get-column >>column ;
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M: parsing-error summary ( obj -- str )
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[
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"Parsing error" print
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"Line: " write dup line>> .
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"Column: " write column>> .
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] with-string-writer ;
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TUPLE: expected < parsing-error should-be was ;
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: expected ( should-be was -- * )
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\ expected parsing-error
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swap >>was
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swap >>should-be throw ;
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M: expected summary ( obj -- str )
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[
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dup call-next-method write
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"Token expected: " write dup should-be>> print
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"Token present: " write was>> print
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] with-string-writer ;
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TUPLE: unexpected-end < parsing-error ;
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: unexpected-end ( -- * ) \ unexpected-end parsing-error throw ;
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M: unexpected-end summary ( obj -- str )
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[
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call-next-method write
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"File unexpectedly ended." print
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] with-string-writer ;
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TUPLE: missing-close < parsing-error ;
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: missing-close ( -- * ) \ missing-close parsing-error throw ;
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M: missing-close summary ( obj -- str )
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[
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call-next-method write
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"Missing closing token." print
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] with-string-writer ;
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SYMBOL: prolog-data
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! * Basic utility words
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: record ( char -- )
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CHAR: \n =
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[ 0 get-line 1+ set-line ] [ get-column 1+ ] if
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set-column ;
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! (next) normalizes \r\n and \r
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: (next) ( -- char )
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get-next read1
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2dup swap CHAR: \r = [
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CHAR: \n =
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[ nip read1 ] [ nip CHAR: \n swap ] if
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] [ drop ] if
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set-next dup set-char ;
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: next ( -- )
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#! Increment spot.
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get-char [ unexpected-end ] unless (next) record ;
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: next* ( -- )
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get-char [ (next) record ] when ;
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: skip-until ( quot: ( -- ? ) -- )
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get-char [
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[ call ] keep swap [ drop ] [
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next skip-until
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] if
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] [ drop ] if ; inline recursive
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: take-until ( quot -- string )
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#! Take the substring of a string starting at spot
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#! from code until the quotation given is true and
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#! advance spot to after the substring.
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10 <sbuf> [
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'[ @ [ t ] [ get-char , push f ] if ] skip-until
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] keep >string ; inline
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: take-rest ( -- string )
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[ f ] take-until ;
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: take-char ( ch -- string )
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[ dup get-char = ] take-until nip ;
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TUPLE: not-enough-characters < parsing-error ;
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: not-enough-characters ( -- * )
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\ not-enough-characters parsing-error throw ;
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M: not-enough-characters summary ( obj -- str )
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[
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call-next-method write
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"Not enough characters" print
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] with-string-writer ;
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: take ( n -- string )
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[ 1- ] [ <sbuf> ] bi [
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'[ drop get-char [ next , push f ] [ t ] if* ] attempt-each drop
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] keep get-char [ over push ] when* >string ;
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: pass-blank ( -- )
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#! Advance code past any whitespace, including newlines
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[ get-char blank? not ] skip-until ;
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: string-matches? ( string circular -- ? )
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get-char over push-circular
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sequence= ;
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: take-string ( match -- string )
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dup length <circular-string>
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[ 2dup string-matches? ] take-until nip
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dup length rot length 1- - head
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get-char [ missing-close ] unless next ;
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: expect ( ch -- )
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get-char 2dup = [ 2drop ] [
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>r 1string r> 1string expected
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] if next ;
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: expect-string ( string -- )
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dup [ get-char next ] replicate 2dup =
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[ 2drop ] [ expected ] if ;
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: init-parser ( -- )
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0 1 0 f <spot> spot set
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read1 set-next next ;
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: state-parse ( stream quot -- )
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! with-input-stream implicitly creates a new scope which we use
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swap [ init-parser call ] with-input-stream ; inline
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: string-parse ( input quot -- )
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>r <string-reader> r> state-parse ; inline
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