factor/basis/peg/peg.factor

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! Copyright (C) 2007, 2008 Chris Double.
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! See http://factorcode.org/license.txt for BSD license.
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USING: accessors arrays assocs classes combinators
combinators.short-circuit compiler.units effects.parser fry
generalizations kernel locals make math math.order namespaces
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quotations sequences sets splitting unicode vectors
vocabs.loader words ;
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IN: peg
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TUPLE: parse-result remaining ast ;
TUPLE: parse-error position got messages ;
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TUPLE: parser peg compiled id ;
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M: parser equal? { [ [ class-of ] same? ] [ [ id>> ] same? ] } 2&& ;
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M: parser hashcode* id>> hashcode* ;
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C: <parse-result> parse-result
C: <parse-error> parse-error
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SYMBOL: error-stack
: merge-overlapping-errors ( a b -- c )
dupd [ messages>> ] bi@ union [ [ position>> ] [ got>> ] bi ] dip
<parse-error> ;
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: (merge-errors) ( a b -- c )
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{
{ [ over position>> not ] [ nip ] }
{ [ dup position>> not ] [ drop ] }
[
2dup [ position>> ] compare {
{ +lt+ [ nip ] }
{ +gt+ [ drop ] }
{ +eq+ [ merge-overlapping-errors ] }
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} case
]
} cond ;
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: merge-errors ( -- )
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error-stack get dup length 1 > [
[ pop ] [ pop swap (merge-errors) ] [ ] tri push
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] [
drop
] if ;
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: add-error ( position got message -- )
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<parse-error> error-stack get push ;
SYMBOL: ignore
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: ignore? ( obj -- ? )
ignore = ;
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: packrat ( id -- cache )
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! The packrat cache is a mapping of parser-id->cache.
! For each parser it maps to a cache holding a mapping
! of position->result. The packrat cache therefore keeps
! track of all parses that have occurred at each position
! of the input string and the results obtained from that
! parser.
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\ packrat get [ drop H{ } clone ] cache ;
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SYMBOL: pos
SYMBOL: input
SYMBOL: fail
SYMBOL: lrstack
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: heads ( -- cache )
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! A mapping from position->peg-head. It maps a
! position in the input string being parsed to
! the head of the left recursion which is currently
! being grown. It is 'f' at any position where
! left recursion growth is not underway.
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\ heads get ;
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: failed? ( obj -- ? )
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fail = ;
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: peg-cache ( -- cache )
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! Holds a hashtable mapping a peg tuple to
! the parser tuple for that peg. The parser tuple
! holds a unique id and the compiled form of that peg.
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\ peg-cache get-global [
H{ } clone dup \ peg-cache set-global
] unless* ;
: reset-pegs ( -- )
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H{ } clone \ peg-cache set-global ;
reset-pegs
! An entry in the table of memoized parse results
! ast = an AST produced from the parse
! or the symbol 'fail'
! or a left-recursion object
! pos = the position in the input string of this entry
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TUPLE: memo-entry ans pos ;
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TUPLE: left-recursion seed rule-id head next ;
TUPLE: peg-head rule-id involved-set eval-set ;
: rule-id ( word -- id )
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! A rule is the parser compiled down to a word. It has
! a "peg-id" property containing the id of the original parser.
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"peg-id" word-prop ;
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: input-slice ( -- slice )
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! Return a slice of the input from the current parse position
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input get pos get tail-slice ;
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: input-from ( input -- n )
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! Return the index from the original string that the
! input slice is based on.
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dup slice? [ from>> ] [ drop 0 ] if ;
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: process-rule-result ( p result -- result )
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[
nip [ ast>> ] [ remaining>> ] bi input-from pos namespaces:set
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] [
pos namespaces:set fail
] if* ;
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: eval-rule ( rule -- ast )
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! Evaluate a rule, return an ast resulting from it.
! Return fail if the rule failed. The rule has
! stack effect ( -- parse-result )
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pos get swap execute( -- parse-result ) process-rule-result ; inline
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: memo ( pos id -- memo-entry )
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! Return the result from the memo cache.
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packrat at ;
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: set-memo ( memo-entry pos id -- )
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! Store an entry in the cache
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packrat set-at ;
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: update-m ( ast m -- )
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swap >>ans pos get >>pos drop ;
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: stop-growth? ( ast m -- ? )
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[ failed? pos get ] dip pos>> <= or ;
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: setup-growth ( h p -- )
pos namespaces:set dup involved-set>> clone >>eval-set drop ;
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: (grow-lr) ( h p r: ( -- result ) m -- )
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[ [ setup-growth ] 2keep ] 2dip
[ dup eval-rule ] dip swap
dup pick stop-growth? [
5drop
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] [
over update-m
(grow-lr)
] if ; inline recursive
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: grow-lr ( h p r m -- ast )
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[ [ heads set-at ] 2keep ] 2dip
pick over [ (grow-lr) ] 2dip
swap heads delete-at
dup pos>> pos namespaces:set ans>>
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; inline
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:: (setup-lr) ( l s -- )
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s [
s left-recursion? [ s throw ] unless
s head>> l head>> eq? [
l head>> s head<<
l head>> [ s rule-id>> suffix ] change-involved-set drop
l s next>> (setup-lr)
] unless
] when ;
:: setup-lr ( r l -- )
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l head>> [
r rule-id V{ } clone V{ } clone peg-head boa l head<<
] unless
l lrstack get (setup-lr) ;
:: lr-answer ( r p m -- ast )
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m ans>> head>> :> h
h rule-id>> r rule-id eq? [
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m ans>> seed>> m ans<<
m ans>> failed? [
fail
] [
h p r m grow-lr
] if
] [
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m ans>> seed>>
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] if ; inline
:: recall ( r p -- memo-entry )
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p r rule-id memo :> m
p heads at :> h
h [
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m r rule-id h involved-set>> h rule-id>> suffix member? not and [
fail p memo-entry boa
] [
r rule-id h eval-set>> member? [
h [ r rule-id swap remove ] change-eval-set drop
r eval-rule
m update-m
m
] [
m
] if
] if
] [
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m
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] if ; inline
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:: apply-non-memo-rule ( r p -- ast )
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fail r rule-id f lrstack get left-recursion boa :> lr
lr lrstack namespaces:set lr p memo-entry boa dup p r rule-id set-memo :> m
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r eval-rule :> ans
lrstack get next>> lrstack namespaces:set
pos get m pos<<
lr head>> [
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m ans>> left-recursion? [
ans lr seed<<
r p m lr-answer
] [ ans ] if
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] [
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ans m ans<<
ans
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] if ; inline
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: apply-memo-rule ( r m -- ast )
[ ans>> ] [ pos>> ] bi pos namespaces:set
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dup left-recursion? [
[ setup-lr ] keep seed>>
] [
nip
] if ;
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: apply-rule ( r p -- ast )
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2dup recall [
nip apply-memo-rule
] [
apply-non-memo-rule
] if* ; inline
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: with-packrat ( input quot -- result )
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! Run the quotation with a packrat cache active.
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[
swap input ,,
0 pos ,,
f lrstack ,,
V{ } clone error-stack ,,
H{ } clone \ heads ,,
H{ } clone \ packrat ,,
] H{ } make swap with-variables ; inline
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GENERIC: (compile) ( peg -- quot )
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: process-parser-result ( result -- result )
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dup failed? [
drop f
] [
input-slice swap <parse-result>
] if ;
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: execute-parser ( word -- result )
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pos get apply-rule process-parser-result ;
: preset-parser-word ( parser -- word parser )
gensym swap over >>compiled ;
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: define-parser-word ( word parser -- )
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! Return the body of the word that is the compiled version
! of the parser.
[ peg>> (compile) ( -- result ) define-declared ]
[ id>> "peg-id" set-word-prop ] 2bi ;
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: compile-parser ( parser -- word )
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! Look to see if the given parser has been compiled.
! If not, compile it to a temporary word, cache it,
! and return it. Otherwise return the existing one.
! Circular parsers are supported by getting the word
! name and storing it in the cache, before compiling,
! so it is picked up when re-entered.
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dup compiled>> [
nip
] [
preset-parser-word dupd define-parser-word
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] if* ;
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: compile-parser-quot ( parser -- quot )
compile-parser '[ _ execute-parser ] ;
: compile-parsers-quots ( parsers -- quots )
[ compile-parser-quot ] map dup rest-slice
[ '[ @ merge-errors ] ] map! drop ;
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SYMBOL: delayed
: fixup-delayed ( -- )
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! Work through all delayed parsers and recompile their
! words to have the correct bodies.
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delayed get [
call( -- parser ) compile-parser-quot ( -- result ) define-declared
] assoc-each ;
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: compile ( parser -- word )
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[
H{ } clone delayed [
compile-parser-quot ( -- result ) define-temp fixup-delayed
] with-variable
] with-compilation-unit ;
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: compiled-parse ( state word -- result )
swap [
execute( -- result )
[ error-stack get ?first [ throw ]
[ pos get input get f <parse-error> throw ] if* ] unless*
] with-packrat ;
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: (parse) ( input parser -- result )
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dup word? [ compile ] unless compiled-parse ;
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: parse ( input parser -- ast )
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(parse) ast>> ;
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<PRIVATE
: next-id ( -- n )
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! Return the next unique id for a parser
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\ next-id counter ;
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: wrap-peg ( peg -- parser )
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! Wrap a parser tuple around the peg object.
! Look for an existing parser tuple for that
! peg object.
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peg-cache [ f next-id parser boa ] cache ;
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TUPLE: token-parser symbol ;
: parse-token ( input string -- result )
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! Parse the string, returning a parse result
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[ ?head-slice ] keep swap [
<parse-result>
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] [
[ seq>> pos get swap ] dip "'" "'" surround 1vector add-error f
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] if ;
M: token-parser (compile)
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symbol>> '[ input-slice _ parse-token ] ;
TUPLE: satisfy-parser quot ;
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:: parse-satisfy ( input quot -- result/f )
input [ f ] [
unclip-slice dup quot call [
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<parse-result>
] [
2drop f
] if
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] if-empty ; inline
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M: satisfy-parser (compile)
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quot>> '[ input-slice _ parse-satisfy ] ;
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TUPLE: range-parser min max ;
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:: parse-range ( input min max -- result/f )
input [ f ] [
dup first min max between? [
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unclip-slice <parse-result>
] [
drop f
] if
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] if-empty ;
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M: range-parser (compile)
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[ min>> ] [ max>> ] bi '[ input-slice _ _ parse-range ] ;
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TUPLE: seq-parser parsers ;
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: calc-seq-result ( prev-result current-result -- next-result )
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[
[ remaining>> >>remaining ] [ ast>> ] bi
dup ignore? [ drop ] [ over ast>> push ] if
] [
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drop f
] if* ;
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: parse-seq-element ( result quot -- result )
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'[ @ calc-seq-result ] [ f ] if* ; inline
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M: seq-parser (compile)
parsers>> compile-parsers-quots
[ '[ _ parse-seq-element ] ] map
'[ input-slice V{ } clone <parse-result> _ 1&& ] ;
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TUPLE: choice-parser parsers ;
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M: choice-parser (compile)
parsers>> compile-parsers-quots '[ _ 0|| ] ;
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TUPLE: repeat0-parser parser ;
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: (repeat) ( quot: ( -- result ) result -- result )
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over call [
[ remaining>> >>remaining ] [ ast>> ] bi
over ast>> push (repeat)
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] [
nip
] if* ; inline recursive
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M: repeat0-parser (compile)
parser>> compile-parser-quot '[
input-slice V{ } clone <parse-result> _ swap (repeat)
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] ;
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TUPLE: repeat1-parser parser ;
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: repeat1-empty-check ( result -- result )
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[ dup ast>> empty? [ drop f ] when ] [ f ] if* ;
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M: repeat1-parser (compile)
parser>> compile-parser-quot '[
input-slice V{ } clone <parse-result> _ swap (repeat)
repeat1-empty-check
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] ;
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TUPLE: optional-parser parser ;
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: check-optional ( result -- result )
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[ input-slice f <parse-result> ] unless* ;
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M: optional-parser (compile)
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parser>> compile-parser-quot '[ @ check-optional ] ;
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TUPLE: semantic-parser parser quot ;
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: check-semantic ( result quot -- result )
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dupd '[ dup ast>> @ [ drop f ] unless ] when ; inline
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M: semantic-parser (compile)
[ parser>> compile-parser-quot ] [ quot>> ] bi
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'[ @ _ check-semantic ] ;
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TUPLE: ensure-parser parser ;
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: check-ensure ( old-input result -- result )
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[ ignore <parse-result> ] [ drop f ] if ;
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M: ensure-parser (compile)
parser>> compile-parser-quot '[ input-slice @ check-ensure ] ;
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TUPLE: ensure-not-parser parser ;
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: check-ensure-not ( old-input result -- result )
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[ drop f ] [ ignore <parse-result> ] if ;
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M: ensure-not-parser (compile)
parser>> compile-parser-quot '[ input-slice @ check-ensure-not ] ;
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TUPLE: action-parser parser quot ;
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: check-action ( result quot -- result )
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dupd '[ [ _ call( ast -- ast ) ] change-ast ] when ;
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M: action-parser (compile)
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[ parser>> compile-parser-quot ] [ quot>> ] bi
'[ @ _ check-action ] ;
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TUPLE: sp-parser parser ;
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M: sp-parser (compile)
parser>> compile-parser-quot '[
input-slice [ blank? ] trim-head-slice input-from pos namespaces:set @
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] ;
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TUPLE: delay-parser quot ;
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M: delay-parser (compile)
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! For efficiency we memoize the quotation.
! This way it is run only once and the
! parser constructed once at run time.
quot>> gensym [ delayed get set-at ] keep 1quotation ;
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TUPLE: box-parser quot ;
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M: box-parser (compile)
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! Calls the quotation at compile time
! to produce the parser to be compiled.
! This differs from 'delay' which calls
! it at run time.
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quot>> call( -- parser ) compile-parser-quot ;
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PRIVATE>
: token ( string -- parser )
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token-parser boa wrap-peg ;
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: satisfy ( quot -- parser )
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satisfy-parser boa wrap-peg ;
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: range ( min max -- parser )
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range-parser boa wrap-peg ;
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: seq ( seq -- parser )
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seq-parser boa wrap-peg ;
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: 2seq ( parser1 parser2 -- parser )
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2array seq ;
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: 3seq ( parser1 parser2 parser3 -- parser )
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3array seq ;
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: 4seq ( parser1 parser2 parser3 parser4 -- parser )
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4array seq ;
: seq* ( quot -- parser )
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{ } make seq ; inline
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: choice ( seq -- parser )
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choice-parser boa wrap-peg ;
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: 2choice ( parser1 parser2 -- parser )
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2array choice ;
: 3choice ( parser1 parser2 parser3 -- parser )
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3array choice ;
: 4choice ( parser1 parser2 parser3 parser4 -- parser )
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4array choice ;
: choice* ( quot -- parser )
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{ } make choice ; inline
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: repeat0 ( parser -- parser )
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repeat0-parser boa wrap-peg ;
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: repeat1 ( parser -- parser )
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repeat1-parser boa wrap-peg ;
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: optional ( parser -- parser )
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optional-parser boa wrap-peg ;
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: semantic ( parser quot -- parser )
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semantic-parser boa wrap-peg ;
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: ensure ( parser -- parser )
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ensure-parser boa wrap-peg ;
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: ensure-not ( parser -- parser )
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ensure-not-parser boa wrap-peg ;
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: action ( parser quot -- parser )
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action-parser boa wrap-peg ;
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: sp ( parser -- parser )
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sp-parser boa wrap-peg ;
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: hide ( parser -- parser )
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[ drop ignore ] action ;
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: delay ( quot -- parser )
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delay-parser boa wrap-peg ;
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: box ( quot -- parser )
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! because a box has its quotation run at compile time
! it must always have a new parser wrapper created,
! not a cached one. This is because the same box,
! compiled twice can have a different compiled word
! due to running at compile time.
! Why the [ ] action at the end? Box parsers don't get
! memoized during parsing due to all box parsers being
! unique. This breaks left recursion detection during the
! parse. The action adds an indirection with a parser type
! that gets memoized and fixes this. Need to rethink how
! to fix boxes so this isn't needed...
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box-parser boa f next-id parser boa [ ] action ;
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ERROR: parse-failed input word ;
SYNTAX: PEG:
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[let
(:) :> ( word def effect )
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[
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[
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def call compile :> compiled-def
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word [
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dup compiled-def compiled-parse
[ ast>> ] [ word parse-failed ] ?if
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] effect define-declared
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] with-compilation-unit
] append!
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] ;
{ "debugger" "peg" } "peg.debugger" require-when