44 lines
1.9 KiB
Racket
44 lines
1.9 KiB
Racket
#lang racket/base
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(provide pattern->unparser)
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(require preserves)
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(require racket/match)
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(require (only-in racket/syntax format-symbol))
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(require (only-in racket/list append-map))
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(require "type.rkt")
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(require "gen/schema.rkt")
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(define (pattern->unparser pattern src-stx)
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(match (unwrap pattern)
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[(NamedSimplePattern_ n p) (pattern->unparser p (escape n))]
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[(SimplePattern-any) src-stx]
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[(SimplePattern-atom (AtomKind-Float)) `(->float ,src-stx)]
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[(SimplePattern-atom (AtomKind-Double)) `(exact->inexact ,src-stx)]
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[(SimplePattern-atom _) src-stx]
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[(SimplePattern-embedded _interface) `(embedded ,src-stx)]
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[(SimplePattern-lit v) `',v]
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[(SimplePattern-seqof variable-pat)
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`(for/list [(item (in-list ,src-stx))] ,(pattern->unparser variable-pat 'item))]
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[(SimplePattern-setof pat)
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`(for/set [(item (in-set ,src-stx))] ,(pattern->unparser pat 'item))]
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[(SimplePattern-dictof key-pat value-pat)
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`(for/hash [((key value) (in-dict ,src-stx))]
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(values ,(pattern->unparser key-pat 'key)
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,(pattern->unparser value-pat 'value)))]
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[(SimplePattern-Ref r)
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`(*->preserve ,src-stx)]
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[(CompoundPattern-rec label-pat fields-pat)
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`(record ,(pattern->unparser label-pat src-stx) ,(pattern->unparser fields-pat src-stx))]
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[(CompoundPattern-tuple named-pats)
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`(list ,@(for/list [(p (in-list named-pats))] (pattern->unparser p src-stx)))]
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[(CompoundPattern-tuple* fixed-named-pats variable-named-pat)
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`(list* ,@(for/list [(p (in-list fixed-named-pats))] (pattern->unparser p src-stx))
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,(pattern->unparser variable-named-pat src-stx))]
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[(CompoundPattern-dict (DictionaryEntries entries))
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`(hash ,@(append-map (lambda (entry)
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(list `',(car entry)
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(pattern->unparser (cdr entry) src-stx)))
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(sorted-dict-entries entries)))]))
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