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#lang debug racket/base
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(require racket/match
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"quad.rkt")
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(provide (all-defined-out))
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(struct compiler (passes)
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#:constructor-name make-compiler
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#:guard (λ (procs name)
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(unless ((list-of procedure?) procs)
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(raise-argument-error 'bad-input-to-compiler-constructor "list of procedures" procs))
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procs)
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#:property prop:procedure
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(λ (self input) ((apply compose1 (reverse (compiler-passes self))) input)))
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(define (compiler-append c passes)
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(make-compiler (append (compiler-passes c) passes)))
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(define-syntax-rule (define-pass (PASS-NAME ARG OTHER-ARG ...)
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#:precondition PRECOND-PROC
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#:postcondition POSTCOND-PROC
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EXPRS ...)
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(define PASS-NAME
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(make-compiler (list (λ (ARG OTHER-ARG ...)
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(unless (PRECOND-PROC ARG)
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(error 'PASS-NAME (format "precondition failed: ~a for value ~v" 'PRECOND-PROC ARG)))
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(define res (let () EXPRS ...))
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(unless (POSTCOND-PROC res)
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(error 'PASS-NAME (format "postcondition failed: ~a for value ~v" 'POSTCOND-PROC res)))
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res)))))
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