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66 lines
2.5 KiB
Scheme
66 lines
2.5 KiB
Scheme
#cs
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(module parser-builder mzscheme
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(require "input-file-parser.ss"
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"grammar.ss"
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"table.ss"
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(lib "class.ss")
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(lib "contracts.ss"))
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(provide/contract
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(build-parser ((string? any? any? syntax? (listof syntax?) (listof syntax?)
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(union syntax? false?) syntax? syntax?) . ->* . (any? any? any? any?))))
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(define (strip so)
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(syntax-local-introduce
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(datum->syntax-object
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#f
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(syntax-object->datum so)
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so
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so)))
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(define (fix-check-syntax start terms prods precs ends)
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(syntax-case prods ()
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((_ (bind ((bound ...) x ...) ...) ...)
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(let ((binds (syntax->list (syntax (bind ...))))
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(bounds (append start
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(apply
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append
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(map syntax->list
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(apply
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append
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(map syntax->list
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(syntax->list (syntax (((bound ...) ...) ...)))))))))
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(terms (get-term-list terms))
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(precs (if precs
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(syntax-case precs ()
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((_ (__ term ...) ...)
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(apply append (map syntax->list (syntax->list (syntax ((term ...) ...)))))))
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null)))
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`(if #f (let ,(map (lambda (bind)
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`(,(strip bind) void))
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(append terms binds))
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(void ,@(append ends precs (map strip bounds)))))))))
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(define (build-parser filename src-pos suppress input-terms start end assocs prods runtime)
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(let* ((grammar (parse-input start end input-terms assocs prods runtime src-pos))
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(table (build-table grammar filename suppress))
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(num-non-terms (send grammar get-num-non-terms))
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(token-code
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`(let ((ht (make-hash-table)))
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(begin
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,@(map (lambda (term)
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`(hash-table-put! ht
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',(gram-sym-symbol term)
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,(+ num-non-terms (gram-sym-index term))))
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(send grammar get-terms))
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ht)))
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(actions-code
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`(vector ,@(map prod-action (send grammar get-prods)))))
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(values table
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token-code
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actions-code
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(fix-check-syntax start input-terms prods assocs end))))
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)
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