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104 lines
4.1 KiB
Scheme
104 lines
4.1 KiB
Scheme
#cs
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(module yacc mzscheme
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(require-for-syntax "private-yacc/parser-builder.ss"
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"private-yacc/yacc-helper.ss")
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(require "private-yacc/terminal.ss"
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"private-yacc/parser-actions.ss"
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"private-yacc/array2d.ss")
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(provide define-tokens define-empty-tokens parser)
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(define-syntax parser
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(lambda (stx)
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(syntax-case stx ()
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((_ args ...)
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(let ((arg-list (syntax->list (syntax (args ...))))
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(debug #f)
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(error #f)
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(tokens #f)
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(start #f)
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(end #f)
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(precs #f)
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(grammar #f))
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(for-each
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(lambda (arg)
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(syntax-case arg (debug error tokens start end precs grammar)
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((debug filename)
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(cond
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((not (string? (syntax-object->datum (syntax filename))))
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(raise-syntax-error
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'parser-debug
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"Debugging filename must be a string"
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(syntax filename)))
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(debug
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(raise-syntax-error #f "Multiple debug declarations" stx))
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(else
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(set! debug (syntax-object->datum (syntax filename))))))
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((error expression)
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(if error
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(raise-syntax-error #f "Multiple error declarations" stx)
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(set! error (syntax expression))))
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((tokens def ...)
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(if tokens
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(raise-syntax-error #f "Multiple tokens declarations" stx)
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(set! tokens arg)))
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((start symbol)
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(cond
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((not (identifier? (syntax symbol)))
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(raise-syntax-error
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'parser-start
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"Start non-terminal must be a symbol"
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(syntax symbol)))
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(start
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(raise-syntax-error #f "Multiple start declarations" stx))
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(else
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(set! start (syntax symbol)))))
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((end symbols ...)
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(begin
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(for-each
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(lambda (sym)
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(if (not (identifier? sym))
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(raise-syntax-error
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'parser-end
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"End token must be a symbol"
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sym)))
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(syntax->list (syntax (symbols ...))))
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(if end
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(raise-syntax-error #f "Multiple end declarations" stx))
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(set! end (syntax->list (syntax (symbols ...))))))
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((precs decls ...)
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(if precs
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(raise-syntax-error #f "Multiple precs declarations" stx)
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(set! precs arg)))
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((grammar prods ...)
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(if grammar
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(raise-syntax-error #f "Multiple grammar declarations" stx)
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(set! grammar arg)))
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(_ (raise-syntax-error 'parser-args "argument must match (debug filename), (error expression), (tokens def ...), (start non-term), (end tokens ...), (precs decls ...), or (grammar prods ...)" arg))))
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(syntax->list (syntax (args ...))))
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(if (not tokens)
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(raise-syntax-error #f "missing tokens declaration" stx))
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(if (not error)
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(raise-syntax-error #f "missing error declaration" stx))
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(if (not grammar)
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(raise-syntax-error #f "missing grammar declaration" stx))
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(if (not end)
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(raise-syntax-error #f "missing end declaration" stx))
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(build-parser (if debug debug "")
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error
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tokens
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start
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end
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precs
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grammar
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#'here
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stx)))
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(_
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(raise-syntax-error
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#f
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"parser must have the form (parser args ...)"
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stx)))))
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) |