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48 lines
1.7 KiB
Racket
48 lines
1.7 KiB
Racket
#lang s-exp syntax/module-reader
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brag/codegen/expander
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#:read my-read
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#:read-syntax my-read-syntax
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#:info my-get-info
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#:whole-body-readers? #t
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(require brag/rules/parser
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brag/rules/lexer
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brag/rules/stx
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brag/rules/rule-structs)
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(define (my-read in) (syntax->datum (my-read-syntax #f in)))
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(define ((my-parser-error-handler src) tok-ok? tok-name tok-value start-pos end-pos)
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(raise-syntax-error
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#f
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(format "Error while parsing grammar near: ~a [line=~a, column=~a, position=~a]"
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tok-value
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(pos-line start-pos)
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(pos-col start-pos)
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(pos-offset start-pos))
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(datum->syntax #f
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(string->symbol (format "~a" tok-value))
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(list src
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(pos-line start-pos)
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(pos-col start-pos)
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(pos-offset start-pos)
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(if (and (number? (pos-offset end-pos))
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(number? (pos-offset start-pos)))
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(- (pos-offset end-pos)
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(pos-offset start-pos))
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#f)))))
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(define (my-read-syntax src in)
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(define tokenizer (tokenize in))
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(define rules (parameterize ([current-parser-error-handler (my-parser-error-handler src)])
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(grammar-parser tokenizer)))
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(for/list ([r (in-list rules)])
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(rule->stx src r)))
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(define (my-get-info key default default-filter)
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(case key
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[(color-lexer) (dynamic-require 'brag/private/colorer 'color-brag (λ () #f))]
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[(drracket:indentation) (dynamic-require 'brag/private/indenter 'indent-brag (λ () #f))]
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[else (default-filter key default)]))
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