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69 lines
3.0 KiB
Racket
69 lines
3.0 KiB
Racket
9 years ago
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#lang s-exp syntax/module-reader
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br/ragg/codegen/sexp-based-lang
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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 br/ragg/rules/parser
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br/ragg/rules/lexer
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br/ragg/rules/stx
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br/ragg/rules/rule-structs)
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(define (my-read in)
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(syntax->datum (my-read-syntax #f in)))
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(define (my-read-syntax src in)
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(define-values (first-line first-column first-position) (port-next-location in))
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(define tokenizer (tokenize in))
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(define rules
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(parameterize ([current-parser-error-handler
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(lambda (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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(grammar-parser tokenizer)))
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(define-values (last-line last-column last-position) (port-next-location in))
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(list (rules->stx src rules
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#:original-stx (datum->syntax #f 'original-stx
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(list src
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first-line
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first-column
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first-position
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(if (and (number? last-position)
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(number? first-position))
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(- last-position first-position)
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#f))))))
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;; Extension: we'd like to cooperate with DrRacket and tell
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;; it to use the default, textual lexer and color scheme when
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;; editing bf programs.
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;;
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;; See: http://docs.racket-lang.org/guide/language-get-info.html
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;; for more details, as well as the documentation in
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;; syntax/module-reader.
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(define (my-get-info key default default-filter)
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(case key
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[(color-lexer)
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(dynamic-require 'syntax-color/default-lexer
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'default-lexer)]
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[else
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(default-filter key default)]))
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