47 lines
1.3 KiB
Scheme
47 lines
1.3 KiB
Scheme
#lang scheme/unit
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(require string-constants
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mzlib/class
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mzlib/list
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framework
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"drsig.ss")
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(import)
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(export drscheme:modes^)
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(define-struct mode (name surrogate repl-submit matches-language))
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(define modes (list))
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(define (get-modes) modes)
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(define (add-mode name surrogate repl-submit matches-language)
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(let ([new-mode (make-mode name
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surrogate
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repl-submit
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matches-language)])
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(set! modes (cons new-mode modes))
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new-mode))
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(define (not-a-language-language? l)
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(and (not (null? l))
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(equal? (car (last-pair l))
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(string-constant no-language-chosen))))
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(define (add-initial-modes)
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;; must be added first, to make it last in mode list,
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;; since predicate matches everything
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(add-mode
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(string-constant scheme-mode)
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(new scheme:text-mode%)
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(λ (text prompt-position) (scheme:text-balanced? text prompt-position))
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(λ (l) #t))
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(add-mode
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(string-constant text-mode)
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#f
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(λ (text prompt-position) #t)
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(λ (l)
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(and l
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(or (not-a-language-language? l)
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(ormap (λ (x) (regexp-match #rx"Algol" x)) l))))))
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