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30 lines
890 B
Racket
30 lines
890 B
Racket
#lang racket/base
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(require (for-syntax racket/base racket/syntax br/syntax) br/define racket/class sugar/list racket/list (only-in br/list push! pop!) racket/string racket/format racket/contract)
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(provide (all-defined-out) push! pop!)
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(define (newBuffer x) (string->bytes/latin-1 (format "~a" x)))
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(define buffer-length bytes-length)
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(struct exn:pitfall:test exn (data))
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(define (raise-test-exn val)
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(raise (exn:pitfall:test "pitfall test exn" (current-continuation-marks) val)))
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(define-syntax-rule (test-when cond expr)
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(if cond (raise-test-exn expr) expr))
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(define (color-string? x)
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(and (string? x)
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(if (string-prefix? x "#")
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(or (= (string-length x) 4) (= (string-length x) 7))
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#t)))
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(define (layout? x)
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(and (hash? x) (hash-has-key? x 'glyphs) (hash-has-key? x 'positions)))
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(define index? (and/c number? integer? (not/c negative?)))
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