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74 lines
3.0 KiB
Racket
74 lines
3.0 KiB
Racket
10 years ago
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#lang typed/racket/base
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(require (for-syntax racket/base racket/syntax))
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(require sugar/list sugar/debug racket/list racket/function math/flonum racket/vector math/statistics)
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(require "ocm-typed.rkt" "quads-typed.rkt" "utils-typed.rkt" "measure-typed.rkt" "world-typed.rkt" "logger-typed.rkt")
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(define-syntax (define/typed stx)
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(syntax-case stx ()
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[(_ (proc-name arg ... . rest-arg) type-expr body ...)
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#'(define/typed proc-name type-expr
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(λ(arg ... . rest-arg) body ...))]
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[(_ proc-name type-expr body ...)
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#'(begin
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(: proc-name type-expr)
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(define proc-name body ...))]))
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;; predicate for the soft hyphen
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(define/typed (soft-hyphen? x)
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(String . -> . Boolean)
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(equal? (format "~a" world:soft-hyphen) x))
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;; visible characters that also mark possible breakpoints
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(define/typed (visible-breakable? x)
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(String . -> . Boolean)
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(and (member x world:hyphens-and-dashes) #t))
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;; invisible characters that denote possible breakpoints
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(define/typed (invisible-breakable? x)
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(String . -> . Boolean)
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(and (member x (cons world:empty-string world:spaces)) #t))
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;; union of visible & invisible
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(define/typed (breakable? x)
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(Any . -> . Boolean)
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(cond
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[(string? x) (or (visible-breakable? x) (invisible-breakable? x))]
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[(word? x) (breakable? (word-string (cast x Quad)))]
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[else #f]))
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;; used by insert-spacers to determine which characters
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;; can be surrounded by stretchy spacers
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(define/typed (takes-justification-space? x)
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(Any . -> . Boolean)
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(whitespace/nbsp? x))
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;; test if a quad can be a word break:
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;; either it's an explicit word break,
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;; or it's breakable (and can be converted to a word break)
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(define/typed (possible-word-break-quad? q)
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(Quad . -> . Boolean)
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(or (word-break? q) (breakable? q)))
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;; convert a possible word break into an actual one
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(define/typed (convert-to-word-break q)
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(Quad . -> . Quad)
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(when (not (possible-word-break-quad? q))
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(error 'convert-to-word-break "input is not a possible word break:" q))
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(define result (cond
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[(word-break? q) q]
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[(word? q)
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(define str (word-string q)) ; str will be one character long, because we've exploded our input
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(apply word-break
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(merge-attrs q ; take q's attributes for formatting purposes
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(cond
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;; a space is ordinarily visible, but disappears at the end of a line
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[(equal? str " ") (list world:no-break-key " " world:before-break-key "")]
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;; soft hyphen is ordinarily invisible, but appears at the end of a line
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[(soft-hyphen? str) (list world:no-break-key "" world:before-break-key "-")]
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;; a visible breakable character is always visible
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[(visible-breakable? str) (list world:no-break-key str world:before-break-key str)]
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[else (cast (world:default-word-break-list) HashableList)])) (quad-list q))]
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[else #f]))
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(or result (error 'convert-to-word-break "result was a not word break for input:" q)))
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