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106 lines
4.7 KiB
Racket
106 lines
4.7 KiB
Racket
#lang debug racket/base
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(require racket/runtime-path
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racket/string
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racket/path
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racket/match
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"attrs.rkt")
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(provide (all-defined-out))
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(define-runtime-path quadwriter-fonts-dir "fonts")
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(define-runtime-path default-font-face "fonts/default/SourceSerifPro-Regular.otf")
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(define default-font-family "text")
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(define default-font-size 12)
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(define default-line-height 16)
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(define default-font-color "black")
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(define default-font-features "tnum 1")
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(define font-paths (make-hash))
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(define top-font-directory "fonts")
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(define font-file-extensions '(#".otf" #".ttf" #".woff"))
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(define (setup-font-path-table! base-path)
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;; create a table of font paths that we can use to resolve references to font names.
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;; rules for font naming
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;; "fonts" subdirectory on top
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;; family directories inside: each named with font family name
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;; this makes it possible to give font families generic names (e.g., "body-text")
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;; and change the font files without disturbing anything else.
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(hash-clear! font-paths)
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(define doc-fonts-dir
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(simple-form-path
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(build-path (match/values (split-path base-path)
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[(base name #true) (build-path base name)]
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[(dir _ _) dir]) top-font-directory)))
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;; run doc-fonts-dir first because earlier fonts take precedence (using hash-ref! below)
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(for* ([fonts-dir (in-list (list doc-fonts-dir quadwriter-fonts-dir))]
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#:when (directory-exists? fonts-dir)
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[font-family-subdir (in-directory fonts-dir)]
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#:when (directory-exists? font-family-subdir)
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[font-path (in-directory font-family-subdir)]
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#:when (member (path-get-extension font-path) font-file-extensions))
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(match-define (list font-path-string family-name)
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(for/list ([x (list font-path font-family-subdir)])
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(path->string (find-relative-path fonts-dir x))))
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(define path-parts (for/list ([part (in-list (explode-path (string->path (string-downcase font-path-string))))])
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(path->string part)))
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(define key
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(cons (string-downcase family-name)
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(cond
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[(member "bold-italic" path-parts) 'bi]
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[(member "bold" path-parts) 'b]
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[(member "italic" path-parts) 'i]
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[else 'r])))
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;; only set value if there's not one there already.
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;; this means that we only use the first eligible font we find.
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(hash-ref! font-paths key font-path)))
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(define (font-attrs->path font-family bold italic)
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;; find the font-path corresponding to a certain family name and style.
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(define key (cons (string-downcase font-family)
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(cond
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[(and bold italic) 'bi]
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[bold 'b]
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[italic 'i]
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[else 'r])))
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(define regular-key (cons font-family 'r))
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(cond
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[(hash-ref font-paths key #false)]
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[(hash-ref font-paths regular-key #false)]
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[else default-font-face]))
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(define (resolve-font-path! attrs)
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;; convert references to a font family and style to an font path on disk
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;; we trust it exists because we used `setup-font-path-table!` earlier,
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;; but if not, fallback fonts will kick in, on the idea that a missing font shouldn't stop the show
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(define this-font-family (hash-ref! attrs :font-family default-font-family))
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(unless (complete-path? this-font-family)
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(define this-bold (hash-ref! attrs :font-bold #false))
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(define this-italic (hash-ref! attrs :font-italic #false))
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(hash-set! attrs :font-path (font-attrs->path this-font-family this-bold this-italic))))
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(define (parse-em pstr)
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(define em-suffix "em")
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(and
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pstr
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(string? pstr)
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(string-suffix? pstr em-suffix)
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(string->number (string-trim pstr em-suffix))))
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(define (resolve-font-size! attrs)
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;; convert font-size attributes into a simple font size
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;; we stashed the previous size in private key 'font-size-previous
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(define prev-font-size-key 'font-size-previous)
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(define val (parse-dimension (hash-ref attrs :font-size default-font-size)))
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(define adjustment (parse-em val))
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;; if our value represents an adjustment, we apply the adjustment to the previous value
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;; otherwise we use our value directly
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(define base-size (if adjustment (hash-ref attrs prev-font-size-key default-font-size) val))
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(define base-size-adjusted (and base-size (* base-size (or adjustment 1))))
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;; we write our new value into both font-size and font-size-previous
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;; because as we cascade down, we're likely to come across superseding values
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;; of font-size (but font-size-previous will persist)
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(hash-set! attrs :font-size base-size-adjusted)
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(hash-set! attrs prev-font-size-key base-size-adjusted))
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