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https://github.com/ashinn/chibi-scheme.git
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Supporting double-width characters in line editor.
This commit is contained in:
Alex Shinn
parent
8c8358f3a5
commit
a481f31571
1 changed files with 145 additions and 9 deletions
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@ -178,13 +178,134 @@
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(buffer-string-set! buf new)
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(buffer-string-set! buf new)
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(buffer-gap-set! buf new-gap)))))
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(buffer-gap-set! buf new-gap)))))
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;; Adapted from fmt-unicode. TODO: convert to char-sets.
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(define low-non-spacing-chars '#u8(
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#xff #xff #xff #xff #xff #xff #xff #xff #xff #xff #xff #xff #xff #xff 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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#x78 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 #xfe #xff #xff #xff #xff #xff #x1f 0 0 0 0 0 0 0
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0 0 #x3f 0 0 0 0 0 0 #xf8 #xff #x01 0 0 #x01 0
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0 0 0 0 0 0 0 0 0 0 #xc0 #xff #xff #x3f 0 0
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0 0 #x02 0 0 0 #xff #xff #xff #x07 0 0 0 0 0 0
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0 0 0 0 #xc0 #xff #x01 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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#x06 0 0 0 0 0 0 #x10 #xfe #x21 #x1e 0 #x0c 0 0 0
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#x02 0 0 0 0 0 0 #x10 #x1e #x20 0 0 #x0c 0 0 0
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#x06 0 0 0 0 0 0 #x10 #xfe #x3f 0 0 0 0 #x03 0
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#x06 0 0 0 0 0 0 #x30 #xfe #x21 0 0 #x0c 0 0 0
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#x02 0 0 0 0 0 0 #x90 #x0e #x20 #x40 0 0 0 0 0
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#x04 0 0 0 0 0 0 0 0 #x20 0 0 0 0 0 0
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0 0 0 0 0 0 0 #xc0 #xc1 #xff #x7f 0 0 0 0 0
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0 0 0 0 0 0 0 #x10 #x40 #x30 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 #x0e #x20 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 #x04 #x7c 0 0 0 0 0
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0 0 0 0 0 0 #xf2 #x07 #x80 #x7f 0 0 0 0 0 0
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0 0 0 0 0 0 #xf2 #x1f 0 #x3f 0 0 0 0 0 0
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0 0 0 #x03 0 0 #xa0 #x02 0 0 0 0 0 0 #xfe #x7f
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#xdf 0 #xff #xff #xff #xff #xff #x1f #x40 0 0 0 0 0 0 0
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0 0 0 0 0 #xe0 #xfd #x02 0 0 0 #x03 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 #x1c 0 0 0 #x1c 0 0 0 #x0c 0 0 0 #x0c 0
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0 0 0 0 0 0 #x80 #x3f #x40 #xfe #x0f #x20 0 0 0 0
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0 #x38 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 #x02 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 #x87 #x01 #x04 #x0e 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0 0 0 #xff #x1f #xe2 #x07))
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(define (unicode-char-width c)
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(let ((ci (char->integer c)))
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(cond
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;; hand-checked ranges from EastAsianWidth.txt
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((<= #x1100 ci #x115F) 2) ; Hangul
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((<= #x2E80 ci #x4DB5) 2) ; CJK
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((<= #x4E00 ci #xA4C6) 2)
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((<= #xAC00 ci #xD7A3) 2) ; Hangul
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((<= #xF900 ci #xFAD9) 2) ; CJK compat
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((<= #xFE10 ci #xFE6B) 2)
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((<= #xFF01 ci #xFF60) 2)
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((<= #xFFE0 ci #xFFE6) 2)
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((<= #x20000 ci #x30000) 2)
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;; non-spacing mark (Mn) ranges from UnicodeData.txt
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((<= #x0300 ci #x3029)
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;; inlined bit-vector-ref for portability
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(let* ((i (- ci #x0300))
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(byte (quotient i 8))
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(off (remainder i 8)))
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(if (zero? (bitwise-and (bytevector-u8-ref low-non-spacing-chars byte)
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(arithmetic-shift 1 off)))
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1
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0)))
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((<= #x302A ci #x302F) 0)
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((<= #x3099 ci #x309A) 0)
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((= #xFB1E ci) 0)
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((<= #xFE00 ci #xFE23) 0)
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((<= #x1D167 ci #x1D169) 0)
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((<= #x1D17B ci #x1D182) 0)
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((<= #x1D185 ci #x1D18B) 0)
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((<= #x1D1AA ci #x1D1AD) 0)
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((<= #xE0100 ci #xE01EF) 0)
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(else 1))))
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(define (unicode-string-width str . o)
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(let ((start (if (pair? o) (car o) 0))
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(end (if (and (pair? o) (pair? (cdr o)))
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(cadr o)
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(string-length str))))
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(let lp1 ((i start) (width 0))
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(if (>= i end)
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width
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(let ((c (string-ref str i)))
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(cond
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;; ANSI escapes
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((and (= 27 (char->integer c)) ; esc
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(< (+ i 1) end)
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(eqv? #\[ (string-ref str (+ i 1))))
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(let lp2 ((i (+ i 2)))
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(cond ((>= i end) width)
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((memv (string-ref str i) '(#\m #\newline))
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(lp1 (+ i 1) width))
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(else (lp2 (+ i 1))))))
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;; unicode characters
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((>= (char->integer c) #x80)
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(lp1 (+ i 1) (+ width (unicode-char-width c))))
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;; normal ASCII
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(else (lp1 (+ i 1) (+ width 1)))))))))
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(define (buffer-update-position! buf)
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(define (buffer-update-position! buf)
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(let ((pos (buffer-pos buf))
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(let ((pos (buffer-pos buf))
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(gap (buffer-gap buf))
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(gap (buffer-gap buf))
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(str (buffer-string buf))
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(str (buffer-string buf))
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(end (string-length (buffer-string buf)))
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(end (string-length (buffer-string buf)))
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(width (buffer-width buf)))
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(width (buffer-width buf)))
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;; TODO: Support double and zero-width chars and ANSI escapes.
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(cond
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(cond
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((buffer-single-line? buf)
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((buffer-single-line? buf)
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;; The "start" is the last left-most column of the buffer when
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;; The "start" is the last left-most column of the buffer when
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@ -199,17 +320,31 @@
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;; at a time. A beginning-of-line command will restore the
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;; at a time. A beginning-of-line command will restore the
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;; "start" to 0 immediately.
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;; "start" to 0 immediately.
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;; We assume no embedded newlines in this case.
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;; We assume no embedded newlines in this case.
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(let ((start (buffer-start buf)))
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(let ((start (buffer-start buf))
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(min-width (unicode-string-width str 0 (buffer-min buf))))
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(cond
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(cond
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((> start pos)
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((> start pos)
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;; We've moved back before the current start - reset to pos.
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(buffer-start-set! buf pos))
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(buffer-start-set! buf pos))
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((> (+ 1 (buffer-min buf) (- pos start)) (buffer-width buf))
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((> (+ 1 min-width (unicode-string-width str start pos))
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(buffer-start-set! buf (max 0 (- (+ 1 (buffer-min buf) pos)
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(buffer-width buf))
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;; The edited text is wider than the screen - scroll the
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;; start so that pos fits on the end.
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;; TODO: This isn't correct for wide characters, need to
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;; loop checking individual widths.
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(buffer-start-set!
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buf
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(max 0 (- (+ 1 min-width (unicode-string-width str 0 pos))
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(buffer-width buf))))))
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(buffer-width buf))))))
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(buffer-col-set! buf (+ (buffer-min buf) (- pos (buffer-start buf))))))
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;; Compute the current column as the width of the prompt plus
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;; the width of the visible buffer from start to pos.
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(let* ((vis-width (unicode-string-width str (buffer-start buf) pos))
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(col (+ min-width vis-width)))
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(buffer-col-set! buf col))))
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(else
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(else
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;; Otherwise, in a multi-line editor we need to scan for
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;; Otherwise, in a multi-line editor we need to scan for
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;; newlines to determine the current (relative) row and column.
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;; newlines to determine the current (relative) row and column.
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;; TODO: Handle ANSI escapes.
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(let lp ((i 0) (row 0) (col 0)) ;; update row/col
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(let lp ((i 0) (row 0) (col 0)) ;; update row/col
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(cond ((= i pos)
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(cond ((= i pos)
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(buffer-row-set! buf row)
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(buffer-row-set! buf row)
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@ -220,10 +355,11 @@
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buf (if (and (zero? col) (> row 0)) (- row 1) row)))
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buf (if (and (zero? col) (> row 0)) (- row 1) row)))
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((eqv? #\newline (string-ref str i))
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((eqv? #\newline (string-ref str i))
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(lp (+ i 1) (+ row 1) 0))
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(lp (+ i 1) (+ row 1) 0))
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((= (+ col 1) width)
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(lp (+ i 1) (+ row 1) 0))
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(else
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(else
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(lp (+ i 1) row (+ col 1)))))))))
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(let ((off (unicode-char-width (string-ref str i))))
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(if (>= (+ col off) width)
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(lp (+ i 1) (+ row 1) 0)
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(lp (+ i 1) row (+ col off)))))))))))
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(define (buffer-clear buf out)
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(define (buffer-clear buf out)
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;; goto start of input
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;; goto start of input
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