utf.enc

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

%
% Encoding vector, operator and procedure redefinitions for Plan 9 UTF
% encoding. Prologues are expected to take steps to ensure operator
% redefinitions given here are actually used. Current implementation
% assumes UTF byte streams that represent ASCII or Latin1 text.
%

/UTFLatin1Encoding [
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/space
	/exclam
	/quotedbl
	/numbersign
	/dollar
	/percent
	/ampersand
	/quoteright
	/parenleft
	/parenright
	/asterisk
	/plus
	/comma
	/minus
	/period
	/slash
	/zero
	/one
	/two
	/three
	/four
	/five
	/six
	/seven
	/eight
	/nine
	/colon
	/semicolon
	/less
	/equal
	/greater
	/question
	/at
	/A
	/B
	/C
	/D
	/E
	/F
	/G
	/H
	/I
	/J
	/K
	/L
	/M
	/N
	/O
	/P
	/Q
	/R
	/S
	/T
	/U
	/V
	/W
	/X
	/Y
	/Z
	/bracketleft
	/backslash
	/bracketright
	/asciicircum
	/underscore
	/quoteleft
	/a
	/b
	/c
	/d
	/e
	/f
	/g
	/h
	/i
	/j
	/k
	/l
	/m
	/n
	/o
	/p
	/q
	/r
	/s
	/t
	/u
	/v
	/w
	/x
	/y
	/z
	/braceleft
	/bar
	/braceright
	/asciitilde
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/.notdef
	/dotlessi
	/grave
	/acute
	/circumflex
	/tilde
	/macron
	/breve
	/dotaccent
	/dieresis
	/.notdef
	/ring
	/cedilla
	/.notdef
	/hungarumlaut
	/ogonek
	/caron
	/.notdef		% was space
	/exclamdown
	/cent
	/sterling
	/currency
	/yen
	/brokenbar
	/section
	/dieresis
	/copyright
	/ordfeminine
	/guillemotleft
	/logicalnot
	/hyphen
	/registered
	/macron
	/degree
	/plusminus
	/twosuperior
	/threesuperior
	/acute
	/mu
	/paragraph
	/periodcentered
	/cedilla
	/onesuperior
	/ordmasculine
	/guillemotright
	/onequarter
	/onehalf
	/threequarters
	/questiondown
	/Agrave
	/Aacute
	/Acircumflex
	/Atilde
	/Adieresis
	/Aring
	/AE
	/Ccedilla
	/Egrave
	/Eacute
	/Ecircumflex
	/Edieresis
	/Igrave
	/Iacute
	/Icircumflex
	/Idieresis
	/Eth
	/Ntilde
	/Ograve
	/Oacute
	/Ocircumflex
	/Otilde
	/Odieresis
	/multiply
	/Oslash
	/Ugrave
	/Uacute
	/Ucircumflex
	/Udieresis
	/Yacute
	/Thorn
	/germandbls
	/agrave
	/aacute
	/acircumflex
	/atilde
	/adieresis
	/aring
	/ae
	/ccedilla
	/egrave
	/eacute
	/ecircumflex
	/edieresis
	/igrave
	/iacute
	/icircumflex
	/idieresis
	/eth
	/ntilde
	/ograve
	/oacute
	/ocircumflex
	/otilde
	/odieresis
	/divide
	/oslash
	/ugrave
	/uacute
	/ucircumflex
	/udieresis
	/yacute
	/thorn
	/ydieresis
] def

/NewFontDirectory FontDirectory maxlength dict def

%
% Apparently no guarantee findfont is defined in systemdict so the obvious
%
%	systemdict /findfont get exec
%
% can generate an error. So far the only exception is a VT600 (version 48.0).
%

userdict /@RealFindfont known not {
	userdict begin
		/@RealFindfont systemdict begin /findfont load end def
	end
} if

/findfont {
	dup NewFontDirectory exch known not {
		dup
		%dup systemdict /findfont get exec	% not always in systemdict
		dup userdict /@RealFindfont get exec
		dup /Encoding get StandardEncoding eq {
			dup length 1 add dict begin
				{1 index /FID ne {def}{pop pop} ifelse} forall
				/Encoding UTFLatin1Encoding def
				/Metrics 1 dict def
				Metrics /.notdef 0 put
				currentdict
			end
			/DummyFontName exch definefont
		} if
		NewFontDirectory 3 1 roll put
	} if
	NewFontDirectory exch get
} bind def

%
% Assume A0, except for A0A0 which is replaced by 20A0, can be ignored.
% Works with ASCII or Latin1 because A0 has been re-encoded as a zero
% width non-printing character. 
%

/UTFstring {
	dup {
		(\240\240) search {
			pop
			0 16#20 put
		}{pop exit} ifelse
	} loop
} bind def

/ashow {mark 4 1 roll UTFstring //ashow cvx exec cleartomark} bind def
/awidthshow {mark 7 1 roll UTFstring //awidthshow cvx exec cleartomark} bind def
/show {mark exch UTFstring //show cvx exec cleartomark} bind def
/stringwidth {UTFstring //stringwidth cvx exec} bind def
/widthshow {mark 5 1 roll UTFstring //widthshow cvx exec cleartomark} bind def

%
% kshow is harder - stack can't change because of the procedure.
%

/kshow dup load type /operatortype eq
	{{UTFstring kshow} bind}
	{{UTFstring //kshow cvx exec} bind}
ifelse def