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0223aef416
Doug McIlroy noted this vague term, which groff employs for multiple purposes. Eliminate its application to input processing. There is now no longer such a thing as an "entity" in the groff language. * doc/groff.texi (Character Translations): Do it. Also clarify "nothing" as "the dummy character". (Using Symbols): Do it. Also recast explanation of difference between characters and glyphs. Explicitly state that spaces aren't glyphs. Document that `rchar` request can't remove definitions supplied by font description files. (Ligatures and Kerning): Speak of "special characters", not "entities". (Other Differences): Recast discussion of character-to-glyph transformation. Stop qualifying characters as "input". Recast discussion of example. * font/devutf8/NOTES: Revise use of terminology. Perform a Kemper notectomy. Wrap long lines. * man/groff.7.man (Request short reference) <char>: Speak of a "special character", not an "entity". <rchar>: Document that request can't remove definitions supplied by font description files. * man/groff_diff.7.man (Implementation differences): Sync with our Texinfo manual. The use of "entity" to describe how a glyph gets mapped back to a character (sequence) for the HTML and terminal output devices is retained. That usage is restricted to discussion of output drivers (code comments and function names notwithstanding).
48 lines
1.5 KiB
Plaintext
48 lines
1.5 KiB
Plaintext
All \[charXXX] special character names have been removed from the font
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files. They don't make sense for Unicode.
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The following special character name from the AT&T troff manual by
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Ossanna and Kernighan is unmapped:
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bs shaded solid ball (Bell System logo, AT&T logo)
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Code point 0x002D has not been given a name because its Unicode name
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HYPHEN-MINUS is so ambiguous that it is unusable for serious typographic
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work.
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\[wp] has been mapped to 0x2118, because according to Unicode 4.1's
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NamesList.txt, U+2118 SCRIPT CAPITAL P is really a Weierstrass 'p',
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neither SCRIPT nor CAPITAL.
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The following line could be added; \[space] is known to devps but is not
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documented and not known to devdvi (actually, there is no space glyph
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within the TeX system).
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space 24 0 0x0020
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devps maps \[*U] to 'Upsilon1', which is equivalent to 0x03D2. We map
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it to 0x03A5 instead.
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devps maps \[*W] to 'Omega', which is equivalent to either 0x2126 or
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0x03A9. We map it to 0x03A9.
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devps maps \[*D] to 'Delta', which is equivalent to either 0x2206 or
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0x0394. We map it to 0x0394.
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Adding Unicode characters
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-------------------------
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Assume you want to use a Unicode character not provided in the list, say
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U+20AC. You need to do two things:
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- Add a line
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u20AC 24 0 0x20AC
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(the second column is computed as 24 * wcwidth(0x20AC)) to the file
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R.proto, or, when groff is already installed, to the four font
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description files in $(prefix)/share/groff/<version>/font/devutf8/.
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- In your source file, use the notation \[u20AC] to access it.
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