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As mentioned in the section * [[#Unicode blocks]] above, the canonical source for Unicode blocks is the file ''Blocks.txt''<ref name="Blocks"/> in the Unicode Character Database. The main properties of blocks are described in the Unicode Standard<ref name="Unicode"/> (Section 3.4, paragraph D10b). On the other hand, as mentioned in the section [[#ConTeXt names List of Unicode blocks]] above, the ConTeXt names of Unicode blocks are defined in the source file {{src|char-ini.lua}}.
As mentioned in * {{cmd|definefontfallback}} — manual page with more information on the section [[#The list ConTeXt names of blocks]] above, the article entitled [[List of Unicode blocks]] contains a table of Unicode blocks, and their ConTeXt names, and links to more information about themusage.
The verses in * {{src|char-ini.lua}} — source file containing the definitions of the section [[#An example usage ConTeXt names of Unicode blocks in ConTeXt]] above are from the Wikipedia article on the poem ''Jabberwocky''<ref>Wikipedia contributors, ''Jabberwocky'', Wikipedia: The Free Encyclopaedia, 2017-11-03, 07:58 UTC, https://en.wikipedia.org/w/index.php?title=Jabberwocky&oldid=808507152, Retrieved 2017-11-03.</ref> by Lewis Carroll.
Unicode blocks in ConTeXt (view source)
Revision as of 16:09, 4 November 2017
, 16:09, 4 November 2017no edit summary
ConTeXt has special names for all Unicode blocks. These names can be used to specify ranges of code points in the setups of several commands.
This article uses some basic terms, such as ''character'', ''code point'', and ''assigned code point'', from the Unicode Standard<ref name="Unicode">The Unicode Consortium, ''The Unicode Standard'', Version 10.0.0, The Unicode Consortium, Mountain View, CA, USA, 2016, http://www.unicode.org/versions/Unicode10.0.0/, Retrieved 2017-11-03.</ref>. For brief descriptions of these terms, see the Unicode glossary<ref name="Unicode-glossary">The Unicode Consortium, ''Glossary'', http://www.unicode.org/glossary/, Retrieved 2017-11-03.</ref>.
== Unicode blocks ==
A Unicode block, or, simply, a block, is any of the subsets of the Unicode code space that are listed in the file {{code|Blocks.txt}}<ref name="Blocks">The Unicode Consortium, ''Blocks.txt'', ftp://www.unicode.org/Public/UNIDATA/Blocks.txt, Retrieved 2017-11-03.</ref> of the Unicode Character Database. The Unicode code space is the set of all code points, that is, the set of all integers from 0 to the integer whose hexadecimal representation is 10FFF.
The main properties of blocks are described in the Unicode Standard<ref name="Unicode"/> (Section 3.4, paragraph D10b). Every block is an interval of code points, and distinct blocks are disjoint from each other. In particular, the blocks form a partition of a subset of the Unicode code space.
A block starts at a code point that is a multiple of 16. The number of code points in each block is also a multiple of 16. Thus, the hexadecimal representation of the first code point in a block is of the form ''pqrs''0, and that of the last code point in it is of the form ''tuvw''F, where ''p'', ''q'', ''r'', ''s'', ''t'', ''u'', ''v'', and ''w'', are hexadecimal digits.
The number of code points in a block varies. Some, such as the block named {{code|Syriac Supplement}}, have just 16 code points, and some others, such as the block named {{code|CJK Unified Ideographs Extension B}} with 42720 elements, have thousands of code points.
Every assigned code point belongs to some block, but there are blocks which contain unassigned code points too; for example, the block named {{code|Telugu}} contains the unassigned code point 0C50. LastlyOn the other hand, there are some code points, necessarily unassigned, which do not belong to any block; the code point 0870 is one such. Thus, the set of all assigned code points is a proper subset of the union of all the blocks, and the union of all the blocks is a proper subset of the Unicode code space.
== ConTeXt names of Unicode blocks ==
ConTeXt has its own names for all the Unicode blocks. These names are defined in the source file {{src|char-ini.lua}}. Most of them are obtained by converting the Unicode name of the block to the lower case, and removing the hyphens and spaces in the name. == The list of blocks == See the article entitled [[List of Unicode blocks]], for contains a table of Unicode blocks, their ConTeXt names, and links to more information about them.
== An example usage of Unicode blocks in ConTeXt ==
\stoptext
</context>
The verses in the above example are from the Wikipedia article on the poem ''Jabberwocky''<ref>Wikipedia contributors, ''Jabberwocky'', Wikipedia: The Free Encyclopaedia, 2017-11-03, 07:58 UTC, https://en.wikipedia.org/w/index.php?title=Jabberwocky&oldid=808507152, Retrieved 2017-11-03.</ref> by Lewis Carroll.
== Another example ==
so {{code|context}} is indeed, and as expected, taking some of the glyphs from the fallback font, which, in this case, is provided by the local operating system.
== Notes See also == This article uses some basic terms, such as ''character'', ''code point'', and ''assigned code point'', from the Unicode Standard<ref name="Unicode">The Unicode Consortium, ''The Unicode Standard'', Version 10.0.0, The Unicode Consortium, Mountain View, CA, USA, 2016, http://www.unicode.org/versions/Unicode10.0.0/, Retrieved 2017-11-03.</ref>. For brief descriptions of these terms, see the Unicode glossary<ref name="Unicode-glossary">The Unicode Consortium, ''Glossary'', http://www.unicode.org/glossary/, Retrieved 2017-11-03.</ref>.
== References ==
<references/>
