Update documentation and comments for UCD generation
This commit is contained in:
Philip Hazel
parent
838cdac4dc
commit
87571b5af3
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@ -10,20 +10,15 @@
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# PCRE project by Peter Kankowski in 2008 as part of a previous upgrading of
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# Unicode property support. A number of extensions have since been added. The
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# main difference in the 2021 upgrade (apart from comments and layout) is that
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# the data tables (e.g. list of script names) are now held in a separate Python
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# module that is shared with the other Generate scripts.
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# the data tables (e.g. list of script names) are now listed in or generated by
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# a separate Python module that is shared with the other Generate scripts.
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#
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# This script must be run in the "maint" directory. It requires eight Unicode
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# data tables: DerivedBidiClass.txt, DerivedGeneralCategory.txt,
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# GraphemeBreakProperty.txt, PropList.txt, Scripts.txt, ScriptExtensions.txt,
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# CaseFolding.txt, and emoji-data.txt. These must be in the Unicode.tables
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# subdirectory.
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#
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# DerivedBidiClass.txt and DerivedGeneralCategory.txt are in the "extracted"
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# subdirectory of the Unicode database (UCD) on the Unicode web site;
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# GraphemeBreakProperty.txt is in the "auxiliary" subdirectory. PropList.txt,
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# Scripts.txt, ScriptExtensions.txt, and CaseFolding.txt are directly in the
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# UCD directory.
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# This script must be run in the "maint" directory. It requires the following
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# Unicode data tables: BidiMirrorring.txt, CaseFolding.txt,
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# DerivedBidiClass.txt, DerivedCoreProperties.txt, DerivedGeneralCategory.txt,
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# GraphemeBreakProperty.txt, PropList.txt, PropertyAliases.txt,
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# PropertyValueAliases.txt, ScriptExtensions.txt, Scripts.txt, and
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# emoji-data.txt. These must be in the Unicode.tables subdirectory.
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#
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# The emoji-data.txt file is found in the "emoji" subdirectory even though it
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# is technically part of a different (but coordinated) standard as shown
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@ -32,6 +27,11 @@
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#
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# http://unicode.org/Public/emoji/13.0/ReadMe.txt
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#
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# DerivedBidiClass.txt and DerivedGeneralCategory.txt are in the "extracted"
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# subdirectory of the Unicode database (UCD) on the Unicode web site;
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# GraphemeBreakProperty.txt is in the "auxiliary" subdirectory. The other files
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# are in the top-level UCD directory.
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#
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# -----------------------------------------------------------------------------
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# Minor modifications made to the original script:
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# Added #! line at start
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@ -106,6 +106,7 @@
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# Changes to the refactored script:
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#
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# 26-December-2021: Refactoring completed
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# 10-January-2022: Addition of general Boolean property support
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#
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# ----------------------------------------------------------------------------
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#
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@ -117,7 +118,8 @@
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# Conceptually, there is a table of records (of type ucd_record), one for each
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# Unicode character. Each record contains the script number, script extension
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# value, character type, grapheme break type, offset to caseless matching set,
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# offset to the character's other case, and the bidi class/control.
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# offset to the character's other case, the bidi class, and offset to bitmap of
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# Boolean properties.
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#
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# A real table covering all Unicode characters would be far too big. It can be
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# efficiently compressed by observing that many characters have the same
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@ -125,7 +127,7 @@
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# the same set of records as other blocks. This leads to a 2-stage lookup
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# process.
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#
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# This script constructs six tables. The ucd_caseless_sets table contains
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# This script constructs seven tables. The ucd_caseless_sets table contains
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# lists of characters that all match each other caselessly. Each list is
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# in order, and is terminated by NOTACHAR (0xffffffff), which is larger than
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# any valid character. The first list is empty; this is used for characters
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@ -136,13 +138,12 @@
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# in script runs all come from the same set. The first element in the vector
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# contains the number of subsequent elements, which are in ascending order.
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#
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# The lists of scripts in script_names and script_abbrevs are partitioned into
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# two groups. Scripts that appear in at least one character's script extension
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# list come first, follwed by "Unknown" and then all the rest. This sorting is
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# done certain automatically in the GenerateCommon.py script. A script's number
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# is its index in these lists.
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# Scripts are partitioned into two groups. Scripts that appear in at least one
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# character's script extension list come first, followed by "Unknown" and then
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# all the rest. This sorting is done automatically in the GenerateCommon.py
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# script. A script's number is its index in the script_names list.
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#
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# The ucd_script_sets vector contains bitmaps that represent lists of scripts
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# The ucd_script_sets table contains bitmaps that represent lists of scripts
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# for Script Extensions properties. Each bitmap consists of a fixed number of
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# unsigned 32-bit numbers, enough to allocate a bit for every script that is
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# used in any character's extension list, that is, enough for every script
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@ -151,10 +152,15 @@
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# bitmap has no bits set; characters that have no script extensions have zero
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# as their script extensions value so that they use this map.
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#
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# The ucd_records table contains one instance of every unique record that is
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# required. The ucd_stage1 table is indexed by a character's block number,
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# which is the character's code point divided by 128, since 128 is the size
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# of each block. The result of a lookup in ucd_stage1 a "virtual" block number.
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# The ucd_boolprop_sets table contains bitmaps that represent lists of Boolean
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# properties. Each bitmap consists of a fixed number of unsigned 32-bit
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# numbers, enough to allocate a bit for each supported Boolean property.
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#
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# The ucd_records table contains one instance of every unique character record
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# that is required. The ucd_stage1 table is indexed by a character's block
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# number, which is the character's code point divided by 128, since 128 is the
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# size of each block. The result of a lookup in ucd_stage1 a "virtual" block
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# number.
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#
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# The ucd_stage2 table is a table of "virtual" blocks; each block is indexed by
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# the offset of a character within its own block, and the result is the index
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@ -165,15 +171,16 @@
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#
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# Example: lowercase "a" (U+0061) is in block 0
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# lookup 0 in stage1 table yields 0
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# lookup 97 (0x61) in the first table in stage2 yields 23
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# record 23 is { 20, 5, 12, 0, -32, 0, 9, 0 }
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# 20 = ucp_Latin => Latin script
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# lookup 97 (0x61) in the first table in stage2 yields 35
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# record 35 is { 0, 5, 12, 0, -32, 0, 9, 22, 0 }
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# 0 = ucp_Latin => Latin script
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# 5 = ucp_Ll => Lower case letter
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# 12 = ucp_gbOther => Grapheme break property "Other"
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# 0 => Not part of a caseless set
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# -32 (-0x20) => Other case is U+0041
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# 0 => No special Script Extension property
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# 9 = ucp_bidiL => Bidi class left-to-right
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# 22 => Offset to Boolean properties
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# 0 => Dummy value, unused at present
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#
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# Almost all lowercase latin characters resolve to the same record. One or two
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@ -181,36 +188,38 @@
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# example, k, K and the Kelvin symbol are such a set).
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#
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# Example: hiragana letter A (U+3042) is in block 96 (0x60)
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# lookup 96 in stage1 table yields 91
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# lookup 66 (0x42) in table 91 in stage2 yields 614
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# record 614 is { 17, 7, 12, 0, 0, 0, 9, 0 }
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# 17 = ucp_Hiragana => Hiragana script
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# lookup 96 in stage1 table yields 93
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# lookup 66 (0x42) in table 93 in stage2 yields 819
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# record 614 is { 20, 7, 12, 0, 0, 0, 9, 41, 0 }
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# 20 = ucp_Hiragana => Hiragana script
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# 7 = ucp_Lo => Other letter
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# 12 = ucp_gbOther => Grapheme break property "Other"
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# 0 => Not part of a caseless set
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# 0 => No other case
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# 0 => No special Script Extension property
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# 9 = ucp_bidiL => Bidi class left-to-right
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# 41 => Offset to Boolean properties
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# 0 => Dummy value, unused at present
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#
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# Example: vedic tone karshana (U+1CD0) is in block 57 (0x39)
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# lookup 57 in stage1 table yields 55
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# lookup 80 (0x50) in table 55 in stage2 yields 486
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# record 485 is { 78, 12, 3, 0, 0, 138, 13, 0 }
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# 78 = ucp_Inherited => Script inherited from predecessor
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# lookup 80 (0x50) in table 55 in stage2 yields 621
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# record 621 is { 84, 12, 3, 0, 0, 138, 13, 48, 0 }
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# 84 = ucp_Inherited => Script inherited from predecessor
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# 12 = ucp_Mn => Non-spacing mark
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# 3 = ucp_gbExtend => Grapheme break property "Extend"
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# 0 => Not part of a caseless set
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# 0 => No other case
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# 138 => Script Extension list offset = 138
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# 13 = ucp_bidiNSM => Bidi class non-spacing mark
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# 48 => Offset to Boolean properties
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# 0 => Dummy value, unused at present
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#
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# At offset 138 in the ucd_script_sets vector we find a bitmap with bits 1, 8,
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# 18, and 47 set. This means that this character is expected to be used with
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# any of those scripts, which are Bengali, Devanagari, Kannada, and Grantha.
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#
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# Philip Hazel, last updated 31 December 2021.
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# Philip Hazel, last updated 10 January 2022.
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##############################################################################
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@ -480,7 +489,7 @@ def write_bitsets(list, item_size):
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unicode_version = ""
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# Some of the tables imported from GenerateCommon.py have alternate comment
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# strings for use by GenerateUcpHeader. The comments are now wanted here, so
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# strings for use by GenerateUcpHeader. The comments are not wanted here, so
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# remove them.
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bidi_classes = bidi_classes[::2]
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@ -522,22 +531,18 @@ for line in file:
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break_props[i] = break_properties.index('Extended_Pictographic')
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file.close()
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# The Script Extensions property default value is the Script value. Parse the
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# file, setting 'Unknown' as the default (this will never be a Script Extension
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# value), then scan it and fill in the default from Scripts. Code added by PH
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# in October 2018. Positive values are used for just a single script for a
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# code point. Negative values are negated offsets in a list of bitsets of
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# multiple scripts. Initialize this list with a single entry, as the zeroth
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# element is never used.
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# Handle script extensions. The get_script_extesion() function maintains a
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# list of unique bitmaps representing lists of scripts, returning the offset
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# in that list. Initialize the list with an empty set, which is used for
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# characters that have no script extensions.
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script_lists = [[]]
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last_script_extension = ""
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scriptx = read_table('Unicode.tables/ScriptExtensions.txt', get_script_extension, 0)
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# Find the Boolean properties of each character. This next bit of magic creates
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# a list of empty lists. Just using [[]] * MAX_UNICODE gives a list of
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# references to the *same* list, which is not what we want.
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# a list of empty lists. Using [[]] * MAX_UNICODE gives a list of references to
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# the *same* list, which is not what we want.
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bprops = [[] for _ in range(MAX_UNICODE)]
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@ -601,7 +606,6 @@ for line in file:
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file.close()
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# Scan each character's boolean property list and created a list of unique
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# lists, at the same time, setting the index in that list for each property in
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# the bool_props vector.
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@ -620,7 +624,6 @@ for c in range(MAX_UNICODE):
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bool_props[c] = i
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# With the addition of the Script Extensions field, we needed some padding to
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# get the Unicode records up to 12 bytes (multiple of 4). Originally this was a
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# 16-bit field and padding_dummy[0] was set to 256 to ensure this, but 8 bits
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@ -793,7 +796,7 @@ const ucd_record PRIV(dummy_ucd_record)[] = {{
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0, /* other case */
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ucp_Unknown, /* script extension */
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ucp_bidiL, /* bidi class */
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0, /* bool properties offset */
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0, /* bool properties offset */
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0 /* dummy filler */
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}};
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#endif
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@ -864,14 +867,18 @@ for d in digitsets:
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f.write("\n};\n\n")
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f.write("""\
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/* This vector is a list of script bitsets for the Script Extension property. */
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/* This vector is a list of script bitsets for the Script Extension property.
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The number of 32-bit words in each bitset is #defined in pcre2_ucp.h as
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ucd_script_sets_item_size. */
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const uint32_t PRIV(ucd_script_sets)[] = {
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""")
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write_bitsets(script_lists, script_list_item_size)
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f.write("""\
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/* This vector is a list of bitsets for Boolean properties. */
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/* This vector is a list of bitsets for Boolean properties. The number of
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32_bit words in each bitset is #defined as ucd_boolprop_sets_item_size in
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pcre2_ucp.h. */
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const uint32_t PRIV(ucd_boolprop_sets)[] = {
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""")
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@ -42,7 +42,7 @@
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# Note subsequent changes here:
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#
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# 27-December-2021: Added support for 4-letter script abbreviations.
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# xx-January-2022: Further updates for Boolean property support
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# 10-January-2022: Further updates for Boolean property support
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# -----------------------------------------------------------------------------
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@ -112,20 +112,18 @@ utt_table += list(zip(std_category_names, category_names, ['PT_PC'] * len(catego
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utt_table += list(zip(std_general_category_names, general_category_names, ['PT_GC'] * len(general_category_names)))
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utt_table += list(zip(std_bidi_class_names, bidi_class_names, ['PT_BIDICL'] * len(bidi_class_names)))
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for name in bool_properties:
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utt_table.append((stdname(name), name, 'PT_BOOL'))
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if name in abbreviations:
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for abbrev in abbreviations[name]:
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utt_table.append((stdname(abbrev), name, 'PT_BOOL'))
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# Now add specials and synonyms. Note both the standardized and capitalized
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# forms are needed.
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utt_table.append(('any', 'Any', 'PT_ANY'))
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utt_table.append(('l&', 'L&', 'PT_LAMP'))
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utt_table.append(('lc', 'LC', 'PT_LAMP'))
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utt_table.append(('l&', 'L&', 'PT_LAMP'))
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utt_table.append(('lc', 'LC', 'PT_LAMP'))
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utt_table.append(('xan', 'Xan', 'PT_ALNUM'))
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utt_table.append(('xps', 'Xps', 'PT_PXSPACE'))
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utt_table.append(('xsp', 'Xsp', 'PT_SPACE'))
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67
maint/README
67
maint/README
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@ -22,13 +22,14 @@ GenerateCommon.py
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GenerateTest26.py
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A Python script that generates input and expected output test data for test
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26, which tests Unicode property support.
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26, which tests certain aspects of Unicode property support.
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GenerateUcd.py
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A Python script that generates the file pcre2_ucd.c from GenerateCommon.py
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and Unicode data files, which are themselves downloaded from the Unicode web
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site. The generated file contains the tables for a 2-stage lookup of Unicode
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properties, along with some auxiliary tables.
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properties, along with some auxiliary tables. The script starts with a long
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comment that gives details of the tables it constructs.
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GenerateUcpHeader.py
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A Python script that generates the file pcre2_ucp.h from GenerateCommon.py
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@ -38,7 +39,7 @@ GenerateUcpHeader.py
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GenerateUcpTables.py
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A Python script that generates the file pcre2_ucptables.c from
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GenerateCommon.py and Unicode data files. The generated file contains tables
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for looking up Unicode properties.
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for looking up Unicode property names.
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ManyConfigTests
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A shell script that runs "configure, make, test" a number of times with
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@ -63,11 +64,11 @@ Unicode.tables
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ScriptExtensions.txt are where to look for script information.
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ucptest.c
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A short C program for testing the Unicode property macros that do lookups in
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the pcre2_ucd.c data, mainly useful after rebuilding the Unicode property
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table. Compile and run this in the "maint" directory (see comments at its
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head). This program can also be used to find characters with specific
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properties.
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A program for testing the Unicode property macros that do lookups in the
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pcre2_ucd.c data, mainly useful after rebuilding the Unicode property tables.
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Compile and run this in the "maint" directory (see comments at its head).
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This program can also be used to find characters with specific properties and
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to list which properties are supported.
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ucptestdata
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A directory containing four files, testinput{1,2} and testoutput{1,2}, for
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@ -85,35 +86,18 @@ utf8.c
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Updating to a new Unicode release
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=================================
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**** WORK IN PROGRESS ****
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Work is going on in the area of Unicode property handling. What follows here is
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now out-of-date. It will be updated once the current project is complete.
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Updating to any new Unicode release is best left till then also.
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06-January-2022
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When there is a new release of Unicode, the files in Unicode.tables must be
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refreshed from the web site. If the new version of Unicode adds new character
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scripts, the lists in GenerateCommon.py must be updated. I have been adding
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each new group at the end of the relevant list, with a comment.
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refreshed from the web site. Once that is done, the four Python scripts that
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generate files from the Unicode data can be run from within the "maint"
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directory.
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NOTE: Both the pcre2syntax.3 and pcre2pattern.3 man pages contain lists of
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supported Unicode scripts that also have to be updated. These lists are in
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alphabetical order.
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Note: Previously, it was necessary to update lists of scripts and their
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abbreviations by hand before running the Python scripts. This is no longer
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necessary because the scripts have been upgraded to extract this information
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themselves. Also, there used to be explicit lists of script in two of the man
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pages. This is no longer the case.
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There are two lists in GenerateCommon.py: the full names and the abbreviations
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that are found in the ScriptExtensions.txt file. A list of script names and
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their abbreviations can be found in the PropertyValueAliases.txt file on the
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Unicode web site. There is also a Wikipedia page that lists them, and notes the
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Unicode version in which they were introduced:
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https://en.wikipedia.org/wiki/Unicode_scripts#Table_of_Unicode_scripts
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Once the script name lists have been updated, the three generator scripts can
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be run from within the maint directory. If you get the error "ValueError:
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list.index(x): x not in list", the cause is usually a missing (or misspelt)
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name in one of the lists. You can give an output file name as an argument, but
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You can give an output file name as an argument to the following scripts, but
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by default:
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GenerateUcd.py creates pcre2_ucd.c )
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@ -121,17 +105,18 @@ GenerateUcpHeader.py creates pcre2_ucp.h ) in the current directory
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GenerateUcpTables.py creates pcre2_ucptables.c )
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These files can be compared against the existing versions in the src directory
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to check on any changes before replacing the old files, but you can generate
|
||||
directly into the final location by running
|
||||
to check on any changes before replacing the old files, but you can also
|
||||
generate directly into the final location by running:
|
||||
|
||||
./GenerateUcd.py ../src/pcre2_ucd.c
|
||||
./GenerateUcpHeader.py ../src/pcre2_ucp.h
|
||||
./GenerateUcpTables.py ../src/pcre2_ucptables.c
|
||||
|
||||
The ucptest program can be compiled and used to check that the new tables work
|
||||
properly, using the data files in ucptestdata to check a number of test
|
||||
characters. See the comments at the start of ucptest.c. If there are new
|
||||
scripts, adding a few tests to the files in ucptestdata is a good idea.
|
||||
Once the .c and .h files are in the ../src directory, the ucptest program can
|
||||
be compiled and used to check that the new tables work properly. The data files
|
||||
in ucptestdata are set up to check a number of test characters. See the
|
||||
comments at the start of ucptest.c. If there are new scripts, adding a few
|
||||
tests to the files in ucptestdata is a good idea.
|
||||
|
||||
Finally, you should run the GenerateTest26.py script to regenerate new versions
|
||||
of the input and expected output from a series of Unicode property tests that
|
||||
|
|
@ -476,4 +461,4 @@ years.
|
|||
Philip Hazel
|
||||
Email local part: Philip.Hazel
|
||||
Email domain: gmail.com
|
||||
Last updated: 31 December 2021
|
||||
Last updated: 10 January 2022
|
||||
|
|
|
|||
|
|
@ -107,7 +107,7 @@ const ucd_record PRIV(dummy_ucd_record)[] = {{
|
|||
0, /* other case */
|
||||
ucp_Unknown, /* script extension */
|
||||
ucp_bidiL, /* bidi class */
|
||||
0, /* bool properties offset */
|
||||
0, /* bool properties offset */
|
||||
0 /* dummy filler */
|
||||
}};
|
||||
#endif
|
||||
|
|
@ -168,7 +168,9 @@ const uint32_t PRIV(ucd_digit_sets)[] = {
|
|||
0x1e959, 0x1fbf9,
|
||||
};
|
||||
|
||||
/* This vector is a list of script bitsets for the Script Extension property. */
|
||||
/* This vector is a list of script bitsets for the Script Extension property.
|
||||
The number of 32-bit words in each bitset is #defined in pcre2_ucp.h as
|
||||
ucd_script_sets_item_size. */
|
||||
|
||||
const uint32_t PRIV(ucd_script_sets)[] = {
|
||||
0x00000000u, 0x00000000u, 0x00000000u,
|
||||
|
|
@ -236,7 +238,9 @@ const uint32_t PRIV(ucd_script_sets)[] = {
|
|||
0x2000ffc0u, 0x3984a010u, 0x00000001u,
|
||||
};
|
||||
|
||||
/* This vector is a list of bitsets for Boolean properties. */
|
||||
/* This vector is a list of bitsets for Boolean properties. The number of
|
||||
32_bit words in each bitset is #defined as ucd_boolprop_sets_item_size in
|
||||
pcre2_ucp.h. */
|
||||
|
||||
const uint32_t PRIV(ucd_boolprop_sets)[] = {
|
||||
0x00000000u, 0x00000000u,
|
||||
|
|
|
|||
Loading…
Reference in New Issue