Documentation update for Script Extensions property coding.
This commit is contained in:
Philip.Hazel
parent
04ba4bce0f
commit
83726c359d
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@ -8,26 +8,28 @@
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# the upgrading of Unicode property support. The new code speeds up property
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# matching many times. The script is for the use of PCRE maintainers, to
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# generate the pcre2_ucd.c file that contains a digested form of the Unicode
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# data tables.
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# data tables. A number of extensions have been added to the original script.
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#
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# The script has now been upgraded to Python 3 for PCRE2, and should be run in
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# the maint subdirectory, using the command
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#
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# [python3] ./MultiStage2.py >../src/pcre2_ucd.c
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#
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# It requires five Unicode data tables: DerivedGeneralCategory.txt,
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# GraphemeBreakProperty.txt, Scripts.txt, CaseFolding.txt, and emoji-data.txt.
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# These must be in the maint/Unicode.tables subdirectory.
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# It requires six Unicode data tables: DerivedGeneralCategory.txt,
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# GraphemeBreakProperty.txt, Scripts.txt, ScriptExtensions.txt,
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# CaseFolding.txt, and emoji-data.txt. These must be in the
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# maint/Unicode.tables subdirectory.
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#
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# DerivedGeneralCategory.txt is found in the "extracted" subdirectory of the
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# Unicode database (UCD) on the Unicode web site; GraphemeBreakProperty.txt is
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# in the "auxiliary" subdirectory. Scripts.txt and CaseFolding.txt are directly
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# in the UCD directory. The emoji-data.txt file is in files associated with
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# Unicode Technical Standard #51 ("Unicode Emoji"), for example:
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#
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# http://unicode.org/Public/emoji/11.0/emoji-data.txt
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# in the "auxiliary" subdirectory. Scripts.txt, ScriptExtensions.txt, and
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# CaseFolding.txt are directly in the UCD directory. The emoji-data.txt file is
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# in files associated with Unicode Technical Standard #51 ("Unicode Emoji"),
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# for example:
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#
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# http://unicode.org/Public/emoji/11.0/emoji-data.txt
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#
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# -----------------------------------------------------------------------------
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# Minor modifications made to this script:
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# Added #! line at start
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# Removed tabs
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@ -61,78 +63,8 @@
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# property, which is used by PCRE2 as a grapheme breaking property. This was
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# done when updating to Unicode 11.0.0 (July 2018).
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#
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# Added code to add a Script Extensions field to records.
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#
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#
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# The main tables generated by this script are used by macros defined in
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# pcre2_internal.h. They look up Unicode character properties using short
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# sequences of code that contains no branches, which makes for greater speed.
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#
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# Conceptually, there is a table of records (of type ucd_record), containing a
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# script number, script extension value, character type, grapheme break type,
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# offset to caseless matching set, offset to the character's other case, for
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# every character. However, a real table covering all Unicode characters would
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# be far too big. It can be efficiently compressed by observing that many
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# characters have the same record, and many blocks of characters (taking 128
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# characters in a block) have the same set of records as other blocks. This
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# leads to a 2-stage lookup process.
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#
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# This script constructs six 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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# that are not part of any list.
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#
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# The ucd_digit_sets table contains the code points of the '9' characters in
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# each set of 10 decimal digits in Unicode. This is used to ensure that digits
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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 ucd_script_sets vector contains lists of script numbers that are the
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# Script Extensions properties of certain characters. Each list is terminated
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# by zero (ucp_Unknown). A character with more than one script listed for its
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# Script Extension property has a negative value in its record. This is the
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# negated offset to the start of the relevant list.
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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, and
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# yields what is in effect a "virtual" block number. The ucd_stage2 table is a
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# table of "virtual" blocks; each block is indexed by the offset of a character
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# within its own block, and the result is the offset of the required record.
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#
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# The following examples are correct for the Unicode 11.0.0 database. Future
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# updates may make change the actual lookup values.
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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 in the first table in stage2 yields 16
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# record 17 is { 33, 5, 11, 0, -32 }
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# 33 = 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 => Other case is U+0041
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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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# are different because they are part of a multi-character caseless set (for
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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 90
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# lookup 66 in the 90th table in stage2 yields 515
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# record 515 is { 26, 7, 11, 0, 0 }
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# 26 = 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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#
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# In these examples, no other blocks resolve to the same "virtual" block, as it
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# happens, but plenty of other blocks do share "virtual" blocks.
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#
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# Philip Hazel, 03 July 2008
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# Last Updated: 03 October 2018
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#
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# Added code to add a Script Extensions field to records. This has increased
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# their size from 8 to 12 bytes, only 10 of which are currently used.
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#
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# 01-March-2010: Updated list of scripts for Unicode 5.2.0
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# 30-April-2011: Updated list of scripts for Unicode 6.0.0
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@ -155,6 +87,98 @@
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# Pictographic property.
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# 01-October-2018: Added the 'Unknown' script name
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# 03-October-2018: Added new field for Script Extensions
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# ----------------------------------------------------------------------------
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#
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#
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# The main tables generated by this script are used by macros defined in
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# pcre2_internal.h. They look up Unicode character properties using short
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# sequences of code that contains no branches, which makes for greater speed.
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#
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# Conceptually, there is a table of records (of type ucd_record), containing a
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# script number, script extension value, character type, grapheme break type,
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# offset to caseless matching set, offset to the character's other case, for
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# every Unicode character. However, a real table covering all Unicode
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# characters would be far too big. It can be efficiently compressed by
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# observing that many characters have the same record, and many blocks of
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# characters (taking 128 characters in a block) have the same set of records as
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# other blocks. This leads to a 2-stage lookup process.
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#
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# This script constructs six 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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# that are not part of any list.
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#
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# The ucd_digit_sets table contains the code points of the '9' characters in
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# each set of 10 decimal digits in Unicode. This is used to ensure that digits
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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 ucd_script_sets vector contains lists of script numbers that are the
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# Script Extensions properties of certain characters. Each list is terminated
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# by zero (ucp_Unknown). A character with more than one script listed for its
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# Script Extension property has a negative value in its record. This is the
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# negated offset to the start of the relevant list in the ucd_script_sets
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# vector.
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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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#
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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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# number of the required record in the ucd_records vector.
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#
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# The following examples are correct for the Unicode 11.0.0 database. Future
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# updates may make change the actual lookup values.
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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 17
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# record 17 is { 34, 5, 12, 0, -32, 34, 0 }
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# 34 = 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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# 34 = ucp_Latin => No special Script Extension property
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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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# are different because they are part of a multi-character caseless set (for
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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 90
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# lookup 66 (0x42) in table 90 in stage2 yields 564
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# record 564 is { 27, 7, 12, 0, 0, 27, 0 }
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# 27 = 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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# 27 = ucp_Hiragana => No special Script Extension property
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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 458
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# record 458 is { 28, 12, 3, 0, 0, -101, 0 }
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# 28 = 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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# -101 => Script Extension list offset = 101
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# 0 => Dummy value, unused at present
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#
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# At offset 101 in the ucd_script_sets vector we find the list 3, 15, 107, 29,
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# and terminator 0. This means that this character is expected to be used with
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# any of those scripts, which are Bengali, Devanagari, Grantha, and Kannada.
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#
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# Philip Hazel, 03 July 2008
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# Last Updated: 07 October 2018
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##############################################################################
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@ -175,13 +199,13 @@ def get_other_case(chardata):
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if chardata[1] == 'C' or chardata[1] == 'S':
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return int(chardata[2], 16) - int(chardata[0], 16)
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return 0
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# Parse a line of ScriptExtensions.txt
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def get_script_extension(chardata):
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this_script_list = list(chardata[1].split(' '))
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if len(this_script_list) == 1:
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return script_abbrevs.index(this_script_list[0])
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script_numbers = []
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for d in this_script_list:
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script_numbers.append(script_abbrevs.index(d))
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@ -190,18 +214,18 @@ def get_script_extension(chardata):
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for i in range(1, len(script_lists) - script_numbers_length + 1):
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for j in range(0, script_numbers_length):
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found = True
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found = True
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if script_lists[i+j] != script_numbers[j]:
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found = False
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found = False
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break
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if found:
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return -i
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# Not found in existing lists
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# Not found in existing lists
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return_value = len(script_lists)
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script_lists.extend(script_numbers)
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return -return_value
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return -return_value
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# Read the whole table in memory, setting/checking the Unicode version
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def read_table(file_name, get_value, default_value):
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@ -402,7 +426,7 @@ script_names = ['Unknown', 'Arabic', 'Armenian', 'Bengali', 'Bopomofo', 'Braille
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'Dogra', 'Gunjala_Gondi', 'Hanifi_Rohingya', 'Makasar', 'Medefaidrin',
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'Old_Sogdian', 'Sogdian'
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]
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script_abbrevs = [
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'Zzzz', 'Arab', 'Armn', 'Beng', 'Bopo', 'Brai', 'Bugi', 'Buhd', 'Cans',
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'Cher', 'Zyyy', 'Copt', 'Cprt', 'Cyrl', 'Dsrt', 'Deva', 'Ethi', 'Geor',
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@ -434,7 +458,7 @@ script_abbrevs = [
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'Zanb',
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#New for Unicode 11.0.0
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'Dogr', 'Gong', 'Rohg', 'Maka', 'Medf', 'Sogo', 'Sogd'
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]
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]
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category_names = ['Cc', 'Cf', 'Cn', 'Co', 'Cs', 'Ll', 'Lm', 'Lo', 'Lt', 'Lu',
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'Mc', 'Me', 'Mn', 'Nd', 'Nl', 'No', 'Pc', 'Pd', 'Pe', 'Pf', 'Pi', 'Po', 'Ps',
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@ -499,10 +523,10 @@ scriptx = read_table('Unicode.tables/ScriptExtensions.txt', get_script_extension
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for i in range(0, MAX_UNICODE):
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if scriptx[i] == script_abbrevs_default:
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scriptx[i] = script[i]
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scriptx[i] = script[i]
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# With the addition of the new Script Extensions field, we need some padding
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# to get the Unicode records up to 12 bytes (multiple of 4). Set a value
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# With the addition of the new Script Extensions field, we need some padding
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# to get the Unicode records up to 12 bytes (multiple of 4). Set a value
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# greater than 255 to make the field 16 bits.
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padding_dummy = [0] * MAX_UNICODE
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@ -690,11 +714,11 @@ for line in file:
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m = re.match(r'([0-9a-fA-F]+)\.\.([0-9a-fA-F]+)\s+;\s+\S+\s+#\s+Nd\s+', line)
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if m is None:
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continue
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first = int(m.group(1),16)
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last = int(m.group(2),16)
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first = int(m.group(1),16)
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last = int(m.group(2),16)
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if ((last - first + 1) % 10) != 0:
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print("ERROR: %04x..%04x does not contain a multiple of 10 characters" % (first, last),
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file=sys.stderr)
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file=sys.stderr)
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while first < last:
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digitsets.append(first + 9)
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first += 10
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@ -724,9 +748,9 @@ count = 0
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print(" /* 0 */", end='')
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for d in script_lists:
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print(" %3d," % d, end='')
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count += 1
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count += 1
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if d == 0:
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print("\n /* %3d */" % count, end='')
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print("\n /* %3d */" % count, end='')
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print("\n};\n")
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# Output the main UCD tables.
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82
maint/README
82
maint/README
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@ -23,11 +23,12 @@ GenerateUtt.py A Python script to generate part of the pcre2_tables.c file
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ManyConfigTests A shell script that runs "configure, make, test" a number of
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times with different configuration settings.
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MultiStage2.py A Python script that generates the file pcre2_ucd.c from five
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Unicode data tables, which are themselves downloaded from the
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MultiStage2.py A Python script that generates the file pcre2_ucd.c from six
|
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Unicode data files, which are themselves downloaded from the
|
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Unicode web site. Run this script in the "maint" directory.
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The generated file contains the tables for a 2-stage lookup
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of Unicode properties.
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The generated file is written to stdout. It contains the
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tables for a 2-stage lookup of Unicode properties, along with
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some auxiliary tables.
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pcre2_chartables.c.non-standard
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This is a set of character tables that came from a Windows
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@ -40,14 +41,15 @@ README This file.
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Unicode.tables The files in this directory were downloaded from the Unicode
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web site. They contain information about Unicode characters
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and scripts. The ones used by the MultiStage2.py script are
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CaseFolding.txt, DerivedGeneralCategory.txt, Scripts.txt,
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GraphemeBreakProperty.txt, and emoji-data.txt. I've kept
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UnicodeData.txt (which is no longer used by the script)
|
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because it is useful occasionally for manually looking up the
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details of certain characters. However, note that character
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names in this file such as "Arabic sign sanah" do NOT mean
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that the character is in a particular script (in this case,
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Arabic). Scripts.txt is where to look for script information.
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CaseFolding.txt, DerivedGeneralCategory.txt, Scripts.txt,
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ScriptExtensions.txt, GraphemeBreakProperty.txt, and
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emoji-data.txt. I've kept UnicodeData.txt (which is no longer
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used by the script) because it is useful occasionally for
|
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manually looking up the details of certain characters.
|
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However, note that character names in this file such as
|
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"Arabic sign sanah" do NOT mean that the character is in a
|
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particular script (in this case, Arabic). Scripts.txt and
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ScriptExtensions.txt are where to look for script information.
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ucptest.c A short C program for testing the Unicode property macros
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that do lookups in the pcre2_ucd.c data, mainly useful after
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@ -61,7 +63,7 @@ utf8.c A short, freestanding C program for converting a Unicode code
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point into a sequence of bytes in the UTF-8 encoding, and vice
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versa. If its argument is a hex number such as 0x1234, it
|
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outputs a list of the equivalent UTF-8 bytes. If its argument
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is sequence of concatenated UTF-8 bytes (e.g. e188b4) it
|
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is a sequence of concatenated UTF-8 bytes (e.g. e188b4) it
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treats them as a UTF-8 character and outputs the equivalent
|
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code point in hex.
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@ -72,25 +74,31 @@ Updating to a new Unicode release
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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 source file pcre2_ucp.h and both the MultiStage2.py and the
|
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GenerateUtt.py scripts must be edited to add the new names. Then MultiStage2.py
|
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can be run to generate a new version of pcre2_ucd.c, and GenerateUtt.py can be
|
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run to generate the tricky tables for inclusion in pcre2_tables.c.
|
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GenerateUtt.py scripts must be edited to add the new names. I have been adding
|
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each new group at the end of the relevant list, with a comment. Note also that
|
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both the pcre2syntax.3 and pcre2pattern.3 man pages contain lists of Unicode
|
||||
script names.
|
||||
|
||||
If MultiStage2.py gives the error "ValueError: list.index(x): x not in list",
|
||||
the cause is usually a missing (or misspelt) name in the list of scripts. I
|
||||
couldn't find a straightforward list of scripts on the Unicode site, but
|
||||
there's a useful Wikipedia page that lists them, and notes the Unicode version
|
||||
in which they were introduced:
|
||||
MultiStage2.py has two lists: the full names and the abbreviations that are
|
||||
found in the ScriptExtensions.txt file. A list of script names and their
|
||||
abbreviations s can be found in the PropertyValueAliases.txt file on the
|
||||
Unicode web site. There is also a Wikipedia page that lists them, and notes the
|
||||
Unicode version in which they were introduced:
|
||||
|
||||
http://en.wikipedia.org/wiki/Unicode_scripts#Table_of_Unicode_scripts
|
||||
|
||||
Once the script name lists have been updated, MultiStage2.py can be run to
|
||||
generate a new version of pcre2_ucd.c, and GenerateUtt.py can be run to
|
||||
generate the tricky tables for inclusion in pcre2_tables.c (which must be
|
||||
hand-edited). If MultiStage2.py gives the error "ValueError: list.index(x): x
|
||||
not in list", the cause is usually a missing (or misspelt) name in one of the
|
||||
lists of scripts.
|
||||
|
||||
The ucptest program can be compiled and used to check that the new tables in
|
||||
pcre2_ucd.c work properly, using the data files in ucptestdata to check a
|
||||
number of test characters. The source file ucptest.c must be updated whenever
|
||||
new Unicode script names are added.
|
||||
|
||||
Note also that both the pcre2syntax.3 and pcre2pattern.3 man pages contain
|
||||
lists of Unicode script names.
|
||||
number of test characters. The source file ucptest.c should also be updated
|
||||
whenever new Unicode script names are added, and adding a few tests for new
|
||||
scripts is a good idea.
|
||||
|
||||
|
||||
Preparing for a PCRE2 release
|
||||
|
|
@ -401,26 +409,6 @@ very sensible; some are rather wacky. Some have been on this list for years.
|
|||
strings, at least one of which must be present for a match, efficient
|
||||
pre-searching of large datasets could be implemented.
|
||||
|
||||
. There's a Perl proposal for some new (* things, including alpha synonyms for
|
||||
the lookaround assertions:
|
||||
|
||||
(*pla: …)
|
||||
(*plb: …)
|
||||
(*nla: …)
|
||||
(*nlb: …)
|
||||
(*atomic: …)
|
||||
(*positive_look_ahead:...)
|
||||
(*negative_look_ahead:...)
|
||||
(*positive_look_behind:...)
|
||||
(*negative_look_behind:...)
|
||||
|
||||
Also a new one (with synonyms):
|
||||
|
||||
(*script_run: ...) Ensure all captured chars are in the same script
|
||||
(*sr: …)
|
||||
(*atomic_script_run: …) A combination of script_run and atomic
|
||||
(*asr:...)
|
||||
|
||||
. If pcre2grep had --first-line (match only in the first line) it could be
|
||||
efficiently used to find files "starting with xxx". What about --last-line?
|
||||
|
||||
|
|
@ -441,4 +429,4 @@ very sensible; some are rather wacky. Some have been on this list for years.
|
|||
Philip Hazel
|
||||
Email local part: ph10
|
||||
Email domain: cam.ac.uk
|
||||
Last updated: 21 August 2018
|
||||
Last updated: 07 October 2018
|
||||
|
|
|
|||
Loading…
Reference in New Issue