unicode_data — The Logtalk Handbook v3.47.0 documentation

# `unicode_data`

VivoMind Prolog Unicode Resources

## Authors

Arun Majumdar @ VivoMind LLC
Paulo Moura @ VivoMind LLC

## License

Creative Commons CC0 1.0 Universal (CC0 1.0) - Public Domain Dedication:

http://creativecommons.org/publicdomain/zero/1.0/

We do appreciate acknowledgement if you use these resources, however, and we also welcome contributions to improve them.

## Website

The latest release of the VivoMind Prolog Unicode Resources is available at the URL:

https://github.com/VivoMind

At this address you can also find additional information about the VivoMind Prolog Unicode Resources and submit your bug reports and contributions.

## Description

The VivoMind Prolog Unicode Resources are a set of files resulting from the conversion of most (but not all) official UCD 6.1 files and updated for the few changes in the 6.2 standard. The original files can be downloaded from:

http://www.unicode.org

The conversion of the UCD files resulted in a large number of Prolog tables and also a set of auxiliary predicates (described below) for accessing these tables. Other than the obvious conversion in the provided predicate names, no attempt was made to convert the identifiers used for properties and other data.

## Requirements

Most of the auxiliary predicates assume that the de facto Prolog standard predicate `between/3` is available. Unicode code point values are represented using the ISO Prolog standard notation for hexadecimal integers. In addition, the ISO Prolog standard directives `include/1` and `ensure_loaded/1` are used in some of the files to load auxiliary files.

## Usage

Most applications only require some of the tables present in these resources. Most of these tables define properties for ranges of code points and not for single code points but the provided auxiliary predicates allow access for a single code point. When increased performance is required, consider using the existing tables and auxiliary predicates to generated derived tables more fit for your specific application.

## Known issues

In the file `unicode_unihan_variant.pl`, when there’s more than one variant for a code point, only the first one (as listed in the original UCD file) is returned.

The `include/1` and `ensure_loaded/1` directives are specified in the ISO Prolog standard published in 1995. But some Prolog compilers either don’t implement one or both directives or have flawed implementations. Thus, you may need to change how some of the files are loaded depending on the chosen Prolog compiler. Using conditional compilation directives would help in some cases but it would also rise portability issues on their own.

## Acknowledgements

We thank Richard O’Keefe for helpful suggestions to improve the usability of these resources.

## Files and API Summary

The Prolog file names are derived from the original file names by prefixing them with the `unicode_` string, converting to lower case, and replacing the camel case spelling with underscores. There are, however, two exceptions: the files and directories holding the code point categories and names.

There’s also an utility file, `unicode_data.pl`, that can be used to load all the files in these resources. Is mostly used to test portability of the code across Prolog compilers. Also included is a Logtalk version of this file, `unicode_data.lgt`, that uses Logtalk’s own implementation of the `include/1` directive and the `logtak_load/1` predicate to load all files. This file can be used to workaround Prolog systems with buggy or missing implementations of the `ensure_loaded/1` and `include/1` directives.

An overview of the original file names and the code point properties can be found at:

http://www.unicode.org/reports/tr44/#Directory_Structure
http://www.unicode.org/reports/tr44/#Property_Definitions

### `unicode_arabic_shaping.pl`

- Provides: `unicode_arabic_shaping/4`

- Dependencies: (none)

### `unicode_bidi_mirroring.pl`

- Provides: `unicode_bidi_mirroring/2`

- Dependencies: (none)

### `unicode_blocks.pl`

- Provides: `unicode_block/2-3`

- Dependencies: (none)

### `unicode_case_folding.pl`

- Provides: `unicode_case_folding/3`

- Dependencies: (none)

### `unicode_categories.pl`

- Provides: `unicode_category/2`

- Dependencies: files in the `unicode_categories` directory

### `unicode_cjk_radicals.pl`

- Provides: `unicode_cjk_radical/3`

- Dependencies: (none)

### `unicode_composition_exclusions.pl`

- Provides: `unicode_composition_exclusion/1`

- Dependencies: (none)

### `unicode_core_properties.pl`

- Provides: `unicode_math/1-2` `unicode_alphabetic/1-2` `unicode_range_alphabetic/2` `unicode_lowercase/1-2` `unicode_uppercase/1-2` `unicode_cased/1-2` `unicode_case_ignorable/1-2` `unicode_changes_when_lowercased/1-2` `unicode_changes_when_uppercased/1-2` `unicode_changes_when_titlecased/1-2` `unicode_changes_when_casefolded/1-2` `unicode_changes_when_casemapped/1-2` `unicode_id_start/1-2` `unicode_id_continue/1-2` `unicode_xid_start/1-2` `unicode_xid_continue/1-2` `unicode_default_ignorable/1-2` `unicode_grapheme_extend/1-2` `unicode_grapheme_base/1-2` `unicode_grapheme_link/1-2`

- Dependencies: files in the `unicode_core_properties` directory

### `unicode_decomposition_type.pl`

- Provides: `unicode_canonical/1-2` `unicode_compat/1-2` `unicode_font/1-2` `unicode_nobreak/1-2` `unicode_initial/1-2` `unicode_medial/1-2` `unicode_final/1-2` `unicode_isolated/1-2` `unicode_circle/1-2` `unicode_super/1-2` `unicode_sub/1-2` `unicode_vertical/1-2` `unicode_wide/1-2` `unicode_narrow/1-2` `unicode_small/1-2` `unicode_square/1-2` `unicode_fraction/1-2`

- Dependencies: files in the `unicode_decomposition_type` directory

### `unicode_derived_age.pl`

- Provides: `unicode_age/2-3`

- Dependencies: (none)

### `unicode_derived_bidi_class.pl`

- Provides: `unicode_bidi_class/2-3`

- Dependencies: (none)

### `unicode_derived_combining_class.pl`

- Provides: `unicode_combining_class/2-3`

- Dependencies: (none)

### `unicode_derived_core_properties.pl`

- Provides: `unicode_core_property/2-3`

- Dependencies: (none)

### `unicode_derived_decomposition_type.pl`

- Provides: `unicode_decomposition_type/2-3`

- Dependencies: (none)

### `unicode_derived_east_asian_width.pl`

- Provides: `unicode_east_asian_width/2-3`

- Dependencies: (none)

### `unicode_derived_joining_group.pl`

- Provides: `unicode_joining_group/2-3`

- Dependencies: (none)

### `unicode_derived_joining_type.pl`

- Provides: `unicode_joining_type/2-3`

- Dependencies: (none)

### `unicode_derived_line_break.pl`

- Provides: `unicode_line_break/2-3`

- Dependencies: (none)

### `unicode_derived_normalization_props.pl`

- Provides: `unicode_fc_nfkc/2` `unicode_nfkc_cf/2` `unicode_full_composition_exclusion/1-2` `unicode_nfd_qc_no/1-2` `unicode_nfc_qc_no/1-2` `unicode_nfc_qc_maybe/1-2` `unicode_nfkd_qc_no/1-2` `unicode_nfkc_qc_no/1-2` `unicode_nfkc_qc_maybe/1-2` `unicode_expands_on_nfd/1-2` `unicode_expands_on_nfc/1-2` `unicode_expands_on_nfkd/1-2` `unicode_expands_on_nfkc/1-2` `unicode_changes_when_nfkc_casefolded/1-2`

- Dependencies: files in the `unicode_derived_normalization_props` directory

### `unicode_derived_numeric_type.pl`

- Provides: `unicode_numeric_type/2-3`

- Dependencies: (none)

### `unicode_derived_numeric_values.pl`

- Provides: `unicode_numerical_value/3`

- Dependencies: (none)

### `unicode_hangul_syllable_type.pl`

- Provides: `unicode_hangul_syllable_type/2-3`

- Dependencies: (none)

### `unicode_indic_matra_category.pl`

- Provides: `unicode_indic_matra_category/2-3`

- Dependencies: (none)

### `unicode_indic_syllabic_category.pl`

- Provides: `unicode_indic_syllabic_category/2-3`

- Dependencies: (none)

### `unicode_jamo.pl`

- Provides: `unicode_jamo/2`

- Dependencies: (none)

### `unicode_name_aliases.pl`

- Provides: `unicode_name_alias/3`

- Dependencies: (none)

### `unicode_names.pl`

- Provides: `unicode_name/2`

- Dependencies: files in the `unicode_names` directory

### `unicode_prop_list.pl`

- Provides: `unicode_white_space/1-2` `unicode_bidi_control/1-2` `unicode_join_control/1-2` `unicode_dash/1-2` `unicode_hyphen/1-2` `unicode_quotation_mark/1-2` `unicode_terminal_punctuation/1-2` `unicode_other_math/1-2` `unicode_hex_digit/1-2` `unicode_ascii_hex_digit/1-2` `unicode_other_alphabetic/1-2` `unicode_ideographic/1-2` `unicode_diacritic/1-2` `unicode_extender/1-2` `unicode_other_lowercase/1-2` `unicode_other_uppercase/1-2` `unicode_noncharacter_code_point/1-2` `unicode_other_grapheme_extend/1-2` `unicode_ids_binary_operator/1-2` `unicode_ids_trinary_operator/1-2` `unicode_radical/1-2` `unicode_unified_ideograph/1-2` `unicode_other_default_ignorable/1-2` `unicode_deprecated/1-2` `unicode_soft_dotted/1-2` `unicode_logical_order_exception/1-2` `unicode_other_id_start/1-2` `unicode_other_id_continue/1-2` `unicode_sterm/1-2` `unicode_variation_selector/1-2` `unicode_pattern_white_space/1-2` `unicode_pattern_syntax/1-2`

- Dependencies: files in the `unicode_prop_list` directory

### `unicode_range_scripts.pl`

- Provides: `unicode_range_script/3` `unicode_script/2`

- Dependencies: (none)

### `unicode_script_extensions.pl`

- Provides: `unicode_script_extension/2-3`

- Dependencies: `unicode_scripts.pl`

### `unicode_scripts.pl`

- Provides: `unicode_script/6` `unicode_script_category/3`

- Dependencies: (none)

### `unicode_special_casing.pl`

- Provides: `unicode_special_casing/5`

- Dependencies: (none)

### `unicode_unihan_variants.pl`

- Provides: `unicode_unihan_variant/2-3`

- Dependencies: (none)

### `unicode_version.pl`

- Provides: `unicode_version/3`

- Dependencies: (none)