stri_opts_brkiter: Generate a List with BreakIterator Settings

Description

A convenience function to tune the ICU BreakIterator's behavior in some text boundary analysis functions, see stringi-search-boundaries.

Usage

stri_opts_brkiter(type, locale, skip_word_none, skip_word_number,
  skip_word_letter, skip_word_kana, skip_word_ideo, skip_line_soft,
  skip_line_hard, skip_sentence_term, skip_sentence_sep, ...)

Arguments

type

single string; either the break iterator type, one of character, line_break, sentence, word; or a custom set of ICU break iteration rules. see stringi-search-boundaries

locale

single string, NULL or "" for default locale

skip_word_none

logical; perform no action for "words" that do not fit into any other categories

skip_word_number

logical; perform no action for words that appear to be numbers

skip_word_letter

logical; perform no action for words that contain letters, excluding hiragana, katakana, or ideographic characters

skip_word_kana

logical; perform no action for words containing kana characters

skip_word_ideo

logical; perform no action for words containing ideographic characters

skip_line_soft

logical; perform no action for soft line breaks, i.e. positions at which a line break is acceptable but not required

skip_line_hard

logical; perform no action for hard, or mandatory line breaks

skip_sentence_term

logical; perform no action for sentences ending with a sentence terminator (".", ",", "?", "!"), possibly followed by a hard separator (CR, LF, PS, etc.)

skip_sentence_sep

logical; perform no action for sentences that do not contain an ending sentence terminator, but are ended by a hard separator or end of input

...

any other arguments to this function are purposely ignored

Value

Returns a named list object. Omitted skip_* values act as they have been set to FALSE.

Details

The skip_* family of settings may be used to prevent performing any special actions on particular types of text boundaries, e.g. in case of the stri_locate_all_boundaries and stri_split_boundaries functions.

Note that custom break iterator rules (advanced users only) should be specified as a single string. For a detailed description of the syntax of RBBI rules, please refer to the ICU User Guide on Boundary Analysis.

References

ubrk.h File Reference -- ICU4C API Documentation, http://icu-project.org/apiref/icu4c/ubrk_8h.html

Boundary Analysis -- ICU User Guide, http://userguide.icu-project.org/boundaryanalysis