Crate icu::segmenter

Segment strings by lines, graphemes, words, and sentences.

This module is published as its own crate (icu_segmenter) and as part of the icu crate. See the latter for more details on the ICU4X project.

This module contains segmenter implementation for the following rules.

• Line segmenter that is compatible with Unicode Standard Annex #14, Unicode Line Breaking Algorithm, with options to tailor line-breaking behavior for CSS line-break and word-break properties.
• Grapheme cluster segmenter, word segmenter, and sentence segmenter that are compatible with Unicode Standard Annex #29, Unicode Text Segmentation.

Examples

Line Break

Find line break opportunities:

 use icu::segmenter::LineSegmenter;

 let segmenter = LineSegmenter::new_auto();

 let breakpoints: Vec<usize> = segmenter
     .segment_str("Hello World. Xin chào thế giới!")
     .collect();
 assert_eq!(&breakpoints, &[0, 6, 13, 17, 23, 29, 36]);

See LineSegmenter for more examples.

Grapheme Cluster Break

Find all grapheme cluster boundaries:

 use icu::segmenter::GraphemeClusterSegmenter;

 let segmenter = GraphemeClusterSegmenter::new();

 let breakpoints: Vec<usize> = segmenter
     .segment_str("Hello World. Xin chào thế giới!")
     .collect();
 assert_eq!(
     &breakpoints,
     &[
         0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
         19, 21, 22, 23, 24, 25, 28, 29, 30, 31, 34, 35, 36
     ]
 );

See GraphemeClusterSegmenter for more examples.

Word Break

Find all word boundaries:

 use icu::segmenter::WordSegmenter;

 let segmenter = WordSegmenter::new_auto();

 let breakpoints: Vec<usize> = segmenter
     .segment_str("Hello World. Xin chào thế giới!")
     .collect();
 assert_eq!(
     &breakpoints,
     &[0, 5, 6, 11, 12, 13, 16, 17, 22, 23, 28, 29, 35, 36]
 );

See WordSegmenter for more examples.

Sentence Break

Segment the string into sentences:

 use icu::segmenter::SentenceSegmenter;

 let segmenter = SentenceSegmenter::new();

 let breakpoints: Vec<usize> = segmenter
     .segment_str("Hello World. Xin chào thế giới!")
     .collect();
 assert_eq!(&breakpoints, &[0, 13, 36]);

See SentenceSegmenter for more examples.

Modules

• provider
  🚧 [Unstable] Data provider struct definitions for this ICU4X component.

Structs

• GraphemeClusterBreakIterator
  Implements the Iterator trait over the grapheme cluster boundaries of the given string.
• GraphemeClusterSegmenter
  Segments a string into grapheme clusters.
• LineBreakIterator
  Implements the Iterator trait over the line break opportunities of the given string.
• LineBreakOptions
  Options to tailor line-breaking behavior.
• LineSegmenter
  Supports loading line break data, and creating line break iterators for different string encodings.
• SentenceBreakIterator
  Implements the Iterator trait over the sentence boundaries of the given string.
• SentenceSegmenter
  Supports loading sentence break data, and creating sentence break iterators for different string encodings.
• WordBreakIterator
  Implements the Iterator trait over the word boundaries of the given string.
• WordSegmenter
  Supports loading word break data, and creating word break iterators for different string encodings.

Enums

• Error
  A list of error outcomes for various operations in this module.
• LineBreakStrictness
  An enum specifies the strictness of line-breaking rules. It can be passed as an argument when creating a line segmenter.
• LineBreakWordOption
  An enum specifies the line break opportunities between letters. It can be passed as an argument when creating a line segmenter.
• SegmenterError
  A list of error outcomes for various operations in this module.
• WordType
  The word type tag that is returned by WordBreakIterator::word_type().

Type Aliases

• GraphemeClusterBreakIteratorLatin1
  Grapheme cluster break iterator for a Latin-1 (8-bit) string.
• GraphemeClusterBreakIteratorPotentiallyIllFormedUtf8
  Grapheme cluster break iterator for a potentially invalid UTF-8 string.
• GraphemeClusterBreakIteratorUtf8
  Grapheme cluster break iterator for an str (a UTF-8 string).
• GraphemeClusterBreakIteratorUtf16
  Grapheme cluster break iterator for a UTF-16 string.
• LineBreakIteratorLatin1
  Line break iterator for a Latin-1 (8-bit) string.
• LineBreakIteratorPotentiallyIllFormedUtf8
  Line break iterator for a potentially invalid UTF-8 string.
• LineBreakIteratorUtf8
  Line break iterator for an str (a UTF-8 string).
• LineBreakIteratorUtf16
  Line break iterator for a UTF-16 string.
• SentenceBreakIteratorLatin1
  Sentence break iterator for a Latin-1 (8-bit) string.
• SentenceBreakIteratorPotentiallyIllFormedUtf8
  Sentence break iterator for a potentially invalid UTF-8 string.
• SentenceBreakIteratorUtf8
  Sentence break iterator for an str (a UTF-8 string).
• SentenceBreakIteratorUtf16
  Sentence break iterator for a UTF-16 string.
• WordBreakIteratorLatin1
  Word break iterator for a Latin-1 (8-bit) string.
• WordBreakIteratorPotentiallyIllFormedUtf8
  Word break iterator for a potentially invalid UTF-8 string.
• WordBreakIteratorUtf8
  Word break iterator for an str (a UTF-8 string).
• WordBreakIteratorUtf16
  Word break iterator for a UTF-16 string.