Public Interface¶

Constructors

new (STRING, [KEY => VALUE, ...])

new (STRING, [LINEBREAK])

Constructor. Create new grapheme cluster string (Unicode::GCString object) from Unicode string STRING.

About optional KEY => VALUE pairs see "Options" in Unicode::LineBreak. On second form, Unicode::LineBreak object LINEBREAK controls breaking features.

Note: The first form was introduced by release 2012.10.

copy

Copy constructor. Create a copy of grapheme cluster string. Next position of new string is set at beginning.

Sizes

chars

Instance method. Returns number of Unicode characters grapheme cluster string includes, i.e. length as Unicode string.

columns

Instance method. Returns total number of columns of grapheme clusters defined by built-in character database. For more details see "DESCRIPTION" in Unicode::LineBreak.

length

Instance method. Returns number of grapheme clusters contained in grapheme cluster string.

Operations as String

as_string

"""OBJECT"""

Instance method. Convert grapheme cluster string to Unicode string explicitly.

cmp (STRING)

STRING "cmp" STRING

Instance method. Compare strings. There are no oddities. One of each STRING may be Unicode string.

concat (STRING)

STRING "." STRING

Instance method. Concatenate STRINGs. One of each STRING may be Unicode string. Note that number of columns (see columns()) or grapheme clusters (see length()) of resulting string is not always equal to sum of both strings. Next position of new string is that set on the left value.

join ([STRING, ...])

Instance method. Join STRINGs inserting grapheme cluster string. Any of STRINGs may be Unicode string.

substr (OFFSET, [LENGTH, [REPLACEMENT]])

Instance method. Returns substring of grapheme cluster string. OFFSET and LENGTH are based on grapheme clusters. If REPLACEMENT is specified, substring is replaced by it. REPLACEMENT may be Unicode string.

Note: This method cannot return the lvalue, unlike built-in substr().

Operations as Sequence of Grapheme Clusters

as_array

"@{"OBJECT"}"

as_arrayref

Instance method. Convert grapheme cluster string to an array of grapheme clusters.

eos

Instance method. Test if current position is at end of grapheme cluster string.

item ([OFFSET])

Instance method. Returns OFFSET-th grapheme cluster. If OFFSET was not specified, returns next grapheme cluster.

next

"<"OBJECT">"

Instance method, iterative. Returns next grapheme cluster and increment next position.

pos ([OFFSET])

Instance method. If optional OFFSET is specified, set next position by it. Returns next position of grapheme cluster string.

Miscelaneous

lbc

Instance method. Returns Line Breaking Class (See Unicode::LineBreak) of the first character of first grapheme cluster.

lbcext

Instance method. Returns Line Breaking Class (See Unicode::LineBreak) of the last grapheme extender of last grapheme cluster. If there are no grapheme extenders or its class is CM, value of last grapheme base will be returned.

Incompatible Changes¶

Release 2013.10