Class: Ferret::Analysis::LowerCaseFilter

Summary

LowerCaseFilter normalizes a token‘s text to lowercase based on the current locale.

Example

  ["One", "TWO", "three", "RÉSUMÉ"] => ["one", "two", "three", "résumé"]

Public Class Methods

LowerCaseFilter.new(token_stream) → token_stream

Create an LowerCaseFilter which normalizes a token‘s text to lowercase based on the current locale. 

/* 
 *  call-seq:
 *     LowerCaseFilter.new(token_stream) -> token_stream
 *
 *  Create an LowerCaseFilter which normalizes a token's text to
 *  lowercase based on the current locale.
 */
static VALUE
frt_lowercase_filter_init(VALUE self, VALUE rsub_ts) 
{
    TokenStream *ts = frt_get_cwrapped_rts(rsub_ts);
#ifndef POSH_OS_WIN32
    if (!frt_locale) frt_locale = setlocale(LC_CTYPE, "");
#endif
    ts = mb_lowercase_filter_new(ts);
    object_add(&(TkFilt(ts)->sub_ts), rsub_ts);

    Frt_Wrap_Struct(self, &frt_tf_mark, &frt_tf_free, ts);
    object_add(ts, self);
    return self;
}