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- ext/r_analysis.c

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### Class/Module Index

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- Ferret
- Ferret::Analysis
- Ferret::Analysis::Analyzer
- Ferret::Analysis::AsciiLetterAnalyzer
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- Ferret::Analysis::AsciiWhiteSpaceTokenizer
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No matching classes.

# Ferret::Analysis::TokenStream

## Summary

A TokenStream enumerates the sequence of tokens, either from fields of a document or from query text.

This is an abstract class. Concrete subclasses are:

Tokenizer | a TokenStream whose input is a string
TokenFilter | a TokenStream whose input is another TokenStream

### Public Instance Methods

next → token click to toggle source

Return the next token from the TokenStream or nil if there are no more tokens.

    static VALUE
    frb_ts_next(VALUE self)
    {
        TokenStream *ts;
        Token *next;
        GET_TS(ts, self);
        next = ts->next(ts);
        if (next == NULL) {
            return Qnil;
        }

        return get_token(next);
    }

text = text → text click to toggle source

Return the text that the TokenStream is tokenizing

    static VALUE
    frb_ts_get_text(VALUE self)
    {
        VALUE rtext = Qnil;
        TokenStream *ts;
        Data_Get_Struct(self, TokenStream, ts);
        if ((rtext = object_get(&ts->text)) == Qnil) {
            if (ts->text) {
                rtext = rb_str_new2(ts->text);
                object_set(&ts->text, rtext);
            }
        }
        return rtext;
    }

text = text → text click to toggle source

Set the text attribute of the TokenStream to the text you wish to be tokenized. For example, you may do this;

    token_stream.text = File.read(file_name)

    static VALUE
    frb_ts_set_text(VALUE self, VALUE rtext)
    {
        TokenStream *ts;
        Data_Get_Struct(self, TokenStream, ts);
        StringValue(rtext);
        ts->reset(ts, rs2s(rtext));

        /* prevent garbage collection */
        rb_ivar_set(self, id_text, rtext);

        return rtext;
    }

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