JASS::stem_porter Class Reference

Generate the stem of a word using Porter's algorithm (version 1) More...

#include <stem_porter.h>

Inheritance diagram for JASS::stem_porter:

Collaboration diagram for JASS::stem_porter:

Public Member Functions
virtual	~stem_porter ()
	Detructor.
virtual std::string	name (void)
	Return the name of the stemming algorithm. More...
virtual size_t	tostem (char *destination, const char *source, size_t source_length)
	Stem from source into destination. More...
Public Member Functions inherited from JASS::stem
	stem ()
	Constructor.
virtual	~stem ()
	Destructor.
virtual size_t	tostem (parser::token &destination, const parser::token &source)
	Stem from term into destination. More...

Static Public Member Functions
static void	unittest (void)
	Unit test this class.
Static Public Member Functions inherited from JASS::stem
static void	unittest (void)
	Unit test this class.

Private Member Functions
bool	isvowely (const char *c)
	Is the character at this point a vowel according to Porter's definision. More...
bool	cvc (const char *what)
	Porter's "*o" rule, the stem ends cvc, where the second c is not W, X or Y (e.g. -WIL, -HOP). More...
size_t	length (const char *reversed)
	Return Porter's m in [C](VC)m[V], the length of the stem. More...
bool	has_vowel (const char *what)
	Does the string contain a vowel? More...

Private Attributes
std::string	workspace

Detailed Description

Generate the stem of a word using Porter's algorithm (version 1)

see: M.F. Porter, An algoritm for suffix stripping, Program, Vol 14, No 3, pp 130-137, July 1980 This code came from ATIRE, and has a few bug fixes applied (especially to rule 1)

Member Function Documentation

cvc()

bool JASS::stem_porter::cvc ( const char *  what )

inlineprivate

Porter's "*o" rule, the stem ends cvc, where the second c is not W, X or Y (e.g. -WIL, -HOP).

Parameters

what	[in] where to check

Returns

true or false.

has_vowel()

bool JASS::stem_porter::has_vowel ( const char *  what )

private

Does the string contain a vowel?

Parameters

what	[in] Where to check.

Returns

true if the string contains a vowel, false otherwise.

isvowely()

bool JASS::stem_porter::isvowely ( const char *  c )

inlineprivate

Is the character at this point a vowel according to Porter's definision.

Porter states: "A consonant in a word is a letter other than A, E, I, O or U, and other than Y preceded by a consonant." ... "If a letter is not a consonant it is a vowel." so a vowely is {aeiou} or {y} not folowed by a {aeiou}

Parameters

c	[in] Pointer to the character to check.

Returns

true if a vowely or false otherwise.

length()

size_t JASS::stem_porter::length ( const char *  reversed )

private

Return Porter's m in [C](VC)m[V], the length of the stem.

Parameters

reversed

[in] The string to count m on.

Returns

The length of the stem in units of m

name()

virtual std::string JASS::stem_porter::name ( void  )

inlinevirtual

Return the name of the stemming algorithm.

Returns

The name of the stemmer

Implements JASS::stem.

tostem()

size_t JASS::stem_porter::tostem ( char *  destination, const char *  source, size_t  source_length  )

virtual

Stem from source into destination.

Parameters

destination	[out] the result of the steming process (the stem)
source	[in] the term to stem
source_length	[in] the length of the string to stem

Returns

the length of the stem

Implements JASS::stem.

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The documentation for this class was generated from the following files:

• source/stem_porter.h
• source/stem_porter.cpp