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696 lines
22 KiB
696 lines
22 KiB
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/*************************************************************************
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* *
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* STEM.C *
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* *
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* Copyright (C) Microsoft Corporation 1990-1994 *
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* All Rights reserved. *
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* *
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**************************************************************************
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* *
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* Module Intent *
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* This module contains the functions to strip off the suffix of a word *
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* It is based on the research paper of Dr. Porter, pulished in *
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* An algorithm for suffix stripping *
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* Program, Vol.14, no.3,pp 130-137, July 1980 *
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* *
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* Description: *
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* *
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* The full description of the algorithm can be found in that document *
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* Basically, the algorithm consists of: *
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* - Matching the suffix from a table of suffixes *
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* - Applies the rule that comes with the suffix *
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* - If the rule matches, then change the suffix to the new one *
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* *
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* Comments: *
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* *
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* 1/ There are some misconceptions about stripping the suffix *
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* People are thinking in term of super-smart algorithm that can *
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* strip a word to its stem. The fact is that it is not necessarily *
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* true. For example, DIED is strippe to DI, but not DIE. *
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* *
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* 2/ The current code is SLOW, but it easy to understand in term *
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* of implementation, since it is straigthforward from the algorithm *
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* description. The impact on runtime is nothing. On compiled time *
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* stemming 5,000,000 words will take less than 1 hour, which is *
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* acceptable, since a project that large requires 1-2 days to *
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* compile. *
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* *
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* To improve the speed (up to 2 times), we can scan the suffix *
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* if one letter doesn't match we can jump pass all stem that have *
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* this letter *
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* WARNING: Tab setting is 4 for this file *
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* *
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**************************************************************************
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* *
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* Current Owner: BinhN *
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* *
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**************************************************************************/
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#include <mvopsys.h>
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#include <memory.h>
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#include <mvsearch.h>
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#include "common.h"
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#define VOWEL 0
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#define CONSONANT 1
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#define MIXED 2
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#define MIN_LENGTH_FOR_STEM 3
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/* Rule table structure */
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typedef struct RULE
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{
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LPB szInitSuffix; // Initial suffix
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LPB szNewSuffix; // New suffix
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LPB szCondition; // Stemming condition
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short NextTable; // Next table to jump to
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} RULE, FAR *LPRULE;
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/* The conventional letter used for the stemming condition are:
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*
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* '1': Measure == 1
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* '2': Measure > 1
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* 'd': Double consonant at the end (*d in the document)
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* 'o': Form cvc , and 2nd c is not W, X or Y (*o in the document)
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* 'p': Measure > 0
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* 's': Remove the last consonant (used with 'd')
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* 'v': Word contains vowels (*v* in the document)
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* '*': Terminated with the next letter (*S in the document)
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* '&': AND operation
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* '|': OR operation
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* '!': NOT operation
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* The rule operation is based on a postfix notation, so "m=1 and *o*" is
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* described as "1o&"
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*/
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RULE RuleTab0[] =
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{
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"\4sses", "\2ss", NULL, 1,
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"\3ies", "\1i", NULL, 1,
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"\2ss", "\2ss", NULL, 1,
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"\1s", "\0", NULL, 1,
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NULL, NULL, NULL, 1,
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};
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RULE RuleTab1[] =
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{
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"\3eed", "\2ee", "p", 3,
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"\2ed", "\0", "v", 2,
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"\3ing", "\0", "v", 2,
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NULL, NULL, NULL, 3,
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};
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RULE RuleTab2[] =
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{
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"\2at", "\3ate", NULL, 3,
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"\2bl", "\3ble", NULL, 3,
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"\2iz", "\3ize", NULL, 3,
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/* The following szNewSuffix has a negative \377
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* (-1) length. It is to be used to reduce a
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* double consonant ending to single consonant
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*/
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"\0", "\377\0", "*l*s|*z|!d&s", 3,
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"\0", "\1e", "1o&", 3,
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NULL, NULL, NULL, 3,
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};
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RULE RuleTab3[] =
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{
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"\1y", "\1i", "v", 4,
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NULL, NULL, NULL, 4,
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};
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RULE RuleTab4[] =
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{
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"\7ational", "\3ate", "p", 5,
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"\6tional", "\4tion", "p", 5,
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"\4enci", "\4ence", "p", 5,
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"\4anci", "\4ance", "p", 5,
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"\4izer", "\3ize", "p", 5,
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"\4abli", "\4able", "p", 5,
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"\4alli", "\2al", "p", 5,
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"\5entli", "\3ent", "p", 5,
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"\3eli", "\1e", "p", 5,
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"\5ousli", "\3ous", "p", 5,
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"\7ization", "\3ize", "p", 5,
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"\5ation", "\3ate", "p", 5,
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"\4ator", "\3ate", "p", 5,
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"\5alism", "\2al", "p", 5,
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"\7iveness", "\3ive", "p", 5,
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"\7fulness", "\3ful", "p", 5,
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"\7ousness", "\3ous", "p", 5,
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"\5aliti", "\2al", "p", 5,
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"\5iviti", "\3ive", "p", 5,
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"\6biliti", "\3ble", "p", 5,
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NULL, NULL, NULL, 5,
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};
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RULE RuleTab5[] =
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{
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"\5icate", "\2ic", "p", 6,
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"\5ative", "\0", "p", 6,
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"\5alize", "\2al", "p", 6,
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"\5iciti", "\2ic", "p", 6,
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"\4ical", "\2ic", "p", 6,
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"\3ful", "\0", "p", 6,
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"\4ness", "\0", "p", 6,
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NULL, NULL, NULL, 6,
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};
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RULE RuleTab6[] =
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{
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"\2al", "\0", "2", 7,
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"\4ance", "\0", "2", 7,
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"\4ence", "\0", "2", 7,
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"\2er", "\0", "p", 7,
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"\2ic", "\0", "2", 7,
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"\4able", "\0", "2", 7,
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"\4ible", "\0", "2", 7,
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"\3ant", "\0", "2", 7,
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"\5ement", "\0", "2", 7,
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"\4ment", "\0", "2", 7,
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"\3ent", "\0", "2", 7,
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"\3ion", "\0", "2*s*t|&", 7,
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"\2ou", "\0", "2", 7,
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"\3ism", "\0", "2", 7,
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"\3ate", "\0", "2", 7,
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"\3iti", "\0", "2", 7,
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"\3ous", "\0", "2", 7,
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"\3ive", "\0", "2", 7,
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"\3ize", "\0", "2", 7,
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NULL, NULL, NULL, 7,
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};
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RULE RuleTab7[] =
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{
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"\1e", "\0", "2", 8,
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"\1e", "\0", "1o!&", 8,
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NULL, NULL, NULL, 8,
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};
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RULE RuleTab8[] =
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{
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"\2ll", "\1l", "2", 9,
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"\0", "\377\0", "2*l&d&s", 9,
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NULL, NULL, NULL, 9,
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};
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char CharTypeTab[] =
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{
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VOWEL, //a
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CONSONANT, //b
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CONSONANT, //c
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CONSONANT, //d
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VOWEL, //e
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CONSONANT, //f
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CONSONANT, //g
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CONSONANT, //h
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VOWEL, //i
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CONSONANT, //j
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CONSONANT, //k
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CONSONANT, //l
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CONSONANT, //m
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CONSONANT, //n
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VOWEL, //o
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CONSONANT, //p
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CONSONANT, //q
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CONSONANT, //r
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CONSONANT, //s
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CONSONANT, //t
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VOWEL, //u
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CONSONANT, //v
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CONSONANT, //w
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CONSONANT, //x
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MIXED, //y, consonant, but may be vowel if after consonant
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CONSONANT, //z
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};
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LPRULE RuleTables[] =
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{
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RuleTab0,
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RuleTab1,
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RuleTab2,
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RuleTab3,
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RuleTab4,
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RuleTab5,
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RuleTab6,
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RuleTab7,
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RuleTab8,
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NULL,
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};
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/*************************************************************************
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*
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* INTERNAL PRIVATE FUNCTIONS
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* All of them should be declared near
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*************************************************************************/
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int PRIVATE PASCAL NEAR MeasureCalc (LPB, int);
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int PRIVATE PASCAL NEAR ConditionMet (LPB, LPB, LPB, int);
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int PRIVATE PASCAL NEAR SuffixMatch (LPB lpbWord, LPB lpSuffix);
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HRESULT PRIVATE PASCAL NEAR MarkType (LPB, LPB, int);
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/*************************************************************************
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*
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* @doc API INDEX RETRIEVAL
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*
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* @func HRESULT PASCAL FAR | FStem |
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* This function will strip the suffix from a word, ie, "stem" it
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*
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* @parm LPB | lpbStemWord |
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* Buffer to contain the stemmed word
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*
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* @parm LPB | lpbWord |
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* Word to be stemmed
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*
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* @rdesc S_OK if succeeded, or E_INVALIDARG if the null argument is
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* passed
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*
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* @comm The word passed must have all the letters in lower case for
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* The function to work with. WARNING: There is no checking about
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* case, so thing can go wrong if the word contains upper case letter
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* or non alphabetic letter.
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*
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*************************************************************************/
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PUBLIC HRESULT PASCAL FAR EXPORT_API FStem (LPB lpbStemWord, LPB lpbWord)
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{
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register int wLength; // Length of the word
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register int i; // Scratch variable
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LPRULE lpRuleTab; // Pointer to rule table
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LPRULE lpRule; // Pointer to rule
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int wLengthSaved;
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int wNewSuffixLength; // This must be signed!
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int wInitSuffixLength;
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char lpbWordType [CB_MAX_WORD_LEN];
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LPB szInitSuffix;
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LPB szNewSuffix;
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int TableIndex; // For debugging purpose only
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int RuleIndex; // For debugging purpose only
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LPB lpbTmp;
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if (lpbWord == NULL)
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return E_INVALIDARG;
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wLength = (*(LPW)lpbWordType = *((LPW)lpbWord));
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if (wLength >= CB_MAX_WORD_LEN)
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return(E_WORDTOOLONG);
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/* Copy the word over */
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MEMCPY (lpbStemWord, lpbWord, wLength + 2);
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/* Don't do any stemming for words <= 3 bytes */
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if (wLength <= MIN_LENGTH_FOR_STEM)
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return S_OK;
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/* Mark the type of each letter to be consonant or vowel */
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if (MarkType (lpbStemWord+2, lpbWordType+2, wLength) != S_OK)
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{
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/* We got some non alphabetic characters. Just return */
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return S_OK;
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}
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/* Traverse all the tables and check for stemming conditions */
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for (TableIndex = 0, lpRuleTab = RuleTables[0]; lpRuleTab;)
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{
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/* Check for each rule */
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for (RuleIndex = 0, lpRule = lpRuleTab;
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szInitSuffix = lpRule->szInitSuffix; lpRule++, RuleIndex++)
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{
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szNewSuffix = lpRule->szNewSuffix;
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/* The casting is needed to make wNewSuffixLength signed */
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wNewSuffixLength = (char)*szNewSuffix++;
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wInitSuffixLength = (char)*szInitSuffix++;
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/* Check for condition match */
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if (wLength >= wInitSuffixLength)
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{
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lpbTmp = lpbStemWord + wLength + 2 - wInitSuffixLength;
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/* Compare the suffixes */
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for (i = wInitSuffixLength;
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i > 0 && (*lpbTmp == *szInitSuffix);
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i--, lpbTmp++, szInitSuffix++);
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/* Restore szInitSuffix */
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szInitSuffix = lpRule->szInitSuffix;
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if (i != 0) // String comparison fails
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continue;
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/* Save the word length */
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wLengthSaved = wLength;
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/* Update word length since we don't include the suffix
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* length in our computation
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*/
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wLength -= wInitSuffixLength;
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/* Now check the stemming condition */
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if (ConditionMet (lpbStemWord, lpbWordType,
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lpRule->szCondition, wLength))
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{
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/* Rule applies, change to the new suffix */
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if (wNewSuffixLength > 0)
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{
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MEMCPY (&lpbStemWord[wLength+2], szNewSuffix,
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wNewSuffixLength);
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/* Update the word type */
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MarkType (szNewSuffix,
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lpbWordType + wLength + 2, wNewSuffixLength);
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}
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/* Update the word length
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* The check for wLength is necessary since we don't
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* want to strip evething
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*/
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if (wLength + wNewSuffixLength > 0)
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*(LPW)lpbStemWord = (wLength += wNewSuffixLength);
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if (wLength <= MIN_LENGTH_FOR_STEM)
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goto Done;
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break;
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}
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else
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{
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/* Rule doesn't apply, Restore the word length */
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wLength = wLengthSaved;
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}
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}
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}
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/* Go to the next table */
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lpRuleTab = RuleTables [TableIndex = lpRule->NextTable];
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}
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Done:
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lpbStemWord[*((LPW)lpbStemWord)+2] = 0;
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return S_OK;
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}
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/*************************************************************************
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*
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* @doc INTERNAL
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*
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* @func int PASCAL NEAR | MeasureCalc |
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* Calculate the measure of a word. The measure is defined as
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* the pair (VC), where V is the vowels, and C consonants. A word
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* is described as [C](VC)m[V], where the first C and the last V are
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* optional. m is the measure of the word (or part of word without
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* the suffix). Example:
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* architect: m = 3 (arch, it, ect)
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* convention: m = 3 (onv, ent, ion)
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* lie: m = 0, since the first consonant, and the last vowels
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* don't count
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*
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* @parm LPB | lpbWordType |
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* Buffer containing word type
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*
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* @parm int | wLength |
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* The length of the word
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*
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* @rdesc Return the measure of the word
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*
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*************************************************************************/
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int PRIVATE PASCAL NEAR MeasureCalc (LPB lpbWordType, register int wLength)
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{
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register int cMeasure;
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#if 0
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/* Safety chck
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* IFdef out for speed. This is a internal function
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*/
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if (lpbWordType == NULL)
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return 0;
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#endif
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/* Initialize the word measure */
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cMeasure = 0;
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/* Skip the beginning consonants */
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for (;wLength > 0 && *lpbWordType == CONSONANT; wLength--, lpbWordType++);
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/* Get the vowel/consonant pairs */
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while (wLength > 0)
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{
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/* Get all the vowels */
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for (; wLength > 0 && *lpbWordType == VOWEL; wLength--, lpbWordType++);
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if (wLength > 0)
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{
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cMeasure ++;
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/* Get all the consonants */
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for (; wLength > 0 && *lpbWordType == CONSONANT;
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wLength--, lpbWordType++);
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}
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}
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return cMeasure;
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}
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/*************************************************************************
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*
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* @doc INTERNAL
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*
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* @func int PASCAL NEAR | ConditionMet |
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* This fuction check the condition to be met by a particular
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* suffix.
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*
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* @parm LPB | lpbWord |
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* Buffer contains the word to be stemmed> This is a 2-byte prefixed
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* pascal string
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*
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* @parm LPB | lpbWordType |
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* Buffer containing the type of each letter of the word. This
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* is a parallel buffer
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*
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* @parm LPB | szCondition |
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* Condtion in postfix form
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*
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* @parm int | wLength |
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* Length of the word
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*
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* @rdesc TRUE, if the condition is met, FALSE otherwise
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*
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*************************************************************************/
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int PRIVATE PASCAL NEAR ConditionMet (LPB lpbWord, LPB lpbWordType,
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LPB szCondition, int wLength)
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{
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int StackIndex;
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int Stack[4];
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int wLengthSaved;
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int LastByte;
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LPB lpbTmp;
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LPB lpbTmpType;
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if (szCondition == NULL)
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return TRUE;
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/* Initialize variables
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* Note: The original codes are written for a 1-byte length preceded
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* string. The new format is 2-byte preceded string. To minimize the
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* change, lpbTmp is used, and points to the 2nd byte
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*/
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StackIndex = -1;
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lpbTmp = lpbWord + 1;
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lpbTmpType = lpbWordType + 1;
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LastByte = lpbTmp[wLength];
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while (*szCondition)
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{
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switch (*szCondition)
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{
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case '*': // *S in the document
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/* Check to see if the stem ends with the next letter */
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Stack[++StackIndex] =
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(LastByte == *(++szCondition));
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break;
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case 'd': // *d in the document
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/* Check to see if the stem ends with a double consonant */
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Stack[++StackIndex] = (wLength > 2 &&
|
|
LastByte == lpbTmp[wLength - 1] &&
|
|
lpbTmpType[wLength] == CONSONANT);
|
|
break;
|
|
|
|
case 's': // Remove the last consonant
|
|
if (Stack[0])
|
|
{
|
|
lpbTmp[wLength] = 0;
|
|
wLength --;
|
|
*(LPW)lpbWordType = *(LPW)lpbWord = (WORD) wLength;
|
|
}
|
|
break;
|
|
|
|
case 'v': // *v* in the document
|
|
|
|
/* Check to see if the word has a vowel */
|
|
|
|
wLengthSaved = wLength; /* Save the length */
|
|
|
|
for (; wLength &&
|
|
lpbTmpType[wLength] != VOWEL; wLength--);
|
|
|
|
Stack[++StackIndex] = wLength > 0;
|
|
|
|
/* Restore the word length */
|
|
wLength = wLengthSaved;
|
|
break;
|
|
|
|
case 'o':
|
|
/* *o in the document, ie.
|
|
- The word ends with the form cvc
|
|
- The second c is not W, X, Y
|
|
The +2 is for skipping the word length
|
|
*/
|
|
Stack[++StackIndex] = (wLength >= 3) &&
|
|
(lpbWordType[wLength + 1] == CONSONANT) &&
|
|
(lpbWordType[wLength] == VOWEL) &&
|
|
(lpbWordType[wLength - 1] == CONSONANT) &&
|
|
(LastByte != 'w' && LastByte != 'x' && LastByte != 'y');
|
|
break;
|
|
|
|
/* The conditions below test Measure. If they fails, then
|
|
* the whole condition fails. ie. there is no need to test
|
|
* any other conditions. There is no need to save the result
|
|
* on the stack
|
|
*/
|
|
|
|
case 'p': // Measure > 0
|
|
if ((Stack[++StackIndex] =
|
|
MeasureCalc (lpbWordType+2, wLength) > 0) == FALSE)
|
|
return FALSE;
|
|
break;
|
|
|
|
case '2': // Measure > 1
|
|
if ((Stack[++StackIndex] =
|
|
MeasureCalc (lpbWordType+2, wLength) > 1) == FALSE)
|
|
return FALSE;
|
|
break;
|
|
|
|
case '1': // Measure == 1
|
|
if ((Stack[++StackIndex] =
|
|
MeasureCalc (lpbWordType+2, wLength) == 1) == FALSE)
|
|
return FALSE;
|
|
break;
|
|
|
|
/* The next conditions are operators combination */
|
|
|
|
case '|':
|
|
|
|
/* OR the result of the top 2 stack entries */
|
|
|
|
Stack[StackIndex-1] |= Stack[StackIndex];
|
|
StackIndex--;
|
|
break;
|
|
|
|
case '&':
|
|
|
|
/* AND the result of the top 2 stack entries */
|
|
|
|
Stack[StackIndex-1] &= Stack[StackIndex];
|
|
StackIndex--;
|
|
break;
|
|
|
|
case '!':
|
|
|
|
/* NOT the result of the top stack entry */
|
|
|
|
Stack[StackIndex] = !Stack[StackIndex];
|
|
break;
|
|
|
|
default:
|
|
return FALSE;
|
|
}
|
|
szCondition++;
|
|
}
|
|
|
|
return Stack[0];
|
|
}
|
|
|
|
/*************************************************************************
|
|
*
|
|
* @doc INTERNAL
|
|
*
|
|
* @func HRESULT PASCAL NEAR | MarkType |
|
|
* Marking the type of each letter of the word to be CONSONANT or
|
|
* VOWEL
|
|
*
|
|
* @parm LPB | lpbWord |
|
|
* Buffer containing the word
|
|
*
|
|
* @parm LPB | lpBufType |
|
|
* Buffer to contain the type of the letters
|
|
*
|
|
* @parm int | wLength |
|
|
* Length of the word
|
|
*
|
|
*************************************************************************/
|
|
|
|
HRESULT PRIVATE PASCAL NEAR MarkType (LPB lpbWord, LPB lpBufType, int wLength)
|
|
{
|
|
for (; wLength > 0; lpBufType++, lpbWord++, wLength--)
|
|
{
|
|
|
|
/* Consider wildcard characters to be consonnant */
|
|
if (*lpbWord == '?' || *lpbWord == '*')
|
|
{
|
|
*lpBufType = CONSONANT;
|
|
continue;
|
|
}
|
|
|
|
if (*lpbWord < 'a' || *lpbWord > 'z')
|
|
return E_FAIL;
|
|
|
|
switch (CharTypeTab [*lpbWord - 'a'])
|
|
{
|
|
case CONSONANT:
|
|
*lpBufType = CONSONANT;
|
|
break;
|
|
case VOWEL:
|
|
*lpBufType = VOWEL;
|
|
break;
|
|
case MIXED:
|
|
if (*(lpBufType - 1) == CONSONANT)
|
|
*lpBufType = VOWEL;
|
|
else
|
|
*lpBufType = CONSONANT;
|
|
break;
|
|
}
|
|
}
|
|
return S_OK;
|
|
}
|