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integers ( p1 p2 )
booleans ( Y_found )
routines (
shortv
R1 R2
Step_1a Step_1b Step_1c Step_2 Step_3 Step_4 Step_5a Step_5b
)
externals ( stem )
groupings ( v v_WXY )
define v 'aeiouy'
define v_WXY v + 'wxY'
backwardmode (
define shortv as ( non-v_WXY v non-v )
define R1 as $p1 <= cursor
define R2 as $p2 <= cursor
define Step_1a as (
[substring] among (
'sses' (<-'ss')
'ies' (<-'i')
'ss' ()
's' (delete)
)
)
define Step_1b as (
[substring] among (
'eed' (R1 <-'ee')
'ed'
'ing' (
test gopast v delete
test substring among(
'at' 'bl' 'iz'
(<+ 'e')
'bb' 'dd' 'ff' 'gg' 'mm' 'nn' 'pp' 'rr' 'tt'
// ignoring double c, h, j, k, q, v, w, and x
([next] delete)
'' (atmark p1 test shortv <+ 'e')
)
)
)
)
define Step_1c as (
['y' or 'Y']
gopast v
<-'i'
)
define Step_2 as (
[substring] R1 among (
'tional' (<-'tion')
'enci' (<-'ence')
'anci' (<-'ance')
'abli' (<-'able')
'entli' (<-'ent')
'eli' (<-'e')
'izer' 'ization'
(<-'ize')
'ational' 'ation' 'ator'
(<-'ate')
'alli' (<-'al')
'alism' 'aliti'
(<-'al')
'fulness' (<-'ful')
'ousli' 'ousness'
(<-'ous')
'iveness' 'iviti'
(<-'ive')
'biliti' (<-'ble')
)
)
define Step_3 as (
[substring] R1 among (
'alize' (<-'al')
'icate' 'iciti' 'ical'
(<-'ic')
'ative' 'ful' 'ness'
(delete)
)
)
define Step_4 as (
[substring] R2 among (
'al' 'ance' 'ence' 'er' 'ic' 'able' 'ible' 'ant' 'ement'
'ment' 'ent' 'ou' 'ism' 'ate' 'iti' 'ous' 'ive' 'ize'
(delete)
'ion' ('s' or 't' delete)
)
)
define Step_5a as (
['e']
R2 or (R1 not shortv)
delete
)
define Step_5b as (
['l']
R2 'l'
delete
)
)
define stem as (
unset Y_found
do ( ['y'] <-'Y' set Y_found)
do repeat(goto (v ['y']) <-'Y' set Y_found)
$p1 = limit
$p2 = limit
do(
gopast v gopast non-v setmark p1
gopast v gopast non-v setmark p2
)
backwards (
do Step_1a
do Step_1b
do Step_1c
do Step_2
do Step_3
do Step_4
do Step_5a
do Step_5b
)
do(Y_found repeat(goto (['Y']) <-'y'))
)
|
