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strings ( ch )
integers ( p1 p2 )
booleans ( Y_found stemmed GE_removed )
routines (
R1 R2
C V VX
lengthen_V
Step_1 Step_2 Step_3 Step_4 Step_7
Step_6 Step_1c
Lose_prefix
Lose_infix
measure
)
externals ( stem )
groupings ( v v_WX AOU AIOU )
stringescapes {}
define v 'aeiouy'
define v_WX v + 'wx'
define AOU 'aou'
define AIOU 'aiou'
backwardmode (
define R1 as ($p1 <= cursor)
define R2 as ($p2 <= cursor)
define V as test (v or 'ij')
define VX as test (next v or 'ij')
define C as test (not 'ij' non-v)
define lengthen_V as do (
non-v_WX [ (AOU] test (non-v or atlimit)) or
('e'] test (non-v or atlimit
not AIOU
not (next AIOU non-v)))
->ch insert ch
)
define Step_1 as
(
[substring] among (
'{'}s' (delete)
's' (R1 not ('t' R1) C delete)
'ies' (R1 <-'ie')
'es'
(('ar' R1 C ] delete lengthen_V) or
('er' R1 C ] delete) or
(R1 C <-'e'))
'aus' (R1 V <-'au')
'en' (('hed' R1 ] <-'heid') or
('nd' delete) or
('d' R1 C ] delete) or
('i' or 'j' V delete) or
(R1 C delete lengthen_V))
'nde' (<-'nd')
)
)
define Step_2 as
(
[substring] among (
'je' (('{'}t' ] delete) or
('et' ] R1 C delete) or
('rnt' ] <-'rn') or
('t' ] R1 VX delete) or
('ink' ] <-'ing') or
('mp' ] <-'m') or
('{'}' ] R1 delete) or
(] R1 C delete))
'ge' (R1 <-'g')
'lijke'(R1 <-'lijk')
'ische'(R1 <-'isch')
'de' (R1 C delete)
'te' (R1 <-'t')
'se' (R1 <-'s')
're' (R1 <-'r')
'le' (R1 delete attach 'l' lengthen_V)
'ene' (R1 C delete attach 'en' lengthen_V)
'ieve' (R1 C <-'ief')
)
)
define Step_3 as
(
[substring] among (
'atie' (R1 <-'eer')
'iteit' (R1 delete lengthen_V)
'heid'
'sel'
'ster' (R1 delete)
'rder' (<-'r')
'ing'
'isme'
'erij' (R1 delete lengthen_V)
'arij' (R1 C <-'aar')
'fie' (R2 delete attach 'f' lengthen_V)
'gie' (R2 delete attach 'g' lengthen_V)
'tst' (R1 C <-'t')
'dst' (R1 C <-'d')
)
)
define Step_4 as
(
( [substring] among (
'ioneel' (R1 <-'ie')
'atief' (R1 <-'eer')
'baar' (R1 delete)
'naar' (R1 V <-'n')
'laar' (R1 V <-'l')
'raar' (R1 V <-'r')
'tant' (R1 <-'teer')
'lijker'
'lijkst' (R1 <-'lijk')
'achtig'
'achtiger'
'achtigst'(R1 delete)
'eriger'
'erigst'
'erig'
'end' (R1 C delete lengthen_V)
)
)
or
( [substring] among (
'iger'
'igst'
'ig' (R1 C delete lengthen_V)
)
)
)
define Step_7 as
(
[substring] among (
'kt' (<-'k')
'ft' (<-'f')
'pt' (<-'p')
)
)
define Step_6 as
(
[substring] among (
'bb' (<-'b')
'cc' (<-'c')
'dd' (<-'d')
'ff' (<-'f')
'gg' (<-'g')
'hh' (<-'h')
'jj' (<-'j')
'kk' (<-'k')
'll' (<-'l')
'mm' (<-'m')
'nn' (<-'n')
'pp' (<-'p')
'qq' (<-'q')
'rr' (<-'r')
'ss' (<-'s')
'tt' (<-'t')
'vv' (<-'v')
'ww' (<-'w')
'xx' (<-'x')
'zz' (<-'z')
'v' (<-'f')
'z' (<-'s')
)
)
define Step_1c as
(
[substring] among ( (R1 C)
'd' (not ('n' R1) delete)
't' (not ('h' R1) delete)
)
)
)
define Lose_prefix as (
['ge'] test hop 3 (goto v goto non-v)
set GE_removed
delete
)
define Lose_infix as (
next
gopast (['ge']) test hop 3 (goto v goto non-v)
set GE_removed
delete
)
define measure as (
$p1 = limit
$p2 = limit
do(
repeat non-v atleast 1 ('ij' or v) non-v setmark p1
repeat non-v atleast 1 ('ij' or v) non-v setmark p2
)
)
define stem as (
unset Y_found
unset stemmed
do ( ['y'] <-'Y' set Y_found )
do repeat(goto (v ['y'])<-'Y' set Y_found )
measure
backwards (
do (Step_1 set stemmed )
do (Step_2 set stemmed )
do (Step_3 set stemmed )
do (Step_4 set stemmed )
)
unset GE_removed
do (Lose_prefix and measure)
backwards (
do (GE_removed Step_1c)
)
unset GE_removed
do (Lose_infix and measure)
backwards (
do (GE_removed Step_1c)
)
backwards (
do (Step_7 set stemmed )
do (stemmed or GE_removed Step_6)
)
do(Y_found repeat(goto (['Y']) <-'y'))
)
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