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#############################################################################
#
# File: lastc.icn
#
# Subject: Procedures for string scanning
#
# Author: David A. Gamey
#
# Date: March 25, 2002
#
#############################################################################
#
# This file is in the public domain.
#
#############################################################################
#
# Descriptions:
#
# lastc( c, s, i1, i2 ) : i3
#
# succeeds and produces i1, provided either
# - i1 is 1, or
# - s[i1 - 1] is in c and i2 is greater than i1
#
# defaults: same as for any
# errors: same as for any
#
# findp( c, s1, s2, i1, i2 ) : i3, i4, ..., in
#
# generates the sequence of positions in s2 at which s1 occurs
# provided that:
# - s2 is preceded by a character in c,
# or is found at the beginning of the string
# i1 & i2 limit the search as in find
#
# defaults: same as for find
# errors: same as for find & lastc
#
# findw( c1, s1, c2, s2, i1, i2 ) : i3, i4, ..., in
#
# generates the sequence of positions in s2 at which s1 occurs
# provided that:
# - s2 is preceded by a character in c1,
# or is found at the beginning of the string;
# and
# - s2 is succeeded by a character in c2,
# or the end of the string
# i1 & i2 limit the search as in find
#
# defaults: same as for find
# errors: same as for find & lastc
#
#############################################################################
procedure lastc( c, s, i1, i2 )
if /s := &subject then /i1 := &pos
/i1 := 1
/i2 := 0
suspend ( ( i1 = 1 ) | any( c, s, 0 < ( i1 - 1 ), i2 ) )
end
procedure findp( c, s1, s2, i1, i2 )
if /s2 := &subject then /i1 := &pos
/i1 := 1
/i2 := 0
suspend lastc( c, s2, find( s1, s2, i1, i2 ), i2 )
end
procedure findw( c1, s1, c2, s2, i1, i2 )
local csr,csr2
if /s2 := &subject then /i1 := &pos
/i1 := 1
/i2 := 0
suspend 1( csr := findp( c1, s1, s2, i1, i2 ),
csr2 := csr + *s1,
( csr2 = ( *s2 + 1 ) ) | any( c2, s2, csr2, i2 )
)
end
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