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# Written by Aleksey Cheusov <vle@gmx.net>, public domain
#
# This awk module is a part of RunAWK distribution,
# http://sourceforge.net/projects/runawk
#
############################################################
# =head2 match_br.awk
#
# =over 2
#
# =item I<match_br(STRING, BR_OPEN, BR_CLOSE)>
#
# return start position (or zero if failure) of the substring
# surrounded by balanced (), [], {} or similar characters
# Also sets RSTART and RLENGTH variables just like
# the standard 'match' function does
#
# For example:
# print match_br("A (B (), C(D,C,F (), 123))", "(", ")")
# print RSTART, RLENGTH
# -| 3
# -| 3
# -| 24
#
# =back
#
function match_br (s, br_open, br_close, len,i,cnt){
len = length(s)
cnt = 0
for (i=1; i <= len; ++i){
ch = substr(s, i, 1)
if (ch == br_open){
if (cnt == 0){
RSTART = i
}
++cnt
}else if (ch == br_close){
--cnt
if (cnt == 0){
RLENGTH=i-RSTART+1
return RSTART
}
}
}
return 0
}
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