Note that this basic framework does not support awk's /regex1/,/regex2/
notation that captures lines between (and including) the lines matching
those regular expressions.
Best regards,
baptiste
--Greg
how about something like this simple implementation
# AWK in Ruby
module AWK
class ClassAwk
def initialize(filename = "")
@NR = 0; # record number
@NF = 0; # field number
@FS = /\s+/; # field separator
@line = ""; # line matched
@fields = ; # fields of macthed line
@trace = ; # regexp trace
if (filename == "")
@file = ARGF;
else
@file = File.open(filename, "r").close;;
end
end
#NOTE: every rule has to be in separate line
#to get unique rule id
def rule(regexp1, regexp2 = nil)
msg = "regexp parameter must be Regexp";
raise ArgumentError, msg unless regexp1.kind_of?(Regexp);
if regexp2 == nil
if @line =~ regexp1
@fields = @line.split(@FS)
yield
end
else
raise ArgumentError, msg unless regexp2.kind_of?(Regexp);
rule_id = /.+:([0-9]+)/.match(caller.first.to_s)[1].to_i;
@trace[rule_id] = true if @line =~ regexp1;
if @trace[rule_id]
@fields = @line.split(@FS)
yield
end
@trace[rule_id] = false if @line =~ regexp2;
end
end
def analyze()
@NR = 0;
ARGF.each { |@line|
@line = @line.chop;
@NR += 1;
yield
}
end
#get paricular field
def getField(index)
output = "";
if (index == 0)
output = @line;
else
if index - 1 < @fields.length
return @fields[index - 1];
end
end
end
#get NR (record number)
def getNR
return @NR;
end
#get number of fileds
def getNF
return @fields.length;
end
end
end
and an example how to use it:
require "awk.rb"
awk = AWK::ClassAwk.new();
awk.analyze() {
awk.rule(/start1/, /stop1/) {
print "1, NR:", awk.getNR(),", ";
print "NF: ", awk.getNF(),", ", awk.getField(0), "\n";
};
awk.rule(/start2/, /stop2/) {
print "2, NR:", awk.getNR(),", ";
print "NF: ", awk.getNF(),", ", awk.getField(0), "\n";
};
awk.rule(/start1/) {
print awk.getField(0);
};
}
···
--
Posted via http://www.ruby-forum.com/\.
