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#!/usr/bin/awk -f
#
# Compiles a "magic" CSV file into a normal CSV
#
# Copyright (C) 2016 LoVullo Associates, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# "Magic" CSVs simply exist to make life easier: they permit comments, blank
# lines, variables, sub-delimiter expansion, and any number of ranges per line.
# Ranges will be expanded in every combination, making rate tables highly
# maintainable.
#
# Variables are also supported when defined using :var=val. Variables may
# expand into ranges, 'cause they're awesome. Multiple variables may be
# delimited by semi-colons, as may multiple values.
#
# For example:
# :foo=1--3
# $foo;7;9--10:$foo, 5--10
#
# Would generate:
# 1, 5
# 1, 6
# ...
# 5, 10
# 2, 5
# ...
# 9, 5
# ...
# 1, 5
# 1, 6
# ...
##
function rangeout( i, m, j, me, orig )
{
if ( i > NF )
{
print
return
}
orig = $i
# check first for delimiters
if ( match( $i, /^([^;]+);(.*)$/, m ) )
{
# give it a shot with the first value
$i = m[1]
rangeout( i )
# strip off the first value and process with following value(s)
$i = m[2]
rangeout( i )
# we've delegated; we're done
$i = orig
return
}
# attempt to parse variable (may expand into a range)
if ( match( $i, /^\$([a-zA-Z_-]+)$/, m ) )
{
$i = vars[ m[1] ];
}
# parse range
if ( match( $i, /^([0-9]+)--([0-9]+)$/, m ) )
{
j = m[1]
me = m[2]
do
{
$i = j
rangeout( i + 1 )
} while ( j++ < me )
}
else
{
rangeout( i + 1 );
}
# restore to original value
$i = orig
}
BEGIN {
# we're parsing CSVs
FS = " *, *"
OFS = ","
}
# skip all lines that begin with `#', which denotes a comment, or are empty
/^#|^$/ { next; }
# lines that begin with a colon are variable definitions
/^:/ {
match( $0, /^:([a-zA-Z_-]+)=(.*?)$/, m )
vars[ m[1] ] = m[2]
next
}
# lines containing ranges (denoted by `--', the en dash, which is a typesetting
# convetion for ranges), sub-delimiters, or variables must be expanded
/--|;|\$[a-zA-Z_-]/ { rangeout( 1 ); next; }
# all other lines are normal; simply output them verbatim
{
# this assignment will ensure that awk processes the output, ensuring that
# extra spaces between commas are stripped
$1=$1
print
}
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