/usr/share/lout/include/lengths is in lout-common 3.39-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# #
# lengths #
# #
# Jeffrey H. Kingston #
# 30 October 2002 #
# #
# 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, 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, write to the Free Software #
# Foundation, Inc., 59 Temple Place, Suite 330, Boston MA 02111-1307 USA #
# #
# As a special exception, when this file is read by Lout when processing #
# a Lout source document, you may use the result without restriction. #
# #
# This file offers two symbols for converting between PostScript #
# lengths and Lout lengths. This has been a messy area and the two #
# symbols in this file, @LoutLengths and @PSLengths, are my attempt #
# to put a final end to the mess. #
# #
# A Lout length is, and has always been, a number followed by #
# a one-letter unit of measurement: i c p m s v f d. #
# #
# A PostScript length is, and has always been, a number followed #
# by a space followed by a two-letter unit of measurement, one of #
# in cm pt em sp vs ft dg. #
# #
# To the ordinary user who reads the User's Guide, all lengths #
# now look like Lout lengths. However, internally some of these #
# lengths are used by Lout and others are passed to PostScript. #
# Based on the two symbols @PSLengths and @LoutLengths defined #
# below, an option x which could contain a length of either kind #
# can be classified as one of three types: #
# #
# Type of option How to handle it #
# ------------------------------------------------------------------- #
# Option was never advertised named x { ... } #
# as taking a PostScript length #
# #
# Option was advertised as import @LoutLengths named x { ... } #
# possibly taking a PostScript #
# length, but its value is used #
# by Lout #
# #
# Option whose value has to be import @PSLengths named x { ... } #
# passed to PostScript #
# ------------------------------------------------------------------- #
# #
# Either kind of import allows either kind of length to be given; #
# @LoutLengths makes sure the final result is suitable for passing #
# to Lout, while @PSLengths makes sure the final result is suitable #
# for passing to PostScript. If things had been done right from the #
# start, there would be no need for @LoutLengths, but for backward #
# compatibility we will continue to use it basically forever. #
# #
###########################################################################
###########################################################################
# #
# @LoutLengths #
# #
# Convert PostScript lengths into Lout lengths. #
# #
###########################################################################
export in cm pt em sp vs ft dg
def @LoutLengths
{
def in left x { x"i" }
def cm left x { x"c" }
def pt left x { x"p" }
def em left x { x"m" }
def sp left x { x"s" }
def vs left x { x"b" }
def ft left x { x"f" }
def dg left x { x"d" }
}
###########################################################################
# #
# @PSLengths #
# #
# Convert Lout lengths into PostScript (also PDF) lengths. #
# PDF is no longer supported but this code was there already so #
# it's been carried over. #
# #
###########################################################################
export i c p m s v f d
def @PSLengths
{
def i left x {
@BackEnd @Case {
PostScript @Yield { x" in" }
PDF @Yield { "__mul(__in, "x")" }
PlainText @Yield ""
}
}
def c left x {
@BackEnd @Case {
PostScript @Yield { x" cm" }
PDF @Yield { "__mul(__cm, "x")" }
PlainText @Yield ""
}
}
def p left x {
@BackEnd @Case {
PostScript @Yield { x" pt" }
PDF @Yield { "__mul(__pt, "x")" }
PlainText @Yield ""
}
}
def m left x {
@BackEnd @Case {
PostScript @Yield { x" em" }
PDF @Yield { "__mul(__em, "x")" }
PlainText @Yield ""
}
}
def s left x {
@BackEnd @Case {
PostScript @Yield { x" sp" }
PDF @Yield { "__mul(__louts, "x")" }
PlainText @Yield ""
}
}
def v left x {
@BackEnd @Case {
PostScript @Yield { x" vs" }
PDF @Yield { "__mul(__loutv, "x")" }
PlainText @Yield ""
}
}
def f left x {
@BackEnd @Case {
PostScript @Yield { x" ft" }
PDF @Yield { "__mul(__loutf, "x")" }
PlainText @Yield ""
}
}
def d left x {
@BackEnd @Case {
PostScript @Yield { x" dg" }
PDF @Yield { "__mul(__loutd, "x")" }
PlainText @Yield ""
}
}
}
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