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git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@19192 a592a061-630c-0410-9148-cb99ea01b6c8
1799 lines
25 KiB
Plaintext
1799 lines
25 KiB
Plaintext
#LyX 1.5.0svn created this file. For more info see http://www.lyx.org/
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\lyxformat 276
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\begin_document
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\begin_header
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\textclass literate-article
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\begin_preamble
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%
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% This relaxes the noweb constraint that chunks are
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% never broken across pages.
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%
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% This is from the noweb FAQ
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%
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\def\nwendcode{\endtrivlist \endgroup}
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\let\nwdocspar=\smallbreak
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\end_preamble
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\language english
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\inputencoding default
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\font_roman default
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\font_sans default
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\font_typewriter default
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\font_default_family default
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\font_sc false
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\font_osf false
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\font_sf_scale 100
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\font_tt_scale 100
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\graphics default
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\paperfontsize default
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\spacing single
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\papersize default
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\use_geometry false
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\use_amsmath 0
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\use_esint 0
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\cite_engine basic
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\use_bibtopic false
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\paperorientation portrait
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\secnumdepth 3
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\tocdepth 3
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\paragraph_separation indent
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\defskip medskip
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\quotes_language english
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\papercolumns 1
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\papersides 1
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\paperpagestyle default
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\tracking_changes false
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\output_changes false
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\end_header
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\begin_body
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\begin_layout Title
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\noun on
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noweb2lyx
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\end_layout
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\begin_layout Author
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Kayvan A.
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Sylvan <kayvan@sylvan.com>
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\end_layout
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\begin_layout Date
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May 6, 1999
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\end_layout
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\begin_layout Abstract
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This document describes and implements a perl script for importing noweb
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files into LyX
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\end_layout
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\begin_layout Standard
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\begin_inset LatexCommand tableofcontents
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\end_inset
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\end_layout
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\begin_layout Standard
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\newpage
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\end_layout
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\begin_layout Section
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Introduction
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\end_layout
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\begin_layout Standard
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Since version 1.0.1, LyX now supports Literate Programming using
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\noun on
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noweb
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\noun default
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.
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This addition to LyX made it very pleasant to write programs in the literate
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style (like this one).
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In addition to being able to write new literate programs, it would be quite
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useful if old
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\noun on
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noweb
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\noun default
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code could be imported into LyX in some fashion.
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That's where this program comes in.
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\end_layout
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\begin_layout Standard
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The purpose of
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\noun on
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noweb2lyx
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\noun default
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is to convert a
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\noun on
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noweb
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\noun default
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file to LyX.
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\end_layout
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\begin_layout Scrap
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<<noweb2lyx.in>>=
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\newline
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#!@PERL@
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\newline
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#
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\newline
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# Copyright (C) 1999 Kayvan A.
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Sylvan <kayvan@sylvan.com>
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\newline
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# You are free to use and modify this code under the terms of
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\newline
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# the GNU General Public Licence version 2 or later.
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\newline
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#
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\newline
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# Written with assistance from:
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\newline
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# Edmar Wienskoski Jr.
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<edmar-w-jr@technologist.com>
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\newline
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# Amir Karger <karger@post.harvard.edu>
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\newline
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#
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\newline
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# $Id: noweb2lyx.lyx,v 1.5 2005/07/18 09:42:27 jamatos Exp $
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\newline
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#
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\newline
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# NOTE: This file was automatically generated from noweb2lyx.lyx using noweb.
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\newline
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#
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\newline
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<<Setup variables from user supplied args>>
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\newline
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<<Subroutines>>
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\newline
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<<Convert noweb to LyX>>
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\newline
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@
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\end_layout
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\begin_layout Section
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The Noweb file defined
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\end_layout
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\begin_layout Standard
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A
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\noun on
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noweb
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\noun default
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file is a collection of documentation and code chunks.
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Documentation chunks simply start with an ``@'' and have no name:
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\end_layout
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\begin_layout LyX-Code
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@ Here is some documentation.
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\newline
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We can do arbitrary LaTeX code here.
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\newline
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[...
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blah blah blah ...]
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\end_layout
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\begin_layout Standard
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Code chunks look like this:
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\end_layout
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\begin_layout LyX-Code
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<
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\begin_inset ERT
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status collapsed
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\begin_layout Standard
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{}
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\end_layout
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\end_inset
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<Name of chunk here>
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\begin_inset ERT
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status collapsed
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\begin_layout Standard
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{}
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\end_layout
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\end_inset
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>=
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\newline
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{...
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code for the chunk goes here ...}
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\newline
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@
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\end_layout
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\begin_layout Standard
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The ``@'' is a necessary delimiter to end the code chunk.
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The other form that the ``@'' line takes is as follows:
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\end_layout
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\begin_layout LyX-Code
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<
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\begin_inset ERT
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status collapsed
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\begin_layout Standard
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{}
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\end_layout
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\end_inset
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<Name of chunk here>
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\begin_inset ERT
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status collapsed
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|
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\begin_layout Standard
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{}
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\end_layout
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\end_inset
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>=
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\newline
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{...
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code for the chunk ...}
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\newline
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@ %def identifier1 identifier2
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\end_layout
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\begin_layout Standard
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In the latter form, we are declaring to
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\noun on
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noweb
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\noun default
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that this code chunk defines identifier1, identifier2, etc.
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\end_layout
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\begin_layout Standard
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When first tackling this problem, I spoke with members of the LyX team that
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knew about the literate programming extensions and reLyX (the LaTeX importing
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code).
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\end_layout
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\begin_layout Standard
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One of the first ideas was to extend the reLyX code to understand the
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\noun on
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noweb
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\noun default
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code chunks.
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This proved to be too hard and presents other problems
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\begin_inset Foot
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status collapsed
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\begin_layout Standard
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Not the least of these problems is the fact that << is a quote in French.
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\end_layout
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\end_inset
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.
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On the other hand, it turns out that reLyX contains a very useful literal
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quoting mechanism.
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If the input file contains the construct
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\end_layout
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\begin_layout LyX-Code
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\backslash
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begin{reLyXskip}
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\newline
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{...
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LaTeX stuff ...}
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\newline
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\backslash
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end{reLyXskip}
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\end_layout
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\begin_layout Standard
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then reLyX will copy the surrounded code to the output file verbatim.
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Given this, the first part of the translation is easy; we simply have to
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copy the code chunks into an intermediate file that surrounds them with
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\family default
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\family typewriter
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\backslash
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begin{reLyXskip}
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\family default
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and
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\family default
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\family typewriter
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\backslash
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end{reLyXskip}
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\family default
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.
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\end_layout
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\begin_layout Standard
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Once reLyX is done with the input file, the problem is reduced to changing
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the code chunks from LyX's LaTeX layout to the Scrap layout.
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\end_layout
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\begin_layout Standard
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|
There is one final constraint on
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\noun on
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noweb2lyx
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\noun default
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.
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We want to be able to run it as a simple pre-processor and post-processor
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from within reLyX.
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We can accomplish this by setting the flags
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\family default
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\family roman
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\series medium
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\shape up
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\size normal
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\emph off
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\bar no
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\noun off
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\color none
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\begin_inset ERT
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status collapsed
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\begin_layout Standard
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[[pre_only]]
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\end_layout
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\end_inset
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\family default
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\series default
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\shape default
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\size default
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\emph default
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\bar default
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\noun default
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\color none
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\color inherit
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and
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\family default
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\color none
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\color inherit
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\family roman
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\series medium
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\shape up
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\size normal
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\emph off
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\bar no
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\noun off
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\color none
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\begin_inset ERT
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status collapsed
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\begin_layout Standard
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[[post_only]]
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\end_layout
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\end_inset
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\family default
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\series default
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\shape default
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\size default
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\emph default
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\bar default
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\noun default
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\color none
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\color inherit
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before we reach the main conversion code.
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\end_layout
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\begin_layout Standard
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With all that preamble out of the way, we now have the basic high-level
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outline for our code:
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\end_layout
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\begin_layout Scrap
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<<Convert noweb to LyX>>=
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\newline
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if (!$post_only) {
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\newline
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<<Transform noweb for reLyX>>
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\newline
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}
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\newline
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if ((!$pre_only) && (!$post_only)) {
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\newline
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<<Run reLyX on intermediate file>>
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\newline
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}
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\newline
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if (!$pre_only) {
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\newline
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<<Fix up LyX file>>
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\newline
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}
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\newline
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<<Clean up>>
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\newline
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@
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\end_layout
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\begin_layout Section
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Making a file that reLyX can process
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\end_layout
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\begin_layout Standard
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In this section, we present the code that performs the task of creating
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the intermediate file that reLyX can process, using the algorithm that
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we just outlined.
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This algorithm is outlined in the code that follows:
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\end_layout
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\begin_layout Scrap
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<<Transform noweb for reLyX>>=
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\newline
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<<Setup INPUT and OUTPUT>>
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\newline
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inputline: while(<INPUT>)
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\newline
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{
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\newline
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if (/^
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\backslash
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s*
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\backslash
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<
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\backslash
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<.*
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\backslash
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>
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\backslash
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>=/) { # Beginning of a noweb scrap
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\newline
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<<Read in and output the noweb code chunk>>
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\newline
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} elsif (/^@
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\backslash
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s+(.*)/) { # Beginning of a documentation chunk
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\newline
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print OUTPUT $1; # We do not need the ``@'' part
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\newline
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} elsif (/
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\backslash
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[
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\backslash
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[.+
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\backslash
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]
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\backslash
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]/) { # noweb quoted code
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\newline
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<<Perform special input quoting of [[var]]>>
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\newline
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} else {
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\newline
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print OUTPUT; # Just let the line pass through
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\newline
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}
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\newline
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}
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\newline
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<<Close INPUT and OUTPUT>>
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\newline
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@
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\end_layout
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\begin_layout Standard
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|
In the code above, we do some pre-processing of the noweb ``[[...]]'' construct.
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This avoids some problems with reLyX confusing lists composed of ``[[...]]''
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constructs.
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\end_layout
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\begin_layout Scrap
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|
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|
<<Perform special input quoting of [[var]]>>=
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\newline
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|
s/
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|
\backslash
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|
[
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\backslash
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[.+?
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\backslash
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]{2,}/{$&}/g;
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\newline
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print OUTPUT;
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\newline
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@
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\end_layout
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|
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|
\begin_layout Standard
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|
While reading in the
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\family default
|
|
|
|
\family roman
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|
\series medium
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|
\shape up
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|
\size normal
|
|
\emph off
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|
\bar no
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|
\noun off
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|
\color none
|
|
|
|
\begin_inset ERT
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|
status collapsed
|
|
|
|
\begin_layout Standard
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|
[[INPUT]]
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\end_layout
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|
|
|
\end_inset
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|
|
|
|
|
\family default
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|
\series default
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|
\shape default
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|
\size default
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|
\emph default
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|
\bar default
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|
\noun default
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|
\color none
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|
|
|
\color inherit
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file, once we have identified a
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\noun on
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|
noweb
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\noun default
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|
code chunk, we transform it into a form that is usable by reLyX.
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\end_layout
|
|
|
|
\begin_layout Scrap
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|
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|
<<Read in and output the noweb code chunk>>=
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|
\newline
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|
<<Save the beginning of the scrap to savedScrap>>
|
|
\newline
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|
<<Concatenate the rest of the scrap>>
|
|
\newline
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|
<<print out the scrap in a reLyXskip block>>
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\newline
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|
@
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\end_layout
|
|
|
|
\begin_layout Subsection
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|
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|
File input and output for the pre-processing step
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\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
In
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|
\noun on
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|
noweb2lyx
|
|
\noun default
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|
, we will use
|
|
\family default
|
|
|
|
\family roman
|
|
\series medium
|
|
\shape up
|
|
\size normal
|
|
\emph off
|
|
\bar no
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|
\noun off
|
|
\color none
|
|
|
|
\begin_inset ERT
|
|
status collapsed
|
|
|
|
\begin_layout Standard
|
|
[[INPUT]]
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
|
|
\family default
|
|
\series default
|
|
\shape default
|
|
\size default
|
|
\emph default
|
|
\bar default
|
|
\noun default
|
|
\color none
|
|
|
|
\color inherit
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|
and
|
|
\family default
|
|
\color none
|
|
|
|
\color inherit
|
|
\family roman
|
|
\series medium
|
|
\shape up
|
|
\size normal
|
|
\emph off
|
|
\bar no
|
|
\noun off
|
|
\color none
|
|
|
|
\begin_inset ERT
|
|
status collapsed
|
|
|
|
\begin_layout Standard
|
|
[[OUTPUT]]
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
|
|
\family default
|
|
\series default
|
|
\shape default
|
|
\size default
|
|
\emph default
|
|
\bar default
|
|
\noun default
|
|
\color none
|
|
|
|
\color inherit
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|
to read and write files.
|
|
In the code fragment above, we need to read from the input file and write
|
|
to a file that will be later transformed by reLyX.
|
|
If we are being called only to pre-process the input file, then there is
|
|
no need to create a temporary file.
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<Setup INPUT and OUTPUT>>=
|
|
\newline
|
|
if ($pre_only) {
|
|
\newline
|
|
&setup_files($input_file, $output_file);
|
|
\newline
|
|
} else {
|
|
\newline
|
|
$relyx_file = "temp$$";
|
|
\newline
|
|
&setup_files($input_file, $relyx_file);
|
|
\newline
|
|
}
|
|
\newline
|
|
@
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
This code uses a small perl subroutine,
|
|
\family default
|
|
|
|
\family roman
|
|
\series medium
|
|
\shape up
|
|
\size normal
|
|
\emph off
|
|
\bar no
|
|
\noun off
|
|
\color none
|
|
|
|
\begin_inset ERT
|
|
status collapsed
|
|
|
|
\begin_layout Standard
|
|
[[setup_files]]
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
|
|
\family default
|
|
\series default
|
|
\shape default
|
|
\size default
|
|
\emph default
|
|
\bar default
|
|
\noun default
|
|
\color inherit
|
|
, which we define below:
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<Subroutines>>=
|
|
\newline
|
|
sub setup_files {
|
|
\newline
|
|
my($in, $out) = @_;
|
|
\newline
|
|
open(INPUT, "<$in") || die "Cannot read $in: $!
|
|
\backslash
|
|
n";
|
|
\newline
|
|
open(OUTPUT, ">$out") || die "Cannot write $out: $!
|
|
\backslash
|
|
n";
|
|
\newline
|
|
}
|
|
\newline
|
|
@ %def setup_files
|
|
\end_layout
|
|
|
|
\begin_layout Subsection
|
|
|
|
Reading in the
|
|
\noun on
|
|
noweb
|
|
\noun default
|
|
scrap
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
After we see the beginning of the scrap, we need to read in and save the
|
|
rest of the scrap for output.
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<Save the beginning of the scrap to savedScrap>>=
|
|
\newline
|
|
$savedScrap = $_;
|
|
\newline
|
|
$endLine = "";
|
|
\newline
|
|
@
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<Concatenate the rest of the scrap>>=
|
|
\newline
|
|
scrapline: while (<INPUT>) {
|
|
\newline
|
|
last scrapline if /^@
|
|
\backslash
|
|
s+/;
|
|
\newline
|
|
$savedScrap .= $_;
|
|
\newline
|
|
};
|
|
\newline
|
|
switch: {
|
|
\newline
|
|
if (/^@
|
|
\backslash
|
|
s+$/) {$savedScrap .= $_; last switch; }
|
|
\newline
|
|
if (/^@
|
|
\backslash
|
|
s+%def.*$/) {$savedScrap .= $_; last switch; }
|
|
\newline
|
|
if (/^@
|
|
\backslash
|
|
s+(.*)$/) {$savedScrap .= "@
|
|
\backslash
|
|
n"; $endLine = "$1
|
|
\backslash
|
|
n"; }
|
|
\newline
|
|
}
|
|
\newline
|
|
@
|
|
\end_layout
|
|
|
|
\begin_layout Subsection
|
|
|
|
Printing out the scrap
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
The final piece of the first pass of the conversion is done by this code.
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<print out the scrap in a reLyXskip block>>=
|
|
\newline
|
|
print OUTPUT "
|
|
\backslash
|
|
|
|
\backslash
|
|
begin{reLyXskip}
|
|
\backslash
|
|
n";
|
|
\newline
|
|
print OUTPUT $savedScrap;
|
|
\newline
|
|
print OUTPUT "
|
|
\backslash
|
|
|
|
\backslash
|
|
end{reLyXskip}
|
|
\backslash
|
|
n
|
|
\backslash
|
|
n";
|
|
\newline
|
|
print OUTPUT "$endLine";
|
|
\newline
|
|
@
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
Finally, we need to close the
|
|
\family default
|
|
|
|
\family roman
|
|
\series medium
|
|
\shape up
|
|
\size normal
|
|
\emph off
|
|
\bar no
|
|
\noun off
|
|
\color none
|
|
|
|
\begin_inset ERT
|
|
status collapsed
|
|
|
|
\begin_layout Standard
|
|
[[INPUT]]
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
|
|
\family default
|
|
\series default
|
|
\shape default
|
|
\size default
|
|
\emph default
|
|
\bar default
|
|
\noun default
|
|
\color none
|
|
|
|
\color inherit
|
|
and
|
|
\family default
|
|
\color none
|
|
|
|
\color inherit
|
|
\family roman
|
|
\series medium
|
|
\shape up
|
|
\size normal
|
|
\emph off
|
|
\bar no
|
|
\noun off
|
|
\color none
|
|
|
|
\begin_inset ERT
|
|
status collapsed
|
|
|
|
\begin_layout Standard
|
|
[[OUTPUT]]
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
|
|
\family default
|
|
\series default
|
|
\shape default
|
|
\size default
|
|
\emph default
|
|
\bar default
|
|
\noun default
|
|
\color none
|
|
|
|
\color inherit
|
|
files.
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<Close INPUT and OUTPUT>>=
|
|
\newline
|
|
close(INPUT);
|
|
\newline
|
|
close(OUTPUT);
|
|
\newline
|
|
@
|
|
\end_layout
|
|
|
|
\begin_layout Section
|
|
|
|
Running reLyX
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
In this section, we describe and implement the code that runs reLyX on the
|
|
intermediate file
|
|
\family default
|
|
|
|
\family roman
|
|
\series medium
|
|
\shape up
|
|
\size normal
|
|
\emph off
|
|
\bar no
|
|
\noun off
|
|
\color none
|
|
|
|
\begin_inset ERT
|
|
status collapsed
|
|
|
|
\begin_layout Standard
|
|
[[relyx_file]]
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
|
|
\family default
|
|
\series default
|
|
\shape default
|
|
\size default
|
|
\emph default
|
|
\bar default
|
|
\noun default
|
|
\color inherit
|
|
.
|
|
|
|
\end_layout
|
|
|
|
\begin_layout Subsection
|
|
|
|
Selecting the document class
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
In order to run reLyX, we need to know the article class of the input document
|
|
(to choose the corresponding literate document layout).
|
|
For this, we need to parse the intermediate file.
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<Run reLyX on intermediate file>>=
|
|
\newline
|
|
<<Parse for document class>>
|
|
\newline
|
|
<<Run reLyX with document class>>
|
|
\newline
|
|
@
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
In the code below, you'll see a strange regular expression to search for
|
|
the document class.
|
|
The reason for this kludge is that without it, we can't run
|
|
\noun on
|
|
noweb2lyx
|
|
\noun default
|
|
on the
|
|
\emph default
|
|
|
|
\emph on
|
|
noweb2lyx.nw
|
|
\emph default
|
|
file that is generated by LyX
|
|
\begin_inset Foot
|
|
status collapsed
|
|
|
|
\begin_layout Standard
|
|
|
|
reLyX searches for
|
|
\backslash
|
|
|
|
\backslash
|
|
doc
|
|
\family roman
|
|
\series medium
|
|
\shape up
|
|
\size normal
|
|
\emph off
|
|
\bar no
|
|
\noun off
|
|
\color none
|
|
|
|
\begin_inset ERT
|
|
status collapsed
|
|
|
|
\begin_layout Standard
|
|
{}
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
|
|
\family default
|
|
\series default
|
|
\shape default
|
|
\size default
|
|
\emph default
|
|
\bar default
|
|
\noun default
|
|
\color inherit
|
|
ument
|
|
\family roman
|
|
\series medium
|
|
\shape up
|
|
\size normal
|
|
\emph off
|
|
\bar no
|
|
\noun off
|
|
\color none
|
|
|
|
\begin_inset ERT
|
|
status collapsed
|
|
|
|
\begin_layout Standard
|
|
{}
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
|
|
\family default
|
|
\series default
|
|
\shape default
|
|
\size default
|
|
\emph default
|
|
\bar default
|
|
\noun default
|
|
\color inherit
|
|
class and gets confused, so we have to obfuscate it slightly.
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
.
|
|
With the regular expression as it is, we can actually run
|
|
\noun on
|
|
noweb2lyx
|
|
\noun default
|
|
on itself and a produce a quite reasonable LyX file.
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<Parse for document class>>=
|
|
\newline
|
|
open(INPUT, "<$relyx_file") ||
|
|
\newline
|
|
die "Cannot read $relyx_file: $!
|
|
\backslash
|
|
n";
|
|
\newline
|
|
$class = "article"; # default if none found
|
|
\newline
|
|
parse: while(<INPUT>) {
|
|
\newline
|
|
if (/
|
|
\backslash
|
|
|
|
\backslash
|
|
docu[m]entclass{(.*)}/) {
|
|
\newline
|
|
$class = $1;
|
|
\newline
|
|
last parse;
|
|
\newline
|
|
}
|
|
\newline
|
|
}
|
|
\newline
|
|
close(INPUT);
|
|
\newline
|
|
@
|
|
\end_layout
|
|
|
|
\begin_layout Subsection
|
|
|
|
Running reLyX with the corresponding literate document layout
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
Now that we know what the document class ought to be, we do:
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<Run reLyX with document class>>=
|
|
\newline
|
|
$doc_class = "literate-" .
|
|
$class;
|
|
\newline
|
|
die "reLyX returned non-zero: $!
|
|
\backslash
|
|
n"
|
|
\newline
|
|
if (system("reLyX -c $doc_class $relyx_file"));
|
|
\newline
|
|
@
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
reLyX performs the main bulk of the translation work.
|
|
Note that if the ``literate-
|
|
\emph on
|
|
class
|
|
\emph default
|
|
'' document layout is not found, then reLyX will fail with an error.
|
|
In that case, you may need to modify your
|
|
\noun on
|
|
noweb
|
|
\noun default
|
|
input file to a supported document type.
|
|
\end_layout
|
|
|
|
\begin_layout Section
|
|
|
|
Fixing the reLyX output
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
We need to perform some post-processing of what reLyX produces in order
|
|
to have the best output for our literate document.
|
|
The outline of the post-processing steps are:
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<Fix up LyX file>>=
|
|
\newline
|
|
<<Setup INPUT and OUTPUT for the final output>>
|
|
\newline
|
|
line: while(<INPUT>)
|
|
\newline
|
|
{
|
|
\newline
|
|
<<Fix code chunks in latex layout>>
|
|
\newline
|
|
<<Fix [[var]] noweb construct>>
|
|
\newline
|
|
print OUTPUT; # default
|
|
\newline
|
|
}
|
|
\newline
|
|
<<Close INPUT and OUTPUT>>
|
|
\newline
|
|
@
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
Note that in the perl code that is contained in the
|
|
\family default
|
|
|
|
\family roman
|
|
\series medium
|
|
\shape up
|
|
\size normal
|
|
\emph off
|
|
\bar no
|
|
\noun off
|
|
\color none
|
|
|
|
\begin_inset ERT
|
|
status collapsed
|
|
|
|
\begin_layout Standard
|
|
[[while(<INPUT>)]]
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
|
|
\family default
|
|
\series default
|
|
\shape default
|
|
\size default
|
|
\emph default
|
|
\bar default
|
|
\noun default
|
|
\color none
|
|
|
|
\color inherit
|
|
loop above, the perl construct
|
|
\family default
|
|
\color none
|
|
|
|
\color inherit
|
|
\family roman
|
|
\series medium
|
|
\shape up
|
|
\size normal
|
|
\emph off
|
|
\bar no
|
|
\noun off
|
|
\color none
|
|
|
|
\begin_inset ERT
|
|
status collapsed
|
|
|
|
\begin_layout Standard
|
|
[[next line]]
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
|
|
\family default
|
|
\series default
|
|
\shape default
|
|
\size default
|
|
\emph default
|
|
\bar default
|
|
\noun default
|
|
\color none
|
|
|
|
\color inherit
|
|
is sufficient to restart the loop.
|
|
We can use this construct to do some relatively complex parsing of the
|
|
reLyX generated file.
|
|
\end_layout
|
|
|
|
\begin_layout Subsection
|
|
|
|
File input and output for the post-processing
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
Setting up the
|
|
\family default
|
|
|
|
\family roman
|
|
\series medium
|
|
\shape up
|
|
\size normal
|
|
\emph off
|
|
\bar no
|
|
\noun off
|
|
\color none
|
|
|
|
\begin_inset ERT
|
|
status collapsed
|
|
|
|
\begin_layout Standard
|
|
[[INPUT]]
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
|
|
\family default
|
|
\series default
|
|
\shape default
|
|
\size default
|
|
\emph default
|
|
\bar default
|
|
\noun default
|
|
\color none
|
|
|
|
\color inherit
|
|
and
|
|
\family default
|
|
\color none
|
|
|
|
\color inherit
|
|
\family roman
|
|
\series medium
|
|
\shape up
|
|
\size normal
|
|
\emph off
|
|
\bar no
|
|
\noun off
|
|
\color none
|
|
|
|
\begin_inset ERT
|
|
status collapsed
|
|
|
|
\begin_layout Standard
|
|
[[OUTPUT]]
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
|
|
\family default
|
|
\series default
|
|
\shape default
|
|
\size default
|
|
\emph default
|
|
\bar default
|
|
\noun default
|
|
\color none
|
|
|
|
\color inherit
|
|
is taken care of by this code:
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<Setup INPUT and OUTPUT for the final output>>=
|
|
\newline
|
|
if ($post_only) {
|
|
\newline
|
|
&setup_files("$input_file", "$output_file");
|
|
\newline
|
|
} else {
|
|
\newline
|
|
&setup_files("$relyx_file.lyx", "$output_file");
|
|
\newline
|
|
}
|
|
\newline
|
|
@
|
|
\end_layout
|
|
|
|
\begin_layout Subsection
|
|
|
|
Making sure the code chunks are in the Scrap layout
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
Now, as we outlined before, the final step is transforming the code-chunks
|
|
which have been put into a LaTeX layout by LyX into the scrap layout.
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<Fix code chunks in latex layout>>=
|
|
\newline
|
|
if (/
|
|
\backslash
|
|
|
|
\backslash
|
|
latex latex/) { # Beginning of some latex code
|
|
\newline
|
|
if (($line = <INPUT>) =~ /^
|
|
\backslash
|
|
s*<</) { # code scrap
|
|
\newline
|
|
<<Transform this chunk into layout scrap>>
|
|
\newline
|
|
} else {
|
|
\newline
|
|
# print the
|
|
\backslash
|
|
latex latex line + next line
|
|
\newline
|
|
print OUTPUT "$_$line";
|
|
\newline
|
|
}
|
|
\newline
|
|
next line;
|
|
\newline
|
|
}
|
|
\newline
|
|
@
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
When we are sure that we are in a code chunk, we must read in the rest of
|
|
the code chunk and output a scrap layout for it:
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<Transform this chunk into layout scrap>>=
|
|
\newline
|
|
$savedScrap = "
|
|
\backslash
|
|
|
|
\backslash
|
|
layout Scrap
|
|
\backslash
|
|
n
|
|
\backslash
|
|
n$line";
|
|
\newline
|
|
codeline: while (<INPUT>) {
|
|
\newline
|
|
$savedScrap .= $_;
|
|
\newline
|
|
last codeline if /^@
|
|
\backslash
|
|
s+/;
|
|
\newline
|
|
};
|
|
\newline
|
|
print OUTPUT $savedScrap;
|
|
\newline
|
|
<<Slurp up to the end of the latex layout>>
|
|
\newline
|
|
@
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
Okay, now we just need to eat the rest of the latex layout.
|
|
There should only be a few different types of lines for us to match:
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<Slurp up to the end of the latex layout>>=
|
|
\newline
|
|
slurp: while (<INPUT>) {
|
|
\newline
|
|
last slurp if /
|
|
\backslash
|
|
|
|
\backslash
|
|
latex /;
|
|
\newline
|
|
next slurp if /
|
|
\backslash
|
|
|
|
\backslash
|
|
newline/;
|
|
\newline
|
|
next slurp if /^
|
|
\backslash
|
|
s*$/;
|
|
\newline
|
|
warn "confused by line: $_";
|
|
\newline
|
|
}
|
|
\newline
|
|
@
|
|
\end_layout
|
|
|
|
\begin_layout Subsection
|
|
|
|
Taking care of the
|
|
\noun on
|
|
noweb
|
|
\noun default
|
|
|
|
\emph default
|
|
|
|
\emph on
|
|
[[quoted code]]
|
|
\emph default
|
|
construct
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
|
|
\noun on
|
|
noweb
|
|
\noun default
|
|
allows the user to use a special code quoting mechanism in documentation
|
|
chunks.
|
|
Fixing this ``[[quoted-code]]''
|
|
\noun on
|
|
noweb
|
|
\noun default
|
|
syntax means putting the ``[[quoted-code]]'' in a LaTeX layout in the LyX
|
|
file.
|
|
Otherwise, LyX will backslash-quote the brackets, creating ugly output.
|
|
The quoted-code is transformed by
|
|
\noun on
|
|
noweb
|
|
\noun default
|
|
when it generates the final LaTeX code.
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<Fix [[var]] noweb construct>>=
|
|
\newline
|
|
if (/
|
|
\backslash
|
|
[
|
|
\backslash
|
|
[.+
|
|
\backslash
|
|
]
|
|
\backslash
|
|
]/) { # special code for [[var]]
|
|
\newline
|
|
s/
|
|
\backslash
|
|
[
|
|
\backslash
|
|
[.+?
|
|
\backslash
|
|
]{2,}/
|
|
\backslash
|
|
n
|
|
\backslash
|
|
|
|
\backslash
|
|
latex latex
|
|
\backslash
|
|
n$&
|
|
\backslash
|
|
n
|
|
\backslash
|
|
|
|
\backslash
|
|
latex default
|
|
\backslash
|
|
n/g;
|
|
\newline
|
|
print OUTPUT;
|
|
\newline
|
|
next line;
|
|
\newline
|
|
}
|
|
\newline
|
|
@
|
|
\end_layout
|
|
|
|
\begin_layout Section
|
|
|
|
Cleaning up intermediate files
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
The cleanup code is very simple:
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<Clean up>>=
|
|
\newline
|
|
system("rm -f $relyx_file*") unless ($post_only || $pre_only);
|
|
\newline
|
|
@
|
|
\end_layout
|
|
|
|
\begin_layout Section
|
|
|
|
User supplied arguments
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
The
|
|
\noun on
|
|
noweb2lyx
|
|
\noun default
|
|
script understands two arguments, input-file and output-file.
|
|
It is also set up to be used internally by reLyX to pre-process or postprocess
|
|
files in the import pipeline.
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<Setup variables from user supplied args>>=
|
|
\newline
|
|
&usage() if ($#ARGV < 1); # zero or one argument
|
|
\newline
|
|
if ($ARGV[0] eq "-pre") {
|
|
\newline
|
|
&usage unless ($#ARGV == 2);
|
|
\newline
|
|
$input_file = $ARGV[1]; $output_file = $ARGV[2]; $pre_only = 1;
|
|
\newline
|
|
} elsif ($ARGV[0] eq "-post") {
|
|
\newline
|
|
&usage unless ($#ARGV == 2);
|
|
\newline
|
|
$input_file = $ARGV[1]; $output_file = $ARGV[2]; $post_only = 1;
|
|
\newline
|
|
} else {
|
|
\newline
|
|
&usage unless ($#ARGV == 1);
|
|
\newline
|
|
$input_file = $ARGV[0]; $output_file = $ARGV[1];
|
|
\newline
|
|
$pre_only = 0; $post_only = 0;
|
|
\newline
|
|
}
|
|
\newline
|
|
@ %def input_file output_file pre_only post_only
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<Subroutines>>=
|
|
\newline
|
|
sub usage() {
|
|
\newline
|
|
print "Usage: noweb2lyx [-pre | -post] input-file output-file
|
|
\newline
|
|
|
|
\newline
|
|
If -pre is specified, only pre-processes the input-file for reLyX.
|
|
\newline
|
|
Similarly, in the case of -post, post-processes reLyX output.
|
|
\newline
|
|
In case of bugs, Email Kayvan Sylvan <kayvan
|
|
\backslash
|
|
@sylvan.com>.
|
|
\backslash
|
|
n";
|
|
\newline
|
|
exit;
|
|
\newline
|
|
}
|
|
\newline
|
|
@ %def usage
|
|
\end_layout
|
|
|
|
\begin_layout Section
|
|
|
|
Generating the
|
|
\noun on
|
|
noweb2lyx
|
|
\noun default
|
|
script
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
The noweb2lyx script can be tangled from LyX if you set
|
|
\family default
|
|
|
|
\family typewriter
|
|
|
|
\backslash
|
|
build_command
|
|
\family default
|
|
to call a generic script that always extracts a scrap named
|
|
\family default
|
|
|
|
\family typewriter
|
|
build-script
|
|
\family default
|
|
and executes it.
|
|
Here is an example of such a script:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
#!/bin/sh
|
|
\newline
|
|
notangle -Rbuild-script $1 | sh
|
|
\end_layout
|
|
|
|
\begin_layout Scrap
|
|
|
|
<<build-script>>=
|
|
\newline
|
|
PREFIX=/usr
|
|
\newline
|
|
notangle -Rnoweb2lyx.in noweb2lyx.nw > noweb2lyx.in
|
|
\newline
|
|
sed -e "s=@PERL@=$PREFIX/bin/perl=" noweb2lyx.in > noweb2lyx
|
|
\newline
|
|
chmod +x noweb2lyx
|
|
\newline
|
|
@
|
|
\end_layout
|
|
|
|
|
|
\begin_layout Standard
|
|
|
|
|
|
\newpage
|
|
|
|
\end_layout
|
|
|
|
\begin_layout Section*
|
|
|
|
Macros
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
|
|
\family roman
|
|
\series medium
|
|
\shape up
|
|
\size normal
|
|
\emph off
|
|
\bar no
|
|
\noun off
|
|
\color none
|
|
|
|
\begin_inset ERT
|
|
status collapsed
|
|
|
|
\begin_layout Standard
|
|
|
|
\backslash
|
|
nowebchunks
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
|
|
\end_layout
|
|
|
|
\begin_layout Section*
|
|
|
|
Identifiers
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
|
|
|
|
\family roman
|
|
\series medium
|
|
\shape up
|
|
\size normal
|
|
\emph off
|
|
\bar no
|
|
\noun off
|
|
\color none
|
|
|
|
\begin_inset ERT
|
|
status collapsed
|
|
|
|
\begin_layout Standard
|
|
|
|
\backslash
|
|
nowebindex
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
|
|
\end_layout
|
|
|
|
\end_body
|
|
\end_document
|