mirror of
https://git.lyx.org/repos/lyx.git
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68dfd684ce
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@36158 a592a061-630c-0410-9148-cb99ea01b6c8
1912 lines
32 KiB
Plaintext
1912 lines
32 KiB
Plaintext
#LyX 2.0.0svn created this file. For more info see http://www.lyx.org/
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\lyxformat 405
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\begin_document
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\begin_header
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\textclass article
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\use_default_options true
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\begin_modules
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logicalmkup
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\end_modules
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\maintain_unincluded_children false
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\language english
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\inputencoding auto
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\fontencoding global
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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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\use_xetex false
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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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\default_output_format default
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\output_sync 0
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\bibtex_command default
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\index_command default
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\paperfontsize default
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\spacing single
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\use_hyperref false
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\papersize default
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\use_geometry false
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\use_amsmath 1
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\use_esint 1
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\use_mhchem 1
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\use_mathdots 1
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\cite_engine basic
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\use_bibtopic false
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\use_indices false
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\paperorientation portrait
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\suppress_date false
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\use_refstyle 1
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\index Index
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\shortcut idx
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\color #008000
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\end_index
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\secnumdepth 3
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\tocdepth 3
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\paragraph_separation indent
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\paragraph_indentation default
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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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\html_math_output 0
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\html_be_strict false
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\end_header
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\begin_body
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\begin_layout Title
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Programming lyx2lyx
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\end_layout
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\begin_layout Author
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Richard Heck
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\end_layout
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\begin_layout Standard
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Contained herein are some observations and suggestions about how to write
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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lyx2lyx
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\end_layout
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\end_inset
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routines, including some thoughts about common pitfalls.
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\end_layout
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\begin_layout Section
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The LyX_base Class
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\end_layout
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\begin_layout Standard
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Conversion and reversion routines will always be defined as functions that
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take an object of type
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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LyX_base
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\end_layout
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\end_inset
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as argument.
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This argument, conventionally called
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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document
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\end_layout
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\end_inset
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, represents the LyX document being converted.
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The
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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LyX_base
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\end_layout
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\end_inset
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class is defined in the file
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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LyX.py
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\end_layout
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\end_inset
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, and it has several properties and a number of methods.
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\end_layout
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\begin_layout Standard
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Some of the most important properties are:
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\end_layout
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\begin_layout Description
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backend Either
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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linuxdoc
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\end_layout
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\end_inset
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,
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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docbook
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\end_layout
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\end_inset
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, or
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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latex
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\end_layout
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\end_inset
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, depending upon the document class
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\end_layout
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\begin_layout Description
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textclass The layout file for this document, e.g.,
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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article
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\end_layout
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\end_inset
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.
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\end_layout
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\begin_layout Description
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default_layout The default layout style for the class.
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\begin_inset Newline newline
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\end_inset
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Note that this is all
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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lyx2lyx
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\end_layout
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\end_inset
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knows about the layout.
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It does not know what paragraph styles are available, for example, let
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alone what their properties might be.
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\end_layout
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\begin_layout Description
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encoding The document encoding.
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\end_layout
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\begin_layout Description
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language The document language.
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\end_layout
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\begin_layout Standard
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These three represent the content of the document.
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\end_layout
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\begin_layout Description
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header The document header, meaning the lines that come before
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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\backslash
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begin_body
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\end_layout
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\end_inset
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,
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\emph on
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except
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\emph default
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for the LaTeX preamble.
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\end_layout
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\begin_layout Description
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preamble The LaTeX preamble.
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\end_layout
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\begin_layout Description
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body The document body.
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\end_layout
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\begin_layout Standard
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All three of these are lists of strings.
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The importance of this point will be discussed later.
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\end_layout
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\begin_layout Standard
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Important methods include:
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\end_layout
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\begin_layout Description
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warning Writes its argument to the console as a warning.
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(Also takes an optional argument, the debug level, which can be used to
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suppress output below a certain debug level, but this is rarely used.)
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\end_layout
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\begin_layout Description
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error Writes the warning and exits, unless we are in try_hard mode, which
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is set with a command-line option.
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Rarely used in converter code, but I shall mention times it might be used
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below.
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\end_layout
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\begin_layout Description
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set_parameter Sets the value of a header parameter.
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This needs to be a parameter already present in the header or nothing will
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happen.
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\end_layout
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\begin_layout Description
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set_textclass This writes the value of the
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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textclass
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\end_layout
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\end_inset
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member variable to the header.
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So, for example, one might have something like this in a reversion routine:
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\end_layout
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\begin_layout LyX-Code
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if document.textclass = 'fancy_new_class':
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\end_layout
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\begin_layout LyX-Code
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document.textclass = 'old_class'
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\end_layout
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|
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\begin_layout LyX-Code
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document.setclass()
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\end_layout
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\begin_layout Description
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add_module Adds a LyX module to the list of modules to be loaded with the
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document.
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\end_layout
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\begin_layout Description
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get_module_list Returns the list of modules to be loaded.
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\end_layout
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|
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\begin_layout Description
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set_module_list Takes a list as argument and replaces the existing list
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of modules.
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\end_layout
|
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|
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\begin_layout Standard
|
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There are some other methods, too, such as
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\begin_inset Flex Code
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status collapsed
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|
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\begin_layout Plain Layout
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read()
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\end_layout
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\end_inset
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, but those are more for `internal' use.
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\end_layout
|
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|
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\begin_layout Standard
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It is extremely important to understand that
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\begin_inset Flex Code
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status collapsed
|
|
|
|
\begin_layout Plain Layout
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lyx2lyx
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\end_layout
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\end_inset
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is
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\emph on
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line-oriented
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\emph default
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.
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That is,
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\begin_inset Flex Code
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status collapsed
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|
|
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\begin_layout Plain Layout
|
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lyx2lyx
|
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\end_layout
|
|
|
|
\end_inset
|
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represents the content of a LyX file---the header, preamble, and body---as
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lists of lines.
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It is critical that one maintain this structure when modifying the document.
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Since Python is not type-safe, one can easily fail to do so if one is not
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careful, and this will cause problems.
|
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\end_layout
|
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|
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\begin_layout Standard
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|
For example, one must absolutely never do anything like this:
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\end_layout
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\begin_layout LyX-Code
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newstuff = '
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\backslash
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\backslash
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begin_inset ERT
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\backslash
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n, status collapsed
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\backslash
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n
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\backslash
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\end_layout
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\begin_layout LyX-Code
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\backslash
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\backslash
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begin_layout Plain Layout
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\backslash
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n
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\backslash
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nI am in ERT
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\backslash
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n
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\backslash
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\end_layout
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\begin_layout LyX-Code
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\backslash
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\backslash
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end_layout
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\backslash
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n
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\backslash
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n
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\backslash
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\backslash
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end_inset
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\backslash
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n
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\backslash
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n'
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\end_layout
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\begin_layout LyX-Code
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document.body[i:i] = newstuff
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\end_layout
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\begin_layout Standard
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This is supposed to insert an InsetERT at line i of the document, and in
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a sense it will.
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But it has the potential to confuse
|
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\begin_inset Flex Code
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status collapsed
|
|
|
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\begin_layout Plain Layout
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lyx2lyx
|
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\end_layout
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\end_inset
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very badly.
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Suppose at some later point in the conversion we want to change
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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\backslash
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begin_layout Plain Layout
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\end_layout
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\end_inset
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to
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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\backslash
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begin_layout PlainLayout
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\end_layout
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\end_inset
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.
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(In fact, this is actually done.) Then we are going to have code that looks
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like:
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\end_layout
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\begin_layout LyX-Code
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i = find_token(document.body, '
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\backslash
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\backslash
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begin_layout Plain Layout', i)
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\end_layout
|
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\begin_layout Standard
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This will not find the occurence of
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\begin_inset Flex Code
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status collapsed
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|
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\begin_layout Plain Layout
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\backslash
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begin_layout Plain Layout
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\end_layout
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\end_inset
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that we just inserted.
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This is because
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\begin_inset Flex Code
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status collapsed
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\begin_layout Plain Layout
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find_token
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\end_layout
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\end_inset
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looks for things at the beginning of lines, and
|
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\begin_inset Flex Code
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status collapsed
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|
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\begin_layout Plain Layout
|
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\backslash
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begin_layout Plain Layout
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\end_layout
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\end_inset
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|
is not at the beginning of the long string
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\begin_inset Flex Code
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status collapsed
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|
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\begin_layout Plain Layout
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newstuff
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\end_layout
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\end_inset
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.
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It follows a newline, to be sure, but that is different.
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So what one should do instead is:
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\end_layout
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\begin_layout LyX-Code
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newstuff = ['
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\backslash
|
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|
|
\backslash
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begin_inset ERT', 'status collapsed',
|
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\end_layout
|
|
|
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\begin_layout LyX-Code
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'
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\backslash
|
|
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|
\backslash
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begin_layout Plain Layout', '', 'I am in ERT',
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\end_layout
|
|
|
|
\begin_layout LyX-Code
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|
'
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\backslash
|
|
|
|
\backslash
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end_layout', '', '
|
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\backslash
|
|
|
|
\backslash
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end_inset', '']
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\end_layout
|
|
|
|
\begin_layout LyX-Code
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document.body[i:i] = newstuff
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\end_layout
|
|
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|
\begin_layout Standard
|
|
That inserts a bunch of lines.
|
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\end_layout
|
|
|
|
\begin_layout Section
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|
Utility Functions
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
There are two Python modules that provide commonly used functions for parsing
|
|
the file and for modifying it.
|
|
The parsing functions are in
|
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\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
parser_tools
|
|
\end_layout
|
|
|
|
\end_inset
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|
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|
and the modifying functions are in
|
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\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
lyx2lyx_tools
|
|
\end_layout
|
|
|
|
\end_inset
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|
|
|
.
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|
Both of these files have extensive documentation at the beginning that
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lists the functions that are available and explains what they do.
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|
Those writing
|
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\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
lyx2lyx
|
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\end_layout
|
|
|
|
\end_inset
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|
|
|
code should familiarize themselves with these functions.
|
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\end_layout
|
|
|
|
\begin_layout Section
|
|
Common Code Structures and Pitfalls
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
As said, reversion routines receive an argument of type
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
LyX_base
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
, and they almost always have one of two sorts of structure, depending upon
|
|
whether it is the header or the body that one is modifying.
|
|
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
If it is the header, then the routine can be quite simple, because items
|
|
usually occur in the header only once.
|
|
So the structure will typically be:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
def revert_header_stuff(document):
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\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i = find_token(document.header, '
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\backslash
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|
use_xetex', 0)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if i == -1:
|
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\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
# not found
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
document.warning('Hmm')
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
else:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
# do something with line i
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\end_layout
|
|
|
|
\begin_layout Standard
|
|
How complex such routines become depends of course on the case.
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
If the changes will be made to the body, then the routine usually has this
|
|
sort of structure:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
def revert_something(document):
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i = 0
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
while True:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i = find_token(document.body, '
|
|
\backslash
|
|
begin_inset Funky', i)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if i == -1:
|
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\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
break
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
# do something ...
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i += 1 # or other appropriate reset
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
In some cases, one may need both sorts of routines together.
|
|
\end_layout
|
|
|
|
\begin_layout Subsection
|
|
Where Am I?
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
In the course of doing something in this last case, one will often want
|
|
to look for content in the inset or layout (or whatever) that one has found.
|
|
Suppose, for example, that one is trying to remove the option
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
newoption
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
from Funky insets.
|
|
Then one might think to use code like this in place of the comment.
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
j = find_token(document.body, 'newoption', i)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if j == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
document.warning('UnFunky inset!')
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
break
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
del document.body[j]
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
This is terrible code, for several reasons.
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
First, it is wrong to break on the error here.
|
|
The LyX file is corrupted, yes.
|
|
But that does not necessarily mean that it is unusable---LyX is pretty
|
|
forgiving---and just because we have failed to find this one option does
|
|
not mean we should give up.
|
|
We at least need to try to remove the option from other Funky insets.
|
|
So the right think to do here is instead:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
j = find_token(document.body, 'newoption', i)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if j == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
document.warning('UnFunky inset!')
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i += 1
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
continue
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
del document.body[j]
|
|
\end_layout
|
|
|
|
\begin_layout --Separator--
|
|
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
The second problem is that we have no way of knowing that the line we find
|
|
here is actually a line containing an option for the Funky inset on line
|
|
i.
|
|
Suppose this inset is missing its
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
newoption
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
.
|
|
There might be a later one that has a
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
newoption
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
.
|
|
Then
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
find_token
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
will find the
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
newoption
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
for the later one.
|
|
If we're just removing it, that might not be so bad.
|
|
But if we were doing something more extensive, it could be.
|
|
So, at the very least, we need to find the end of this inset and make sure
|
|
the option comes before that:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
k = find_end_of_inset(document.body, i)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if k == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
document.warning('No end to Funky inset!')
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i += 1
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
continue
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
j = find_token(document.body, 'newoption', i, k)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if j == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
document.warning('UnFunky inset!')
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i = k
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
continue
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
del document.body[j]
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
Note that we can reset
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
i
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
to
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
k
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
here only if we know that no Funky inset can occur inside a Funky inset.
|
|
Otherwise, it should have been
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
i += 1
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
, again.
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
By the way, although it is not often done, there are definitely cases where
|
|
we should use
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
document.error()
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
rather than
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
document.warning()
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
.
|
|
In particular, suppose that we are actually planning to remove Funky insets
|
|
altogether, or to replace them with ERT.
|
|
Then, if the file is so corrupt that we cannot find the end of the inset,
|
|
we cannot do this work, so we
|
|
\emph on
|
|
know
|
|
\emph default
|
|
we cannot produce a LyX file an older version will be able to load.
|
|
In that case, it seems right just to abort, and if the user wants to
|
|
\begin_inset Quotes eld
|
|
\end_inset
|
|
|
|
try hard
|
|
\begin_inset Quotes erd
|
|
\end_inset
|
|
|
|
, she can run
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
lyx2lyx
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
from the command line and pass the appropriate opttion.
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
The routine above may still fail to do the right thing, however.
|
|
Suppose again that
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
newoption
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
is missing, but, due to a strange typo, one of the lines of text in the
|
|
inset happens to begin with
|
|
\begin_inset Quotes eld
|
|
\end_inset
|
|
|
|
newoption
|
|
\begin_inset Quotes erd
|
|
\end_inset
|
|
|
|
.
|
|
Then
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
find_token
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
will find that line and we will remove text from the document! This will
|
|
not generally happen with command insets, but it can easily happen with
|
|
text insets.
|
|
In that case, one has to make sure the option comes before the content
|
|
of the inset, and to do that, we must find the first layout in the inset,
|
|
thus:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
k = find_end_of_inset(document.body, i)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if k == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
document.warning('No end to Funky inset!')
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i += 1
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
continue
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
m = find_token(document.body, '
|
|
\backslash
|
|
|
|
\backslash
|
|
begin_layout', i, k)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if m == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
document.warning('No layout! Hope for the best!')
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
m = k
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
j = find_token(document.body, 'newoption', i, m)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if j == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
document.warning('UnFunky inset!')
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i = k
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
continue
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
del document.body[j]
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
Note the response here to
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
m != 1
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
.
|
|
There is not necessarily a need to give up trying to remove the option.
|
|
What the right response is will depend upon the specific case.
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
The last problem, though it would be unlikely in this case, is that we might
|
|
find not
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
newoption
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
but
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
newoptions
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
, because
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
find_token
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
only looks to see if the beginning of the line matches.
|
|
Typically, then, what one really wants is
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
find_token_exact
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
, which makes sure that we are finding a complete token.
|
|
\begin_inset Foot
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
In the implementation in LyX 2.0svn and earlier, this function also ignores
|
|
other differences in whitespace.
|
|
This needs to be fixed and will be once 2.0 is out.
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
So what we really want, for the entire function, is:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
def revert_something(document):
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i = 0
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
while True:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i = find_token(document.body, '
|
|
\backslash
|
|
begin_inset Funky', i)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if i == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
break
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
k = find_end_of_inset(document.body, i)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if k == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
document.warning('No end to Funky inset!')
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i += 1
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
continue
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
m = find_token(document.body, '
|
|
\backslash
|
|
|
|
\backslash
|
|
begin_layout', i, k)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if m == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
document.warning('No layout! Hope for the best!')
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
m = k
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
j = find_token(document.body, 'newoption', i, m)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if j == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
document.warning('UnFunky inset!')
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i = k
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
continue
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
del document.body[j]
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i += 1
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
This is much more complicated than what we had before, but it is much more
|
|
reliable.
|
|
(Probably, much of this logic should be wrapped in a function.)
|
|
\end_layout
|
|
|
|
\begin_layout Subsection
|
|
Comments and Coding Style
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
I've written the previous routine in the style in which most
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
lyx2lyx
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
routines have generally been written: There are no comments, and all variable
|
|
names are completely uninformative.
|
|
For all the usual reasons, this is bad.
|
|
It will take us a bit of effort to change this practice, but it is worth
|
|
doing.
|
|
The people who have to fix
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
lyx2lyx
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
bugs are not always the ones who wrote the code, and even the ones who
|
|
did may not remember what it was supposed to do.
|
|
So let's write something like this:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
def revert_something(document):
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i = 0
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
while True:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i = find_token(document.body, '
|
|
\backslash
|
|
begin_inset Funky', i)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if i == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
break
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
endins = find_end_of_inset(document.body, i)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if endins == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
document.warning('No end to Funky inset!')
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i += 1
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
continue
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
blay = find_token(document.body, '
|
|
\backslash
|
|
|
|
\backslash
|
|
begin_layout', i, endins)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if blay == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
document.warning('No layout! Hope for the best!')
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
blay = endins
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
optline = find_token(document.body, 'newoption', i, blay)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if optline == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
document.warning('UnFunky inset!')
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i = endins
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
continue
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
del document.body[optline]
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i += 1
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
No comments really needed in that one, I suppose.
|
|
\end_layout
|
|
|
|
\begin_layout Subsection
|
|
Magic Numbers
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
Another common error is relying too much on assumptions about the structure
|
|
of a valid LyX file.
|
|
Here is an example.
|
|
Suppose we want to add a
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
|
|
\backslash
|
|
noindent
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
flag to the first paragraph of any Funky inset.
|
|
Then it is tempting to do something like this:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
def add_noindent(document):
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i = 0
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
while True:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i = find_token(document.body, '
|
|
\backslash
|
|
begin_inset Funky', i)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if i == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
break
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
document.body.insert(i+4, '
|
|
\backslash
|
|
|
|
\backslash
|
|
noindent')
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i += 4
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
Experienced programmers will know that this is bad.
|
|
Where does the magic number 4 come from? The answer is that it comes from
|
|
examining the LyX file.
|
|
One looks at a typical file containing a Funky inset and sees:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\backslash
|
|
begin_inset Funky
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
status collapsed
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\backslash
|
|
begin_layout Standard
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
here is some content
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\backslash
|
|
end_layout
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\backslash
|
|
end_inset
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
So
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
|
|
\backslash
|
|
noindent
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
goes four lines after the inset, as we might confirm by adding it in LyX
|
|
and looking at that file.
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
Much of the time, this will work, but there is no guarantee that it will
|
|
be correct, and the same goes for any assumption of this sort.
|
|
It is not enough even to study the LyX source code and make very sure that
|
|
the output routine produces what one thinks it does.
|
|
The problem is that the empty line before
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
|
|
\backslash
|
|
begin_layout
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
could easily disappear, without any change to the semantics.
|
|
Or another line could appear.
|
|
There are several reasons for this.
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
First, looking at the source code of the current version of LyX tells you
|
|
nothing about how the file might have been created by some other version.
|
|
Maybe we get tired of blank lines and decide to remove them.
|
|
This is not going to be accounted for in some reversion routine in
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
lyx2lyx
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
.
|
|
The semantics of the file matters, and LyX's ability to read it matters.
|
|
Blank lines here and there do not matter.
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
Second, LyX files are not always produced by LyX.
|
|
Some of them are produced by external scripts (sed, perl, etc) that people
|
|
write to do search and replace operations that are not possible inside
|
|
LyX (and this will still be true once advanced search and replace is available).
|
|
Such files may end up having slightly different structures than are usual,
|
|
and yet be perfectly good files.
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
Third, and most importantly, the file you are modifying has almost certainly
|
|
been through several other conversion routines before it gets to yours.
|
|
A quick look at some of these routines will make it very clear how difficult
|
|
it is to get all the blank lines in the right places, and people rarely
|
|
check for this: They check to make sure the file opens correctly and that
|
|
its output is right, but who cares how many blank lines there are? Again,
|
|
it is the semantics that matters, not the fine details of file structure.
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
Or consider this possibility: Someone else wrote a routine to remove
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
newoption
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
, but, since they failed to read this document, their routine has all the
|
|
bugs we discussed before.
|
|
As a result,
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
newoption
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
is still there in one of the Funky insets in the document, now that it
|
|
has gotten to your routine.
|
|
So what you actually have is:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\backslash
|
|
begin_inset Funky
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
status collapsed
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
newoption false
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\backslash
|
|
begin_layout Standard
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
here is some content
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\backslash
|
|
end_layout
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\backslash
|
|
end_inset
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
This is not a valid LyX document of the format on which you are operating.
|
|
But surely you do not really want to produce this:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\backslash
|
|
begin_inset Funky
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
status collapsed
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
newoption false
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\backslash
|
|
noindent
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\backslash
|
|
begin_layout Standard
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
here is some content
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\backslash
|
|
end_layout
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\backslash
|
|
end_inset
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
If you do, you will have made matters worse, and also failed to unindent
|
|
the paragraph.
|
|
The file will still open, probably, though with warnings.
|
|
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
But things can (and do) get much worse.
|
|
Suppose you had meant, for some reason, to change the layout, whatever
|
|
it was, to
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
Plain Layout
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
.
|
|
So you do:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
def make_funky_plain(document):
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i = 0
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
while True:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i = find_token(document.body, '
|
|
\backslash
|
|
begin_inset Funky', i)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if i == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
break
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
document.body[i+4] = '
|
|
\backslash
|
|
begin_layout Plain Layout'
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i += 4
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
Now you've produced this:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\backslash
|
|
begin_inset Funky
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
status collapsed
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
newoption false
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\backslash
|
|
begin_layout Plain Layout
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\backslash
|
|
begin_layout Standard
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
here is some content
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\backslash
|
|
end_layout
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
|
|
\backslash
|
|
end_inset
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
LyX will abort the parse when it hits
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
|
|
\backslash
|
|
end_inset
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
, complaining about a missing
|
|
\begin_inset Flex Code
|
|
status collapsed
|
|
|
|
\begin_layout Plain Layout
|
|
|
|
\backslash
|
|
end_layout
|
|
\end_layout
|
|
|
|
\end_inset
|
|
|
|
.
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
The solution is very simple:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
def make_funky_plain(document):
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i = 0
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
while True:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i = find_token(document.body, '
|
|
\backslash
|
|
begin_inset Funky', i)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if i == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
break
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
endins = find_end_of_inset(document.body, i)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if endins == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
...
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
lay = find_token(document.body, '
|
|
\backslash
|
|
begin_layout', i, endins)
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
if lay == -1:
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
...
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
document.body[lay] = '
|
|
\backslash
|
|
begin_layout Plain Layout'
|
|
\end_layout
|
|
|
|
\begin_layout LyX-Code
|
|
i = endins
|
|
\end_layout
|
|
|
|
\begin_layout Standard
|
|
Again, a bit more complex, but reliable.
|
|
\end_layout
|
|
|
|
\end_body
|
|
\end_document
|