pandoc-tex-numbering

This is an all-in-one pandoc filter for converting your LaTeX files to any format while keeping numbering, hyperlinks, caption formats and (clever) cross references in (maybe multi-line) equations, sections, figures, tables, theorems and appendices. The formating is highly customizable, easy-to-use, and even more flexible than the LaTeX default.

What do we support?

Multi-line Equations: Multi-line equations in LaTeX math block such as align, cases can be numbered line by line. \nonumber commands are supported to turn off the numbering of a specific line.
cleveref Package: cref and Cref commands are supported. You can customize the prefix of the references.
Subfigures: subcaption package is supported. Subfigures can be numbered with customized symbols and formats.
Theorems: Theorems are supported with customized formats.
Appendices: Appendices are supported with customized formats.
Non-Arabic Numbers: Various non-arabic numbers are supported, such as Latin letters, Chinese, Roman, Greek, Cyrillic, etc.
Custom List of Figures and Tables: Short captions as well as custom lof/lot titles are supported for figures and tables.
Custom Formatting of Everything: You can customize the format of the numbering and references with python f-string format based on various fields we provide.

Installation

First, install pandoc and python3 if you haven't. Then you can install the filter via one of the following methods:

From PyPI (Recommended)

In Python>=3.8 pandoc-tex-numbering can be installed via pip:

pip install pandoc-tex-numbering

From Source

Only in case you want to use the filter with a lower version of Python (under 3.8), you can download the source code (i.e. all files under src/pandoc_tex_numbering) manually and put it in the same directory as your source file. In this case, when using the filter, you should specify the filter file via -F pandoc-tex-numbering.py instead of -F pandoc-tex-numbering.

Quick Start

Take .docx as an example:

pandoc -F pandoc-tex-numbering -o output.docx input.tex

Customization

You can set the following variables in the metadata of your LaTeX file to customize the behavior of the filter:

General

number-figures: Whether to number the figures. Default is true.
number-tables: Whether to number the tables. Default is true.
number-equations: Whether to number the equations. Default is true.
number-sections: Whether to number the sections. Default is true.
number-theorems: Whether to number the theorems. Default is true. You MUST set the metadata theorem-names to the names of the theorems you defined in the LaTeX source code to make it work.
number-reset-level: The level of the section that will reset the numbering. Default is 1. For example, if the value is 2, the numbering will be reset at every second-level section and shown as "1.1.1", "3.2.1" etc.
section-max-levels: The maximum level of the section numbering. Default is 10.
data-export-path: Where to export the filter data. Default is None, which means no data will be exported. If set, the data will be exported to the specified path in the JSON format. This is useful for further usage of the filter data in other scripts or filter-debugging.
auto-labelling: Whether to automatically add identifiers (labels) to figures and tables without labels. Default is true. This has no effect on the output appearance but can be useful for cross-referencing in the future (for example, in the .docx output this will ensure that all your figures and tables have a unique auto-generated bookmark).

Numbering System

{item_type}-numstyle: The style of the numbering of figures, tables, equations, sections, theorems, subfigures. For example figure-numstyle represents the style of the numbering of figures.
{item_type}-numstyle-{i}: The style of the i-th level of the numbering of sections or appendices. For example, section-numstyle-1 represents the style of the first level of the numbering of sections.

Possible values are:

arabic: Arabic numbers (1, 2, 3, ...)
roman: Lowercase Roman numbers (i, ii, iii, ...)
Roman: Uppercase Roman numbers (I, II, III, ...)
latin: Lowercase Latin numbers (a, b, c, ...)
Latin: Uppercase Latin numbers (A, B, C, ...)
greek: Lowercase Greek numbers (α, β, γ, ...)
Greek: Uppercase Greek numbers (Α, Β, Γ, ...)
cyrillic: Lowercase Cyrillic numbers (а, б, в, ...)
Cyrillic: Uppercase Cyrillic numbers (А, Б, В, ...)
zh: Chinese numbers (一, 二, 三, ...)

Default values of most of the items are arabic. Exceptions are:

Default value of subfigure-numstyle is latin.
Default value of appendix-numstyle-1 is Latin.

Formatting System

We support a very flexible formatting system for the numbering and references. There are two different formatting systems for the numbering and references. You can use them together. The two systems are:

Prefix-based System: This is lightweight and easy to use. When referenced, a corresponding prefix will automatically added to the number.
Custom Formatting System: This is more flexible and powerful. You can customize the format of the numbering and references with python f-string format based on various fields we provide.

Prefix-based System

The following metadata are used for the prefix-based system:

figure-prefix: The prefix of the figure reference. Default is "Figure".
table-prefix: The prefix of the table reference. Default is "Table".
equation-prefix: The prefix of the equation reference. Default is "Equation".
section-prefix: The prefix of the section reference. Default is "Section".
theorem-{theorem_name}-prefix: The prefix of the theorem reference. Default is capitalized theorem_name. For example, if you defined \newtheorem{thm}{Theorem}, you should set the metadata theorem-thm-prefix to "Theorem" (and the default is Thm).
prefix-space: Whether to add a space between the prefix and the number. Default is true (for some languages, the space may not be needed).

Custom Formatting System (f-string formatting)

Metadata Names

For now, we support 5+x types of items and 4 types of formatting:

Item types: fig (figure), tab (table), eq (equation), sec (section), subfig (subfigure), thm-{theorem_name} (theorem). For example, if you defined \newtheorem{lem}{Lemma}, the item type is thm-lem.
Formatting types:
- src (source): The format of the numbering where the item appears. For figures and tables, this is the format used in the captions. For equations, this is the format used after the equations. For sections, this is the format used at the beginning of the section titles.
- ref (reference): The format of numbering used in \ref command.
- cref (cleveref reference)/Cref (Cleveref reference with capital letter): The format of numbering used in \cref and \Cref commands.

You can customize the formatting type b of the item type a by setting the metadata a-b-format. For example, to customize the numbering format of figure captions, you set the fig-src-format metadata.

By default, if not specified, the Cref format will be the capitalized version of the cref format, the src format will be the same as the Cref format, the ref format will be "{num}", and the cref format will be "{prefix}{num}".

For sections, every level has its own formatting. You can set the metadata, for example, section-src-format-1, section-cref-format-2, etc.

For equations, the default src format (i.e. equation-src-format) is "\\qquad({num})". \qquad is used to offer a little space between the equation and the number. You can customize it as you like.

Metadata Values

The metadata values are python f-string format strings. Various fields are provided for you to customize the format. For example, if you have the following settings:

number-reset-level: 2
figure-prefix:"figure"
prefix-space to True.
section-numstyle-1: "Roman"
figure-numstyle: "latin"

Then, the fifth figure under subsection 2.3 will have the following fields:

num: II.3.e
parent_num: II.3
this_num: e (note that the fields ended with _num will keep the numbering style settings)
fig_id: 5
prefix: figure (note the space at the end)
Prefix: Figure
h1: 2
h2: 3（note that h2 is accessible only when the number-reset-level >= 2 and so on）
h1_zh: 二
h1_roman: ii
h1_Roman: II
h1_latin: b
h1_Latin: B
... (any supported languages or symbols, see the Numbering System section)

Here are some examples of the metadata values:

set the fig-src-format metadata to "{prefix}{num}", the numbering before its caption will be shown as "Figure 2.3.5"
set the fig-cref-format metadata to "{Prefix} {fig_id} (in Section {parent_num})", when referred to by \Cref, it will be shown as "Figure 5 (in Section 2.3)".
set the section-src-format-1 metadata to "第{h1_zh}章" and section-cref-format-1 to "第{h1_zh}章" to use Chinese numbers for the first level sections.
set the thm-thm-cref-format metadata to "Theorem {thm-thm_id}" to use the format "Theorem 1" for the theorem environment "thm" while "Theorem {num}" for "Theorem 1.1".

For more non-arabic number support, see the Custom Non-Arabic Numbers Support section.

For more examples, see also the Customized Metadata Examples.

Equations

multiline-environments: Possible multiline environment names separated by commas. Default is "cases,align,aligned,gather,multline,flalign". The equations under these environments will be numbered line by line.

Theorems

theorem-names: The names of the theorems separated by commas. Default is "". For example, if you have \newtheorem{thm}{Theorem} and \newtheorem{lem}{Lemma}, you should set the metadata theorem-names to "thm,lem".

List of Figures and Tables

To support short captions and custom titles in the list of figures and tables, you can set the following metadata to turn on the custom list of figures and tables:

custom-lof: Whether to use a custom list of figures. Default is false.
custom-lot: Whether to use a custom list of tables. Default is false.

You can customize the list of figures and tables by setting the following metadata:

lof-title: The title of the list of figures. Default is "List of Figures".
lot-title: The title of the list of tables. Default is "List of Tables".
list-leader-type: The type of leader used in the list of figures and tables (placeholders between the caption and the page number). Default is "dots". Possible values are "dot", "hyphen", "underscore", "middleDot" and "none".

For more details, see the List of Figures and Tables section.

Multiple References

multiple-ref-suppress: Whether to suppress the multiple references. Default is true. If set to true, the multiple references will be suppressed. For example, if you have \cref{eq1,eq2,eq3,eq4}, it will be shown as "equations 1-4" instead of "equations 1, 2, 3 and 4".
multiple-ref-separator: The separator between the multiple references. Default is ", ". For example, if you set it to "; ", the multiple references will be shown as "equations 1; 2; 3 and 4".
multiple-ref-last-separator: The separator between the last two references. Default is " and ". For example, if you set it to " & ", the multiple references will be shown as "equations 1, 2, 3 & 4".
multiple-ref-to: The separator between suppressed multiple references. Default is "-". For example, if you set it to " to ", the multiple references will be shown as "equations 1 to 4".

NOTE: in case of setting metadata in a yaml file, the spaces at the beginning and the end of the values are by default stripped. Therefore, if you want to keep the spaces in the yaml metadata file, you should mannually escape those spaces via double slashes. For example, if you want set multiple-ref-last-separator to " and " (spaces appear at the beginning and the end), you should set it as "\\ and\\ " in the yaml file. See pandoc's issue #10539 for more further discussions.

Appendix

appendix-names: The names of the appendices separated by "/,". If you have this in your tex file:
```
  \appendix
  \chapter{First Appendix}
  \chapter{Second Appendix}
```
You should set the metadata appendix-names to "First Appendix/,Second Appendix". Note that the names should be separated by "/,", not by "," (so as to avoid conflicts with the commas in the names).

Details

Equations

If metadata number-equations is set to true, all the equations will be numbered. The numbers are added at the end of the equations and the references to the equations are replaced by their numbers.

Equations under multiline environments (specified by metadata multiline-environments ) such as align, cases etc. are numbered line by line, and the others are numbered as a whole block.

That is to say, if you want the filter to number multiline equations line by line, use align, cases etc. environments directly. If you want the filter to number the whole block as a whole, use split, aligned etc. environments in the equation environment. In multiline environments, \nonumber commands are supported to turn off the numbering of a specific line.

For example, as shown in test_data/test.tex:

\begin{equation}
    \begin{aligned}
        f(x) &= x^2 + 2x + 1 \\
        g(x) &= \sin(x)
    \end{aligned}
    \label{eq:quadratic}
\end{equation}

This equation will be numbered as a whole block, say, (1.1), while:

\begin{align}
    a &= b + c \label{eq:align1} \\
    d &= e - f \label{eq:align2} \\
    g &= h \nonumber \\
    i &= j + k \label{eq:align3}
\end{align}

This equation will be numbered line by line, say, (1.2), (1.3) and (1.4), while the third line will not be numbered.

NOTE: the pandoc filters have no access to the difference of align and align* environments. Therefore, you CANNOT turn off the numbering of a specific align environment via the * mark. If you do want to turn off the numbering of a specific align environment, a temporary solution is to manually add \nonumber commands to every line of the environment. This may be fixed by a custom lua reader to keep those information in the future.

List of Figures and Tables

Currently, this feature is only available for docx output with Python>=3.8.

If you set the metadata custom-lof and custom-lot to true, the filter will generate a custom list of figures and tables.

The captions used in the list of figures and tables are the short captions if they are defined in the LaTeX source code. If not, the full captions are used. The short captions are defined in the LaTeX source code as \caption[short caption]{full caption}.

The list of figures and tables will be put at the beginning of the document by default. If you want to put the lists at posistions where the \listoffigures and \listoftables commands are found in the LaTeX source code, you should pass -f latex+raw_tex to the pandoc command. However, currently, -f latex+raw_tex does NOT work if you're using subfiles package..

Data Export

If you set the metadata data-export-path to a path, the filter will export the filter data to the specified path in the JSON format. This is useful for further usage of the filter data in other scripts or filter debugging. The output data is a dictionary with identifiers (labels) as keys and the corresponding data as values. The info dict contains the following keys: nums: list[int], item_type: Literal["fig", "tab", "eq", "sec", "subfig"], caption: Optional[str], short_caption: Optional[str], src: str, ref: str, cref: str, Cref: str.

Log

Some warning message will be shown in the log file named pandoc-tex-numbering.log in the same directory as the output file. You can check this file if you encounter any problems or report those messages in the issues.

`org` file support

org files are supported by adding an additional lua filter src\org_helper.lua to the pandoc command. The usage is as follows:

pandoc --lua-filter org_helper.lua --filter pandoc-tex-numbering input.org -o output.docx

Be sure to use --lua-filter org_helper.lua before --filter pandoc-tex-numbering.

Reason for this is the default org reader of pandoc does not parse LaTeX codes by default, for example, LaTeX equations in equation environments and cross references via \ref{} macros are parsed as RawBlock and RawInline nodes, while we desire Math nodes and Link nodes respectively. The org_helper.lua filter helps read these blocks via latex reader and after that, the pandoc-tex-numbering filter can work as expected.

Related discussions can also be found in pandoc issue #1764 (codes in org_helper.lua are based on comments from @tarleb in this issue) and pandoc-tex-numbering issue #1.

Examples

With the testing file tests/test.tex:

Default Metadata

pandoc test.tex -o output.docx -F pandoc-tex-numbering -M theorem-names="thm,lem" -M appendix-names="Appendix"

The results are shown as follows:

$alt text$ $alt text$ $alt text$

Customized Metadata

In the following example, we custom the following silly items only for the purpose of demonstration:

Reset the numbering at the second level sections, such that the numbering will be shown as "1.1.1", "3.2.1" etc.
The formattings are set as follows:
- For sections:
  - at the beginning of sections, use Chinese numbers "第一章" for the first level sections and English numbers "Section 1.1" for the second level sections.
  - when referred to, use, in turn, "Chapter 1", "第1.1节" etc.
- For tables:
  - at the beginning of captions, use styles like Table 1-1-1
  - when referred to, use styles like table 1 (in Section 1.1)
- For figures:
  - at the beginning of captions, use styles like Figure 1.1:1
  - when referred to, use styles like as shown in Fig. 1.1.1,
- For equations, suppress the parentheses and use the format 1.1.1
- For subfigures:
  - use greek letters for symbols
  - at the beginning of captions, use styles like [β(1)]
- For theorems:
  - Theorem environment "thm" uses "Theorem" as the prefix
  - Lemma environment "lem" uses "Lemma" as the prefix
- For appendices:
  - Suppress the top level appendix number
  - Use (upper case) Roman numbers for the second level appendices
  - Suppress the top level numbering in all references
Turn on custom list of figures and tables and:
- Use custom titles as "图片目录" and "Table Lists" respectively.
- Use hyphens as the leader in the lists.
For multiple references:
- Stop suppressing the multiple references.
- Use "、" as the separator between the multiple references.
- Use " & "(spaces at both ends) as the last separator between the last two references.
Export the filter data to a file named data.json.

Run the following command with corresponding metadata in a metadata.yaml file (recommended):

pandoc -o output.docx -F pandoc-tex-numbering --metadata-file test.yaml -f latex+raw_tex test.tex

# test.yaml
number-reset-level: 2
theorem-names: "thm,lem"
appendix-names: "Appendix"

# Prefix Settings
figure-prefix: Fig
table-prefix: Tab
equation-prefix: Eq
theorem-thm-prefix: Theorem
theorem-lem-prefix: Lemma

# Numbering Style Settings
subfigure-numstyle: "greek"
appendix-numstyle-2: "Roman"

# Formatting Settings
section-src-format-1: "第{h1_zh}章"
section-src-format-2: "Section {num}."
section-cref-format-1: "chapter {h1}"
section-cref-format-2: "第{num}节"
table-src-format: "Table {h1}-{h2}-{this_num}"
table-cref-format: "table {this_num} (in Section {parent_num})"
figure-src-format: "Figure {parent_num}:{this_num}"
figure-cref-format: "as shown in Fig. {num}"
equation-src-format: "\\qquad {num}"
subfigure-src-format: "[{this_num}({subfig_id})]"
appendix-src-format-1: "" # Suppress the top level appendix number
appendix-ref-format-2: "{this_num}"
appendix-src-format-2: "Appendix {this_num}"

# List of Figures and List of Tables Settings
custom-lot: true
custom-lof: true
lot-title: "Table List"
lof-title: "图片目录"
list-leader-type: "hyphen"
data-export-path: "data.json"

# Multiple Reference Settings
multiple-ref-suppress: false
multiple-ref-separator: "、"
multiple-ref-last-separator: "\\ &\\ "
multiple-ref-to: "\\ to\\ "

The results are shown as follows: $alt text$ $alt text$ $alt text$

Development

Basic Structure of the Filter

If you want to extend the filter or understand the core logic of the filter, before and while reading the source code, you may want to read this.

pandoc-tex-numbering is designed with an OOP style to support a flexible and extensible formatting system. The core objects are as follows:

Formater objects: represents a specific formatting logic. It defines all possible formats of a specific type of item.
- Data: a series of format presets (a dict mapping format names to a fstring or a callable)
- Usage: call with a detailed nums list to generate the formatted string.
Numbering objects: represents a specific numbering identity, i.e. an unique item which can be referred to.
- Data: numbering information of the item (a nums list per se), its corresponding formater object and other metadata (e.g. captions).
- Usage:
  - Generate formatted string: built-in format presets (ref, cref, Cref, src) of this item can be accessed directly by calling the corresponding property of the numbering object (e.g. num_obj.ref).
  - Compare: two numbering objects can be directly compared based on the nums list.
NumberingState object: core object to manage the numbering of all items in the document. It mangages numbering increment, reset, generate new Numberintg objects and assign proper Formater objects to them.
- Data: current numbering information of all types of items, and formater objects for all types of items.
- Usage:
  - Increment numbering: call next_{item_type} method to increment the numbering of a specific type of item (numbering reset will be handled automatically).
  - Get current (newest) numbering objects of a specific type: call current_{item_type} method to get the current numbering object of a specific type.

The core logic of the pandoc-tex-numbering filter can be roughly illustrated as follows:

Prepare the global settings and variables (prepare function).
Construct the Formater objects for various types of items: figures, tables, equations, sections, theorems, etc. (prepare function).
Initialize a core NumberingState object (doc.num_state) with the Formater objects (prepare function).
Walk through the document to construct the reference dictionary (doc.ref_dict) (a series of find_label_{item_type} functions):
- Call next_{item_type} method of the NumberingState object to increment the numbering of a specific type of item.
- Save the Numbering object to the reference dictionary (doc.ref_dict) with the label as the key.
- Modify some inplace numbering elements with num.src (e.g. add numbering to the caption of a figure, add numbering to the math block).
Walk through the document again to replace all references with the formatted strings (mainly labels2refs function).
Finalize the document (finalize function):
- Wrap the math blocks and some tables with div elements to add identifiers.
- Export the reference dictionary to a json file if needed.
- Clean up the global variables.

Custom Non-Arabic Numbers Support

Currently, the filter supports only Chinese non-arabic numbers. If you want to support other languages, you can modify the lang_num.py file. For example, if you want to support the non-arabic numbers in the language foo, you can:

Define a new function arabic2foo(num:int)->str that converts the arabic number to the corresponding non-arabic number.
Add the function to the language_functions dictionary with the corresponding language name as the key, for example {"foo":arabic2foo}.

Then you can set the metadata section-format-1="Chapter {h1_foo}." to enable the non-arabic numbers in the filter.

Advanced docx Support

In oxml.py, I added a built-in framework to support high-level OOXML operations. If you're familiar with OOXML, you can utilize this framework to embed OOXML codes directly into the output (into RawBlock nodes with openxml format).

FAQ

Q: Can the filter work with xxx package?
A: It depends. If the package is supported by pandoc, then it should work. If not, you may need to a custom filter or reader to parse the LaTeX codes correctly. In the latter case, this is out of the scope of this filter. For example, the macro \ce in the mhchem package is not supported by pandoc, so we cannot parse the chemical equations correctly.
Q: Can the filter support complex caption macros such as \bicaption?
A: No for now. Caption macros such as \bicaption are not supported by the default latex reader of pandoc. Therefore, we cannot parse them correctly. You may need a custom reader to parse them correctly or modify the source code before using this filter.
Q: Can docx output support the short captions in the list of figures and tables?
A: Now supported.

That said, however, functionalities mentioned above can never be supported easily since they are not, and maybe never will be, supported by native pandoc framework.

TODO

There are some known issues and possible improvements:

Support multiple references in cleveref package.
Add empty caption for figures and tables without captions (currently, they have no caption and therefore links to them cannot be located).
Directly support align* and other non-numbered environments.
Subfigure support.
Support short captions in docx output.
Support right-aligned equation numbers.
A separate documentation page.
Testing scripts.
How-tos.

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src		src
tests		tests
.gitignore		.gitignore
CHANGELOG.md		CHANGELOG.md
LICENSE		LICENSE
README.md		README.md
pyproject.toml		pyproject.toml

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pandoc-tex-numbering

Contents

What do we support?

Installation

From PyPI (Recommended)

From Source

Quick Start

Customization

General

Numbering System

Formatting System

Prefix-based System

Custom Formatting System (f-string formatting)

Metadata Names

Metadata Values

Equations

Theorems

List of Figures and Tables

Multiple References

Appendix

Details

Equations

List of Figures and Tables

Data Export

Log

org file support

Examples

Default Metadata

Customized Metadata

Development

Basic Structure of the Filter

Custom Non-Arabic Numbers Support

Advanced docx Support

FAQ

TODO

About

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`org` file support

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