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#!/usr/bin/env python |
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""" |
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Pandoc filter for changing font size in LaTeX. |
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""" |
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from typing import Any |
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from panflute import ( |
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Code, |
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CodeBlock, |
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Div, |
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Doc, |
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Element, |
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RawBlock, |
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RawInline, |
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Span, |
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debug, |
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run_filter, |
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) |
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def latex_code(size: str) -> str: |
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""" |
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Get LaTeX code for size. |
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Arguments |
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--------- |
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size |
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The size name. |
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Returns |
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------- |
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str |
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LaTeX code for size. |
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""" |
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return "\\" + size + " " |
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def get_correct_size(size: str) -> str: |
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""" |
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Get correct size. |
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Arguments |
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--------- |
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size |
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The size name. |
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Returns |
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------- |
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str |
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The correct size. |
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""" |
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if size in ( |
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"Huge", |
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"huge", |
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"LARGE", |
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"Large", |
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"large", |
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"normalsize", |
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"small", |
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"footnotesize", |
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"scriptsize", |
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"tiny", |
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): |
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return size |
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debug( |
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"[WARNING] pandoc-latex-fontsize: " |
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+ size |
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+ " is not a correct LaTeX size; using normalsize" |
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) |
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return "normalsize" |
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def add_latex(elem: Element, latex: str) -> list[Element] | None: |
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""" |
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Add LaTeX code to elem. |
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Arguments |
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--------- |
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elem |
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A pandoc element |
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latex |
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A LaTeX code |
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Returns |
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------- |
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list[Element] | None |
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A list of pandoc elements or None |
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""" |
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# Is it a Span? |
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if isinstance(elem, Span): |
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elem.content.insert(0, RawInline(latex, "tex")) |
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# Is it a Div? |
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elif isinstance(elem, Div): |
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elem.content.insert(0, RawBlock("{" + latex, "tex")) |
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elem.content.append(RawBlock("}", "tex")) |
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# Is it a Code? |
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elif isinstance(elem, Code): # noqa: R505 |
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return [RawInline("{" + latex, "tex"), elem, RawInline("}", "tex")] |
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# Is it a CodeBlock? |
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elif isinstance(elem, CodeBlock): |
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return [RawBlock("{" + latex, "tex"), elem, RawBlock("}", "tex")] |
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return None |
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def fontsize(elem: Element, doc: Doc) -> list[Element] | None: |
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""" |
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Generate fontsize for elem. |
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Arguments |
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--------- |
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elem |
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A pandoc element |
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doc |
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The pandoc document |
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Returns |
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------- |
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list[Element] | None |
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A list of pandoc elements or None |
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""" |
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# Is it in the right format and is it a Span, Div, Code or CodeBlock? |
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if doc.format in ("latex", "beamer") and elem.tag in ( |
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"Span", |
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"Div", |
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"Code", |
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"CodeBlock", |
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): |
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# Is there a latex-fontsize attribute? |
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if "latex-fontsize" in elem.attributes: |
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return add_latex( |
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elem, latex_code(get_correct_size(elem.attributes["latex-fontsize"])) |
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) |
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# Get the classes |
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classes = set(elem.classes) |
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# Loop on all fontsize definition |
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for definition in doc.defined: |
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# Are the classes correct? |
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if classes >= definition["classes"]: |
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return add_latex(elem, definition["latex"]) |
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return None |
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def prepare(doc: Doc) -> None: |
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""" |
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Prepare the doc. |
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Arguments |
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--------- |
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doc |
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The pandoc document |
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""" |
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# Prepare the definitions |
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doc.defined = [] |
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# Get the meta data |
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meta = doc.get_metadata("pandoc-latex-fontsize") |
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if isinstance(meta, list): |
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# Loop on all definitions |
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for definition in meta: |
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# Verify the definition |
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if ( |
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isinstance(definition, dict) |
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and "classes" in definition |
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and isinstance(definition["classes"], list) |
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): |
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add_definition(doc.defined, definition) |
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def add_definition(defined: list[dict[str, Any]], definition: dict[str, Any]) -> None: |
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""" |
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Add definition to doc. |
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Arguments |
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--------- |
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defined |
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A list of definition |
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definition |
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A new definition |
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""" |
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# Get the classes |
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classes = definition["classes"] |
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# Get the size |
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if "size" in definition: |
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size = get_correct_size(definition["size"]) |
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else: |
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debug("[WARNING] pandoc-latex-fontsize: size is not defined; using normalsize") |
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size = "normalsize" |
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# Add a definition |
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defined.append({"classes": set(classes), "latex": latex_code(size)}) |
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def main(doc: Doc | None = None) -> Doc: |
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""" |
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Convert the pandoc document. |
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Arguments |
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--------- |
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doc |
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The pandoc document. |
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Returns |
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------- |
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Doc |
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The modified document. |
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""" |
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return run_filter(fontsize, prepare=prepare, doc=doc) |
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if __name__ == "__main__": |
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main() |
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