def set_pattern()

in python/moz/l10n/formats/xliff/serialize.py [0:0]

• 43 lines of code
• 15 McCabe index (conditional complexity)

def set_pattern(el: etree._Element, pattern: Pattern) -> None:
    parent = el
    prev = None

    def add_text(text: str) -> None:
        if prev is None:
            parent.text = (parent.text or "") + text
        else:
            prev.tail = (prev.tail or "") + text

    for part in pattern:
        if isinstance(part, str):
            add_text(part)
        elif isinstance(part, Markup):
            name = clark_name(el.nsmap, part.name)
            if part.kind == "close":
                if part.options:
                    raise ValueError(
                        f"Options on closing markup are not supported: {part}"
                    )
                if parent.tag != name or parent == el:
                    raise ValueError(f"Improper element nesting for {part} in {parent}")
                node = parent
                parent = cast(etree._Element, parent.getparent())
            else:
                attrib = {}
                for key, value in part.options.items():
                    if isinstance(value, VariableRef):
                        raise ValueError(
                            f"Unsupported markup with variable option: {part}"
                        )
                    attrib[clark_name(el.nsmap, key)] = value
                node = etree.SubElement(parent, name, attrib)
                if part.kind == "standalone":
                    prev = node
                else:  # 'open'
                    parent = node
                    prev = None
        else:
            assert isinstance(part, Expression)
            part_source = part.attributes.get("source", None)
            if isinstance(part_source, str):
                add_text(part_source)
            else:
                raise ValueError(f"Unsupported expression: {part}")