def parse_printf_pattern()

in python/moz/l10n/util/printf.py [0:0]

• 32 lines of code
• 12 McCabe index (conditional complexity)

def parse_printf_pattern(src: str | None) -> Iterator[str | Expression]:
    if not src:
        return
    pos = 0
    for m in printf.finditer(src):
        start = m.start()
        if start > pos:
            yield src[pos:start]
        source = m[0]
        [argnum, argname, datetime, type] = m.groups()
        pos = m.end()

        if type == "%":
            yield Expression("%", attributes={"source": source})
            continue

        func: str | None
        # TODO post-py38: should be a match
        if datetime:
            func = "datetime"
        elif type in {"c", "C", "s", "S"}:
            func = "string"
        elif type in {"d", "D", "o", "O", "p", "u", "U", "x", "X"}:
            func = "integer"
        elif type in {"a", "A", "e", "E", "f", "F", "g", "G"}:
            func = "number"
        else:
            func = "printf"
        yield Expression(
            VariableRef(argname or ("arg" + (argnum or ""))),
            func,
            attributes={"source": source},
        )
    if pos < len(src):
        yield src[pos:]