NDOJ/judge/highlight_code.py

from django.utils.html import escape, mark_safe

__all__ = ["highlight_code"]


def _make_pre_code(code):
    return mark_safe("<pre>" + escape(code) + "</pre>")


def _wrap_code(inner):
    yield 0, "<code>"
    for tup in inner:
        yield tup
    yield 0, "</code>"


try:
    import pygments
    import pygments.lexers
    import pygments.formatters.html
    import pygments.util
except ImportError:

    def highlight_code(code, language, cssclass=None):
        return _make_pre_code(code)

else:

    class HtmlCodeFormatter(pygments.formatters.HtmlFormatter):
        def wrap(self, source, outfile):
            return self._wrap_div(self._wrap_pre(_wrap_code(source)))

    def highlight_code(code, language, cssclass="codehilite", linenos=True):
        try:
            lexer = pygments.lexers.get_lexer_by_name(language)
        except pygments.util.ClassNotFound:
            return _make_pre_code(code)

        if linenos:
            return mark_safe(
                pygments.highlight(
                    code, lexer, HtmlCodeFormatter(cssclass=cssclass, linenos="table")
                )
            )
        return mark_safe(
            pygments.highlight(code, lexer, HtmlCodeFormatter(cssclass=cssclass))
        )