73 lines
2.6 KiB
Python
73 lines
2.6 KiB
Python
# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
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# Copyright 2016-2017 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
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#
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# This file is part of qutebrowser.
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#
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# qutebrowser is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# qutebrowser is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with qutebrowser. If not, see <http://www.gnu.org/licenses/>.
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"""Utilities related to javascript interaction."""
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def string_escape(text):
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"""Escape values special to javascript in strings.
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With this we should be able to use something like:
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elem.evaluateJavaScript("this.value='{}'".format(string_escape(...)))
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And all values should work.
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"""
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# This is a list of tuples because order matters, and using OrderedDict
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# makes no sense because we don't actually need dict-like properties.
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replacements = (
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('\\', r'\\'), # First escape all literal \ signs as \\.
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("'", r"\'"), # Then escape ' and " as \' and \".
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('"', r'\"'), # (note it won't hurt when we escape the wrong one).
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('\n', r'\n'), # We also need to escape newlines for some reason.
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('\r', r'\r'),
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('\x00', r'\x00'),
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('\ufeff', r'\ufeff'),
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# http://stackoverflow.com/questions/2965293/
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('\u2028', r'\u2028'),
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('\u2029', r'\u2029'),
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)
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for orig, repl in replacements:
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text = text.replace(orig, repl)
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return text
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def _convert_js_arg(arg):
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"""Convert the given argument so it's the equivalent in JS."""
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if arg is None:
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return 'undefined'
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elif isinstance(arg, str):
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return '"{}"'.format(string_escape(arg))
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elif isinstance(arg, bool):
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return str(arg).lower()
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elif isinstance(arg, (int, float)):
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return str(arg)
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else:
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raise TypeError("Don't know how to handle {!r} of type {}!".format(
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arg, type(arg).__name__))
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def assemble(module, function, *args):
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"""Assemble a javascript file and a function call."""
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js_args = ', '.join(_convert_js_arg(arg) for arg in args)
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if module == 'window':
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parts = ['window', function]
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else:
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parts = ['window', '_qutebrowser', module, function]
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code = '"use strict";\n{}({});'.format('.'.join(parts), js_args)
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return code
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