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# SPDX-FileCopyrightText: Florian Bruhin (The Compiler) <mail@qutebrowser.org>
#
# SPDX-License-Identifier: GPL-3.0-or-later
"""Utilities related to javascript interaction."""
from typing import Sequence, Union
_InnerJsArgType = Union[None, str, bool, int, float]
_JsArgType = Union[_InnerJsArgType, Sequence[_InnerJsArgType]]
def string_escape(text: str) -> str:
"""Escape values special to javascript in strings.
With this we should be able to use something like:
elem.evaluateJavaScript("this.value='{}'".format(string_escape(...)))
And all values should work.
"""
# This is a list of tuples because order matters, and using OrderedDict
# makes no sense because we don't actually need dict-like properties.
replacements = (
('\\', r'\\'), # First escape all literal \ signs as \\.
("'", r"\'"), # Then escape ' and " as \' and \".
('"', r'\"'), # (note it won't hurt when we escape the wrong one).
('\n', r'\n'), # We also need to escape newlines for some reason.
('\r', r'\r'),
('\x00', r'\x00'),
('\ufeff', r'\ufeff'),
# https://stackoverflow.com/questions/2965293/
('\u2028', r'\u2028'),
('\u2029', r'\u2029'),
)
for orig, repl in replacements:
text = text.replace(orig, repl)
return text
def to_js(arg: _JsArgType) -> str:
"""Convert the given argument so it's the equivalent in JS."""
if arg is None:
return 'undefined'
elif isinstance(arg, str):
return '"{}"'.format(string_escape(arg))
elif isinstance(arg, bool):
return str(arg).lower()
elif isinstance(arg, (int, float)):
return str(arg)
elif isinstance(arg, list):
return '[{}]'.format(', '.join(to_js(e) for e in arg))
else:
raise TypeError("Don't know how to handle {!r} of type {}!".format(
arg, type(arg).__name__))
def assemble(module: str, function: str, *args: _JsArgType) -> str:
"""Assemble a javascript file and a function call."""
js_args = ', '.join(to_js(arg) for arg in args)
if module == 'window':
parts = ['window', function]
else:
parts = ['window', '_qutebrowser', module, function]
code = '"use strict";\n{}({});'.format('.'.join(parts), js_args)
return code
def wrap_global(name: str, *sources: str) -> str:
"""Wrap a script using window._qutebrowser."""
from qutebrowser.utils import jinja # circular import
template = jinja.js_environment.get_template('global_wrapper.js')
return template.render(code='\n'.join(sources), name=name)
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