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File Content: `jslexer.py`

"""
    babel.messages.jslexer
    ~~~~~~~~~~~~~~~~~~~~~~

    A simple JavaScript 1.5 lexer which is used for the JavaScript
    extractor.

    :copyright: (c) 2013-2023 by the Babel Team.
    :license: BSD, see LICENSE for more details.
"""
from __future__ import annotations

import re
from collections.abc import Generator
from typing import NamedTuple

operators: list[str] = sorted([
    '+', '-', '*', '%', '!=', '==', '<', '>', '<=', '>=', '=',
    '+=', '-=', '*=', '%=', '<<', '>>', '>>>', '<<=', '>>=',
    '>>>=', '&', '&=', '|', '|=', '&&', '||', '^', '^=', '(', ')',
    '[', ']', '{', '}', '!', '--', '++', '~', ',', ';', '.', ':'
], key=len, reverse=True)

escapes: dict[str, str] = {'b': '\b', 'f': '\f', 'n': '\n', 'r': '\r', 't': '\t'}

name_re = re.compile(r'[\w$_][\w\d$_]*', re.UNICODE)
dotted_name_re = re.compile(r'[\w$_][\w\d$_.]*[\w\d$_.]', re.UNICODE)
division_re = re.compile(r'/=?')
regex_re = re.compile(r'/(?:[^/\\]*(?:\\.[^/\\]*)*)/[a-zA-Z]*', re.DOTALL)
line_re = re.compile(r'(\r\n|\n|\r)')
line_join_re = re.compile(r'\\' + line_re.pattern)
uni_escape_re = re.compile(r'[a-fA-F0-9]{1,4}')
hex_escape_re = re.compile(r'[a-fA-F0-9]{1,2}')


class Token(NamedTuple):
    type: str
    value: str
    lineno: int


_rules: list[tuple[str | None, re.Pattern[str]]] = [
    (None, re.compile(r'\s+', re.UNICODE)),
    (None, re.compile(r'<!--.*')),
    ('linecomment', re.compile(r'//.*')),
    ('multilinecomment', re.compile(r'/\*.*?\*/', re.UNICODE | re.DOTALL)),
    ('dotted_name', dotted_name_re),
    ('name', name_re),
    ('number', re.compile(r'''(
        (?:0|[1-9]\d*)
        (\.\d+)?
        ([eE][-+]?\d+)? |
        (0x[a-fA-F0-9]+)
    )''', re.VERBOSE)),
    ('jsx_tag', re.compile(r'(?:</?[^>\s]+|/>)', re.I)),  # May be mangled in `get_rules`
    ('operator', re.compile(r'(%s)' % '|'.join(map(re.escape, operators)))),
    ('template_string', re.compile(r'''`(?:[^`\\]*(?:\\.[^`\\]*)*)`''', re.UNICODE)),
    ('string', re.compile(r'''(
        '(?:[^'\\]*(?:\\.[^'\\]*)*)'  |
        "(?:[^"\\]*(?:\\.[^"\\]*)*)"
    )''', re.VERBOSE | re.DOTALL))
]


def get_rules(jsx: bool, dotted: bool, template_string: bool) -> list[tuple[str | None, re.Pattern[str]]]:
    """
    Get a tokenization rule list given the passed syntax options.

    Internal to this module.
    """
    rules = []
    for token_type, rule in _rules:
        if not jsx and token_type and 'jsx' in token_type:
            continue
        if not template_string and token_type == 'template_string':
            continue
        if token_type == 'dotted_name':
            if not dotted:
                continue
            token_type = 'name'
        rules.append((token_type, rule))
    return rules


def indicates_division(token: Token) -> bool:
    """A helper function that helps the tokenizer to decide if the current
    token may be followed by a division operator.
    """
    if token.type == 'operator':
        return token.value in (')', ']', '}', '++', '--')
    return token.type in ('name', 'number', 'string', 'regexp')


def unquote_string(string: str) -> str:
    """Unquote a string with JavaScript rules.  The string has to start with
    string delimiters (``'``, ``"`` or the back-tick/grave accent (for template strings).)
    """
    assert string and string[0] == string[-1] and string[0] in '"\'`', \
        'string provided is not properly delimited'
    string = line_join_re.sub('\\1', string[1:-1])
    result = []
    add = result.append
    pos = 0

    while True:
        # scan for the next escape
        escape_pos = string.find('\\', pos)
        if escape_pos < 0:
            break
        add(string[pos:escape_pos])

        # check which character is escaped
        next_char = string[escape_pos + 1]
        if next_char in escapes:
            add(escapes[next_char])

        # unicode escapes.  trie to consume up to four characters of
        # hexadecimal characters and try to interpret them as unicode
        # character point.  If there is no such character point, put
        # all the consumed characters into the string.
        elif next_char in 'uU':
            escaped = uni_escape_re.match(string, escape_pos + 2)
            if escaped is not None:
                escaped_value = escaped.group()
                if len(escaped_value) == 4:
                    try:
                        add(chr(int(escaped_value, 16)))
                    except ValueError:
                        pass
                    else:
                        pos = escape_pos + 6
                        continue
                add(next_char + escaped_value)
                pos = escaped.end()
                continue
            else:
                add(next_char)

        # hex escapes. conversion from 2-digits hex to char is infallible
        elif next_char in 'xX':
            escaped = hex_escape_re.match(string, escape_pos + 2)
            if escaped is not None:
                escaped_value = escaped.group()
                add(chr(int(escaped_value, 16)))
                pos = escape_pos + 2 + len(escaped_value)
                continue
            else:
                add(next_char)

        # bogus escape.  Just remove the backslash.
        else:
            add(next_char)
        pos = escape_pos + 2

    if pos < len(string):
        add(string[pos:])

    return ''.join(result)


def tokenize(source: str, jsx: bool = True, dotted: bool = True, template_string: bool = True, lineno: int = 1) -> Generator[Token, None, None]:
    """
    Tokenize JavaScript/JSX source.  Returns a generator of tokens.

    :param jsx: Enable (limited) JSX parsing.
    :param dotted: Read dotted names as single name token.
    :param template_string: Support ES6 template strings
    :param lineno: starting line number (optional)
    """
    may_divide = False
    pos = 0
    end = len(source)
    rules = get_rules(jsx=jsx, dotted=dotted, template_string=template_string)

    while pos < end:
        # handle regular rules first
        for token_type, rule in rules:  # noqa: B007
            match = rule.match(source, pos)
            if match is not None:
                break
        # if we don't have a match we don't give up yet, but check for
        # division operators or regular expression literals, based on
        # the status of `may_divide` which is determined by the last
        # processed non-whitespace token using `indicates_division`.
        else:
            if may_divide:
                match = division_re.match(source, pos)
                token_type = 'operator'
            else:
                match = regex_re.match(source, pos)
                token_type = 'regexp'
            if match is None:
                # woops. invalid syntax. jump one char ahead and try again.
                pos += 1
                continue

        token_value = match.group()
        if token_type is not None:
            token = Token(token_type, token_value, lineno)
            may_divide = indicates_division(token)
            yield token
        lineno += len(line_re.findall(token_value))
        pos = match.end()
Name	Size	Permission
__pycache__	---	0755
__init__.py	349 bytes	0644
catalog.py	36104 bytes	0644
checkers.py	6436 bytes	0644
extract.py	32360 bytes	0644
frontend.py	41999 bytes	0644
jslexer.py	7140 bytes	0644
mofile.py	7345 bytes	0644
plurals.py	7311 bytes	0644
pofile.py	22323 bytes	0644
File Content: jslexer.py

File Content: `jslexer.py`
