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name : writer.py
 from __future__ import unicode_literals
import io, datetime, math, string, sys

from .utils import format_rfc3339

try:
    from pathlib import PurePath as _path_types
except ImportError:
    _path_types = ()


if sys.version_info[0] == 3:
    long = int
    unicode = str


def dumps(obj, sort_keys=False):
    fout = io.StringIO()
    dump(obj, fout, sort_keys=sort_keys)
    return fout.getvalue()


_escapes = {'\n': 'n', '\r': 'r', '\\': '\\', '\t': 't', '\b': 'b', '\f': 'f', '"': '"'}


def _escape_string(s):
    res = []
    start = 0

    def flush():
        if start != i:
            res.append(s[start:i])
        return i + 1

    i = 0
    while i < len(s):
        c = s[i]
        if c in '"\\\n\r\t\b\f':
            start = flush()
            res.append('\\' + _escapes[c])
        elif ord(c) < 0x20:
            start = flush()
            res.append('\\u%04x' % ord(c))
        i += 1

    flush()
    return '"' + ''.join(res) + '"'


_key_chars = string.digits + string.ascii_letters + '-_'
def _escape_id(s):
    if any(c not in _key_chars for c in s):
        return _escape_string(s)
    return s


def _format_value(v):
    if isinstance(v, bool):
        return 'true' if v else 'false'
    if isinstance(v, int) or isinstance(v, long):
        return unicode(v)
    if isinstance(v, float):
        if math.isnan(v) or math.isinf(v):
            raise ValueError("{0} is not a valid TOML value".format(v))
        else:
            return repr(v)
    elif isinstance(v, unicode) or isinstance(v, bytes):
        return _escape_string(v)
    elif isinstance(v, datetime.datetime):
        return format_rfc3339(v)
    elif isinstance(v, list):
        return '[{0}]'.format(', '.join(_format_value(obj) for obj in v))
    elif isinstance(v, dict):
        return '{{{0}}}'.format(', '.join('{} = {}'.format(_escape_id(k), _format_value(obj)) for k, obj in v.items()))
    elif isinstance(v, _path_types):
        return _escape_string(str(v))
    else:
        raise RuntimeError(v)


def dump(obj, fout, sort_keys=False):
    tables = [((), obj, False)]

    while tables:
        name, table, is_array = tables.pop()
        if name:
            section_name = '.'.join(_escape_id(c) for c in name)
            if is_array:
                fout.write('[[{0}]]\n'.format(section_name))
            else:
                fout.write('[{0}]\n'.format(section_name))

        table_keys = sorted(table.keys()) if sort_keys else table.keys()
        new_tables = []
        has_kv = False
        for k in table_keys:
            v = table[k]
            if isinstance(v, dict):
                new_tables.append((name + (k,), v, False))
            elif isinstance(v, list) and v and all(isinstance(o, dict) for o in v):
                new_tables.extend((name + (k,), d, True) for d in v)
            elif v is None:
                # based on mojombo's comment: https://github.com/toml-lang/toml/issues/146#issuecomment-25019344
                fout.write(
                    '#{} = null  # To use: uncomment and replace null with value\n'.format(_escape_id(k)))
                has_kv = True
            else:
                fout.write('{0} = {1}\n'.format(_escape_id(k), _format_value(v)))
                has_kv = True

        tables.extend(reversed(new_tables))

        if (name or has_kv) and tables:
            fout.write('\n')
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