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writer.py
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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')