def dump(self, headers, data, file):
encoder = JSONEncoder(**self.serializer_parameters)
# JSON pieces
indent = encoder.indent
newline = '\n'
newline_indent = '' if indent is None else newline + indent
data_begin = '['
data_end = ']'
item_separator = encoder.item_separator
key_wrapper = '"'
key_separator = encoder.key_separator
row_begin = '{'
row_end = '}'
row_separator = item_separator if indent is None else item_separator.rstrip(
)
# Function shortcuts
write = file.write
serialize = encoder.encode
# Binary decoding
if PY2:
headers = [
key.decode() if isinstance(key, bytes) else key
for key in headers
]
def serialize(value):
string = encoder.encode(value)
if isinstance(string, bytes):
string = string.decode()
return string
# Data writing
encoder.indent = None
write(data_begin)
first_row = True
for row in data:
if not first_row:
write(row_separator)
write(newline_indent)
write(row_begin)
first_item = True
for key, value in zip(headers, row):
if not first_item:
write(item_separator)
write(key_wrapper)
write(key)
write(key_wrapper)
write(key_separator)
serialized_value = serialize(value)
write(serialized_value)
first_item = False
write(row_end)
first_row = False
if indent is not None:
write(newline)
write(data_end)
encoder.indent = indent
