1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
|
from rpython.rlib.rutf8 import Utf8StringIterator, Utf8StringBuilder, unichr_as_utf8
from rpython.rlib import objectmodel
from rpython.rlib.rarithmetic import r_uint
from pypy.interpreter.baseobjspace import W_Root
from pypy.interpreter.error import OperationError
from pypy.interpreter.gateway import unwrap_spec
from pypy.interpreter.typedef import TypeDef, interp2app
from pypy.interpreter.typedef import interp_attrproperty_w, interp_attrproperty
from pypy.module._csv.interp_csv import _build_dialect
from pypy.module._csv.interp_csv import (QUOTE_MINIMAL, QUOTE_ALL,
QUOTE_NONNUMERIC, QUOTE_NONE)
(START_RECORD, START_FIELD, ESCAPED_CHAR, IN_FIELD,
IN_QUOTED_FIELD, ESCAPE_IN_QUOTED_FIELD, QUOTE_IN_QUOTED_FIELD,
EAT_CRNL, AFTER_ESCAPED_CRNL) = range(9)
class W_Reader(W_Root):
def __init__(self, space, dialect, w_iter):
self.space = space
self.dialect = dialect
self.w_iter = w_iter
self.line_num = 0
self.sizehint = 1 # just used for first line
def iter_w(self):
return self
@objectmodel.dont_inline
def error(self, msg):
space = self.space
msg = 'line %d: %s' % (self.line_num, msg)
w_module = space.getbuiltinmodule('_csv')
w_error = space.getattr(w_module, space.newtext('Error'))
raise OperationError(w_error, space.newtext(msg))
def add_char(self, field_builder, c):
assert field_builder is not None
if field_builder.getlength() >= field_limit.limit:
raise self.error("field larger than field limit")
field_builder.append_code(c)
def save_field(self, field_builder):
space = self.space
field = field_builder.build()
w_obj = space.newutf8(field, field_builder.getlength())
if self.numeric_field:
self.numeric_field = False
w_obj = space.call_function(space.w_float, w_obj)
self.fields_w.append(w_obj)
def next_w(self):
space = self.space
dialect = self.dialect
self.fields_w = objectmodel.newlist_hint(self.sizehint)
self.numeric_field = False
field_builder = None # valid iff state not in [START_RECORD, EAT_CRNL]
state = START_RECORD
#
while True:
try:
w_line = space.next(self.w_iter)
except OperationError as e:
if e.match(space, space.w_StopIteration):
if (field_builder is not None and
state != START_RECORD and state != EAT_CRNL and
(len(field_builder.build()) > 0 or
state == IN_QUOTED_FIELD)):
if dialect.strict:
raise self.error("unexpected end of data")
else:
self.save_field(field_builder)
break
raise
self.line_num += 1
if space.isinstance_w(w_line, space.w_bytes):
raise self.error("iterator should return strings, not bytes "
"(did you open the file in text mode?")
line = space.utf8_w(w_line)
for c in Utf8StringIterator(line):
if state == START_RECORD:
if c == ord(u'\n') or c == ord(u'\r'):
state = EAT_CRNL
continue
# normal character - handle as START_FIELD
state = START_FIELD
# fall-through to the next case
if state == START_FIELD:
field_builder = Utf8StringBuilder(64)
# expecting field
if c == ord(u'\n') or c == ord(u'\r'):
# save empty field
self.save_field(field_builder)
state = EAT_CRNL
elif (c == dialect.quotechar and
dialect.quoting != QUOTE_NONE):
# start quoted field
state = IN_QUOTED_FIELD
elif c == dialect.escapechar:
# possible escaped character
state = ESCAPED_CHAR
elif c == ord(u' ') and dialect.skipinitialspace:
# ignore space at start of field
pass
elif c == dialect.delimiter:
# save empty field
self.save_field(field_builder)
else:
# begin new unquoted field
if dialect.quoting == QUOTE_NONNUMERIC:
self.numeric_field = True
self.add_char(field_builder, c)
state = IN_FIELD
elif state == ESCAPED_CHAR:
if c == ord(u'\n') or c == ord(u'\r'):
self.add_char(field_builder, c)
state = AFTER_ESCAPED_CRNL
else:
self.add_char(field_builder, c)
state = IN_FIELD
elif state == IN_FIELD or state == AFTER_ESCAPED_CRNL:
# in unquoted field
if c == ord(u'\n') or c == ord(u'\r'):
# end of line
self.save_field(field_builder)
state = EAT_CRNL
elif c == dialect.escapechar:
# possible escaped character
state = ESCAPED_CHAR
elif c == dialect.delimiter:
# save field - wait for new field
self.save_field(field_builder)
state = START_FIELD
else:
# normal character - save in field
self.add_char(field_builder, c)
elif state == IN_QUOTED_FIELD:
# in quoted field
if c == dialect.escapechar:
# Possible escape character
state = ESCAPE_IN_QUOTED_FIELD
elif (c == dialect.quotechar and
dialect.quoting != QUOTE_NONE):
if dialect.doublequote:
# doublequote; " represented by ""
state = QUOTE_IN_QUOTED_FIELD
else:
# end of quote part of field
state = IN_FIELD
else:
# normal character - save in field
self.add_char(field_builder, c)
elif state == ESCAPE_IN_QUOTED_FIELD:
self.add_char(field_builder, c)
state = IN_QUOTED_FIELD
elif state == QUOTE_IN_QUOTED_FIELD:
# doublequote - seen a quote in an quoted field
if (dialect.quoting != QUOTE_NONE and
c == dialect.quotechar):
# save "" as "
self.add_char(field_builder, c)
state = IN_QUOTED_FIELD
elif c == dialect.delimiter:
# save field - wait for new field
self.save_field(field_builder)
state = START_FIELD
elif c == ord(u'\n') or c == ord(u'\r'):
# end of line
self.save_field(field_builder)
state = EAT_CRNL
elif not dialect.strict:
self.add_char(field_builder, c)
state = IN_FIELD
else:
# illegal
raise self.error("'%s' expected after '%s'" % (
unichr_as_utf8(r_uint(dialect.delimiter)), unichr_as_utf8(r_uint(dialect.quotechar))))
elif state == EAT_CRNL:
if not (c == ord(u'\n') or c == ord(u'\r')):
raise self.error("new-line character seen in unquoted field - "
"do you need to open the file with newline=''?")
if state == IN_FIELD or state == QUOTE_IN_QUOTED_FIELD:
self.save_field(field_builder)
break
elif state == ESCAPED_CHAR:
self.add_char(field_builder, ord(u'\n'))
state = IN_FIELD
elif state == IN_QUOTED_FIELD:
pass
elif state == ESCAPE_IN_QUOTED_FIELD:
self.add_char(field_builder, ord(u'\n'))
state = IN_QUOTED_FIELD
elif state == START_FIELD:
# save empty field
field_builder = Utf8StringBuilder()
self.save_field(field_builder)
break
elif state == AFTER_ESCAPED_CRNL:
continue
else:
break
#
w_result = space.newlist(self.fields_w)
# assume all lines have the same number of fields
self.sizehint = len(self.fields_w)
self.fields_w = None
return w_result
def csv_reader(space, w_iterator, w_dialect=None,
w_delimiter = None,
w_doublequote = None,
w_escapechar = None,
w_lineterminator = None,
w_quotechar = None,
w_quoting = None,
w_skipinitialspace = None,
w_strict = None,
):
"""
csv_reader = reader(iterable [, dialect='excel']
[optional keyword args])
for row in csv_reader:
process(row)
The "iterable" argument can be any object that returns a line
of input for each iteration, such as a file object or a list. The
optional \"dialect\" parameter is discussed below. The function
also accepts optional keyword arguments which override settings
provided by the dialect.
The returned object is an iterator. Each iteration returns a row
of the CSV file (which can span multiple input lines)"""
w_iter = space.iter(w_iterator)
dialect = _build_dialect(space, w_dialect, w_delimiter, w_doublequote,
w_escapechar, w_lineterminator, w_quotechar,
w_quoting, w_skipinitialspace, w_strict)
return W_Reader(space, dialect, w_iter)
W_Reader.typedef = TypeDef(
'_csv.reader',
dialect = interp_attrproperty_w('dialect', W_Reader),
line_num = interp_attrproperty('line_num', W_Reader,
wrapfn="newint"),
__iter__ = interp2app(W_Reader.iter_w),
__next__ = interp2app(W_Reader.next_w),
__doc__ = """CSV reader
Reader objects are responsible for reading and parsing tabular data
in CSV format.""")
W_Reader.typedef.acceptable_as_base_class = False
# ____________________________________________________________
class FieldLimit:
limit = 128 * 1024 # max parsed field size
field_limit = FieldLimit()
@unwrap_spec(new_limit=int)
def csv_field_size_limit(space, new_limit=-1):
old_limit = field_limit.limit
if new_limit >= 0:
field_limit.limit = new_limit
return space.newint(old_limit)
|
