# $Id: tables.py 8377 2019-08-27 19:49:45Z milde $
# Authors: David Goodger <goodger@python.org>; David Priest
# Copyright: This module has been placed in the public domain.
"""
Directives for table elements.
"""
__docformat__ = 'reStructuredText'
import sys
import os.path
import csv
from docutils import io, nodes, statemachine, utils
from docutils.utils.error_reporting import SafeString
from docutils.utils import SystemMessagePropagation
from docutils.parsers.rst import Directive
from docutils.parsers.rst import directives
def align(argument):
return directives.choice(argument, ('left', 'center', 'right'))
class Table(Directive):
"""
Generic table base class.
"""
optional_arguments = 1
final_argument_whitespace = True
option_spec = {'class': directives.class_option,
'name': directives.unchanged,
'align': align,
'width': directives.length_or_percentage_or_unitless,
'widths': directives.value_or(('auto', 'grid'),
directives.positive_int_list)}
has_content = True
def make_title(self):
if self.arguments:
title_text = self.arguments[0]
text_nodes, messages = self.state.inline_text(title_text,
self.lineno)
title = nodes.title(title_text, '', *text_nodes)
(title.source,
title.line) = self.state_machine.get_source_and_line(self.lineno)
else:
title = None
messages = []
return title, messages
def process_header_option(self):
source = self.state_machine.get_source(self.lineno - 1)
table_head = []
max_header_cols = 0
if 'header' in self.options: # separate table header in option
rows, max_header_cols = self.parse_csv_data_into_rows(
self.options['header'].split('\n'), self.HeaderDialect(),
source)
table_head.extend(rows)
return table_head, max_header_cols
def check_table_dimensions(self, rows, header_rows, stub_columns):
if len(rows) < header_rows:
error = self.state_machine.reporter.error(
'%s header row(s) specified but only %s row(s) of data '
'supplied ("%s" directive).'
% (header_rows, len(rows), self.name), nodes.literal_block(
self.block_text, self.block_text), line=self.lineno)
raise SystemMessagePropagation(error)
if len(rows) == header_rows > 0:
error = self.state_machine.reporter.error(
'Insufficient data supplied (%s row(s)); no data remaining '
'for table body, required by "%s" directive.'
% (len(rows), self.name), nodes.literal_block(
self.block_text, self.block_text), line=self.lineno)
raise SystemMessagePropagation(error)
for row in rows:
if len(row) < stub_columns:
error = self.state_machine.reporter.error(
'%s stub column(s) specified but only %s columns(s) of '
'data supplied ("%s" directive).' %
(stub_columns, len(row), self.name), nodes.literal_block(
self.block_text, self.block_text), line=self.lineno)
raise SystemMessagePropagation(error)
if len(row) == stub_columns > 0:
error = self.state_machine.reporter.error(
'Insufficient data supplied (%s columns(s)); no data remaining '
'for table body, required by "%s" directive.'
% (len(row), self.name), nodes.literal_block(
self.block_text, self.block_text), line=self.lineno)
raise SystemMessagePropagation(error)
def set_table_width(self, table_node):
if 'width' in self.options:
table_node['width'] = self.options.get('width')
@property
def widths(self):
return self.options.get('widths', '')
def get_column_widths(self, max_cols):
if isinstance(self.widths, list):
if len(self.widths) != max_cols:
error = self.state_machine.reporter.error(
'"%s" widths do not match the number of columns in table '
'(%s).' % (self.name, max_cols), nodes.literal_block(
self.block_text, self.block_text), line=self.lineno)
raise SystemMessagePropagation(error)
col_widths = self.widths
elif max_cols:
col_widths = [100 // max_cols] * max_cols
else:
error = self.state_machine.reporter.error(
'No table data detected in CSV file.', nodes.literal_block(
self.block_text, self.block_text), line=self.lineno)
raise SystemMessagePropagation(error)
return col_widths
def extend_short_rows_with_empty_cells(self, columns, parts):
for part in parts:
for row in part:
if len(row) < columns:
row.extend([(0, 0, 0, [])] * (columns - len(row)))
class RSTTable(Table):
def run(self):
if not self.content:
warning = self.state_machine.reporter.warning(
'Content block expected for the "%s" directive; none found.'
% self.name, nodes.literal_block(
self.block_text, self.block_text), line=self.lineno)
return [warning]
title, messages = self.make_title()
node = nodes.Element() # anonymous container for parsing
self.state.nested_parse(self.content, self.content_offset, node)
if len(node) != 1 or not isinstance(node[0], nodes.table):
error = self.state_machine.reporter.error(
'Error parsing content block for the "%s" directive: exactly '
'one table expected.' % self.name, nodes.literal_block(
self.block_text, self.block_text), line=self.lineno)
return [error]
table_node = node[0]
table_node['classes'] += self.options.get('class', [])
self.set_table_width(table_node)
if 'align' in self.options:
table_node['align'] = self.options.get('align')
tgroup = table_node[0]
if isinstance(self.widths, list):
colspecs = [child for child in tgroup.children
if child.tagname == 'colspec']
for colspec, col_width in zip(colspecs, self.widths):
colspec['colwidth'] = col_width
# @@@ the colwidths argument for <tgroup> is not part of the
# XML Exchange Table spec (https://www.oasis-open.org/specs/tm9901.htm)
# and hence violates the docutils.dtd.
if self.widths == 'auto':
table_node['classes'] += ['colwidths-auto']
elif self.widths: # "grid" or list of integers
table_node['classes'] += ['colwidths-given']
self.add_name(table_node)
if title:
table_node.insert(0, title)
return [table_node] + messages
class CSVTable(Table):
option_spec = {'header-rows': directives.nonnegative_int,
'stub-columns': directives.nonnegative_int,
'header': directives.unchanged,
'width': directives.length_or_percentage_or_unitless,
'widths': directives.value_or(('auto', ),
directives.positive_int_list),
'file': directives.path,
'url': directives.uri,
'encoding': directives.encoding,
'class': directives.class_option,
'name': directives.unchanged,
'align': align,
# field delimiter char
'delim': directives.single_char_or_whitespace_or_unicode,
# treat whitespace after delimiter as significant
'keepspace': directives.flag,
# text field quote/unquote char:
'quote': directives.single_char_or_unicode,
# char used to escape delim & quote as-needed:
'escape': directives.single_char_or_unicode,}
class DocutilsDialect(csv.Dialect):
"""CSV dialect for `csv_table` directive."""
delimiter = ','
quotechar = '"'
doublequote = True
skipinitialspace = True
strict = True
lineterminator = '\n'
quoting = csv.QUOTE_MINIMAL
def __init__(self, options):
if 'delim' in options:
self.delimiter = CSVTable.encode_for_csv(options['delim'])
if 'keepspace' in options:
self.skipinitialspace = False
if 'quote' in options:
self.quotechar = CSVTable.encode_for_csv(options['quote'])
if 'escape' in options:
self.doublequote = False
self.escapechar = CSVTable.encode_for_csv(options['escape'])
csv.Dialect.__init__(self)
class HeaderDialect(csv.Dialect):
"""CSV dialect to use for the "header" option data."""
delimiter = ','
quotechar = '"'
escapechar = '\\'
doublequote = False
skipinitialspace = True
strict = True
lineterminator = '\n'
quoting = csv.QUOTE_MINIMAL
def check_requirements(self):
pass
def run(self):
try:
if (not self.state.document.settings.file_insertion_enabled
and ('file' in self.options
or 'url' in self.options)):
warning = self.state_machine.reporter.warning(
'File and URL access deactivated; ignoring "%s" '
'directive.' % self.name, nodes.literal_block(
self.block_text, self.block_text), line=self.lineno)
return [warning]
self.check_requirements()
title, messages = self.make_title()
csv_data, source = self.get_csv_data()
table_head, max_header_cols = self.process_header_option()
rows, max_cols = self.parse_csv_data_into_rows(
csv_data, self.DocutilsDialect(self.options), source)
max_cols = max(max_cols, max_header_cols)
header_rows = self.options.get('header-rows', 0)
stub_columns = self.options.get('stub-columns', 0)
self.check_table_dimensions(rows, header_rows, stub_columns)
table_head.extend(rows[:header_rows])
table_body = rows[header_rows:]
col_widths = self.get_column_widths(max_cols)
self.extend_short_rows_with_empty_cells(max_cols,
(table_head, table_body))
except SystemMessagePropagation as detail:
return [detail.args[0]]
except csv.Error as detail:
message = str(detail)
if sys.version_info < (3, 0) and '1-character string' in message:
message += '\nwith Python 2.x this must be an ASCII character.'
error = self.state_machine.reporter.error(
'Error with CSV data in "%s" directive:\n%s'
% (self.name, message), nodes.literal_block(
self.block_text, self.block_text), line=self.lineno)
return [error]
table = (col_widths, table_head, table_body)
table_node = self.state.build_table(table, self.content_offset,
stub_columns, widths=self.widths)
table_node['classes'] += self.options.get('class', [])
if 'align' in self.options:
table_node['align'] = self.options.get('align')
self.set_table_width(table_node)
self.add_name(table_node)
if title:
table_node.insert(0, title)
return [table_node] + messages
def get_csv_data(self):
"""
Get CSV data from the directive content, from an external
file, or from a URL reference.
"""
encoding = self.options.get(
'encoding', self.state.document.settings.input_encoding)
error_handler = self.state.document.settings.input_encoding_error_handler
if self.content:
# CSV data is from directive content.
if 'file' in self.options or 'url' in self.options:
error = self.state_machine.reporter.error(
'"%s" directive may not both specify an external file and'
' have content.' % self.name, nodes.literal_block(
self.block_text, self.block_text), line=self.lineno)
raise SystemMessagePropagation(error)
source = self.content.source(0)
csv_data = self.content
elif 'file' in self.options:
# CSV data is from an external file.
if 'url' in self.options:
error = self.state_machine.reporter.error(
'The "file" and "url" options may not be simultaneously'
' specified for the "%s" directive.' % self.name,
nodes.literal_block(self.block_text, self.block_text),
line=self.lineno)
raise SystemMessagePropagation(error)
source_dir = os.path.dirname(
os.path.abspath(self.state.document.current_source))
source = os.path.normpath(os.path.join(source_dir,
self.options['file']))
source = utils.relative_path(None, source)
try:
self.state.document.settings.record_dependencies.add(source)
csv_file = io.FileInput(source_path=source,
encoding=encoding,
error_handler=error_handler)
csv_data = csv_file.read().splitlines()
except IOError as error:
severe = self.state_machine.reporter.severe(
u'Problems with "%s" directive path:\n%s.'
% (self.name, SafeString(error)),
nodes.literal_block(self.block_text, self.block_text),
line=self.lineno)
raise SystemMessagePropagation(severe)
elif 'url' in self.options:
# CSV data is from a URL.
# Do not import urllib2 at the top of the module because
# it may fail due to broken SSL dependencies, and it takes
# about 0.15 seconds to load.
if sys.version_info >= (3, 0):
from urllib.request import urlopen
from urllib.error import URLError
else:
from urllib2 import urlopen, URLError
source = self.options['url']
try:
csv_text = urlopen(source).read()
except (URLError, IOError, OSError, ValueError) as error:
severe = self.state_machine.reporter.severe(
'Problems with "%s" directive URL "%s":\n%s.'
% (self.name, self.options['url'], SafeString(error)),
nodes.literal_block(self.block_text, self.block_text),
line=self.lineno)
raise SystemMessagePropagation(severe)
csv_file = io.StringInput(
source=csv_text, source_path=source, encoding=encoding,
error_handler=(self.state.document.settings.\
input_encoding_error_handler))
csv_data = csv_file.read().splitlines()
else:
error = self.state_machine.reporter.warning(
'The "%s" directive requires content; none supplied.'
% self.name, nodes.literal_block(
self.block_text, self.block_text), line=self.lineno)
raise SystemMessagePropagation(error)
return csv_data, source
if sys.version_info < (3, 0):
# 2.x csv module doesn't do Unicode
def decode_from_csv(s):
return s.decode('utf-8')
def encode_for_csv(s):
return s.encode('utf-8')
else:
def decode_from_csv(s):
return s
def encode_for_csv(s):
return s
decode_from_csv = staticmethod(decode_from_csv)
encode_for_csv = staticmethod(encode_for_csv)
def parse_csv_data_into_rows(self, csv_data, dialect, source):
# csv.py doesn't do Unicode; encode temporarily as UTF-8
csv_reader = csv.reader([self.encode_for_csv(line + '\n')
for line in csv_data],
dialect=dialect)
rows = []
max_cols = 0
for row in csv_reader:
row_data = []
for cell in row:
# decode UTF-8 back to Unicode
cell_text = self.decode_from_csv(cell)
cell_data = (0, 0, 0, statemachine.StringList(
cell_text.splitlines(), source=source))
row_data.append(cell_data)
rows.append(row_data)
max_cols = max(max_cols, len(row))
return rows, max_cols
class ListTable(Table):
"""
Implement tables whose data is encoded as a uniform two-level bullet list.
For further ideas, see
http://docutils.sf.net/docs/dev/rst/alternatives.html#list-driven-tables
"""
option_spec = {'header-rows': directives.nonnegative_int,
'stub-columns': directives.nonnegative_int,
'width': directives.length_or_percentage_or_unitless,
'widths': directives.value_or(('auto', ),
directives.positive_int_list),
'class': directives.class_option,
'name': directives.unchanged,
'align': align}
def run(self):
if not self.content:
error = self.state_machine.reporter.error(
'The "%s" directive is empty; content required.' % self.name,
nodes.literal_block(self.block_text, self.block_text),
line=self.lineno)
return [error]
title, messages = self.make_title()
node = nodes.Element() # anonymous container for parsing
self.state.nested_parse(self.content, self.content_offset, node)
try:
num_cols, col_widths = self.check_list_content(node)
table_data = [[item.children for item in row_list[0]]
for row_list in node[0]]
header_rows = self.options.get('header-rows', 0)
stub_columns = self.options.get('stub-columns', 0)
self.check_table_dimensions(table_data, header_rows, stub_columns)
except SystemMessagePropagation as detail:
return [detail.args[0]]
table_node = self.build_table_from_list(table_data, col_widths,
header_rows, stub_columns)
if 'align' in self.options:
table_node['align'] = self.options.get('align')
table_node['classes'] += self.options.get('class', [])
self.set_table_width(table_node)
self.add_name(table_node)
if title:
table_node.insert(0, title)
return [table_node] + messages
def check_list_content(self, node):
if len(node) != 1 or not isinstance(node[0], nodes.bullet_list):
error = self.state_machine.reporter.error(
'Error parsing content block for the "%s" directive: '
'exactly one bullet list expected.' % self.name,
nodes.literal_block(self.block_text, self.block_text),
line=self.lineno)
raise SystemMessagePropagation(error)
list_node = node[0]
num_cols = 0
# Check for a uniform two-level bullet list:
for item_index in range(len(list_node)):
item = list_node[item_index]
if len(item) != 1 or not isinstance(item[0], nodes.bullet_list):
error = self.state_machine.reporter.error(
'Error parsing content block for the "%s" directive: '
'two-level bullet list expected, but row %s does not '
'contain a second-level bullet list.'
% (self.name, item_index + 1), nodes.literal_block(
self.block_text, self.block_text), line=self.lineno)
raise SystemMessagePropagation(error)
elif item_index:
if len(item[0]) != num_cols:
error = self.state_machine.reporter.error(
'Error parsing content block for the "%s" directive: '
'uniform two-level bullet list expected, but row %s '
'does not contain the same number of items as row 1 '
'(%s vs %s).'
% (self.name, item_index + 1, len(item[0]), num_cols),
nodes.literal_block(self.block_text, self.block_text),
line=self.lineno)
raise SystemMessagePropagation(error)
else:
num_cols = len(item[0])
col_widths = self.get_column_widths(num_cols)
return num_cols, col_widths
def build_table_from_list(self, table_data, col_widths, header_rows, stub_columns):
table = nodes.table()
if self.widths == 'auto':
table['classes'] += ['colwidths-auto']
elif self.widths: # "grid" or list of integers
table['classes'] += ['colwidths-given']
tgroup = nodes.tgroup(cols=len(col_widths))
table += tgroup
for col_width in col_widths:
colspec = nodes.colspec()
if col_width is not None:
colspec.attributes['colwidth'] = col_width
if stub_columns:
colspec.attributes['stub'] = 1
stub_columns -= 1
tgroup += colspec
rows = []
for row in table_data:
row_node = nodes.row()
for cell in row:
entry = nodes.entry()
entry += cell
row_node += entry
rows.append(row_node)
if header_rows:
thead = nodes.thead()
thead.extend(rows[:header_rows])
tgroup += thead
tbody = nodes.tbody()
tbody.extend(rows[header_rows:])
tgroup += tbody
return table