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#!/usr/bin/env python
"""
Convert [tables](https://github.com/trentm/python-markdown2/wiki/tables)
a given Markdown document such that columns are aligned.
Limitations:
- Can't handle tables where cells have a pipe.
"""
__version__ = "1.0.0"
import codecs
import re
import sys
from collections import defaultdict
p = print
def e(*args, **kwargs):
kwargs['file'] = sys.stderr
p(*args, **kwargs)
#---- internal support stuff
def tables_align_columns(path):
def _table_sub(match):
head, underline, body = match.groups()
data_rows = [
[cell.strip() for cell in head.strip().strip('|').split('|')],
]
for line in body.strip('\n').split('\n'):
data_rows.append([cell.strip() for cell in line.strip().strip('|').split('|')])
width_from_col_idx = defaultdict(int)
for data_row in data_rows:
for col_idx, cell in enumerate(data_row):
width_from_col_idx[col_idx] = max(
2, width_from_col_idx[col_idx], len(cell))
# Determine aligns for columns.
ucells = [cell.strip() for cell in underline.strip('| \t\n').split('|')]
align_from_col_idx = {}
for col_idx, cell in enumerate(ucells):
if cell[0] == ':' and cell[-1] == ':':
align_from_col_idx[col_idx] = 'center'
elif cell[0] == ':':
align_from_col_idx[col_idx] = 'left'
elif cell[-1] == ':':
align_from_col_idx[col_idx] = 'right'
else:
align_from_col_idx[col_idx] = None
table = []
for data_row in data_rows:
row = []
#e('align_from_col_idx:', align_from_col_idx)
#e('data_row:', data_row)
for col_idx, cell in enumerate(data_row):
width = width_from_col_idx[col_idx]
try:
align = align_from_col_idx[col_idx]
except KeyError:
# Limitation: We hit a table row where a cell has a
# literal `|` in it. We can't currently handle that, so
# lets just skip this table.
e('tables-align-columns: warning: skipping a table '
'with literal `|`: %r' % match.group(0))
return match.group(0)
if align == 'center':
space = width - len(cell)
left = space / 2
right = space - left
row.append(' '*left + cell + ' '*right)
elif align == 'right':
row.append('%%%ds' % width % cell)
else:
row.append('%%-%ds' % width % cell)
table.append(row)
underline = []
for col_idx, cell in enumerate(data_rows[0]):
width = width_from_col_idx[col_idx]
align = align_from_col_idx[col_idx]
if align == 'center':
underline.append(':' + '-'*(width-2) + ':')
elif align == 'right':
underline.append('-'*(width-1) + ':')
elif align == 'left':
underline.append(':' + '-'*(width-1))
else:
underline.append('-'*width)
table[1:1] = [underline]
#e(pformat(table, width=200))
table_str = '\n'.join(('| ' + ' | '.join(r) + ' |') for r in table)
return table_str + '\n'
text = codecs.open(path, 'rb', 'utf8').read()
less_than_tab = 3
table_re = re.compile(r'''
(?:(?<=\n\n)|\A\n?) # leading blank line
^[ ]{0,%d} # allowed whitespace
(.*[|].*) \n # $1: header row (at least one pipe)
^[ ]{0,%d} # allowed whitespace
( # $2: underline row
# underline row with leading bar
(?: \|\ *:?-+:?\ * )+ \|? \n
|
# or, underline row without leading bar
(?: \ *:?-+:?\ *\| )+ (?: \ *:?-+:?\ * )? \n
)
( # $3: data rows
(?:
^[ ]{0,%d}(?!\ ) # ensure line begins with 0 to less_than_tab spaces
.*\|.* \n
)+
)
''' % (less_than_tab, less_than_tab, less_than_tab), re.M | re.X)
return table_re.sub(_table_sub, text)
#---- mainline
def main(argv):
for path in argv[1:]:
text = tables_align_columns(path)
sys.stdout.write(text.encode(
sys.stdout.encoding or "utf-8", 'xmlcharrefreplace'))
if __name__ == "__main__":
sys.exit( main(sys.argv) )
|
