Re-land "Check in a simple pure-python based Markdown previewer."
This re-lands #352450 with a fix to make checklicenses.py happy.
R=thestig@chromium.org
TBR=jam@chromium.org
Review URL: https://codereview.chromium.org/1392733002
Cr-Original-Commit-Position: refs/heads/master@{#352731}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 27c171cd168807f85b95ae8aaa797bda02eff319
diff --git a/markdown/extensions/tables.py b/markdown/extensions/tables.py
new file mode 100644
index 0000000..368321d
--- /dev/null
+++ b/markdown/extensions/tables.py
@@ -0,0 +1,102 @@
+"""
+Tables Extension for Python-Markdown
+====================================
+
+Added parsing of tables to Python-Markdown.
+
+See <https://pythonhosted.org/Markdown/extensions/tables.html>
+for documentation.
+
+Original code Copyright 2009 [Waylan Limberg](http://achinghead.com)
+
+All changes Copyright 2008-2014 The Python Markdown Project
+
+License: [BSD](http://www.opensource.org/licenses/bsd-license.php)
+
+"""
+
+from __future__ import absolute_import
+from __future__ import unicode_literals
+from . import Extension
+from ..blockprocessors import BlockProcessor
+from ..util import etree
+
+
+class TableProcessor(BlockProcessor):
+ """ Process Tables. """
+
+ def test(self, parent, block):
+ rows = block.split('\n')
+ return (len(rows) > 1 and '|' in rows[0] and
+ '|' in rows[1] and '-' in rows[1] and
+ rows[1].strip()[0] in ['|', ':', '-'])
+
+ def run(self, parent, blocks):
+ """ Parse a table block and build table. """
+ block = blocks.pop(0).split('\n')
+ header = block[0].strip()
+ seperator = block[1].strip()
+ rows = [] if len(block) < 3 else block[2:]
+ # Get format type (bordered by pipes or not)
+ border = False
+ if header.startswith('|'):
+ border = True
+ # Get alignment of columns
+ align = []
+ for c in self._split_row(seperator, border):
+ if c.startswith(':') and c.endswith(':'):
+ align.append('center')
+ elif c.startswith(':'):
+ align.append('left')
+ elif c.endswith(':'):
+ align.append('right')
+ else:
+ align.append(None)
+ # Build table
+ table = etree.SubElement(parent, 'table')
+ thead = etree.SubElement(table, 'thead')
+ self._build_row(header, thead, align, border)
+ tbody = etree.SubElement(table, 'tbody')
+ for row in rows:
+ self._build_row(row.strip(), tbody, align, border)
+
+ def _build_row(self, row, parent, align, border):
+ """ Given a row of text, build table cells. """
+ tr = etree.SubElement(parent, 'tr')
+ tag = 'td'
+ if parent.tag == 'thead':
+ tag = 'th'
+ cells = self._split_row(row, border)
+ # We use align here rather than cells to ensure every row
+ # contains the same number of columns.
+ for i, a in enumerate(align):
+ c = etree.SubElement(tr, tag)
+ try:
+ c.text = cells[i].strip()
+ except IndexError: # pragma: no cover
+ c.text = ""
+ if a:
+ c.set('align', a)
+
+ def _split_row(self, row, border):
+ """ split a row of text into list of cells. """
+ if border:
+ if row.startswith('|'):
+ row = row[1:]
+ if row.endswith('|'):
+ row = row[:-1]
+ return row.split('|')
+
+
+class TableExtension(Extension):
+ """ Add tables to Markdown. """
+
+ def extendMarkdown(self, md, md_globals):
+ """ Add an instance of TableProcessor to BlockParser. """
+ md.parser.blockprocessors.add('table',
+ TableProcessor(md.parser),
+ '<hashheader')
+
+
+def makeExtension(*args, **kwargs):
+ return TableExtension(*args, **kwargs)