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# minirst.py - minimal reStructuredText parser
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#
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# Copyright 2009, 2010 Matt Mackall <mpm@selenic.com> and others
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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"""simplified reStructuredText parser.
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This parser knows just enough about reStructuredText to parse the
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Mercurial docstrings.
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It cheats in a major way: nested blocks are not really nested. They
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are just indented blocks that look like they are nested. This relies
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on the user to keep the right indentation for the blocks.
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Remember to update http://mercurial.selenic.com/wiki/HelpStyleGuide
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when adding support for new constructs.
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"""
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import re
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import util, encoding
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from i18n import _
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def replace(text, substs):
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'''
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Apply a list of (find, replace) pairs to a text.
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>>> replace("foo bar", [('f', 'F'), ('b', 'B')])
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'Foo Bar'
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>>> encoding.encoding = 'latin1'
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>>> replace('\\x81\\\\', [('\\\\', '/')])
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'\\x81/'
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>>> encoding.encoding = 'shiftjis'
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>>> replace('\\x81\\\\', [('\\\\', '/')])
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'\\x81\\\\'
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'''
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# some character encodings (cp932 for Japanese, at least) use
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# ASCII characters other than control/alphabet/digit as a part of
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# multi-bytes characters, so direct replacing with such characters
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# on strings in local encoding causes invalid byte sequences.
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utext = text.decode(encoding.encoding)
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for f, t in substs:
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utext = utext.replace(f, t)
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return utext.encode(encoding.encoding)
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_blockre = re.compile(r"\n(?:\s*\n)+")
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def findblocks(text):
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"""Find continuous blocks of lines in text.
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Returns a list of dictionaries representing the blocks. Each block
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has an 'indent' field and a 'lines' field.
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"""
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blocks = []
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for b in _blockre.split(text.lstrip('\n').rstrip()):
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lines = b.splitlines()
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if lines:
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indent = min((len(l) - len(l.lstrip())) for l in lines)
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lines = [l[indent:] for l in lines]
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blocks.append(dict(indent=indent, lines=lines))
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return blocks
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def findliteralblocks(blocks):
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"""Finds literal blocks and adds a 'type' field to the blocks.
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Literal blocks are given the type 'literal', all other blocks are
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given type the 'paragraph'.
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"""
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i = 0
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while i < len(blocks):
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# Searching for a block that looks like this:
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#
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# +------------------------------+
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# | paragraph |
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# | (ends with "::") |
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# +------------------------------+
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# +---------------------------+
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# | indented literal block |
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# +---------------------------+
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blocks[i]['type'] = 'paragraph'
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if blocks[i]['lines'][-1].endswith('::') and i + 1 < len(blocks):
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indent = blocks[i]['indent']
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adjustment = blocks[i + 1]['indent'] - indent
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if blocks[i]['lines'] == ['::']:
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# Expanded form: remove block
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del blocks[i]
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i -= 1
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elif blocks[i]['lines'][-1].endswith(' ::'):
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# Partially minimized form: remove space and both
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# colons.
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blocks[i]['lines'][-1] = blocks[i]['lines'][-1][:-3]
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else:
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# Fully minimized form: remove just one colon.
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blocks[i]['lines'][-1] = blocks[i]['lines'][-1][:-1]
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# List items are formatted with a hanging indent. We must
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# correct for this here while we still have the original
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# information on the indentation of the subsequent literal
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# blocks available.
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m = _bulletre.match(blocks[i]['lines'][0])
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if m:
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indent += m.end()
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adjustment -= m.end()
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# Mark the following indented blocks.
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while i + 1 < len(blocks) and blocks[i + 1]['indent'] > indent:
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blocks[i + 1]['type'] = 'literal'
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blocks[i + 1]['indent'] -= adjustment
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i += 1
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i += 1
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return blocks
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_bulletre = re.compile(r'(-|[0-9A-Za-z]+\.|\(?[0-9A-Za-z]+\)|\|) ')
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_optionre = re.compile(r'^(-([a-zA-Z0-9]), )?(--[a-z0-9-]+)'
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r'((.*) +)(.*)$')
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_fieldre = re.compile(r':(?![: ])([^:]*)(?<! ):[ ]+(.*)')
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_definitionre = re.compile(r'[^ ]')
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_tablere = re.compile(r'(=+\s+)*=+')
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def splitparagraphs(blocks):
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"""Split paragraphs into lists."""
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# Tuples with (list type, item regexp, single line items?). Order
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# matters: definition lists has the least specific regexp and must
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# come last.
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listtypes = [('bullet', _bulletre, True),
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('option', _optionre, True),
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('field', _fieldre, True),
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('definition', _definitionre, False)]
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def match(lines, i, itemre, singleline):
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"""Does itemre match an item at line i?
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A list item can be followed by an indented line or another list
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item (but only if singleline is True).
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"""
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line1 = lines[i]
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line2 = i + 1 < len(lines) and lines[i + 1] or ''
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if not itemre.match(line1):
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return False
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if singleline:
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return line2 == '' or line2[0] == ' ' or itemre.match(line2)
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else:
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return line2.startswith(' ')
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i = 0
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while i < len(blocks):
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if blocks[i]['type'] == 'paragraph':
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lines = blocks[i]['lines']
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for type, itemre, singleline in listtypes:
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if match(lines, 0, itemre, singleline):
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items = []
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for j, line in enumerate(lines):
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if match(lines, j, itemre, singleline):
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items.append(dict(type=type, lines=[],
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indent=blocks[i]['indent']))
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items[-1]['lines'].append(line)
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blocks[i:i + 1] = items
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break
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i += 1
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return blocks
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_fieldwidth = 14
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def updatefieldlists(blocks):
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"""Find key for field lists."""
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i = 0
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while i < len(blocks):
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if blocks[i]['type'] != 'field':
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i += 1
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continue
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j = i
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while j < len(blocks) and blocks[j]['type'] == 'field':
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m = _fieldre.match(blocks[j]['lines'][0])
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key, rest = m.groups()
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blocks[j]['lines'][0] = rest
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blocks[j]['key'] = key
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j += 1
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i = j + 1
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return blocks
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def updateoptionlists(blocks):
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i = 0
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while i < len(blocks):
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if blocks[i]['type'] != 'option':
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i += 1
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continue
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optstrwidth = 0
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j = i
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while j < len(blocks) and blocks[j]['type'] == 'option':
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m = _optionre.match(blocks[j]['lines'][0])
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shortoption = m.group(2)
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group3 = m.group(3)
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longoption = group3[2:].strip()
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desc = m.group(6).strip()
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longoptionarg = m.group(5).strip()
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blocks[j]['lines'][0] = desc
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noshortop = ''
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if not shortoption:
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noshortop = ' '
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opt = "%s%s" % (shortoption and "-%s " % shortoption or '',
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("%s--%s %s") % (noshortop, longoption,
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longoptionarg))
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opt = opt.rstrip()
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blocks[j]['optstr'] = opt
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optstrwidth = max(optstrwidth, encoding.colwidth(opt))
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j += 1
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for block in blocks[i:j]:
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block['optstrwidth'] = optstrwidth
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i = j + 1
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return blocks
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def prunecontainers(blocks, keep):
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"""Prune unwanted containers.
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The blocks must have a 'type' field, i.e., they should have been
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run through findliteralblocks first.
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"""
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pruned = []
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i = 0
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while i + 1 < len(blocks):
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# Searching for a block that looks like this:
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#
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# +-------+---------------------------+
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# | ".. container ::" type |
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# +---+ |
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# | blocks |
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# +-------------------------------+
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if (blocks[i]['type'] == 'paragraph' and
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blocks[i]['lines'][0].startswith('.. container::')):
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indent = blocks[i]['indent']
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adjustment = blocks[i + 1]['indent'] - indent
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containertype = blocks[i]['lines'][0][15:]
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prune = containertype not in keep
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if prune:
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pruned.append(containertype)
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# Always delete "..container:: type" block
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del blocks[i]
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j = i
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i -= 1
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while j < len(blocks) and blocks[j]['indent'] > indent:
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if prune:
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del blocks[j]
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else:
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blocks[j]['indent'] -= adjustment
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j += 1
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i += 1
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return blocks, pruned
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_sectionre = re.compile(r"""^([-=`:.'"~^_*+#])\1+$""")
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def findtables(blocks):
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'''Find simple tables
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Only simple one-line table elements are supported
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'''
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for block in blocks:
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# Searching for a block that looks like this:
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#
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# === ==== ===
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# A B C
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# === ==== === <- optional
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# 1 2 3
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# x y z
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# === ==== ===
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if (block['type'] == 'paragraph' and
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len(block['lines']) > 2 and
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_tablere.match(block['lines'][0]) and
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block['lines'][0] == block['lines'][-1]):
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block['type'] = 'table'
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block['header'] = False
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div = block['lines'][0]
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# column markers are ASCII so we can calculate column
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# position in bytes
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columns = [x for x in xrange(len(div))
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if div[x] == '=' and (x == 0 or div[x - 1] == ' ')]
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rows = []
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for l in block['lines'][1:-1]:
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if l == div:
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block['header'] = True
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continue
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row = []
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# we measure columns not in bytes or characters but in
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# colwidth which makes things tricky
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pos = columns[0] # leading whitespace is bytes
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for n, start in enumerate(columns):
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if n + 1 < len(columns):
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width = columns[n + 1] - start
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v = encoding.getcols(l, pos, width) # gather columns
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pos += len(v) # calculate byte position of end
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row.append(v.strip())
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else:
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row.append(l[pos:].strip())
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rows.append(row)
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block['table'] = rows
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return blocks
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def findsections(blocks):
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"""Finds sections.
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The blocks must have a 'type' field, i.e., they should have been
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run through findliteralblocks first.
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"""
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for block in blocks:
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# Searching for a block that looks like this:
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#
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# +------------------------------+
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# | Section title |
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# | ------------- |
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# +------------------------------+
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if (block['type'] == 'paragraph' and
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len(block['lines']) == 2 and
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encoding.colwidth(block['lines'][0]) == len(block['lines'][1]) and
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_sectionre.match(block['lines'][1])):
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block['underline'] = block['lines'][1][0]
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block['type'] = 'section'
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del block['lines'][1]
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return blocks
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def inlineliterals(blocks):
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substs = [('``', '"')]
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for b in blocks:
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if b['type'] in ('paragraph', 'section'):
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b['lines'] = [replace(l, substs) for l in b['lines']]
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return blocks
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def hgrole(blocks):
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substs = [(':hg:`', '"hg '), ('`', '"')]
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for b in blocks:
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if b['type'] in ('paragraph', 'section'):
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# Turn :hg:`command` into "hg command". This also works
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# when there is a line break in the command and relies on
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# the fact that we have no stray back-quotes in the input
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# (run the blocks through inlineliterals first).
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b['lines'] = [replace(l, substs) for l in b['lines']]
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return blocks
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def addmargins(blocks):
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"""Adds empty blocks for vertical spacing.
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This groups bullets, options, and definitions together with no vertical
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space between them, and adds an empty block between all other blocks.
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"""
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i = 1
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while i < len(blocks):
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if (blocks[i]['type'] == blocks[i - 1]['type'] and
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blocks[i]['type'] in ('bullet', 'option', 'field')):
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i += 1
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else:
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blocks.insert(i, dict(lines=[''], indent=0, type='margin'))
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i += 2
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return blocks
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def prunecomments(blocks):
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"""Remove comments."""
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i = 0
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while i < len(blocks):
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b = blocks[i]
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if b['type'] == 'paragraph' and (b['lines'][0].startswith('.. ') or
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b['lines'] == ['..']):
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del blocks[i]
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if i < len(blocks) and blocks[i]['type'] == 'margin':
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del blocks[i]
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else:
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i += 1
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return blocks
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_admonitionre = re.compile(r"\.\. (admonition|attention|caution|danger|"
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r"error|hint|important|note|tip|warning)::",
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flags=re.IGNORECASE)
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def findadmonitions(blocks):
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"""
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Makes the type of the block an admonition block if
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the first line is an admonition directive
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"""
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i = 0
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while i < len(blocks):
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m = _admonitionre.match(blocks[i]['lines'][0])
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if m:
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blocks[i]['type'] = 'admonition'
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admonitiontitle = blocks[i]['lines'][0][3:m.end() - 2].lower()
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firstline = blocks[i]['lines'][0][m.end() + 1:]
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if firstline:
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blocks[i]['lines'].insert(1, ' ' + firstline)
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blocks[i]['admonitiontitle'] = admonitiontitle
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del blocks[i]['lines'][0]
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i = i + 1
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return blocks
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_admonitiontitles = {'attention': _('Attention:'),
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'caution': _('Caution:'),
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'danger': _('!Danger!') ,
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'error': _('Error:'),
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'hint': _('Hint:'),
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'important': _('Important:'),
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'note': _('Note:'),
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'tip': _('Tip:'),
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'warning': _('Warning!')}
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def formatoption(block, width):
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desc = ' '.join(map(str.strip, block['lines']))
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colwidth = encoding.colwidth(block['optstr'])
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usablewidth = width - 1
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hanging = block['optstrwidth']
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initindent = '%s%s ' % (block['optstr'], ' ' * ((hanging - colwidth)))
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hangindent = ' ' * (encoding.colwidth(initindent) + 1)
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return ' %s\n' % (util.wrap(desc, usablewidth,
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initindent=initindent,
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hangindent=hangindent))
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def formatblock(block, width):
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"""Format a block according to width."""
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if width <= 0:
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width = 78
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indent = ' ' * block['indent']
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if block['type'] == 'admonition':
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admonition = _admonitiontitles[block['admonitiontitle']]
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hang = len(block['lines'][-1]) - len(block['lines'][-1].lstrip())
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defindent = indent + hang * ' '
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|
text = ' '.join(map(str.strip, block['lines']))
|
|
|
return '%s\n%s\n' % (indent + admonition,
|
|
|
util.wrap(text, width=width,
|
|
|
initindent=defindent,
|
|
|
hangindent=defindent))
|
|
|
if block['type'] == 'margin':
|
|
|
return '\n'
|
|
|
if block['type'] == 'literal':
|
|
|
indent += ' '
|
|
|
return indent + ('\n' + indent).join(block['lines']) + '\n'
|
|
|
if block['type'] == 'section':
|
|
|
underline = encoding.colwidth(block['lines'][0]) * block['underline']
|
|
|
return "%s%s\n%s%s\n" % (indent, block['lines'][0],indent, underline)
|
|
|
if block['type'] == 'table':
|
|
|
table = block['table']
|
|
|
# compute column widths
|
|
|
widths = [max([encoding.colwidth(e) for e in c]) for c in zip(*table)]
|
|
|
text = ''
|
|
|
span = sum(widths) + len(widths) - 1
|
|
|
indent = ' ' * block['indent']
|
|
|
hang = ' ' * (len(indent) + span - widths[-1])
|
|
|
|
|
|
for row in table:
|
|
|
l = []
|
|
|
for w, v in zip(widths, row):
|
|
|
pad = ' ' * (w - encoding.colwidth(v))
|
|
|
l.append(v + pad)
|
|
|
l = ' '.join(l)
|
|
|
l = util.wrap(l, width=width, initindent=indent, hangindent=hang)
|
|
|
if not text and block['header']:
|
|
|
text = l + '\n' + indent + '-' * (min(width, span)) + '\n'
|
|
|
else:
|
|
|
text += l + "\n"
|
|
|
return text
|
|
|
if block['type'] == 'definition':
|
|
|
term = indent + block['lines'][0]
|
|
|
hang = len(block['lines'][-1]) - len(block['lines'][-1].lstrip())
|
|
|
defindent = indent + hang * ' '
|
|
|
text = ' '.join(map(str.strip, block['lines'][1:]))
|
|
|
return '%s\n%s\n' % (term, util.wrap(text, width=width,
|
|
|
initindent=defindent,
|
|
|
hangindent=defindent))
|
|
|
subindent = indent
|
|
|
if block['type'] == 'bullet':
|
|
|
if block['lines'][0].startswith('| '):
|
|
|
# Remove bullet for line blocks and add no extra
|
|
|
# indention.
|
|
|
block['lines'][0] = block['lines'][0][2:]
|
|
|
else:
|
|
|
m = _bulletre.match(block['lines'][0])
|
|
|
subindent = indent + m.end() * ' '
|
|
|
elif block['type'] == 'field':
|
|
|
key = block['key']
|
|
|
subindent = indent + _fieldwidth * ' '
|
|
|
if len(key) + 2 > _fieldwidth:
|
|
|
# key too large, use full line width
|
|
|
key = key.ljust(width)
|
|
|
else:
|
|
|
# key fits within field width
|
|
|
key = key.ljust(_fieldwidth)
|
|
|
block['lines'][0] = key + block['lines'][0]
|
|
|
elif block['type'] == 'option':
|
|
|
return formatoption(block, width)
|
|
|
|
|
|
text = ' '.join(map(str.strip, block['lines']))
|
|
|
return util.wrap(text, width=width,
|
|
|
initindent=indent,
|
|
|
hangindent=subindent) + '\n'
|
|
|
|
|
|
def formathtml(blocks):
|
|
|
"""Format RST blocks as HTML"""
|
|
|
|
|
|
out = []
|
|
|
headernest = ''
|
|
|
listnest = []
|
|
|
|
|
|
def openlist(start, level):
|
|
|
if not listnest or listnest[-1][0] != start:
|
|
|
listnest.append((start, level))
|
|
|
out.append('<%s>\n' % start)
|
|
|
|
|
|
blocks = [b for b in blocks if b['type'] != 'margin']
|
|
|
|
|
|
for pos, b in enumerate(blocks):
|
|
|
btype = b['type']
|
|
|
level = b['indent']
|
|
|
lines = b['lines']
|
|
|
|
|
|
if btype == 'admonition':
|
|
|
admonition = _admonitiontitles[b['admonitiontitle']]
|
|
|
text = ' '.join(map(str.strip, lines))
|
|
|
out.append('<p>\n<b>%s</b> %s\n</p>\n' % (admonition, text))
|
|
|
elif btype == 'paragraph':
|
|
|
out.append('<p>\n%s\n</p>\n' % '\n'.join(lines))
|
|
|
elif btype == 'margin':
|
|
|
pass
|
|
|
elif btype == 'literal':
|
|
|
out.append('<pre>\n%s\n</pre>\n' % '\n'.join(lines))
|
|
|
elif btype == 'section':
|
|
|
i = b['underline']
|
|
|
if i not in headernest:
|
|
|
headernest += i
|
|
|
level = headernest.index(i) + 1
|
|
|
out.append('<h%d>%s</h%d>\n' % (level, lines[0], level))
|
|
|
elif btype == 'table':
|
|
|
table = b['table']
|
|
|
t = []
|
|
|
for row in table:
|
|
|
l = []
|
|
|
for v in zip(row):
|
|
|
if not t:
|
|
|
l.append('<th>%s</th>' % v)
|
|
|
else:
|
|
|
l.append('<td>%s</td>' % v)
|
|
|
t.append(' <tr>%s</tr>\n' % ''.join(l))
|
|
|
out.append('<table>\n%s</table>\n' % ''.join(t))
|
|
|
elif btype == 'definition':
|
|
|
openlist('dl', level)
|
|
|
term = lines[0]
|
|
|
text = ' '.join(map(str.strip, lines[1:]))
|
|
|
out.append(' <dt>%s\n <dd>%s\n' % (term, text))
|
|
|
elif btype == 'bullet':
|
|
|
bullet, head = lines[0].split(' ', 1)
|
|
|
if bullet == '-':
|
|
|
openlist('ul', level)
|
|
|
else:
|
|
|
openlist('ol', level)
|
|
|
out.append(' <li> %s\n' % ' '.join([head] + lines[1:]))
|
|
|
elif btype == 'field':
|
|
|
openlist('dl', level)
|
|
|
key = b['key']
|
|
|
text = ' '.join(map(str.strip, lines))
|
|
|
out.append(' <dt>%s\n <dd>%s\n' % (key, text))
|
|
|
elif btype == 'option':
|
|
|
openlist('dl', level)
|
|
|
opt = b['optstr']
|
|
|
desc = ' '.join(map(str.strip, lines))
|
|
|
out.append(' <dt>%s\n <dd>%s\n' % (opt, desc))
|
|
|
|
|
|
# close lists if indent level of next block is lower
|
|
|
if listnest:
|
|
|
start, level = listnest[-1]
|
|
|
if pos == len(blocks) - 1:
|
|
|
out.append('</%s>\n' % start)
|
|
|
listnest.pop()
|
|
|
else:
|
|
|
nb = blocks[pos + 1]
|
|
|
ni = nb['indent']
|
|
|
if (ni < level or
|
|
|
(ni == level and
|
|
|
nb['type'] not in 'definition bullet field option')):
|
|
|
out.append('</%s>\n' % start)
|
|
|
listnest.pop()
|
|
|
|
|
|
return ''.join(out)
|
|
|
|
|
|
def parse(text, indent=0, keep=None):
|
|
|
"""Parse text into a list of blocks"""
|
|
|
pruned = []
|
|
|
blocks = findblocks(text)
|
|
|
for b in blocks:
|
|
|
b['indent'] += indent
|
|
|
blocks = findliteralblocks(blocks)
|
|
|
blocks = findtables(blocks)
|
|
|
blocks, pruned = prunecontainers(blocks, keep or [])
|
|
|
blocks = findsections(blocks)
|
|
|
blocks = inlineliterals(blocks)
|
|
|
blocks = hgrole(blocks)
|
|
|
blocks = splitparagraphs(blocks)
|
|
|
blocks = updatefieldlists(blocks)
|
|
|
blocks = updateoptionlists(blocks)
|
|
|
blocks = addmargins(blocks)
|
|
|
blocks = prunecomments(blocks)
|
|
|
blocks = findadmonitions(blocks)
|
|
|
return blocks, pruned
|
|
|
|
|
|
def formatblocks(blocks, width):
|
|
|
text = ''.join(formatblock(b, width) for b in blocks)
|
|
|
return text
|
|
|
|
|
|
def format(text, width=80, indent=0, keep=None, style='plain'):
|
|
|
"""Parse and format the text according to width."""
|
|
|
blocks, pruned = parse(text, indent, keep or [])
|
|
|
if style == 'html':
|
|
|
text = formathtml(blocks)
|
|
|
else:
|
|
|
text = ''.join(formatblock(b, width) for b in blocks)
|
|
|
if keep is None:
|
|
|
return text
|
|
|
else:
|
|
|
return text, pruned
|
|
|
|
|
|
def getsections(blocks):
|
|
|
'''return a list of (section name, nesting level, blocks) tuples'''
|
|
|
nest = ""
|
|
|
level = 0
|
|
|
secs = []
|
|
|
for b in blocks:
|
|
|
if b['type'] == 'section':
|
|
|
i = b['underline']
|
|
|
if i not in nest:
|
|
|
nest += i
|
|
|
level = nest.index(i) + 1
|
|
|
nest = nest[:level]
|
|
|
secs.append((b['lines'][0], level, [b]))
|
|
|
else:
|
|
|
if not secs:
|
|
|
# add an initial empty section
|
|
|
secs = [('', 0, [])]
|
|
|
secs[-1][2].append(b)
|
|
|
return secs
|
|
|
|
|
|
def decorateblocks(blocks, width):
|
|
|
'''generate a list of (section name, line text) pairs for search'''
|
|
|
lines = []
|
|
|
for s in getsections(blocks):
|
|
|
section = s[0]
|
|
|
text = formatblocks(s[2], width)
|
|
|
lines.append([(section, l) for l in text.splitlines(True)])
|
|
|
return lines
|
|
|
|
|
|
def maketable(data, indent=0, header=False):
|
|
|
'''Generate an RST table for the given table data as a list of lines'''
|
|
|
|
|
|
widths = [max(encoding.colwidth(e) for e in c) for c in zip(*data)]
|
|
|
indent = ' ' * indent
|
|
|
div = indent + ' '.join('=' * w for w in widths) + '\n'
|
|
|
|
|
|
out = [div]
|
|
|
for row in data:
|
|
|
l = []
|
|
|
for w, v in zip(widths, row):
|
|
|
pad = ' ' * (w - encoding.colwidth(v))
|
|
|
l.append(v + pad)
|
|
|
out.append(indent + ' '.join(l) + "\n")
|
|
|
if header and len(data) > 1:
|
|
|
out.insert(2, div)
|
|
|
out.append(div)
|
|
|
return out
|
|
|
|
