1#!/usr/bin/env python
2# A tool to parse the FormatStyle struct from Format.h and update the
3# documentation in ../ClangFormatStyleOptions.rst automatically.
4# Run from the directory in which this file is located to update the docs.
5
6import collections
7import os
8import re
9import urllib2
10
11CLANG_DIR = os.path.join(os.path.dirname(__file__), '../..')
12FORMAT_STYLE_FILE = os.path.join(CLANG_DIR, 'include/clang/Format/Format.h')
13DOC_FILE = os.path.join(CLANG_DIR, 'docs/ClangFormatStyleOptions.rst')
14
15
16def substitute(text, tag, contents):
17  replacement = '\n.. START_%s\n\n%s\n\n.. END_%s\n' % (tag, contents, tag)
18  pattern = r'\n\.\. START_%s\n.*\n\.\. END_%s\n' % (tag, tag)
19  return re.sub(pattern, '%s', text, flags=re.S) % replacement
20
21def doxygen2rst(text):
22  text = re.sub(r'<tt>\s*(.*?)\s*<\/tt>', r'``\1``', text)
23  text = re.sub(r'\\c ([^ ,;\.]+)', r'``\1``', text)
24  text = re.sub(r'\\\w+ ', '', text)
25  return text
26
27def indent(text, columns, indent_first_line=True):
28  indent = ' ' * columns
29  s = re.sub(r'\n([^\n])', '\n' + indent + '\\1', text, flags=re.S)
30  if not indent_first_line or s.startswith('\n'):
31    return s
32  return indent + s
33
34class Option:
35  def __init__(self, name, type, comment):
36    self.name = name
37    self.type = type
38    self.comment = comment.strip()
39    self.enum = None
40    self.nested_struct = None
41
42  def __str__(self):
43    s = '**%s** (``%s``)\n%s' % (self.name, self.type,
44                                 doxygen2rst(indent(self.comment, 2)))
45    if self.enum:
46      s += indent('\n\nPossible values:\n\n%s\n' % self.enum, 2)
47    if self.nested_struct:
48      s += indent('\n\nNested configuration flags:\n\n%s\n' %self.nested_struct,
49                  2)
50    return s
51
52class NestedStruct:
53  def __init__(self, name, comment):
54    self.name = name
55    self.comment = comment.strip()
56    self.values = []
57
58  def __str__(self):
59    return '\n'.join(map(str, self.values))
60
61class NestedField:
62  def __init__(self, name, comment):
63    self.name = name
64    self.comment = comment.strip()
65
66  def __str__(self):
67    return '\n* ``%s`` %s' % (
68        self.name,
69        doxygen2rst(indent(self.comment, 2, indent_first_line=False)))
70
71class Enum:
72  def __init__(self, name, comment):
73    self.name = name
74    self.comment = comment.strip()
75    self.values = []
76
77  def __str__(self):
78    return '\n'.join(map(str, self.values))
79
80class EnumValue:
81  def __init__(self, name, comment):
82    self.name = name
83    self.comment = comment
84
85  def __str__(self):
86    return '* ``%s`` (in configuration: ``%s``)\n%s' % (
87        self.name,
88        re.sub('.*_', '', self.name),
89        doxygen2rst(indent(self.comment, 2)))
90
91def clean_comment_line(line):
92  match = re.match(r'^/// \\code(\{.(\w+)\})?$', line)
93  if match:
94    lang = match.groups()[1]
95    if not lang:
96      lang = 'c++'
97    return '\n.. code-block:: %s\n\n' % lang
98  if line == '/// \\endcode':
99    return ''
100  return line[4:] + '\n'
101
102def read_options(header):
103  class State:
104    BeforeStruct, Finished, InStruct, InNestedStruct, InNestedFieldComent, \
105    InFieldComment, InEnum, InEnumMemberComment = range(8)
106  state = State.BeforeStruct
107
108  options = []
109  enums = {}
110  nested_structs = {}
111  comment = ''
112  enum = None
113  nested_struct = None
114
115  for line in header:
116    line = line.strip()
117    if state == State.BeforeStruct:
118      if line == 'struct FormatStyle {':
119        state = State.InStruct
120    elif state == State.InStruct:
121      if line.startswith('///'):
122        state = State.InFieldComment
123        comment = clean_comment_line(line)
124      elif line == '};':
125        state = State.Finished
126        break
127    elif state == State.InFieldComment:
128      if line.startswith('///'):
129        comment += clean_comment_line(line)
130      elif line.startswith('enum'):
131        state = State.InEnum
132        name = re.sub(r'enum\s+(\w+)\s*\{', '\\1', line)
133        enum = Enum(name, comment)
134      elif line.startswith('struct'):
135        state = State.InNestedStruct
136        name = re.sub(r'struct\s+(\w+)\s*\{', '\\1', line)
137        nested_struct = NestedStruct(name, comment)
138      elif line.endswith(';'):
139        state = State.InStruct
140        field_type, field_name = re.match(r'([<>:\w(,\s)]+)\s+(\w+);',
141                                          line).groups()
142        option = Option(str(field_name), str(field_type), comment)
143        options.append(option)
144      else:
145        raise Exception('Invalid format, expected comment, field or enum')
146    elif state == State.InNestedStruct:
147      if line.startswith('///'):
148        state = State.InNestedFieldComent
149        comment = clean_comment_line(line)
150      elif line == '};':
151        state = State.InStruct
152        nested_structs[nested_struct.name] = nested_struct
153    elif state == State.InNestedFieldComent:
154      if line.startswith('///'):
155        comment += clean_comment_line(line)
156      else:
157        state = State.InNestedStruct
158        nested_struct.values.append(NestedField(line.replace(';', ''), comment))
159    elif state == State.InEnum:
160      if line.startswith('///'):
161        state = State.InEnumMemberComment
162        comment = clean_comment_line(line)
163      elif line == '};':
164        state = State.InStruct
165        enums[enum.name] = enum
166      else:
167        raise Exception('Invalid format, expected enum field comment or };')
168    elif state == State.InEnumMemberComment:
169      if line.startswith('///'):
170        comment += clean_comment_line(line)
171      else:
172        state = State.InEnum
173        enum.values.append(EnumValue(line.replace(',', ''), comment))
174  if state != State.Finished:
175    raise Exception('Not finished by the end of file')
176
177  for option in options:
178    if not option.type in ['bool', 'unsigned', 'int', 'std::string',
179                           'std::vector<std::string>',
180                           'std::vector<IncludeCategory>',
181                           'std::vector<RawStringFormat>']:
182      if enums.has_key(option.type):
183        option.enum = enums[option.type]
184      elif nested_structs.has_key(option.type):
185        option.nested_struct = nested_structs[option.type]
186      else:
187        raise Exception('Unknown type: %s' % option.type)
188  return options
189
190options = read_options(open(FORMAT_STYLE_FILE))
191
192options = sorted(options, key=lambda x: x.name)
193options_text = '\n\n'.join(map(str, options))
194
195contents = open(DOC_FILE).read()
196
197contents = substitute(contents, 'FORMAT_STYLE_OPTIONS', options_text)
198
199with open(DOC_FILE, 'wb') as output:
200  output.write(contents)
201