| #!/usr/bin/env python |
| # A tool to parse ASTMatchers.h and update the documentation in |
| # ../LibASTMatchersReference.html automatically. Run from the |
| # directory in which this file is located to update the docs. |
| |
| import collections |
| import re |
| import urllib2 |
| |
| MATCHERS_FILE = '../../include/clang/ASTMatchers/ASTMatchers.h' |
| |
| # Each matcher is documented in one row of the form: |
| # result | name | argA |
| # The subsequent row contains the documentation and is hidden by default, |
| # becoming visible via javascript when the user clicks the matcher name. |
| TD_TEMPLATE=""" |
| <tr><td>%(result)s</td><td class="name" onclick="toggle('%(id)s')"><a name="%(id)sAnchor">%(name)s</a></td><td>%(args)s</td></tr> |
| <tr><td colspan="4" class="doc" id="%(id)s"><pre>%(comment)s</pre></td></tr> |
| """ |
| |
| # We categorize the matchers into these three categories in the reference: |
| node_matchers = {} |
| narrowing_matchers = {} |
| traversal_matchers = {} |
| |
| # We output multiple rows per matcher if the matcher can be used on multiple |
| # node types. Thus, we need a new id per row to control the documentation |
| # pop-up. ids[name] keeps track of those ids. |
| ids = collections.defaultdict(int) |
| |
| # Cache for doxygen urls we have already verified. |
| doxygen_probes = {} |
| |
| def esc(text): |
| """Escape any html in the given text.""" |
| text = re.sub(r'&', '&', text) |
| text = re.sub(r'<', '<', text) |
| text = re.sub(r'>', '>', text) |
| def link_if_exists(m): |
| name = m.group(1) |
| url = 'http://clang.llvm.org/doxygen/classclang_1_1%s.html' % name |
| if url not in doxygen_probes: |
| try: |
| print 'Probing %s...' % url |
| urllib2.urlopen(url) |
| doxygen_probes[url] = True |
| except: |
| doxygen_probes[url] = False |
| if doxygen_probes[url]: |
| return r'Matcher<<a href="%s">%s</a>>' % (url, name) |
| else: |
| return m.group(0) |
| text = re.sub( |
| r'Matcher<([^\*&]+)>', link_if_exists, text) |
| return text |
| |
| def extract_result_types(comment): |
| """Extracts a list of result types from the given comment. |
| |
| We allow annotations in the comment of the matcher to specify what |
| nodes a matcher can match on. Those comments have the form: |
| Usable as: Any Matcher | (Matcher<T1>[, Matcher<t2>[, ...]]) |
| |
| Returns ['*'] in case of 'Any Matcher', or ['T1', 'T2', ...]. |
| Returns the empty list if no 'Usable as' specification could be |
| parsed. |
| """ |
| result_types = [] |
| m = re.search(r'Usable as: Any Matcher[\s\n]*$', comment, re.S) |
| if m: |
| return ['*'] |
| while True: |
| m = re.match(r'^(.*)Matcher<([^>]+)>\s*,?[\s\n]*$', comment, re.S) |
| if not m: |
| if re.search(r'Usable as:\s*$', comment): |
| return result_types |
| else: |
| return None |
| result_types += [m.group(2)] |
| comment = m.group(1) |
| |
| def strip_doxygen(comment): |
| """Returns the given comment without \-escaped words.""" |
| # If there is only a doxygen keyword in the line, delete the whole line. |
| comment = re.sub(r'^\\[^\s]+\n', r'', comment, flags=re.M) |
| # Delete the doxygen command and the following whitespace. |
| comment = re.sub(r'\\[^\s]+\s+', r'', comment) |
| return comment |
| |
| def unify_arguments(args): |
| """Gets rid of anything the user doesn't care about in the argument list.""" |
| args = re.sub(r'internal::', r'', args) |
| args = re.sub(r'const\s+', r'', args) |
| args = re.sub(r'&', r' ', args) |
| args = re.sub(r'(^|\s)M\d?(\s)', r'\1Matcher<*>\2', args) |
| return args |
| |
| def add_matcher(result_type, name, args, comment, is_dyncast=False): |
| """Adds a matcher to one of our categories.""" |
| if name == 'id': |
| # FIXME: Figure out whether we want to support the 'id' matcher. |
| return |
| matcher_id = '%s%d' % (name, ids[name]) |
| ids[name] += 1 |
| args = unify_arguments(args) |
| matcher_html = TD_TEMPLATE % { |
| 'result': esc('Matcher<%s>' % result_type), |
| 'name': name, |
| 'args': esc(args), |
| 'comment': esc(strip_doxygen(comment)), |
| 'id': matcher_id, |
| } |
| if is_dyncast: |
| node_matchers[result_type + name] = matcher_html |
| # Use a heuristic to figure out whether a matcher is a narrowing or |
| # traversal matcher. By default, matchers that take other matchers as |
| # arguments (and are not node matchers) do traversal. We specifically |
| # exclude known narrowing matchers that also take other matchers as |
| # arguments. |
| elif ('Matcher<' not in args or |
| name in ['allOf', 'anyOf', 'anything', 'unless']): |
| narrowing_matchers[result_type + name] = matcher_html |
| else: |
| traversal_matchers[result_type + name] = matcher_html |
| |
| def act_on_decl(declaration, comment, allowed_types): |
| """Parse the matcher out of the given declaration and comment. |
| |
| If 'allowed_types' is set, it contains a list of node types the matcher |
| can match on, as extracted from the static type asserts in the matcher |
| definition. |
| """ |
| if declaration.strip(): |
| # Node matchers are defined by writing: |
| # VariadicDynCastAllOfMatcher<ResultType, ArgumentType> name; |
| m = re.match(r""".*Variadic(?:DynCast)?AllOfMatcher\s*< |
| \s*([^\s,]+)\s*(?:, |
| \s*([^\s>]+)\s*)?> |
| \s*([^\s;]+)\s*;\s*$""", declaration, flags=re.X) |
| if m: |
| result, inner, name = m.groups() |
| if not inner: |
| inner = result |
| add_matcher(result, name, 'Matcher<%s>...' % inner, |
| comment, is_dyncast=True) |
| return |
| |
| # Parse the various matcher definition macros. |
| m = re.match(""".*AST_TYPE_MATCHER\( |
| \s*([^\s,]+\s*), |
| \s*([^\s,]+\s*) |
| \)\s*;\s*$""", declaration, flags=re.X) |
| if m: |
| inner, name = m.groups() |
| add_matcher('Type', name, 'Matcher<%s>...' % inner, |
| comment, is_dyncast=True) |
| add_matcher('TypeLoc', '%sLoc' % name, 'Matcher<%sLoc>...' % inner, |
| comment, is_dyncast=True) |
| return |
| |
| m = re.match(""".*AST_TYPE(LOC)?_TRAVERSE_MATCHER\( |
| \s*([^\s,]+\s*), |
| \s*(?:[^\s,]+\s*) |
| \)\s*;\s*$""", declaration, flags=re.X) |
| if m: |
| loc = m.group(1) |
| name = m.group(2) |
| result_types = extract_result_types(comment) |
| if not result_types: |
| raise Exception('Did not find allowed result types for: %s' % name) |
| for result_type in result_types: |
| add_matcher(result_type, name, 'Matcher<Type>', comment) |
| if loc: |
| add_matcher('%sLoc' % result_type, '%sLoc' % name, 'Matcher<TypeLoc>', |
| comment) |
| return |
| |
| m = re.match(r"""^\s*AST_(POLYMORPHIC_)?MATCHER(_P)?(.?)(?:_OVERLOAD)?\( |
| (?:\s*([^\s,]+)\s*,)? |
| \s*([^\s,]+)\s* |
| (?:,\s*([^\s,]+)\s* |
| ,\s*([^\s,]+)\s*)? |
| (?:,\s*([^\s,]+)\s* |
| ,\s*([^\s,]+)\s*)? |
| (?:,\s*\d+\s*)? |
| \)\s*{\s*$""", declaration, flags=re.X) |
| if m: |
| p, n, result, name = m.groups()[1:5] |
| args = m.groups()[5:] |
| if not result: |
| if not allowed_types: |
| raise Exception('Did not find allowed result types for: %s' % name) |
| result_types = allowed_types |
| else: |
| result_types = [result] |
| if n not in ['', '2']: |
| raise Exception('Cannot parse "%s"' % declaration) |
| args = ', '.join('%s %s' % (args[i], args[i+1]) |
| for i in range(0, len(args), 2) if args[i]) |
| for result_type in result_types: |
| add_matcher(result_type, name, args, comment) |
| return |
| |
| # Parse free standing matcher functions, like: |
| # Matcher<ResultType> Name(Matcher<ArgumentType> InnerMatcher) { |
| m = re.match(r"""^\s*(.*)\s+ |
| ([^\s\(]+)\s*\( |
| (.*) |
| \)\s*{""", declaration, re.X) |
| if m: |
| result, name, args = m.groups() |
| args = ', '.join(p.strip() for p in args.split(',')) |
| m = re.match(r'.*\s+internal::(Bindable)?Matcher<([^>]+)>$', result) |
| if m: |
| result_types = [m.group(2)] |
| else: |
| result_types = extract_result_types(comment) |
| if not result_types: |
| if not comment: |
| # Only overloads don't have their own doxygen comments; ignore those. |
| print 'Ignoring "%s"' % name |
| else: |
| print 'Cannot determine result type for "%s"' % name |
| else: |
| for result_type in result_types: |
| add_matcher(result_type, name, args, comment) |
| else: |
| print '*** Unparsable: "' + declaration + '" ***' |
| |
| def sort_table(matcher_type, matcher_map): |
| """Returns the sorted html table for the given row map.""" |
| table = '' |
| for key in sorted(matcher_map.keys()): |
| table += matcher_map[key] + '\n' |
| return ('<!-- START_%(type)s_MATCHERS -->\n' + |
| '%(table)s' + |
| '<!--END_%(type)s_MATCHERS -->') % { |
| 'type': matcher_type, |
| 'table': table, |
| } |
| |
| # Parse the ast matchers. |
| # We alternate between two modes: |
| # body = True: We parse the definition of a matcher. We need |
| # to parse the full definition before adding a matcher, as the |
| # definition might contain static asserts that specify the result |
| # type. |
| # body = False: We parse the comments and declaration of the matcher. |
| comment = '' |
| declaration = '' |
| allowed_types = [] |
| body = False |
| for line in open(MATCHERS_FILE).read().splitlines(): |
| if body: |
| if line.strip() and line[0] == '}': |
| if declaration: |
| act_on_decl(declaration, comment, allowed_types) |
| comment = '' |
| declaration = '' |
| allowed_types = [] |
| body = False |
| else: |
| m = re.search(r'is_base_of<([^,]+), NodeType>', line) |
| if m and m.group(1): |
| allowed_types += [m.group(1)] |
| continue |
| if line.strip() and line.lstrip()[0] == '/': |
| comment += re.sub(r'/+\s?', '', line) + '\n' |
| else: |
| declaration += ' ' + line |
| if ((not line.strip()) or |
| line.rstrip()[-1] == ';' or |
| line.rstrip()[-1] == '{'): |
| if line.strip() and line.rstrip()[-1] == '{': |
| body = True |
| else: |
| act_on_decl(declaration, comment, allowed_types) |
| comment = '' |
| declaration = '' |
| allowed_types = [] |
| |
| node_matcher_table = sort_table('DECL', node_matchers) |
| narrowing_matcher_table = sort_table('NARROWING', narrowing_matchers) |
| traversal_matcher_table = sort_table('TRAVERSAL', traversal_matchers) |
| |
| reference = open('../LibASTMatchersReference.html').read() |
| reference = re.sub(r'<!-- START_DECL_MATCHERS.*END_DECL_MATCHERS -->', |
| '%s', reference, flags=re.S) % node_matcher_table |
| reference = re.sub(r'<!-- START_NARROWING_MATCHERS.*END_NARROWING_MATCHERS -->', |
| '%s', reference, flags=re.S) % narrowing_matcher_table |
| reference = re.sub(r'<!-- START_TRAVERSAL_MATCHERS.*END_TRAVERSAL_MATCHERS -->', |
| '%s', reference, flags=re.S) % traversal_matcher_table |
| |
| with open('../LibASTMatchersReference.html', 'w') as output: |
| output.write(reference) |
| |
