forked from OSchip/llvm-project
346 lines
13 KiB
Python
346 lines
13 KiB
Python
#!/usr/bin/env python
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# A tool to parse ASTMatchers.h and update the documentation in
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# ../LibASTMatchersReference.html automatically. Run from the
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# directory in which this file is located to update the docs.
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import collections
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import re
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import urllib2
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MATCHERS_FILE = '../../include/clang/ASTMatchers/ASTMatchers.h'
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# Each matcher is documented in one row of the form:
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# result | name | argA
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# The subsequent row contains the documentation and is hidden by default,
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# becoming visible via javascript when the user clicks the matcher name.
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TD_TEMPLATE="""
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<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>
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<tr><td colspan="4" class="doc" id="%(id)s"><pre>%(comment)s</pre></td></tr>
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"""
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# We categorize the matchers into these three categories in the reference:
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node_matchers = {}
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narrowing_matchers = {}
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traversal_matchers = {}
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# We output multiple rows per matcher if the matcher can be used on multiple
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# node types. Thus, we need a new id per row to control the documentation
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# pop-up. ids[name] keeps track of those ids.
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ids = collections.defaultdict(int)
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# Cache for doxygen urls we have already verified.
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doxygen_probes = {}
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def esc(text):
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"""Escape any html in the given text."""
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text = re.sub(r'&', '&', text)
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text = re.sub(r'<', '<', text)
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text = re.sub(r'>', '>', text)
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def link_if_exists(m):
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name = m.group(1)
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url = 'http://clang.llvm.org/doxygen/classclang_1_1%s.html' % name
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if url not in doxygen_probes:
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try:
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print 'Probing %s...' % url
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urllib2.urlopen(url)
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doxygen_probes[url] = True
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except:
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doxygen_probes[url] = False
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if doxygen_probes[url]:
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return r'Matcher<<a href="%s">%s</a>>' % (url, name)
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else:
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return m.group(0)
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text = re.sub(
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r'Matcher<([^\*&]+)>', link_if_exists, text)
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return text
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def extract_result_types(comment):
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"""Extracts a list of result types from the given comment.
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We allow annotations in the comment of the matcher to specify what
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nodes a matcher can match on. Those comments have the form:
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Usable as: Any Matcher | (Matcher<T1>[, Matcher<t2>[, ...]])
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Returns ['*'] in case of 'Any Matcher', or ['T1', 'T2', ...].
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Returns the empty list if no 'Usable as' specification could be
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parsed.
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"""
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result_types = []
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m = re.search(r'Usable as: Any Matcher[\s\n]*$', comment, re.S)
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if m:
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return ['*']
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while True:
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m = re.match(r'^(.*)Matcher<([^>]+)>\s*,?[\s\n]*$', comment, re.S)
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if not m:
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if re.search(r'Usable as:\s*$', comment):
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return result_types
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else:
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return None
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result_types += [m.group(2)]
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comment = m.group(1)
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def strip_doxygen(comment):
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"""Returns the given comment without \-escaped words."""
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# If there is only a doxygen keyword in the line, delete the whole line.
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comment = re.sub(r'^\\[^\s]+\n', r'', comment, flags=re.M)
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# Delete the doxygen command and the following whitespace.
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comment = re.sub(r'\\[^\s]+\s+', r'', comment)
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return comment
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def unify_arguments(args):
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"""Gets rid of anything the user doesn't care about in the argument list."""
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args = re.sub(r'internal::', r'', args)
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args = re.sub(r'const\s+', r'', args)
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args = re.sub(r'&', r' ', args)
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args = re.sub(r'(^|\s)M\d?(\s)', r'\1Matcher<*>\2', args)
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return args
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def add_matcher(result_type, name, args, comment, is_dyncast=False):
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"""Adds a matcher to one of our categories."""
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if name == 'id':
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# FIXME: Figure out whether we want to support the 'id' matcher.
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return
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matcher_id = '%s%d' % (name, ids[name])
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ids[name] += 1
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args = unify_arguments(args)
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matcher_html = TD_TEMPLATE % {
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'result': esc('Matcher<%s>' % result_type),
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'name': name,
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'args': esc(args),
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'comment': esc(strip_doxygen(comment)),
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'id': matcher_id,
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}
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if is_dyncast:
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node_matchers[result_type + name] = matcher_html
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# Use a heuristic to figure out whether a matcher is a narrowing or
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# traversal matcher. By default, matchers that take other matchers as
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# arguments (and are not node matchers) do traversal. We specifically
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# exclude known narrowing matchers that also take other matchers as
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# arguments.
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elif ('Matcher<' not in args or
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name in ['allOf', 'anyOf', 'anything', 'unless']):
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narrowing_matchers[result_type + name] = matcher_html
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else:
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traversal_matchers[result_type + name] = matcher_html
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def act_on_decl(declaration, comment, allowed_types):
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"""Parse the matcher out of the given declaration and comment.
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If 'allowed_types' is set, it contains a list of node types the matcher
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can match on, as extracted from the static type asserts in the matcher
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definition.
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"""
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if declaration.strip():
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# Node matchers are defined by writing:
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# VariadicDynCastAllOfMatcher<ResultType, ArgumentType> name;
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m = re.match(r""".*Variadic(?:DynCast)?AllOfMatcher\s*<
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\s*([^\s,]+)\s*(?:,
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\s*([^\s>]+)\s*)?>
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\s*([^\s;]+)\s*;\s*$""", declaration, flags=re.X)
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if m:
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result, inner, name = m.groups()
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if not inner:
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inner = result
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add_matcher(result, name, 'Matcher<%s>...' % inner,
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comment, is_dyncast=True)
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return
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# Parse the various matcher definition macros.
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m = re.match(""".*AST_TYPE_MATCHER\(
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\s*([^\s,]+\s*),
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\s*([^\s,]+\s*)
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\)\s*;\s*$""", declaration, flags=re.X)
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if m:
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inner, name = m.groups()
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add_matcher('Type', name, 'Matcher<%s>...' % inner,
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comment, is_dyncast=True)
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# FIXME: re-enable once we have implemented casting on the TypeLoc
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# hierarchy.
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# add_matcher('TypeLoc', '%sLoc' % name, 'Matcher<%sLoc>...' % inner,
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# comment, is_dyncast=True)
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return
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m = re.match(""".*AST_TYPE(LOC)?_TRAVERSE_MATCHER\(
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\s*([^\s,]+\s*),
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\s*(?:[^\s,]+\s*),
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\s*AST_POLYMORPHIC_SUPPORTED_TYPES_([^(]*)\(([^)]*)\)
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\)\s*;\s*$""", declaration, flags=re.X)
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if m:
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loc, name, n_results, results = m.groups()[0:4]
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result_types = [r.strip() for r in results.split(',')]
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comment_result_types = extract_result_types(comment)
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if (comment_result_types and
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sorted(result_types) != sorted(comment_result_types)):
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raise Exception('Inconsistent documentation for: %s' % name)
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for result_type in result_types:
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add_matcher(result_type, name, 'Matcher<Type>', comment)
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if loc:
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add_matcher('%sLoc' % result_type, '%sLoc' % name, 'Matcher<TypeLoc>',
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comment)
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return
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m = re.match(r"""^\s*AST_POLYMORPHIC_MATCHER(_P)?(.?)(?:_OVERLOAD)?\(
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\s*([^\s,]+)\s*,
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\s*AST_POLYMORPHIC_SUPPORTED_TYPES_([^(]*)\(([^)]*)\)
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(?:,\s*([^\s,]+)\s*
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,\s*([^\s,]+)\s*)?
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(?:,\s*([^\s,]+)\s*
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,\s*([^\s,]+)\s*)?
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(?:,\s*\d+\s*)?
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\)\s*{\s*$""", declaration, flags=re.X)
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if m:
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p, n, name, n_results, results = m.groups()[0:5]
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args = m.groups()[5:]
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result_types = [r.strip() for r in results.split(',')]
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if allowed_types and allowed_types != result_types:
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raise Exception('Inconsistent documentation for: %s' % name)
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if n not in ['', '2']:
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raise Exception('Cannot parse "%s"' % declaration)
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args = ', '.join('%s %s' % (args[i], args[i+1])
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for i in range(0, len(args), 2) if args[i])
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for result_type in result_types:
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add_matcher(result_type, name, args, comment)
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return
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m = re.match(r"""^\s*AST_MATCHER(_P)?(.?)(?:_OVERLOAD)?\(
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(?:\s*([^\s,]+)\s*,)?
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\s*([^\s,]+)\s*
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(?:,\s*([^\s,]+)\s*
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,\s*([^\s,]+)\s*)?
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(?:,\s*([^\s,]+)\s*
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,\s*([^\s,]+)\s*)?
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(?:,\s*\d+\s*)?
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\)\s*{\s*$""", declaration, flags=re.X)
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if m:
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p, n, result, name = m.groups()[0:4]
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args = m.groups()[4:]
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if not result:
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if not allowed_types:
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raise Exception('Did not find allowed result types for: %s' % name)
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result_types = allowed_types
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else:
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result_types = [result]
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if n not in ['', '2']:
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raise Exception('Cannot parse "%s"' % declaration)
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args = ', '.join('%s %s' % (args[i], args[i+1])
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for i in range(0, len(args), 2) if args[i])
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for result_type in result_types:
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add_matcher(result_type, name, args, comment)
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return
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# Parse ArgumentAdapting matchers.
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m = re.match(
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r"""^.*ArgumentAdaptingMatcherFunc<.*>\s*(?:LLVM_ATTRIBUTE_UNUSED\s*)
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([a-zA-Z]*)\s*=\s*{};$""",
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declaration, flags=re.X)
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if m:
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name = m.groups()[0]
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add_matcher('*', name, 'Matcher<*>', comment)
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return
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# Parse Variadic operator matchers.
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m = re.match(
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r"""^.*VariadicOperatorMatcherFunc\s*([a-zA-Z]*)\s*=\s*{.*};$""",
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declaration, flags=re.X)
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if m:
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name = m.groups()[0]
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add_matcher('*', name, 'Matcher<*>, ..., Matcher<*>', comment)
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return
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# Parse free standing matcher functions, like:
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# Matcher<ResultType> Name(Matcher<ArgumentType> InnerMatcher) {
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m = re.match(r"""^\s*(.*)\s+
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([^\s\(]+)\s*\(
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(.*)
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\)\s*{""", declaration, re.X)
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if m:
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result, name, args = m.groups()
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args = ', '.join(p.strip() for p in args.split(','))
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m = re.match(r'.*\s+internal::(Bindable)?Matcher<([^>]+)>$', result)
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if m:
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result_types = [m.group(2)]
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else:
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result_types = extract_result_types(comment)
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if not result_types:
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if not comment:
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# Only overloads don't have their own doxygen comments; ignore those.
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print 'Ignoring "%s"' % name
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else:
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print 'Cannot determine result type for "%s"' % name
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else:
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for result_type in result_types:
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add_matcher(result_type, name, args, comment)
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else:
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print '*** Unparsable: "' + declaration + '" ***'
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def sort_table(matcher_type, matcher_map):
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"""Returns the sorted html table for the given row map."""
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table = ''
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for key in sorted(matcher_map.keys()):
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table += matcher_map[key] + '\n'
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return ('<!-- START_%(type)s_MATCHERS -->\n' +
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'%(table)s' +
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'<!--END_%(type)s_MATCHERS -->') % {
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'type': matcher_type,
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'table': table,
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}
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# Parse the ast matchers.
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# We alternate between two modes:
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# body = True: We parse the definition of a matcher. We need
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# to parse the full definition before adding a matcher, as the
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# definition might contain static asserts that specify the result
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# type.
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# body = False: We parse the comments and declaration of the matcher.
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comment = ''
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declaration = ''
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allowed_types = []
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body = False
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for line in open(MATCHERS_FILE).read().splitlines():
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if body:
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if line.strip() and line[0] == '}':
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if declaration:
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act_on_decl(declaration, comment, allowed_types)
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comment = ''
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declaration = ''
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allowed_types = []
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body = False
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else:
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m = re.search(r'is_base_of<([^,]+), NodeType>', line)
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if m and m.group(1):
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allowed_types += [m.group(1)]
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continue
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if line.strip() and line.lstrip()[0] == '/':
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comment += re.sub(r'/+\s?', '', line) + '\n'
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else:
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declaration += ' ' + line
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if ((not line.strip()) or
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line.rstrip()[-1] == ';' or
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(line.rstrip()[-1] == '{' and line.rstrip()[-3:] != '= {')):
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if line.strip() and line.rstrip()[-1] == '{':
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body = True
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else:
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act_on_decl(declaration, comment, allowed_types)
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comment = ''
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declaration = ''
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allowed_types = []
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node_matcher_table = sort_table('DECL', node_matchers)
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narrowing_matcher_table = sort_table('NARROWING', narrowing_matchers)
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traversal_matcher_table = sort_table('TRAVERSAL', traversal_matchers)
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reference = open('../LibASTMatchersReference.html').read()
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reference = re.sub(r'<!-- START_DECL_MATCHERS.*END_DECL_MATCHERS -->',
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'%s', reference, flags=re.S) % node_matcher_table
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reference = re.sub(r'<!-- START_NARROWING_MATCHERS.*END_NARROWING_MATCHERS -->',
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'%s', reference, flags=re.S) % narrowing_matcher_table
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reference = re.sub(r'<!-- START_TRAVERSAL_MATCHERS.*END_TRAVERSAL_MATCHERS -->',
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'%s', reference, flags=re.S) % traversal_matcher_table
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with open('../LibASTMatchersReference.html', 'w') as output:
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output.write(reference)
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