Revert of Remove now obsolete checkdeps copy

tools/checkdeps/graphdeps.py

Index: tools/checkdeps/graphdeps.py
diff --git a/tools/checkdeps/graphdeps.py b/tools/checkdeps/graphdeps.py
new file mode 100755
index 0000000000000000000000000000000000000000..208772f05784b628722076be3d7e0a1e8242a710
--- /dev/null
+++ b/tools/checkdeps/graphdeps.py
@@ -0,0 +1,407 @@
+#!/usr/bin/env python
+# Copyright 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Dumps a graph of allowed and disallowed inter-module dependencies described
+by the DEPS files in the source tree. Supports DOT and PNG as the output format.
+
+Enables filtering and differential highlighting of parts of the graph based on
+the specified criteria. This allows for a much easier visual analysis of the
+dependencies, including answering questions such as "if a new source must
+depend on modules A, B, and C, what valid options among the existing modules
+are there to put it in."
+
+See builddeps.py for a detailed description of the DEPS format.
+"""
+
+import os
+import optparse
+import pipes
+import re
+import sys
+
+from builddeps import DepsBuilder
+from rules import Rule
+
+
+class DepsGrapher(DepsBuilder):
+  """Parses include_rules from DEPS files and outputs a DOT graph of the
+  allowed and disallowed dependencies between directories and specific file
+  regexps. Can generate only a subgraph of the whole dependency graph
+  corresponding to the provided inclusion and exclusion regexp filters.
+  Also can highlight fanins and/or fanouts of certain nodes matching the
+  provided regexp patterns.
+  """
+
+  def __init__(self,
+               base_directory,
+               verbose,
+               being_tested,
+               ignore_temp_rules,
+               ignore_specific_rules,
+               hide_disallowed_deps,
+               out_file,
+               out_format,
+               layout_engine,
+               unflatten_graph,
+               incl,
+               excl,
+               hilite_fanins,
+               hilite_fanouts):
+    """Creates a new DepsGrapher.
+
+    Args:
+      base_directory: OS-compatible path to root of checkout, e.g. C:\chr\src.
+      verbose: Set to true for debug output.
+      being_tested: Set to true to ignore the DEPS file at tools/graphdeps/DEPS.
+      ignore_temp_rules: Ignore rules that start with Rule.TEMP_ALLOW ("!").
+      ignore_specific_rules: Ignore rules from specific_include_rules sections.
+      hide_disallowed_deps: Hide disallowed dependencies from the output graph.
+      out_file: Output file name.
+      out_format: Output format (anything GraphViz dot's -T option supports).
+      layout_engine: Layout engine for formats other than 'dot'
+                     (anything that GraphViz dot's -K option supports).
+      unflatten_graph: Try to reformat the output graph so it is narrower and
+                       taller. Helps fight overly flat and wide graphs, but
+                       sometimes produces a worse result.
+      incl: Include only nodes matching this regexp; such nodes' fanin/fanout
+            is also included.
+      excl: Exclude nodes matching this regexp; such nodes' fanin/fanout is
+            processed independently.
+      hilite_fanins: Highlight fanins of nodes matching this regexp with a
+                     different edge and node color.
+      hilite_fanouts: Highlight fanouts of nodes matching this regexp with a
+                      different edge and node color.
+    """
+    DepsBuilder.__init__(
+        self,
+        base_directory,
+        verbose,
+        being_tested,
+        ignore_temp_rules,
+        ignore_specific_rules)
+
+    self.ignore_temp_rules = ignore_temp_rules
+    self.ignore_specific_rules = ignore_specific_rules
+    self.hide_disallowed_deps = hide_disallowed_deps
+    self.out_file = out_file
+    self.out_format = out_format
+    self.layout_engine = layout_engine
+    self.unflatten_graph = unflatten_graph
+    self.incl = incl
+    self.excl = excl
+    self.hilite_fanins = hilite_fanins
+    self.hilite_fanouts = hilite_fanouts
+
+    self.deps = set()
+
+  def DumpDependencies(self):
+    """ Builds a dependency rule table and dumps the corresponding dependency
+    graph to all requested formats."""
+    self._BuildDepsGraph(self.base_directory)
+    self._DumpDependencies()
+
+  def _BuildDepsGraph(self, full_path):
+    """Recursively traverses the source tree starting at the specified directory
+    and builds a dependency graph representation in self.deps."""
+    rel_path = os.path.relpath(full_path, self.base_directory)
+    #if re.search(self.incl, rel_path) and not re.search(self.excl, rel_path):
+    rules = self.GetDirectoryRules(full_path)
+    if rules:
+      deps = rules.AsDependencyTuples(
+          include_general_rules=True,
+          include_specific_rules=not self.ignore_specific_rules)
+      self.deps.update(deps)
+
+    for item in sorted(os.listdir(full_path)):
+      next_full_path = os.path.join(full_path, item)
+      if os.path.isdir(next_full_path):
+        self._BuildDepsGraph(next_full_path)
+
+  def _DumpDependencies(self):
+    """Dumps the built dependency graph to the specified file with specified
+    format."""
+    if self.out_format == 'dot' and not self.layout_engine:
+      if self.unflatten_graph:
+        pipe = pipes.Template()
+        pipe.append('unflatten -l 2 -c 3', '--')
+        out = pipe.open(self.out_file, 'w')
+      else:
+        out = open(self.out_file, 'w')
+    else:
+      pipe = pipes.Template()
+      if self.unflatten_graph:
+        pipe.append('unflatten -l 2 -c 3', '--')
+      dot_cmd = 'dot -T' + self.out_format
+      if self.layout_engine:
+        dot_cmd += ' -K' + self.layout_engine
+      pipe.append(dot_cmd, '--')
+      out = pipe.open(self.out_file, 'w')
+
+    self._DumpDependenciesImpl(self.deps, out)
+    out.close()
+
+  def _DumpDependenciesImpl(self, deps, out):
+    """Computes nodes' and edges' properties for the dependency graph |deps| and
+    carries out the actual dumping to a file/pipe |out|."""
+    deps_graph = dict()
+    deps_srcs = set()
+
+    # Pre-initialize the graph with src->(dst, allow) pairs.
+    for (allow, src, dst) in deps:
+      if allow == Rule.TEMP_ALLOW and self.ignore_temp_rules:
+        continue
+
+      deps_srcs.add(src)
+      if src not in deps_graph:
+        deps_graph[src] = []
+      deps_graph[src].append((dst, allow))
+
+      # Add all hierarchical parents too, in case some of them don't have their
+      # own DEPS, and therefore are missing from the list of rules. Those will
+      # be recursively populated with their parents' rules in the next block.
+      parent_src = os.path.dirname(src)
+      while parent_src:
+        if parent_src not in deps_graph:
+          deps_graph[parent_src] = []
+        parent_src = os.path.dirname(parent_src)
+
+    # For every node, propagate its rules down to all its children.
+    deps_srcs = list(deps_srcs)
+    deps_srcs.sort()
+    for src in deps_srcs:
+      parent_src = os.path.dirname(src)
+      if parent_src:
+        # We presort the list, so parents are guaranteed to precede children.
+        assert parent_src in deps_graph,\
+               "src: %s, parent_src: %s" % (src, parent_src)
+        for (dst, allow) in deps_graph[parent_src]:
+          # Check that this node does not explicitly override a rule from the
+          # parent that we're about to add.
+          if ((dst, Rule.ALLOW) not in deps_graph[src]) and \
+             ((dst, Rule.TEMP_ALLOW) not in deps_graph[src]) and \
+             ((dst, Rule.DISALLOW) not in deps_graph[src]):
+            deps_graph[src].append((dst, allow))
+
+    node_props = {}
+    edges = []
+
+    # 1) Populate a list of edge specifications in DOT format;
+    # 2) Populate a list of computed raw node attributes to be output as node
+    #    specifications in DOT format later on.
+    # Edges and nodes are emphasized with color and line/border weight depending
+    # on how many of incl/excl/hilite_fanins/hilite_fanouts filters they hit,
+    # and in what way.
+    for src in deps_graph.keys():
+      for (dst, allow) in deps_graph[src]:
+        if allow == Rule.DISALLOW and self.hide_disallowed_deps:
+          continue
+
+        if allow == Rule.ALLOW and src == dst:
+          continue
+
+        edge_spec = "%s->%s" % (src, dst)
+        if not re.search(self.incl, edge_spec) or \
+               re.search(self.excl, edge_spec):
+          continue
+
+        if src not in node_props:
+          node_props[src] = {'hilite': None, 'degree': 0}
+        if dst not in node_props:
+          node_props[dst] = {'hilite': None, 'degree': 0}
+
+        edge_weight = 1
+
+        if self.hilite_fanouts and re.search(self.hilite_fanouts, src):
+          node_props[src]['hilite'] = 'lightgreen'
+          node_props[dst]['hilite'] = 'lightblue'
+          node_props[dst]['degree'] += 1
+          edge_weight += 1
+
+        if self.hilite_fanins and re.search(self.hilite_fanins, dst):
+          node_props[src]['hilite'] = 'lightblue'
+          node_props[dst]['hilite'] = 'lightgreen'
+          node_props[src]['degree'] += 1
+          edge_weight += 1
+
+        if allow == Rule.ALLOW:
+          edge_color = (edge_weight > 1) and 'blue' or 'green'
+          edge_style = 'solid'
+        elif allow == Rule.TEMP_ALLOW:
+          edge_color = (edge_weight > 1) and 'blue' or 'green'
+          edge_style = 'dashed'
+        else:
+          edge_color = 'red'
+          edge_style = 'dashed'
+        edges.append('    "%s" -> "%s" [style=%s,color=%s,penwidth=%d];' % \
+            (src, dst, edge_style, edge_color, edge_weight))
+
+    # Reformat the computed raw node attributes into a final DOT representation.
+    nodes = []
+    for (node, attrs) in node_props.iteritems():
+      attr_strs = []
+      if attrs['hilite']:
+        attr_strs.append('style=filled,fillcolor=%s' % attrs['hilite'])
+      attr_strs.append('penwidth=%d' % (attrs['degree'] or 1))
+      nodes.append('    "%s" [%s];' % (node, ','.join(attr_strs)))
+
+    # Output nodes and edges to |out| (can be a file or a pipe).
+    edges.sort()
+    nodes.sort()
+    out.write('digraph DEPS {\n'
+              '    fontsize=8;\n')
+    out.write('\n'.join(nodes))
+    out.write('\n\n')
+    out.write('\n'.join(edges))
+    out.write('\n}\n')
+    out.close()
+
+
+def PrintUsage():
+  print """Usage: python graphdeps.py [--root <root>]
+
+  --root ROOT Specifies the repository root. This defaults to "../../.."
+              relative to the script file. This will be correct given the
+              normal location of the script in "<root>/tools/graphdeps".
+
+  --(others)  There are a few lesser-used options; run with --help to show them.
+
+Examples:
+  Dump the whole dependency graph:
+    graphdeps.py
+  Find a suitable place for a new source that must depend on /apps and
+  /content/browser/renderer_host. Limit potential candidates to /apps,
+  /chrome/browser and content/browser, and descendants of those three.
+  Generate both DOT and PNG output. The output will highlight the fanins
+  of /apps and /content/browser/renderer_host. Overlapping nodes in both fanins
+  will be emphasized by a thicker border. Those nodes are the ones that are
+  allowed to depend on both targets, therefore they are all legal candidates
+  to place the new source in:
+    graphdeps.py \
+      --root=./src \
+      --out=./DEPS.svg \
+      --format=svg \
+      --incl='^(apps|chrome/browser|content/browser)->.*' \
+      --excl='.*->third_party' \
+      --fanin='^(apps|content/browser/renderer_host)$' \
+      --ignore-specific-rules \
+      --ignore-temp-rules"""
+
+
+def main():
+  option_parser = optparse.OptionParser()
+  option_parser.add_option(
+      "", "--root",
+      default="", dest="base_directory",
+      help="Specifies the repository root. This defaults "
+           "to '../../..' relative to the script file, which "
+           "will normally be the repository root.")
+  option_parser.add_option(
+      "-f", "--format",
+      dest="out_format", default="dot",
+      help="Output file format. "
+           "Can be anything that GraphViz dot's -T option supports. "
+           "The most useful ones are: dot (text), svg (image), pdf (image)."
+           "NOTES: dotty has a known problem with fonts when displaying DOT "
+           "files on Ubuntu - if labels are unreadable, try other formats.")
+  option_parser.add_option(
+      "-o", "--out",
+      dest="out_file", default="DEPS",
+      help="Output file name. If the name does not end in an extension "
+           "matching the output format, that extension is automatically "
+           "appended.")
+  option_parser.add_option(
+      "-l", "--layout-engine",
+      dest="layout_engine", default="",
+      help="Layout rendering engine. "
+           "Can be anything that GraphViz dot's -K option supports. "
+           "The most useful are in decreasing order: dot, fdp, circo, osage. "
+           "NOTE: '-f dot' and '-f dot -l dot' are different: the former "
+           "will dump a raw DOT graph and stop; the latter will further "
+           "filter it through 'dot -Tdot -Kdot' layout engine.")
+  option_parser.add_option(
+      "-i", "--incl",
+      default="^.*$", dest="incl",
+      help="Include only edges of the graph that match the specified regexp. "
+           "The regexp is applied to edges of the graph formatted as "
+           "'source_node->target_node', where the '->' part is vebatim. "
+           "Therefore, a reliable regexp should look like "
+           "'^(chrome|chrome/browser|chrome/common)->content/public/browser$' "
+           "or similar, with both source and target node regexps present, "
+           "explicit ^ and $, and otherwise being as specific as possible.")
+  option_parser.add_option(
+      "-e", "--excl",
+      default="^$", dest="excl",
+      help="Exclude dependent nodes that match the specified regexp. "
+           "See --incl for details on the format.")
+  option_parser.add_option(
+      "", "--fanin",
+      default="", dest="hilite_fanins",
+      help="Highlight fanins of nodes matching the specified regexp.")
+  option_parser.add_option(
+      "", "--fanout",
+      default="", dest="hilite_fanouts",
+      help="Highlight fanouts of nodes matching the specified regexp.")
+  option_parser.add_option(
+      "", "--ignore-temp-rules",
+      action="store_true", dest="ignore_temp_rules", default=False,
+      help="Ignore !-prefixed (temporary) rules in DEPS files.")
+  option_parser.add_option(
+      "", "--ignore-specific-rules",
+      action="store_true", dest="ignore_specific_rules", default=False,
+      help="Ignore specific_include_rules section of DEPS files.")
+  option_parser.add_option(
+      "", "--hide-disallowed-deps",
+      action="store_true", dest="hide_disallowed_deps", default=False,
+      help="Hide disallowed dependencies in the output graph.")
+  option_parser.add_option(
+      "", "--unflatten",
+      action="store_true", dest="unflatten_graph", default=False,
+      help="Try to reformat the output graph so it is narrower and taller. "
+           "Helps fight overly flat and wide graphs, but sometimes produces "
+           "inferior results.")
+  option_parser.add_option(
+      "-v", "--verbose",
+      action="store_true", default=False,
+      help="Print debug logging")
+  options, args = option_parser.parse_args()
+
+  if not options.out_file.endswith(options.out_format):
+    options.out_file += '.' + options.out_format
+
+  deps_grapher = DepsGrapher(
+      base_directory=options.base_directory,
+      verbose=options.verbose,
+      being_tested=False,
+
+      ignore_temp_rules=options.ignore_temp_rules,
+      ignore_specific_rules=options.ignore_specific_rules,
+      hide_disallowed_deps=options.hide_disallowed_deps,
+
+      out_file=options.out_file,
+      out_format=options.out_format,
+      layout_engine=options.layout_engine,
+      unflatten_graph=options.unflatten_graph,
+
+      incl=options.incl,
+      excl=options.excl,
+      hilite_fanins=options.hilite_fanins,
+      hilite_fanouts=options.hilite_fanouts)
+
+  if len(args) > 0:
+    PrintUsage()
+    return 1
+
+  print 'Using base directory: ', deps_grapher.base_directory
+  print 'include nodes       : ', options.incl
+  print 'exclude nodes       : ', options.excl
+  print 'highlight fanins of : ', options.hilite_fanins
+  print 'highlight fanouts of: ', options.hilite_fanouts
+
+  deps_grapher.DumpDependencies()
+  return 0
+
+
+if '__main__' == __name__:
+  sys.exit(main())