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# Copyright 2012 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Nodes for PPAPI IDL AST."""
from __future__ import print_function
from idl_namespace import IDLNamespace
from idl_node import IDLNode
from idl_option import GetOption
from idl_visitor import IDLVisitor
from idl_release import IDLReleaseMap
#
# IDLLabelResolver
#
# A specialized visitor which traverses the AST, building a mapping of
# Release names to Versions numbers and calculating a min version.
# The mapping is applied to the File nodes within the AST.
#
class IDLLabelResolver(IDLVisitor):
def Depart(self, node, ignore, childdata):
# Build list of Release=Version
if node.IsA('LabelItem'):
channel = node.GetProperty('channel')
if not channel:
channel = 'stable'
return (node.GetName(), node.GetProperty('VALUE'), channel)
# On completion of the Label, apply to the parent File if the
# name of the label matches the generation label.
if node.IsA('Label') and node.GetName() == GetOption('label'):
try:
node.parent.release_map = IDLReleaseMap(childdata)
except Exception as err:
node.Error('Unable to build release map: %s' % str(err))
# For File objects, set the minimum version
if node.IsA('File'):
file_min, _ = node.release_map.GetReleaseRange()
node.SetMin(file_min)
return None
#
# IDLNamespaceVersionResolver
#
# A specialized visitor which traverses the AST, building a namespace tree
# as it goes. The namespace tree is mapping from a name to a version list.
# Labels must already be resolved to use.
#
class IDLNamespaceVersionResolver(IDLVisitor):
NamespaceSet = set(['AST', 'Callspec', 'Interface', 'Member', 'Struct'])
#
# When we arrive at a node we must assign it a namespace and if the
# node is named, then place it in the appropriate namespace.
#
def Arrive(self, node, parent_namespace):
# If we are a File, grab the Min version and replease mapping
if node.IsA('File'):
self.rmin = node.GetMinMax()[0]
self.release_map = node.release_map
# Set the min version on any non Label within the File
if not node.IsA('AST', 'File', 'Label', 'LabelItem'):
my_min, _ = node.GetMinMax()
if not my_min:
node.SetMin(self.rmin)
# If this object is not a namespace aware object, use the parent's one
if node.cls not in self.NamespaceSet:
node.namespace = parent_namespace
else:
# otherwise create one.
node.namespace = IDLNamespace(parent_namespace)
# If this node is named, place it in its parent's namespace
if parent_namespace and node.cls in IDLNode.NamedSet:
# Set version min and max based on properties
if self.release_map:
vmin = node.GetProperty('dev_version')
if vmin == None:
vmin = node.GetProperty('version')
vmax = node.GetProperty('deprecate')
# If no min is available, the use the parent File's min
if vmin == None:
rmin = self.rmin
else:
rmin = self.release_map.GetRelease(vmin)
rmax = self.release_map.GetRelease(vmax)
node.SetReleaseRange(rmin, rmax)
parent_namespace.AddNode(node)
# Pass this namespace to each child in case they inherit it
return node.namespace
#
# IDLFileTypeRessolver
#
# A specialized visitor which traverses the AST and sets a FILE property
# on all file nodes. In addition, searches the namespace resolving all
# type references. The namespace tree must already have been populated
# before this visitor is used.
#
class IDLFileTypeResolver(IDLVisitor):
def VisitFilter(self, node, data):
return not node.IsA('Comment', 'Copyright')
def Arrive(self, node, filenode):
# Track the file node to update errors
if node.IsA('File'):
node.SetProperty('FILE', node)
filenode = node
if not node.IsA('AST'):
file_min, _ = filenode.release_map.GetReleaseRange()
if not file_min:
print('Resetting min on %s to %s' % (node, file_min))
node.SetMinRange(file_min)
# If this node has a TYPEREF, resolve it to a version list
typeref = node.GetPropertyLocal('TYPEREF')
if typeref:
node.typelist = node.parent.namespace.FindList(typeref)
if not node.typelist:
node.Error('Could not resolve %s.' % typeref)
else:
node.typelist = None
return filenode
#
# IDLReleaseResolver
#
# A specialized visitor which will traverse the AST, and generate a mapping
# from any release to the first release in which that version of the object
# was generated. Types must already be resolved to use.
#
class IDLReleaseResolver(IDLVisitor):
def Arrive(self, node, releases):
node.BuildReleaseMap(releases)
return releases
#
# IDLAst
#
# A specialized version of the IDLNode for containing the whole of the
# AST. Construction of the AST object will cause resolution of the
# tree including versions, types, etc... Errors counts will be collected
# both per file, and on the AST itself.
#
class IDLAst(IDLNode):
def __init__(self, children):
IDLNode.__init__(self, 'AST', 'BuiltIn', 1, 0, children)
self.Resolve()
def Resolve(self):
# Set the appropriate Release=Version mapping for each File
IDLLabelResolver().Visit(self, None)
# Generate the Namesapce Tree
self.namespace = IDLNamespace(None)
IDLNamespaceVersionResolver().Visit(self, self.namespace)
# Using the namespace, resolve type references
IDLFileTypeResolver().Visit(self, None)
# Build an ordered list of all releases
releases = set()
for filenode in self.GetListOf('File'):
releases |= set(filenode.release_map.GetReleases())
# Generate a per node list of releases and release mapping
IDLReleaseResolver().Visit(self, sorted(releases))
for filenode in self.GetListOf('File'):
errors = filenode.GetProperty('ERRORS')
if errors:
self.errors += errors
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