def _ProcessBlock(self, context, global_alias_map):
"""Scans a goog.scope block to find aliases and mark alias tokens."""
alias_map = global_alias_map.copy()
# Iterate over every token in the context. Each token points to one
# context, but multiple tokens may point to the same context. We only want
# to check each context once, so keep track of those we've seen.
seen_contexts = set()
token = context.start_token
while token and self._IsTokenInParentBlock(token, context):
token_context = token.metadata.context if token.metadata else None
# Check to see if this token is an alias.
if token_context and token_context not in seen_contexts:
seen_contexts.add(token_context)
# If this is a alias statement in the goog.scope block.
if (token_context.type == ecmametadatapass.EcmaContext.VAR
and scopeutil.IsGoogScopeBlock(
token_context.parent.parent)):
match = scopeutil.MatchAlias(token_context)
# If this is an alias, remember it in the map.
if match:
alias, symbol = match
symbol = _GetAliasForIdentifier(symbol,
alias_map) or symbol
if scopeutil.IsInClosurizedNamespace(
symbol, self._closurized_namespaces):
alias_map[alias] = symbol
# If this token is an identifier that matches an alias,
# mark the token as an alias to the original symbol.
if (token.type is
javascripttokens.JavaScriptTokenType.SIMPLE_LVALUE
or token.type is
javascripttokens.JavaScriptTokenType.IDENTIFIER):
identifier = tokenutil.GetIdentifierForToken(token)
if identifier:
aliased_symbol = _GetAliasForIdentifier(
identifier, alias_map)
if aliased_symbol:
token.metadata.aliased_symbol = aliased_symbol
elif token.type == javascripttokens.JavaScriptTokenType.DOC_FLAG:
flag = token.attached_object
if flag and flag.HasType() and flag.jstype:
_SetTypeAlias(flag.jstype, alias_map)
token = token.next # Get next token
def testMatchAliasStatement_withClosurizedNamespaces(self):
closurized_namepaces = frozenset(['goog', 'myproject'])
matches = set()
for context in _FindContexts(self.start_token):
match = scopeutil.MatchAlias(context)
if match:
unused_alias, symbol = match
if scopeutil.IsInClosurizedNamespace(symbol,
closurized_namepaces):
matches.add(match)
self.assertEquals(
set([('MyClass', 'myproject.foo.MyClass'),
('Component', 'goog.ui.Component')]), matches)
def _ProcessRootContext(self, root_context):
"""Processes all goog.scope blocks under the root context."""
assert root_context.type is ecmametadatapass.EcmaContext.ROOT
# Process aliases in statements in the root scope for goog.module-style
# aliases.
global_alias_map = {}
for context in root_context.children:
if context.type == ecmametadatapass.EcmaContext.STATEMENT:
for statement_child in context.children:
if statement_child.type == ecmametadatapass.EcmaContext.VAR:
match = scopeutil.MatchModuleAlias(statement_child)
if match:
# goog.require aliases cannot use further aliases, the symbol is
# the second part of match, directly.
symbol = match[1]
if scopeutil.IsInClosurizedNamespace(
symbol, self._closurized_namespaces):
global_alias_map[match[0]] = symbol
# Process each block to find aliases.
for context in root_context.children:
self._ProcessBlock(context, global_alias_map)
