![]() |
App Engine Python SDK
v1.6.9 rev.445
The Python runtime is available as an experimental Preview feature.
|
Public Member Functions | |
def | __init__ |
def | reset |
def | add |
def | nextTree |
def | dup |
def | toTree |
def | hasNext |
def | size |
def | getDescription |
Public Attributes | |
cursor | |
singleElement | |
elements | |
dirty | |
elementDescription | |
adaptor | |
@brief Internal helper class. A generic list of elements tracked in an alternative to be used in a -> rewrite rule. We need to subclass to fill in the next() method, which returns either an AST node wrapped around a token payload or an existing subtree. Once you start next()ing, do not try to add more elements. It will break the cursor tracking I believe. @see org.antlr.runtime.tree.RewriteRuleSubtreeStream @see org.antlr.runtime.tree.RewriteRuleTokenStream TODO: add mechanism to detect/puke on modification after reading from stream
def google.appengine._internal.antlr3.tree.RewriteRuleElementStream.dup | ( | self, | |
el | |||
) |
When constructing trees, sometimes we need to dup a token or AST subtree. Dup'ing a token means just creating another AST node around it. For trees, you must call the adaptor.dupTree() unless the element is for a tree root; then it must be a node dup.
def google.appengine._internal.antlr3.tree.RewriteRuleElementStream.getDescription | ( | self | ) |
Deprecated. Directly access elementDescription attribute
def google.appengine._internal.antlr3.tree.RewriteRuleElementStream.nextTree | ( | self | ) |
Return the next element in the stream. If out of elements, throw an exception unless size()==1. If size is 1, then return elements[0]. Return a duplicate node/subtree if stream is out of elements and size==1. If we've already used the element, dup (dirty bit set).
def google.appengine._internal.antlr3.tree.RewriteRuleElementStream.reset | ( | self | ) |
Reset the condition of this stream so that it appears we have not consumed any of its elements. Elements themselves are untouched. Once we reset the stream, any future use will need duplicates. Set the dirty bit.
def google.appengine._internal.antlr3.tree.RewriteRuleElementStream.toTree | ( | self, | |
el | |||
) |
Ensure stream emits trees; tokens must be converted to AST nodes. AST nodes can be passed through unmolested.