Package org.antlr.runtime.tree
Class RewriteRuleSubtreeStream
- java.lang.Object
-
- org.antlr.runtime.tree.RewriteRuleElementStream
-
- org.antlr.runtime.tree.RewriteRuleSubtreeStream
-
public class RewriteRuleSubtreeStream extends RewriteRuleElementStream
-
-
Field Summary
-
Fields inherited from class org.antlr.runtime.tree.RewriteRuleElementStream
adaptor, cursor, dirty, elementDescription, elements, singleElement
-
-
Constructor Summary
Constructors Constructor Description RewriteRuleSubtreeStream(TreeAdaptor adaptor, String elementDescription)
RewriteRuleSubtreeStream(TreeAdaptor adaptor, String elementDescription, Object oneElement)
Create a stream with one elementRewriteRuleSubtreeStream(TreeAdaptor adaptor, String elementDescription, List<Object> elements)
Create a stream, but feed off an existing list
-
Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected Object
dup(Object el)
When constructing trees, sometimes we need to dup a token or AST subtree.Object
nextNode()
Treat next element as a single node even if it's a subtree.-
Methods inherited from class org.antlr.runtime.tree.RewriteRuleElementStream
_next, add, getDescription, hasNext, nextTree, reset, size, toTree
-
-
-
-
Constructor Detail
-
RewriteRuleSubtreeStream
public RewriteRuleSubtreeStream(TreeAdaptor adaptor, String elementDescription)
-
RewriteRuleSubtreeStream
public RewriteRuleSubtreeStream(TreeAdaptor adaptor, String elementDescription, Object oneElement)
Create a stream with one element
-
RewriteRuleSubtreeStream
public RewriteRuleSubtreeStream(TreeAdaptor adaptor, String elementDescription, List<Object> elements)
Create a stream, but feed off an existing list
-
-
Method Detail
-
nextNode
public Object nextNode()
Treat next element as a single node even if it's a subtree. This is used instead of next() when the result has to be a tree root node. Also prevents us from duplicating recently-added children; e.g., ^(type ID)+ adds ID to type and then 2nd iteration must dup the type node, but ID has been added. Referencing a rule result twice is ok; dup entire tree as we can't be adding trees as root; e.g., expr expr. Hideous code duplication here with super.next(). Can't think of a proper way to refactor. This needs to always call dup node and super.next() doesn't know which to call: dup node or dup tree.
-
dup
protected Object dup(Object el)
Description copied from class:RewriteRuleElementStream
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.- Specified by:
dup
in classRewriteRuleElementStream
-
-