Package org.antlr.runtime.tree
Class RewriteRuleSubtreeStream
java.lang.Object
org.antlr.runtime.tree.RewriteRuleElementStream
org.antlr.runtime.tree.RewriteRuleSubtreeStream
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Field Summary
Fields inherited from class org.antlr.runtime.tree.RewriteRuleElementStream
adaptor, cursor, dirty, elementDescription, elements, singleElement
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Constructor Summary
ConstructorsConstructorDescriptionRewriteRuleSubtreeStream
(TreeAdaptor adaptor, String elementDescription) RewriteRuleSubtreeStream
(TreeAdaptor adaptor, String elementDescription, Object oneElement) Create a stream with one elementRewriteRuleSubtreeStream
(TreeAdaptor adaptor, String elementDescription, List elements) Create a stream, but feed off an existing list -
Method Summary
Methods inherited from class org.antlr.runtime.tree.RewriteRuleElementStream
_next, add, getDescription, hasNext, nextTree, reset, size, toTree
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Constructor Details
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RewriteRuleSubtreeStream
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RewriteRuleSubtreeStream
Create a stream with one element -
RewriteRuleSubtreeStream
Create a stream, but feed off an existing list
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Method Details
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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
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
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