72 lines
2.7 KiB
Python
72 lines
2.7 KiB
Python
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#
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# Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
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# Use of this file is governed by the BSD 3-clause license that
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# can be found in the LICENSE.txt file in the project root.
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#
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#
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# A pattern like {@code <ID> = <expr>;} converted to a {@link ParseTree} by
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# {@link ParseTreePatternMatcher#compile(String, int)}.
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#
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from antlr4.tree.ParseTreePatternMatcher import ParseTreePatternMatcher
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from antlr4.tree.Tree import ParseTree
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from antlr4.xpath.XPath import XPath
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class ParseTreePattern(object):
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# Construct a new instance of the {@link ParseTreePattern} class.
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#
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# @param matcher The {@link ParseTreePatternMatcher} which created this
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# tree pattern.
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# @param pattern The tree pattern in concrete syntax form.
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# @param patternRuleIndex The parser rule which serves as the root of the
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# tree pattern.
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# @param patternTree The tree pattern in {@link ParseTree} form.
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#
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def __init__(self, matcher:ParseTreePatternMatcher, pattern:str, patternRuleIndex:int , patternTree:ParseTree):
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self.matcher = matcher
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self.patternRuleIndex = patternRuleIndex
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self.pattern = pattern
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self.patternTree = patternTree
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#
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# Match a specific parse tree against this tree pattern.
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#
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# @param tree The parse tree to match against this tree pattern.
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# @return A {@link ParseTreeMatch} object describing the result of the
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# match operation. The {@link ParseTreeMatch#succeeded()} method can be
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# used to determine whether or not the match was successful.
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#
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def match(self, tree:ParseTree):
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return self.matcher.match(tree, self)
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#
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# Determine whether or not a parse tree matches this tree pattern.
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#
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# @param tree The parse tree to match against this tree pattern.
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# @return {@code true} if {@code tree} is a match for the current tree
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# pattern; otherwise, {@code false}.
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#
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def matches(self, tree:ParseTree):
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return self.matcher.match(tree, self).succeeded()
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# Find all nodes using XPath and then try to match those subtrees against
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# this tree pattern.
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#
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# @param tree The {@link ParseTree} to match against this pattern.
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# @param xpath An expression matching the nodes
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#
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# @return A collection of {@link ParseTreeMatch} objects describing the
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# successful matches. Unsuccessful matches are omitted from the result,
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# regardless of the reason for the failure.
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#
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def findAll(self, tree:ParseTree, xpath:str):
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subtrees = XPath.findAll(tree, xpath, self.matcher.parser)
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matches = list()
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for t in subtrees:
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match = self.match(t)
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if match.succeeded():
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matches.append(match)
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return matches
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