build(antlr): 引入第三方 ANTLR4 runtime/tool 并接入构建

third_party/antlr4-runtime-4.13.2/runtime/src/tree/xpath/XPathRuleElement.cpp

@@ -0,0 +1,30 @@
+/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
+ * Use of this file is governed by the BSD 3-clause license that
+ * can be found in the LICENSE.txt file in the project root.
+ */
+
+#include "tree/ParseTree.h"
+#include "tree/Trees.h"
+
+#include "XPathRuleElement.h"
+
+using namespace antlr4::tree;
+using namespace antlr4::tree::xpath;
+
+XPathRuleElement::XPathRuleElement(const std::string &ruleName, size_t ruleIndex) : XPathElement(ruleName) {
+  _ruleIndex = ruleIndex;
+}
+
+std::vector<ParseTree *> XPathRuleElement::evaluate(ParseTree *t) {
+  // return all children of t that match nodeName
+  std::vector<ParseTree *> nodes;
+  for (auto *c : t->children) {
+    if (antlrcpp::is<ParserRuleContext *>(c)) {
+      ParserRuleContext *ctx = dynamic_cast<ParserRuleContext *>(c);
+      if ((ctx->getRuleIndex() == _ruleIndex && !_invert) || (ctx->getRuleIndex() != _ruleIndex && _invert)) {
+        nodes.push_back(ctx);
+      }
+    }
+  }
+  return nodes;
+}