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一个非常好用而且强大的基于xpath的html解析器。html的DOM树生成依赖Jsoup。Lexer 和 Parser基于Antlr4,支持完备的W3C XPATH 1.0标准语法，W3C规范：http://www.w3.org/TR/1999/REC-xpath-19991116。
// Generated from Xpath.g4 by ANTLR 4.7
package org.seimicrawler.xpath.antlr;
import org.antlr.v4.runtime.tree.ParseTreeVisitor;
/**
* This interface defines a complete generic visitor for a parse tree produced
* by {@link XpathParser}.
*
* @param The return type of the visit operation. Use {@link Void} for
* operations with no return type.
*/
public interface XpathVisitor extends ParseTreeVisitor {
/**
* Visit a parse tree produced by {@link XpathParser#main}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitMain(XpathParser.MainContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#locationPath}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitLocationPath(XpathParser.LocationPathContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#absoluteLocationPathNoroot}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitAbsoluteLocationPathNoroot(XpathParser.AbsoluteLocationPathNorootContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#relativeLocationPath}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitRelativeLocationPath(XpathParser.RelativeLocationPathContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#step}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitStep(XpathParser.StepContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#axisSpecifier}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitAxisSpecifier(XpathParser.AxisSpecifierContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#nodeTest}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitNodeTest(XpathParser.NodeTestContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#predicate}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitPredicate(XpathParser.PredicateContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#abbreviatedStep}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitAbbreviatedStep(XpathParser.AbbreviatedStepContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#expr}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitExpr(XpathParser.ExprContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#primaryExpr}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitPrimaryExpr(XpathParser.PrimaryExprContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#functionCall}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitFunctionCall(XpathParser.FunctionCallContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#unionExprNoRoot}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitUnionExprNoRoot(XpathParser.UnionExprNoRootContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#pathExprNoRoot}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitPathExprNoRoot(XpathParser.PathExprNoRootContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#filterExpr}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitFilterExpr(XpathParser.FilterExprContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#orExpr}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitOrExpr(XpathParser.OrExprContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#andExpr}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitAndExpr(XpathParser.AndExprContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#equalityExpr}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitEqualityExpr(XpathParser.EqualityExprContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#relationalExpr}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitRelationalExpr(XpathParser.RelationalExprContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#additiveExpr}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitAdditiveExpr(XpathParser.AdditiveExprContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#multiplicativeExpr}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitMultiplicativeExpr(XpathParser.MultiplicativeExprContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#unaryExprNoRoot}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitUnaryExprNoRoot(XpathParser.UnaryExprNoRootContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#qName}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitQName(XpathParser.QNameContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#functionName}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitFunctionName(XpathParser.FunctionNameContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#variableReference}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitVariableReference(XpathParser.VariableReferenceContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#nameTest}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitNameTest(XpathParser.NameTestContext ctx);
/**
* Visit a parse tree produced by {@link XpathParser#nCName}.
* @param ctx the parse tree
* @return the visitor result
*/
T visitNCName(XpathParser.NCNameContext ctx);
}