JAVA动态表达式：Antlr4 表达式树解析

接上面

JAVA动态表达式：Antlr4 G4 模板 + 读取字符串表达式结构树-CSDN博客

 目前已经实现了常量及分组常规表达式的解析。

String formula = "'啦啦啦'=='1' and 1==1 and '2'=='3' and '1123' contains '1' and '23455' notcontains '5'";
String formula = "'啦啦啦'=='1' and (1==1 or 2==2) and '1123' contains '1' and '23455' notcontains '5'";
String formula = "'啦啦啦'=='1' and (1 contains 1 or 2 notcontains 2) ";
String formula = "(1==1 or 2==2) and '啦啦啦'=='1'";
String formula = "((1==1) or (2==2)) and '啦啦啦'=='1'";
String formula = "((1==1 and (2==2 or 3==3)) or (2==2 or 3==3)) and '啦啦啦'=='1'";

实现思路通过Antlr4把解析得到表达式树：

下面的RuleEntity rule对象，就是把上面的结构树给拿到了。

// 构建字符流
CodePointCharStream charStream = CharStreams.fromString(formula);
// 从字符流分析词法， 解析为token
ExprLexer lexer = new ExprLexer(charStream);
// 从token进行分析
ExprParser parser = new ExprParser(new CommonTokenStream(lexer));
// 使用监听器，遍历语法树，根据语法定义，prog为语法树的根节点
ParseTree progTree = parser.expression();
if (((ExprParser.ExpressionContext) progTree).exception != null) {
            throw new Exception("输入的表达式不符合解析规则");
}
// 遍历语法树节点
RuleEntity rule = traverseTree(progTree, name, new RuleEntity());

这样通过循环你就能得到这串表达式的每个值：((1==1 and (2==2 or 3==3)) or (2==2 or 3==3)) and '啦啦啦'=='1'

比如，第一个是( ，第二个是(，第三个是1，第四个是==......

这样你就需要通过逻辑去拼接成这样的对象：

{"id":"rule_2o0S3Ar37K","name":"","tierIndex":"1","conditionList":[{"id":"HK3e6pbRh8","type":"group","tierIndex":"2","conditionList":[{"id":"GmaIWw94NU","type":"group","tierIndex":"3","conditionList":[{"id":"gqx7N9E8p6","type":"single","leftOperatorExpression":{"id":"Constant_ZE0K2xEU82","type":"1","valueType":"double","value":"1","label":"数字"},"compareOperation":"1","rightOperatorExpression":{"id":"Constant_35054671Wu","type":"1","valueType":"double","value":"1","label":"数字"},"describe":""},{"id":"MOsI066Zys","type":"symbol","formulaRelation":"and"},{"id":"R364030W6T","type":"group","tierIndex":"4","conditionList":[{"id":"KtCN58q1Qj","type":"single","leftOperatorExpression":{"id":"Constant_3v9x4vQ716","type":"1","valueType":"double","value":"2","label":"数字"},"compareOperation":"1","rightOperatorExpression":{"id":"Constant_20I9PuvuLE","type":"1","valueType":"double","value":"2","label":"数字"},"describe":""},{"id":"1JViMLz2L0","type":"symbol","formulaRelation":"or"},{"id":"5PQD6ZU2a2","type":"single","leftOperatorExpression":{"id":"Constant_K6626YX2ya","type":"1","valueType":"double","value":"3","label":"数字"},"compareOperation":"1","rightOperatorExpression":{"id":"Constant_27885U5143","type":"1","valueType":"double","value":"3","label":"数字"},"describe":""}]}]},{"id":"D5dnzS9162","type":"symbol","formulaRelation":"or"},{"id":"F15k4S12AZ","type":"group","tierIndex":"3","conditionList":[{"id":"gJS0jy1Kl7","type":"single","leftOperatorExpression":{"id":"Constant_Z5v3vD9ky6","type":"1","valueType":"double","value":"2","label":"数字"},"compareOperation":"1","rightOperatorExpression":{"id":"Constant_W6ZlHv110E","type":"1","valueType":"double","value":"2","label":"数字"},"describe":""},{"id":"K967v6PJ8E","type":"symbol","formulaRelation":"or"},{"id":"99L0cJj55g","type":"single","leftOperatorExpression":{"id":"Constant_8VM6MJlQ08","type":"1","valueType":"double","value":"3","label":"数字"},"compareOperation":"1","rightOperatorExpression":{"id":"Constant_4bKLn5xQsA","type":"1","valueType":"double","value":"3","label":"数字"},"describe":""}]}]},{"id":"685x2JL36x","type":"symbol","formulaRelation":"and"},{"id":"tt104S829A","type":"single","leftOperatorExpression":{"id":"Constant_52nUmF4dmO","type":"1","valueType":"string","value":"啦啦啦","label":"字符串"},"compareOperation":"1","rightOperatorExpression":{"id":"Constant_08q1K2KO6s","type":"1","valueType":"string","value":"1","label":"字符串"},"describe":""}]}

 然后下面是用到的实现逻辑：

POM文件

        
            net.sf.json-lib
            json-lib
            2.2.3
            jdk15
        
        
        
            org.antlr
            antlr4
            4.10.1
        

@Test
    public void Test00() throws Exception {
        //String formula="@prices == 1 and (@val >=1 or @name