目录

自定义函数

脚本中定义function

/*** 自定义函数测试* @throws Exception if any*/
@Test
public void defineFunctionTest() throws Exception {final String express = "function add(int a,int b){\n" +"  return a+b;\n" +"};\n" +"\n" +"function sub(int a,int b){\n" +"  return a - b;\n" +"};\n" +"\n" +"a=10;\n" +"return add(a,4) + sub(a,9);";ExpressRunner runner = new ExpressRunner();DefaultContext<String, Object> context = new DefaultContext<>();Object r = runner.execute(express, context, null, true, false);Assert.assertEquals(15, r);
}

拓展操作符

替换关键字

@Test
public void replaceKeywordTest() throws Exception {ExpressRunner runner = new ExpressRunner();runner.addOperatorWithAlias("如果", "if", null);runner.addOperatorWithAlias("则", "then", null);runner.addOperatorWithAlias("否则", "else", null);DefaultContext<String, Object> context = new DefaultContext<>();final String express = "如果(1>2){ return 10;} 否则 {return 5;}";Object r = runner.execute(express, context, null, true, false);Assert.assertEquals(5, r);
}

Operator

• JoinOperator.java

import com.ql.util.express.Operator;/*** @author houbinbin*/
public class JoinOperator extends Operator {private static final long serialVersionUID = 5653601029469696306L;@Overridepublic Object executeInner(Object[] objects) {java.util.List result = new java.util.ArrayList();for (Object object : objects) {if (object instanceof java.util.List) {result.addAll(((java.util.List) object));} else {result.add(object);}}return result;}
}

• OperatorTest.java

@Test
public void addOperatorTest() throws Exception {ExpressRunner runner = new ExpressRunner();DefaultContext<String, Object> context = new DefaultContext<>();runner.addOperator("join", new JoinOperator());Object r = runner.execute("1 join 2 join 3", context, null, false, false);Assert.assertEquals(Arrays.asList(1,2,3), r);
}
@Test
public void replaceOperatorTest() throws Exception {ExpressRunner runner = new ExpressRunner();DefaultContext<String, Object> context = new DefaultContext<>();runner.replaceOperator("+", new JoinOperator());Object r = runner.execute("1 + 2 + 3", context, null, false, false);Assert.assertEquals(Arrays.asList(1,2,3), r);
}
@Test
public void addFunctionTest() throws Exception {ExpressRunner runner = new ExpressRunner();DefaultContext<String, Object> context = new DefaultContext<>();runner.addFunction("join",new JoinOperator());Object r = runner.execute("join(1, 2, 3)", context, null, false, false);Assert.assertEquals(Arrays.asList(1,2,3), r);
}

宏定义

@Test
public void macroTest() throws Exception {ExpressRunner runner = new ExpressRunner();runner.addMacro("计算平均成绩", "(语文+数学+英语)/3.0");runner.addMacro("是否优秀", "计算平均成绩>90");IExpressContext<String, Object> context = new DefaultContext<>();context.put("语文", 88);context.put("数学", 99);context.put("英语", 95);Boolean result = (Boolean) runner.execute("是否优秀", context, null, false, false);Assert.assertTrue(result);
}

导航

QLExpress 系列导航