add ExpressionUtil

hutool-extra/src/test/java/cn/hutool/extra/expression/AviatorTest.java

@@ -0,0 +1,62 @@
+package cn.hutool.extra.expression;
+
+import cn.hutool.core.lang.Console;
+import cn.hutool.core.lang.Dict;
+import cn.hutool.extra.expression.engine.aviator.AviatorEngine;
+import lombok.Data;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.Date;
+
+/**
+ * Aviator引擎单元测试，来自https://github.com/looly/hutool/pull/1203
+ */
+public class AviatorTest {
+
+	@Test
+	public void simpleTest(){
+		Foo foo = new Foo(100, 3.14f, new Date());
+		ExpressionEngine engine = new AviatorEngine();
+		String exp =
+				"\"[foo i=\"+ foo.i + \", f=\" + foo.f + \", date.year=\" + (foo.date.year+1900) + \", date.month=\" + foo.date.month + \", bars[0].name=\" + #foo.bars[0].name + \"]\"";
+		String result = (String) engine.eval(exp, Dict.create().set("foo", foo));
+		Assert.assertEquals("[foo i=100, f=3.14, date.year=2020, date.month=10, bars[0].name=bar]", result);
+
+		// Assignment.
+		exp = "#foo.bars[0].name='hello aviator' ; #foo.bars[0].name";
+		result = (String) engine.eval(exp, Dict.create().set("foo", foo));
+		Assert.assertEquals("hello aviator", result);
+		Assert.assertEquals("hello aviator", foo.bars[0].getName());
+
+		exp = "foo.bars[0] = nil ; foo.bars[0]";
+		result = (String) engine.eval(exp, Dict.create().set("foo", foo));
+		Console.log("Execute expression: " + exp);
+		Assert.assertNull(result);
+		Assert.assertNull(foo.bars[0]);
+	}
+
+	@Data
+	public static class Bar {
+		public Bar() {
+			this.name = "bar";
+		}
+		private String name;
+	}
+
+	@Data
+	public static class Foo {
+		int i;
+		float f;
+		Date date;
+		Bar[] bars = new Bar[1];
+
+		public Foo(final int i, final float f, final Date date) {
+			super();
+			this.i = i;
+			this.f = f;
+			this.date = date;
+			this.bars[0] = new Bar();
+		}
+	}
+}

hutool-extra/src/test/java/cn/hutool/extra/expression/ExpressionUtilTest.java

@@ -0,0 +1,70 @@
+package cn.hutool.extra.expression;
+
+import cn.hutool.core.lang.Dict;
+import cn.hutool.extra.expression.engine.jexl.JexlEngine;
+import cn.hutool.extra.expression.engine.jfireel.JfireELEngine;
+import cn.hutool.extra.expression.engine.mvel.MvelEngine;
+import cn.hutool.extra.expression.engine.spel.SpELEngine;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class ExpressionUtilTest {
+
+	@Test
+	public void evalTest(){
+		final Dict dict = Dict.create()
+				.set("a", 100.3)
+				.set("b", 45)
+				.set("c", -199.100);
+		final Object eval = ExpressionUtil.eval("a-(b-c)", dict);
+		Assert.assertEquals(-143.8, (double)eval, 2);
+	}
+
+	@Test
+	public void jexlTest(){
+		ExpressionEngine engine = new JexlEngine();
+
+		final Dict dict = Dict.create()
+				.set("a", 100.3)
+				.set("b", 45)
+				.set("c", -199.100);
+		final Object eval = engine.eval("a-(b-c)", dict);
+		Assert.assertEquals(-143.8, (double)eval, 2);
+	}
+
+	@Test
+	public void mvelTest(){
+		ExpressionEngine engine = new MvelEngine();
+
+		final Dict dict = Dict.create()
+				.set("a", 100.3)
+				.set("b", 45)
+				.set("c", -199.100);
+		final Object eval = engine.eval("a-(b-c)", dict);
+		Assert.assertEquals(-143.8, (double)eval, 2);
+	}
+
+	@Test
+	public void jfireELTest(){
+		ExpressionEngine engine = new JfireELEngine();
+
+		final Dict dict = Dict.create()
+				.set("a", 100.3)
+				.set("b", 45)
+				.set("c", -199.100);
+		final Object eval = engine.eval("a-(b-c)", dict);
+		Assert.assertEquals(-143.8, (double)eval, 2);
+	}
+
+	@Test
+	public void spELTest(){
+		ExpressionEngine engine = new SpELEngine();
+
+		final Dict dict = Dict.create()
+				.set("a", 100.3)
+				.set("b", 45)
+				.set("c", -199.100);
+		final Object eval = engine.eval("#a-(#b-#c)", dict);
+		Assert.assertEquals(-143.8, (double)eval, 2);
+	}
+}