!851 添加一个简单的占位符解析器

Merge pull request !851 from Createsequence/v6-placeholder

hutool-core/src/test/java/cn/hutool/core/text/PlaceholderParserTest.java

@@ -0,0 +1,44 @@
+package cn.hutool.core.text;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * test for {@link PlaceholderParser}
+ *
+ * @author huangchengxing
+ */
+public class PlaceholderParserTest {
+
+	@Test
+	public void testParse() {
+		String text = "i {a}{m} a {jvav} programmer";
+		PlaceholderParser parser = new PlaceholderParser(str -> str, "{", "}");
+		Assert.assertEquals(
+			"i am a jvav programmer",
+			parser.apply(text)
+		);
+
+		text = "i [a][m] a [jvav] programmer";
+		parser = new PlaceholderParser(str -> str, "[", "]");
+		Assert.assertEquals(
+			"i am a jvav programmer",
+			parser.apply(text)
+		);
+
+		text = "i \\[a][[m\\]] a [jvav] programmer";
+		parser = new PlaceholderParser(str -> str, "[", "]");
+		Assert.assertEquals(
+			"i [a][m] a jvav programmer",
+			parser.apply(text)
+		);
+
+		text = "i /[a][[m/]] a [jvav] programmer";
+		parser = new PlaceholderParser(str -> str, "[", "]", '/');
+		Assert.assertEquals(
+			"i [a][m] a jvav programmer",
+			parser.apply(text)
+		);
+	}
+
+}