enjoy 3.6 release ^_^

.gitignore

@@ -51,3 +51,4 @@ a_little_config_pro.txt
 
 dev_plan.txt
 
+

LICENSE

@@ -192,3 +192,5 @@ third-party archives.
 
 
 
+
+

README.md

@@ -1,10 +1,10 @@
 ### Enjoy
 
-Enjoy 是基于 Java 语言的极轻量极魔板引擎。极轻量级仅 171K 并且不依赖任何第三方。极简设计仅 if、for、set、define、include、render 六个核心指令，让学习成本低到极致。独创 DKFF(Dynamic Key Feature Forward) 词法分析算法与 DLRD (Double Layer Recursive Descent)语法分析算法，避免使用 javacc、antlr、jflex 生成器，令代码量少到极致。
+Enjoy 是基于 Java 语言的极轻量极魔板引擎。极轻量级仅 171K 并且不依赖任何第三方。极简设计仅 if、for、switch、set、define、include、render 七个核心指令，让学习成本低到极致。独创 DKFF(Dynamic Key Feature Forward) 词法分析算法与 DLRD (Double Layer Recursive Descent)语法分析算法，避免使用 javacc、antlr、jflex 生成器，令代码量少到极致。
 
 #### Enjoy 主要特点
-- 消灭传统模板引擎中大量繁杂概念，仅六个核心指令，学习成本极低
+- 消灭传统模板引擎中大量繁杂概念，仅七个核心指令，学习成本极低
-- 独创 DKFF 词法分析算法与 DLRD 语法分析算法，避免使用javacc、antlr
+- 独创 DKFF 词法分析算法与 DLRD 语法分析算法，避免使用 javacc、antlr
 - 功能强大，极为简单覆盖掉 freemarker、velocity 的核心功能
 - 扩展性强，支持多种扩展方式，且是唯一支持指令级扩展的模板引擎
 - 与 java 打通式设计，在模板中与 java 交互极为方便

pom.xml

@@ -73,8 +73,8 @@
 				<artifactId>maven-compiler-plugin</artifactId>
 				<version>3.6.1</version>
 				<configuration>
-					<source>1.7</source>
+					<source>1.8</source>
-					<target>1.7</target>
+					<target>1.8</target>
 				</configuration>
 			</plugin>
 			
@@ -121,7 +121,7 @@
 				  </execution>
 				</executions>
 				<configuration>
-					<skip>true</skip>
+					<skip>false</skip>
 				</configuration>
 			</plugin>
 

src/main/java/com/jfinal/kit/Kv.java

@@ -113,6 +113,20 @@ public class Kv extends HashMap {
 		return this;
 	}
 	
+	public Kv setIfNotBlank(Object key, String value) {
+		if (StrKit.notBlank(value)) {
+			set(key, value);
+		}
+		return this;
+	}
+	
+	public Kv setIfNotNull(Object key, Object value) {
+		if (value != null) {
+			set(key, value);
+		}
+		return this;
+	}
+	
 	public Kv set(Map map) {
 		super.putAll(map);
 		return this;

src/main/java/com/jfinal/kit/ReflectKit.java

@@ -24,7 +24,7 @@ public class ReflectKit {
 	public static Object newInstance(Class<?> clazz) {
 		try {
 			return clazz.newInstance();
-		} catch (Exception e) {
+		} catch (ReflectiveOperationException e) {
 			throw new RuntimeException(e);
 		}
 	}

src/main/java/com/jfinal/template/Engine.java

@@ -520,8 +520,8 @@ public class Engine {
 	 * Engine.addFieldGetter(1, new IsMethodFieldGetter());
 	 * 
 	 * 注：IsMethodFieldGetter 系统已经提供，只是默认没有启用。该实现类通过调用
-	 *    target.isXxx() 方法获取 target.xxx 表达式的值，其中 xxx 字段必须是
+	 *    target.isXxx() 方法获取 target.xxx 表达式的值，其中 isXxx() 返回值
-	 *    Boolean/boolean 类型
+	 *    必须是 Boolean/boolean 类型才会被调用
 	 */
 	public static void addFieldGetter(int index, FieldGetter fieldGetter) {
 		FieldKit.addFieldGetter(index, fieldGetter);

src/main/java/com/jfinal/template/EngineConfig.java

@@ -73,9 +73,9 @@ public class EngineConfig {
 		addDirective("string", StringDirective.class);
 		addDirective("random", RandomDirective.class);
 		addDirective("number", NumberDirective.class);
+		addDirective("call", CallDirective.class);
 		
 		// Add official shared method of Template Engine
-		// addSharedMethod(new Json());
 		addSharedMethod(new SharedMethodLib());
 	}
 	
@@ -83,6 +83,7 @@ public class EngineConfig {
 	 * Add shared function with file
 	 */
 	public void addSharedFunction(String fileName) {
+		fileName = fileName.replace("\\", "/");
 		// FileSource fileSource = new FileSource(baseTemplatePath, fileName, encoding);
 		ISource source = sourceFactory.getSource(baseTemplatePath, fileName, encoding);
 		doAddSharedFunction(source, fileName);
@@ -261,8 +262,9 @@ public class EngineConfig {
 			throw new IllegalArgumentException("baseTemplatePath can not be blank");
 		}
 		baseTemplatePath = baseTemplatePath.trim();
+		baseTemplatePath = baseTemplatePath.replace("\\", "/");
 		if (baseTemplatePath.length() > 1) {
-			if (baseTemplatePath.endsWith("/") || baseTemplatePath.endsWith("\\")) {
+			if (baseTemplatePath.endsWith("/")) {
 				baseTemplatePath = baseTemplatePath.substring(0, baseTemplatePath.length() - 1);
 			}
 		}

src/main/java/com/jfinal/template/expr/ExprParser.java

@@ -21,28 +21,7 @@ import java.util.LinkedHashMap;
 import java.util.List;
 import com.jfinal.template.EngineConfig;
 import com.jfinal.template.expr.Sym;
-import com.jfinal.template.expr.ast.Arith;
+import com.jfinal.template.expr.ast.*;
-import com.jfinal.template.expr.ast.Array;
-import com.jfinal.template.expr.ast.Assign;
-import com.jfinal.template.expr.ast.Compare;
-import com.jfinal.template.expr.ast.Const;
-import com.jfinal.template.expr.ast.Expr;
-import com.jfinal.template.expr.ast.ExprList;
-import com.jfinal.template.expr.ast.Field;
-import com.jfinal.template.expr.ast.ForCtrl;
-import com.jfinal.template.expr.ast.Id;
-import com.jfinal.template.expr.ast.IncDec;
-import com.jfinal.template.expr.ast.Index;
-import com.jfinal.template.expr.ast.Logic;
-import com.jfinal.template.expr.ast.Map;
-import com.jfinal.template.expr.ast.Method;
-import com.jfinal.template.expr.ast.NullSafe;
-import com.jfinal.template.expr.ast.RangeArray;
-import com.jfinal.template.expr.ast.SharedMethod;
-import com.jfinal.template.expr.ast.StaticField;
-import com.jfinal.template.expr.ast.StaticMethod;
-import com.jfinal.template.expr.ast.Ternary;
-import com.jfinal.template.expr.ast.Unary;
 import com.jfinal.template.stat.Location;
 import com.jfinal.template.stat.ParaToken;
 import com.jfinal.template.stat.ParseException;

src/main/java/com/jfinal/template/expr/ast/Field.java

@@ -73,9 +73,7 @@ public class Field extends Expr {
 			if (fieldGetter.notNull()) {
 				return fieldGetter.get(target, fieldName);
 			}
-		} catch (TemplateException e) {
+		} catch (TemplateException | ParseException e) {
-			throw e;
-		} catch (ParseException e) {
 			throw e;
 		} catch (Exception e) {
 			throw new TemplateException(e.getMessage(), location, e);

src/main/java/com/jfinal/template/expr/ast/FieldGetters.java

@@ -69,9 +69,9 @@ public class FieldGetters {
 			java.lang.reflect.Method[] methodArray = targetClass.getMethods();
 			for (java.lang.reflect.Method method : methodArray) {
 				if (method.getName().equals(getterName) && method.getParameterTypes().length == 0) {
-					if (MethodKit.isForbiddenMethod(getterName)) {
+					// if (MethodKit.isForbiddenMethod(getterName)) {
-						throw new RuntimeException("Forbidden method: " + getterName);
+						// throw new RuntimeException("Forbidden method: " + getterName);
-					}
+					// }
 					
 					return new GetterMethodFieldGetter(method);
 				}

src/main/java/com/jfinal/template/expr/ast/Method.java

@@ -88,9 +88,7 @@ public class Method extends Expr {
 			}
 			throw new TemplateException(buildMethodNotFoundSignature("public method not found: " + target.getClass().getName() + ".", methodName, argValues), location);
 			
-		} catch (TemplateException e) {
+		} catch (TemplateException | ParseException e) {
-			throw e;
-		} catch (ParseException e) {
 			throw e;
 		} catch (InvocationTargetException e) {
 			Throwable t = e.getTargetException();

src/main/java/com/jfinal/template/expr/ast/SharedMethod.java

@@ -63,9 +63,7 @@ public class SharedMethod extends Expr {
 				throw new TemplateException(Method.buildMethodNotFoundSignature("Shared method not found: ", methodName, argValues), location);
 			}
 			
-		} catch (TemplateException e) {
+		} catch (TemplateException | ParseException e) {
-			throw e;
-		} catch (ParseException e) {
 			throw e;
 		} catch (Exception e) {
 			throw new TemplateException(e.getMessage(), location, e);

src/main/java/com/jfinal/template/expr/ast/StaticMethod.java

@@ -72,9 +72,7 @@ public class StaticMethod extends Expr {
 				throw new TemplateException(Method.buildMethodNotFoundSignature("public static method not found: " + clazz.getName() + "::", methodName, argValues), location);
 			}
 			
-		} catch (TemplateException e) {
+		} catch (TemplateException | ParseException e) {
-			throw e;
-		} catch (ParseException e) {
 			throw e;
 		} catch (Exception e) {
 			throw new TemplateException(e.getMessage(), location, e);

src/main/java/com/jfinal/template/ext/directive/CallDirective.java

@@ -0,0 +1,109 @@
+/**
+ * Copyright (c) 2011-2019, James Zhan 詹波 (jfinal@126.com).
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.jfinal.template.ext.directive;
+
+import java.util.ArrayList;
+import com.jfinal.template.Directive;
+import com.jfinal.template.Env;
+import com.jfinal.template.TemplateException;
+import com.jfinal.template.expr.ast.Const;
+import com.jfinal.template.expr.ast.Expr;
+import com.jfinal.template.expr.ast.ExprList;
+import com.jfinal.template.io.Writer;
+import com.jfinal.template.stat.ParseException;
+import com.jfinal.template.stat.Scope;
+import com.jfinal.template.stat.ast.Define;
+
+/**
+ * CallDirective 动态调用模板函数
+ * 
+ * 模板函数的名称与参数都可以动态指定，提升模板函数调用的灵活性
+ * 
+ * 例如：
+ *     #call(funcName, p1, p2, ..., pn)
+ *     其中 funcName，为函数名，p1、p2、pn 为被调用函数所使用的参数
+ * 
+ * 
+ * 如果希望模板函数不存在时忽略其调用，添加常量值 true 在第一个参数位置即可
+ * 例如：
+ *     #call(true, funcName, p1, p2, ..., pn)
+ * 
+ * 
+ * TODO 后续优化看一下 ast.Call.java
+ */
+public class CallDirective extends Directive {
+	
+	protected Expr funcNameExpr;
+	protected ExprList paraExpr;
+	
+	protected boolean nullSafe = false;		// 是否支持函数名不存在时跳过
+	
+	public void setExprList(ExprList exprList) {
+		int len = exprList.length();
+		if (len == 0) {
+			throw new ParseException("模板函数名不能缺失", location);
+		}
+		
+		int index = 0;
+		Expr expr = exprList.getExpr(index);
+		if (expr instanceof Const && ((Const)expr).isBoolean()) {
+			if (len == 1) {
+				throw new ParseException("模板函数名不能缺失", location);
+			}
+			
+			nullSafe = ((Const)expr).getBoolean();
+			index++;
+		}
+		
+		funcNameExpr = exprList.getExpr(index++);
+		
+		ArrayList<Expr> list = new ArrayList<Expr>();
+		for (int i=index; i<len; i++) {
+			list.add(exprList.getExpr(i));
+		}
+		paraExpr = new ExprList(list);
+	}
+	
+	public void exec(Env env, Scope scope, Writer writer) {
+		Object funcNameValue = funcNameExpr.eval(scope);
+		if (funcNameValue == null) {
+			if (nullSafe) {
+				return ;
+			}
+			throw new TemplateException("模板函数名为 null", location);
+		}
+		
+		if (!(funcNameValue instanceof String)) {
+			throw new TemplateException("模板函数名必须是字符串", location);
+		}
+		
+		Define func = env.getFunction(funcNameValue.toString());
+		
+		if (func == null) {
+			if (nullSafe) {
+				return ;
+			}
+			throw new TemplateException("模板函数未找到 : " + funcNameValue, location);
+		}
+		
+		func.call(env, scope, paraExpr, writer);
+	}
+}
+
+
+
+

src/main/java/com/jfinal/template/io/ByteWriter.java

@@ -46,15 +46,7 @@ public class ByteWriter extends Writer {
 	}
 	
 	public void close() {
-		try {
+		out = null;
-			if (out != null) {
-				out.flush();
-			}
-		} catch (IOException e) {
-			throw new RuntimeException(e);
-		} finally {
-			out = null;
-		}
 	}
 	
 	public void write(String str, int offset, int len) throws IOException {

src/main/java/com/jfinal/template/io/CharWriter.java

@@ -40,15 +40,7 @@ public class CharWriter extends Writer {
 	}
 	
 	public void close() {
-		try {
+		out = null;
-			if (out != null) {
-				out.flush();
-			}
-		} catch (IOException e) {
-			throw new RuntimeException(e);
-		} finally {
-			out = null;
-		}
 	}
 	
 	public void write(String str, int offset, int len) throws IOException {

src/main/java/com/jfinal/template/stat/Parser.java

@@ -24,22 +24,7 @@ import com.jfinal.template.expr.ExprParser;
 import com.jfinal.template.expr.ast.ExprList;
 import com.jfinal.template.expr.ast.ForCtrl;
 import com.jfinal.template.stat.Symbol;
-import com.jfinal.template.stat.ast.Break;
+import com.jfinal.template.stat.ast.*;
-import com.jfinal.template.stat.ast.Call;
-import com.jfinal.template.stat.ast.Continue;
-import com.jfinal.template.stat.ast.Define;
-import com.jfinal.template.stat.ast.Else;
-import com.jfinal.template.stat.ast.ElseIf;
-import com.jfinal.template.stat.ast.For;
-import com.jfinal.template.stat.ast.If;
-import com.jfinal.template.stat.ast.Include;
-import com.jfinal.template.stat.ast.Return;
-import com.jfinal.template.stat.ast.Set;
-import com.jfinal.template.stat.ast.SetGlobal;
-import com.jfinal.template.stat.ast.SetLocal;
-import com.jfinal.template.stat.ast.Stat;
-import com.jfinal.template.stat.ast.StatList;
-import com.jfinal.template.stat.ast.Text;
 
 /**
  * DLRD (Double Layer Recursive Descent) Parser
@@ -227,7 +212,41 @@ public class Parser {
 		case ELSE:
 		case END:
 		case EOF:
+		case CASE:
+		case DEFAULT:
 			return null;
+		case SWITCH:
+			move();
+			para = matchPara(name);
+			Switch _switch = new Switch(parseExprList(para), getLocation(name.row));
+			
+			CaseSetter currentCaseSetter = _switch;
+			for (Token currentToken=peek(); ; currentToken=peek()) {
+				if (currentToken.symbol == Symbol.CASE) {
+					move();
+					para = matchPara(currentToken);
+					statList = statList();
+					Case nextCase = new Case(parseExprList(para), statList, getLocation(currentToken.row));
+					currentCaseSetter.setNextCase(nextCase);
+					currentCaseSetter = nextCase;
+				} else if (currentToken.symbol == Symbol.DEFAULT) {
+					move();
+					statList = statList();
+					Default _default = new Default(statList);
+					_switch.setDefault(_default, getLocation(currentToken.row));
+				} else if (currentToken.symbol == Symbol.TEXT) {
+					TextToken tt = (TextToken)currentToken;
+					if (tt.getContent().toString().trim().length() != 0) {
+						throw new ParseException("Syntax error: expect #case or #default directive", getLocation(currentToken.row));
+					}
+					move();
+				} else {
+					break ;
+				}
+			}
+			
+			matchEnd(name);
+			return _switch;
 		default :
 			throw new ParseException("Syntax error: can not match the token: " + name.value(), getLocation(name.row));
 		}

src/main/java/com/jfinal/template/stat/Symbol.java

@@ -45,6 +45,10 @@ enum Symbol {
 	BREAK("break", false),
 	RETURN("return", false),
 	
+	SWITCH("switch", true),
+	CASE("case", true),
+	DEFAULT("default", false),
+	
 	ID("ID", false),				// 标识符：下划线或字母开头 ^[A-Za-z_][A-Za-z0-9_]*$
 	PARA("PARA", false),
 	
@@ -68,6 +72,10 @@ enum Symbol {
 		put(Symbol.CONTINUE.getName(), CONTINUE);
 		put(Symbol.RETURN.getName(), RETURN);
 		
+		put(Symbol.SWITCH.getName(), SWITCH);
+		put(Symbol.CASE.getName(), CASE);
+		put(Symbol.DEFAULT.getName(), DEFAULT);
+		
 		put(Symbol.DEFINE.getName(), DEFINE);
 		put(Symbol.SET.getName(), SET);
 		put(Symbol.SET_LOCAL.getName(), SET_LOCAL);

src/main/java/com/jfinal/template/stat/ast/Case.java

@@ -0,0 +1,89 @@
+/**
+ * Copyright (c) 2011-2019, James Zhan 詹波 (jfinal@126.com).
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.jfinal.template.stat.ast;
+
+import com.jfinal.template.Env;
+import com.jfinal.template.TemplateException;
+import com.jfinal.template.expr.ast.Expr;
+import com.jfinal.template.expr.ast.ExprList;
+import com.jfinal.template.io.Writer;
+import com.jfinal.template.stat.Location;
+import com.jfinal.template.stat.ParseException;
+import com.jfinal.template.stat.Scope;
+
+/**
+ * Case
+ */
+public class Case extends Stat implements CaseSetter {
+	
+	private Expr[] exprArray;
+	private Stat stat;
+	private Case nextCase;
+	
+	public Case(ExprList exprList, StatList statList, Location location) {
+		if (exprList.length() == 0) {
+			throw new ParseException("The parameter of #case directive can not be blank", location);
+		}
+		
+		this.exprArray = exprList.getExprArray();
+		this.stat = statList.getActualStat();
+	}
+	
+	public void setNextCase(Case nextCase) {
+		this.nextCase = nextCase;
+	}
+	
+	public void exec(Env env, Scope scope, Writer writer) {
+		throw new TemplateException("#case 指令的 exec 不能被调用", location);
+	}
+	
+	boolean execIfMatch(Object switchValue, Env env, Scope scope, Writer writer) {
+		if (exprArray.length == 1) {
+			Object value = exprArray[0].eval(scope);
+			
+			// 照顾 null == null 以及数值比较小的整型数据比较
+			if (value == switchValue) {
+				stat.exec(env, scope, writer);
+				return true;
+			}
+			
+			if (value != null && value.equals(switchValue)) {
+				stat.exec(env, scope, writer);
+				return true;
+			}
+		} else {
+			for (Expr expr : exprArray) {
+				Object value = expr.eval(scope);
+				
+				// 照顾 null == null 以及数值比较小的整型数据比较
+				if (value == switchValue) {
+					stat.exec(env, scope, writer);
+					return true;
+				}
+				
+				if (value != null && value.equals(switchValue)) {
+					stat.exec(env, scope, writer);
+					return true;
+				}
+			}
+		}
+		
+		return nextCase != null ? nextCase.execIfMatch(switchValue, env, scope, writer) : false;
+	}
+}
+
+

src/main/java/com/jfinal/template/stat/ast/CaseSetter.java

@@ -0,0 +1,24 @@
+/**
+ * Copyright (c) 2011-2019, James Zhan 詹波 (jfinal@126.com).
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.jfinal.template.stat.ast;
+
+/**
+ * CaseSetter
+ */
+public interface CaseSetter {
+	public void setNextCase(Case nextCase);
+}

src/main/java/com/jfinal/template/stat/ast/Default.java

@@ -0,0 +1,39 @@
+/**
+ * Copyright (c) 2011-2019, James Zhan 詹波 (jfinal@126.com).
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.jfinal.template.stat.ast;
+
+import com.jfinal.template.Env;
+import com.jfinal.template.io.Writer;
+import com.jfinal.template.stat.Scope;
+
+/**
+ * Default
+ * 
+ * #switch 指令内部的 #default 指令
+ */
+public class Default extends Stat {
+	
+	private Stat stat;
+	
+	public Default(StatList statList) {
+		this.stat = statList.getActualStat();
+	}
+	
+	public void exec(Env env, Scope scope, Writer writer) {
+		stat.exec(env, scope, writer);
+	}
+}

src/main/java/com/jfinal/template/stat/ast/Output.java

@@ -71,9 +71,7 @@ public class Output extends Stat {
 			} else if (value != null) {
 				writer.write(value.toString());
 			}
-		} catch (TemplateException e) {
+		} catch(TemplateException | ParseException e) {
-			throw e;
-		} catch (ParseException e) {
 			throw e;
 		} catch(Exception e) {
 			throw new TemplateException(e.getMessage(), location, e);

src/main/java/com/jfinal/template/stat/ast/Switch.java

@@ -0,0 +1,111 @@
+/**
+ * Copyright (c) 2011-2019, James Zhan 詹波 (jfinal@126.com).
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.jfinal.template.stat.ast;
+
+import com.jfinal.template.Env;
+import com.jfinal.template.expr.ast.Expr;
+import com.jfinal.template.expr.ast.ExprList;
+import com.jfinal.template.io.Writer;
+import com.jfinal.template.stat.Location;
+import com.jfinal.template.stat.ParseException;
+import com.jfinal.template.stat.Scope;
+
+/**
+ * Switch
+ * 
+ * #switch 指令与 Java 12 switch 新特性的设计相似: http://openjdk.java.net/jeps/325
+ * 
+ * 在与 java 老版本指令基本用法相同的基础上，主要变化与特性有：
+ * 1: 移除 java 语法中的 fall-through semantics，即不需要 break 关键字进行断开
+ * 2: 不引入 #break 指令，代码更少、更优雅
+ * 3: #case 参数可使用多个用逗号分隔的表达式，每个表达式求值后与 #switch 参数求值后比较，
+ *    从根本上消除了 #break 指令的必要性
+ * 4: #case 支持任意类型数据与表达式（java 语言只支持少数常量类型）
+ * 
+ * <pre>
+ * 示例：
+ *   #switch (month)
+ *     #case (1, 3, 5, 7, 8, 10, 12)
+ *       #(month) 月有 31 天
+ *     #case (2)
+ *       #(month) 月平年有28天，闰年有29天
+ *     #default
+ *       月份错误: #(month ?? "null")
+ *   #end
+ * 
+ * 如上代码所示，如果 #case 指令参数有多个值，那么可以用逗号分隔，
+ * 上述逗号表达式的值 1, 3, 5, 7, 8, 10, 12 之中只要有一个与
+ * switch 指令参数 month 相等的话，该 case 分支就会被执行，
+ * 该特性从根本上消灭了 #break 指令的必要性
+ * 
+ * 
+ * 除了常量值以外 #case 参数还可以是任意表达式
+ * 例如：
+ *     #case (a, b, c, x + y, obj.method(z))
+ *     
+ * 上述代码中 #case 参数中的所有表达式先会被求值，然后逐一与 #switch
+ * 参数进行对比，同样也是只要有一个对比相等，则该 case 分支就会被执行
+ * 
+ * </pre>
+ */
+public class Switch extends Stat implements CaseSetter {
+	
+	private Expr expr;
+	private Case nextCase;
+	private Default _default;
+	
+	public Switch(ExprList exprList, Location location) {
+		if (exprList.length() == 0) {
+			throw new ParseException("The parameter of #switch directive can not be blank", location);
+		}
+		this.expr = exprList.getActualExpr();
+	}
+	
+	public void setNextCase(Case nextCase) {
+		this.nextCase = nextCase;
+	}
+	
+	public void setDefault(Default _default, Location location) {
+		if (this._default != null) {
+			throw new ParseException("The #default case of #switch is already defined", location);
+		}
+		this._default = _default;
+	}
+	
+	public void exec(Env env, Scope scope, Writer writer) {
+		Object switchValue = expr.eval(scope);
+		
+		if (nextCase != null && nextCase.execIfMatch(switchValue, env, scope, writer)) {
+			return ;
+		}
+		
+		if (_default != null) {
+			_default.exec(env, scope, writer);
+		}
+	}
+	
+	public boolean hasEnd() {
+		return true;
+	}
+}
+
+
+
+
+
+
+