package org.lilystudio.smarty4j.statement.function;
import static org.objectweb.asm.Opcodes.*;
import java.util.Map;
import org.lilystudio.smarty4j.Context;
import org.lilystudio.smarty4j.expression.IExpression;
import org.lilystudio.smarty4j.statement.Function;
import org.lilystudio.smarty4j.statement.ParameterCharacter;
import org.objectweb.asm.MethodVisitor;
/**
* 变量赋值。
*
* <pre>
* var--变量名称，必需
* value--变量的值，必需
* delimiter--如果指定它的值，函数将把value的值字符串当成一个数组输入，使用它作为输入分隔符
*
* {assign var="name" value="Bob"}
* The value of $name is {$name}.
* </pre>
*
* <b>OUTPUT:</b>
*
* <pre>
* The value of $name is Bob.
*
* {assign var="animals" value="Rat,Ox,Tiger,Hare,Dragon,Serpent,Horse,Sheep,Monkey,Rooster,Dog,Boar" delimiter=","}
* 此时animals保存的是一个数组，对应十二生肖的名称。
* </pre>
*
* @version 1.0.0, 2010/10/01
* @author 欧阳先伟
* @since Smarty 1.0
*/
public class $assign extends Function {
/** 参数定义 */
private static ParameterCharacter[] definitions = {
new ParameterCharacter(ParameterCharacter.STRING, "var"),
new ParameterCharacter(ParameterCharacter.OBJECT, "value"),
new ParameterCharacter(ParameterCharacter.STRING, null, "delimiter") };
public ParameterCharacter[] getDefinitions() {
return definitions;
}
public void parse(MethodVisitor mw, int local,
Map<String, Integer> variableNames) {
// if (delimiter != null) {
// value = value.toString().split(delimiter);
// }
// context.set(var, value);
IExpression delimiter = getParameter(2);
mw.visitVarInsn(ALOAD, CONTEXT);
IExpression var = getParameter(0);
var.parse(mw, local, variableNames);
getParameter(1).parseObject(mw, local, variableNames);
if (delimiter != null) {
mw.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "toString",
"()Ljava/lang/String;");
delimiter.parse(mw, local, variableNames);
mw.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "split",
"(Ljava/lang/String;)[Ljava/lang/String;");
}
Integer index = variableNames == null ? null : variableNames.get(var
.toString());
if (index != null) {
mw.visitInsn(DUP);
mw.visitVarInsn(ASTORE, index);
}
mw.visitMethodInsn(INVOKEVIRTUAL, Context.NAME, "set",
"(Ljava/lang/String;Ljava/lang/Object;)V");
}
}