/// <summary>
/// 词法解析
/// </summary>
void TestSimpleLexer()
{
SimpleLexer lexer = new SimpleLexer();
String script = "int age = 45;";
Console.WriteLine("parse: " + script);
SimpleTokenReader tokenReader = lexer.Tokenize(script);
SimpleLexer.Dump(tokenReader);
//测试inta的解析
script = "inta age == 45;";
Console.WriteLine("\nparse :" + script);
tokenReader = lexer.Tokenize(script);
SimpleLexer.Dump(tokenReader);
//测试in的解析
script = "in age = 45;";
Console.WriteLine("\nparse :" + script);
tokenReader = lexer.Tokenize(script);
SimpleLexer.Dump(tokenReader);
//测试>=的解析
script = "age >= 45;";
Console.WriteLine("\nparse :" + script);
tokenReader = lexer.Tokenize(script);
SimpleLexer.Dump(tokenReader);
//测试>的解析
script = "age > 45;";
Console.WriteLine("\nparse :" + script);
tokenReader = lexer.Tokenize(script);
SimpleLexer.Dump(tokenReader);
}
/**
* 解析脚本
* @param script
* @return
* @throws Exception
*/
public ASTNode parse(String script)
{
SimpleLexer lexer = new SimpleLexer();
TokenReader tokens = lexer.Tokenize(script);
ASTNode rootNode = Prog(tokens);
return(rootNode);
}
/**
* 执行脚本，并打印输出AST和求值过程。
* @param script
*/
public void evaluate(String script)
{
try
{
SimpleLexer lexer = new SimpleLexer();
TokenReader tokens = lexer.Tokenize(script);
ASTNode tree = Prog(tokens);
DumpAST(tree, "");
evaluate(tree, "");
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}