- 授权协议: GPL
- 开发语言: Java
- 操作系统: 跨平台
- 软件首页: http://www2.cs.tum.edu/projects/cup
- 软件文档: http://www2.cs.tum.edu/projects/cup/manual.html
软件介绍
JavaCUP 是 Java 语言实现的 CUP 解析器生成器。
示例代码:
// Simple Example Scanner Class // scanner.java import java_cup.runtime.*; import java.io.*; //import sym; public class scanner implements java_cup.runtime.Scanner { /* single lookahead character */ protected static int next_char; // since cup v11 we use SymbolFactories rather than Symbols private SymbolFactory sf = new DefaultSymbolFactory(); private static FileReader fileReader; public scanner(FileReader fr){ this.fileReader=fr; } /* advance input by one character */ protected static void advance() throws java.io.IOException { next_char = fileReader.read(); } /* initialize the scanner */ public static void init() throws java.io.IOException { advance(); } /* recognize and return the next complete token */ public Symbol next_token() throws java.io.IOException { for (;;) switch (next_char) { case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': /* parse a decimal integer */ int i_val = 0; do { i_val = i_val * 10 + (next_char - '0'); advance(); } while (next_char >= '0' && next_char <= '9'); return sf.newSymbol("NUMBER",sym.NUMBER, new Integer(i_val)); case ';': advance(); return sf.newSymbol("SEMI",sym.SEMI); case '+': advance(); return sf.newSymbol("PLUS",sym.PLUS); case '-': advance(); return sf.newSymbol("MINUS",sym.MINUS); case '*': advance(); return sf.newSymbol("TIMES",sym.TIMES); case '/': advance(); return sf.newSymbol("DIVIDE",sym.DIVIDE); case '%': advance(); return sf.newSymbol("MOD",sym.MOD); case '(': advance(); return sf.newSymbol("LPAREN",sym.LPAREN); case ')': advance(); return sf.newSymbol("RPAREN",sym.RPAREN); case -1: return sf.newSymbol("EOF",sym.EOF); default: /* in this simple scanner we just ignore everything else */ advance(); break; } } };
The Little Schemer
[美] Daniel P. Friedman、[美] Matthias Felleisen / 卢俊祥 / 电子工业出版社 / 2017-7 / 65.00
《The Little Schemer:递归与函数式的奥妙》是一本久负盛名的经典之作,两位作者Daniel P. Friedman、Matthias Felleisen在程序语言界名声显赫。《The Little Schemer:递归与函数式的奥妙》介绍了Scheme的基本结构及其应用、Scheme的五法十诫、Continuation-Passing-Style、Partial Function、......一起来看看 《The Little Schemer》 这本书的介绍吧!