用VC做的一个简单编译器.实现简单的画图-VC do a simple compiler. A simple drawing

一个简单的编译器，可以实现简单的画图语句的解析，最终画出简单的图形。涉及程序编译器的实现几个步骤，词法分析，语法分析，语义分析，等等。-a simple compiler can achieve a simple drawing of analytic statement, the final draw simple graphics. The procedures compiler in several steps, lexical analysis, grammar analysis, se

词法分析器。对任何正则表达式，构造DFA，并画出DFA的图。需要Graphviz的画图软件配合-Lexical parsers. For any regular expressions, the tectonic DFA and draw the DFA picture