本课程设计即为词法分析阶段。词法分析阶段是编译过程的第一个阶段。这个阶段的任务是从左到右一个字符一个字符地读入源程序，对构成源程序的字符流进行扫描和分解，从而识别出一个个单词（也称单词符号或符号）。如保留字（关键字或基本字）、标志符、常数、算符和界符等等。-the curriculum design shall lexical analysis stage. Lexical analysis stage of the process is to compile the first phase. This phase of the task whatever it is a character to a character read source code, which constitute the source of the characters flow scanning and decomposition, which identified a 000 word (also known as a symbol or word symbol). Words such as reservations (keyword or basic word), URI, constant, operator and so on community website.