As input a sentence, if the sentence is lawful sentence corresponding output syntax tree to the output of the process every step of the sign changes in the stack. 如输入一个句子,如果该句子合法则输出与句子对应的语法树;能够输出分析过程中每一步符号栈的变化情况。
The syntax tree is gained during parsing web resources by means of using heap and stack. 在解析网页资源的过程中,通过使用堆栈来进行相关的操作,得到了所需的语法树。