问题描述
我无法理解如何使用BNF使用书面语法解析输入字符串。
我尝试过：
您好，我是小狗，并且最近用词法分析器构建了一个简单的脚本语言。
我正考虑制作一个为它解析，但我的尝试让我头晕目眩。让我告诉你一个关于我自己的脚本的想法的完整故事...
1.用词法分析代码分析单词。
ex）var a = 1，b = 1，cc = a + b print c=> var\\ = = \\\\b\ = \\\\c\c\ = \\\\ + + \\\\\\\\\ >
2.使用BNF或其他东西构建一个简单脚本的语法......
但是我遇到了第二号墙上搜索了很多关于BNF的文章
认为这对成功两个来说很酷和
最后我理解了BNF。这是一种描述语法的方法。
然而我被三号墙再次击中
这是如何解析一个使用BNF输入带有书面语法的字符串
有没有人可以向我解释这个？
I can't understand how to parse an input string using a written grammar using "BNF".
What I have tried:
Hello, I'm puppysss and built a simple script language with a lexer recently.
I was about to think about making a parser for it but my try made my head blown up. let me tell you an entire story of my idea for my own script...
1. Analyze a code with lexer for dividing words.
ex) "var a=1,b=1,c c=a+b print c" => "var\a\=\1\b\=\1\c\c\=\a\+\b\print\c\"
2. Build a grammar for a simple script using BNF or something ...
but I was hit by the wall of number two so googled many articles about "BNF"
thinking "it's pretty cool to success two" and
finally I understood "BNF". that was a method to describe a grammar.
however I was hit again by the wall of number three
that is how to parse an input string with a written grammar using "BNF"
Is there anyone who could explain that to me?
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