ANTLRv4:如何读取字符串中的双引号转义双引号? [英] ANTLRv4: How to read double quote escaped double quotes in string?

问题描述

在ANTLR v4中，我们如何像VBA中那样用双引号转义的双引号解析这种字符串?

In ANTLR v4, how do we parse this kind of string with double quote escaped double quotes like in VBA?

对于文本:

"some string with ""john doe"" in it"

目标是识别字符串: some string with "john doe" in it

the goal would be to identify the string: some string with "john doe" in it

是否可以重写它以将双双引号转换为单双引号? "" -> "?

And is it possible to rewrite it to turn double double quotes in single double quotes? "" -> "?

推荐答案

像这样:

STRING
 : '"' (~[\r\n"] | '""')* '"'
 ;

其中~[\r\n"] | '""'表示:

~[\r\n"]    # any char other than '\r', '\n' and double quotes
|           # OR
'""'        # two successive double quotes

是否可以重写它以将双双引号转换为单双引号?

并非没有嵌入自定义代码.在Java中看起来像这样:

Not without embedding custom code. In Java that could look like:

STRING
 : '"' (~[\r\n"] | '""')* '"' 
   {
     String s = getText();
     s = s.substring(1, s.length() - 1); // strip the leading and trailing quotes
     s = s.replace("\"\"", "\""); // replace all double quotes with single quotes
     setText(s);
   }
 ;

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