[英]Trouble with boost::spirit::lex - punctuation characters
I want to create a lex::token_def<> that contains character sequences like '[' or ']' or '&>'我想创建一个 lex::token_def<> 包含像 '[' 或 ']' 或 '&>' 这样的字符序列
I tried escaping the necessary characters:我尝试转义必要的字符:
namespace lex = boost::spirit::lex;
enum LexerIDs { ID_IDENTIFIER, ID_WHITESPACE, ID_INTEGER, ID_FLOAT, ID_PUNCTUATOR };
template <typename Lexer>
struct my_lexer : lex::lexer<Lexer>
{
my_lexer() : punctuator("\[|\]|\(|\)|\.|&>|\*\*|\*|\+|-|~|!|/|%|<<|>>|<|>|<=|>=|==|!=")
{
this->self.add(punctuator, ID_PUNCTUATOR);
}
lex::token_def<> punctuator;
};
but this gives me some warning about unrecognized escaped characters & lexing a string with it fails.但这给了我一些关于无法识别的转义字符的警告,并用它来对字符串进行词法分析失败。 How can I do this correctly?我怎样才能正确地做到这一点?
You need an extra escaping level:您需要一个额外的转义级别:
my_lexer() : punctuator("\\[|\\]|\\(|\\)|\\.|&>|\\*\\*|\\*|\\+|-|~|!|/|%|<<|>>|<|>|<=|>=|==|!=")
"\\\\"
is a string literal containing one backslash, which the lexer constructor then parses. "\\\\"
是一个包含一个反斜杠的字符串文字,词法分析器构造函数然后解析它。
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