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我試圖使用JFlex的有以下輸入文件:JFlex的錯誤:意外字符:YYINITIAL
%class Lexer
%line
%column
%init{
yybegin(YYINITIAL);
%init}
%{
Copied directly to Java file.
%}
delim = \r|\n|\r\n
not_newline = .
whitespace = {delim} | [ \t\n\r]
any = {not_newline} | {delim} | {quote}
upp_letter = [A-Z]
low_letter = [a-z]
digit = [0-9]
quote = [\」]
backslash = [\\]
escape = {backslash}{any}
LPAR = [(]
RPAR = [)]
COMMA = [,]
letter = {upp_letter} | {low_letter}
ID = {letter}({letter}|{digit})*
INT = {digit}+
STRING = {quote}({letter} | {digit} | {escape})*{quote}
%%
<YYINITIAL> {
{ID} { return ID }
{INT} { return INT }
{LPAR} { return symbol(sym.LPAR); }
{RPAR} { return symbol(sym.RPAR); }
{COMMA} { return symbol(sum.COMMA); }
{STRING} { return STRING }
{whitespace} {}
}
[^] { throw new Error(「Illegal character <「+yytext()+」>」); }
(這不是100%完成呢,我只是想看看我是否有任何錯誤)
無論如何,當我嘗試使用JFLEX它給我以下錯誤:
Reading "lexer2.flex"
Error in file "lexer2.flex" (line 35):
Unexpected character
<YYINITIAL> {
^
1 error, 0 warnings.
我還以爲是在掃描器開始,它總是被默認聲明?我錯過了什麼嗎?
謝謝你的幫助。