Cup和Jflex中的JSON验证语法
我为阵列编写了以下cup文件:Cup和Jflex中的JSON验证语法,json,grammar,jflex,cup,Json,Grammar,Jflex,Cup,我为阵列编写了以下cup文件: terminal COMMA, LSQBRACKET, RSQBRACKET; terminal Integer NUMBER; non terminal array, value_list, value; non terminal Integer expr; array ::= LSQBRACKET value_list RSQBRACKET; value_list ::= value_list COMMA val
terminal COMMA, LSQBRACKET, RSQBRACKET;
terminal Integer NUMBER;
non terminal array, value_list, value;
non terminal Integer expr;
array ::= LSQBRACKET value_list RSQBRACKET;
value_list ::= value_list COMMA value | value;
value::= expr:e {: System.out.println(" value: "+e+""); :} ;
expr ::= NUMBER:n
{: RESULT=n; :}
如何为Jflex和Cup编写Json验证的完整语法?From
package org.json.simple.parser;
%%
%{
私有StringBuffer sb=新StringBuffer();
int getPosition(){
返回yychar;
}
%}
%桌子
%统一码
%状态字符串\u开始
%yylexthrow语法异常
%煤焦
十六进制D=[a-fA-F0-9]
INT=[-]?[0-9]+
DOUBLE={INT}((\[0-9]+)?([eE][-+]?[0-9]+)?)
WS=[\t\r\n]
未被替换的\u CH=[^\“\\]
回退_CH=。
%%
\{yybegin(YYINITIAL);返回新的Yytoken(Yytoken.TYPE_值,sb.toString());}
{UNESCAPED_CH}+{sb.append(yytext());}
\\\“{sb.append('”);}
\\\\{sb.append('\\');}
\\\/{sb.append('/');}
\\b{sb.append('\b');}
\\f{sb.append('\f');}
\\n{sb.append('\n');}
\\r{sb.append('\r');}
\\t{sb.append('\t');}
\\u{HEX_D}{HEX_D}{HEX_D}{HEX_D}{try{
int ch=Integer.parseInt(yytext().substring(2),16);
某人附加((字符)ch);
}
捕获(例外e){
抛出新的ParseException(yychar,ParseException.ERROR\u意外的\u异常,e);
}
}
\\{sb.append('\\');}
\{sb=null;sb=new-StringBuffer();yybeng(STRING_-BEGIN);}
{INT}{Long val=Long.valueOf(yytext());返回新的Yytoken(Yytoken.TYPE_VALUE,val);}
{DOUBLE}{DOUBLE val=DOUBLE.valueOf(yytext());返回新的Yytoken(Yytoken.TYPE_VALUE,val);}
“true”|“false”{Boolean val=Boolean.valueOf(yytext());返回新的Yytoken(Yytoken.TYPE_VALUE,val);}
“null”{返回新的Yytoken(Yytoken.TYPE_值,null);}
{{返回新的Yytoken(Yytoken.TYPE_LEFT_BRACE,null);}
“}”{返回新的Yytoken(Yytoken.TYPE_RIGHT_BRACE,null);}
“[{返回新的Yytoken(Yytoken.TYPE_LEFT_SQUARE,null);}
“]”{返回新的Yytoken(Yytoken.TYPE_RIGHT_SQUARE,null);}
“,”{返回新的Yytoken(Yytoken.TYPE_逗号,null);}
“:”{返回新的Yytoken(Yytoken.TYPE_冒号,null);}
{WS}+{}
{FALLBACK_CH}{抛出新的ParseException(yychar,ParseException.ERROR_UNEXPECTED_CHAR,新字符(yycharat(0));}
package org.json.simple.parser;
%%
%{
private StringBuffer sb=new StringBuffer();
int getPosition(){
return yychar;
}
%}
%table
%unicode
%state STRING_BEGIN
%yylexthrow ParseException
%char
HEX_D = [a-fA-F0-9]
INT = [-]?[0-9]+
DOUBLE = {INT}((\.[0-9]+)?([eE][-+]?[0-9]+)?)
WS = [ \t\r\n]
UNESCAPED_CH = [^\"\\]
FALLBACK_CH = .
%%
<STRING_BEGIN> \" { yybegin(YYINITIAL);return new Yytoken(Yytoken.TYPE_VALUE, sb.toString());}
<STRING_BEGIN> {UNESCAPED_CH}+ { sb.append(yytext());}
<STRING_BEGIN> \\\" {sb.append('"');}
<STRING_BEGIN> \\\\ {sb.append('\\');}
<STRING_BEGIN> \\\/ {sb.append('/');}
<STRING_BEGIN> \\b {sb.append('\b');}
<STRING_BEGIN> \\f {sb.append('\f');}
<STRING_BEGIN> \\n {sb.append('\n');}
<STRING_BEGIN> \\r {sb.append('\r');}
<STRING_BEGIN> \\t {sb.append('\t');}
<STRING_BEGIN> \\u{HEX_D}{HEX_D}{HEX_D}{HEX_D} { try{
int ch=Integer.parseInt(yytext().substring(2),16);
sb.append((char)ch);
}
catch(Exception e){
throw new ParseException(yychar, ParseException.ERROR_UNEXPECTED_EXCEPTION, e);
}
}
<STRING_BEGIN> \\ {sb.append('\\');}
<YYINITIAL> \" { sb = null; sb = new StringBuffer(); yybegin(STRING_BEGIN);}
<YYINITIAL> {INT} { Long val=Long.valueOf(yytext()); return new Yytoken(Yytoken.TYPE_VALUE, val);}
<YYINITIAL> {DOUBLE} { Double val=Double.valueOf(yytext()); return new Yytoken(Yytoken.TYPE_VALUE, val);}
<YYINITIAL> "true"|"false" { Boolean val=Boolean.valueOf(yytext()); return new Yytoken(Yytoken.TYPE_VALUE, val);}
<YYINITIAL> "null" { return new Yytoken(Yytoken.TYPE_VALUE, null);}
<YYINITIAL> "{" { return new Yytoken(Yytoken.TYPE_LEFT_BRACE,null);}
<YYINITIAL> "}" { return new Yytoken(Yytoken.TYPE_RIGHT_BRACE,null);}
<YYINITIAL> "[" { return new Yytoken(Yytoken.TYPE_LEFT_SQUARE,null);}
<YYINITIAL> "]" { return new Yytoken(Yytoken.TYPE_RIGHT_SQUARE,null);}
<YYINITIAL> "," { return new Yytoken(Yytoken.TYPE_COMMA,null);}
<YYINITIAL> ":" { return new Yytoken(Yytoken.TYPE_COLON,null);}
<YYINITIAL> {WS}+ {}
<YYINITIAL> {FALLBACK_CH} { throw new ParseException(yychar, ParseException.ERROR_UNEXPECTED_CHAR, new Character(yycharat(0)));}