javapub.l

现将本人搜集常用的程序设计语言的词法和形式文法提供给大家。其中

%{
/**************************************************************/
/* This file contains a restricted lexer for java language.   */
/* The lexer will scan java programs in ASCII without unicode */
/* characters and/or unicode escape sequences.                */
/* It is provided only to enable the grammar user to test it  */
/* right away.                                                */
/**************************************************************/
#include <YTAB.H>
%}

Separator	[\(\)\{\}\[\]\;\,\.]
Delimiter1	[\=\>\<\!\~\?\:\+\-\*\/\&\|\^\%]
HexDigit	[0-9a-fA-F]
Digit		[0-9]
OctalDigit	[0-7]
TetraDigit	[0-3]
NonZeroDigit	[1-9]
Letter		[a-zA-Z_]
AnyButSlash	[^\/]
AnyButAstr	[^\*]
BLK		[\b]
TAB		[\t]
FF		[\f]
ESCCHR		[\\]
CR		[\r]
LF		[\n]

Escape		[\\]([r]|[n]|[b]|[f]|[t]|[\\])
Identifier 	{Letter}({Letter}|{Digit})*

Comment1        [\/][\*]({AnyButAstr}|[\*]{AnyButSlash})*[\*][\/]
Comment2        [\/][\/].*
Comment		({Comment1}|{Comment2})
WhiteSpace	({CR}|{LF}|{FF}|{TAB}|{BLK}|[ ])

Dimension	[\[]({WhiteSpace}|{Comment})*[\]]

IntSuffix	([l]|[L])
DecimalNum	{NonZeroDigit}{Digit}*{IntSuffix}?
OctalNum	[0]{OctalDigit}*{IntSuffix}?
HexNum		[0]([x]|[X]){HexDigit}{HexDigit}*{IntSuffix}?
IntegerLiteral	({DecimalNum}|{OctalNum}|{HexNum})

Sign		([\+]|[\-])
FlSuffix	([f]|[F]|[d][D])
SignedInt	{Sign}?{Digit}+
Expo		([e]|[E])
ExponentPart	{Expo}{SignedInt}?
Float1          {Digit}+[\.]{Digit}+?{ExponentPart}?{FlSuffix}?
Float2		[\.]{Digit}+{ExponentPart}?{FlSuffix}?
Float3		{Digit}+{ExponentPart}{FlSuffix}?
Float4		{Digit}+{FlSuffix}
FloatingPoint	({Float1}|{Float2}|{Float3}|{Float4})

AnyChrChr	[^\\']
AnyStrChr	[^\\"]
Character	[\']({Escape}|{AnyChrChr})[\']
String		[\"]({Escape}|{AnyStrChr})*[\"]
Numeric  	({IntegerLiteral}|{FloatingPoint})
Literal		({Numeric}|{Character}|{String})



%%

"true"		{return LITERAL;}
"false"		{return LITERAL;}

{Separator}	{return yytext[0];}
{Delimiter1}	{return yytext[0];}
{Dimension}	{return OP_DIM;}

"=="		{return OP_EQ;}
"<="		{return OP_LE;}
">="		{return OP_GE;}
"!="		{return OP_NE;}
"||"		{return OP_LOR;}
"&&"		{return OP_LAND;}
"++"		{return OP_INC;}
"--"		{return OP_DEC;}
">>"		{return OP_SHR;}
"<<"		{return OP_SHL;}
">>>"		{return OP_SHRR;}
"+="		{return ASS_ADD;}
"-="		{return ASS_SUB;}
"*="		{return ASS_MUL;}
"/="		{return ASS_DIV;}
"&="		{return ASS_AND;}
"|="		{return ASS_OR;}
"^="		{return ASS_XOR;}
"%="		{return ASS_MOD;}
"<<="		{return ASS_SHL;}
">>="		{return ASS_SHR;}
">>>="		{return ASS_SHRR;}

"abstract"	{return ABSTRACT;}
"do"            {return DO;}
"implements"    {return IMPLEMENTS;}
"package"	{return PACKAGE;}
"throw"		{return THROW;}
"boolean"	{return BOOLEAN;}
"double"	{return DOUBLE;}
"import"	{return IMPORT;}
"private"	{return PRIVATE;}
"throws"	{return THROWS;}
"break"		{return BREAK;}
"else"		{return ELSE;}
"inner"		{return INNER;}
"protected"	{return PROTECTED;}
"transient"	{return TRANSIENT;}
"byte"		{return BYTE;}
"extends"	{return EXTENDS;}
"instanceof"	{return INSTANCEOF;}
"public"	{return PUBLIC;}
"try"		{return TRY;}
"case"		{return CASE;}
"final"		{return FINAL;}
"int"		{return INT;}
"rest"		{return REST;}
"var"		{return VAR;}
"cast"		{return CAST;}
"finally"	{return FINALLY;}
"interface"	{return INTERFACE;}
"return"	{return RETURN;}
"void"		{return VOID;}
"catch"		{return CATCH;}
"float"		{return FLOAT;}
"long"		{return LONG;}
"short"		{return SHORT;}
"volatile"	{return VOLATILE;}
"char"		{return CHAR;}
"for"		{return FOR;}
"native"	{return NATIVE;}
"static"	{return STATIC;}
"while"		{return WHILE;}
"class"		{return CLASS;}
"future"	{return FUTURE;}
"new"		{return NEW;}
"super"		{return SUPER;}
"const"		{return CONST;}
"generic"	{return GENERIC;}
"null"		{return NULL;}
"switch"	{return SWITCH;}
"continue"	{return CONTINUE;}
"goto"		{return GOTO;}
"operator"	{return OPERATOR;}
"synchronized"	{return SYNCHRONIZED;}
"default"	{return DEFAULT;}
"if"		{return IF;}
"outer"		{return OUTER;}
"this"		{return THIS;}

{Identifier}	{return IDENTIFIER;}

{Literal}	{return LITERAL;}

{WhiteSpace}    {}

{Comment}	{}