org.apache.taglibs.standard.lang.jstl.ELParser.jj Maven / Gradle / Ivy
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/*****************************************
* OPTIONS *
*****************************************/
options {
JAVA_UNICODE_ESCAPE = false;
UNICODE_INPUT = true;
STATIC = false;
}
/*****************************************
* PARSER JAVA CODE *
*****************************************/
PARSER_BEGIN(ELParser)
package org.apache.taglibs.standard.lang.jstl.parser;
import org.apache.taglibs.standard.lang.jstl.*;
import java.util.ArrayList;
import java.util.List;
/**
* Generated EL parser.
*
* @author Nathan Abramson
* @author Shawn Bayern
*/
public class ELParser {
public static void main(String args[])
throws ParseException
{
ELParser parser = new ELParser (System.in);
parser.ExpressionString ();
}
}
PARSER_END(ELParser)
/*****************************************
* TOKENS *
*****************************************/
/*****************************************
/** Tokens appearing outside of an ${...} construct **/
TOKEN:
{
< NON_EXPRESSION_TEXT:
(~["$"])+ | ("$" (~["{", "$"])+) | "$"
>
|
< START_EXPRESSION: "${" > : IN_EXPRESSION
}
/*****************************************
/** Tokens appearing inside of an ${...} construct **/
/* WHITE SPACE */
SKIP :
{
" "
| "\t"
| "\n"
| "\r"
}
TOKEN :
{
/* Literals */
< INTEGER_LITERAL: ["0"-"9"] (["0"-"9"])* >
|
< FLOATING_POINT_LITERAL:
(["0"-"9"])+ "." (["0"-"9"])* ()?
| "." (["0"-"9"])+ ()?
| (["0"-"9"])+
>
|
< #EXPONENT: ["e","E"] (["+","-"])? (["0"-"9"])+ >
|
< STRING_LITERAL:
("\"" ((~["\"","\\"]) | ("\\" ( ["\\","\""] )))* "\"") |
("\'" ((~["\'","\\"]) | ("\\" ( ["\\","\'"] )))* "\'")
>
|
< BADLY_ESCAPED_STRING_LITERAL:
("\"" (~["\"","\\"])* ("\\" ( ~["\\","\""] ))) |
("\'" (~["\'","\\"])* ("\\" ( ~["\\","\'"] )))
>
/* Reserved Words and Symbols */
| < TRUE: "true" >
| < FALSE: "false" >
| < NULL: "null" >
| < END_EXPRESSION: "}" > : DEFAULT
| < DOT: "." >
| < GT1: ">" >
| < GT2: "gt" >
| < LT1: "<" >
| < LT2: "lt" >
| < EQ1: "==" >
| < EQ2: "eq" >
| < LE1: "<=" >
| < LE2: "le" >
| < GE1: ">=" >
| < GE2: "ge" >
| < NE1: "!=" >
| < NE2: "ne" >
| < LPAREN: "(" >
| < RPAREN: ")" >
| < COMMA: "," >
| < COLON: ":" >
| < LBRACKET: "[" >
| < RBRACKET: "]" >
| < PLUS: "+" >
| < MINUS: "-" >
| < MULTIPLY: "*" >
| < DIVIDE1: "/" >
| < DIVIDE2: "div" >
| < MODULUS1: "%" >
| < MODULUS2: "mod" >
| < NOT1: "not" >
| < NOT2: "!" >
| < AND1: "and" >
| < AND2: "&&" >
| < OR1: "or" >
| < OR2: "||" >
| < EMPTY: "empty" >
/* Identifiers */
| < IDENTIFIER: (|) (|)* >
| < #IMPL_OBJ_START: "#" >
|
< #LETTER:
[
"\u0024",
"\u0041"-"\u005a",
"\u005f",
"\u0061"-"\u007a",
"\u00c0"-"\u00d6",
"\u00d8"-"\u00f6",
"\u00f8"-"\u00ff",
"\u0100"-"\u1fff",
"\u3040"-"\u318f",
"\u3300"-"\u337f",
"\u3400"-"\u3d2d",
"\u4e00"-"\u9fff",
"\uf900"-"\ufaff"
]
>
|
< #DIGIT:
[
"\u0030"-"\u0039",
"\u0660"-"\u0669",
"\u06f0"-"\u06f9",
"\u0966"-"\u096f",
"\u09e6"-"\u09ef",
"\u0a66"-"\u0a6f",
"\u0ae6"-"\u0aef",
"\u0b66"-"\u0b6f",
"\u0be7"-"\u0bef",
"\u0c66"-"\u0c6f",
"\u0ce6"-"\u0cef",
"\u0d66"-"\u0d6f",
"\u0e50"-"\u0e59",
"\u0ed0"-"\u0ed9",
"\u1040"-"\u1049"
]
>
/* This is used to catch any non-matching tokens, so as to avoid any
TokenMgrErrors */
| < ILLEGAL_CHARACTER: (~[]) >
}
/*****************************************
* GRAMMAR PRODUCTIONS *
*****************************************/
/**
*
* Returns a String if the expression string is a single String, an
* Expression if the expression string is a single Expression, an
* ExpressionString if it's a mixture of both.
**/
Object ExpressionString () :
{
Object ret = "";
List elems = null;
Object elem;
}
{
/** Try to optimize for the case of a single expression or String **/
(ret = AttrValueString () | ret = AttrValueExpression ())
/** If there's more than one, then switch to using a List **/
(
(elem = AttrValueString () | elem = AttrValueExpression ())
{
if (elems == null) {
elems = new ArrayList ();
elems.add (ret);
}
elems.add (elem);
}
)*
{
if (elems != null) {
ret = new ExpressionString (elems.toArray ());
}
return ret;
}
}
String AttrValueString () :
{
Token t;
}
{
t =
{ return t.image; }
}
Expression AttrValueExpression () :
{
Expression exp;
}
{
exp = Expression ()
{ return exp; }
}
Expression Expression () :
{
Expression ret;
}
{
ret = OrExpression ()
{ return ret; }
}
Expression OrExpression () :
{
Expression startExpression;
BinaryOperator operator;
Expression expression;
List operators = null;
List expressions = null;
}
{
startExpression = AndExpression ()
(
(
( | ) { operator = OrOperator.SINGLETON; }
)
expression = AndExpression ()
{
if (operators == null) {
operators = new ArrayList ();
expressions = new ArrayList ();
}
operators.add (operator);
expressions.add (expression);
}
)*
{
if (operators != null) {
return new BinaryOperatorExpression (startExpression,
operators,
expressions);
}
else {
return startExpression;
}
}
}
Expression AndExpression () :
{
Expression startExpression;
BinaryOperator operator;
Expression expression;
List operators = null;
List expressions = null;
}
{
startExpression = EqualityExpression ()
(
(
( | ) { operator = AndOperator.SINGLETON; }
)
expression = EqualityExpression ()
{
if (operators == null) {
operators = new ArrayList ();
expressions = new ArrayList ();
}
operators.add (operator);
expressions.add (expression);
}
)*
{
if (operators != null) {
return new BinaryOperatorExpression (startExpression,
operators,
expressions);
}
else {
return startExpression;
}
}
}
Expression EqualityExpression () :
{
Expression startExpression;
BinaryOperator operator;
Expression expression;
List operators = null;
List expressions = null;
}
{
startExpression = RelationalExpression ()
(
(
( | ) { operator = EqualsOperator.SINGLETON; }
| ( | ) { operator = NotEqualsOperator.SINGLETON; }
)
expression = RelationalExpression ()
{
if (operators == null) {
operators = new ArrayList ();
expressions = new ArrayList ();
}
operators.add (operator);
expressions.add (expression);
}
)*
{
if (operators != null) {
return new BinaryOperatorExpression (startExpression,
operators,
expressions);
}
else {
return startExpression;
}
}
}
Expression RelationalExpression () :
{
Expression startExpression;
BinaryOperator operator;
Expression expression;
List operators = null;
List expressions = null;
}
{
startExpression = AddExpression ()
(
(
( | ) { operator = LessThanOperator.SINGLETON; }
| ( | ) { operator = GreaterThanOperator.SINGLETON; }
| ( | ) { operator = GreaterThanOrEqualsOperator.SINGLETON; }
| ( | ) { operator = LessThanOrEqualsOperator.SINGLETON; }
)
expression = AddExpression ()
{
if (operators == null) {
operators = new ArrayList ();
expressions = new ArrayList ();
}
operators.add (operator);
expressions.add (expression);
}
)*
{
if (operators != null) {
return new BinaryOperatorExpression (startExpression,
operators,
expressions);
}
else {
return startExpression;
}
}
}
Expression AddExpression () :
{
Expression startExpression;
BinaryOperator operator;
Expression expression;
List operators = null;
List expressions = null;
}
{
startExpression = MultiplyExpression ()
(
(
{ operator = PlusOperator.SINGLETON; }
| { operator = MinusOperator.SINGLETON; }
)
expression = MultiplyExpression ()
{
if (operators == null) {
operators = new ArrayList ();
expressions = new ArrayList ();
}
operators.add (operator);
expressions.add (expression);
}
)*
{
if (operators != null) {
return new BinaryOperatorExpression (startExpression,
operators,
expressions);
}
else {
return startExpression;
}
}
}
Expression MultiplyExpression () :
{
Expression startExpression;
BinaryOperator operator;
Expression expression;
List operators = null;
List expressions = null;
}
{
startExpression = UnaryExpression ()
(
(
{ operator = MultiplyOperator.SINGLETON; }
| ( | ) { operator = DivideOperator.SINGLETON; }
| ( | ) { operator = ModulusOperator.SINGLETON; }
)
expression = UnaryExpression ()
{
if (operators == null) {
operators = new ArrayList ();
expressions = new ArrayList ();
}
operators.add (operator);
expressions.add (expression);
}
)*
{
if (operators != null) {
return new BinaryOperatorExpression (startExpression,
operators,
expressions);
}
else {
return startExpression;
}
}
}
Expression UnaryExpression () :
{
Expression expression;
UnaryOperator singleOperator = null;
UnaryOperator operator;
List operators = null;
}
{
(
(
( | ) { operator = NotOperator.SINGLETON; }
| { operator = UnaryMinusOperator.SINGLETON; }
| { operator = EmptyOperator.SINGLETON; }
)
{
if (singleOperator == null) {
singleOperator = operator;
}
else if (operators == null) {
operators = new ArrayList ();
operators.add (singleOperator);
operators.add (operator);
}
else {
operators.add (operator);
}
}
)*
expression = Value ()
{
if (operators != null) {
return new UnaryOperatorExpression (null, operators, expression);
}
else if (singleOperator != null) {
return new UnaryOperatorExpression (singleOperator, null, expression);
}
else {
return expression;
}
}
}
Expression Value () :
{
Expression prefix;
ValueSuffix suffix;
List suffixes = null;
}
{
prefix = ValuePrefix ()
(suffix = ValueSuffix ()
{
if (suffixes == null) {
suffixes = new ArrayList ();
}
suffixes.add (suffix);
}
)*
{
if (suffixes == null) {
return prefix;
}
else {
return new ComplexValue (prefix, suffixes);
}
}
}
/**
* This is an element that can start a value
**/
Expression ValuePrefix () :
{
Expression ret;
}
{
(
ret = Literal ()
| ret = Expression ()
| LOOKAHEAD(QualifiedName() ) ret = FunctionInvocation ()
| ret = NamedValue ()
)
{ return ret; }
}
NamedValue NamedValue () :
{
Token t;
}
{
t = { return new NamedValue (t.image); }
}
FunctionInvocation FunctionInvocation () :
{
String qualifiedName;
List argumentList = new ArrayList();
Expression exp;
}
{
(
qualifiedName = QualifiedName()
(
(
exp = Expression ()
{
argumentList.add(exp);
}
)
(
exp = Expression ()
{
argumentList.add(exp);
}
)*
)?
)
{
String allowed = System.getProperty("javax.servlet.jsp.functions.allowed");
if (allowed == null || !allowed.equalsIgnoreCase("true"))
throw new ParseException("EL functions are not supported.");
return new FunctionInvocation(qualifiedName, argumentList);
}
}
ValueSuffix ValueSuffix () :
{
ValueSuffix suffix;
}
{
(
suffix = PropertySuffix ()
| suffix = ArraySuffix ()
)
{ return suffix; }
}
PropertySuffix PropertySuffix () :
{
Token t;
String property;
}
{
(property = Identifier ())
{
return new PropertySuffix (property);
}
}
ArraySuffix ArraySuffix () :
{
Expression index;
}
{
index = Expression ()
{
return new ArraySuffix (index);
}
}
Literal Literal () :
{
Literal ret;
}
{
(
ret = BooleanLiteral ()
| ret = IntegerLiteral ()
| ret = FloatingPointLiteral ()
| ret = StringLiteral ()
| ret = NullLiteral ()
)
{ return ret; }
}
BooleanLiteral BooleanLiteral () :
{
}
{
{ return BooleanLiteral.TRUE; }
| { return BooleanLiteral.FALSE; }
}
StringLiteral StringLiteral () :
{
Token t;
}
{
t =
{ return StringLiteral.fromToken (t.image); }
}
IntegerLiteral IntegerLiteral () :
{
Token t;
}
{
t =
{ return new IntegerLiteral (t.image); }
}
FloatingPointLiteral FloatingPointLiteral () :
{
Token t;
}
{
t =
{ return new FloatingPointLiteral (t.image); }
}
NullLiteral NullLiteral () :
{
}
{
{ return NullLiteral.SINGLETON; }
}
String Identifier () :
{
Token t;
}
{
(
t =
)
{ return t.image; }
}
String QualifiedName () :
{
String prefix = null, localPart = null;
}
{
(
(
LOOKAHEAD(Identifier() )
prefix = Identifier ()
)?
localPart = Identifier ()
)
{
if (prefix == null)
return localPart;
else
return prefix + ":" + localPart;
}
}