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.hibernate-core.4.2.12.Final.source-code.hql.g Maven / Gradle / Ivy
header
{
package org.hibernate.hql.internal.antlr;
import org.hibernate.hql.internal.ast.*;
import org.hibernate.hql.internal.ast.util.*;
}
/**
* Hibernate Query Language Grammar
* [email protected] )
*/
class HqlBaseParser extends Parser;
options
{
exportVocab=Hql;
buildAST=true;
k=3; // For 'not like', 'not in', etc.
}
tokens
{
// -- HQL Keyword tokens --
ALL="all";
ANY="any";
AND="and";
AS="as";
ASCENDING="asc";
AVG="avg";
BETWEEN="between";
CLASS="class";
COUNT="count";
DELETE="delete";
DESCENDING="desc";
DOT;
DISTINCT="distinct";
ELEMENTS="elements";
ESCAPE="escape";
EXISTS="exists";
FALSE="false";
FETCH="fetch";
FROM="from";
FULL="full";
GROUP="group";
HAVING="having";
IN="in";
INDICES="indices";
INNER="inner";
INSERT="insert";
INTO="into";
IS="is";
JOIN="join";
LEFT="left";
LIKE="like";
MAX="max";
MIN="min";
NEW="new";
NOT="not";
NULL="null";
OR="or";
ORDER="order";
OUTER="outer";
PROPERTIES="properties";
RIGHT="right";
SELECT="select";
SET="set";
SOME="some";
SUM="sum";
TRUE="true";
UNION="union";
UPDATE="update";
VERSIONED="versioned";
WHERE="where";
NULLS="nulls";
FIRST;
LAST;
// -- SQL tokens --
// These aren't part of HQL, but the SQL fragment parser uses the HQL lexer, so they need to be declared here.
CASE="case"; // a "searched case statement", whereas CASE2 represents a "simple case statement"
END="end";
ELSE="else";
THEN="then";
WHEN="when";
ON="on";
WITH="with";
// -- JPAQL tokens --
BOTH="both";
EMPTY="empty";
LEADING="leading";
MEMBER="member";
OBJECT="object";
OF="of";
TRAILING="trailing";
KEY;
VALUE;
ENTRY;
// -- Synthetic token types --
AGGREGATE; // One of the aggregate functions (e.g. min, max, avg)
ALIAS;
CONSTRUCTOR;
CASE2; // a "simple case statement", whereas CASE represents a "searched case statement"
CAST;
EXPR_LIST;
FILTER_ENTITY; // FROM element injected because of a filter expression (happens during compilation phase 2)
IN_LIST;
INDEX_OP;
IS_NOT_NULL;
IS_NULL; // Unary 'is null' operator.
METHOD_CALL;
NOT_BETWEEN;
NOT_IN;
NOT_LIKE;
ORDER_ELEMENT;
QUERY;
RANGE;
ROW_STAR;
SELECT_FROM;
UNARY_MINUS;
UNARY_PLUS;
VECTOR_EXPR; // ( x, y, z )
WEIRD_IDENT; // Identifiers that were keywords when they came in.
// Literal tokens.
CONSTANT;
NUM_DOUBLE;
NUM_FLOAT;
NUM_LONG;
NUM_BIG_INTEGER;
NUM_BIG_DECIMAL;
JAVA_CONSTANT;
}
{
/** True if this is a filter query (allow no FROM clause). **/
private boolean filter = false;
/**
* Sets the filter flag.
* @param f True for a filter query, false for a normal query.
*/
public void setFilter(boolean f) {
filter = f;
}
/**
* Returns true if this is a filter query, false if not.
* @return true if this is a filter query, false if not.
*/
public boolean isFilter() {
return filter;
}
/**
* This method is overriden in the sub class in order to provide the
* 'keyword as identifier' hack.
* @param token The token to retry as an identifier.
* @param ex The exception to throw if it cannot be retried as an identifier.
*/
public AST handleIdentifierError(Token token,RecognitionException ex) throws RecognitionException, TokenStreamException {
// Base implementation: Just re-throw the exception.
throw ex;
}
/**
* This method looks ahead and converts . into . IDENT when
* appropriate.
*/
public void handleDotIdent() throws TokenStreamException {
}
/**
* Returns the negated equivalent of the expression.
* @param x The expression to negate.
*/
public AST negateNode(AST x) {
// Just create a 'not' parent for the default behavior.
return ASTUtil.createParent(astFactory, NOT, "not", x);
}
/**
* Returns the 'cleaned up' version of a comparison operator sub-tree.
* @param x The comparison operator to clean up.
*/
public AST processEqualityExpression(AST x) throws RecognitionException {
return x;
}
public void weakKeywords() throws TokenStreamException { }
public void processMemberOf(Token n,AST p,ASTPair currentAST) { }
protected boolean validateSoftKeyword(String text) throws TokenStreamException {
return validateLookAheadText(1, text);
}
protected boolean validateLookAheadText(int lookAheadPosition, String text) throws TokenStreamException {
String text2Validate = retrieveLookAheadText( lookAheadPosition );
return text2Validate == null ? false : text2Validate.equalsIgnoreCase( text );
}
protected String retrieveLookAheadText(int lookAheadPosition) throws TokenStreamException {
Token token = LT(lookAheadPosition);
return token == null ? null : token.getText();
}
}
statement
: ( updateStatement | deleteStatement | selectStatement | insertStatement )
;
updateStatement
: UPDATE^ (VERSIONED)?
optionalFromTokenFromClause
setClause
(whereClause)?
;
setClause
: (SET^ assignment (COMMA! assignment)*)
;
assignment
: stateField EQ^ newValue
;
// "state_field" is the term used in the EJB3 sample grammar; used here for easy reference.
// it is basically a property ref
stateField
: path
;
// this still needs to be defined in the ejb3 spec; additiveExpression is currently just a best guess,
// although it is highly likely I would think that the spec may limit this even more tightly.
newValue
: concatenation
;
deleteStatement
: DELETE^
(optionalFromTokenFromClause)
(whereClause)?
;
optionalFromTokenFromClause!
: (FROM!)? f:path (a:asAlias)? {
AST #range = #([RANGE, "RANGE"], #f, #a);
#optionalFromTokenFromClause = #([FROM, "FROM"], #range);
}
;
selectStatement
: queryRule {
#selectStatement = #([QUERY,"query"], #selectStatement);
}
;
insertStatement
// Would be nice if we could abstract the FromClause/FromElement logic
// out such that it could be reused here; something analogous to
// a "table" rule in sql-grammars
: INSERT^ intoClause selectStatement
;
intoClause
: INTO^ path { weakKeywords(); } insertablePropertySpec
;
insertablePropertySpec
: OPEN! primaryExpression ( COMMA! primaryExpression )* CLOSE! {
// Just need *something* to distinguish this on the hql-sql.g side
#insertablePropertySpec = #([RANGE, "column-spec"], #insertablePropertySpec);
}
;
union
: queryRule (UNION queryRule)*
;
//## query:
//## [selectClause] fromClause [whereClause] [groupByClause] [havingClause] [orderByClause];
queryRule
: selectFrom
(whereClause)?
(groupByClause)?
(orderByClause)?
;
selectFrom!
: (s:selectClause)? (f:fromClause)? {
// If there was no FROM clause and this is a filter query, create a from clause. Otherwise, throw
// an exception because non-filter queries must have a FROM clause.
if (#f == null) {
if (filter) {
#f = #([FROM,"{filter-implied FROM}"]);
}
else
throw new SemanticException("FROM expected (non-filter queries must contain a FROM clause)");
}
// Create an artificial token so the 'FROM' can be placed
// before the SELECT in the tree to make tree processing
// simpler.
#selectFrom = #([SELECT_FROM,"SELECT_FROM"],f,s);
}
;
//## selectClause:
//## SELECT DISTINCT? selectedPropertiesList | ( NEW className OPEN selectedPropertiesList CLOSE );
selectClause
: SELECT^ // NOTE: The '^' after a token causes the corresponding AST node to be the root of the sub-tree.
{ weakKeywords(); } // Weak keywords can appear immediately after a SELECT token.
(DISTINCT)? ( selectedPropertiesList | newExpression | selectObject )
;
newExpression
: (NEW! path) op:OPEN^ {#op.setType(CONSTRUCTOR);} selectedPropertiesList CLOSE!
;
selectObject
: OBJECT^ OPEN! identifier CLOSE!
;
//## fromClause:
//## FROM className AS? identifier ( ( COMMA className AS? identifier ) | ( joinType path AS? identifier ) )*;
// NOTE: This *must* begin with the "FROM" token, otherwise the sub-query rule will be ambiguous
// with the expression rule.
// Also note: after a comma weak keywords are allowed and should be treated as identifiers.
fromClause
: FROM^ { weakKeywords(); } fromRange ( fromJoin | COMMA! { weakKeywords(); } fromRange )*
;
//## joinType:
//## ( ( 'left'|'right' 'outer'? ) | 'full' | 'inner' )? JOIN FETCH?;
fromJoin
: ( ( ( LEFT | RIGHT ) (OUTER)? ) | FULL | INNER )? JOIN^ (FETCH)?
path (asAlias)? (propertyFetch)? (withClause)?
;
withClause
: WITH^ logicalExpression
;
fromRange
: fromClassOrOuterQueryPath
| inClassDeclaration
| inCollectionDeclaration
| inCollectionElementsDeclaration
;
fromClassOrOuterQueryPath!
: c:path { weakKeywords(); } (a:asAlias)? (p:propertyFetch)? {
#fromClassOrOuterQueryPath = #([RANGE, "RANGE"], #c, #a, #p);
}
;
inClassDeclaration!
: a:alias IN! CLASS! c:path {
#inClassDeclaration = #([RANGE, "RANGE"], #c, #a);
}
;
inCollectionDeclaration!
: IN! OPEN! p:path CLOSE! a:asAlias {
#inCollectionDeclaration = #([JOIN, "join"], [INNER, "inner"], #p, #a);
}
;
inCollectionElementsDeclaration!
: a:alias IN! ELEMENTS! OPEN! p:path CLOSE! {
#inCollectionElementsDeclaration = #([JOIN, "join"], [INNER, "inner"], #p, #a);
}
;
// Alias rule - Parses the optional 'as' token and forces an AST identifier node.
asAlias
: (AS!)? alias
;
alias
: a:identifier { #a.setType(ALIAS); }
;
propertyFetch
: FETCH ALL! PROPERTIES!
;
//## groupByClause:
//## GROUP_BY path ( COMMA path )*;
groupByClause
: GROUP^
"by"! expression ( COMMA! expression )*
(havingClause)?
;
//## orderByClause:
//## ORDER_BY selectedPropertiesList;
orderByClause
: ORDER^ "by"! orderElement ( COMMA! orderElement )*
;
orderElement
: expression ( ascendingOrDescending )? ( nullOrdering )?
;
ascendingOrDescending
: ( "asc" | "ascending" ) { #ascendingOrDescending.setType(ASCENDING); }
| ( "desc" | "descending") { #ascendingOrDescending.setType(DESCENDING); }
;
nullOrdering
: NULLS nullPrecedence
;
nullPrecedence
: IDENT {
if ( "first".equalsIgnoreCase( #nullPrecedence.getText() ) ) {
#nullPrecedence.setType( FIRST );
}
else if ( "last".equalsIgnoreCase( #nullPrecedence.getText() ) ) {
#nullPrecedence.setType( LAST );
}
else {
throw new SemanticException( "Expecting 'first' or 'last', but found '" + #nullPrecedence.getText() + "' as null ordering precedence." );
}
}
;
//## havingClause:
//## HAVING logicalExpression;
havingClause
: HAVING^ logicalExpression
;
//## whereClause:
//## WHERE logicalExpression;
whereClause
: WHERE^ logicalExpression
;
//## selectedPropertiesList:
//## ( path | aggregate ) ( COMMA path | aggregate )*;
selectedPropertiesList
: aliasedExpression ( COMMA! aliasedExpression )*
;
aliasedExpression
: expression ( AS^ identifier )?
;
// expressions
// Note that most of these expressions follow the pattern
// thisLevelExpression :
// nextHigherPrecedenceExpression
// (OPERATOR nextHigherPrecedenceExpression)*
// which is a standard recursive definition for a parsing an expression.
//
// Operator precedence in HQL
// lowest --> ( 7) OR
// ( 6) AND, NOT
// ( 5) equality: ==, <>, !=, is
// ( 4) relational: <, <=, >, >=,
// LIKE, NOT LIKE, BETWEEN, NOT BETWEEN, IN, NOT IN
// ( 3) addition and subtraction: +(binary) -(binary)
// ( 2) multiplication: * / %, concatenate: ||
// highest --> ( 1) +(unary) -(unary)
// [] () (method call) . (dot -- identifier qualification)
// aggregate function
// () (explicit parenthesis)
//
// Note that the above precedence levels map to the rules below...
// Once you have a precedence chart, writing the appropriate rules as below
// is usually very straightfoward
logicalExpression
: expression
;
// Main expression rule
expression
: logicalOrExpression
;
// level 7 - OR
logicalOrExpression
: logicalAndExpression ( OR^ logicalAndExpression )*
;
// level 6 - AND, NOT
logicalAndExpression
: negatedExpression ( AND^ negatedExpression )*
;
// NOT nodes aren't generated. Instead, the operator in the sub-tree will be
// negated, if possible. Expressions without a NOT parent are passed through.
negatedExpression!
{ weakKeywords(); } // Weak keywords can appear in an expression, so look ahead.
: NOT^ x:negatedExpression { #negatedExpression = negateNode(#x); }
| y:equalityExpression { #negatedExpression = #y; }
;
//## OP: EQ | LT | GT | LE | GE | NE | SQL_NE | LIKE;
// level 5 - EQ, NE
equalityExpression
: x:relationalExpression (
( EQ^
| is:IS^ { #is.setType(EQ); } (NOT! { #is.setType(NE); } )?
| NE^
| ne:SQL_NE^ { #ne.setType(NE); }
) y:relationalExpression)* {
// Post process the equality expression to clean up 'is null', etc.
#equalityExpression = processEqualityExpression(#equalityExpression);
}
;
// level 4 - LT, GT, LE, GE, LIKE, NOT LIKE, BETWEEN, NOT BETWEEN
// NOTE: The NOT prefix for LIKE and BETWEEN will be represented in the
// token type. When traversing the AST, use the token type, and not the
// token text to interpret the semantics of these nodes.
relationalExpression
: concatenation (
( ( ( LT^ | GT^ | LE^ | GE^ ) additiveExpression )* )
// Disable node production for the optional 'not'.
| (n:NOT!)? (
// Represent the optional NOT prefix using the token type by
// testing 'n' and setting the token type accordingly.
(i:IN^ {
#i.setType( (n == null) ? IN : NOT_IN);
#i.setText( (n == null) ? "in" : "not in");
}
inList)
| (b:BETWEEN^ {
#b.setType( (n == null) ? BETWEEN : NOT_BETWEEN);
#b.setText( (n == null) ? "between" : "not between");
}
betweenList )
| (l:LIKE^ {
#l.setType( (n == null) ? LIKE : NOT_LIKE);
#l.setText( (n == null) ? "like" : "not like");
}
concatenation likeEscape)
| (MEMBER! (OF!)? p:path! {
processMemberOf(n,#p,currentAST);
} ) )
)
;
likeEscape
: (ESCAPE^ concatenation)?
;
inList
: x:compoundExpr
{ #inList = #([IN_LIST,"inList"], #inList); }
;
betweenList
: concatenation AND! concatenation
;
//level 4 - string concatenation
concatenation
: additiveExpression
( c:CONCAT^ { #c.setType(EXPR_LIST); #c.setText("concatList"); }
additiveExpression
( CONCAT! additiveExpression )*
{ #concatenation = #([METHOD_CALL, "||"], #([IDENT, "concat"]), #c ); } )?
;
// level 3 - binary plus and minus
additiveExpression
: multiplyExpression ( ( PLUS^ | MINUS^ ) multiplyExpression )*
;
// level 2 - binary multiply and divide
multiplyExpression
: unaryExpression ( ( STAR^ | DIV^ | MOD^ ) unaryExpression )*
;
// level 1 - unary minus, unary plus, not
unaryExpression
: MINUS^ {#MINUS.setType(UNARY_MINUS);} unaryExpression
| PLUS^ {#PLUS.setType(UNARY_PLUS);} unaryExpression
| caseExpression
| quantifiedExpression
| atom
;
caseExpression
: CASE^ (whenClause)+ (elseClause)? END!
| CASE^ { #CASE.setType(CASE2); } unaryExpression (altWhenClause)+ (elseClause)? END!
;
whenClause
: (WHEN^ logicalExpression THEN! unaryExpression)
;
altWhenClause
: (WHEN^ unaryExpression THEN! unaryExpression)
;
elseClause
: (ELSE^ unaryExpression)
;
quantifiedExpression
: ( SOME^ | EXISTS^ | ALL^ | ANY^ )
( identifier | collectionExpr | (OPEN! ( subQuery ) CLOSE!) )
;
// level 0 - expression atom
// ident qualifier ('.' ident ), array index ( [ expr ] ),
// method call ( '.' ident '(' exprList ') )
atom
: { validateSoftKeyword("cast") && LA(2) == OPEN }? castFunction
| primaryExpression
(
DOT^ identifier
( options { greedy=true; } :
( op:OPEN^ {#op.setType(METHOD_CALL);} exprList CLOSE! ) )?
| lb:OPEN_BRACKET^ {#lb.setType(INDEX_OP);} expression CLOSE_BRACKET!
)*
;
castFunction!
: c:IDENT OPEN e:expression (AS)? t:castTargetType CLOSE {
#c.setType( CAST );
#castFunction = #( #c, #e, #t );
}
;
castTargetType
// the cast target type is Hibernate type name which is either:
// 1) a simple identifier
// 2) a simple identifier-(dot-identifier)* sequence
: identifier { handleDotIdent(); } ( options { greedy=true; } : DOT^ identifier )*
;
// level 0 - the basic element of an expression
primaryExpression
: identPrimary ( options {greedy=true;} : DOT^ "class" )?
| constant
| parameter
// TODO: Add parens to the tree so the user can control the operator evaluation order.
| OPEN! (expressionOrVector | subQuery) CLOSE!
;
parameter
: COLON^ identifier
| PARAM^ (NUM_INT)?
;
// This parses normal expression and a list of expressions separated by commas. If a comma is encountered
// a parent VECTOR_EXPR node will be created for the list.
expressionOrVector!
: e:expression ( v:vectorExpr )? {
// If this is a vector expression, create a parent node for it.
if (#v != null)
#expressionOrVector = #([VECTOR_EXPR,"{vector}"], #e, #v);
else
#expressionOrVector = #e;
}
;
vectorExpr
: COMMA! expression (COMMA! expression)*
;
// identifier, followed by member refs (dot ident), or method calls.
// NOTE: handleDotIdent() is called immediately after the first IDENT is recognized because
// the method looks a head to find keywords after DOT and turns them into identifiers.
identPrimary
: i:identifier { handleDotIdent(); }
( options { greedy=true; } : DOT^ ( identifier | ELEMENTS | o:OBJECT { #o.setType(IDENT); } ) )*
( options { greedy=true; } :
( op:OPEN^ { #op.setType(METHOD_CALL);} e:exprList CLOSE! ) {
AST path = #e.getFirstChild();
if ( #i.getText().equalsIgnoreCase( "key" ) ) {
#identPrimary = #( [KEY], path );
}
else if ( #i.getText().equalsIgnoreCase( "value" ) ) {
#identPrimary = #( [VALUE], path );
}
else if ( #i.getText().equalsIgnoreCase( "entry" ) ) {
#identPrimary = #( [ENTRY], path );
}
}
)?
// Also allow special 'aggregate functions' such as count(), avg(), etc.
| aggregate
;
aggregate
: ( SUM^ | AVG^ | MAX^ | MIN^ ) OPEN! additiveExpression CLOSE! { #aggregate.setType(AGGREGATE); }
// Special case for count - It's 'parameters' can be keywords.
| COUNT^ OPEN! ( STAR { #STAR.setType(ROW_STAR); } | ( ( DISTINCT | ALL )? ( path | collectionExpr | caseExpression ) ) ) CLOSE!
| collectionExpr
;
//## collection: ( OPEN query CLOSE ) | ( 'elements'|'indices' OPEN path CLOSE );
collectionExpr
: (ELEMENTS^ | INDICES^) OPEN! path CLOSE!
;
// NOTE: compoundExpr can be a 'path' where the last token in the path is '.elements' or '.indicies'
compoundExpr
: collectionExpr
| path
| { LA(1) == OPEN && LA(2) == CLOSE }? OPEN! CLOSE!
| (OPEN! ( (expression (COMMA! expression)*) | subQuery ) CLOSE!)
| parameter
;
subQuery
: union
{ #subQuery = #([QUERY,"query"], #subQuery); }
;
exprList
{
AST trimSpec = null;
}
: (t:TRAILING {#trimSpec = #t;} | l:LEADING {#trimSpec = #l;} | b:BOTH {#trimSpec = #b;})?
{ if(#trimSpec != null) #trimSpec.setType(IDENT); }
(
expression ( (COMMA! expression)+ | FROM { #FROM.setType(IDENT); } expression | AS! identifier )?
| FROM { #FROM.setType(IDENT); } expression
)?
{ #exprList = #([EXPR_LIST,"exprList"], #exprList); }
;
constant
: NUM_INT
| NUM_FLOAT
| NUM_LONG
| NUM_DOUBLE
| NUM_BIG_INTEGER
| NUM_BIG_DECIMAL
| QUOTED_STRING
| NULL
| TRUE
| FALSE
| EMPTY
;
//## quantifiedExpression: 'exists' | ( expression 'in' ) | ( expression OP 'any' | 'some' ) collection;
//## compoundPath: path ( OPEN_BRACKET expression CLOSE_BRACKET ( '.' path )? )*;
//## path: identifier ( '.' identifier )*;
path
: identifier ( DOT^ { weakKeywords(); } identifier )*
;
// Wraps the IDENT token from the lexer, in order to provide
// 'keyword as identifier' trickery.
identifier
: IDENT
exception
catch [RecognitionException ex]
{
identifier_AST = handleIdentifierError(LT(1),ex);
}
;
// **** LEXER ******************************************************************
/**
* Hibernate Query Language Lexer
* [email protected] )
*/
class HqlBaseLexer extends Lexer;
options {
exportVocab=Hql; // call the vocabulary "Hql"
testLiterals = false;
k=2; // needed for newline, and to distinguish '>' from '>='.
// HHH-241 : Quoted strings don't allow unicode chars - This should fix it.
charVocabulary='\u0000'..'\uFFFE'; // Allow any char but \uFFFF (16 bit -1, ANTLR's EOF character)
caseSensitive = false;
caseSensitiveLiterals = false;
}
// -- Declarations --
{
// NOTE: The real implementations are in the subclass.
protected void setPossibleID(boolean possibleID) {}
}
// -- Keywords --
EQ: '=';
LT: '<';
GT: '>';
SQL_NE: "<>";
NE: "!=" | "^=";
LE: "<=";
GE: ">=";
COMMA: ',';
OPEN: '(';
CLOSE: ')';
OPEN_BRACKET: '[';
CLOSE_BRACKET: ']';
CONCAT: "||";
PLUS: '+';
MINUS: '-';
STAR: '*';
DIV: '/';
MOD: '%';
COLON: ':';
PARAM: '?';
IDENT options { testLiterals=true; }
: ID_START_LETTER ( ID_LETTER )*
{
// Setting this flag allows the grammar to use keywords as identifiers, if necessary.
setPossibleID(true);
}
;
protected
ID_START_LETTER
: '_'
| '$'
| 'a'..'z'
| '\u0080'..'\ufffe' // HHH-558 : Allow unicode chars in identifiers
;
protected
ID_LETTER
: ID_START_LETTER
| '0'..'9'
;
QUOTED_STRING
: '\'' ( (ESCqs)=> ESCqs | ~'\'' )* '\''
;
protected
ESCqs
:
'\'' '\''
;
WS : ( ' '
| '\t'
| '\r' '\n' { newline(); }
| '\n' { newline(); }
| '\r' { newline(); }
)
{$setType(Token.SKIP);} //ignore this token
;
//--- From the Java example grammar ---
// a numeric literal
NUM_INT
{boolean isDecimal=false; Token t=null;}
: '.' {_ttype = DOT;}
( ('0'..'9')+ (EXPONENT)? (f1:FLOAT_SUFFIX {t=f1;})?
{
if ( t != null && t.getText().toUpperCase().indexOf("BD")>=0) {
_ttype = NUM_BIG_DECIMAL;
}
else if (t != null && t.getText().toUpperCase().indexOf('F')>=0) {
_ttype = NUM_FLOAT;
}
else {
_ttype = NUM_DOUBLE; // assume double
}
}
)?
| ( '0' {isDecimal = true;} // special case for just '0'
( ('x')
( // hex
// the 'e'|'E' and float suffix stuff look
// like hex digits, hence the (...)+ doesn't
// know when to stop: ambig. ANTLR resolves
// it correctly by matching immediately. It
// is therefore ok to hush warning.
options { warnWhenFollowAmbig=false; }
: HEX_DIGIT
)+
| ('0'..'7')+ // octal
)?
| ('1'..'9') ('0'..'9')* {isDecimal=true;} // non-zero decimal
)
( ('l') { _ttype = NUM_LONG; }
| ('b''i') { _ttype = NUM_BIG_INTEGER; }
// only check to see if it's a float if looks like decimal so far
| {isDecimal}?
( '.' ('0'..'9')* (EXPONENT)? (f2:FLOAT_SUFFIX {t=f2;})?
| EXPONENT (f3:FLOAT_SUFFIX {t=f3;})?
| f4:FLOAT_SUFFIX {t=f4;}
)
{
if ( t != null && t.getText().toUpperCase().indexOf("BD")>=0) {
_ttype = NUM_BIG_DECIMAL;
}
else if (t != null && t.getText().toUpperCase() .indexOf('F') >= 0) {
_ttype = NUM_FLOAT;
}
else {
_ttype = NUM_DOUBLE; // assume double
}
}
)?
;
// hexadecimal digit (again, note it's protected!)
protected
HEX_DIGIT
: ('0'..'9'|'a'..'f')
;
// a couple protected methods to assist in matching floating point numbers
protected
EXPONENT
: ('e') ('+'|'-')? ('0'..'9')+
;
protected
FLOAT_SUFFIX
: 'f'|'d'|'b''d'
;
