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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* @author Simon Thoresen Hult
*/
options {
CACHE_TOKENS = true;
DEBUG_PARSER = false;
ERROR_REPORTING = true;
IGNORE_CASE = true;
STATIC = false;
UNICODE_INPUT = true;
USER_CHAR_STREAM = true;
USER_TOKEN_MANAGER = false;
}
PARSER_BEGIN(SelectParser)
package com.yahoo.document.select.parser;
import com.yahoo.document.select.rule.*;
import java.math.BigInteger;
import java.util.List;
import java.util.ArrayList;
public class SelectParser {
}
PARSER_END(SelectParser)
SKIP :
{
" " | "\f" | "\n" | "\r" | "\t"
}
TOKEN :
{
<INTEGER: <DECIMAL> (["l","L"])? | <HEX> (["l","L"])? | <OCTAL> (["l","L"])?> |
<#DECIMAL: ["1"-"9"] (["0"-"9"])*> |
<#HEX: "0" ["x","X"] (["0"-"9","a"-"f","A"-"F"])+> |
<#OCTAL: "0" (["0"-"7"])*> |
<FLOAT: (["0"-"9"])+ ("." (["0"-"9"])*)? (<EXPONENT>)? (["f","F","d","D"])?> |
<#EXPONENT: ["e","E"] (["+","-"])? (["0"-"9"])+>
}
TOKEN :
{
<LBRACE: "("> |
<RBRACE: ")"> |
<ADD: "+"> |
<SUB: "-"> |
<MUL: "*"> |
<DIV: "/"> |
<MOD: "%"> |
<DOT: "."> |
<COMMA: ","> |
<NE: "!="> |
<GE: ">="> |
<LE: "<="> |
<REGEX: "=~"> |
<EQ: "=="> |
<GLOB: "="> |
<GT: ">"> |
<LT: "<"> |
<DOLLAR: "$"> |
<STRING: ("\"" (~["\""] | "\\\"")* "\"") |
("'" (~["'"] | "\\'")* "'")> |
<ID: "id"> |
<ID_SCHEME: "scheme"> |
<ID_TYPE: "type"> |
<ID_NAMESPACE: "namespace"> |
<ID_SPECIFIC: "specific"> |
<ID_USER: "user"> |
<ID_GROUP: "group"> |
<ID_BUCKET: "bucket"> |
<NULL: "null"> |
<NOW: "now"> |
<TRUE: "true"> |
<FALSE: "false"> |
<AND: "and"> |
<OR: "or"> |
<NOT: "not"> |
<IDENTIFIER: ["a"-"z","A"-"Z", "_"] (["a"-"z","A"-"Z","0"-"9","_","-","@","$","[","]","{","}"])*>
}
ExpressionNode expression() :
{
ExpressionNode ret = new LiteralNode(true);
}
{
( [ ret = logic() ] <EOF> )
{ return ret; }
}
ExpressionNode logic() :
{
LogicNode lst = new LogicNode();
String op = null;
ExpressionNode node;
}
{
( node = negation() { lst.add(null, node); }
( ( <AND> | <OR> ) { op = token.image; }
node = negation() { lst.add(op, node); } )* )
{ return op != null ? lst : node; }
}
ExpressionNode negation() :
{
boolean not = false;
ExpressionNode node;
}
{
( [ <NOT> { not = true; } ] node = relational() )
{ return not ? new NegationNode(node) : node; }
}
NowNode now() : { }
{
( <NOW> <LBRACE> <RBRACE> )
{ return new NowNode(); }
}
ExpressionNode relational() :
{
ExpressionNode lhs, rhs = null;
String op = null;
}
{
( lhs = arithmetic()
[ ( <EQ> | <NE> | <LT> | <GT> | <LE> | <GE> | <REGEX> | <GLOB> ) { op = token.image; }
rhs = arithmetic() ] )
{ return rhs != null ? new ComparisonNode(lhs, op, rhs) : lhs; }
}
ExpressionNode arithmetic() :
{
ArithmeticNode lst = new ArithmeticNode();
String op = null;
ExpressionNode node;
}
{
( node = attribute() { lst.add(null, node); }
( ( <ADD> | <SUB> | <DIV> | <MUL> | <MOD> ) { op = token.image; }
node = attribute() { lst.add(op, node); } )* )
{ return op != null ? lst : node; }
}
VariableNode variable() :
{
VariableNode ret;
}
{
( <DOLLAR> identifier() { ret = new VariableNode(token.image); } )
{ return ret; }
}
ExpressionNode attribute() :
{
ExpressionNode value;
AttributeNode.Item item;
List items = new ArrayList();
}
{
( value = value() ( <DOT> identifier() { item = new AttributeNode.Item(token.image); }
[ <LBRACE> <RBRACE> { item.setType(AttributeNode.Item.FUNCTION); } ]
{ items.add(item); } )* )
{
if ( ! items.isEmpty()) // A value followed by dotted access/method call
return new AttributeNode(value, items);
if (value instanceof DocumentNode) // A standalone document type access: Convert to exact type matching
return new DocumentTypeNode(((DocumentNode)value).getType());
return value;
}
}
ExpressionNode value() :
{
ExpressionNode ret;
}
{
( LOOKAHEAD(2)
( ret = id() |
ret = literal() |
ret = variable() |
ret = now() |
<LBRACE> ret = logic() <RBRACE> { ret = new EmbracedNode(ret); } ) |
( ret = document() ) )
{ return ret; }
}
DocumentNode document() :
{
DocumentNode ret;
}
{
( identifier() { ret = new DocumentNode(token.image); } )
{ return ret; }
}
void identifier() : { }
{
( <ID> |
<ID_SCHEME> |
<ID_TYPE> |
<ID_NAMESPACE> |
<ID_SPECIFIC> |
<ID_USER> |
<ID_GROUP> |
<ID_BUCKET> |
<NULL> |
<NOW> |
<TRUE> |
<FALSE> |
<AND> |
<OR> |
// <NOT> | Causes a choice conflict, but it is not such a good name anyway ...
<IDENTIFIER> )
}
IdNode id() :
{
IdNode ret = new IdNode();
}
{
( <ID> [ LOOKAHEAD(2) <DOT>
( <ID_SCHEME> { ret.setField(token.image); } |
<ID_TYPE> { ret.setField(token.image); } |
<ID_NAMESPACE> { ret.setField(token.image); } |
<ID_SPECIFIC> { ret.setField(token.image); } |
<ID_USER> { ret.setField(token.image); } |
<ID_GROUP> { ret.setField(token.image); } |
<ID_BUCKET> { ret.setField(token.image); } )
] )
{ return ret; }
}
LiteralNode literal() :
{
String sign = "";
Object ret = null;
}
{
( ( [ <SUB> { sign = "-"; } ]
( <FLOAT> { ret = Double.parseDouble(sign + token.image); } |
<INTEGER> { ret = SelectParserUtils.decodeLong(sign + token.image); } ) ) |
( <ADD> <FLOAT> { ret = Double.parseDouble(token.image); } ) |
( <STRING> { ret = SelectParserUtils.unquote(token.image); } ) |
( <TRUE> { ret = true; } ) |
( <FALSE> { ret = false; } ) |
( <NULL> { ret = null; } ) )
{ return new LiteralNode(ret); }
}
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