Library: OSP
Package: Util
Header: Poco/OSP/QLParser.h
Description
QLParser implements a parser for property query expressions, such as used by the ServiceRegistry.
Member Summary
Member Functions: isRelOp, parse, parseAndExpr, parseExpr, parseRelExpr, token2value
Constructors
QLParser
QLParser(
const std::string & expr
);
Creates the QLParser for parsing the given expression.
Destructor
~QLParser
~QLParser();
Destroys the QLParser.
Member Functions
parse
QLExpr::Ptr parse();
Parses the expression.
Throws a SyntaxExpression if the expression is not valid.
The language syntax is as follows:
expr ::= andExpr ["||" andExpr]
andExpr ::= relExpr ["&&" relExpr]
relExpr ::= ["!"] (id [relOp value | "=~" matchExpr]) | subExpr
subExpr ::= "(" expr ")"
relOp ::= "==" | "!=" | "<" | "<=" | ">" | ">="
value ::= numLiteral | boolLiteral | stringLiteral
numLiteral ::= [sign] digit*"."digit*["E"["+" | "-"]digit*]
boolLiteral ::= "true" | "false"
stringLiteral ::= """ char* """
matchExpr ::= stringLiteral | regExpr
regExpr ::= delim char+ delim /* valid Perl regular expression,
enclosed in delim */
delim ::= "/" | "#"
isRelOp 
bool isRelOp(
const Poco::Token * token
);
parseAndExpr
const Poco::Token * parseAndExpr(
const Poco::Token * next,
QLExpr::Ptr & pExpr
);
parseExpr
const Poco::Token * parseExpr(
const Poco::Token * next,
QLExpr::Ptr & pExpr
);
parseRelExpr
const Poco::Token * parseRelExpr(
const Poco::Token * next,
QLExpr::Ptr & pExpr
);
token2value
Poco::Any token2value(
const Poco::Token * token
);