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Context Query Language (CQL)

This project defines a parser for the Context Query Language (CQL). CQL offers a declarative language for context activation to context-oriented languages

Syntactic Rules

The following summarize the semantics rules for the language

acivateStatement :: ("activate"|"deactivate")":"  (Expression (Connector Expression)*) (forStatement)?

forStatement :: "for:" Identifier

Expression ::  Identifier (BinaryExpression | PredicateExpression)?

BinaryExpression :: RelationalOperator Identifier

PredicateExpression :: Predicate"(" Identifier ("," Identifier)* ")"

Identifier :: [a-zA-Z]*

Integer :: [0-9]*

Predicate :: "between" | "atLeastOne" | "atMostOne" | "allOf" | "unique"

RelationalOperator :: "=" | "<" | ">"

Connector :: "and" | "or"

Examples

  • Activation of a Context with name ctx1 activate: name = "ctx1" activate: "ctx1"
  • Activation of all contexts in a given range for a specified property activate: date between(20170402, 20170320) Activates all contexts created in a date between the given dates.
  • Activation of a context for a particular object instance obj activate: name = "ctx1" for: obj
  • Activation of a context for all instances of a class clss activate: name = "ctx1" for: clss

Tests

All tests are executing using jest, by means of npm test