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func Evaluate ¶

func Evaluate(inputExpr string, lookupFns ...VariableLookupFunction) (bool, error)

Evaluate evaluates an input expression. Expressions are groups of string values combined with equal or unequal comparators. The order of comparison operations can be designated using groups enclosed inside parenthesis. An optional VariableLookupFunction can be provided to provide variable lookups.

func NullLookup ¶

func NullLookup(key string) (string, error)

NullLookup returns an empty value for any requested variable and does not return an error. This is the default variable lookup function used by Evaluate.

func Subst ¶ added in v0.3.0

func Subst(inputExpr string, lookupFns ...VariableLookupFunction) (string, error)