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Documentation

Index

• func Evaluate(inputExpr string, lookupFns ...VariableLookupFunction) (bool, error)
• func NullLookup(key string) (string, error)
• func Subst(inputExpr string, lookupFns ...VariableLookupFunction) (string, error)
• type VariableLookupFunction

Functions

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

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

Types

type VariableLookupFunction

type VariableLookupFunction func(key string) (string, error)

A VariableLookupFunction designates how variables should be resolved when evaluating expressions.