stateful

package
v1.5.5 Latest Latest
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 Go to latest Published: Apr 17, 2020 License: MIT Imports: 13 Imported by: 0

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Constants

This section is empty.

Variables

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var ErrNotFloat = errors.New("value is not a float")

Functions

This section is empty.

Types

type Domain added in v1.3.0 

type Domain [maxArgs]ast.ValueType

func (Domain) String added in v1.3.0 

func (d Domain) String() string

type Domains added in v1.3.0 

type Domains []Domain

func FuncDomains added in v1.3.0 

func FuncDomains(f Func) Domains

func (Domains) String added in v1.3.0 

func (ds Domains) String() string

type DynamicFunc added in v1.3.0 

type DynamicFunc struct {
	F   func(args ...interface{}) (interface{}, error)
	Sig map[Domain]ast.ValueType
}

func (DynamicFunc) Call added in v1.3.0 

func (df DynamicFunc) Call(args ...interface{}) (interface{}, error)

func (DynamicFunc) Reset added in v1.3.0 

func (df DynamicFunc) Reset()

func (DynamicFunc) Signature added in v1.3.0 

func (df DynamicFunc) Signature() map[Domain]ast.ValueType

type DynamicMethod added in v1.0.0 

type DynamicMethod func(self interface{}, args ...interface{}) (interface{}, error)

type ErrMissingType added in v1.4.0 

type ErrMissingType struct {
	Name  string
	Args  []string
	Scope []string
}

func (ErrMissingType) Error added in v1.4.0 

func (e ErrMissingType) Error() string

type ErrSide 

type ErrSide struct {
	IsLeft  bool
	IsRight bool
	// contains filtered or unexported fields
}

ErrSide wraps the error in the evaluation, we use this error to indicate the origin of the error left side or right side

type ErrTypeGuardFailed 

type ErrTypeGuardFailed struct {
	RequestedType ast.ValueType
	ActualType    ast.ValueType
}

ErrTypeGuardFailed is returned when a speicifc value type is requested thorugh NodeEvaluator (for example: "Float64Value") when the node doesn't support the given type, for example "Float64Value" is called on BoolNode

func (ErrTypeGuardFailed) Error 

func (e ErrTypeGuardFailed) Error() string

type ErrWrongFuncSignature added in v1.3.0 

type ErrWrongFuncSignature struct {
	Name           string
	DomainProvided Domain
	ArgLiterals    []string
	Func           Func
}

func (ErrWrongFuncSignature) Error added in v1.3.0 

func (e ErrWrongFuncSignature) Error() string

type EvalBinaryNode 

type EvalBinaryNode struct {
	// contains filtered or unexported fields
}

EvalBinaryNode is stateful expression which 

is evaluated using "expression trees" instead of stack based interpreter

func NewEvalBinaryNode 

func NewEvalBinaryNode(node *ast.BinaryNode) (*EvalBinaryNode, error)

func (*EvalBinaryNode) EvalBool 

func (e *EvalBinaryNode) EvalBool(scope *Scope, executionState ExecutionState) (bool, error)

EvalBool executes the expression based on eval bool

func (*EvalBinaryNode) EvalDuration added in v1.0.0 

func (e *EvalBinaryNode) EvalDuration(scope *Scope, executionState ExecutionState) (time.Duration, error)

func (*EvalBinaryNode) EvalFloat 

func (e *EvalBinaryNode) EvalFloat(scope *Scope, executionState ExecutionState) (float64, error)

EvalNum executes the expression based on eval numeric

func (*EvalBinaryNode) EvalInt 

func (e *EvalBinaryNode) EvalInt(scope *Scope, executionState ExecutionState) (int64, error)

func (*EvalBinaryNode) EvalMissing added in v1.3.0 

func (n *EvalBinaryNode) EvalMissing(scope *Scope, executionState ExecutionState) (*ast.Missing, error)

func (*EvalBinaryNode) EvalRegex 

func (n *EvalBinaryNode) EvalRegex(scope *Scope, executionState ExecutionState) (*regexp.Regexp, error)

func (*EvalBinaryNode) EvalString 

func (e *EvalBinaryNode) EvalString(scope *Scope, executionState ExecutionState) (string, error)

func (*EvalBinaryNode) EvalTime added in v1.0.0 

func (n *EvalBinaryNode) EvalTime(scope *Scope, executionState ExecutionState) (time.Time, error)

func (*EvalBinaryNode) IsDynamic added in v1.0.0 

func (n *EvalBinaryNode) IsDynamic() bool

func (*EvalBinaryNode) String added in v1.4.0 

func (n *EvalBinaryNode) String() string

func (*EvalBinaryNode) Type 

func (n *EvalBinaryNode) Type(scope ReadOnlyScope) (ast.ValueType, error)

type EvalBoolNode 

type EvalBoolNode struct {
	Node *ast.BoolNode
}

func (*EvalBoolNode) EvalBool 

func (n *EvalBoolNode) EvalBool(scope *Scope, executionState ExecutionState) (bool, error)

func (*EvalBoolNode) EvalDuration added in v1.0.0 

func (n *EvalBoolNode) EvalDuration(scope *Scope, executionState ExecutionState) (time.Duration, error)

func (*EvalBoolNode) EvalFloat 

func (n *EvalBoolNode) EvalFloat(scope *Scope, executionState ExecutionState) (float64, error)

func (*EvalBoolNode) EvalInt 

func (n *EvalBoolNode) EvalInt(scope *Scope, executionState ExecutionState) (int64, error)

func (*EvalBoolNode) EvalMissing added in v1.3.0 

func (n *EvalBoolNode) EvalMissing(scope *Scope, executionState ExecutionState) (*ast.Missing, error)

func (*EvalBoolNode) EvalRegex 

func (n *EvalBoolNode) EvalRegex(scope *Scope, executionState ExecutionState) (*regexp.Regexp, error)

func (*EvalBoolNode) EvalString 

func (n *EvalBoolNode) EvalString(scope *Scope, executionState ExecutionState) (string, error)

func (*EvalBoolNode) EvalTime added in v1.0.0 

func (n *EvalBoolNode) EvalTime(scope *Scope, executionState ExecutionState) (time.Time, error)

func (*EvalBoolNode) IsDynamic added in v1.0.0 

func (n *EvalBoolNode) IsDynamic() bool

func (*EvalBoolNode) String added in v1.4.0 

func (n *EvalBoolNode) String() string

func (*EvalBoolNode) Type 

func (n *EvalBoolNode) Type(scope ReadOnlyScope) (ast.ValueType, error)

type EvalDurationNode added in v1.0.0 

type EvalDurationNode struct {
	Duration time.Duration
}

func (*EvalDurationNode) EvalBool added in v1.0.0 

func (n *EvalDurationNode) EvalBool(scope *Scope, executionState ExecutionState) (bool, error)

func (*EvalDurationNode) EvalDuration added in v1.0.0 

func (n *EvalDurationNode) EvalDuration(scope *Scope, executionState ExecutionState) (time.Duration, error)

func (*EvalDurationNode) EvalFloat added in v1.0.0 

func (n *EvalDurationNode) EvalFloat(scope *Scope, executionState ExecutionState) (float64, error)

func (*EvalDurationNode) EvalInt added in v1.0.0 

func (n *EvalDurationNode) EvalInt(scope *Scope, executionState ExecutionState) (int64, error)

func (*EvalDurationNode) EvalMissing added in v1.3.0 

func (n *EvalDurationNode) EvalMissing(scope *Scope, executionState ExecutionState) (*ast.Missing, error)

func (*EvalDurationNode) EvalRegex added in v1.0.0 

func (n *EvalDurationNode) EvalRegex(scope *Scope, executionState ExecutionState) (*regexp.Regexp, error)

func (*EvalDurationNode) EvalString added in v1.0.0 

func (n *EvalDurationNode) EvalString(scope *Scope, executionState ExecutionState) (string, error)

func (*EvalDurationNode) EvalTime added in v1.0.0 

func (n *EvalDurationNode) EvalTime(scope *Scope, executionState ExecutionState) (time.Time, error)

func (*EvalDurationNode) IsDynamic added in v1.0.0 

func (n *EvalDurationNode) IsDynamic() bool

func (*EvalDurationNode) String added in v1.4.0 

func (n *EvalDurationNode) String() string

func (*EvalDurationNode) Type added in v1.0.0 

func (n *EvalDurationNode) Type(scope ReadOnlyScope) (ast.ValueType, error)

type EvalFloatNode 

type EvalFloatNode struct {
	Float64 float64
}

func (*EvalFloatNode) EvalBool 

func (n *EvalFloatNode) EvalBool(scope *Scope, executionState ExecutionState) (bool, error)

func (*EvalFloatNode) EvalDuration added in v1.0.0 

func (n *EvalFloatNode) EvalDuration(scope *Scope, executionState ExecutionState) (time.Duration, error)

func (*EvalFloatNode) EvalFloat 

func (n *EvalFloatNode) EvalFloat(scope *Scope, executionState ExecutionState) (float64, error)

func (*EvalFloatNode) EvalInt 

func (n *EvalFloatNode) EvalInt(scope *Scope, executionState ExecutionState) (int64, error)

func (*EvalFloatNode) EvalMissing added in v1.3.0 

func (n *EvalFloatNode) EvalMissing(scope *Scope, executionState ExecutionState) (*ast.Missing, error)

func (*EvalFloatNode) EvalRegex 

func (n *EvalFloatNode) EvalRegex(scope *Scope, executionState ExecutionState) (*regexp.Regexp, error)

func (*EvalFloatNode) EvalString 

func (n *EvalFloatNode) EvalString(scope *Scope, executionState ExecutionState) (string, error)

func (*EvalFloatNode) EvalTime added in v1.0.0 

func (n *EvalFloatNode) EvalTime(scope *Scope, executionState ExecutionState) (time.Time, error)

func (*EvalFloatNode) IsDynamic added in v1.0.0 

func (n *EvalFloatNode) IsDynamic() bool

func (*EvalFloatNode) String added in v1.4.0 

func (n *EvalFloatNode) String() string

func (*EvalFloatNode) Type 

func (n *EvalFloatNode) Type(scope ReadOnlyScope) (ast.ValueType, error)

type EvalFunctionNode 

type EvalFunctionNode struct {
	// contains filtered or unexported fields
}

func NewEvalFunctionNode 

func NewEvalFunctionNode(funcNode *ast.FunctionNode) (*EvalFunctionNode, error)

func (*EvalFunctionNode) EvalBool 

func (n *EvalFunctionNode) EvalBool(scope *Scope, executionState ExecutionState) (bool, error)

func (*EvalFunctionNode) EvalDuration added in v1.0.0 

func (n *EvalFunctionNode) EvalDuration(scope *Scope, executionState ExecutionState) (time.Duration, error)

func (*EvalFunctionNode) EvalFloat 

func (n *EvalFunctionNode) EvalFloat(scope *Scope, executionState ExecutionState) (float64, error)

func (*EvalFunctionNode) EvalInt 

func (n *EvalFunctionNode) EvalInt(scope *Scope, executionState ExecutionState) (int64, error)

func (*EvalFunctionNode) EvalMissing added in v1.3.0 

func (n *EvalFunctionNode) EvalMissing(scope *Scope, executionState ExecutionState) (*ast.Missing, error)

func (*EvalFunctionNode) EvalRegex 

func (n *EvalFunctionNode) EvalRegex(scope *Scope, executionState ExecutionState) (*regexp.Regexp, error)

func (*EvalFunctionNode) EvalString 

func (n *EvalFunctionNode) EvalString(scope *Scope, executionState ExecutionState) (string, error)

func (*EvalFunctionNode) EvalTime added in v1.0.0 

func (n *EvalFunctionNode) EvalTime(scope *Scope, executionState ExecutionState) (time.Time, error)

func (*EvalFunctionNode) IsDynamic added in v1.0.0 

func (n *EvalFunctionNode) IsDynamic() bool

func (*EvalFunctionNode) String added in v1.4.0 

func (n *EvalFunctionNode) String() string

func (*EvalFunctionNode) Type 

func (n *EvalFunctionNode) Type(scope ReadOnlyScope) (ast.ValueType, error)

type EvalIntNode 

type EvalIntNode struct {
	Int64 int64
}

func (*EvalIntNode) EvalBool 

func (n *EvalIntNode) EvalBool(scope *Scope, executionState ExecutionState) (bool, error)

func (*EvalIntNode) EvalDuration added in v1.0.0 

func (n *EvalIntNode) EvalDuration(scope *Scope, executionState ExecutionState) (time.Duration, error)

func (*EvalIntNode) EvalFloat 

func (n *EvalIntNode) EvalFloat(scope *Scope, executionState ExecutionState) (float64, error)

func (*EvalIntNode) EvalInt 

func (n *EvalIntNode) EvalInt(scope *Scope, executionState ExecutionState) (int64, error)

func (*EvalIntNode) EvalMissing added in v1.3.0 

func (n *EvalIntNode) EvalMissing(scope *Scope, executionState ExecutionState) (*ast.Missing, error)

func (*EvalIntNode) EvalRegex 

func (n *EvalIntNode) EvalRegex(scope *Scope, executionState ExecutionState) (*regexp.Regexp, error)

func (*EvalIntNode) EvalString 

func (n *EvalIntNode) EvalString(scope *Scope, executionState ExecutionState) (string, error)

func (*EvalIntNode) EvalTime added in v1.0.0 

func (n *EvalIntNode) EvalTime(scope *Scope, executionState ExecutionState) (time.Time, error)

func (*EvalIntNode) IsDynamic added in v1.0.0 

func (n *EvalIntNode) IsDynamic() bool

func (*EvalIntNode) String added in v1.4.0 

func (n *EvalIntNode) String() string

func (*EvalIntNode) Type 

func (n *EvalIntNode) Type(scope ReadOnlyScope) (ast.ValueType, error)

type EvalLambdaNode added in v1.0.0 

type EvalLambdaNode struct {
	// contains filtered or unexported fields
}

func NewEvalLambdaNode added in v1.0.0 

func NewEvalLambdaNode(lambda *ast.LambdaNode) (*EvalLambdaNode, error)

func (*EvalLambdaNode) EvalBool added in v1.0.0 

func (n *EvalLambdaNode) EvalBool(scope *Scope, _ ExecutionState) (bool, error)

func (*EvalLambdaNode) EvalDuration added in v1.0.0 

func (n *EvalLambdaNode) EvalDuration(scope *Scope, _ ExecutionState) (time.Duration, error)

func (*EvalLambdaNode) EvalFloat added in v1.0.0 

func (n *EvalLambdaNode) EvalFloat(scope *Scope, _ ExecutionState) (float64, error)

func (*EvalLambdaNode) EvalInt added in v1.0.0 

func (n *EvalLambdaNode) EvalInt(scope *Scope, _ ExecutionState) (int64, error)

func (*EvalLambdaNode) EvalMissing added in v1.3.0 

func (n *EvalLambdaNode) EvalMissing(scope *Scope, _ ExecutionState) (*ast.Missing, error)

func (*EvalLambdaNode) EvalRegex added in v1.0.0 

func (n *EvalLambdaNode) EvalRegex(scope *Scope, _ ExecutionState) (*regexp.Regexp, error)

func (*EvalLambdaNode) EvalString added in v1.0.0 

func (n *EvalLambdaNode) EvalString(scope *Scope, _ ExecutionState) (string, error)

func (*EvalLambdaNode) EvalTime added in v1.0.0 

func (n *EvalLambdaNode) EvalTime(scope *Scope, _ ExecutionState) (time.Time, error)

func (*EvalLambdaNode) IsDynamic added in v1.0.0 

func (n *EvalLambdaNode) IsDynamic() bool

func (*EvalLambdaNode) String added in v1.4.0 

func (n *EvalLambdaNode) String() string

func (*EvalLambdaNode) Type added in v1.0.0 

func (n *EvalLambdaNode) Type(scope ReadOnlyScope) (ast.ValueType, error)

type EvalReferenceNode 

type EvalReferenceNode struct {
	Node *ast.ReferenceNode
}

func (*EvalReferenceNode) EvalBool 

func (n *EvalReferenceNode) EvalBool(scope *Scope, executionState ExecutionState) (bool, error)

func (*EvalReferenceNode) EvalDuration added in v1.0.0 

func (n *EvalReferenceNode) EvalDuration(scope *Scope, executionState ExecutionState) (time.Duration, error)

func (*EvalReferenceNode) EvalFloat 

func (n *EvalReferenceNode) EvalFloat(scope *Scope, executionState ExecutionState) (float64, error)

func (*EvalReferenceNode) EvalInt 

func (n *EvalReferenceNode) EvalInt(scope *Scope, executionState ExecutionState) (int64, error)

func (*EvalReferenceNode) EvalMissing added in v1.3.0 

func (n *EvalReferenceNode) EvalMissing(scope *Scope, executionState ExecutionState) (*ast.Missing, error)

func (*EvalReferenceNode) EvalRegex 

func (n *EvalReferenceNode) EvalRegex(scope *Scope, executionState ExecutionState) (*regexp.Regexp, error)

func (*EvalReferenceNode) EvalString 

func (n *EvalReferenceNode) EvalString(scope *Scope, executionState ExecutionState) (string, error)

func (*EvalReferenceNode) EvalTime added in v1.0.0 

func (n *EvalReferenceNode) EvalTime(scope *Scope, executionState ExecutionState) (time.Time, error)

func (*EvalReferenceNode) IsDynamic added in v1.0.0 

func (n *EvalReferenceNode) IsDynamic() bool

func (*EvalReferenceNode) String added in v1.4.0 

func (n *EvalReferenceNode) String() string

func (*EvalReferenceNode) Type 

func (n *EvalReferenceNode) Type(scope ReadOnlyScope) (ast.ValueType, error)

type EvalRegexNode 

type EvalRegexNode struct {
	Node *ast.RegexNode
}

func (*EvalRegexNode) EvalBool 

func (n *EvalRegexNode) EvalBool(scope *Scope, executionState ExecutionState) (bool, error)

func (*EvalRegexNode) EvalDuration added in v1.0.0 

func (n *EvalRegexNode) EvalDuration(scope *Scope, executionState ExecutionState) (time.Duration, error)

func (*EvalRegexNode) EvalFloat 

func (n *EvalRegexNode) EvalFloat(scope *Scope, executionState ExecutionState) (float64, error)

func (*EvalRegexNode) EvalInt 

func (n *EvalRegexNode) EvalInt(scope *Scope, executionState ExecutionState) (int64, error)

func (*EvalRegexNode) EvalMissing added in v1.3.0 

func (n *EvalRegexNode) EvalMissing(scope *Scope, executionState ExecutionState) (*ast.Missing, error)

func (*EvalRegexNode) EvalRegex 

func (n *EvalRegexNode) EvalRegex(scope *Scope, executionState ExecutionState) (*regexp.Regexp, error)

func (*EvalRegexNode) EvalString 

func (n *EvalRegexNode) EvalString(scope *Scope, executionState ExecutionState) (string, error)

func (*EvalRegexNode) EvalTime added in v1.0.0 

func (n *EvalRegexNode) EvalTime(scope *Scope, executionState ExecutionState) (time.Time, error)

func (*EvalRegexNode) IsDynamic added in v1.0.0 

func (n *EvalRegexNode) IsDynamic() bool

func (*EvalRegexNode) String added in v1.4.0 

func (n *EvalRegexNode) String() string

func (*EvalRegexNode) Type 

func (n *EvalRegexNode) Type(scope ReadOnlyScope) (ast.ValueType, error)

type EvalStringNode 

type EvalStringNode struct {
	Node *ast.StringNode
}

func (*EvalStringNode) EvalBool 

func (n *EvalStringNode) EvalBool(scope *Scope, executionState ExecutionState) (bool, error)

func (*EvalStringNode) EvalDuration added in v1.0.0 

func (n *EvalStringNode) EvalDuration(scope *Scope, executionState ExecutionState) (time.Duration, error)

func (*EvalStringNode) EvalFloat 

func (n *EvalStringNode) EvalFloat(scope *Scope, executionState ExecutionState) (float64, error)

func (*EvalStringNode) EvalInt 

func (n *EvalStringNode) EvalInt(scope *Scope, executionState ExecutionState) (int64, error)

func (*EvalStringNode) EvalMissing added in v1.3.0 

func (n *EvalStringNode) EvalMissing(scope *Scope, executionState ExecutionState) (*ast.Missing, error)

func (*EvalStringNode) EvalRegex 

func (n *EvalStringNode) EvalRegex(scope *Scope, executionState ExecutionState) (*regexp.Regexp, error)

func (*EvalStringNode) EvalString 

func (n *EvalStringNode) EvalString(scope *Scope, executionState ExecutionState) (string, error)

func (*EvalStringNode) EvalTime added in v1.0.0 

func (n *EvalStringNode) EvalTime(scope *Scope, executionState ExecutionState) (time.Time, error)

func (*EvalStringNode) IsDynamic added in v1.0.0 

func (n *EvalStringNode) IsDynamic() bool

func (*EvalStringNode) String added in v1.4.0 

func (n *EvalStringNode) String() string

func (*EvalStringNode) Type 

func (n *EvalStringNode) Type(scope ReadOnlyScope) (ast.ValueType, error)

type EvalUnaryNode 

type EvalUnaryNode struct {
	// contains filtered or unexported fields
}

func NewEvalUnaryNode 

func NewEvalUnaryNode(unaryNode *ast.UnaryNode) (*EvalUnaryNode, error)

func (*EvalUnaryNode) EvalBool 

func (n *EvalUnaryNode) EvalBool(scope *Scope, executionState ExecutionState) (bool, error)

func (*EvalUnaryNode) EvalDuration added in v1.0.0 

func (n *EvalUnaryNode) EvalDuration(scope *Scope, executionState ExecutionState) (time.Duration, error)

func (*EvalUnaryNode) EvalFloat 

func (n *EvalUnaryNode) EvalFloat(scope *Scope, executionState ExecutionState) (float64, error)

func (*EvalUnaryNode) EvalInt 

func (n *EvalUnaryNode) EvalInt(scope *Scope, executionState ExecutionState) (int64, error)

func (*EvalUnaryNode) EvalMissing added in v1.3.0 

func (n *EvalUnaryNode) EvalMissing(scope *Scope, executionState ExecutionState) (*ast.Missing, error)

func (*EvalUnaryNode) EvalRegex 

func (n *EvalUnaryNode) EvalRegex(scope *Scope, executionState ExecutionState) (*regexp.Regexp, error)

func (*EvalUnaryNode) EvalString 

func (n *EvalUnaryNode) EvalString(scope *Scope, executionState ExecutionState) (string, error)

func (*EvalUnaryNode) EvalTime added in v1.0.0 

func (n *EvalUnaryNode) EvalTime(scope *Scope, executionState ExecutionState) (time.Time, error)

func (*EvalUnaryNode) IsDynamic added in v1.0.0 

func (n *EvalUnaryNode) IsDynamic() bool

func (*EvalUnaryNode) String added in v1.4.0 

func (n *EvalUnaryNode) String() string

func (*EvalUnaryNode) Type 

func (n *EvalUnaryNode) Type(scope ReadOnlyScope) (ast.ValueType, error)

type ExecutionState 

type ExecutionState struct {
	Funcs Funcs
}

ExecutionState is auxiliary struct for data/context that needs to be passed to evaluation functions

func CreateExecutionState 

func CreateExecutionState() ExecutionState

func (ExecutionState) ResetAll 

func (ea ExecutionState) ResetAll()

type Expression 

type Expression interface {
	Reset()

	Type(scope ReadOnlyScope) (ast.ValueType, error)

	EvalFloat(scope *Scope) (float64, error)
	EvalInt(scope *Scope) (int64, error)
	EvalString(scope *Scope) (string, error)
	EvalBool(scope *Scope) (bool, error)
	EvalDuration(scope *Scope) (time.Duration, error)

	Eval(scope *Scope) (interface{}, error)

	// Return a copy of the expression but with a Reset state.
	CopyReset() Expression
}

Expression is interface that describe expression with state and it's evaluation.

func NewExpression 

func NewExpression(node ast.Node) (Expression, error)

NewExpression accept a node and try to "compile"/ "specialise" it in order to achieve better runtime performance.

For example: 

Given a BinaryNode{ReferNode("value"), NumberNode{Float64:10}} during runtime
we can find the type of "value" and find the most matching comparison function - (float64,float64) or (int64,float64)

type Func added in v1.0.0 

type Func interface {
	Reset()
	Call(...interface{}) (interface{}, error)
	Signature() map[Domain]ast.ValueType
}

A callable function from within the expression

type Funcs added in v1.0.0 

type Funcs map[string]Func

Lookup for functions

func NewFunctions added in v1.0.0 

func NewFunctions() Funcs

Return set of built-in Funcs

type NodeEvaluator 

type NodeEvaluator interface {
	EvalFloat(scope *Scope, executionState ExecutionState) (float64, error)
	EvalInt(scope *Scope, executionState ExecutionState) (int64, error)
	EvalString(scope *Scope, executionState ExecutionState) (string, error)
	EvalBool(scope *Scope, executionState ExecutionState) (bool, error)
	EvalRegex(scope *Scope, executionState ExecutionState) (*regexp.Regexp, error)
	EvalTime(scope *Scope, executionState ExecutionState) (time.Time, error)
	EvalDuration(scope *Scope, executionState ExecutionState) (time.Duration, error)
	EvalMissing(scope *Scope, executionState ExecutionState) (*ast.Missing, error)

	// Type returns the type of ast.ValueType
	Type(scope ReadOnlyScope) (ast.ValueType, error)
	// Whether the type returned by the node can change.
	IsDynamic() bool
}

NodeEvaluator provides a generic way for trying to fetch node value, if a speicifc type is requested (so Value isn't called, the *Value is called) ErrTypeGuardFailed must be returned

type ReadOnlyScope 

type ReadOnlyScope interface {
	Get(name string) (interface{}, error)
	References() []string
	DynamicFunc(name string) *DynamicFunc
}

type Scope added in v1.0.0 

type Scope struct {
	// contains filtered or unexported fields
}

Contains a set of variables references and their values.

func NewScope added in v1.0.0 

func NewScope() *Scope

Initialize a new Scope object.

func (*Scope) DynamicFunc added in v1.3.0 

func (s *Scope) DynamicFunc(name string) *DynamicFunc

func (*Scope) DynamicMethod added in v1.0.0 

func (s *Scope) DynamicMethod(name string) DynamicMethod

func (*Scope) Get added in v1.0.0 

func (s *Scope) Get(name string) (interface{}, error)

Get returns the value of 'name'.

func (*Scope) Has added in v1.0.0 

func (s *Scope) Has(name string) bool

Whether a value has been set on the scope

func (*Scope) References added in v1.4.0 

func (s *Scope) References() []string

func (*Scope) Reset added in v1.0.0 

func (s *Scope) Reset()

Reset all scope values to an empty state.

func (*Scope) Set added in v1.0.0 

func (s *Scope) Set(name string, value interface{})

Set defines a name -> value pairing in the scope.

func (*Scope) SetDynamicFunc added in v1.3.0 

func (s *Scope) SetDynamicFunc(name string, f *DynamicFunc)

func (*Scope) SetDynamicMethod added in v1.0.0 

func (s *Scope) SetDynamicMethod(name string, m DynamicMethod)

type ScopePool 

type ScopePool interface {
	Get() *Scope
	Put(scope *Scope)

	ReferenceVariables() []string
}

ScopePool - pooling mechanism for Scope The idea behind scope pool is to pool scopes and to put them only the needed variables for execution.

func NewScopePool 

func NewScopePool(referenceVariables []string) ScopePool

NewScopePool - creates new ScopePool for the given Node

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