stateful

package
v0.13.1 Latest Latest
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 Go to latest Published: May 13, 2016 License: MIT Imports: 6 Imported by: 0

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Index

Constants

View Source 
const TNumeric = TFloat64 & TInt64

Variables

This section is empty.

Functions

func FindReferenceVariables 

func FindReferenceVariables(nodes ...tick.Node) []string

Types

type ErrSide 

type ErrSide struct {
	IsLeftSide  bool
	IsRightSide 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 ValueType
	ActualType    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 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 *tick.BinaryNode) (*EvalBinaryNode, error)

func (*EvalBinaryNode) EvalBool 

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

EvalBool executes the expression based on eval bool

func (*EvalBinaryNode) EvalFloat 

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

EvalNum executes the expression based on eval numeric

func (*EvalBinaryNode) EvalInt 

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

func (*EvalBinaryNode) EvalRegex 

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

func (*EvalBinaryNode) EvalString 

func (n *EvalBinaryNode) EvalString(scope *tick.Scope, executionState ExecutionState) (string, error)

func (*EvalBinaryNode) Type 

func (n *EvalBinaryNode) Type(scope ReadOnlyScope, executionState ExecutionState) (ValueType, error)

type EvalBoolNode 

type EvalBoolNode struct {
	Node *tick.BoolNode
}

func (*EvalBoolNode) EvalBool 

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

func (*EvalBoolNode) EvalFloat 

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

func (*EvalBoolNode) EvalInt 

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

func (*EvalBoolNode) EvalRegex 

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

func (*EvalBoolNode) EvalString 

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

func (*EvalBoolNode) Type 

func (n *EvalBoolNode) Type(scope ReadOnlyScope, executionState ExecutionState) (ValueType, error)

type EvalFloatNode 

type EvalFloatNode struct {
	Float64 float64
}

func (*EvalFloatNode) EvalBool 

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

func (*EvalFloatNode) EvalFloat 

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

func (*EvalFloatNode) EvalInt 

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

func (*EvalFloatNode) EvalRegex 

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

func (*EvalFloatNode) EvalString 

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

func (*EvalFloatNode) Type 

func (n *EvalFloatNode) Type(scope ReadOnlyScope, executionState ExecutionState) (ValueType, error)

type EvalFunctionNode 

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

func NewEvalFunctionNode 

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

func (*EvalFunctionNode) EvalBool 

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

func (*EvalFunctionNode) EvalFloat 

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

func (*EvalFunctionNode) EvalInt 

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

func (*EvalFunctionNode) EvalRegex 

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

func (*EvalFunctionNode) EvalString 

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

func (*EvalFunctionNode) Type 

func (n *EvalFunctionNode) Type(scope ReadOnlyScope, executionState ExecutionState) (ValueType, error)

type EvalIntNode 

type EvalIntNode struct {
	Int64 int64
}

func (*EvalIntNode) EvalBool 

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

func (*EvalIntNode) EvalFloat 

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

func (*EvalIntNode) EvalInt 

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

func (*EvalIntNode) EvalRegex 

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

func (*EvalIntNode) EvalString 

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

func (*EvalIntNode) Type 

func (n *EvalIntNode) Type(scope ReadOnlyScope, executionState ExecutionState) (ValueType, error)

type EvalReferenceNode 

type EvalReferenceNode struct {
	Node *tick.ReferenceNode
}

func (*EvalReferenceNode) EvalBool 

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

func (*EvalReferenceNode) EvalFloat 

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

func (*EvalReferenceNode) EvalInt 

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

func (*EvalReferenceNode) EvalRegex 

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

func (*EvalReferenceNode) EvalString 

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

func (*EvalReferenceNode) Type 

func (n *EvalReferenceNode) Type(scope ReadOnlyScope, executionState ExecutionState) (ValueType, error)

type EvalRegexNode 

type EvalRegexNode struct {
	Node *tick.RegexNode
}

func (*EvalRegexNode) EvalBool 

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

func (*EvalRegexNode) EvalFloat 

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

func (*EvalRegexNode) EvalInt 

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

func (*EvalRegexNode) EvalRegex 

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

func (*EvalRegexNode) EvalString 

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

func (*EvalRegexNode) Type 

func (n *EvalRegexNode) Type(scope ReadOnlyScope, executionState ExecutionState) (ValueType, error)

type EvalStringNode 

type EvalStringNode struct {
	Node *tick.StringNode
}

func (*EvalStringNode) EvalBool 

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

func (*EvalStringNode) EvalFloat 

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

func (*EvalStringNode) EvalInt 

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

func (*EvalStringNode) EvalRegex 

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

func (*EvalStringNode) EvalString 

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

func (*EvalStringNode) Type 

func (n *EvalStringNode) Type(scope ReadOnlyScope, executionState ExecutionState) (ValueType, error)

type EvalUnaryNode 

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

func NewEvalUnaryNode 

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

func (*EvalUnaryNode) EvalBool 

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

func (*EvalUnaryNode) EvalFloat 

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

func (*EvalUnaryNode) EvalInt 

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

func (*EvalUnaryNode) EvalRegex 

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

func (*EvalUnaryNode) EvalString 

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

func (*EvalUnaryNode) Type 

func (n *EvalUnaryNode) Type(scope ReadOnlyScope, executionState ExecutionState) (ValueType, error)

type ExecutionState 

type ExecutionState struct {
	Funcs tick.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()

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

	EvalNum(scope *tick.Scope) (interface{}, error)
}

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

func NewExpression 

func NewExpression(node tick.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 NodeEvaluator 

type NodeEvaluator interface {
	EvalFloat(scope *tick.Scope, executionState ExecutionState) (float64, error)
	EvalInt(scope *tick.Scope, executionState ExecutionState) (int64, error)
	EvalString(scope *tick.Scope, executionState ExecutionState) (string, error)
	EvalBool(scope *tick.Scope, executionState ExecutionState) (bool, error)
	EvalRegex(scope *tick.Scope, executionState ExecutionState) (*regexp.Regexp, error)

	// Type returns the type of ValueType
	Type(scope ReadOnlyScope, executionState ExecutionState) (ValueType, error)
}

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)
}

type ScopePool 

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

	ReferenceVariables() []string
}

ScopePool - pooling mechanism for tick.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

type ValueType 

type ValueType uint8
const (
	InvalidType ValueType = iota << 1
	TFloat64
	TInt64
	TString
	TBool
	TRegex
)

func (ValueType) IsNumeric 

func (v ValueType) IsNumeric() bool

func (ValueType) String 

func (v ValueType) String() string

Source Files

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