values

package
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 Go to latest Published: Jan 3, 2021 License: MIT Imports: 17 Imported by: 0

Documentation

Overview

Package values declares the flux data types and implements them.

Index

Constants

This section is empty.

Variables

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var (
	// InvalidValue is a non nil value who's type is semantic.Invalid
	InvalidValue = value{}

	// Null is an untyped nil value.
	Null = null{}
)

Functions

func AllLabels 

func AllLabels() labelSet

AllLabels returns a label set that represents the infinite set of all possible string labels.

func CheckKind 

func CheckKind(got, exp semantic.Nature)

CheckKind panics if got != exp.

func FormattedScope 

func FormattedScope(scope Scope) fmt.Formatter

FormattedScope produces a fmt.Formatter for pretty printing a scope.

func IsTimeable 

func IsTimeable(v Value) bool

IsTimeable checks if value v is Timeable.

func NewFunction 

func NewFunction(name string, typ semantic.MonoType, call func(ctx context.Context, args Object) (Value, error), sideEffect bool) *function

NewFunction returns a new function value. This function will panic if it is passed anything other than a function type.

func UnexpectedKind 

func UnexpectedKind(got, exp semantic.Nature) error

func Unwrap 

func Unwrap(v Value) interface{}

Unwrap will extract the primitive value from the Value interface.

Types

type Array 

type Array interface {
	Value
	Get(i int) Value
	Set(i int, v Value)
	Append(v Value)
	Len() int
	Range(func(i int, v Value))
	Sort(func(i, j Value) bool)
}

Array represents an sequence of elements All elements must be the same type

func NewArray 

func NewArray(arrType semantic.MonoType) Array

func NewArrayWithBacking 

func NewArrayWithBacking(arrType semantic.MonoType, elements []Value) Array

type BinaryFuncSignature 

type BinaryFuncSignature struct {
	Operator    ast.OperatorKind
	Left, Right semantic.Nature
}

type BinaryFunction 

type BinaryFunction func(l, r Value) (Value, error)

func LookupBinaryFunction 

func LookupBinaryFunction(sig BinaryFuncSignature) (BinaryFunction, error)

LookupBinaryFunction returns an appropriate binary function that evaluates two values and returns another value. If the two types are not compatible with the given operation, this returns an error.

type Dictionary 

type Dictionary interface {
	Value

	// Get will retrieve a Value out of the Dictionary.
	// If the key is not present, the def Value will
	// be returned instead.
	Get(key, def Value) Value

	// Insert will insert a Value into the Dictionary
	// using the key and value. It will return a new
	// Dictionary with the key/value inserted. If the
	// key was already in the Dictionary, it will
	// be replaced.
	//
	// Attempting to insert a null value for the key
	// will return an error.
	Insert(key, value Value) (Dictionary, error)

	// Remove will remove the key/value pair that
	// matches with the key. It will return a new
	// Dictionary with the key/value removed.
	Remove(key Value) Dictionary

	// Range will iterate over each element in
	// the Dictionary.
	Range(func(key, value Value))

	// Len returns the number of elements inside of
	// Dictionary.
	Len() int
}

Dictionary defines the interface for a dictionary.

A Dictionary is immutable. Changes to a Dictionary will return a new Dictionary.

func NewDict 

func NewDict(dictType semantic.MonoType) Dictionary

NewDict will construct a new Dictionary with the given key type.

func NewEmptyDict 

func NewEmptyDict(ty semantic.MonoType) Dictionary

NewEmptyDict will construct an empty dictionary

type DictionaryBuilder 

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

DictionaryBuilder can be used to construct a Dictionary with in-place memory instead of successive Insert calls that create new Dictionary values.

func NewDictBuilder 

func NewDictBuilder(dictType semantic.MonoType) DictionaryBuilder

NewDictBuilder will create a new DictionaryBuilder for the given key type.

func (*DictionaryBuilder) Dict 

func (d *DictionaryBuilder) Dict() Dictionary

Dict will construct a new Dictionary using the inserted values.

func (*DictionaryBuilder) Get 

func (d *DictionaryBuilder) Get(key Value) (Value, bool)

Get will retrieve a Value if it is present.

func (*DictionaryBuilder) Insert 

func (d *DictionaryBuilder) Insert(key, value Value) error

Insert will insert a new key/value pair into the Dictionary.

func (*DictionaryBuilder) Remove 

func (d *DictionaryBuilder) Remove(key Value)

Remove will remove a key/value pair from the Dictionary.

type Duration 

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

Duration is a vector representing the duration unit components.

func ConvertDurationMonths 

func ConvertDurationMonths(v time.Duration) Duration

ConvertDurationMonths takes a time.Duration and converts it into a Duration with months.

func ConvertDurationNsecs 

func ConvertDurationNsecs(v time.Duration) Duration

ConvertDurationNsecs takes a time.Duration and converts it into a Duration with nanoseconds.

func FromDurationValues 

func FromDurationValues(dur []ast.Duration) (d Duration, err error)

FromDurationValues creates a duration value from the duration values.

func MakeDuration 

func MakeDuration(nsecs int64, months int64, negative bool) Duration

MakeDuration takes nanoseconds and months as int64 and negative as a bool to construct a Duration with mixed units

func ParseDuration 

func ParseDuration(s string) (Duration, error)

func (Duration) AsValues 

func (d Duration) AsValues() []ast.Duration

AsValues will reconstruct the duration as a set of values. All of the components will be positive numbers.

func (Duration) Duration 

func (d Duration) Duration() time.Duration

Duration will return the nanosecond equivalent of this duration. It will assume that all months are the same length.

It is recommended not to use this method unless it is absolutely needed. This method will lose any precision that is present in the Duration and it should only be used for interfacing with outside code that is not month-aware.

func (Duration) Equal 

func (d Duration) Equal(other Duration) bool

Equal returns true if the two durations are equal.

func (Duration) IsNegative 

func (d Duration) IsNegative() bool

IsNegative returns true if this is a negative number. It returns false if the number is zero.

func (Duration) IsPositive 

func (d Duration) IsPositive() bool

IsPositive returns true if this is a positive number. It returns false if the number is zero.

func (Duration) IsZero 

func (d Duration) IsZero() bool

IsZero returns true if this is a zero duration.

func (Duration) MarshalText 

func (d Duration) MarshalText() ([]byte, error)

func (Duration) Months 

func (d Duration) Months() int64

func (Duration) MonthsOnly 

func (d Duration) MonthsOnly() bool

MonthsOnly returns true if this duration does not have a nanosecond component.

func (Duration) Mul 

func (d Duration) Mul(scale int) Duration

Mul will multiply the Duration by a scalar. This multiplies each component of the vector.

func (Duration) NanoOnly 

func (d Duration) NanoOnly() bool

NanoOnly returns true if this duration does not have a month component.

func (Duration) Nanoseconds 

func (d Duration) Nanoseconds() int64

func (Duration) Normalize 

func (d Duration) Normalize(interval Duration) Duration

Normalize will normalize the duration within the interval. It will ensure that the output duration is the smallest positive duration that is the equivalent of the current duration.

func (Duration) String 

func (d Duration) String() string

func (*Duration) UnmarshalText 

func (d *Duration) UnmarshalText(data []byte) error

type Function 

type Function interface {
	Value
	HasSideEffect() bool
	Call(ctx context.Context, args Object) (Value, error)
}

Function represents a callable type

type Object 

type Object interface {
	Value
	Get(name string) (Value, bool)

	// Set will set the object value for the given key.
	// The key must be part of the object property's type and the
	// value that is set must match that type. It is undefined
	// behavior to set a non-existant value or to set a value
	// with the wrong type.
	Set(name string, v Value)

	Len() int
	Range(func(name string, v Value))
}

func BuildObject 

func BuildObject(fn func(set ObjectSetter) error) (Object, error)

BuildObject will build an object by setting key/value pairs. The records in the object get constructed in the order they are set and resetting a key will overwrite a previous value, but will retain the existing position.

func BuildObjectWithSize 

func BuildObjectWithSize(sz int, fn func(set ObjectSetter) error) (Object, error)

BuildObjectWithSize will build an object with an initial size.

func NewObject 

func NewObject(typ semantic.MonoType) Object

NewObject will create a new object with the given type. The type must be of kind Row. The new object will be uninitialized and must be constructed with Set on each of the property keys before it is used.

func NewObjectWithValues 

func NewObjectWithValues(vals map[string]Value) Object

type ObjectSetter 

type ObjectSetter func(k string, v Value)

ObjectSetter will set the value for the key. If the key already exists, it will be overwritten with the new value.

type Option 

type Option struct {
	Value
}

Option is a value that has been declared as an option within the package. An option can be modified by another package from outside of the scope that the option was originally defined in, but it will affect the original scope it was defined in.

type Package 

type Package interface {
	Object

	// Name returns the package name.
	Name() string

	// Path returns the canonical import path for this package.
	Path() string
}

type Scope 

type Scope interface {
	// Lookup a name in the scope.
	Lookup(name string) (Value, bool)

	// LocalLookup a name in current scope only.
	LocalLookup(name string) (Value, bool)

	// Set binds a variable in the current scope.
	Set(name string, v Value)

	// Nest creates a new scope by nesting the current scope.
	// If the passed in object is not nil, its values will be added to the new nested scope.
	Nest(Object) Scope

	// Pop returns the parent of the current scope.
	Pop() Scope

	// Size is the number of visible names in scope.
	Size() int

	// Range iterates over all variable bindings in scope applying f.
	Range(f func(k string, v Value))

	// LocalRange iterates over all variable bindings only in the current scope.
	LocalRange(f func(k string, v Value))

	// SetReturn binds the return value of the scope.
	SetReturn(Value)

	// Return reports the bound return value of the scope.
	Return() Value

	// Copy creates a deep copy of the scope, values are not copied.
	// Copy preserves the nesting structure.
	Copy() Scope
}

func NewNestedScope 

func NewNestedScope(parent Scope, obj Object) Scope

NewNestedScope creates a new scope with bindings from obj and a parent.

func NewScope 

func NewScope() Scope

NewScope creates a new empty scope with no parent.

type Time 

type Time int64

func ConvertTime 

func ConvertTime(t time.Time) Time

func ParseTime 

func ParseTime(s string) (Time, error)

func (Time) Add 

func (t Time) Add(d Duration) Time

func (Time) Remainder 

func (t Time) Remainder(d Duration) (r Duration)

Remainder divides t by d and returns the remainder.

func (Time) Round 

func (t Time) Round(d Duration) Time

func (Time) String 

func (t Time) String() string

func (Time) Sub 

func (t Time) Sub(other Time) Duration

Sub takes another time and returns a duration giving the duration between the two times. A positive duration indicates that the receiver occurs after the other time.

func (Time) Time 

func (t Time) Time() time.Time

type Typer 

type Typer interface {
	Type() semantic.MonoType
}

type Value 

type Value interface {
	Typer
	IsNull() bool
	Str() string
	Bytes() []byte
	Int() int64
	UInt() uint64
	Float() float64
	Bool() bool
	Time() Time
	Duration() Duration
	Regexp() *regexp.Regexp
	Array() Array
	Object() Object
	Function() Function
	Dict() Dictionary
	Equal(Value) bool
}

func New 

func New(v interface{}) Value

New constructs a new Value by inferring the type from the interface. Note this method will panic if passed a nil value. If the interface does not translate to a valid Value type, then InvalidValue is returned.

func NewBool 

func NewBool(v bool) Value

func NewBytes 

func NewBytes(v []byte) Value

func NewDuration 

func NewDuration(v Duration) Value

func NewFloat 

func NewFloat(v float64) Value

func NewInt 

func NewInt(v int64) Value

func NewNull 

func NewNull(t semantic.MonoType) Value

func NewRegexp 

func NewRegexp(v *regexp.Regexp) Value

func NewString 

func NewString(v string) Value

func NewTime 

func NewTime(v Time) Value

func NewUInt 

func NewUInt(v uint64) Value

func SetOption 

func SetOption(p Package, name string, v Value) (Value, bool)

SetOption will set an option on the package and return the value representing the option.

type ValueStringer 

type ValueStringer interface {
	String() string
}

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