ast

package
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 Go to latest Published: Dec 11, 2018 License: MIT Imports: 6 Imported by: 49

Documentation

Overview

Package ast declares the types used to represent the syntax tree for Flux source code.

Index

Constants

This section is empty.

Variables

View Source 
var LogicalOperatorTokens = map[LogicalOperatorKind]string{
	AndOperator: "and",
	OrOperator:  "or",
}

LogicalOperatorTokens converts LogicalOperatorKind to string

View Source 
var OperatorTokens = map[OperatorKind]string{
	MultiplicationOperator:   "*",
	DivisionOperator:         "/",
	AdditionOperator:         "+",
	SubtractionOperator:      "-",
	LessThanEqualOperator:    "<=",
	LessThanOperator:         "<",
	GreaterThanOperator:      ">",
	GreaterThanEqualOperator: ">=",
	InOperator:               "in",
	NotOperator:              "not",
	NotEmptyOperator:         "not empty",
	EmptyOperator:            "empty",
	StartsWithOperator:       "startswith",
	EqualOperator:            "==",
	NotEqualOperator:         "!=",
	RegexpMatchOperator:      "=~",
	NotRegexpMatchOperator:   "!~",
}

OperatorTokens converts OperatorKind to string

Functions

func Format added in v0.8.0 

func Format(n Node) string

Returns a valid script for a given AST rooted at node `n`.

Formatting rules:

  • In a list of statements, if two statements are of a different type (e.g. an `OptionStatement` followed by an `ExpressionStatement`), they are separated by a double newline.
  • In a function call (or object definition), if the arguments (or properties) are more than 3, they are split into multiple lines.

func Walk added in v0.8.0 

func Walk(v Visitor, node Node)

`Walk` recursively visits every children of a given `Node` given a `Visitor`. It performs a pre-order visit of the AST (visit parent node, then visit children from left to right). If a call to `Visit` for a node returns a nil visitor, walk stops and doesn't visit the AST rooted at that node, otherwise it uses the returned visitor to continue walking. Once Walk has finished visiting a node (the node itself and its children), it invokes `Done` on the node's visitor. NOTE: `Walk` doesn't visit `nil` nodes.

Types

type ArrayExpression 

type ArrayExpression struct {
	BaseNode
	Elements []Expression `json:"elements"`
}

ArrayExpression is used to create and directly specify the elements of an array object

func (*ArrayExpression) Copy 

func (e *ArrayExpression) Copy() Node

func (*ArrayExpression) MarshalJSON 

func (e *ArrayExpression) MarshalJSON() ([]byte, error)

func (*ArrayExpression) Type 

func (*ArrayExpression) Type() string

Type is the abstract type

func (*ArrayExpression) UnmarshalJSON 

func (e *ArrayExpression) UnmarshalJSON(data []byte) error

type BaseNode 

type BaseNode struct {
	Loc *SourceLocation `json:"location,omitempty"`
}

BaseNode holds the attributes every expression or statement should have

func (BaseNode) Location 

func (b BaseNode) Location() SourceLocation

Location is the source location of the Node

type BinaryExpression 

type BinaryExpression struct {
	BaseNode
	Operator OperatorKind `json:"operator"`
	Left     Expression   `json:"left"`
	Right    Expression   `json:"right"`
}

BinaryExpression use binary operators act on two operands in an expression. BinaryExpression includes relational and arithmatic operators

func (*BinaryExpression) Copy 

func (e *BinaryExpression) Copy() Node

func (*BinaryExpression) MarshalJSON 

func (e *BinaryExpression) MarshalJSON() ([]byte, error)

func (*BinaryExpression) Type 

func (*BinaryExpression) Type() string

Type is the abstract type

func (*BinaryExpression) UnmarshalJSON 

func (e *BinaryExpression) UnmarshalJSON(data []byte) error

type Block added in v0.8.0 

type Block struct {
	BaseNode
	Body []Statement `json:"body"`
}

Block is a set of statements

func (*Block) Copy added in v0.8.0 

func (s *Block) Copy() Node

func (*Block) MarshalJSON added in v0.8.0 

func (s *Block) MarshalJSON() ([]byte, error)

func (*Block) Type added in v0.8.0 

func (*Block) Type() string

Type is the abstract type

func (*Block) UnmarshalJSON added in v0.8.0 

func (s *Block) UnmarshalJSON(data []byte) error

type BooleanLiteral 

type BooleanLiteral struct {
	BaseNode
	Value bool `json:"value"`
}

BooleanLiteral represent boolean values

func (*BooleanLiteral) Copy 

func (l *BooleanLiteral) Copy() Node

func (*BooleanLiteral) MarshalJSON 

func (l *BooleanLiteral) MarshalJSON() ([]byte, error)

func (*BooleanLiteral) Type 

func (*BooleanLiteral) Type() string

Type is the abstract type

type CallExpression 

type CallExpression struct {
	BaseNode
	Callee    Expression   `json:"callee"`
	Arguments []Expression `json:"arguments,omitempty"`
}

CallExpression represents a function all whose callee may be an Identifier or MemberExpression

func (*CallExpression) Copy 

func (e *CallExpression) Copy() Node

func (*CallExpression) MarshalJSON 

func (e *CallExpression) MarshalJSON() ([]byte, error)

func (*CallExpression) Type 

func (*CallExpression) Type() string

Type is the abstract type

func (*CallExpression) UnmarshalJSON 

func (e *CallExpression) UnmarshalJSON(data []byte) error

type ConditionalExpression 

type ConditionalExpression struct {
	BaseNode
	Test       Expression `json:"test"`
	Alternate  Expression `json:"alternate"`
	Consequent Expression `json:"consequent"`
}

ConditionalExpression selects one of two expressions, `Alternate` or `Consequent` depending on a third, boolean, expression, `Test`.

func (*ConditionalExpression) Copy 

func (e *ConditionalExpression) Copy() Node

func (*ConditionalExpression) MarshalJSON 

func (e *ConditionalExpression) MarshalJSON() ([]byte, error)

func (*ConditionalExpression) Type 

func (*ConditionalExpression) Type() string

Type is the abstract type

func (*ConditionalExpression) UnmarshalJSON 

func (e *ConditionalExpression) UnmarshalJSON(data []byte) error

type DateTimeLiteral 

type DateTimeLiteral struct {
	BaseNode
	Value time.Time `json:"value"`
}

DateTimeLiteral represents an instant in time with nanosecond precision using the syntax of golang's RFC3339 Nanosecond variant TODO: this may be better as a class initialization

func (*DateTimeLiteral) Copy 

func (l *DateTimeLiteral) Copy() Node

func (*DateTimeLiteral) MarshalJSON 

func (l *DateTimeLiteral) MarshalJSON() ([]byte, error)

func (*DateTimeLiteral) Type 

func (*DateTimeLiteral) Type() string

Type is the abstract type

type Duration 

type Duration struct {
	Magnitude int64  `json:"magnitude"`
	Unit      string `json:"unit"`
}

Duration is a pair consisting of length of time and the unit of time measured. It is the atomic unit from which all duration literals are composed.

type DurationLiteral 

type DurationLiteral struct {
	BaseNode
	Values []Duration `json:"values"`
}

DurationLiteral represents the elapsed time between two instants as an int64 nanosecond count with syntax of golang's time.Duration TODO: this may be better as a class initialization

func (*DurationLiteral) Copy 

func (l *DurationLiteral) Copy() Node

func (*DurationLiteral) MarshalJSON 

func (l *DurationLiteral) MarshalJSON() ([]byte, error)

func (*DurationLiteral) Type 

func (*DurationLiteral) Type() string

Type is the abstract type

type Expression 

type Expression interface {
	Node
	// contains filtered or unexported methods
}

Expression represents an action that can be performed by InfluxDB that can be evaluated to a value.

type ExpressionStatement 

type ExpressionStatement struct {
	BaseNode
	Expression Expression `json:"expression"`
}

ExpressionStatement may consist of an expression that does not return a value and is executed solely for its side-effects.

func (*ExpressionStatement) Copy 

func (s *ExpressionStatement) Copy() Node

func (*ExpressionStatement) MarshalJSON 

func (s *ExpressionStatement) MarshalJSON() ([]byte, error)

func (*ExpressionStatement) Type 

func (*ExpressionStatement) Type() string

Type is the abstract type

func (*ExpressionStatement) UnmarshalJSON 

func (s *ExpressionStatement) UnmarshalJSON(data []byte) error

type FloatLiteral 

type FloatLiteral struct {
	BaseNode
	Value float64 `json:"value"`
}

FloatLiteral represent floating point numbers according to the double representations defined by the IEEE-754-1985

func (*FloatLiteral) Copy 

func (l *FloatLiteral) Copy() Node

func (*FloatLiteral) MarshalJSON 

func (l *FloatLiteral) MarshalJSON() ([]byte, error)

func (*FloatLiteral) Type 

func (*FloatLiteral) Type() string

Type is the abstract type

type FunctionExpression added in v0.8.0 

type FunctionExpression struct {
	BaseNode
	Params []*Property `json:"params"`
	Body   Node        `json:"body"`
}

func (*FunctionExpression) Copy added in v0.8.0 

func (e *FunctionExpression) Copy() Node

func (*FunctionExpression) MarshalJSON added in v0.8.0 

func (e *FunctionExpression) MarshalJSON() ([]byte, error)

func (*FunctionExpression) Type added in v0.8.0 

func (*FunctionExpression) Type() string

Type is the abstract type

func (*FunctionExpression) UnmarshalJSON added in v0.8.0 

func (e *FunctionExpression) UnmarshalJSON(data []byte) error

type Identifier 

type Identifier struct {
	BaseNode
	Name string `json:"name"`
}

Identifier represents a name that identifies a unique Node

func (*Identifier) Copy 

func (i *Identifier) Copy() Node

func (*Identifier) MarshalJSON 

func (i *Identifier) MarshalJSON() ([]byte, error)

func (*Identifier) Type 

func (*Identifier) Type() string

Type is the abstract type

type ImportDeclaration added in v0.8.0 

type ImportDeclaration struct {
	BaseNode
	As   *Identifier    `json:"as"`
	Path *StringLiteral `json:"path"`
}

ImportDeclaration declares a single import

func (*ImportDeclaration) Copy added in v0.8.0 

func (d *ImportDeclaration) Copy() Node

func (*ImportDeclaration) MarshalJSON added in v0.8.0 

func (d *ImportDeclaration) MarshalJSON() ([]byte, error)

func (*ImportDeclaration) Type added in v0.8.0 

func (*ImportDeclaration) Type() string

Type is the abstract type

type IndexExpression added in v0.7.1 

type IndexExpression struct {
	BaseNode
	Array Expression `json:"array"`
	Index Expression `json:"index"`
}

IndexExpression represents indexing into an array

func (*IndexExpression) Copy added in v0.7.1 

func (e *IndexExpression) Copy() Node

func (*IndexExpression) MarshalJSON added in v0.7.1 

func (e *IndexExpression) MarshalJSON() ([]byte, error)

func (*IndexExpression) Type added in v0.7.1 

func (*IndexExpression) Type() string

func (*IndexExpression) UnmarshalJSON added in v0.7.1 

func (e *IndexExpression) UnmarshalJSON(data []byte) error

type IntegerLiteral 

type IntegerLiteral struct {
	BaseNode
	Value int64 `json:"value"`
}

IntegerLiteral represent integer numbers.

func (*IntegerLiteral) Copy 

func (l *IntegerLiteral) Copy() Node

func (*IntegerLiteral) MarshalJSON 

func (l *IntegerLiteral) MarshalJSON() ([]byte, error)

func (*IntegerLiteral) Type 

func (*IntegerLiteral) Type() string

Type is the abstract type

func (*IntegerLiteral) UnmarshalJSON 

func (l *IntegerLiteral) UnmarshalJSON(data []byte) error

type Literal 

type Literal interface {
	Expression
	// contains filtered or unexported methods
}

Literal is the lexical form for a literal expression which defines boolean, string, integer, number, duration, datetime or field values. Literals must be coerced explicitly.

type LogicalExpression 

type LogicalExpression struct {
	BaseNode
	Operator LogicalOperatorKind `json:"operator"`
	Left     Expression          `json:"left"`
	Right    Expression          `json:"right"`
}

LogicalExpression represent the rule conditions that collectively evaluate to either true or false. `or` expressions compute the disjunction of two boolean expressions and return boolean values. `and“ expressions compute the conjunction of two boolean expressions and return boolean values.

func (*LogicalExpression) Copy 

func (e *LogicalExpression) Copy() Node

func (*LogicalExpression) MarshalJSON 

func (e *LogicalExpression) MarshalJSON() ([]byte, error)

func (*LogicalExpression) Type 

func (*LogicalExpression) Type() string

Type is the abstract type

func (*LogicalExpression) UnmarshalJSON 

func (e *LogicalExpression) UnmarshalJSON(data []byte) error

type LogicalOperatorKind 

type LogicalOperatorKind int

LogicalOperatorKind are used with boolean (logical) values 

const (
	AndOperator LogicalOperatorKind
	OrOperator
)

func LogicalOperatorLookup 

func LogicalOperatorLookup(op string) LogicalOperatorKind

LogicalOperatorLookup converts the operators to LogicalOperatorKind

func (LogicalOperatorKind) MarshalText 

func (o LogicalOperatorKind) MarshalText() ([]byte, error)

func (LogicalOperatorKind) String 

func (o LogicalOperatorKind) String() string

func (*LogicalOperatorKind) UnmarshalText 

func (o *LogicalOperatorKind) UnmarshalText(data []byte) error

type MemberExpression 

type MemberExpression struct {
	BaseNode
	Object   Expression `json:"object"`
	Property Expression `json:"property"`
}

MemberExpression represents calling a property of a CallExpression

func (*MemberExpression) Copy 

func (e *MemberExpression) Copy() Node

func (*MemberExpression) MarshalJSON 

func (e *MemberExpression) MarshalJSON() ([]byte, error)

func (*MemberExpression) Type 

func (*MemberExpression) Type() string

Type is the abstract type

func (*MemberExpression) UnmarshalJSON 

func (e *MemberExpression) UnmarshalJSON(data []byte) error

type Node 

type Node interface {
	Type() string // Type property is a string that contains the variant type of the node
	Location() SourceLocation
	Copy() Node

	// All node must support json marshalling
	json.Marshaler
	// contains filtered or unexported methods
}

Node represents a node in the InfluxDB abstract syntax tree.

func UnmarshalNode 

func UnmarshalNode(data []byte) (Node, error)

type ObjectExpression 

type ObjectExpression struct {
	BaseNode
	Properties []*Property `json:"properties"`
}

ObjectExpression allows the declaration of an anonymous object within a declaration.

func (*ObjectExpression) Copy 

func (e *ObjectExpression) Copy() Node

func (*ObjectExpression) MarshalJSON 

func (e *ObjectExpression) MarshalJSON() ([]byte, error)

func (*ObjectExpression) Type 

func (*ObjectExpression) Type() string

Type is the abstract type

type OperatorKind 

type OperatorKind int

OperatorKind are Equality and Arithmatic operators. Result of evaluating an equality operator is always of type Boolean based on whether the comparison is true Arithmetic operators take numerical values (either literals or variables) as their operands 

and return a single numerical value.

const (
	MultiplicationOperator OperatorKind
	DivisionOperator
	AdditionOperator
	SubtractionOperator
	LessThanEqualOperator
	LessThanOperator
	GreaterThanEqualOperator
	GreaterThanOperator
	StartsWithOperator
	InOperator
	NotOperator
	NotEmptyOperator
	EmptyOperator
	EqualOperator
	NotEqualOperator
	RegexpMatchOperator
	NotRegexpMatchOperator
)

func OperatorLookup 

func OperatorLookup(op string) OperatorKind

OperatorLookup converts the operators to OperatorKind

func (OperatorKind) MarshalText 

func (o OperatorKind) MarshalText() ([]byte, error)

func (OperatorKind) String 

func (o OperatorKind) String() string

func (*OperatorKind) UnmarshalText 

func (o *OperatorKind) UnmarshalText(data []byte) error

type OptionStatement 

type OptionStatement struct {
	BaseNode
	Assignment *VariableAssignment `json:"assignment"`
}

OptionStatement syntactically is a single variable declaration

func (*OptionStatement) Copy 

func (s *OptionStatement) Copy() Node

Copy returns a deep copy of an OptionStatement Node

func (*OptionStatement) MarshalJSON 

func (s *OptionStatement) MarshalJSON() ([]byte, error)

func (*OptionStatement) Type 

func (*OptionStatement) Type() string

Type is the abstract type

type PackageClause added in v0.8.0 

type PackageClause struct {
	BaseNode
	Name *Identifier `json:"name"`
}

PackageClause defines the current package identifier.

func (*PackageClause) Copy added in v0.8.0 

func (c *PackageClause) Copy() Node

func (*PackageClause) MarshalJSON added in v0.8.0 

func (p *PackageClause) MarshalJSON() ([]byte, error)

func (*PackageClause) Type added in v0.8.0 

func (*PackageClause) Type() string

Type is the abstract type

type PipeExpression 

type PipeExpression struct {
	BaseNode
	Argument Expression      `json:"argument"`
	Call     *CallExpression `json:"call"`
}

func (*PipeExpression) Copy 

func (e *PipeExpression) Copy() Node

func (*PipeExpression) MarshalJSON 

func (e *PipeExpression) MarshalJSON() ([]byte, error)

func (*PipeExpression) Type 

func (*PipeExpression) Type() string

Type is the abstract type

func (*PipeExpression) UnmarshalJSON 

func (e *PipeExpression) UnmarshalJSON(data []byte) error

type PipeLiteral 

type PipeLiteral struct {
	BaseNode
}

PipeLiteral represents an specialized literal value, indicating the left hand value of a pipe expression.

func (*PipeLiteral) Copy 

func (i *PipeLiteral) Copy() Node

func (*PipeLiteral) MarshalJSON 

func (l *PipeLiteral) MarshalJSON() ([]byte, error)

func (*PipeLiteral) Type 

func (*PipeLiteral) Type() string

Type is the abstract type

type Position 

type Position struct {
	Line   int `json:"line"`   // Line is the line in the source marked by this position
	Column int `json:"column"` // Column is the column in the source marked by this position
}

Position represents a specific location in the source

func (Position) Less 

func (p Position) Less(o Position) bool

func (Position) String 

func (p Position) String() string

type Program 

type Program struct {
	BaseNode
	Package *PackageClause       `json:"package"`
	Imports []*ImportDeclaration `json:"imports"`
	Body    []Statement          `json:"body"`
}

Program represents a complete program source tree

func (*Program) Copy 

func (p *Program) Copy() Node

func (*Program) MarshalJSON 

func (p *Program) MarshalJSON() ([]byte, error)

func (*Program) Type 

func (*Program) Type() string

Type is the abstract type

func (*Program) UnmarshalJSON 

func (p *Program) UnmarshalJSON(data []byte) error

type Property 

type Property struct {
	BaseNode
	Key   *Identifier `json:"key"`
	Value Expression  `json:"value"`
}

Property is the value associated with a key

func (*Property) Copy 

func (p *Property) Copy() Node

func (*Property) MarshalJSON 

func (p *Property) MarshalJSON() ([]byte, error)

func (*Property) Type 

func (*Property) Type() string

Type is the abstract type

func (*Property) UnmarshalJSON 

func (p *Property) UnmarshalJSON(data []byte) error

type RegexpLiteral 

type RegexpLiteral struct {
	BaseNode
	Value *regexp.Regexp `json:"value"`
}

RegexpLiteral expressions begin and end with `/` and are regular expressions with syntax accepted by RE2

func (*RegexpLiteral) Copy 

func (l *RegexpLiteral) Copy() Node

func (*RegexpLiteral) MarshalJSON 

func (l *RegexpLiteral) MarshalJSON() ([]byte, error)

func (*RegexpLiteral) Type 

func (*RegexpLiteral) Type() string

Type is the abstract type

func (*RegexpLiteral) UnmarshalJSON 

func (l *RegexpLiteral) UnmarshalJSON(data []byte) error

type ReturnStatement 

type ReturnStatement struct {
	BaseNode
	Argument Expression `json:"argument"`
}

ReturnStatement defines an Expression to return

func (*ReturnStatement) Copy 

func (s *ReturnStatement) Copy() Node

func (*ReturnStatement) MarshalJSON 

func (s *ReturnStatement) MarshalJSON() ([]byte, error)

func (*ReturnStatement) Type 

func (*ReturnStatement) Type() string

Type is the abstract type

func (*ReturnStatement) UnmarshalJSON 

func (s *ReturnStatement) UnmarshalJSON(data []byte) error

type SourceLocation 

type SourceLocation struct {
	Start  Position `json:"start"`            // Start is the location in the source the node starts
	End    Position `json:"end"`              // End is the location in the source the node ends
	Source string   `json:"source,omitempty"` // Source is optional raw source
}

SourceLocation represents the location of a node in the AST

func (SourceLocation) Less 

func (l SourceLocation) Less(o SourceLocation) bool

func (SourceLocation) String 

func (l SourceLocation) String() string

type Statement 

type Statement interface {
	Node
	// contains filtered or unexported methods
}

Statement Perhaps we don't even want statements nor expression statements

type StringLiteral 

type StringLiteral struct {
	BaseNode
	Value string `json:"value"`
}

StringLiteral expressions begin and end with double quote marks.

func (*StringLiteral) Copy 

func (l *StringLiteral) Copy() Node

func (*StringLiteral) MarshalJSON 

func (l *StringLiteral) MarshalJSON() ([]byte, error)

func (*StringLiteral) Type 

func (*StringLiteral) Type() string

type UnaryExpression 

type UnaryExpression struct {
	BaseNode
	Operator OperatorKind `json:"operator"`
	Argument Expression   `json:"argument"`
}

UnaryExpression use operators act on a single operand in an expression.

func (*UnaryExpression) Copy 

func (e *UnaryExpression) Copy() Node

func (*UnaryExpression) MarshalJSON 

func (e *UnaryExpression) MarshalJSON() ([]byte, error)

func (*UnaryExpression) Type 

func (*UnaryExpression) Type() string

Type is the abstract type

func (*UnaryExpression) UnmarshalJSON 

func (e *UnaryExpression) UnmarshalJSON(data []byte) error

type UnsignedIntegerLiteral 

type UnsignedIntegerLiteral struct {
	BaseNode
	Value uint64 `json:"value"`
}

UnsignedIntegerLiteral represent integer numbers.

func (*UnsignedIntegerLiteral) Copy 

func (l *UnsignedIntegerLiteral) Copy() Node

func (*UnsignedIntegerLiteral) MarshalJSON 

func (l *UnsignedIntegerLiteral) MarshalJSON() ([]byte, error)

func (*UnsignedIntegerLiteral) Type 

func (*UnsignedIntegerLiteral) Type() string

Type is the abstract type

func (*UnsignedIntegerLiteral) UnmarshalJSON 

func (l *UnsignedIntegerLiteral) UnmarshalJSON(data []byte) error

type VariableAssignment added in v0.8.0 

type VariableAssignment struct {
	BaseNode
	ID   *Identifier `json:"id"`
	Init Expression  `json:"init"`
}

VariableAssignment represents the declaration of a variable

func (*VariableAssignment) Copy added in v0.8.0 

func (d *VariableAssignment) Copy() Node

func (*VariableAssignment) MarshalJSON added in v0.8.0 

func (d *VariableAssignment) MarshalJSON() ([]byte, error)

func (*VariableAssignment) Type added in v0.8.0 

func (*VariableAssignment) Type() string

Type is the abstract type

func (*VariableAssignment) UnmarshalJSON added in v0.8.0 

func (d *VariableAssignment) UnmarshalJSON(data []byte) error

type Visitor added in v0.8.0 

type Visitor interface {
	Visit(node Node) Visitor
	Done(node Node)
}

A `Visitor` extracts information from a `Node` to build a result and/or have side-effects on it. The result of `Visit` is a `Visitor` that, in turn, is used by `Walk` to visit the children of the node under exam. To stop walking, `Visit` must return `nil`.

func CreateVisitor added in v0.8.0 

func CreateVisitor(f func(Node)) Visitor

Source Files

View all Source files

Directories

Path Synopsis
Package asttest implements utilities for testing the abstract syntax tree.
 Package asttest implements utilities for testing the abstract syntax tree.
cmpgen
cmpgen generates comparison options for the asttest package.
 cmpgen generates comparison options for the asttest package.

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