ast

package
v1.3.0-rc3 Latest Latest
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 Go to latest Published: May 18, 2017 License: MIT Imports: 11 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	KW_And    = "AND"
	KW_Or     = "OR"
	KW_True   = "TRUE"
	KW_False  = "FALSE"
	KW_Var    = "var"
	KW_Lambda = "lambda"
)

Variables

View Source 
var MissingValue = &Missing{}

Functions

func FindFunctionCalls added in v1.3.0 

func FindFunctionCalls(nodes ...Node) []string

FindFunctionCalls walks all nodes and returns a list of name of function calls.

func FindReferenceVariables added in v1.3.0 

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

FindReferenceVariables walks all nodes and returns a list of name from reference variables.

func Format added in v1.3.0 

func Format(n Node) string

func IsCompOperator 

func IsCompOperator(typ TokenType) bool

True if token type is an operator used in comparisons.

func IsExprOperator 

func IsExprOperator(typ TokenType) bool

True if token type is an operator used in mathematical or boolean expressions.

func IsLogicalOperator 

func IsLogicalOperator(typ TokenType) bool

func IsMathOperator 

func IsMathOperator(typ TokenType) bool

True if token type is an operator used in mathematical expressions.

func ZeroValue 

func ZeroValue(t ValueType) interface{}

Types

type BinaryNode 

type BinaryNode struct {
	Left      Node
	Right     Node
	Operator  TokenType
	Comment   *CommentNode
	Parens    bool
	MultiLine bool
	// contains filtered or unexported fields
}

binaryNode holds two arguments and an operator.

func (BinaryNode) Char 

func (p BinaryNode) Char() int

func (*BinaryNode) Equal 

func (n *BinaryNode) Equal(o interface{}) bool

func (*BinaryNode) Format 

func (n *BinaryNode) Format(buf *bytes.Buffer, indent string, onNewLine bool)

func (BinaryNode) Line 

func (p BinaryNode) Line() int

func (BinaryNode) Position 

func (p BinaryNode) Position() int

func (*BinaryNode) SetComment 

func (n *BinaryNode) SetComment(c *CommentNode)

func (*BinaryNode) String 

func (n *BinaryNode) String() string

type BoolNode 

type BoolNode struct {
	Bool    bool
	Comment *CommentNode
	// contains filtered or unexported fields
}

boolNode holds one argument and an operator.

func (BoolNode) Char 

func (p BoolNode) Char() int

func (*BoolNode) Equal 

func (n *BoolNode) Equal(o interface{}) bool

func (*BoolNode) Format 

func (n *BoolNode) Format(buf *bytes.Buffer, indent string, onNewLine bool)

func (BoolNode) Line 

func (p BoolNode) Line() int

func (BoolNode) Position 

func (p BoolNode) Position() int

func (*BoolNode) SetComment 

func (n *BoolNode) SetComment(c *CommentNode)

func (*BoolNode) String 

func (n *BoolNode) String() string

type ChainNode 

type ChainNode struct {
	Left     Node
	Right    Node
	Operator TokenType
	Comment  *CommentNode
	// contains filtered or unexported fields
}

func (ChainNode) Char 

func (p ChainNode) Char() int

func (*ChainNode) Equal 

func (n *ChainNode) Equal(o interface{}) bool

func (*ChainNode) Format 

func (n *ChainNode) Format(buf *bytes.Buffer, indent string, onNewLine bool)

func (ChainNode) Line 

func (p ChainNode) Line() int

func (ChainNode) Position 

func (p ChainNode) Position() int

func (*ChainNode) SetComment 

func (n *ChainNode) SetComment(c *CommentNode)

func (*ChainNode) String 

func (n *ChainNode) String() string

type CommentNode 

type CommentNode struct {
	Comments []string
	// contains filtered or unexported fields
}

Hold the contents of a comment

func (CommentNode) Char 

func (p CommentNode) Char() int

func (*CommentNode) CommentString 

func (n *CommentNode) CommentString() string

func (*CommentNode) Equal 

func (n *CommentNode) Equal(o interface{}) bool

func (*CommentNode) Format 

func (n *CommentNode) Format(buf *bytes.Buffer, indent string, onNewLine bool)

func (CommentNode) Line 

func (p CommentNode) Line() int

func (CommentNode) Position 

func (p CommentNode) Position() int

func (*CommentNode) String 

func (n *CommentNode) String() string

type DeclarationNode 

type DeclarationNode struct {
	Left    *IdentifierNode
	Right   Node
	Comment *CommentNode
	// contains filtered or unexported fields
}

func (DeclarationNode) Char 

func (p DeclarationNode) Char() int

func (*DeclarationNode) Equal 

func (n *DeclarationNode) Equal(o interface{}) bool

func (*DeclarationNode) Format 

func (n *DeclarationNode) Format(buf *bytes.Buffer, indent string, onNewLine bool)

func (DeclarationNode) Line 

func (p DeclarationNode) Line() int

func (DeclarationNode) Position 

func (p DeclarationNode) Position() int

func (*DeclarationNode) SetComment 

func (n *DeclarationNode) SetComment(c *CommentNode)

func (*DeclarationNode) String 

func (n *DeclarationNode) String() string

type DurationNode 

type DurationNode struct {
	Dur     time.Duration //the duration
	Literal string
	Comment *CommentNode
	// contains filtered or unexported fields
}

durationNode holds a number: signed or unsigned integer or float. The value is parsed and stored under all the types that can represent the value. This simulates in a small amount of code the behavior of Go's ideal constants.

func (DurationNode) Char 

func (p DurationNode) Char() int

func (*DurationNode) Equal 

func (n *DurationNode) Equal(o interface{}) bool

func (*DurationNode) Format 

func (n *DurationNode) Format(buf *bytes.Buffer, indent string, onNewLine bool)

func (DurationNode) Line 

func (p DurationNode) Line() int

func (DurationNode) Position 

func (p DurationNode) Position() int

func (*DurationNode) SetComment 

func (n *DurationNode) SetComment(c *CommentNode)

func (*DurationNode) String 

func (n *DurationNode) String() string

type FuncType 

type FuncType int
const (
	GlobalFunc FuncType = iota
	ChainFunc
	PropertyFunc
	DynamicFunc
)

func (FuncType) String 

func (ft FuncType) String() string

type FunctionNode 

type FunctionNode struct {
	Type      FuncType
	Func      string // The identifier
	Args      []Node
	Comment   *CommentNode
	MultiLine bool
	// contains filtered or unexported fields
}

Holds the a function call with its args

func (FunctionNode) Char 

func (p FunctionNode) Char() int

func (*FunctionNode) Equal 

func (n *FunctionNode) Equal(o interface{}) bool

func (*FunctionNode) Format 

func (n *FunctionNode) Format(buf *bytes.Buffer, indent string, onNewLine bool)

func (FunctionNode) Line 

func (p FunctionNode) Line() int

func (FunctionNode) Position 

func (p FunctionNode) Position() int

func (*FunctionNode) SetComment 

func (n *FunctionNode) SetComment(c *CommentNode)

func (*FunctionNode) String 

func (n *FunctionNode) String() string

type IdentifierNode 

type IdentifierNode struct {
	Ident   string // The identifier
	Comment *CommentNode
	// contains filtered or unexported fields
}

Holds the textual representation of an identifier

func (IdentifierNode) Char 

func (p IdentifierNode) Char() int

func (*IdentifierNode) Equal 

func (n *IdentifierNode) Equal(o interface{}) bool

func (*IdentifierNode) Format 

func (n *IdentifierNode) Format(buf *bytes.Buffer, indent string, onNewLine bool)

func (IdentifierNode) Line 

func (p IdentifierNode) Line() int

func (IdentifierNode) Position 

func (p IdentifierNode) Position() int

func (*IdentifierNode) SetComment 

func (n *IdentifierNode) SetComment(c *CommentNode)

func (*IdentifierNode) String 

func (n *IdentifierNode) String() string

type LambdaNode 

type LambdaNode struct {
	Expression Node
	Comment    *CommentNode
	// contains filtered or unexported fields
}

Represents the beginning of a lambda expression

func ParseLambda 

func ParseLambda(text string) (*LambdaNode, error)

Parse returns a LambdaNode, created by parsing a lambda expression.

func (LambdaNode) Char 

func (p LambdaNode) Char() int

func (*LambdaNode) Equal 

func (n *LambdaNode) Equal(o interface{}) bool

func (*LambdaNode) ExpressionString 

func (n *LambdaNode) ExpressionString() string

func (*LambdaNode) Format 

func (n *LambdaNode) Format(buf *bytes.Buffer, indent string, onNewLine bool)

func (LambdaNode) Line 

func (p LambdaNode) Line() int

func (LambdaNode) Position 

func (p LambdaNode) Position() int

func (*LambdaNode) SetComment 

func (n *LambdaNode) SetComment(c *CommentNode)

func (*LambdaNode) String 

func (n *LambdaNode) String() string

type ListNode 

type ListNode struct {
	Nodes   []Node
	Comment *CommentNode
	// contains filtered or unexported fields
}

Holds the list of other nodes

func (ListNode) Char 

func (p ListNode) Char() int

func (*ListNode) Equal 

func (n *ListNode) Equal(o interface{}) bool

func (*ListNode) Format 

func (n *ListNode) Format(buf *bytes.Buffer, indent string, onNewLine bool)

func (ListNode) Line 

func (p ListNode) Line() int

func (ListNode) Position 

func (p ListNode) Position() int

func (*ListNode) SetComment 

func (n *ListNode) SetComment(c *CommentNode)

func (*ListNode) String 

func (n *ListNode) String() string

type Missing added in v1.3.0 

type Missing struct{}

type Node 

type Node interface {
	Position
	String() string
	Format(buf *bytes.Buffer, indent string, onNewLine bool)
	// Report whether to nodes are functionally equal, ignoring position and comments
	Equal(interface{}) bool
}

func Parse 

func Parse(text string) (Node, error)

Parse returns a Node, created by parsing the DSL described in the argument string. If an error is encountered, parsing stops and a nil Node is returned with the error.

func ValueToLiteralNode 

func ValueToLiteralNode(pos Position, v interface{}) (Node, error)

Convert raw value to literal node, for all supported basic types.

func Walk added in v1.3.0 

func Walk(root Node, f func(n Node) (Node, error)) (Node, error)

Walk calls f on all nodes reachable from the root node. The node returned will replace the node provided within the AST. Returning an error from f will stop the walking process and f will not be called on any other nodes.

type NumberNode 

type NumberNode struct {
	IsInt   bool    // Number has an integral value.
	IsFloat bool    // Number has a floating-point value.
	Int64   int64   // The integer value.
	Float64 float64 // The floating-point value.
	Base    int     // The base of an integer value.
	Comment *CommentNode
	// contains filtered or unexported fields
}

numberNode holds a number: signed or unsigned integer or float. The value is parsed and stored under all the types that can represent the value. This simulates in a small amount of code the behavior of Go's ideal constants.

func (NumberNode) Char 

func (p NumberNode) Char() int

func (*NumberNode) Equal 

func (n *NumberNode) Equal(o interface{}) bool

func (*NumberNode) Format 

func (n *NumberNode) Format(buf *bytes.Buffer, indent string, onNewLine bool)

func (NumberNode) Line 

func (p NumberNode) Line() int

func (NumberNode) Position 

func (p NumberNode) Position() int

func (*NumberNode) SetComment 

func (n *NumberNode) SetComment(c *CommentNode)

func (*NumberNode) String 

func (n *NumberNode) String() string

type Position 

type Position interface {
	Position() int // byte position of start of node in full original input string
	Line() int
	Char() int
}

type ProgramNode 

type ProgramNode struct {
	Nodes []Node
	// contains filtered or unexported fields
}

Holds a function call with its args

func (*ProgramNode) Add 

func (n *ProgramNode) Add(node Node)

func (ProgramNode) Char 

func (p ProgramNode) Char() int

func (*ProgramNode) Equal 

func (n *ProgramNode) Equal(o interface{}) bool

func (*ProgramNode) Format 

func (n *ProgramNode) Format(buf *bytes.Buffer, indent string, onNewLine bool)

func (ProgramNode) Line 

func (p ProgramNode) Line() int

func (ProgramNode) Position 

func (p ProgramNode) Position() int

func (*ProgramNode) String 

func (n *ProgramNode) String() string

type ReferenceNode 

type ReferenceNode struct {
	Reference string // The field reference
	Comment   *CommentNode
	// contains filtered or unexported fields
}

Holds the textual representation of an identifier

func (ReferenceNode) Char 

func (p ReferenceNode) Char() int

func (*ReferenceNode) Equal 

func (n *ReferenceNode) Equal(o interface{}) bool

func (*ReferenceNode) Format 

func (n *ReferenceNode) Format(buf *bytes.Buffer, indent string, onNewLine bool)

func (ReferenceNode) Line 

func (p ReferenceNode) Line() int

func (ReferenceNode) Position 

func (p ReferenceNode) Position() int

func (*ReferenceNode) SetComment 

func (n *ReferenceNode) SetComment(c *CommentNode)

func (*ReferenceNode) String 

func (n *ReferenceNode) String() string

type RegexNode 

type RegexNode struct {
	Regex   *regexp.Regexp
	Literal string
	Comment *CommentNode
	// contains filtered or unexported fields
}

Holds the textual representation of a regex literal

func (RegexNode) Char 

func (p RegexNode) Char() int

func (*RegexNode) Equal 

func (n *RegexNode) Equal(o interface{}) bool

func (*RegexNode) Format 

func (n *RegexNode) Format(buf *bytes.Buffer, indent string, onNewLine bool)

func (RegexNode) Line 

func (p RegexNode) Line() int

func (RegexNode) Position 

func (p RegexNode) Position() int

func (*RegexNode) SetComment 

func (n *RegexNode) SetComment(c *CommentNode)

func (*RegexNode) String 

func (n *RegexNode) String() string

type StarNode 

type StarNode struct {
	Comment *CommentNode
	// contains filtered or unexported fields
}

Represents a standalone '*' token.

func (StarNode) Char 

func (p StarNode) Char() int

func (*StarNode) Equal 

func (n *StarNode) Equal(o interface{}) bool

func (*StarNode) Format 

func (n *StarNode) Format(buf *bytes.Buffer, indent string, onNewLine bool)

func (StarNode) Line 

func (p StarNode) Line() int

func (StarNode) Position 

func (p StarNode) Position() int

func (*StarNode) SetComment 

func (n *StarNode) SetComment(c *CommentNode)

func (*StarNode) String 

func (n *StarNode) String() string

type StringNode 

type StringNode struct {
	Literal      string // The string literal
	TripleQuotes bool
	Comment      *CommentNode
	// contains filtered or unexported fields
}

Holds the textual representation of a string literal

func (StringNode) Char 

func (p StringNode) Char() int

func (*StringNode) Equal 

func (n *StringNode) Equal(o interface{}) bool

func (*StringNode) Format 

func (n *StringNode) Format(buf *bytes.Buffer, indent string, onNewLine bool)

func (StringNode) Line 

func (p StringNode) Line() int

func (StringNode) Position 

func (p StringNode) Position() int

func (*StringNode) SetComment 

func (n *StringNode) SetComment(c *CommentNode)

func (*StringNode) String 

func (n *StringNode) String() string

type TokenType 

type TokenType int
const (
	TokenError TokenType = iota
	TokenEOF
	TokenVar
	TokenAsgn
	TokenDot
	TokenPipe
	TokenAt
	TokenIdent
	TokenReference
	TokenLambda
	TokenNumber
	TokenString
	TokenDuration
	TokenLParen
	TokenRParen
	TokenLSBracket
	TokenRSBracket
	TokenComma
	TokenNot
	TokenTrue
	TokenFalse
	TokenRegex
	TokenComment
	TokenStar

	TokenPlus
	TokenMinus
	TokenMult
	TokenDiv
	TokenMod

	TokenAnd
	TokenOr

	TokenEqual
	TokenNotEqual
	TokenLess
	TokenGreater
	TokenLessEqual
	TokenGreaterEqual
	TokenRegexEqual
	TokenRegexNotEqual
)

func (TokenType) String 

func (t TokenType) String() string

String representation of an TokenType

type TypeDeclarationNode 

type TypeDeclarationNode struct {
	Node    *IdentifierNode
	Type    *IdentifierNode
	Comment *CommentNode
	// contains filtered or unexported fields
}

func (TypeDeclarationNode) Char 

func (p TypeDeclarationNode) Char() int

func (*TypeDeclarationNode) Equal 

func (n *TypeDeclarationNode) Equal(o interface{}) bool

func (*TypeDeclarationNode) Format 

func (n *TypeDeclarationNode) Format(buf *bytes.Buffer, indent string, onNewLine bool)

func (TypeDeclarationNode) Line 

func (p TypeDeclarationNode) Line() int

func (TypeDeclarationNode) Position 

func (p TypeDeclarationNode) Position() int

func (*TypeDeclarationNode) SetComment 

func (n *TypeDeclarationNode) SetComment(c *CommentNode)

func (*TypeDeclarationNode) String 

func (n *TypeDeclarationNode) String() string

type UnaryNode 

type UnaryNode struct {
	Node     Node
	Operator TokenType
	Comment  *CommentNode
	// contains filtered or unexported fields
}

unaryNode holds one argument and an operator.

func (UnaryNode) Char 

func (p UnaryNode) Char() int

func (*UnaryNode) Equal 

func (n *UnaryNode) Equal(o interface{}) bool

func (*UnaryNode) Format 

func (n *UnaryNode) Format(buf *bytes.Buffer, indent string, onNewLine bool)

func (UnaryNode) Line 

func (p UnaryNode) Line() int

func (UnaryNode) Position 

func (p UnaryNode) Position() int

func (*UnaryNode) SetComment 

func (n *UnaryNode) SetComment(c *CommentNode)

func (*UnaryNode) String 

func (n *UnaryNode) String() string

type ValueType 

type ValueType uint8
const (
	InvalidType ValueType = iota
	TFloat
	TInt
	TString
	TBool
	TRegex
	TTime
	TDuration
	TLambda
	TList
	TStar
	TMissing
)

func TypeOf 

func TypeOf(v interface{}) ValueType

func (ValueType) String 

func (v ValueType) String() string

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