parser

package
v1.6.0 Latest Latest
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 Go to latest Published: Oct 21, 2022 License: Apache-2.0 Imports: 10 Imported by: 0

Documentation

Index

Constants

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const BASICLIT = 57353
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const BOOL = 57355
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const COMMA = 57354
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const COMMENT = 57360
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const EOF = 0

The parser expects the lexer to return 0 on EOF. Give it a name for clarity.

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const FLOAT = 57358
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const IDENT = 57346
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const ILLEGAL = 57361
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const IMAG = 57359
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const INT = 57357
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const LAND = 57347
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const LOR = 57348
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const LPAREN = 57349
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const NOT = 57351
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const RPAREN = 57350
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const SEMICOLON = 57352
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const STRING = 57356

Variables

This section is empty.

Functions

func Inspect 

func Inspect(node Node, f func(Node) bool)

Inspect traverses an AST in depth-first order: It starts by calling f(node); node must not be nil. If f returns true, Inspect invokes f for all the non-nil children of node, recursively.

func Parse 

func Parse(condStr string) (Node, []*Ident, error)

Parse parse given condition string.

condStr: input condition expression err : err is not nil if parse error(including scan, lexer, prototype check) idents: if err is nil, all conditionVariable is list in idents ([]*Ident) node: if err is nil, parsed ast is returned by node

func Walk 

func Walk(v Visitor, node Node)

Types

type BasicLit 

type BasicLit struct {
	Kind     Token
	Value    string
	ValuePos token.Pos
}

func (*BasicLit) End 

func (b *BasicLit) End() token.Pos

func (*BasicLit) Pos 

func (b *BasicLit) Pos() token.Pos

func (*BasicLit) ToBool 

func (b *BasicLit) ToBool() bool

type BasicLitList 

type BasicLitList []*BasicLit

func (BasicLitList) End 

func (b BasicLitList) End() token.Pos

func (BasicLitList) Pos 

func (b BasicLitList) Pos() token.Pos

type BinaryExpr 

type BinaryExpr struct {
	X  Expr
	Op Token
	Y  Expr
}

func (*BinaryExpr) End 

func (b *BinaryExpr) End() token.Pos

func (*BinaryExpr) Pos 

func (b *BinaryExpr) Pos() token.Pos

type CallExpr 

type CallExpr struct {
	Fun    *Ident
	Args   BasicLitList
	Rparen token.Pos
}

func (*CallExpr) End 

func (c *CallExpr) End() token.Pos

func (*CallExpr) Pos 

func (c *CallExpr) Pos() token.Pos

func (CallExpr) String 

func (c CallExpr) String() string

type Error 

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

func (Error) Error 

func (e Error) Error() string

type ErrorHandler 

type ErrorHandler func(pos token.Pos, msg string)

ErrorHandler is error handler for scanner and lexer

type Expr 

type Expr interface {
	Node
}

type Ident 

type Ident struct {
	Name    string
	NamePos token.Pos
}

func (*Ident) End 

func (id *Ident) End() token.Pos

func (*Ident) Pos 

func (id *Ident) Pos() token.Pos

type Node 

type Node interface {
	Pos() token.Pos
	End() token.Pos
}

type ParenExpr 

type ParenExpr struct {
	X Expr
}

func (ParenExpr) End 

func (p ParenExpr) End() token.Pos

func (ParenExpr) Pos 

func (p ParenExpr) Pos() token.Pos

type Parser 

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

func (*Parser) Error 

func (p *Parser) Error() error

Error return first error.

func (*Parser) Init 

func (p *Parser) Init(src []byte)

func (*Parser) Parse 

func (p *Parser) Parse()

func (Parser) String 

func (p Parser) String() string

String returns string representation of parsed variables and errors.

type Scanner 

type Scanner struct {
	ErrorCount int
	// contains filtered or unexported fields
}

func (*Scanner) Init 

func (s *Scanner) Init(file *token.File, src []byte, err ErrorHandler)

Init prepares the scanner s to tokenize the text src by setting the scanner at the beginning of src. The scanner uses the file set file for position information and it adds line information for each line. It is ok to re-use the same file when re-scanning the same file as line information which is already present is ignored. Init causes a panic if the file size does not match the src size.

Calls to Scan will invoke the error handler err if they encounter a syntax error and err is not nil. Also, for each error encountered, the Scanner field ErrorCount is incremented by one. The mode parameter determines how comments are handled.

Note that Init may call err if there is an error in the first character of the file.

func (*Scanner) Scan 

func (s *Scanner) Scan() (pos token.Pos, tok Token, lit string)

type Token 

type Token int

func Lookup 

func Lookup(ident string) Token

func (Token) String 

func (t Token) String() string

func (Token) Symbol 

func (t Token) Symbol() string

type UnaryExpr 

type UnaryExpr struct {
	X     Expr
	Op    Token
	OpPos token.Pos
}

func (*UnaryExpr) End 

func (u *UnaryExpr) End() token.Pos

func (*UnaryExpr) Pos 

func (u *UnaryExpr) Pos() token.Pos

type Visitor 

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

Visitor wraps the Visit method which is invoked for each node encountered by Walk. If the result visitor w is not nil, Walk visits each of the children of node with the visitor w, followed by a call of w.Visit(nil).

Source Files

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