parser

package

v0.1.0 Latest Latest Go to latest Published: Jan 10, 2022 License: Apache-2.0 Imports: 6 Imported by: 0

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Valid go.mod file
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Repository

github.com/seldonio/goven

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Documentation ¶

Index ¶

Constants
type Expression
- func (e Expression) String() string
- func (e Expression) Type() string
type Lexer
- func NewLexer(r io.Reader) *Lexer
- func NewLexerFromString(s string) *Lexer
- func (s *Lexer) Scan() TokenInfo
type Node
type Operation
- func (o Operation) String() string
- func (o Operation) Type() string
type Parser
- func NewParser(s string) *Parser
- func (p *Parser) Parse() (Node, error)
type Token
- func (t Token) String() (print string)
type TokenInfo
type TokenStack

Constants ¶

View Source

const (
	OPERATION  = "operation"
	EXPRESSION = "expression"
)

Variables ¶

This section is empty.

Functions ¶

This section is empty.

Types ¶

type Expression ¶

type Expression struct {
	Field      string
	Comparator string
	Value      string
}

Expression represents something like x=y or x>=y

func (Expression) String ¶

func (e Expression) String() string

func (Expression) Type ¶

func (e Expression) Type() string

type Lexer ¶

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

Lexer represents a lexical scanner.

func NewLexer ¶

func NewLexer(r io.Reader) *Lexer

NewLexer returns a new instance of Lexer.

func NewLexerFromString ¶

func NewLexerFromString(s string) *Lexer

func (*Lexer) Scan ¶

func (s *Lexer) Scan() TokenInfo

Scan returns the next token and literal Value.

type Node ¶

type Node interface {
	Type() string
	String() string
}

Node represents a node in the AST after the expression is parsed.

type Operation ¶

type Operation struct {
	LeftNode  Node
	Gate      string
	RightNode Node
}

Operation represents a Node (Operation or Expression) compared with another Node using either `AND` or `OR`.

func (Operation) String ¶

func (o Operation) String() string

func (Operation) Type ¶

func (o Operation) Type() string

type Parser ¶

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

Parser represents a parser, including a scanner and the underlying raw input. It also contains a small buffer to allow for two unscans.

func NewParser ¶

func NewParser(s string) *Parser

NewParser returns a new instance of Parser.

func (*Parser) Parse ¶

func (p *Parser) Parse() (Node, error)

type Token ¶

type Token int

Token represents a lexical token.

const (
	// Special tokens
	// Iota simply starts and integer count
	OTHER Token = iota
	EOF
	WS

	// Main literals
	STRING

	// Brackets
	OPEN_BRACKET
	CLOSED_BRACKET

	// Special characters
	GREATER_THAN
	GREATHER_THAN_EQUAL
	LESS_THAN
	LESS_THAN_EQUAL
	EQUAL
	NOT_EQUAL

	// Keywords
	AND
	OR
)

Declare the tokens here.

func (Token) String ¶

func (t Token) String() (print string)

String prints a human readable string name for a given token.

type TokenInfo ¶

type TokenInfo struct {
	Token   Token
	Literal string
}

TokenInfo stores relevant information about the token during scanning.

type TokenStack ¶

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

TokenStack is used as the buffer for the Parser.

func (*TokenStack) Len ¶

func (s *TokenStack) Len() int

func (*TokenStack) Pop ¶

func (s *TokenStack) Pop() (TokenInfo, error)

func (*TokenStack) Push ¶

func (s *TokenStack) Push(v TokenInfo)

Source Files ¶

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