query

package
v0.1.4 Latest Latest
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 Go to latest Published: Dec 29, 2022 License: BSD-2-Clause Imports: 8 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	TOK_INVALID = iota
	TOK_EOF
	TOK_NL

	TOK_IDENTIFIER
	TOK_KEYWORD
	TOK_NUMBER
	TOK_STRING
	TOK_TOPIC
	TOK_COMMA

	// Arithmetic
	TOK_PLUS
	TOK_MINUS
	TOK_STAR

	// Time
	TOK_WHENCE
	TOK_TIMESPAN

	TOK_PAREN_L
	TOK_PAREN_R

	TOK_ARROW
)

Variables

This section is empty.

Functions

func ParseVagueDateTime 

func ParseVagueDateTime(some string) (time.Time, error)

func Prepare 

func Prepare(d *database.Database, statement string) (database.Filters, error)

Types

type ASTNode 

type ASTNode interface {
	Children() []ASTNode
	GenerateFilter(*database.Database) database.Filter
	Walk(*database.Database) []database.Filter
}

type BaseNode 

type BaseNode struct {
	Value string
	// contains filtered or unexported fields
}

func (*BaseNode) AddChild 

func (b *BaseNode) AddChild(child ASTNode)

func (*BaseNode) Children 

func (b *BaseNode) Children() []ASTNode

func (*BaseNode) GenerateFilter 

func (b *BaseNode) GenerateFilter(_ *database.Database) database.Filter

func (*BaseNode) Walk 

func (b *BaseNode) Walk(d *database.Database) []database.Filter

type BinaryOpNode 

type BinaryOpNode struct {
	BaseNode
}

func (BinaryOpNode) DerivedValue 

func (b BinaryOpNode) DerivedValue() int64

type NumberNode 

type NumberNode struct {
	BaseNode
}

func (NumberNode) DerivedValue 

func (n NumberNode) DerivedValue() int64

type Numeric 

type Numeric interface {
	DerivedValue() int64
}

type Parser 

type Parser struct {
	Scanner Scanner
}

func (*Parser) Parse 

func (p *Parser) Parse() (query ASTNode, err error)

type QuantifierNode 

type QuantifierNode struct {
	BaseNode
}

func (QuantifierNode) GenerateFilter 

func (q QuantifierNode) GenerateFilter(db *database.Database) database.Filter

type QueryNode 

type QueryNode struct {
	BaseNode
}

func (QueryNode) GenerateFilter 

func (q QueryNode) GenerateFilter(_ *database.Database) database.Filter

type Scanner 

type Scanner struct {
	Input     string
	Start     int
	Pos       int
	RuneWidth int
	LastWidth int
}

func (*Scanner) Emit 

func (s *Scanner) Emit() Token

Emit the next Token found on Scanner.Input

func (*Scanner) MatchIdentifier 

func (s *Scanner) MatchIdentifier() int

MatchIdentifier returns the length of the next token, assuming it is an identifier.

Grammar: 

identifier      = 1*(ALPHA / DIGIT)

func (*Scanner) MatchNumber 

func (s *Scanner) MatchNumber() int

MatchNumber returns the length of the next token, assuming it is a number

Grammar: 

number          = 1*DIGIT

func (*Scanner) MatchTimeWhence 

func (s *Scanner) MatchTimeWhence() int

MatchTimeWhence returns the length of the next token, assuming it is a time-whence

Grammar: 

time-whence     = "~now" / "~" RFC3339

func (*Scanner) MatchTimespan 

func (s *Scanner) MatchTimespan() int

MatchTimespan returns the length of the next token, assuming it is a timespan

Grammar: 

timespan        = "@second" / "@minute" / "@hour" / "@day" / "@week" / "@month" / "@year"

func (*Scanner) MatchTopic 

func (s *Scanner) MatchTopic() int

MatchTopic returns the length of the next token, assuming it is a topic string.

Grammar: 

topic           = "/" 1*(ALPHA / DIGIT / "/")

func (*Scanner) Rewind 

func (s *Scanner) Rewind()

Rewind the last read token

func (*Scanner) SkipToBoundary 

func (s *Scanner) SkipToBoundary(boundary boundaryFunc) int

SkipToBoundary returns the number of bytes until the next delimiter. This is useful for skipping over invalid tokens.

type SyntaxError 

type SyntaxError struct {
	Location [2]int
	Message  string
}

func NewSyntaxError 

func NewSyntaxError(t Token, m string) SyntaxError

func (*SyntaxError) FormatError 

func (s *SyntaxError) FormatError(input string) string

type TimeExpressionNode 

type TimeExpressionNode struct {
	BaseNode
}

func (TimeExpressionNode) Time 

func (t TimeExpressionNode) Time() time.Time

type TimePredicateNode 

type TimePredicateNode struct {
	BaseNode
}

func (TimePredicateNode) GenerateFilter 

func (t TimePredicateNode) GenerateFilter(db *database.Database) database.Filter

type TimeWhenceNode 

type TimeWhenceNode struct {
	BaseNode
	When time.Time
}

func (TimeWhenceNode) Time 

func (t TimeWhenceNode) Time() time.Time

type TimespanNode 

type TimespanNode struct {
	BaseNode
}

func (TimespanNode) DerivedValue 

func (t TimespanNode) DerivedValue() int64

type Token 

type Token struct {
	Type     TokenType
	Lexeme   string
	Location [2]int
}

type TokenType 

type TokenType int

func (TokenType) ToString 

func (t TokenType) ToString() string

type TopicNode 

type TopicNode struct {
	BaseNode
}

type TopicSelectorNode 

type TopicSelectorNode struct {
	BaseNode
}

func (TopicSelectorNode) GenerateFilter 

func (q TopicSelectorNode) GenerateFilter(db *database.Database) database.Filter

Source Files

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