Package query provides a parser for a custom query format:

    abci.invoice.number=22 AND abci.invoice.owner=Ivan

    See query.peg for the grammar, which is a More:

    It has a support for numbers (integer and floating point), dates and times.




    View Source
    const (
    	// DateLayout defines a layout for all dates (`DATE date`)
    	DateLayout = "2006-01-02"
    	// TimeLayout defines a layout for all times (`TIME time`)
    	TimeLayout = time.RFC3339


    This section is empty.


    This section is empty.


    type Condition

    type Condition struct {
    	CompositeKey string
    	Op           Operator
    	Operand      interface{}

      Condition represents a single condition within a query and consists of composite key (e.g. "tx.gas"), operator (e.g. "=") and operand (e.g. "7").

      type Empty

      type Empty struct {

        Empty query matches any set of events.

        func (Empty) Matches

        func (Empty) Matches(tags map[string][]string) (bool, error)

          Matches always returns true.

          func (Empty) String

          func (Empty) String() string

          type Operator

          type Operator uint8

            Operator is an operator that defines some kind of relation between composite key and operand (equality, etc.).

            const (
            	// "<="
            	OpLessEqual Operator = iota
            	// ">="
            	// "<"
            	// ">"
            	// "="
            	// "CONTAINS"; used to check if a string contains a certain sub string.
            	// "EXISTS"; used to check if a certain event attribute is present.

            type Query

            type Query struct {
            	// contains filtered or unexported fields

              Query holds the query string and the query parser.

              func MustParse

              func MustParse(s string) *Query

                MustParse turns the given string into a query or panics; for tests or others cases where you know the string is valid.

                func New

                func New(s string) (*Query, error)

                  New parses the given string and returns a query or error if the string is invalid.

                  func (*Query) Conditions

                  func (q *Query) Conditions() ([]Condition, error)

                    Conditions returns a list of conditions. It returns an error if there is any error with the provided grammar in the Query.

                    func (*Query) Matches

                    func (q *Query) Matches(events map[string][]string) (bool, error)

                      Matches returns true if the query matches against any event in the given set of events, false otherwise. For each event, a match exists if the query is matched against *any* value in a slice of values. An error is returned if any attempted event match returns an error.

                      For example, query "name=John" matches events = {"name": ["John", "Eric"]}. More examples could be found in parser_test.go and query_test.go.

                      func (*Query) String

                      func (q *Query) String() string

                        String returns the original string.

                        type QueryParser

                        type QueryParser struct {
                        	Buffer string
                        	Parse  func(rule error
                        	Reset  func()
                        	Pretty bool
                        	// contains filtered or unexported fields

                        func (*QueryParser) AST

                        func (t *QueryParser) AST() *node32

                        func (*QueryParser) Add

                        func (t *QueryParser) Add(rule pegRule, begin, end, depth uint32, index int)

                        func (*QueryParser) Error

                        func (t *QueryParser) Error() []token32

                        func (*QueryParser) Expand

                        func (t *QueryParser) Expand(index int)

                        func (*QueryParser) Highlighter

                        func (p *QueryParser) Highlighter()

                        func (*QueryParser) Init

                        func (p *QueryParser) Init()

                        func (*QueryParser) Order

                        func (t *QueryParser) Order() [][]token32

                        func (*QueryParser) PreOrder

                        func (t *QueryParser) PreOrder() (<-chan state32, [][]token32)

                        func (*QueryParser) Print

                        func (t *QueryParser) Print()

                        func (*QueryParser) PrintSyntax

                        func (t *QueryParser) PrintSyntax()

                        func (*QueryParser) PrintSyntaxTree

                        func (p *QueryParser) PrintSyntaxTree()

                        func (*QueryParser) Tokens

                        func (t *QueryParser) Tokens() <-chan token32


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