query

package
v0.20.1 Latest Latest
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This package is not in the latest version of its module.

 Go to latest Published: Aug 17, 2018 License: Apache-2.0 Imports: 9 Imported by: 0

Documentation

Overview

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 https://en.wikipedia.org/wiki/Parsing_expression_grammar. More: https://github.com/PhilippeSigaud/Pegged/wiki/PEG-Basics

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

nolint

Index

Constants

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
)
View Source 
const (
	MultipleValueTagSeparator = ";"
)

Variables

This section is empty.

Functions

func AsQueryable added in v0.20.0 

func AsQueryable(query Query) parsedQuery

func MapFromTagged added in v0.20.0 

func MapFromTagged(tagged Tagged) map[string]interface{}

func MustParse added in v0.20.0 

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 added in v0.20.0 

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

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

func StringFromValue 

func StringFromValue(value interface{}) string

Types

type Builder 

type Builder struct {

	// reusable buffer for building queryString
	bytes.Buffer
	// contains filtered or unexported fields
}

A fluent query builder

func NewBuilder 

func NewBuilder(queries ...string) *Builder

Creates a new query builder with a base query that is the conjunction of all queries passed

func (*Builder) And 

func (qb *Builder) And(queryBuilders ...*Builder) *Builder

Creates the conjunction of Builder and rightQuery

func (*Builder) AndContains 

func (qb *Builder) AndContains(tag string, operand interface{}) *Builder

func (*Builder) AndEquals 

func (qb *Builder) AndEquals(tag string, operand interface{}) *Builder

Creates the conjunction of Builder and tag = operand

func (*Builder) AndGreaterThanOrEqual 

func (qb *Builder) AndGreaterThanOrEqual(tag string, operand interface{}) *Builder

func (*Builder) AndLessThanOrEqual 

func (qb *Builder) AndLessThanOrEqual(tag string, operand interface{}) *Builder

func (*Builder) AndStrictlyGreaterThan 

func (qb *Builder) AndStrictlyGreaterThan(tag string, operand interface{}) *Builder

func (*Builder) AndStrictlyLessThan 

func (qb *Builder) AndStrictlyLessThan(tag string, operand interface{}) *Builder

func (*Builder) Query 

func (qb *Builder) Query() (Query, error)

func (*Builder) String 

func (qb *Builder) String() string

type CombinedTags added in v0.20.0 

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

func ConcatTags added in v0.20.0 

func ConcatTags(tags ...Tagged) *CombinedTags

func MergeTags added in v0.20.0 

func MergeTags(tags ...Tagged) *CombinedTags

func NewCombinedTags added in v0.20.0 

func NewCombinedTags() *CombinedTags

func (*CombinedTags) AddTags added in v0.20.0 

func (ct *CombinedTags) AddTags(concat bool, tagsList ...Tagged)

Adds each of tagsList to CombinedTags - choosing whether values for the same key should be concatenated or whether the first should value should stick

func (*CombinedTags) Get added in v0.20.0 

func (ct *CombinedTags) Get(key string) (string, bool)

func (*CombinedTags) Keys added in v0.20.0 

func (ct *CombinedTags) Keys() []string

func (*CombinedTags) Len added in v0.20.0 

func (ct *CombinedTags) Len() (length int)

type Condition added in v0.20.0 

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

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

type Empty 

type Empty struct {
}

Empty query matches any set of tags.

func (Empty) Matches added in v0.20.0 

func (Empty) Matches(tags Tagged) bool

Matches always returns true.

func (Empty) Query 

func (Empty) Query() (Query, error)

func (Empty) String added in v0.20.0 

func (Empty) String() string

type Operator added in v0.20.0 

type Operator uint8

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

const (
	// "<="
	OpLessEqual Operator = iota
	// ">="
	OpGreaterEqual
	// "<"
	OpLess
	// ">"
	OpGreater
	// "="
	OpEqual
	// "CONTAINS"; used to check if a string contains a certain sub string.
	OpContains
)

type Query 

type Query interface {
	Matches(tags Tagged) bool
	String() string
}

func Must 

func Must(qry Query, err error) Query

type QueryParser added in v0.20.0 

type QueryParser struct {
	Buffer string

	Pretty bool
	// contains filtered or unexported fields
}

func (*QueryParser) AST added in v0.20.0 

func (t *QueryParser) AST() *node32

func (*QueryParser) Add added in v0.20.0 

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

func (*QueryParser) Init added in v0.20.0 

func (p *QueryParser) Init()

func (*QueryParser) Parse added in v0.20.0 

func (p *QueryParser) Parse(rule ...int) error

func (*QueryParser) PrettyPrintSyntaxTree added in v0.20.0 

func (t *QueryParser) PrettyPrintSyntaxTree(buffer string)

func (*QueryParser) Print added in v0.20.0 

func (t *QueryParser) Print()

func (*QueryParser) PrintSyntaxTree added in v0.20.0 

func (p *QueryParser) PrintSyntaxTree()

func (*QueryParser) Reset added in v0.20.0 

func (p *QueryParser) Reset()

func (*QueryParser) Tokens added in v0.20.0 

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

func (*QueryParser) Trim added in v0.20.0 

func (t *QueryParser) Trim(length uint32)

type Queryable 

type Queryable interface {
	Query() (Query, error)
}

func MatchAllQueryable 

func MatchAllQueryable() Queryable

type ReflectTagged added in v0.20.0 

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

func MustReflectTags added in v0.20.0 

func MustReflectTags(value interface{}, fieldNames ...string) *ReflectTagged

func ReflectTags added in v0.20.0 

func ReflectTags(value interface{}, fieldNames ...string) (*ReflectTagged, error)

ReflectTags provides a query.Tagged on a structs exported fields using query.StringFromValue to derive the string values associated with each field. If passed explicit field names will only only provide those fields as tags, otherwise all exported fields are provided.

func (*ReflectTagged) Get added in v0.20.0 

func (rt *ReflectTagged) Get(key string) (value string, ok bool)

func (*ReflectTagged) Keys added in v0.20.0 

func (rt *ReflectTagged) Keys() []string

func (*ReflectTagged) Len added in v0.20.0 

func (rt *ReflectTagged) Len() int

type String 

type String string

A yet-to-parsed query

func (String) Query 

func (qs String) Query() (Query, error)

type TagMap added in v0.20.0 

type TagMap map[string]interface{}

func (TagMap) Get added in v0.20.0 

func (ts TagMap) Get(key string) (value string, ok bool)

func (TagMap) Keys added in v0.20.0 

func (ts TagMap) Keys() []string

func (TagMap) Len added in v0.20.0 

func (ts TagMap) Len() int

func (TagMap) Map added in v0.20.0 

func (ts TagMap) Map() map[string]interface{}

type Tagged added in v0.20.0 

type Tagged interface {
	Keys() []string
	Get(key string) (value string, ok bool)
	// Len returns the number of tags.
	Len() int
}

Source Files

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