filter

README

Filter Syntax

Pivot uses a simplified filter syntax that is URL-friendly and fairly straightforward to use. It consists of a sequence of field/value pairs that are themselves separated by a forward slash. Generally, the best way to learn this syntax is through examples:

Examples

# Where field "id" is exactly equal to 123
id/123

# Where "id" is exactly 3, 14, OR 27
id/3|14|27

# Where "id" is exactly 3, 14, OR 27 AND "enabled" is true
id/3|14|27/enabled/true

# Where "name" is "Bob" AND "age" is 42.
name/Bob/age/42

# Where "product" contains the string "usb" and "price" is less than 5.00
product/contains:usb/price/lt:5.00

# Where "product" contains the string "usb" and "price" is between 10.00 (inclusive) and 20.01 (exclusive)
product/contains:usb/price/range:10|20.01

General Form

The general form of this filter syntax is:

[[type:]field/[operator:]value[|orvalue ..] ..]

Operators

Supported operators are as follows:

Operator	Description
is	Values must exactly match (this is the default if no operator is provided)
not	Values may be anything except an exact match
contains	String value must contain the given substring (case sensitive)
like	String value must contain the given substring (case insensitive)
unlike	String value may not contain the given substring (case insensitive)
prefix	String value must start with the given string
suffix	String value must end with the given string
gt	Numeric or date value must be strictly greater than
gte	Numeric or date value must be strictly greater than or equal to
lt	Numeric or date value must be strictly less than
lte	Numeric or date value must be strictly less than or equal to
range	Numeric or date value must be between two values (separated by `

Documentation

Index

• Variables
• func IsExactMatchOperator(operator string) bool
• func IsInvertingOperator(operator string) bool
• func Render(generator IGenerator, collectionName string, filter *Filter) ([]byte, error)
• func SplitModifierToken(in string) (string, string)
• type Aggregate
• type Aggregation
• type ConjunctionType
• type Criterion
  • func (self *Criterion) IsExactMatch() bool
  • func (self *Criterion) String() string
• type Filter
  • func All() *Filter
  • func Copy(other *Filter) Filter
  • func FromMap(in map[string]interface{}) (*Filter, error)
  • func MakeFilter(specs ...string) Filter
  • func MustParse(spec string) *Filter
  • func New() *Filter
  • func Null() *Filter
  • func Parse(in interface{}) (*Filter, error)
  • func ParseSpec(spec string) (*Filter, error)
  • func (self *Filter) AddCriteria(criteria ...Criterion) *Filter
  • func (self *Filter) ApplyOptions(in interface{}) error
  • func (self *Filter) BoundedBy(limit int, offset int) *Filter
  • func (self *Filter) CriteriaFields() []string
  • func (self *Filter) GetFirstValue() (interface{}, bool)
  • func (self *Filter) GetIdentityValue() (interface{}, bool)
  • func (self *Filter) GetSort() []SortBy
  • func (self *Filter) GetValues(field string) ([]interface{}, bool)
  • func (self *Filter) IdOnly() bool
  • func (self *Filter) IsMatchAll() bool
  • func (self *Filter) MatchesRecord(record *dal.Record) bool
  • func (self *Filter) NewFromMap(in map[string]interface{}) (*Filter, error)
  • func (self *Filter) NewFromSpec(specs ...string) (*Filter, error)
  • func (self *Filter) SortBy(fields ...string) *Filter
  • func (self *Filter) String() string
  • func (self *Filter) WithFields(fields ...string) *Filter
• type Generator
  • func (self *Generator) Finalize(_ *Filter) error
  • func (self *Generator) Payload() []byte
  • func (self *Generator) Push(data []byte)
  • func (self *Generator) Reset()
  • func (self *Generator) Set(data []byte)
• type IGenerator
• type NormalizerFunc
• type SortBy

Variables

var AllValue = `all`

var CriteriaSeparator = `/`

var DefaultIdentityField = `id`

var DefaultNormalizerFunc = func(in string) string {
	in = strings.ToLower(in)
	return rxCharFilter.ReplaceAllString(in, ``)
}

var FieldLengthDelimiter = `#`

var FieldTermSeparator = `/`

var ModifierDelimiter = `:`

var QueryUnescapeValues = false

var SortAscending = `+`

var SortDescending = `-`

var ValueSeparator = `|`

Functions

func IsExactMatchOperator

func IsExactMatchOperator(operator string) bool

func IsInvertingOperator

func IsInvertingOperator(operator string) bool

func Render

func Render(generator IGenerator, collectionName string, filter *Filter) ([]byte, error)

func SplitModifierToken

func SplitModifierToken(in string) (string, string)

Types

type Aggregate

type Aggregate struct {
	Aggregation Aggregation
	Field       string
}

type Aggregation

type Aggregation int

const (
	First Aggregation = iota
	Last
	Minimum
	Maximum
	Sum
	Average
	Count
)

type ConjunctionType

type ConjunctionType string

const (
	AndConjunction ConjunctionType = ``
	OrConjunction                  = `or`
)

type Criterion

type Criterion struct {
	Type        dal.Type      `json:"type,omitempty"`
	Length      int           `json:"length,omitempty"`
	Field       string        `json:"field"`
	Operator    string        `json:"operator,omitempty"`
	Values      []interface{} `json:"values"`
	Aggregation Aggregation   `json:"aggregation,omitempty"`
}

func (*Criterion) IsExactMatch

func (self *Criterion) IsExactMatch() bool

func (*Criterion) String

func (self *Criterion) String() string

type Filter

type Filter struct {
	Spec          string
	MatchAll      bool
	Offset        int
	Limit         int
	Criteria      []Criterion
	Sort          []string
	Fields        []string
	Options       map[string]interface{}
	Paginate      bool
	IdentityField string
	Normalizer    NormalizerFunc `json:"-" bson:"-" pivot:"-"`
	Conjunction   ConjunctionType
}

func All

func All() *Filter

func Copy

func Copy(other *Filter) Filter

func FromMap

func FromMap(in map[string]interface{}) (*Filter, error)

func MakeFilter

func MakeFilter(specs ...string) Filter

func MustParse

func MustParse(spec string) *Filter

func New

func New() *Filter

func Null

func Null() *Filter

func Parse

func Parse(in interface{}) (*Filter, error)

func ParseSpec

func ParseSpec(spec string) (*Filter, error)

Filter syntax definition

func (*Filter) AddCriteria

func (self *Filter) AddCriteria(criteria ...Criterion) *Filter

func (*Filter) ApplyOptions

func (self *Filter) ApplyOptions(in interface{}) error

func (*Filter) BoundedBy

func (self *Filter) BoundedBy(limit int, offset int) *Filter

func (*Filter) CriteriaFields

func (self *Filter) CriteriaFields() []string

func (*Filter) GetFirstValue

func (self *Filter) GetFirstValue() (interface{}, bool)

func (*Filter) GetIdentityValue

func (self *Filter) GetIdentityValue() (interface{}, bool)

func (*Filter) GetSort

func (self *Filter) GetSort() []SortBy

func (*Filter) GetValues

func (self *Filter) GetValues(field string) ([]interface{}, bool)

func (*Filter) IdOnly

func (self *Filter) IdOnly() bool

func (*Filter) IsMatchAll

func (self *Filter) IsMatchAll() bool

func (*Filter) MatchesRecord

func (self *Filter) MatchesRecord(record *dal.Record) bool

func (*Filter) NewFromMap

func (self *Filter) NewFromMap(in map[string]interface{}) (*Filter, error)

func (*Filter) NewFromSpec

func (self *Filter) NewFromSpec(specs ...string) (*Filter, error)

func (*Filter) SortBy

func (self *Filter) SortBy(fields ...string) *Filter

func (*Filter) String

func (self *Filter) String() string

func (*Filter) WithFields

func (self *Filter) WithFields(fields ...string) *Filter

type Generator

type Generator struct {
	IGenerator
	// contains filtered or unexported fields
}

func (*Generator) Finalize

func (self *Generator) Finalize(_ *Filter) error

func (*Generator) Payload

func (self *Generator) Payload() []byte

func (*Generator) Push

func (self *Generator) Push(data []byte)

func (*Generator) Reset

func (self *Generator) Reset()

func (*Generator) Set

func (self *Generator) Set(data []byte)

type IGenerator

type IGenerator interface {
	Initialize(string) error
	Finalize(*Filter) error
	Push([]byte)
	Set([]byte)
	Payload() []byte
	WithCriterion(Criterion) error
	OrCriterion(Criterion) error
	WithField(string) error
	GroupByField(string) error
	AggregateByField(Aggregation, string) error
	SetOption(string, interface{}) error
	GetValues() []interface{}
	Reset()
}

type NormalizerFunc

type NormalizerFunc func(in string) string // {}

type SortBy

type SortBy struct {
	Field      string
	Descending bool
}