query

package
v0.0.0-...-9ec3720 Latest Latest
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 Go to latest Published: Apr 6, 2021 License: AGPL-3.0 Imports: 11 Imported by: 0

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Index

Constants

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const (
	LOWEST = iota
	PCONDOR
	PCONDAND
	EQUALS
	LESSGREATER
	PPRODUCT
	CALL
	INDEX
)

Variables

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var (
	// UnknownToken can be used as a sentinel token for a unknown state.
	UnknownToken = Token{
		Type: UNKNOWN,
	}
)

Functions

func ErrInvalidIdentifier 

func ErrInvalidIdentifier(name string) error

ErrInvalidIdentifier defines a sentinel error for invalid identifiers.

func ForEach 

func ForEach(box Box, fn func(value interface{}) bool)

ForEach will call the function on every value within a Box. If a Box isn't an iterable then we perform a no-op.

func IsInvalidIdentifierErr 

func IsInvalidIdentifierErr(err error) bool

IsInvalidIdentifierErr returns if the error is an ErrInvalidIdentifier error

func IsRuntimeError 

func IsRuntimeError(err error) bool

IsRuntimeError returns if the error is an ErrInvalidIndex error

func RuntimeErrorf 

func RuntimeErrorf(msg string, args ...interface{}) error

RuntimeErrorf defines a sentinel error for invalid index.

Types

type AccessorExpression 

type AccessorExpression struct {
	Token Token
	Right Expression
	Left  Expression
}

AccessorExpression represents an expression that is associated with an operator.

func (*AccessorExpression) End 

func (ie *AccessorExpression) End() Position

End returns the last position of the identifier.

func (*AccessorExpression) Pos 

func (ie *AccessorExpression) Pos() Position

Pos returns the first position of the identifier.

func (*AccessorExpression) String 

func (ie *AccessorExpression) String() string

type Bool 

type Bool struct {
	Token Token
	Value bool
}

Bool represents an bool for a given AST block

func (*Bool) End 

func (i *Bool) End() Position

End returns the last position of the bool.

func (*Bool) Pos 

func (i *Bool) Pos() Position

Pos returns the first position of the bool.

func (*Bool) String 

func (i *Bool) String() string

type Box 

type Box interface {
	Ord

	// IsZero returns if the underlying value is zero.
	IsZero() bool

	// Value defines the shadow type value of the Box.
	Value() interface{}
}

Box represents a boxed datatype.

func ConvertRawResult 

func ConvertRawResult(value interface{}) (Box, error)

type BoxBool 

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

BoxBool defines an ordered float.

func NewBool 

func NewBool(value bool) *BoxBool

NewBool creates a new Box value

func (*BoxBool) Equal 

func (o *BoxBool) Equal(other Ord) bool

Equal checks if an BoxBool is equal to another BoxBool.

func (*BoxBool) ForEach 

func (o *BoxBool) ForEach(fn func(interface{}) bool)

ForEach iterates over each value in the box.

func (*BoxBool) IsZero 

func (o *BoxBool) IsZero() bool

IsZero returns if the underlying value is zero.

func (*BoxBool) Less 

func (o *BoxBool) Less(other Ord) bool

Less checks if a BoxBool is less than another BoxBool.

func (*BoxBool) Value 

func (o *BoxBool) Value() interface{}

Value defines the shadow type value of the Box.

type BoxFloat 

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

BoxFloat defines an ordered float.

func NewFloat 

func NewFloat(value float64) *BoxFloat

NewFloat creates a new Box value

func (*BoxFloat) Equal 

func (o *BoxFloat) Equal(other Ord) bool

Equal checks if an BoxFloat is equal to another BoxFloat.

func (*BoxFloat) ForEach 

func (o *BoxFloat) ForEach(fn func(interface{}) bool)

ForEach iterates over each value in the box.

func (*BoxFloat) IsZero 

func (o *BoxFloat) IsZero() bool

IsZero returns if the underlying value is zero.

func (*BoxFloat) Less 

func (o *BoxFloat) Less(other Ord) bool

Less checks if a BoxFloat is less than another BoxFloat.

func (*BoxFloat) Value 

func (o *BoxFloat) Value() interface{}

Value defines the shadow type value of the Box.

type BoxInteger 

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

BoxInteger defines an ordered integer.

func NewInteger 

func NewInteger(value int64) *BoxInteger

NewInteger creates a new Box value

func (*BoxInteger) Equal 

func (o *BoxInteger) Equal(other Ord) bool

Equal checks if an BoxInteger is equal to another BoxInteger.

func (*BoxInteger) ForEach 

func (o *BoxInteger) ForEach(fn func(interface{}) bool)

ForEach iterates over each value in the box.

func (*BoxInteger) IsZero 

func (o *BoxInteger) IsZero() bool

IsZero returns if the underlying value is zero.

func (*BoxInteger) Less 

func (o *BoxInteger) Less(other Ord) bool

Less checks if a BoxInteger is less than another BoxInteger.

func (*BoxInteger) Value 

func (o *BoxInteger) Value() interface{}

Value defines the shadow type value of the Box.

type BoxLambda 

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

BoxLambda defines an ordered integer.

func NewLambda 

func NewLambda(arg *Identifier, fn func(Scope) ([]Box, error)) *BoxLambda

NewLambda creates a new Box value

func (*BoxLambda) ArgName 

func (o *BoxLambda) ArgName() string

ArgName is the name expected to be seen in the lambda.

func (*BoxLambda) Call 

func (o *BoxLambda) Call(scope Scope) ([]Box, error)

Call the underlying lambda

func (*BoxLambda) Equal 

func (o *BoxLambda) Equal(other Ord) bool

Equal checks if an BoxLambda is equal to another BoxLambda.

func (*BoxLambda) IsZero 

func (o *BoxLambda) IsZero() bool

IsZero returns if the underlying value is zero.

func (*BoxLambda) Less 

func (o *BoxLambda) Less(other Ord) bool

Less checks if a BoxLambda is less than another BoxLambda.

func (*BoxLambda) Value 

func (o *BoxLambda) Value() interface{}

Value defines the shadow type value of the Box.

type BoxMapInterfaceInterface 

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

BoxMapInterfaceInterface defines an ordered map[interface{}]interface{}.

func NewMapInterfaceInterface 

func NewMapInterfaceInterface(value map[interface{}]interface{}) *BoxMapInterfaceInterface

NewMapInterfaceInterface creates a new Box value

func (*BoxMapInterfaceInterface) Equal 

func (o *BoxMapInterfaceInterface) Equal(other Ord) bool

Equal checks if an BoxMapInterfaceInterface is equal to another BoxMapInterfaceInterface.

func (*BoxMapInterfaceInterface) ForEach 

func (o *BoxMapInterfaceInterface) ForEach(fn func(interface{}) bool)

ForEach iterates over each value in the box.

func (*BoxMapInterfaceInterface) IsZero 

func (o *BoxMapInterfaceInterface) IsZero() bool

IsZero returns if the underlying value is zero.

func (*BoxMapInterfaceInterface) Less 

func (o *BoxMapInterfaceInterface) Less(other Ord) bool

Less checks if a BoxMapInterfaceInterface is less than another BoxMapInterfaceInterface.

func (*BoxMapInterfaceInterface) Value 

func (o *BoxMapInterfaceInterface) Value() interface{}

Value defines the shadow type value of the Box.

type BoxMapStringInterface 

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

BoxMapStringInterface defines an ordered map[string]interface{}.

func NewMapStringInterface 

func NewMapStringInterface(value map[string]interface{}) *BoxMapStringInterface

NewMapStringInterface creates a new Box value

func (*BoxMapStringInterface) Equal 

func (o *BoxMapStringInterface) Equal(other Ord) bool

Equal checks if an BoxMapStringInterface is equal to another BoxMapStringInterface.

func (*BoxMapStringInterface) ForEach 

func (o *BoxMapStringInterface) ForEach(fn func(interface{}) bool)

ForEach iterates over each value in the box.

func (*BoxMapStringInterface) IsZero 

func (o *BoxMapStringInterface) IsZero() bool

IsZero returns if the underlying value is zero.

func (*BoxMapStringInterface) Less 

func (o *BoxMapStringInterface) Less(other Ord) bool

Less checks if a BoxMapStringInterface is less than another BoxMapStringInterface.

func (*BoxMapStringInterface) Value 

func (o *BoxMapStringInterface) Value() interface{}

Value defines the shadow type value of the Box.

type BoxNestedScope 

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

BoxNestedScope defines an ordered integer.

func (*BoxNestedScope) Equal 

func (o *BoxNestedScope) Equal(other Ord) bool

Equal checks if an BoxNestedScope is equal to another BoxNestedScope.

func (*BoxNestedScope) IsZero 

func (o *BoxNestedScope) IsZero() bool

IsZero returns if the underlying value is zero.

func (*BoxNestedScope) Less 

func (o *BoxNestedScope) Less(other Ord) bool

Less checks if a BoxNestedScope is less than another BoxNestedScope.

func (*BoxNestedScope) Value 

func (o *BoxNestedScope) Value() interface{}

Value defines the shadow type value of the Box.

type BoxSliceString 

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

BoxSliceString defines an ordered []string.

func NewSliceString 

func NewSliceString(value []string) *BoxSliceString

NewSliceString creates a new Box value

func (*BoxSliceString) Equal 

func (o *BoxSliceString) Equal(other Ord) bool

Equal checks if an BoxSliceString is equal to another BoxSliceString.

func (*BoxSliceString) ForEach 

func (o *BoxSliceString) ForEach(fn func(interface{}) bool)

ForEach iterates over each value in the box.

func (*BoxSliceString) IsZero 

func (o *BoxSliceString) IsZero() bool

IsZero returns if the underlying value is zero.

func (*BoxSliceString) Less 

func (o *BoxSliceString) Less(other Ord) bool

Less checks if a BoxSliceString is less than another BoxSliceString.

func (*BoxSliceString) Value 

func (o *BoxSliceString) Value() interface{}

Value defines the shadow type value of the Box.

type BoxString 

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

BoxString defines an ordered string.

func NewString 

func NewString(value string) *BoxString

NewString creates a new Box value

func (*BoxString) Equal 

func (o *BoxString) Equal(other Ord) bool

Equal checks if an BoxString is equal to another BoxString.

func (*BoxString) ForEach 

func (o *BoxString) ForEach(fn func(interface{}) bool)

ForEach iterates over each value in the box.

func (*BoxString) IsZero 

func (o *BoxString) IsZero() bool

IsZero returns if the underlying value is zero.

func (*BoxString) Less 

func (o *BoxString) Less(other Ord) bool

Less checks if a BoxString is less than another BoxString.

func (*BoxString) Value 

func (o *BoxString) Value() interface{}

Value defines the shadow type value of the Box.

type CallExpression 

type CallExpression struct {
	Token     Token
	Name      Expression
	Arguments []Expression
}

CallExpression represents an expression that is associated with an operator.

func (*CallExpression) End 

func (ie *CallExpression) End() Position

End returns the last position of the identifier.

func (*CallExpression) Pos 

func (ie *CallExpression) Pos() Position

Pos returns the first position of the identifier.

func (*CallExpression) String 

func (ie *CallExpression) String() string

type Empty 

type Empty struct {
	Token Token
}

Empty represents an empty expression

func (*Empty) End 

func (i *Empty) End() Position

End returns the last position of the empty expression.

func (*Empty) Pos 

func (i *Empty) Pos() Position

Pos returns the first position of the empty expression.

func (*Empty) String 

func (i *Empty) String() string

type Expression 

type Expression interface {
	Pos() Position
	End() Position

	String() string
}

Expression defines a type of AST node for outlining an expression.

type ExpressionStatement 

type ExpressionStatement struct {
	Token      Token
	Expression Expression
}

ExpressionStatement is a group of expressions that allows us to group a subset of expressions.

func (*ExpressionStatement) End 

func (es *ExpressionStatement) End() Position

End returns the last position of the expression statement.

func (*ExpressionStatement) Pos 

func (es *ExpressionStatement) Pos() Position

Pos returns the first position of the expression statement.

func (*ExpressionStatement) String 

func (es *ExpressionStatement) String() string

type Float 

type Float struct {
	Token Token
	Value float64
}

Float represents an float for a given AST block

func (*Float) End 

func (i *Float) End() Position

End returns the last position of the float.

func (*Float) Pos 

func (i *Float) Pos() Position

Pos returns the first position of the float.

func (*Float) String 

func (i *Float) String() string

type FuncScope 

type FuncScope interface {
	Add(string, interface{})
	Call(*Identifier, []Box) (interface{}, error)
}

FuncScope is used to call functions for a given identifier.

type GlobalFuncScope 

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

GlobalFuncScope defines a set of builtin functions that can be executed based on a set of arguments.

func NewGlobalFuncScope 

func NewGlobalFuncScope(scope Scope) *GlobalFuncScope

NewGlobalFuncScope creates a new scope for executing functions.

func (*GlobalFuncScope) Add 

func (s *GlobalFuncScope) Add(name string, fn interface{})

Add a function to the global scope.

func (*GlobalFuncScope) Call 

func (s *GlobalFuncScope) Call(ident *Identifier, params []Box) (interface{}, error)

Call a function with a set of arguments.

type Identifier 

type Identifier struct {
	Token Token
}

Identifier represents an identifier for a given AST block

func (*Identifier) End 

func (i *Identifier) End() Position

End returns the last position of the identifier.

func (*Identifier) Pos 

func (i *Identifier) Pos() Position

Pos returns the first position of the identifier.

func (*Identifier) String 

func (i *Identifier) String() string

type IndexExpression 

type IndexExpression struct {
	Token    Token
	Operator string
	Left     Expression
	Index    Expression
}

IndexExpression represents an expression that is associated with an operator.

func (*IndexExpression) End 

func (ie *IndexExpression) End() Position

End returns the last position of the identifier.

func (*IndexExpression) Pos 

func (ie *IndexExpression) Pos() Position

Pos returns the first position of the identifier.

func (*IndexExpression) String 

func (ie *IndexExpression) String() string

type InfixExpression 

type InfixExpression struct {
	Token    Token
	Operator string
	Right    Expression
	Left     Expression
}

AccessorExpression represents an expression that is associated with an operator.

func (*InfixExpression) End 

func (ie *InfixExpression) End() Position

End returns the last position of the identifier.

func (*InfixExpression) Pos 

func (ie *InfixExpression) Pos() Position

Pos returns the first position of the identifier.

func (*InfixExpression) String 

func (ie *InfixExpression) String() string

type InfixFunc 

type InfixFunc func(Expression) Expression

type Integer 

type Integer struct {
	Token Token
	Value int64
}

Integer represents an integer for a given AST block

func (*Integer) End 

func (i *Integer) End() Position

End returns the last position of the integer.

func (*Integer) Pos 

func (i *Integer) Pos() Position

Pos returns the first position of the integer.

func (*Integer) String 

func (i *Integer) String() string

type InvalidIdentifierError 

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

InvalidIdentifierError creates an invalid error.

func (*InvalidIdentifierError) Error 

func (e *InvalidIdentifierError) Error() string

func (*InvalidIdentifierError) Name 

func (e *InvalidIdentifierError) Name() string

Name returns the name associated with the identifier error.

type LambdaExpression 

type LambdaExpression struct {
	Token       Token
	Argument    Expression
	Expressions []Expression
}

LambdaExpression represents an expression that is associated with an operator.

func (*LambdaExpression) End 

func (ie *LambdaExpression) End() Position

End returns the last position of the identifier.

func (*LambdaExpression) Pos 

func (ie *LambdaExpression) Pos() Position

Pos returns the first position of the identifier.

func (*LambdaExpression) String 

func (ie *LambdaExpression) String() string

type Lexer 

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

Lexer takes a query and breaks it down into tokens that can be consumed at at later date. The lexer in question is lazy and requires the calling of next to move it forward.

func NewLexer 

func NewLexer(input string) *Lexer

NewLexer creates a new Lexer from a given input.

func (*Lexer) NextToken 

func (l *Lexer) NextToken() Token

NextToken attempts to grab the next token available.

func (*Lexer) Peek 

func (l *Lexer) Peek() rune

Peek will attempt to read the next rune if it's available.

func (*Lexer) PeekN 

func (l *Lexer) PeekN(n int) rune

PeekN attempts to read the next rune by a given offset, it it's available.

func (*Lexer) ReadNext 

func (l *Lexer) ReadNext()

ReadNext will attempt to read the next character and correctly setup the positional values for the input.

type NestedScope 

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

NestedScope allows scopes to be nested together in a named manor.

func MakeNestedScope 

func MakeNestedScope(base Scope) NestedScope

MakeNestedScope creates a new NestedScope.

func (NestedScope) GetIdentValue 

func (m NestedScope) GetIdentValue(name string) (Box, error)

GetIdentValue returns the value of the identifier in a given scope.

func (NestedScope) GetIdents 

func (m NestedScope) GetIdents() []string

GetIdents returns the identifiers with in a given scope.

func (NestedScope) SetScope 

func (m NestedScope) SetScope(name string, scope Scope)

SetScope will set a scope on a given scope.

type Ord 

type Ord interface {
	// Less checks if a Box is less than another Box
	Less(Ord) bool

	// Equal checks if an Box is equal to another Box.
	Equal(Ord) bool
}

Ord represents an ordered type

type Parser 

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

func NewParser 

func NewParser(lex *Lexer) *Parser

NewParser creates a parser for consuming a lexer tokens.

func (*Parser) Run 

func (p *Parser) Run() (*QueryExpression, error)

Run the parser to the end, which is either an EOF or an error.

type Position 

type Position struct {
	Offset int
	Line   int
	Column int
}

Position holds the location of the token within the query.

func (Position) String 

func (p Position) String() string

type PrefixFunc 

type PrefixFunc func() Expression

type Query 

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

Query holds all the arguments for a given query.

func Parse 

func Parse(src string) (Query, error)

Parse attempts to parse a given query into a argument query. Returns an error if it's not in the correct layout.

func (Query) BuiltinsRun 

func (q Query) BuiltinsRun(scope Scope) (bool, error)

BuiltinsRun runs the query with a set of builtin functions.

func (Query) Run 

func (q Query) Run(fnScope FuncScope, scope Scope) (bool, error)

Run the query over a given scope.

type QueryExpression 

type QueryExpression struct {
	Expressions []Expression
}

QueryExpression represents a query full of expressions

func (*QueryExpression) End 

func (e *QueryExpression) End() Position

End returns the last position of the query expression.

func (*QueryExpression) Pos 

func (e *QueryExpression) Pos() Position

Pos returns the first position of the query expression.

func (*QueryExpression) String 

func (e *QueryExpression) String() string

type RuntimeError 

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

RuntimeError creates an invalid error.

func (*RuntimeError) Error 

func (e *RuntimeError) Error() string

type Scope 

type Scope interface {

	// GetIdents returns the identifiers that are supported for a given scope.
	GetIdents() []string

	// GetIdentValue returns the value of the identifier in a given scope.
	GetIdentValue(string) (Box, error)
}

Scope is used to identify a given expression of a global mutated object.

type String 

type String struct {
	Token Token
}

String represents an string for a given AST block

func (*String) End 

func (i *String) End() Position

End returns the last position of the string.

func (*String) Pos 

func (i *String) Pos() Position

Pos returns the first position of the string.

func (*String) String 

func (i *String) String() string

type Token 

type Token struct {
	Pos     Position
	Type    TokenType
	Literal string
}

Token defines a token found with in a query, along with the position and what type it is.

func MakeToken 

func MakeToken(tokenType TokenType, char rune) Token

MakeToken creates a new token value.

type TokenType 

type TokenType int

TokenType represents a way to identify an individual token. 

const (
	UNKNOWN TokenType = (iota - 1)
	EOF

	IDENT
	INT   //int literal
	FLOAT //float literal
	STRING

	EQ     // ==
	NEQ    // !=
	ASSIGN // =
	BANG   // !

	LT // <
	LE // <=
	GT // >
	GE // >=

	COMMA     // ,
	SEMICOLON // ;

	LPAREN   // (
	RPAREN   // )
	LBRACKET // [
	RBRACKET // ]

	BITAND  // &
	BITOR   // |
	CONDAND // &&
	CONDOR  // ||
	TRUE    // TRUE
	FALSE   // FALSE

	LAMBDA     // =>
	UNDERSCORE // _
	PERIOD     // .
)

func (TokenType) String 

func (t TokenType) String() string

Source Files

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