expr

package
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 Go to latest Published: Dec 25, 2023 License: MIT Imports: 10 Imported by: 0

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Constants

This section is empty.

Variables

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var (
	TrueLiteral  = types.NewBoolValue(true)
	FalseLiteral = types.NewBoolValue(false)
	NullLiteral  = types.NewNullValue()
)

Functions

func Between 

func Between(a Expr) func(x, b Expr) Expr

Between returns a function that creates a BETWEEN operator that returns true if x is between a and b.

func Equal 

func Equal(a, b Expr) bool

Equal reports whether a and b are equal by first calling IsEqual if they have an IsEqual method with this signature: 

IsEqual(Expr) bool

If not, it returns whether a and b values are equal.

func IsArithmeticOperator 

func IsArithmeticOperator(op Operator) bool

IsArithmeticOperator returns true if e is one of +, -, *, /, %, &, |, or ^ operators.

func IsComparisonOperator 

func IsComparisonOperator(op Operator) bool

IsComparisonOperator returns true if e is one of =, !=, >, >=, <, <=, IS, IS NOT, IN, or NOT IN operators.

func Walk 

func Walk(e Expr, fn func(Expr) bool) bool

Types

type Aggregator 

type Aggregator interface {
	Expr

	Aggregate(env *environment.Environment) error
}

An Aggregator is an expression that aggregates objects into one result.

type AggregatorBuilder 

type AggregatorBuilder interface {
	Expr

	Aggregator() Aggregator
}

An AggregatorBuilder is a type that can create aggregators.

type AndOp 

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

AndOp is the And operator.

func (*AndOp) Eval 

func (op *AndOp) Eval(env *environment.Environment) (types.Value, error)

Eval implements the Expr interface. It evaluates a and b and returns true if both evaluate to true.

func (AndOp) IsEqual 

func (op AndOp) IsEqual(other Expr) bool

Equal compares this expression with the other expression and returns true if they are equal.

func (AndOp) LeftHand 

func (op AndOp) LeftHand() Expr

func (AndOp) Precedence 

func (op AndOp) Precedence() int

func (AndOp) RightHand 

func (op AndOp) RightHand() Expr

func (AndOp) SetLeftHandExpr 

func (op AndOp) SetLeftHandExpr(a Expr)

func (AndOp) SetRightHandExpr 

func (op AndOp) SetRightHandExpr(b Expr)

func (AndOp) String 

func (op AndOp) String() string

func (AndOp) Token 

func (op AndOp) Token() scanner.Token

type BetweenOperator 

type BetweenOperator struct {
	X Expr
	// contains filtered or unexported fields
}

func (*BetweenOperator) Eval 

func (op *BetweenOperator) Eval(env *environment.Environment) (types.Value, error)

func (BetweenOperator) IsEqual 

func (op BetweenOperator) IsEqual(other Expr) bool

Equal compares this expression with the other expression and returns true if they are equal.

func (BetweenOperator) LeftHand 

func (op BetweenOperator) LeftHand() Expr

func (BetweenOperator) Precedence 

func (op BetweenOperator) Precedence() int

func (BetweenOperator) RightHand 

func (op BetweenOperator) RightHand() Expr

func (BetweenOperator) SetLeftHandExpr 

func (op BetweenOperator) SetLeftHandExpr(a Expr)

func (BetweenOperator) SetRightHandExpr 

func (op BetweenOperator) SetRightHandExpr(b Expr)

func (*BetweenOperator) String 

func (op *BetweenOperator) String() string

func (BetweenOperator) Token 

func (op BetweenOperator) Token() scanner.Token

type Cast 

type Cast struct {
	Expr   Expr
	CastAs types.ValueType
}

Cast represents the CAST expression.

func (Cast) Eval 

func (c Cast) Eval(env *environment.Environment) (types.Value, error)

Eval returns the primary key of the current object.

func (Cast) IsEqual 

func (c Cast) IsEqual(other Expr) bool

IsEqual compares this expression with the other expression and returns true if they are equal.

func (Cast) Params 

func (c Cast) Params() []Expr

func (Cast) String 

func (c Cast) String() string

type ConcatOperator 

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

func (*ConcatOperator) Eval 

func (op *ConcatOperator) Eval(env *environment.Environment) (types.Value, error)

func (ConcatOperator) IsEqual 

func (op ConcatOperator) IsEqual(other Expr) bool

Equal compares this expression with the other expression and returns true if they are equal.

func (ConcatOperator) LeftHand 

func (op ConcatOperator) LeftHand() Expr

func (ConcatOperator) Precedence 

func (op ConcatOperator) Precedence() int

func (ConcatOperator) RightHand 

func (op ConcatOperator) RightHand() Expr

func (ConcatOperator) SetLeftHandExpr 

func (op ConcatOperator) SetLeftHandExpr(a Expr)

func (ConcatOperator) SetRightHandExpr 

func (op ConcatOperator) SetRightHandExpr(b Expr)

func (ConcatOperator) String 

func (op ConcatOperator) String() string

func (ConcatOperator) Token 

func (op ConcatOperator) Token() scanner.Token

type ConstraintExpr 

type ConstraintExpr struct {
	Expr Expr
}

func Constraint 

func Constraint(e Expr) *ConstraintExpr

func (*ConstraintExpr) Eval 

func (t *ConstraintExpr) Eval(tx *database.Transaction, o types.Object) (types.Value, error)

func (*ConstraintExpr) String 

func (t *ConstraintExpr) String() string

type Expr 

type Expr interface {
	Eval(*environment.Environment) (types.Value, error)
	String() string
}

An Expr evaluates to a value.

func Add 

func Add(a, b Expr) Expr

Add creates an expression thats evaluates to the result of a + b.

func And 

func And(a, b Expr) Expr

And creates an expression that evaluates a And b And returns true if both are truthy.

func BitwiseAnd 

func BitwiseAnd(a, b Expr) Expr

BitwiseAnd creates an expression thats evaluates to the result of a & b.

func BitwiseOr 

func BitwiseOr(a, b Expr) Expr

BitwiseOr creates an expression thats evaluates to the result of a | b.

func BitwiseXor 

func BitwiseXor(a, b Expr) Expr

BitwiseXor creates an expression thats evaluates to the result of a ^ b.

func Concat 

func Concat(a, b Expr) Expr

Concat creates an expression that concatenates two text values together. It returns null if one of the values is not a text.

func Div 

func Div(a, b Expr) Expr

Div creates an expression thats evaluates to the result of a / b.

func Eq 

func Eq(a, b Expr) Expr

Eq creates an expression that returns true if a equals b.

func Gt 

func Gt(a, b Expr) Expr

Gt creates an expression that returns true if a is greater than b.

func Gte 

func Gte(a, b Expr) Expr

Gte creates an expression that returns true if a is greater than or equal to b.

func In 

func In(a, b Expr) Expr

In creates an expression that evaluates to the result of a IN b.

func Is 

func Is(a, b Expr) Expr

Is creates an expression that evaluates to the result of a IS b.

func IsNot 

func IsNot(a, b Expr) Expr

IsNot creates an expression that evaluates to the result of a IS NOT b.

func Like 

func Like(a, b Expr) Expr

Like creates an expression that evaluates to the result of a LIKE b.

func Lt 

func Lt(a, b Expr) Expr

Lt creates an expression that returns true if a is lesser than b.

func Lte 

func Lte(a, b Expr) Expr

Lte creates an expression that returns true if a is lesser than or equal to b.

func Mod 

func Mod(a, b Expr) Expr

Mod creates an expression thats evaluates to the result of a % b.

func Mul 

func Mul(a, b Expr) Expr

Mul creates an expression thats evaluates to the result of a * b.

func Neq 

func Neq(a, b Expr) Expr

Neq creates an expression that returns true if a equals b.

func Not 

func Not(e Expr) Expr

Not creates an expression that returns true if e is falsy.

func NotIn 

func NotIn(a, b Expr) Expr

NotIn creates an expression that evaluates to the result of a NOT IN b.

func NotLike 

func NotLike(a, b Expr) Expr

NotLike creates an expression that evaluates to the result of a NOT LIKE b.

func Or 

func Or(a, b Expr) Expr

Or creates an expression that first evaluates a, returns true if truthy, then evaluates b, returns true if truthy Or false if falsy.

func Sub 

func Sub(a, b Expr) Expr

Sub creates an expression thats evaluates to the result of a - b.

type Function 

type Function interface {
	Expr

	// Params returns the list of parameters this function has received.
	Params() []Expr
}

A Function is an expression whose evaluation calls a function previously defined.

type InOperator 

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

func (*InOperator) Eval 

func (op *InOperator) Eval(env *environment.Environment) (types.Value, error)

func (InOperator) IsEqual 

func (op InOperator) IsEqual(other Expr) bool

Equal compares this expression with the other expression and returns true if they are equal.

func (InOperator) LeftHand 

func (op InOperator) LeftHand() Expr

func (InOperator) Precedence 

func (op InOperator) Precedence() int

func (InOperator) RightHand 

func (op InOperator) RightHand() Expr

func (InOperator) SetLeftHandExpr 

func (op InOperator) SetLeftHandExpr(a Expr)

func (InOperator) SetRightHandExpr 

func (op InOperator) SetRightHandExpr(b Expr)

func (InOperator) String 

func (op InOperator) String() string

func (InOperator) Token 

func (op InOperator) Token() scanner.Token

type IsNotOperator 

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

func (*IsNotOperator) Eval 

func (op *IsNotOperator) Eval(env *environment.Environment) (types.Value, error)

func (IsNotOperator) IsEqual 

func (op IsNotOperator) IsEqual(other Expr) bool

Equal compares this expression with the other expression and returns true if they are equal.

func (IsNotOperator) LeftHand 

func (op IsNotOperator) LeftHand() Expr

func (IsNotOperator) Precedence 

func (op IsNotOperator) Precedence() int

func (IsNotOperator) RightHand 

func (op IsNotOperator) RightHand() Expr

func (IsNotOperator) SetLeftHandExpr 

func (op IsNotOperator) SetLeftHandExpr(a Expr)

func (IsNotOperator) SetRightHandExpr 

func (op IsNotOperator) SetRightHandExpr(b Expr)

func (*IsNotOperator) String 

func (op *IsNotOperator) String() string

func (IsNotOperator) Token 

func (op IsNotOperator) Token() scanner.Token

type IsOperator 

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

func (*IsOperator) Eval 

func (op *IsOperator) Eval(env *environment.Environment) (types.Value, error)

func (IsOperator) IsEqual 

func (op IsOperator) IsEqual(other Expr) bool

Equal compares this expression with the other expression and returns true if they are equal.

func (IsOperator) LeftHand 

func (op IsOperator) LeftHand() Expr

func (IsOperator) Precedence 

func (op IsOperator) Precedence() int

func (IsOperator) RightHand 

func (op IsOperator) RightHand() Expr

func (IsOperator) SetLeftHandExpr 

func (op IsOperator) SetLeftHandExpr(a Expr)

func (IsOperator) SetRightHandExpr 

func (op IsOperator) SetRightHandExpr(b Expr)

func (IsOperator) String 

func (op IsOperator) String() string

func (IsOperator) Token 

func (op IsOperator) Token() scanner.Token

type KVPair 

type KVPair struct {
	K string
	V Expr
}

KVPair associates an identifier with an expression.

func (KVPair) String 

func (p KVPair) String() string

String implements the fmt.Stringer interface.

type KVPairs 

type KVPairs struct {
	Pairs          []KVPair
	SelfReferenced bool
}

KVPairs is a list of KVPair.

func (*KVPairs) Eval 

func (kvp *KVPairs) Eval(env *environment.Environment) (types.Value, error)

Eval turns a list of KVPairs into an object.

func (*KVPairs) IsEqual 

func (kvp *KVPairs) IsEqual(other Expr) bool

IsEqual compares this expression with the other expression and returns true if they are equal.

func (*KVPairs) String 

func (kvp *KVPairs) String() string

String implements the fmt.Stringer interface.

type LikeOperator 

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

func (*LikeOperator) Eval 

func (op *LikeOperator) Eval(env *environment.Environment) (types.Value, error)

func (LikeOperator) IsEqual 

func (op LikeOperator) IsEqual(other Expr) bool

Equal compares this expression with the other expression and returns true if they are equal.

func (LikeOperator) LeftHand 

func (op LikeOperator) LeftHand() Expr

func (LikeOperator) Precedence 

func (op LikeOperator) Precedence() int

func (LikeOperator) RightHand 

func (op LikeOperator) RightHand() Expr

func (LikeOperator) SetLeftHandExpr 

func (op LikeOperator) SetLeftHandExpr(a Expr)

func (LikeOperator) SetRightHandExpr 

func (op LikeOperator) SetRightHandExpr(b Expr)

func (LikeOperator) String 

func (op LikeOperator) String() string

func (LikeOperator) Token 

func (op LikeOperator) Token() scanner.Token

type LiteralExprList 

type LiteralExprList []Expr

LiteralExprList is a list of expressions.

func (LiteralExprList) Eval 

func (l LiteralExprList) Eval(env *environment.Environment) (types.Value, error)

Eval evaluates all the expressions and returns a literalValueList. It implements the Expr interface.

func (LiteralExprList) IsEqual 

func (l LiteralExprList) IsEqual(other Expr) bool

IsEqual compares this expression with the other expression and returns true if they are equal.

func (LiteralExprList) String 

func (l LiteralExprList) String() string

String implements the fmt.Stringer interface.

type LiteralValue 

type LiteralValue struct {
	Value types.Value
}

A LiteralValue represents a literal value of any type defined by the value package.

func (LiteralValue) Eval 

func (v LiteralValue) Eval(*environment.Environment) (types.Value, error)

Eval returns l. It implements the Expr interface.

func (LiteralValue) IsEqual 

func (v LiteralValue) IsEqual(other Expr) bool

IsEqual compares this expression with the other expression and returns true if they are equal.

func (LiteralValue) String 

func (v LiteralValue) String() string

String implements the fmt.Stringer interface.

type NamedExpr 

type NamedExpr struct {
	Expr

	ExprName string
}

NamedExpr is an expression with a name.

func (*NamedExpr) Name 

func (e *NamedExpr) Name() string

Name returns ExprName.

func (*NamedExpr) String 

func (e *NamedExpr) String() string

type NamedParam 

type NamedParam string

NamedParam is an expression which represents the name of a parameter.

func (NamedParam) Eval 

func (p NamedParam) Eval(env *environment.Environment) (types.Value, error)

Eval looks up for the parameters in the env for the one that has the same name as p and returns the value.

func (NamedParam) IsEqual 

func (p NamedParam) IsEqual(other Expr) bool

IsEqual compares this expression with the other expression and returns true if they are equal.

func (NamedParam) String 

func (p NamedParam) String() string

String implements the fmt.Stringer interface.

type NextValueFor 

type NextValueFor struct {
	SeqName string
}

func (NextValueFor) Eval 

func (n NextValueFor) Eval(env *environment.Environment) (types.Value, error)

Eval calls the underlying expression Eval method.

func (NextValueFor) IsEqual 

func (n NextValueFor) IsEqual(other Expr) bool

IsEqual compares this expression with the other expression and returns true if they are equal.

func (NextValueFor) String 

func (n NextValueFor) String() string

type NotInOperator 

type NotInOperator struct {
	InOperator
}

func (*NotInOperator) Eval 

func (op *NotInOperator) Eval(env *environment.Environment) (types.Value, error)

func (NotInOperator) IsEqual 

func (op NotInOperator) IsEqual(other Expr) bool

Equal compares this expression with the other expression and returns true if they are equal.

func (NotInOperator) LeftHand 

func (op NotInOperator) LeftHand() Expr

func (NotInOperator) Precedence 

func (op NotInOperator) Precedence() int

func (NotInOperator) RightHand 

func (op NotInOperator) RightHand() Expr

func (NotInOperator) SetLeftHandExpr 

func (op NotInOperator) SetLeftHandExpr(a Expr)

func (NotInOperator) SetRightHandExpr 

func (op NotInOperator) SetRightHandExpr(b Expr)

func (*NotInOperator) String 

func (op *NotInOperator) String() string

func (NotInOperator) Token 

func (op NotInOperator) Token() scanner.Token

type NotLikeOperator 

type NotLikeOperator struct {
	*LikeOperator
}

func (*NotLikeOperator) Eval 

func (op *NotLikeOperator) Eval(env *environment.Environment) (types.Value, error)

func (NotLikeOperator) IsEqual 

func (op NotLikeOperator) IsEqual(other Expr) bool

Equal compares this expression with the other expression and returns true if they are equal.

func (NotLikeOperator) LeftHand 

func (op NotLikeOperator) LeftHand() Expr

func (NotLikeOperator) Precedence 

func (op NotLikeOperator) Precedence() int

func (NotLikeOperator) RightHand 

func (op NotLikeOperator) RightHand() Expr

func (NotLikeOperator) SetLeftHandExpr 

func (op NotLikeOperator) SetLeftHandExpr(a Expr)

func (NotLikeOperator) SetRightHandExpr 

func (op NotLikeOperator) SetRightHandExpr(b Expr)

func (*NotLikeOperator) String 

func (op *NotLikeOperator) String() string

func (NotLikeOperator) Token 

func (op NotLikeOperator) Token() scanner.Token

type NotOp 

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

NotOp is the NOT unary operator.

func (*NotOp) Eval 

func (op *NotOp) Eval(env *environment.Environment) (types.Value, error)

Eval implements the Expr interface. It evaluates e and returns true if b is falsy

func (NotOp) IsEqual 

func (op NotOp) IsEqual(other Expr) bool

Equal compares this expression with the other expression and returns true if they are equal.

func (NotOp) LeftHand 

func (op NotOp) LeftHand() Expr

func (NotOp) Precedence 

func (op NotOp) Precedence() int

func (NotOp) RightHand 

func (op NotOp) RightHand() Expr

func (NotOp) SetLeftHandExpr 

func (op NotOp) SetLeftHandExpr(a Expr)

func (NotOp) SetRightHandExpr 

func (op NotOp) SetRightHandExpr(b Expr)

func (*NotOp) String 

func (op *NotOp) String() string

String implements the fmt.Stringer interface.

func (NotOp) Token 

func (op NotOp) Token() scanner.Token

type Operator 

type Operator interface {
	Expr

	Precedence() int
	LeftHand() Expr
	RightHand() Expr
	SetLeftHandExpr(Expr)
	SetRightHandExpr(Expr)
	Token() scanner.Token
}

An Operator is a binary expression that takes two operands and executes an operation on them.

type OrOp 

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

OrOp is the Or operator.

func (*OrOp) Eval 

func (op *OrOp) Eval(env *environment.Environment) (types.Value, error)

Eval implements the Expr interface. It evaluates a and b and returns true if a or b evalutate to true.

func (OrOp) IsEqual 

func (op OrOp) IsEqual(other Expr) bool

Equal compares this expression with the other expression and returns true if they are equal.

func (OrOp) LeftHand 

func (op OrOp) LeftHand() Expr

func (OrOp) Precedence 

func (op OrOp) Precedence() int

func (OrOp) RightHand 

func (op OrOp) RightHand() Expr

func (OrOp) SetLeftHandExpr 

func (op OrOp) SetLeftHandExpr(a Expr)

func (OrOp) SetRightHandExpr 

func (op OrOp) SetRightHandExpr(b Expr)

func (OrOp) String 

func (op OrOp) String() string

func (OrOp) Token 

func (op OrOp) Token() scanner.Token

type Parentheses 

type Parentheses struct {
	E Expr
}

Parentheses is a special expression which turns any sub-expression as unary. It hides the underlying operator, if any, from the parser so that it doesn't get reordered by precedence.

func (Parentheses) Eval 

func (p Parentheses) Eval(env *environment.Environment) (types.Value, error)

Eval calls the underlying expression Eval method.

func (Parentheses) IsEqual 

func (p Parentheses) IsEqual(other Expr) bool

IsEqual compares this expression with the other expression and returns true if they are equal.

func (Parentheses) String 

func (p Parentheses) String() string

type Path 

type Path object.Path

A Path is an expression that extracts a value from a object at a given path.

func (Path) Eval 

func (p Path) Eval(env *environment.Environment) (types.Value, error)

Eval extracts the current value from the environment and returns the value stored at p. It implements the Expr interface.

func (Path) IsEqual 

func (p Path) IsEqual(other Expr) bool

IsEqual compares this expression with the other expression and returns true if they are equal.

func (Path) String 

func (p Path) String() string

type PositionalParam 

type PositionalParam int

PositionalParam is an expression which represents the position of a parameter.

func (PositionalParam) Eval 

func (p PositionalParam) Eval(env *environment.Environment) (types.Value, error)

Eval looks up for the parameters in the env for the one that is has the same position as p and returns the value.

func (PositionalParam) IsEqual 

func (p PositionalParam) IsEqual(other Expr) bool

IsEqual compares this expression with the other expression and returns true if they are equal.

func (PositionalParam) String 

func (p PositionalParam) String() string

String implements the fmt.Stringer interface.

type Wildcard 

type Wildcard struct{}

A Wildcard is an expression that iterates over all the fields of a object.

func (Wildcard) Eval 

func (w Wildcard) Eval(env *environment.Environment) (types.Value, error)

func (Wildcard) Iterate 

func (w Wildcard) Iterate(env environment.Environment, fn func(field string, value types.Value) error) error

Iterate call the object iterate method.

func (Wildcard) String 

func (w Wildcard) String() string

Source Files

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Directories

Path Synopsis
Package glob implements wildcard pattern matching algorithms for strings.
 Package glob implements wildcard pattern matching algorithms for strings.

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