expressions

package
v0.0.0-...-e6fb8a6 Latest Latest
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 Go to latest Published: Aug 16, 2022 License: Apache-2.0 Imports: 6 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func All 

func All(validators ...IValidator) *all

func AllArgs 

func AllArgs(validator ISingleArgumentValidator) *allArgs

func Arg 

func Arg(i int, validator ISingleArgumentValidator) *arg

func AtLeastNArgs 

func AtLeastNArgs(n int) *atLeastNArgs

func AtMostNArgs 

func AtMostNArgs(n int) *atMostNArgs

func ExactlyNArgs 

func ExactlyNArgs(n int) *exactlyNArgs

func IfArgPresent 

func IfArgPresent(i int, validator IValidator) *ifArgPresent

func OneOf 

func OneOf(validators ...IValidator) *oneOf

func SameFamily 

func SameFamily(f datavalues.Family) *sameFamily

func SameType 

func SameType(idx ...int) *sameType

func SingleOneOf 

func SingleOneOf(validators ...ISingleArgumentValidator) *singleOneOf

func TypeOf 

func TypeOf(wantedType datavalues.IDataValue) *typeOf

func Walk 

func Walk(visit Visit, exprs ...IExpression) error

Types

type AggregateExpression 

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

func (*AggregateExpression) Document 

func (e *AggregateExpression) Document() docs.Documentation

func (*AggregateExpression) Eval 

func (e *AggregateExpression) Eval() error

func (*AggregateExpression) Merge 

func (e *AggregateExpression) Merge(arg IExpression) (datavalues.IDataValue, error)

func (*AggregateExpression) Result 

func (e *AggregateExpression) Result() datavalues.IDataValue

func (*AggregateExpression) String 

func (e *AggregateExpression) String() string

func (*AggregateExpression) Update 

func (e *AggregateExpression) Update(params IParams) (datavalues.IDataValue, error)

func (*AggregateExpression) Walk 

func (e *AggregateExpression) Walk(visit Visit) error

type AliasedExpression 

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

func NewAliasedExpression 

func NewAliasedExpression(name string, expr IExpression) *AliasedExpression

func (*AliasedExpression) Document 

func (e *AliasedExpression) Document() docs.Documentation

func (*AliasedExpression) Eval 

func (e *AliasedExpression) Eval() error

func (*AliasedExpression) Merge 

func (e *AliasedExpression) Merge(arg IExpression) (datavalues.IDataValue, error)

func (*AliasedExpression) Result 

func (e *AliasedExpression) Result() datavalues.IDataValue

func (*AliasedExpression) String 

func (e *AliasedExpression) String() string

func (*AliasedExpression) Update 

func (e *AliasedExpression) Update(params IParams) (datavalues.IDataValue, error)

func (*AliasedExpression) Walk 

func (e *AliasedExpression) Walk(visit Visit) error

type BinaryExpression 

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

func (*BinaryExpression) Document 

func (e *BinaryExpression) Document() docs.Documentation

func (*BinaryExpression) Eval 

func (e *BinaryExpression) Eval() error

func (*BinaryExpression) Merge 

func (e *BinaryExpression) Merge(arg IExpression) (datavalues.IDataValue, error)

func (*BinaryExpression) Result 

func (e *BinaryExpression) Result() datavalues.IDataValue

func (*BinaryExpression) String 

func (e *BinaryExpression) String() string

func (*BinaryExpression) Update 

func (e *BinaryExpression) Update(params IParams) (datavalues.IDataValue, error)

func (*BinaryExpression) Walk 

func (e *BinaryExpression) Walk(visit Visit) error

type ConstantExpression 

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

ConstantExpression 常量表达式，返回给定的值

func NewConstantExpression 

func NewConstantExpression(v datavalues.IDataValue) *ConstantExpression

func (*ConstantExpression) Document 

func (e *ConstantExpression) Document() docs.Documentation

func (*ConstantExpression) Eval 

func (e *ConstantExpression) Eval() error

Eval 常量不能被执行

func (*ConstantExpression) Merge 

func (e *ConstantExpression) Merge(arg IExpression) (datavalues.IDataValue, error)

Merge 妈的常量值竟然能被覆盖掉？

func (*ConstantExpression) Result 

func (e *ConstantExpression) Result() datavalues.IDataValue

Result 返回最终的常量

func (*ConstantExpression) String 

func (e *ConstantExpression) String() string

func (*ConstantExpression) Update 

func (e *ConstantExpression) Update(params IParams) (datavalues.IDataValue, error)

Update 常量没有参数

func (*ConstantExpression) Walk 

func (e *ConstantExpression) Walk(visit Visit) error

Walk 遍历表达式

type IExpression 

type IExpression interface {

	// Eval 执行表达式
	Eval() error

	// Result 获取表达式的执行结果
	Result() datavalues.IDataValue

	// Update 设置表达式的参数
	Update(params IParams) (datavalues.IDataValue, error)

	// Merge 合并多个表达式的结果
	Merge(arg IExpression) (datavalues.IDataValue, error)

	Walk(visit Visit) error

	String() string

	// Document 表达式的执行结果
	Document() docs.Documentation
}

IExpression 表示SQL中的一个表达式

func ADD 

func ADD(left interface{}, right interface{}) IExpression

func ALIASED 

func ALIASED(name string, expr IExpression) IExpression

func AND 

func AND(left interface{}, right interface{}) IExpression

func CONST 

func CONST(v interface{}) IExpression

CONST 创建一个常量表达式

func COUNT 

func COUNT(arg interface{}) IExpression

func DIV 

func DIV(left interface{}, right interface{}) IExpression

func EQ 

func EQ(left interface{}, right interface{}) IExpression

func ExpressionFactory 

func ExpressionFactory(name string, args []interface{}) (IExpression, error)

func GT 

func GT(left interface{}, right interface{}) IExpression

func GTE 

func GTE(left interface{}, right interface{}) IExpression

func IF 

func IF(args ...interface{}) IExpression

IF 条件表达式

func LIKE 

func LIKE(left interface{}, right interface{}) IExpression

func LOGMOCK 

func LOGMOCK(args ...interface{}) IExpression

func LT 

func LT(left interface{}, right interface{}) IExpression

func LTE 

func LTE(left interface{}, right interface{}) IExpression

func MAX 

func MAX(arg interface{}) IExpression

func MIN 

func MIN(arg interface{}) IExpression

func MUL 

func MUL(left interface{}, right interface{}) IExpression

func NEQ 

func NEQ(left interface{}, right interface{}) IExpression

func NOT_LIKE 

func NOT_LIKE(left interface{}, right interface{}) IExpression

func OR 

func OR(left interface{}, right interface{}) IExpression

func RANDTABLE 

func RANDTABLE(args ...interface{}) IExpression

func RANGETABLE 

func RANGETABLE(args ...interface{}) IExpression

func SUB 

func SUB(left interface{}, right interface{}) IExpression

func SUM 

func SUM(arg interface{}) IExpression

func VAR 

func VAR(v string) IExpression

func ZIP 

func ZIP(args ...interface{}) IExpression

type IParams 

type IParams interface {
	Get(name string) (datavalues.IDataValue, bool)
}

type ISingleArgumentValidator 

type ISingleArgumentValidator interface {
	docs.Documented
	Validate(arg datavalues.IDataValue) error
}

type IValidator 

type IValidator interface {
	docs.Documented
	Validate(args ...datavalues.IDataValue) error
}

type Map 

type Map map[string]datavalues.IDataValue

func (Map) Get 

func (p Map) Get(name string) (datavalues.IDataValue, bool)

type ScalarExpression 

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

func (*ScalarExpression) Document 

func (e *ScalarExpression) Document() docs.Documentation

func (*ScalarExpression) Eval 

func (e *ScalarExpression) Eval() error

func (*ScalarExpression) Merge 

func (e *ScalarExpression) Merge(arg IExpression) (datavalues.IDataValue, error)

func (*ScalarExpression) Result 

func (e *ScalarExpression) Result() datavalues.IDataValue

func (*ScalarExpression) String 

func (e *ScalarExpression) String() string

func (*ScalarExpression) Update 

func (e *ScalarExpression) Update(params IParams) (datavalues.IDataValue, error)

func (*ScalarExpression) Walk 

func (e *ScalarExpression) Walk(visit Visit) error

type VariableExpression 

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

func NewVariableExpression 

func NewVariableExpression(v string) *VariableExpression

func (*VariableExpression) Document 

func (e *VariableExpression) Document() docs.Documentation

func (*VariableExpression) Eval 

func (e *VariableExpression) Eval() error

func (*VariableExpression) Merge 

func (e *VariableExpression) Merge(arg IExpression) (datavalues.IDataValue, error)

func (*VariableExpression) Result 

func (e *VariableExpression) Result() datavalues.IDataValue

func (*VariableExpression) String 

func (e *VariableExpression) String() string

func (*VariableExpression) Update 

func (e *VariableExpression) Update(params IParams) (datavalues.IDataValue, error)

func (*VariableExpression) Walk 

func (e *VariableExpression) Walk(visit Visit) error

type Visit 

type Visit func(e IExpression) (isContinue bool, err error)

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