expr

package
v0.0.2 Latest Latest
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 Go to latest Published: May 3, 2021 License: MIT Imports: 19 Imported by: 165

Documentation

Overview

Expression structures, ie the `a = b` type expression syntax including parser, node types, boolean logic check, functions. 

Package expr is a generated protocol buffer package.

It is generated from these files:
	node.proto

It has these top-level messages:
	ExprPb
	NodePb
	BinaryNodePb
	BooleanNodePb
	IncludeNodePb
	UnaryNodePb
	FuncNodePb
	TriNodePb
	ArrayNodePb
	StringNodePb
	IdentityNodePb
	NumberNodePb
	ValueNodePb
	NullNodePb

Index

Constants

This section is empty.

Variables

View Source 
var (
	// ErrNotSupported indicates an error of a piece of expression syntax not
	// being supported.
	ErrNotSupported = fmt.Errorf("Not supported")
	// ErrNotImplemented an error of expression/statement syntax not being supported
	ErrNotImplemented = fmt.Errorf("Not implemented")
	// ErrUnknownCommand Unknown Command
	ErrUnknownCommand = fmt.Errorf("Unknown Command")
	// ErrInternalError Internal Error
	ErrInternalError = fmt.Errorf("Internal Error")

	// ErrNoIncluder is message saying a FilterQL included reference
	// to an include when no Includer was available to resolve
	ErrNoIncluder = fmt.Errorf("No Includer is available")
	// ErrIncludeNotFound Include Not Found
	ErrIncludeNotFound = fmt.Errorf("Include Not Found")
)
View Source 
var (
	ErrInvalidLengthNode = fmt.Errorf("proto: negative length found during unmarshaling")
	ErrIntOverflowNode   = fmt.Errorf("proto: integer overflow")
)
View Source 
var DefaultDialect *lex.Dialect = lex.LogicalExpressionDialect

We have a default Dialect, which is the "Language" or rule-set of ql

View Source 
var (
	// If we hit max depth
	ErrMaxDepth = fmt.Errorf("Recursive Evaluation Error")
)
View Source 
var (
	Trace bool
)

Functions

func EmptyEvalFunc 

func EmptyEvalFunc(ctx EvalContext, args []value.Value) (value.Value, bool)

EmptyEvalFunc a no-op evaluation function for use in

func FilterSpecialIdentities 

func FilterSpecialIdentities(l []string) []string

FilterSpecialIdentities given a list of identities, filter out special identities such as "null", "*", "match_all"

func FindAllIdentityField 

func FindAllIdentityField(node Node) []string

FindAllIdentityField Recursively descend down a node looking for all Identity Fields 

min(year)                 == {year}
eq(min(user.name), max(month)) == {user.name, month}

func FindAllLeftIdentityFields 

func FindAllLeftIdentityFields(node Node) []string

FindAllLeftIdentityFields Recursively descend down a node looking for all LEFT Identity Fields 

min(year)                 == {year}
eq(min(user.name), max(month)) == {user, month}

func FindFirstIdentity 

func FindFirstIdentity(node Node) string

FindFirstIdentity Recursively descend down a node looking for first Identity Field 

min(year)                 == year
eq(min(item), max(month)) == item
eq(min(user.last_name), max(month)) == user.last_name

func FindIdentityName 

func FindIdentityName(depth int, node Node, prefix string) string

FindIdentityName Recursively walk a node looking for first Identity Field and combine with outermost expression to create an alias 

min(year)                 => "min_year"
eq(min(year), max(month)) =>  "eq_year
EXISTS url                =>  "exists_url"

func FindIncludes 

func FindIncludes(node Node) []string

FindIncludes recursively descend down a node looking for all Include identities

func FuncAdd 

func FuncAdd(name string, fn CustomFunc)

FuncAdd Global add Functions to the VM func registry occurs here.

func IdentityMaybeEscapeBuf 

func IdentityMaybeEscapeBuf(buf *bytes.Buffer, quote byte, ident string)

IdentityMaybeEscape Quote an identity/literal if need be (has illegal characters or spaces)

func IdentityMaybeQuote 

func IdentityMaybeQuote(quote byte, ident string) string

IdentityMaybeQuote

func IdentityMaybeQuoteStrict 

func IdentityMaybeQuoteStrict(quote byte, ident string) string

IdentityMaybeQuoteStrict Quote an identity if need be (has illegal characters or spaces) First character MUST be alpha (not numeric or any other character)

func IdentityMaybeQuoteStrictBuf 

func IdentityMaybeQuoteStrictBuf(buf *bytes.Buffer, quote byte, ident string)

IdentityMaybeQuoteStrict Quote an identity if need be (has illegal characters or spaces) 

First character MUST be alpha (not numeric or any other character)

func IdentityTrim 

func IdentityTrim(ident string) string

IdentityTrim trims the leading/trailing identity quote marks ` or []

func IsValidIdentity 

func IsValidIdentity(identity string) bool

IsValidIdentity test the given string to determine if any characters are not valid and therefore must be quoted

func LeftRight 

func LeftRight(val string) (string, string, bool)

LeftRight Return left, right values if is of form `table.column` or `schema`.`table` also return true/false for if it even has left/right

func LiteralQuoteEscape 

func LiteralQuoteEscape(quote rune, literal string) string

LiteralQuoteEscape escape string that may need characters escaped 

LiteralQuoteEscape("'","item's") => 'item''s'
LiteralQuoteEscape(`"`,"item's") => "item's"
LiteralQuoteEscape(`"`,`item"s`) => "item""s"

func LiteralQuoteEscapeBuf 

func LiteralQuoteEscapeBuf(buf *bytes.Buffer, quote rune, literal string)

LiteralQuoteEscapeBuf escape string that may need characters escaped 

LiteralQuoteEscapeBuf("'","item's") => 'item''s'
LiteralQuoteEscapeBuf(`"`,"item's") => "item's"
LiteralQuoteEscapeBuf(`"`,`item"s`) => "item""s"

func NodesEqual 

func NodesEqual(n1, n2 Node) bool

func StringEscape 

func StringEscape(quote rune, literal string) string

StringEscape escape string that may need characters escaped 

StringEscape("'","item's") => "item''s"

func StringUnEscape 

func StringUnEscape(quote rune, val string) (string, bool)

StringUnEscape remove escaping on string that may need characters escaped 

StringUnEscape(`"`,`item"s`) => "item""s", true

func ValueArray 

func ValueArray(depth int, pg TokenPager) (value.Value, error)

ValueArray 

IN ("a","b","c")
["a","b","c"]

func ValueTypeFromNode 

func ValueTypeFromNode(n Node) value.ValueType

ValueTypeFromNode Infer Value type from Node

Types

type AggFunc 

type AggFunc interface {
	IsAgg() bool
}

AggFunc allows custom functions to specify if they provide aggregation

type ArrayNode 

type ArrayNode struct {
	Args []Node
	// contains filtered or unexported fields
}

ArrayNode for holding multiple similar elements 

arg0 IN (arg1,arg2.....)
5 in (1,2,3,4)

func NewArrayNode 

func NewArrayNode() *ArrayNode

NewArrayNode Create an array of Nodes which is a valid node type for boolean IN operator

func NewArrayNodeArgs 

func NewArrayNodeArgs(args []Node) *ArrayNode

func (*ArrayNode) Append 

func (m *ArrayNode) Append(n Node)

func (*ArrayNode) ChildrenArgs 

func (m *ArrayNode) ChildrenArgs() []Node

func (*ArrayNode) Equal 

func (m *ArrayNode) Equal(n Node) bool

func (*ArrayNode) Expr 

func (m *ArrayNode) Expr() *Expr

func (*ArrayNode) FromExpr 

func (m *ArrayNode) FromExpr(e *Expr) error

func (*ArrayNode) FromPB 

func (m *ArrayNode) FromPB(n *NodePb) Node

func (*ArrayNode) NodePb 

func (m *ArrayNode) NodePb() *NodePb

func (*ArrayNode) NodeType 

func (m *ArrayNode) NodeType() string

func (*ArrayNode) String 

func (m *ArrayNode) String() string

func (*ArrayNode) Validate 

func (m *ArrayNode) Validate() error

func (*ArrayNode) WriteDialect 

func (m *ArrayNode) WriteDialect(w DialectWriter)

type ArrayNodePb 

type ArrayNodePb struct {
	Wrap             *int32   `protobuf:"varint,1,req,name=wrap" json:"wrap,omitempty"`
	Args             []NodePb `protobuf:"bytes,3,rep,name=args" json:"args"`
	XXX_unrecognized []byte   `json:"-"`
}

Array Node

func (*ArrayNodePb) Descriptor 

func (*ArrayNodePb) Descriptor() ([]byte, []int)

func (*ArrayNodePb) Marshal 

func (m *ArrayNodePb) Marshal() (data []byte, err error)

func (*ArrayNodePb) MarshalTo 

func (m *ArrayNodePb) MarshalTo(data []byte) (int, error)

func (*ArrayNodePb) ProtoMessage 

func (*ArrayNodePb) ProtoMessage()

func (*ArrayNodePb) Reset 

func (m *ArrayNodePb) Reset()

func (*ArrayNodePb) Size 

func (m *ArrayNodePb) Size() (n int)

func (*ArrayNodePb) String 

func (m *ArrayNodePb) String() string

func (*ArrayNodePb) Unmarshal 

func (m *ArrayNodePb) Unmarshal(data []byte) error

type BinaryNode 

type BinaryNode struct {
	Paren    bool
	Args     []Node
	Operator lex.Token
	// contains filtered or unexported fields
}

BinaryNode is x op y, two nodes (left, right) and an operator operators can be a variety of: 

+, -, *, %, /, LIKE, CONTAINS, INTERSECTS

Also, parenthesis may wrap these

func NewBinaryNode 

func NewBinaryNode(operator lex.Token, lhArg, rhArg Node) *BinaryNode

Create a Binary node 

 @operator = * + - %/ / && || = ==
 @operator =  and, or, "is not"
@lhArg, rhArg the left, right side of binary

func (*BinaryNode) ChildrenArgs 

func (m *BinaryNode) ChildrenArgs() []Node

func (*BinaryNode) Equal 

func (m *BinaryNode) Equal(n Node) bool

func (*BinaryNode) Expr 

func (m *BinaryNode) Expr() *Expr

func (*BinaryNode) FromExpr 

func (m *BinaryNode) FromExpr(e *Expr) error

func (*BinaryNode) FromPB 

func (m *BinaryNode) FromPB(n *NodePb) Node

func (*BinaryNode) NodePb 

func (m *BinaryNode) NodePb() *NodePb

func (*BinaryNode) NodeType 

func (m *BinaryNode) NodeType() string

func (*BinaryNode) String 

func (m *BinaryNode) String() string

func (*BinaryNode) Validate 

func (m *BinaryNode) Validate() error

Negation I wanted to do negation on Binaries, but ended up not doing for now

ie, rewrite NOT (X == "y") => X != "y"

The general problem we ran into is that we lose some fidelity in collapsing AST that is necessary for other evaluation run-times.

logically `NOT (X > y)` is NOT THE SAME AS `(X <= y) due to lack of existence of X 

func (m *BinaryNode) ReverseNegation() bool {
	switch m.Operator.T {
	case lex.TokenEqualEqual:
		m.Operator.T = lex.TokenNE
		m.Operator.V = m.Operator.T.String()
	case lex.TokenNE:
		m.Operator.T = lex.TokenEqualEqual
		m.Operator.V = m.Operator.T.String()
	case lex.TokenLT:
		m.Operator.T = lex.TokenGE
		m.Operator.V = m.Operator.T.String()
	case lex.TokenLE:
		m.Operator.T = lex.TokenGT
		m.Operator.V = m.Operator.T.String()
	case lex.TokenGT:
		m.Operator.T = lex.TokenLE
		m.Operator.V = m.Operator.T.String()
	case lex.TokenGE:
		m.Operator.T = lex.TokenLT
		m.Operator.V = m.Operator.T.String()
	default:
		//u.Warnf("What, what is this?   %s", m)
		m.negated = !m.negated
		return true
	}
	return true
}

func (m *BinaryNode) Collapse() Node { return m } func (m *BinaryNode) Negated() bool { return m.negated } 

func (m *BinaryNode) StringNegate() string {
	w := NewDefaultWriter()
	m.WriteNegate(w)
	return w.String()
}

func (m *BinaryNode) WriteNegate(w DialectWriter) {
	switch m.Operator.T {
	case lex.TokenIN, lex.TokenIntersects, lex.TokenLike, lex.TokenContains:
		m.writeToString(w, "NOT ")
	default:
		m.writeToString(w, "")
	}
}

func (*BinaryNode) WriteDialect 

func (m *BinaryNode) WriteDialect(w DialectWriter)

type BinaryNodePb 

type BinaryNodePb struct {
	Op               int32    `protobuf:"varint,1,req,name=op" json:"op"`
	Paren            bool     `protobuf:"varint,2,opt,name=paren" json:"paren"`
	Args             []NodePb `protobuf:"bytes,3,rep,name=args" json:"args"`
	XXX_unrecognized []byte   `json:"-"`
}

Binary Node, two child args

func (*BinaryNodePb) Descriptor 

func (*BinaryNodePb) Descriptor() ([]byte, []int)

func (*BinaryNodePb) Marshal 

func (m *BinaryNodePb) Marshal() (data []byte, err error)

func (*BinaryNodePb) MarshalTo 

func (m *BinaryNodePb) MarshalTo(data []byte) (int, error)

func (*BinaryNodePb) ProtoMessage 

func (*BinaryNodePb) ProtoMessage()

func (*BinaryNodePb) Reset 

func (m *BinaryNodePb) Reset()

func (*BinaryNodePb) Size 

func (m *BinaryNodePb) Size() (n int)

func (*BinaryNodePb) String 

func (m *BinaryNodePb) String() string

func (*BinaryNodePb) Unmarshal 

func (m *BinaryNodePb) Unmarshal(data []byte) error

type BooleanNode 

type BooleanNode struct {
	Args     []Node
	Operator lex.Token
	// contains filtered or unexported fields
}

BooleanNode is n nodes and an operator operators can be only AND/OR

func NewBooleanNode 

func NewBooleanNode(operator lex.Token, args ...Node) *BooleanNode

NewBooleanNode Create a boolean node 

 @operator = AND, OR
@args = nodes

func (*BooleanNode) ChildrenArgs 

func (m *BooleanNode) ChildrenArgs() []Node

func (*BooleanNode) Collapse 

func (m *BooleanNode) Collapse() Node

func (*BooleanNode) Equal 

func (m *BooleanNode) Equal(n Node) bool

func (*BooleanNode) Expr 

func (m *BooleanNode) Expr() *Expr

func (*BooleanNode) FromExpr 

func (m *BooleanNode) FromExpr(e *Expr) error

func (*BooleanNode) FromPB 

func (m *BooleanNode) FromPB(n *NodePb) Node

func (*BooleanNode) Negated 

func (m *BooleanNode) Negated() bool

func (*BooleanNode) NodePb 

func (m *BooleanNode) NodePb() *NodePb

func (*BooleanNode) NodeType 

func (m *BooleanNode) NodeType() string

func (*BooleanNode) ReverseNegation 

func (m *BooleanNode) ReverseNegation() bool

func (*BooleanNode) String 

func (m *BooleanNode) String() string

func (*BooleanNode) StringNegate 

func (m *BooleanNode) StringNegate() string

func (*BooleanNode) Validate 

func (m *BooleanNode) Validate() error

func (*BooleanNode) WriteDialect 

func (m *BooleanNode) WriteDialect(w DialectWriter)

func (*BooleanNode) WriteNegate 

func (m *BooleanNode) WriteNegate(w DialectWriter)

type BooleanNodePb 

type BooleanNodePb struct {
	Op               int32    `protobuf:"varint,1,req,name=op" json:"op"`
	Args             []NodePb `protobuf:"bytes,2,rep,name=args" json:"args"`
	XXX_unrecognized []byte   `json:"-"`
}

Boolean Node, n child args

func (*BooleanNodePb) Descriptor 

func (*BooleanNodePb) Descriptor() ([]byte, []int)

func (*BooleanNodePb) Marshal 

func (m *BooleanNodePb) Marshal() (data []byte, err error)

func (*BooleanNodePb) MarshalTo 

func (m *BooleanNodePb) MarshalTo(data []byte) (int, error)

func (*BooleanNodePb) ProtoMessage 

func (*BooleanNodePb) ProtoMessage()

func (*BooleanNodePb) Reset 

func (m *BooleanNodePb) Reset()

func (*BooleanNodePb) Size 

func (m *BooleanNodePb) Size() (n int)

func (*BooleanNodePb) String 

func (m *BooleanNodePb) String() string

func (*BooleanNodePb) Unmarshal 

func (m *BooleanNodePb) Unmarshal(data []byte) error

type ContextReadWriter 

type ContextReadWriter interface {
	ContextReader
	ContextWriter
}

ContextReadWriter represents a Context which can be Read & Written.

type ContextReader 

type ContextReader interface {
	Get(key string) (value.Value, bool)
	Row() map[string]value.Value
	Ts() time.Time
}

ContextReader is a key-value interface to read the context of message/row using a Get("key") interface. Used by vm to evaluate messages

type ContextWriter 

type ContextWriter interface {
	Put(col SchemaInfo, readCtx ContextReader, v value.Value) error
	Delete(row map[string]value.Value) error
}

ContextWriter For evaluation storage vm writes results to this after evaluation

type CustomFunc 

type CustomFunc interface {
	// Type Define the Return Type of this function, or use value.Value for unknown.
	Type() value.ValueType
	// Validate is parse time syntax and type evaluation.  Also returns the evaluation
	// function.
	Validate(n *FuncNode) (EvaluatorFunc, error)
}

CustomFunc allows custom functions to be added for run-time evaluation

type DialectWriter 

type DialectWriter interface {
	io.Writer
	Len() int
	WriteLiteral(string)
	WriteIdentity(string)
	WriteLeftRightIdentity(string, string)
	WriteIdentityQuote(string, byte)
	WriteNumber(string)
	WriteNull()
	WriteValue(v value.Value)
	String() string
}

DialectWriter Defines interface to allow different dialects to have different escape characters. IE, given an AST structure allow the writer to control the string output. Allows translation between different dialects (different escapes) as well as allows normalization indentation, tabs, spacing, etc. - postgres: literal-escape = ' identity = " - mysql: literal-escape = " identity = ` - cql: literal-escape = ' identity = ` - bigquery: literal-escape = " identity = []

func NewDefaultNoNamspaceWriter 

func NewDefaultNoNamspaceWriter() DialectWriter

NewDefaultNoNamspaceWriter uses mysql escaping rules literals=" identity=` Strip namespaces so that 'users.first_name` becomes `first_name` (strip users.)

func NewDefaultWriter 

func NewDefaultWriter() DialectWriter

NewDefaultWriter uses mysql escaping rules literals=" identity=`

func NewDialectWriter 

func NewDialectWriter(l, i byte) DialectWriter

NewDialectWriter creates a writer that is custom literal and identity escape characters

func NewFingerPrintWriter 

func NewFingerPrintWriter(replace string, w DialectWriter) DialectWriter

func NewFingerPrinter 

func NewFingerPrinter() DialectWriter

func NewJSONDialectWriter 

func NewJSONDialectWriter() DialectWriter

NewJSONDialectWriter escape literal " with \"

func NewKeywordDialect 

func NewKeywordDialect(kw []string) DialectWriter

type EvalContext 

type EvalContext interface {
	ContextReader
}

EvalContext used to contain info for usage/lookup at runtime evaluation

type EvalIncludeContext 

type EvalIncludeContext interface {
	ContextReader
	Includer
}

EvalIncludeContext context, used to contain info for usage/lookup at runtime evaluation

type EvaluatorFunc 

type EvaluatorFunc func(ctx EvalContext, args []value.Value) (value.Value, bool)

EvaluatorFunc defines the evaluator func which may be stateful (or not) for evaluating custom functions

type Expr 

type Expr struct {
	// The `Op` (aka token), and Args expressions are non
	// nil if it is an expression
	Op   string  `json:"op,omitempty"`
	Args []*Expr `json:"args,omitempty"`

	// If op is 0, and args nil then exactly one of these should be set
	Identity string `json:"ident,omitempty"`
	Value    string `json:"val,omitempty"`
}

Expr represents single part of an Expression, it is a generic AST structure that can be built in tree structure and JSON serialized to represent full AST as json.

func ExprsFromNodes 

func ExprsFromNodes(nodes []Node) []*Expr

type ExprPb 

type ExprPb struct {
	Op               *int32    `protobuf:"varint,1,opt,name=op" json:"op,omitempty"`
	Args             []*ExprPb `protobuf:"bytes,2,rep,name=args" json:"args,omitempty"`
	Ident            *string   `protobuf:"bytes,4,opt,name=ident" json:"ident,omitempty"`
	Val              *string   `protobuf:"bytes,5,opt,name=val" json:"val,omitempty"`
	Ival             *int64    `protobuf:"varint,6,opt,name=ival" json:"ival,omitempty"`
	Bval             *bool     `protobuf:"varint,7,opt,name=bval" json:"bval,omitempty"`
	Fval             *float64  `protobuf:"fixed64,8,opt,name=fval" json:"fval,omitempty"`
	XXX_unrecognized []byte    `json:"-"`
}

The generic Expr

func (*ExprPb) Descriptor 

func (*ExprPb) Descriptor() ([]byte, []int)

func (*ExprPb) Marshal 

func (m *ExprPb) Marshal() (data []byte, err error)

func (*ExprPb) MarshalTo 

func (m *ExprPb) MarshalTo(data []byte) (int, error)

func (*ExprPb) ProtoMessage 

func (*ExprPb) ProtoMessage()

func (*ExprPb) Reset 

func (m *ExprPb) Reset()

func (*ExprPb) Size 

func (m *ExprPb) Size() (n int)

func (*ExprPb) String 

func (m *ExprPb) String() string

func (*ExprPb) Unmarshal 

func (m *ExprPb) Unmarshal(data []byte) error

type Func 

type Func struct {
	Name       string        // name of func, lower-cased
	Aggregate  bool          // is this aggregate func?
	CustomFunc               // CustomFunc Is dynamic function that can be registered
	Eval       EvaluatorFunc // The memoized evaluation function
}

Func Describes a function expression which wraps and allows native go functions to be called in expression vm

type FuncNode 

type FuncNode struct {
	Name    string        // Name of func
	F       Func          // The actual function that this AST maps to
	Eval    EvaluatorFunc // the evaluator function
	Missing bool
	Args    []Node // Arguments are them-selves nodes
}

FuncNode holds a Func, which desribes a go Function as well as fulfilling the Pos, String() etc for a Node

func NewFuncNode 

func NewFuncNode(name string, f Func) *FuncNode

NewFuncNode create new Function Expression Node.

func (*FuncNode) ChildrenArgs 

func (m *FuncNode) ChildrenArgs() []Node

func (*FuncNode) Equal 

func (m *FuncNode) Equal(n Node) bool

func (*FuncNode) Expr 

func (m *FuncNode) Expr() *Expr

Expr convert the FuncNode to Expr

func (*FuncNode) FromExpr 

func (m *FuncNode) FromExpr(e *Expr) error

func (*FuncNode) FromPB 

func (m *FuncNode) FromPB(n *NodePb) Node

func (*FuncNode) NodePb 

func (m *FuncNode) NodePb() *NodePb

func (*FuncNode) NodeType 

func (m *FuncNode) NodeType() string

func (*FuncNode) String 

func (m *FuncNode) String() string

func (*FuncNode) Validate 

func (m *FuncNode) Validate() error

func (*FuncNode) WriteDialect 

func (m *FuncNode) WriteDialect(w DialectWriter)

type FuncNodePb 

type FuncNodePb struct {
	Name             string   `protobuf:"bytes,1,req,name=name" json:"name"`
	Args             []NodePb `protobuf:"bytes,2,rep,name=args" json:"args"`
	XXX_unrecognized []byte   `json:"-"`
}

Func Node, args are children

func (*FuncNodePb) Descriptor 

func (*FuncNodePb) Descriptor() ([]byte, []int)

func (*FuncNodePb) Marshal 

func (m *FuncNodePb) Marshal() (data []byte, err error)

func (*FuncNodePb) MarshalTo 

func (m *FuncNodePb) MarshalTo(data []byte) (int, error)

func (*FuncNodePb) ProtoMessage 

func (*FuncNodePb) ProtoMessage()

func (*FuncNodePb) Reset 

func (m *FuncNodePb) Reset()

func (*FuncNodePb) Size 

func (m *FuncNodePb) Size() (n int)

func (*FuncNodePb) String 

func (m *FuncNodePb) String() string

func (*FuncNodePb) Unmarshal 

func (m *FuncNodePb) Unmarshal(data []byte) error

type FuncRegistry 

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

FuncRegistry contains lists of functions for different scope/run-time evaluation contexts.

func NewFuncRegistry 

func NewFuncRegistry() *FuncRegistry

NewFuncRegistry create a new function registry. By default their is a global one, but you can have local function registries as well.

func (*FuncRegistry) Add 

func (m *FuncRegistry) Add(name string, fn CustomFunc)

Add a name/function to registry

func (*FuncRegistry) FuncGet 

func (m *FuncRegistry) FuncGet(name string) (Func, bool)

FuncGet gets a function from registry if it exists.

type FuncResolver 

type FuncResolver interface {
	FuncGet(name string) (Func, bool)
}

FuncResolver is a function resolution interface that allows local/namespaced function resolution.

type IdentityNode 

type IdentityNode struct {
	Quote byte
	Text  string
	// contains filtered or unexported fields
}

IdentityNode will look up a value out of a env bag also identities of sql objects (tables, columns, etc) we often need to rewrite these as in sql it is `table.column`

func NewIdentityNode 

func NewIdentityNode(tok *lex.Token) *IdentityNode

func NewIdentityNodeVal 

func NewIdentityNodeVal(val string) *IdentityNode

func (*IdentityNode) Bool 

func (m *IdentityNode) Bool() bool

func (*IdentityNode) Equal 

func (m *IdentityNode) Equal(n Node) bool

func (*IdentityNode) Expr 

func (m *IdentityNode) Expr() *Expr

func (*IdentityNode) FromExpr 

func (m *IdentityNode) FromExpr(e *Expr) error

func (*IdentityNode) FromPB 

func (m *IdentityNode) FromPB(n *NodePb) Node

func (*IdentityNode) HasLeftRight 

func (m *IdentityNode) HasLeftRight() bool

HasLeftRight Return bool if is of form `table.column` or `schema`.`table`

func (*IdentityNode) IdentityPb 

func (m *IdentityNode) IdentityPb() *IdentityNodePb

func (*IdentityNode) IsBooleanIdentity 

func (m *IdentityNode) IsBooleanIdentity() bool

func (*IdentityNode) LeftRight 

func (m *IdentityNode) LeftRight() (string, string, bool)

Return left, right values if is of form `table.column` or `schema`.`table` and also return true/false for if it even has left & right syntax

func (*IdentityNode) NodePb 

func (m *IdentityNode) NodePb() *NodePb

func (*IdentityNode) NodeType 

func (m *IdentityNode) NodeType() string

func (*IdentityNode) OriginalText 

func (m *IdentityNode) OriginalText() string

func (*IdentityNode) String 

func (m *IdentityNode) String() string

func (*IdentityNode) Validate 

func (m *IdentityNode) Validate() error

func (*IdentityNode) WriteDialect 

func (m *IdentityNode) WriteDialect(w DialectWriter)

type IdentityNodePb 

type IdentityNodePb struct {
	Quote            *int32 `protobuf:"varint,1,opt,name=quote" json:"quote,omitempty"`
	Text             string `protobuf:"bytes,3,opt,name=text" json:"text"`
	XXX_unrecognized []byte `json:"-"`
}

Identity

func (*IdentityNodePb) Descriptor 

func (*IdentityNodePb) Descriptor() ([]byte, []int)

func (*IdentityNodePb) Marshal 

func (m *IdentityNodePb) Marshal() (data []byte, err error)

func (*IdentityNodePb) MarshalTo 

func (m *IdentityNodePb) MarshalTo(data []byte) (int, error)

func (*IdentityNodePb) ProtoMessage 

func (*IdentityNodePb) ProtoMessage()

func (*IdentityNodePb) Reset 

func (m *IdentityNodePb) Reset()

func (*IdentityNodePb) Size 

func (m *IdentityNodePb) Size() (n int)

func (*IdentityNodePb) String 

func (m *IdentityNodePb) String() string

func (*IdentityNodePb) Unmarshal 

func (m *IdentityNodePb) Unmarshal(data []byte) error

type IdentityNodes 

type IdentityNodes []*IdentityNode

IdentityNodes is a list of identities

func FindAllIdentities 

func FindAllIdentities(node Node) IdentityNodes

FindAllIdentities gets all identity

func (IdentityNodes) LeftStrings 

func (m IdentityNodes) LeftStrings() []string

LeftStrings get all Left Identity fields.

func (IdentityNodes) Strings 

func (m IdentityNodes) Strings() []string

Strings get all identity strings

type IncludeContext 

type IncludeContext struct {
	ContextReader
}

IncludeContext A ContextReader that implements Include interface.

func NewIncludeContext 

func NewIncludeContext(cr ContextReader) *IncludeContext

NewIncludeContext a new IncludeContext from contextreader.

func (*IncludeContext) Include 

func (*IncludeContext) Include(name string) (Node, error)

Include interface not implemented.

type IncludeNode 

type IncludeNode struct {
	ExprNode Node // The expression of the referred to include
	Identity *IdentityNode
	Operator lex.Token
	// contains filtered or unexported fields
}

IncludeNode references a named node 

(  ! INCLUDE <identity>  |  INCLUDE <identity> | NOT INCLUDE <identity> )

func NewInclude 

func NewInclude(operator lex.Token, id *IdentityNode) *IncludeNode

Include nodes 

NOT INCLUDE <identity>
! INCLUDE <identity>
INCLUDE <identity>

func (*IncludeNode) Collapse 

func (m *IncludeNode) Collapse() Node

func (*IncludeNode) Equal 

func (m *IncludeNode) Equal(n Node) bool

func (*IncludeNode) Expr 

func (m *IncludeNode) Expr() *Expr

func (*IncludeNode) FromExpr 

func (m *IncludeNode) FromExpr(e *Expr) error

func (*IncludeNode) FromPB 

func (m *IncludeNode) FromPB(n *NodePb) Node

func (*IncludeNode) Negated 

func (m *IncludeNode) Negated() bool

func (*IncludeNode) NodePb 

func (m *IncludeNode) NodePb() *NodePb

func (*IncludeNode) NodeType 

func (m *IncludeNode) NodeType() string

func (*IncludeNode) ReverseNegation 

func (m *IncludeNode) ReverseNegation() bool

func (*IncludeNode) String 

func (m *IncludeNode) String() string

func (*IncludeNode) StringNegate 

func (m *IncludeNode) StringNegate() string

func (*IncludeNode) Validate 

func (m *IncludeNode) Validate() error

func (*IncludeNode) WriteDialect 

func (m *IncludeNode) WriteDialect(w DialectWriter)

func (*IncludeNode) WriteNegate 

func (m *IncludeNode) WriteNegate(w DialectWriter)

type IncludeNodePb 

type IncludeNodePb struct {
	Op               int32          `protobuf:"varint,1,req,name=op" json:"op"`
	Negated          bool           `protobuf:"varint,2,req,name=negated" json:"negated"`
	Identity         IdentityNodePb `protobuf:"bytes,3,req,name=identity" json:"identity"`
	XXX_unrecognized []byte         `json:"-"`
}

Include Node, two child args

func (*IncludeNodePb) Descriptor 

func (*IncludeNodePb) Descriptor() ([]byte, []int)

func (*IncludeNodePb) Marshal 

func (m *IncludeNodePb) Marshal() (data []byte, err error)

func (*IncludeNodePb) MarshalTo 

func (m *IncludeNodePb) MarshalTo(data []byte) (int, error)

func (*IncludeNodePb) ProtoMessage 

func (*IncludeNodePb) ProtoMessage()

func (*IncludeNodePb) Reset 

func (m *IncludeNodePb) Reset()

func (*IncludeNodePb) Size 

func (m *IncludeNodePb) Size() (n int)

func (*IncludeNodePb) String 

func (m *IncludeNodePb) String() string

func (*IncludeNodePb) Unmarshal 

func (m *IncludeNodePb) Unmarshal(data []byte) error

type Includer 

type Includer interface {
	Include(name string) (Node, error)
}

Includer defines an interface used for resolving INCLUDE clauses into a Indclude reference. Implementations should return an error if the name cannot be resolved.

type LexTokenPager 

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

TokenPager is responsible for determining end of current tree (column, etc)

func NewLexTokenPager 

func NewLexTokenPager(lex *lex.Lexer) *LexTokenPager

func (*LexTokenPager) Backup 

func (m *LexTokenPager) Backup()

backup backs the input stream up one token.

func (*LexTokenPager) ClauseEnd 

func (m *LexTokenPager) ClauseEnd() bool

ClauseEnd are we at end of clause

func (*LexTokenPager) Cur 

func (m *LexTokenPager) Cur() lex.Token

Returns the current token, does not advance

func (*LexTokenPager) ErrMsg 

func (m *LexTokenPager) ErrMsg(msg string) error

func (*LexTokenPager) IsEnd 

func (m *LexTokenPager) IsEnd() bool

IsEnd determines if pager is at end of statement

func (*LexTokenPager) Lexer 

func (m *LexTokenPager) Lexer() *lex.Lexer

Lexer get the underlying lexer

func (*LexTokenPager) Next 

func (m *LexTokenPager) Next() lex.Token

Next returns the current token and advances cursor to next one

func (*LexTokenPager) Peek 

func (m *LexTokenPager) Peek() lex.Token

Peek returns but does not consume the next token.

type NegateableNode 

type NegateableNode interface {
	// Node the negateable nodes also implement the entire Node
	Node
	// Negated Say if this node is negateable (it may not be), If the node
	// is negateable, we may collapse an surrounding negation into here
	Negated() bool
	// ReverseNegation if Possible:  for instance:
	//   "A" NOT IN ("a","b")    =>  "A" IN ("a","b")
	ReverseNegation() bool
	// StringNegate
	StringNegate() string
	// WriteNegate write out this node into a writer
	WriteNegate(w DialectWriter)
	// Collapse Negateable nodes may be collapsed logically into new nodes
	// return this node collapsed down to simpliest form
	Collapse() Node
}

NegateableNode A negateable node requires a special type of String() function due to an enclosing urnary NOT being inserted into middle of string syntax 

<expression> [NOT] IN ("a","b")
<expression> [NOT] BETWEEN <expression> AND <expression>
<expression> [NOT] LIKE <expression>
<expression> [NOT] CONTAINS <expression>
<expression> [NOT] INTERSECTS ("a", "b")

type Node 

type Node interface {
	// String representation of Node parseable back to itself
	String() string

	// WriteDialect Given a dialect writer write out, equivalent of String()
	// but allows different escape characters
	WriteDialect(w DialectWriter)

	// Validate Syntax validation of this expression node
	Validate() error

	// NodePb Convert this node to a Protobuf copy of it
	NodePb() *NodePb
	// FromPB Convert a protobuf presentation of node to Node.
	FromPB(*NodePb) Node

	// Expr Convert node into a simple expression syntax
	// which can be used for json respresentation
	Expr() *Expr
	// FromExpr
	FromExpr(*Expr) error

	// Equal compares deep equality of
	Equal(Node) bool

	// NodeType the String, Identity, etc
	NodeType() string
}

Node is a node in an expression tree, implemented by different types (binary, urnary, func, identity, etc)

qlbridge does not currently implement statements (if, for, switch, etc) just expressions, and operators

func InlineIncludes 

func InlineIncludes(ctx Includer, n Node) (Node, error)

InlineIncludes take an expression and resolve any includes so that the included expression is "Inline"

func MustParse 

func MustParse(expressionText string) Node

MustParse parse a single Expression, returning an Expression Node and panics if it cannot be parsed 

MustParse("5 * toint(item_name)")

func NewUnary 

func NewUnary(operator lex.Token, arg Node) Node

Unary nodes 

NOT <expression>
! <expression>
EXISTS <identity>
<identity> IS NOT NULL

func NodeFromExpr 

func NodeFromExpr(e *Expr) (Node, error)

func NodeFromNodePb 

func NodeFromNodePb(n *NodePb) Node

NodeFromNodePb Create a node from pb

func NodeFromPb 

func NodeFromPb(pb []byte) (Node, error)

NodeFromPb Create a node from pb

func NodesFromExprs 

func NodesFromExprs(args []*Expr) ([]Node, error)

func NodesFromNodesPb 

func NodesFromNodesPb(pb []NodePb) []Node

func NodesFromNodesPbPtr 

func NodesFromNodesPbPtr(pb []*NodePb) []Node

func ParseExprWithFuncs 

func ParseExprWithFuncs(p TokenPager, fr FuncResolver) (Node, error)

Parse a single Expression, returning an Expression Node

@fr = function registry with any additional functions 

ParseExprWithFuncs("5 * toint(item_name)", funcRegistry)

func ParseExpression 

func ParseExpression(expressionText string) (Node, error)

ParseExpression parse a single Expression, returning an Expression Node 

ParseExpression("5 * toint(item_name)")

func ParsePager 

func ParsePager(pager TokenPager) (Node, error)

Parse a single Expression, returning an Expression Node

@pager = Token Pager

type NodeArgs 

type NodeArgs interface {
	ChildrenArgs() []Node
}

NodeArgs is an interface for nodes which have child arguments

type NodePb 

type NodePb struct {
	Bn               *BinaryNodePb   `protobuf:"bytes,1,opt,name=bn" json:"bn,omitempty"`
	Booln            *BooleanNodePb  `protobuf:"bytes,2,opt,name=booln" json:"booln,omitempty"`
	Un               *UnaryNodePb    `protobuf:"bytes,3,opt,name=un" json:"un,omitempty"`
	Fn               *FuncNodePb     `protobuf:"bytes,4,opt,name=fn" json:"fn,omitempty"`
	Tn               *TriNodePb      `protobuf:"bytes,5,opt,name=tn" json:"tn,omitempty"`
	An               *ArrayNodePb    `protobuf:"bytes,6,opt,name=an" json:"an,omitempty"`
	Nn               *NumberNodePb   `protobuf:"bytes,10,opt,name=nn" json:"nn,omitempty"`
	Vn               *ValueNodePb    `protobuf:"bytes,11,opt,name=vn" json:"vn,omitempty"`
	In               *IdentityNodePb `protobuf:"bytes,12,opt,name=in" json:"in,omitempty"`
	Sn               *StringNodePb   `protobuf:"bytes,13,opt,name=sn" json:"sn,omitempty"`
	Incn             *IncludeNodePb  `protobuf:"bytes,14,opt,name=incn" json:"incn,omitempty"`
	Niln             *NullNodePb     `protobuf:"bytes,15,opt,name=niln" json:"niln,omitempty"`
	XXX_unrecognized []byte          `json:"-"`
}

The generic Node, must be exactly one of these types

func NodesPbFromNodes 

func NodesPbFromNodes(nodes []Node) []*NodePb

func (*NodePb) Descriptor 

func (*NodePb) Descriptor() ([]byte, []int)

func (*NodePb) Marshal 

func (m *NodePb) Marshal() (data []byte, err error)

func (*NodePb) MarshalTo 

func (m *NodePb) MarshalTo(data []byte) (int, error)

func (*NodePb) ProtoMessage 

func (*NodePb) ProtoMessage()

func (*NodePb) Reset 

func (m *NodePb) Reset()

func (*NodePb) Size 

func (m *NodePb) Size() (n int)

func (*NodePb) String 

func (m *NodePb) String() string

func (*NodePb) Unmarshal 

func (m *NodePb) Unmarshal(data []byte) error

type NullNode 

type NullNode struct{}

NullNode is a simple NULL type node

func NewNull 

func NewNull(operator lex.Token) *NullNode

func (*NullNode) Equal 

func (m *NullNode) Equal(n Node) bool

func (*NullNode) Expr 

func (m *NullNode) Expr() *Expr

func (*NullNode) FromExpr 

func (m *NullNode) FromExpr(e *Expr) error

func (*NullNode) FromPB 

func (m *NullNode) FromPB(n *NodePb) Node

func (*NullNode) NodePb 

func (m *NullNode) NodePb() *NodePb

func (*NullNode) NodeType 

func (m *NullNode) NodeType() string

func (*NullNode) String 

func (m *NullNode) String() string

func (*NullNode) Validate 

func (m *NullNode) Validate() error

func (*NullNode) WriteDialect 

func (m *NullNode) WriteDialect(w DialectWriter)

type NullNodePb 

type NullNodePb struct {
	Niltype          int32  `protobuf:"varint,1,opt,name=niltype" json:"niltype"`
	XXX_unrecognized []byte `json:"-"`
}

NullNode

func (*NullNodePb) Descriptor 

func (*NullNodePb) Descriptor() ([]byte, []int)

func (*NullNodePb) Marshal 

func (m *NullNodePb) Marshal() (data []byte, err error)

func (*NullNodePb) MarshalTo 

func (m *NullNodePb) MarshalTo(data []byte) (int, error)

func (*NullNodePb) ProtoMessage 

func (*NullNodePb) ProtoMessage()

func (*NullNodePb) Reset 

func (m *NullNodePb) Reset()

func (*NullNodePb) Size 

func (m *NullNodePb) Size() (n int)

func (*NullNodePb) String 

func (m *NullNodePb) String() string

func (*NullNodePb) Unmarshal 

func (m *NullNodePb) Unmarshal(data []byte) error

type NumberNode 

type NumberNode struct {
	IsInt   bool    // Number has an integer value.
	IsFloat bool    // Number has a floating-point value.
	Int64   int64   // The integer value.
	Float64 float64 // The floating-point value.
	Text    string  // The original textual representation from the input.
}

NumberNode holds a number: signed or unsigned integer or float. The value is parsed and stored under all the types that can represent the value. This simulates in a small amount of code the behavior of Go's ideal constants.

func NewNumber 

func NewNumber(fv float64) (*NumberNode, error)

func NewNumberStr 

func NewNumberStr(text string) (*NumberNode, error)

NewNumberStr is a little weird in that this Node accepts string @text and uses go to parse into Int, AND Float.

func (*NumberNode) Equal 

func (m *NumberNode) Equal(n Node) bool

func (*NumberNode) Expr 

func (m *NumberNode) Expr() *Expr

func (*NumberNode) FromExpr 

func (m *NumberNode) FromExpr(e *Expr) error

func (*NumberNode) FromPB 

func (m *NumberNode) FromPB(n *NodePb) Node

func (*NumberNode) NodePb 

func (m *NumberNode) NodePb() *NodePb

func (*NumberNode) NodeType 

func (m *NumberNode) NodeType() string

func (*NumberNode) String 

func (n *NumberNode) String() string

func (*NumberNode) Validate 

func (m *NumberNode) Validate() error

func (*NumberNode) WriteDialect 

func (m *NumberNode) WriteDialect(w DialectWriter)

type NumberNodePb 

type NumberNodePb struct {
	Isint            bool    `protobuf:"varint,1,opt,name=isint" json:"isint"`
	Isfloat          bool    `protobuf:"varint,2,opt,name=isfloat" json:"isfloat"`
	Iv               int64   `protobuf:"varint,3,req,name=iv" json:"iv"`
	Fv               float64 `protobuf:"fixed64,4,req,name=fv" json:"fv"`
	Text             string  `protobuf:"bytes,5,req,name=text" json:"text"`
	XXX_unrecognized []byte  `json:"-"`
}

Number Node

func (*NumberNodePb) Descriptor 

func (*NumberNodePb) Descriptor() ([]byte, []int)

func (*NumberNodePb) Marshal 

func (m *NumberNodePb) Marshal() (data []byte, err error)

func (*NumberNodePb) MarshalTo 

func (m *NumberNodePb) MarshalTo(data []byte) (int, error)

func (*NumberNodePb) ProtoMessage 

func (*NumberNodePb) ProtoMessage()

func (*NumberNodePb) Reset 

func (m *NumberNodePb) Reset()

func (*NumberNodePb) Size 

func (m *NumberNodePb) Size() (n int)

func (*NumberNodePb) String 

func (m *NumberNodePb) String() string

func (*NumberNodePb) Unmarshal 

func (m *NumberNodePb) Unmarshal(data []byte) error

type RowWriter 

type RowWriter interface {
	// Commit the given rowInfo to persist
	Commit(rowInfo []SchemaInfo, row RowWriter) error
	// Put (persist) given Column info write single column.
	Put(col SchemaInfo, readCtx ContextReader, v value.Value) error
}

RowWriter for committing row ops (insert, update)

type SchemaInfo 

type SchemaInfo interface {
	Key() string
}

SchemaInfo is interface for a Column type

type SchemaInfoString 

type SchemaInfoString string

SchemaInfoString implements schemaInfo Key()

func (SchemaInfoString) Key 

func (m SchemaInfoString) Key() string

type StringNode 

type StringNode struct {
	Quote byte
	Text  string
	// contains filtered or unexported fields
}

StringNode holds a value literal, quotes not included

func NewStringNeedsEscape 

func NewStringNeedsEscape(t lex.Token) *StringNode

func NewStringNoQuoteNode 

func NewStringNoQuoteNode(text string) *StringNode

func NewStringNode 

func NewStringNode(text string) *StringNode

func NewStringNodeToken 

func NewStringNodeToken(t lex.Token) *StringNode

func (*StringNode) Equal 

func (m *StringNode) Equal(n Node) bool

func (*StringNode) Expr 

func (m *StringNode) Expr() *Expr

func (*StringNode) FromExpr 

func (m *StringNode) FromExpr(e *Expr) error

func (*StringNode) FromPB 

func (m *StringNode) FromPB(n *NodePb) Node

func (*StringNode) NodePb 

func (m *StringNode) NodePb() *NodePb

func (*StringNode) NodeType 

func (m *StringNode) NodeType() string

func (*StringNode) String 

func (m *StringNode) String() string

func (*StringNode) Validate 

func (m *StringNode) Validate() error

func (*StringNode) WriteDialect 

func (m *StringNode) WriteDialect(w DialectWriter)

type StringNodePb 

type StringNodePb struct {
	Noquote          *bool  `protobuf:"varint,1,opt,name=noquote" json:"noquote,omitempty"`
	Quote            *int32 `protobuf:"varint,2,opt,name=quote" json:"quote,omitempty"`
	Text             string `protobuf:"bytes,3,opt,name=text" json:"text"`
	XXX_unrecognized []byte `json:"-"`
}

String literal, no children

func (*StringNodePb) Descriptor 

func (*StringNodePb) Descriptor() ([]byte, []int)

func (*StringNodePb) Marshal 

func (m *StringNodePb) Marshal() (data []byte, err error)

func (*StringNodePb) MarshalTo 

func (m *StringNodePb) MarshalTo(data []byte) (int, error)

func (*StringNodePb) ProtoMessage 

func (*StringNodePb) ProtoMessage()

func (*StringNodePb) Reset 

func (m *StringNodePb) Reset()

func (*StringNodePb) Size 

func (m *StringNodePb) Size() (n int)

func (*StringNodePb) String 

func (m *StringNodePb) String() string

func (*StringNodePb) Unmarshal 

func (m *StringNodePb) Unmarshal(data []byte) error

type TokenPager 

type TokenPager interface {
	Peek() lex.Token
	Next() lex.Token
	Cur() lex.Token
	Backup()
	IsEnd() bool
	ClauseEnd() bool
	Lexer() *lex.Lexer
	ErrMsg(msg string) error
}

TokenPager wraps a Lexer, and implements the Logic to determine what is the end of this particular clause. Lexer's are stateless, while tokenpager implements state ontop of pager and allows forward/back etc

type TriNode 

type TriNode struct {
	Args     []Node
	Operator lex.Token
	// contains filtered or unexported fields
}

TriNode 3 part expression such as 

ARG1 Between ARG2 AND ARG3

func NewTriNode 

func NewTriNode(operator lex.Token, arg1, arg2, arg3 Node) *TriNode

Create a Tri node 

@arg1 [NOT] BETWEEN @arg2 AND @arg3

func (*TriNode) ChildrenArgs 

func (m *TriNode) ChildrenArgs() []Node

func (*TriNode) Collapse 

func (m *TriNode) Collapse() Node

func (*TriNode) Equal 

func (m *TriNode) Equal(n Node) bool

func (*TriNode) Expr 

func (m *TriNode) Expr() *Expr

func (*TriNode) FromExpr 

func (m *TriNode) FromExpr(e *Expr) error

func (*TriNode) FromPB 

func (m *TriNode) FromPB(n *NodePb) Node

func (*TriNode) Negated 

func (m *TriNode) Negated() bool

func (*TriNode) NodePb 

func (m *TriNode) NodePb() *NodePb

func (*TriNode) NodeType 

func (m *TriNode) NodeType() string

func (*TriNode) ReverseNegation 

func (m *TriNode) ReverseNegation() bool

func (*TriNode) String 

func (m *TriNode) String() string

func (*TriNode) StringNegate 

func (m *TriNode) StringNegate() string

func (*TriNode) Validate 

func (m *TriNode) Validate() error

func (*TriNode) WriteDialect 

func (m *TriNode) WriteDialect(w DialectWriter)

func (*TriNode) WriteNegate 

func (m *TriNode) WriteNegate(w DialectWriter)

type TriNodePb 

type TriNodePb struct {
	Op               int32    `protobuf:"varint,1,req,name=op" json:"op"`
	Args             []NodePb `protobuf:"bytes,2,rep,name=args" json:"args"`
	XXX_unrecognized []byte   `json:"-"`
}

Tri Node, may hve children

func (*TriNodePb) Descriptor 

func (*TriNodePb) Descriptor() ([]byte, []int)

func (*TriNodePb) Marshal 

func (m *TriNodePb) Marshal() (data []byte, err error)

func (*TriNodePb) MarshalTo 

func (m *TriNodePb) MarshalTo(data []byte) (int, error)

func (*TriNodePb) ProtoMessage 

func (*TriNodePb) ProtoMessage()

func (*TriNodePb) Reset 

func (m *TriNodePb) Reset()

func (*TriNodePb) Size 

func (m *TriNodePb) Size() (n int)

func (*TriNodePb) String 

func (m *TriNodePb) String() string

func (*TriNodePb) Unmarshal 

func (m *TriNodePb) Unmarshal(data []byte) error

type UnaryNode 

type UnaryNode struct {
	Arg      Node
	Operator lex.Token
}

UnaryNode negates a single node argument 

(  not <expression>  |   !<expression> )

!eq(5,6)
!true
!(true OR false)
!toint(now())

func (*UnaryNode) ChildrenArgs 

func (m *UnaryNode) ChildrenArgs() []Node

func (*UnaryNode) Collapse 

func (m *UnaryNode) Collapse() Node

func (*UnaryNode) Equal 

func (m *UnaryNode) Equal(n Node) bool

func (*UnaryNode) Expr 

func (m *UnaryNode) Expr() *Expr

func (*UnaryNode) FromExpr 

func (m *UnaryNode) FromExpr(e *Expr) error

func (*UnaryNode) FromPB 

func (m *UnaryNode) FromPB(n *NodePb) Node

func (*UnaryNode) NodePb 

func (m *UnaryNode) NodePb() *NodePb

func (*UnaryNode) NodeType 

func (m *UnaryNode) NodeType() string

func (*UnaryNode) String 

func (m *UnaryNode) String() string

func (*UnaryNode) Validate 

func (m *UnaryNode) Validate() error

func (*UnaryNode) WriteDialect 

func (m *UnaryNode) WriteDialect(w DialectWriter)

type UnaryNodePb 

type UnaryNodePb struct {
	Op               int32  `protobuf:"varint,1,req,name=op" json:"op"`
	Paren            bool   `protobuf:"varint,2,opt,name=paren" json:"paren"`
	Arg              NodePb `protobuf:"bytes,3,req,name=arg" json:"arg"`
	XXX_unrecognized []byte `json:"-"`
}

Unary Node, one child

func (*UnaryNodePb) Descriptor 

func (*UnaryNodePb) Descriptor() ([]byte, []int)

func (*UnaryNodePb) Marshal 

func (m *UnaryNodePb) Marshal() (data []byte, err error)

func (*UnaryNodePb) MarshalTo 

func (m *UnaryNodePb) MarshalTo(data []byte) (int, error)

func (*UnaryNodePb) ProtoMessage 

func (*UnaryNodePb) ProtoMessage()

func (*UnaryNodePb) Reset 

func (m *UnaryNodePb) Reset()

func (*UnaryNodePb) Size 

func (m *UnaryNodePb) Size() (n int)

func (*UnaryNodePb) String 

func (m *UnaryNodePb) String() string

func (*UnaryNodePb) Unmarshal 

func (m *UnaryNodePb) Unmarshal(data []byte) error

type ValueNode 

type ValueNode struct {
	Value value.Value
	// contains filtered or unexported fields
}

ValueNode holds a value.Value type value.Values can be strings, numbers, arrays, objects, etc

func NewValueNode 

func NewValueNode(val value.Value) *ValueNode

func (*ValueNode) Equal 

func (m *ValueNode) Equal(n Node) bool

func (*ValueNode) Expr 

func (m *ValueNode) Expr() *Expr

func (*ValueNode) FromExpr 

func (m *ValueNode) FromExpr(e *Expr) error

func (*ValueNode) FromPB 

func (m *ValueNode) FromPB(n *NodePb) Node

func (*ValueNode) IsArray 

func (m *ValueNode) IsArray() bool

func (*ValueNode) NodePb 

func (m *ValueNode) NodePb() *NodePb

func (*ValueNode) NodeType 

func (m *ValueNode) NodeType() string

func (*ValueNode) String 

func (m *ValueNode) String() string

func (*ValueNode) Validate 

func (m *ValueNode) Validate() error

func (*ValueNode) WriteDialect 

func (m *ValueNode) WriteDialect(w DialectWriter)

type ValueNodePb 

type ValueNodePb struct {
	Valuetype        int32  `protobuf:"varint,1,req,name=valuetype" json:"valuetype"`
	Value            []byte `protobuf:"bytes,2,req,name=value" json:"value,omitempty"`
	XXX_unrecognized []byte `json:"-"`
}

Value Node

func (*ValueNodePb) Descriptor 

func (*ValueNodePb) Descriptor() ([]byte, []int)

func (*ValueNodePb) Marshal 

func (m *ValueNodePb) Marshal() (data []byte, err error)

func (*ValueNodePb) MarshalTo 

func (m *ValueNodePb) MarshalTo(data []byte) (int, error)

func (*ValueNodePb) ProtoMessage 

func (*ValueNodePb) ProtoMessage()

func (*ValueNodePb) Reset 

func (m *ValueNodePb) Reset()

func (*ValueNodePb) Size 

func (m *ValueNodePb) Size() (n int)

func (*ValueNodePb) String 

func (m *ValueNodePb) String() string

func (*ValueNodePb) Unmarshal 

func (m *ValueNodePb) Unmarshal(data []byte) error

Source Files

View all Source files

Directories

Path Synopsis
Builtin functions are a library of functions natively available in qlbridge expression evaluation although adding your own is easy.
 Builtin functions are a library of functions natively available in qlbridge expression evaluation although adding your own is easy.

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