vm

package

v0.0.0-...-8371fe2 Latest Latest Go to latest Published: Oct 17, 2016 License: MIT Imports: 16 Imported by: 0

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Repository

github.com/prashantv/qlbridge

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Open Source Insights

Documentation ¶

Overview ¶

VM implements the virtual machine runtime/evaluator for the SQL, FilterQL, and Expression evalutors.

Index ¶

Variables
func Eval(ctx expr.EvalContext, arg expr.Node) (value.Value, bool)
func EvalFilterSelect(sel *rel.FilterSelect, inc Includer, writeContext expr.ContextWriter, ...) (bool, error)
func EvalSql(sel *rel.SqlSelect, writeContext expr.ContextWriter, ...) (bool, error)
func LikeCompare(a, b string) (value.BoolValue, bool)
func NewFilterVm(i Includer) *filterql
type EvalBaseContext
type EvaluatorFunc
- func Evaluator(arg expr.Node) EvaluatorFunc
type ExprVm
type Includer
type NoSchema
- func (m *NoSchema) Key() string
type State
- func NewState(vm ExprVm, read expr.ContextReader, write expr.ContextWriter) *State
- func (e *State) Walk(arg expr.Node) (value.Value, bool)
type Vm
- func NewVm(exprText string) (*Vm, error)
- func (m *Vm) Execute(writeContext expr.ContextWriter, readContext expr.ContextReader) (err error)
- func (m *Vm) MarshalJSON() ([]byte, error)

Constants ¶

This section is empty.

Variables ¶

View Source

var (

	// 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")

	// MaxDepth acts as a guard against potentially recursive queries
	MaxDepth = 10000
)

View Source

var (
	ErrUnknownOp       = fmt.Errorf("expr: unknown op type")
	ErrUnknownNodeType = fmt.Errorf("expr: unknown node type")
	ErrExecute         = fmt.Errorf("Could not execute")

	SchemaInfoEmpty = &NoSchema{}
)

Functions ¶

func Eval ¶

func Eval(ctx expr.EvalContext, arg expr.Node) (value.Value, bool)

func EvalFilterSelect ¶

func EvalFilterSelect(sel *rel.FilterSelect, inc Includer, writeContext expr.ContextWriter, readContext expr.ContextReader) (bool, error)

EvalFilerSelect applies a FilterSelect statement to the specified contexts

@writeContext = Write results of projection
@readContext  = Message input, ie evaluate for Where/Filter clause

func EvalSql ¶

func EvalSql(sel *rel.SqlSelect, writeContext expr.ContextWriter, readContext expr.ContextReader) (bool, error)

Eval applies a sql statement to the specified context

@writeContext = Write out results of projection
@readContext  = Message to evaluate does it match where clause?  if so proceed to projection

func LikeCompare ¶

func LikeCompare(a, b string) (value.BoolValue, bool)

func NewFilterVm ¶

func NewFilterVm(i Includer) *filterql

Types ¶

type EvalBaseContext ¶

type EvalBaseContext struct {
	expr.ContextReader
}

type EvaluatorFunc ¶

type EvaluatorFunc func(ctx expr.EvalContext) (value.Value, bool)

func Evaluator ¶

func Evaluator(arg expr.Node) EvaluatorFunc

type ExprVm ¶

type ExprVm interface {
	Execute(writeContext expr.ContextWriter, readContext expr.ContextReader) error
}

type Includer ¶

type Includer interface {
	Include(name string) (*rel.FilterStatement, error)
}

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

type NoSchema ¶

type NoSchema struct {
}

func (*NoSchema) Key ¶

func (m *NoSchema) Key() string

type State ¶

type State struct {
	ExprVm // reference to the VM operating on this state

	expr.ContextReader
	Writer expr.ContextWriter
	// contains filtered or unexported fields
}

func NewState ¶

func NewState(vm ExprVm, read expr.ContextReader, write expr.ContextWriter) *State

func (*State) Walk ¶

func (e *State) Walk(arg expr.Node) (value.Value, bool)

type Vm ¶

type Vm struct {
	*expr.Tree
}

A node vm is a vm for parsing, evaluating a single tree-node

func NewVm ¶

func NewVm(exprText string) (*Vm, error)

func (*Vm) Execute ¶

func (m *Vm) Execute(writeContext expr.ContextWriter, readContext expr.ContextReader) (err error)

Execute applies a parse expression to the specified context's

func (*Vm) MarshalJSON ¶

func (m *Vm) MarshalJSON() ([]byte, error)

Source Files ¶

View all Source files

Directories ¶

Path	Synopsis
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