eval

package module
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 Go to latest Published: Nov 14, 2014 License: BSD-3-Clause Imports: 13 Imported by: 0

README

eval - A library for providing an eval function in Go

Build Status

This project adds an Eval() function to go.

Right now only, Go expressions are handled.

Using

The simplest invocation is

	results, panik, compileErrs := Eval("1 + 2")
	// results = []reflect.Value{reflect.ValueOf(3)}
	// panik = error(nil)
	// compileErrs = []error(nil)

Results are reflect.Values, and in reality Eval is nothing more than a fancy wrapper around the reflect package. Runtime panics should be detected during evaluation and returned as panik, if an actual runtime panic occurs please file a bug. Any parse or type errors are returned as compileErrs; it is nil otherwise.

EvalEnv evaluates an expression inside an environment containing variables, constants, functions, types and packages.

	type T int
	x := 1
	sum := func(xs ...int) (result int) {
		for _, x := range xs {
			result += x
		}
		return result
	}
	env := eval.MakeSimpleEnv()
	// Note the &x
	env.Vars["x"] = reflect.ValueOf(&x)
	env.Funcs["sum"] = reflect.ValueOf(f)
	env.Types["T"] = reflect.TypeOf(T(0))
	pkg := MakeSimpleEnv()
	pkg.Consts["C"] = reflect.ValueOf(2)
	env.Pkgs["pkg"] = pkg
	results, panik, compileErrs := EvalEnv("T(sum(1, x, pkg.C))", env)

Extended API

The extented API allows step by step execution of the evaluator. The dance is three part

  • Parse
  • Check
  • Eval
	env := eval.MakeSimpleEnv()
	if expr, err := parser.ParseExpr(expr); err != nil {
		fmt.Printf("parse error: %s\n", err)
	} else if cexpr, errs := eval.CheckExpr(expr, env); len(errs) != 0 {
		for _, cerr := range errs {
			fmt.Printf("%v\n", cerr)
		}
	} else if vals, _, err := eval.EvalExpr(cexpr, env); err != nil {
		fmt.Printf("eval error: %s\n", err)
	} else {
	  // do something with pointer to reflect.Value array vals, e.g.:
	  fmt.Println(vals[0].Interface())
	}

The program repl.go is a full Go program showing this.

Limitations

Eval is currently limited to the functionality of the reflect package.

Most noteably, the following are not implemented as they cannot be created:

  • struct literals
  • array literals
  • function literals

Struct and Array composite named types can still be constructed. E.g.

	env.Types["A"] = reflect.TypeOf([2]int{})
	EvalEnv("A{1, 2}", env)

In theory this could also work for named Function literals, but this has not been implemented.

See Also

  • What's left to do?
  • go-fish: an interactive read, eval, print loop which uses this to handle the eval() step. In that project, see the program make_eval for how to create a complete environment given an initial import.
  • gack: another experimental REPL which implements import by continuously recompiling the executable.
  • gub debugger: a debugger that uses this to handle the eval debugger command

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var (
	ConstInt        = ConstIntType{reflect.TypeOf(0)}
	ConstShiftedInt = ConstShiftedIntType{reflect.TypeOf(0)}
	ConstRune       = ConstRuneType{RuneType}
	ConstFloat      = ConstFloatType{reflect.TypeOf(0.0)}
	ConstComplex    = ConstComplexType{reflect.TypeOf(0i)}
	ConstString     = ConstStringType{reflect.TypeOf("")}
	ConstNil        = ConstNilType{nil}
	ConstBool       = ConstBoolType{reflect.TypeOf(false)}
)
View Source 
var ByteType = Byte{reflect.TypeOf(byte(0))}
View Source 
var RuneType = Rune{reflect.TypeOf(rune(0))}

Functions

func Eval 

func Eval(expr string) (result []reflect.Value, panik error, compileErrors []error)

func EvalEnv 

func EvalEnv(expr string, env Env) (result []reflect.Value, panik error, compileErrors []error)

func EvalExpr 

func EvalExpr(expr Expr, env Env) ([]reflect.Value, error)

EvalExpr is the main function to call to evaluate an ast-parsed expression, expr. Parameter env, contains an evaluation environment from which to get reflect.Values from. Note however that env can be subverted somewhat by supplying callback hooks routines which access variables and by supplying user-defined conversion routines.

func FormatErrorPos 

func FormatErrorPos(source, errmsg string) (cursored []string)

FormatErrorPos formats source to show the position that a (parse) error occurs. When this works, it returns a slice of one or two strings: the source line with the error and if it can find a column position under that, a line indicating the position where the error occurred.

For example, if we have: 

source := `split(os.Args ", )")`
errmsg := "1:15: expected ')'"

then PrintErrPos(source, errmsg) returns: 

 {
		`split(os.Args ", )")`,
		`-------------^`
 }

If something is wrong parsing the error message or matching it with the source, an empty slice is returned.

func Inspect 

func Inspect(val reflect.Value) string

Inspect prints a reflect.Value the way you would enter it. Some like this should really be part of the reflect package.

func InspectShort 

func InspectShort(val reflect.Value) string

Returns type{...} for composite lits

func Interpret 

func Interpret(stmt string, env Env) (result []reflect.Value, panik error, compileErrors []error)

func ParseStmt 

func ParseStmt(stmt string) (ast.Stmt, error)

A convenience function for parsing a Stmt by wrapping it in a func literal

Types

type ArrayType 

type ArrayType struct {
	*ast.ArrayType
	Len Expr
	Elt Expr
	// contains filtered or unexported fields
}

func (*ArrayType) Const 

func (*ArrayType) Const() reflect.Value

func (*ArrayType) IsConst 

func (*ArrayType) IsConst() bool

func (ArrayType) KnownType 

func (t ArrayType) KnownType() []reflect.Type

func (*ArrayType) String 

func (arrayType *ArrayType) String() string

type AssignStmt 

type AssignStmt struct {
	*ast.AssignStmt
	Lhs []Expr
	Rhs []Expr
	// contains filtered or unexported fields
}

type BadExpr 

type BadExpr struct {
	*ast.BadExpr
}

func (*BadExpr) Const 

func (*BadExpr) Const() reflect.Value

func (*BadExpr) IsConst 

func (*BadExpr) IsConst() bool

func (*BadExpr) KnownType 

func (*BadExpr) KnownType() []reflect.Type

func (*BadExpr) String 

func (badExpr *BadExpr) String() string

type BasicLit 

type BasicLit struct {
	*ast.BasicLit
	// contains filtered or unexported fields
}

func (BasicLit) Const 

func (c BasicLit) Const() reflect.Value

func (BasicLit) IsConst 

func (c BasicLit) IsConst() bool

func (BasicLit) KnownType 

func (t BasicLit) KnownType() []reflect.Type

func (*BasicLit) String 

func (basicLit *BasicLit) String() string

type BigComplex 

type BigComplex struct {
	Re big.Rat
	Im big.Rat
}

BigComplex behaves like a *big.Re, but has an imaginary component and separate implementation for + - * /

func (*BigComplex) Add 

func (z *BigComplex) Add(x, y *BigComplex) *BigComplex

func (*BigComplex) Complex128 

func (z *BigComplex) Complex128() (_ complex128, exact bool)

z.Complex128() returns a complex128 representation of z. Return value exact will be true if the conversion was completed without loss of precision.

func (*BigComplex) Equals 

func (z *BigComplex) Equals(other *BigComplex) bool

func (*BigComplex) Float64 

func (z *BigComplex) Float64() (f float64, truncation, exact bool)

z.Float64() returns a representation of z truncated to a float64 If a truncation from a complex occurs. The imaginary part is dropped and the conversion continues as usual. return value truncation will be true exact will be true if the conversion was completed without loss of precision.

func (*BigComplex) Int 

func (z *BigComplex) Int(bits int) (_ int64, truncation, overflow bool)

z.Int() returns a representation of z, truncated to be an int of length bits. Valid values for bits are 8, 16, 32, 64. Result is otherwise undefined If a truncation occurs, the decimal part is dropped and the conversion continues as usual. truncation will be true If an overflow occurs, the result is equivelant to a cast of the form int32(x). overflow will be true.

func (*BigComplex) Integer 

func (z *BigComplex) Integer() (_ *BigComplex, truncation bool)

z.Integer() returns a representation of z, a *BigComplex, truncated to be a integer value. The second return value is true if a truncation occured in the real component.

func (*BigComplex) IsInteger 

func (z *BigComplex) IsInteger() bool

func (*BigComplex) IsReal 

func (z *BigComplex) IsReal() bool

func (*BigComplex) IsZero 

func (z *BigComplex) IsZero() bool

func (*BigComplex) Lsh 

func (z *BigComplex) Lsh(x *BigComplex, count uint) *BigComplex

func (*BigComplex) Mul 

func (z *BigComplex) Mul(x, y *BigComplex) *BigComplex

func (*BigComplex) Quo 

func (z *BigComplex) Quo(x, y *BigComplex) *BigComplex

func (*BigComplex) Real 

func (z *BigComplex) Real() (_ *BigComplex, truncation bool)

z.Real() returns a representation of z, truncated to a real value. The second return valuie is true if a truncation occured.

func (*BigComplex) Rsh 

func (z *BigComplex) Rsh(x *BigComplex, count uint) *BigComplex

func (*BigComplex) String 

func (z *BigComplex) String() string

func (*BigComplex) StringShow0i 

func (z *BigComplex) StringShow0i(show0i bool) string

func (*BigComplex) Sub 

func (z *BigComplex) Sub(x, y *BigComplex) *BigComplex

func (*BigComplex) Uint 

func (z *BigComplex) Uint(bits int) (_ uint64, truncation, overflow bool)

z.Uint() returns a representation of z truncated to be a uint of length bits. Valid values for bits are 0, 8, 16, 32, 64. The returned result is otherwise undefined. If a truncation occurs, the decimal part is dropped and the conversion continues as usual. Return values truncation and overflow will be true if an overflow occurs. The result is equivelant to a cast of the form uint32(x).

type BinaryExpr 

type BinaryExpr struct {
	*ast.BinaryExpr
	X Expr
	Y Expr
	// contains filtered or unexported fields
}

func (BinaryExpr) Const 

func (c BinaryExpr) Const() reflect.Value

func (BinaryExpr) IsConst 

func (c BinaryExpr) IsConst() bool

func (BinaryExpr) KnownType 

func (t BinaryExpr) KnownType() []reflect.Type

func (BinaryExpr) Op 

func (b BinaryExpr) Op() token.Token

func (*BinaryExpr) String 

func (binary *BinaryExpr) String() string

type BlockStmt 

type BlockStmt struct {
	*ast.BlockStmt
	List []Stmt
}

type BranchStmt 

type BranchStmt struct {
	*ast.BranchStmt
	Label *Ident
}

type Byte 

type Byte struct {
	reflect.Type
}

func (Byte) Name 

func (Byte) Name() string

func (Byte) String 

func (Byte) String() string

type CallExpr 

type CallExpr struct {
	*ast.CallExpr
	Fun  Expr
	Args []Expr
	// contains filtered or unexported fields
}

func (CallExpr) Const 

func (c CallExpr) Const() reflect.Value

func (CallExpr) IsConst 

func (c CallExpr) IsConst() bool

func (CallExpr) KnownType 

func (t CallExpr) KnownType() []reflect.Type

func (*CallExpr) String 

func (call *CallExpr) String() string

type CaseClause 

type CaseClause struct {
	*ast.CaseClause
	List []Expr
	Body []Stmt
}

type ChanType 

type ChanType struct {
	*ast.ChanType
	Value Expr
	// contains filtered or unexported fields
}

func (*ChanType) Const 

func (*ChanType) Const() reflect.Value

func (*ChanType) IsConst 

func (*ChanType) IsConst() bool

func (ChanType) KnownType 

func (t ChanType) KnownType() []reflect.Type

func (*ChanType) String 

func (chanType *ChanType) String() string

type CompositeLit 

type CompositeLit struct {
	*ast.CompositeLit
	Elts []Expr
	// contains filtered or unexported fields
}

func (*CompositeLit) Const 

func (*CompositeLit) Const() reflect.Value

func (*CompositeLit) IsConst 

func (*CompositeLit) IsConst() bool

func (CompositeLit) KnownType 

func (t CompositeLit) KnownType() []reflect.Type

func (*CompositeLit) String 

func (lit *CompositeLit) String() string

type ConstBoolType 

type ConstBoolType struct{ reflect.Type }

func (ConstBoolType) DefaultPromotion 

func (c ConstBoolType) DefaultPromotion() reflect.Type

func (ConstBoolType) IsIntegral 

func (ConstBoolType) IsIntegral() bool

func (ConstBoolType) IsNumeric 

func (ConstBoolType) IsNumeric() bool

func (ConstBoolType) IsReal 

func (ConstBoolType) IsReal() bool

func (ConstBoolType) String 

func (ConstBoolType) String() string

type ConstComplexType 

type ConstComplexType struct{ reflect.Type }

func (ConstComplexType) DefaultPromotion 

func (c ConstComplexType) DefaultPromotion() reflect.Type

func (ConstComplexType) IsIntegral 

func (ConstComplexType) IsIntegral() bool

func (ConstComplexType) IsNumeric 

func (ConstComplexType) IsNumeric() bool

func (ConstComplexType) IsReal 

func (ConstComplexType) IsReal() bool

func (ConstComplexType) String 

func (ConstComplexType) String() string

type ConstFloatType 

type ConstFloatType struct{ reflect.Type }

func (ConstFloatType) DefaultPromotion 

func (c ConstFloatType) DefaultPromotion() reflect.Type

func (ConstFloatType) IsIntegral 

func (ConstFloatType) IsIntegral() bool

func (ConstFloatType) IsNumeric 

func (ConstFloatType) IsNumeric() bool

func (ConstFloatType) IsReal 

func (ConstFloatType) IsReal() bool

func (ConstFloatType) String 

func (ConstFloatType) String() string

type ConstIntType 

type ConstIntType struct{ reflect.Type }

func (ConstIntType) DefaultPromotion 

func (c ConstIntType) DefaultPromotion() reflect.Type

func (ConstIntType) IsIntegral 

func (ConstIntType) IsIntegral() bool

func (ConstIntType) IsNumeric 

func (ConstIntType) IsNumeric() bool

func (ConstIntType) IsReal 

func (ConstIntType) IsReal() bool

func (ConstIntType) String 

func (ConstIntType) String() string

type ConstNilType 

type ConstNilType struct{ reflect.Type }

func (ConstNilType) DefaultPromotion 

func (c ConstNilType) DefaultPromotion() reflect.Type

func (ConstNilType) IsIntegral 

func (ConstNilType) IsIntegral() bool

func (ConstNilType) IsNumeric 

func (ConstNilType) IsNumeric() bool

func (ConstNilType) IsReal 

func (ConstNilType) IsReal() bool

func (ConstNilType) String 

func (ConstNilType) String() string

type ConstNumber 

type ConstNumber struct {
	Value BigComplex
	Type  ConstType
}

func NewConstComplex128 

func NewConstComplex128(c complex128) *ConstNumber

func NewConstFloat 

func NewConstFloat(r string) (*ConstNumber, bool)

Use with token.FLOAT ast.BasicLit

func NewConstFloat64 

func NewConstFloat64(f float64) *ConstNumber

func NewConstImag 

func NewConstImag(i string) (*ConstNumber, bool)

Use with token.IMAG ast.BasicLit

func NewConstInt64 

func NewConstInt64(i int64) *ConstNumber

func NewConstInteger 

func NewConstInteger(i string) (*ConstNumber, bool)

Use with token.INT ast.BasicLit

func NewConstRune 

func NewConstRune(n rune) *ConstNumber

Use with token.CHAR ast.BasicLit

func NewConstUint64 

func NewConstUint64(u uint64) *ConstNumber

func (*ConstNumber) Add 

func (z *ConstNumber) Add(x, y *ConstNumber) *ConstNumber

Add two ConstNumbers, promoting the type automatically.

func (*ConstNumber) And 

func (z *ConstNumber) And(x, y *ConstNumber) *ConstNumber

z.And compute logical "and" of two ConstNumbers, promoting the type automatically. The result is undefined if both x and y are not integral types.

func (*ConstNumber) AndNot 

func (z *ConstNumber) AndNot(x, y *ConstNumber) *ConstNumber

z.AndNot computes "and not" of two ConstNumbers, promoting the type automatically. The result is undefined if both x and y are not integral types.

func (*ConstNumber) Lsh 

func (z *ConstNumber) Lsh(x *ConstNumber, count uint) *ConstNumber

z.Shl() shifts x left by count. Type is set to ConstShiftedInt

func (*ConstNumber) Mul 

func (z *ConstNumber) Mul(x, y *ConstNumber) *ConstNumber

z.Mul multiplies two ConstNumbers, promoting the type automatically.

func (*ConstNumber) Or 

func (z *ConstNumber) Or(x, y *ConstNumber) *ConstNumber

z.Or computes the logical "o"r of two ConstNumbers, promoting the type automatically. The result is undefined if both x and y are not integral types.

func (*ConstNumber) Quo 

func (z *ConstNumber) Quo(x, y *ConstNumber) *ConstNumber

z.Quo divides two ConstNumbers, promoting the type automatically. If both operands are of ConstInt, then integer division is performed.

func (*ConstNumber) Rem 

func (z *ConstNumber) Rem(x, y *ConstNumber) *ConstNumber

z.Rem computes remainder of two ConstNumbers, promoting the type automatically. The result is undefined if both x and y are not integral types.

func (*ConstNumber) Rsh 

func (z *ConstNumber) Rsh(x *ConstNumber, count uint) *ConstNumber

z.Shl() shifts x right by count. Type is set to ConstShiftedInt

func (*ConstNumber) String 

func (z *ConstNumber) String() string

func (*ConstNumber) StringShow0i 

func (z *ConstNumber) StringShow0i(show0i bool) string

func (*ConstNumber) Sub 

func (z *ConstNumber) Sub(x, y *ConstNumber) *ConstNumber

z.Sub() subtracts two ConstNumbers, promoting the type automatically.

func (*ConstNumber) Xor 

func (z *ConstNumber) Xor(x, y *ConstNumber) *ConstNumber

z.Xor computes the exclusive "or" of two ConstNumbers, promoting the type automatically. The result is undefined if both x and y are not integral types.

type ConstRuneType 

type ConstRuneType struct{ reflect.Type }

func (ConstRuneType) DefaultPromotion 

func (c ConstRuneType) DefaultPromotion() reflect.Type

func (ConstRuneType) IsIntegral 

func (ConstRuneType) IsIntegral() bool

func (ConstRuneType) IsNumeric 

func (ConstRuneType) IsNumeric() bool

func (ConstRuneType) IsReal 

func (ConstRuneType) IsReal() bool

func (ConstRuneType) String 

func (ConstRuneType) String() string

type ConstShiftedIntType 

type ConstShiftedIntType struct{ reflect.Type }

func (ConstShiftedIntType) DefaultPromotion 

func (c ConstShiftedIntType) DefaultPromotion() reflect.Type

func (ConstShiftedIntType) IsIntegral 

func (ConstShiftedIntType) IsIntegral() bool

func (ConstShiftedIntType) IsNumeric 

func (ConstShiftedIntType) IsNumeric() bool

func (ConstShiftedIntType) IsReal 

func (ConstShiftedIntType) IsReal() bool

func (ConstShiftedIntType) String 

func (ConstShiftedIntType) String() string

type ConstStringType 

type ConstStringType struct{ reflect.Type }

func (ConstStringType) DefaultPromotion 

func (c ConstStringType) DefaultPromotion() reflect.Type

func (ConstStringType) IsIntegral 

func (ConstStringType) IsIntegral() bool

func (ConstStringType) IsNumeric 

func (ConstStringType) IsNumeric() bool

func (ConstStringType) IsReal 

func (ConstStringType) IsReal() bool

func (ConstStringType) String 

func (ConstStringType) String() string

type ConstType 

type ConstType interface {
	reflect.Type
	IsIntegral() bool
	IsReal() bool
	IsNumeric() bool

	// The go type the ConstType is promoted to by default
	DefaultPromotion() reflect.Type
}

Type ConstType can annotate information needed for evaluating const expressions. It should not be used with the reflect package.

type Ellipsis 

type Ellipsis struct {
	*ast.Ellipsis
	// contains filtered or unexported fields
}

func (*Ellipsis) Const 

func (*Ellipsis) Const() reflect.Value

func (*Ellipsis) IsConst 

func (*Ellipsis) IsConst() bool

func (Ellipsis) KnownType 

func (t Ellipsis) KnownType() []reflect.Type

func (*Ellipsis) String 

func (ellipsis *Ellipsis) String() string

type EmptyStmt 

type EmptyStmt struct {
	*ast.EmptyStmt
}

type Env 

type Env interface {
	// Return a pointer value to the variable ident if defined in the top scope, or reflect.Value{} otherwise
	Var(ident string) reflect.Value

	// Return the const value ident if defined in the top scope, or reflect.Value{} otherwise
	Const(ident string) reflect.Value

	// Return the func value ident if defined in the top scope, or reflect.Value{} otherwise
	Func(ident string) reflect.Value

	// Return the type ident if defined in the top scope, or reflect.Value{} otherwise
	Type(ident string) reflect.Type

	// Return the environment containing vars, consts, funcs and types of pkg, or nil if not defined.
	// Unlike other lookup methods, packages exist only in the root scope.
	Pkg(pkg string) Env

	// Create a new block scope. Only the behaviour of the returned Env should change
	PushScope() Env

	// Pop the top block scope. Only the behaviour of the returned Env should change
	PopScope() Env

	// Add var ident to the top scope. The value is always a pointer value, and this same value should be
	// returned by Var(ident). It is up to the implementation how to handle duplicate identifiers.
	AddVar(ident string, v reflect.Value)

	// Add const ident to the top scope. It is up to the implementation how to handle duplicate identifiers.
	AddConst(ident string, c reflect.Value)

	// Add func ident to the top scope. It is up to the implementation how to handle duplicate identifiers.
	AddFunc(ident string, f reflect.Value)

	// Add type ident to the top scope. It is up to the implementation how to handle duplicate identifiers.
	AddType(ident string, t reflect.Type)

	// Add pkg to the root scope. It is up to the implementation how to handle duplicate identifiers.
	AddPkg(pkg string, p Env)
}

A Environment used for evaluation

type ErrAppendFirstArgNotSlice 

type ErrAppendFirstArgNotSlice struct {
	Expr
}

func (ErrAppendFirstArgNotSlice) Error 

func (err ErrAppendFirstArgNotSlice) Error() string

type ErrAppendFirstArgNotVariadic 

type ErrAppendFirstArgNotVariadic struct {
	Expr
}

func (ErrAppendFirstArgNotVariadic) Error 

func (err ErrAppendFirstArgNotVariadic) Error() string

type ErrArrayKeyOutOfBounds 

type ErrArrayKeyOutOfBounds struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrArrayKeyOutOfBounds) Error 

func (err ErrArrayKeyOutOfBounds) Error() string

type ErrAssignCountMismatch 

type ErrAssignCountMismatch struct {
	*AssignStmt
	// contains filtered or unexported fields
}

func (ErrAssignCountMismatch) Error 

func (err ErrAssignCountMismatch) Error() string

type ErrBadArrayKey 

type ErrBadArrayKey struct {
	Expr
}

func (ErrBadArrayKey) Error 

func (ErrBadArrayKey) Error() string

type ErrBadArrayValue 

type ErrBadArrayValue struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrBadArrayValue) Error 

func (err ErrBadArrayValue) Error() string

type ErrBadBasicLit 

type ErrBadBasicLit struct {
	*BasicLit
}

func (ErrBadBasicLit) Const 

func (c ErrBadBasicLit) Const() reflect.Value

func (ErrBadBasicLit) Error 

func (err ErrBadBasicLit) Error() string

func (ErrBadBasicLit) IsConst 

func (c ErrBadBasicLit) IsConst() bool

func (ErrBadBasicLit) KnownType 

func (t ErrBadBasicLit) KnownType() []reflect.Type

type ErrBadConstConversion 

type ErrBadConstConversion struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrBadConstConversion) Error 

func (err ErrBadConstConversion) Error() string

type ErrBadConversion 

type ErrBadConversion struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrBadConversion) Error 

func (err ErrBadConversion) Error() string

type ErrBadMapIndex 

type ErrBadMapIndex struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrBadMapIndex) Error 

func (err ErrBadMapIndex) Error() string

type ErrBadMapKey 

type ErrBadMapKey struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrBadMapKey) Error 

func (err ErrBadMapKey) Error() string

type ErrBadMapValue 

type ErrBadMapValue struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrBadMapValue) Error 

func (err ErrBadMapValue) Error() string

type ErrBadReturnValue 

type ErrBadReturnValue struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrBadReturnValue) Error 

func (err ErrBadReturnValue) Error() string

type ErrBadStructValue 

type ErrBadStructValue struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrBadStructValue) Error 

func (err ErrBadStructValue) Error() string

type ErrBuiltinInvalidEllipsis 

type ErrBuiltinInvalidEllipsis struct {
	*CallExpr
}

func (ErrBuiltinInvalidEllipsis) Const 

func (c ErrBuiltinInvalidEllipsis) Const() reflect.Value

func (ErrBuiltinInvalidEllipsis) Error 

func (err ErrBuiltinInvalidEllipsis) Error() string

func (ErrBuiltinInvalidEllipsis) IsConst 

func (c ErrBuiltinInvalidEllipsis) IsConst() bool

func (ErrBuiltinInvalidEllipsis) KnownType 

func (t ErrBuiltinInvalidEllipsis) KnownType() []reflect.Type

type ErrBuiltinMismatchedArgs 

type ErrBuiltinMismatchedArgs struct {
	*CallExpr
	// contains filtered or unexported fields
}

func (ErrBuiltinMismatchedArgs) Const 

func (c ErrBuiltinMismatchedArgs) Const() reflect.Value

func (ErrBuiltinMismatchedArgs) Error 

func (err ErrBuiltinMismatchedArgs) Error() string

func (ErrBuiltinMismatchedArgs) IsConst 

func (c ErrBuiltinMismatchedArgs) IsConst() bool

func (ErrBuiltinMismatchedArgs) KnownType 

func (t ErrBuiltinMismatchedArgs) KnownType() []reflect.Type

type ErrBuiltinNonTypeArg 

type ErrBuiltinNonTypeArg struct {
	Expr
}

func (ErrBuiltinNonTypeArg) Error 

func (err ErrBuiltinNonTypeArg) Error() string

type ErrBuiltinWrongArgType 

type ErrBuiltinWrongArgType struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrBuiltinWrongArgType) Error 

func (err ErrBuiltinWrongArgType) Error() string

type ErrBuiltinWrongNumberOfArgs 

type ErrBuiltinWrongNumberOfArgs struct {
	*CallExpr
}

func (ErrBuiltinWrongNumberOfArgs) Const 

func (c ErrBuiltinWrongNumberOfArgs) Const() reflect.Value

func (ErrBuiltinWrongNumberOfArgs) Error 

func (err ErrBuiltinWrongNumberOfArgs) Error() string

func (ErrBuiltinWrongNumberOfArgs) IsConst 

func (c ErrBuiltinWrongNumberOfArgs) IsConst() bool

func (ErrBuiltinWrongNumberOfArgs) KnownType 

func (t ErrBuiltinWrongNumberOfArgs) KnownType() []reflect.Type

type ErrCallNonFuncType 

type ErrCallNonFuncType struct {
	Expr
}

func (ErrCallNonFuncType) Error 

func (err ErrCallNonFuncType) Error() string

type ErrCannotAssignToType 

type ErrCannotAssignToType struct {
	Expr //lhs
	// contains filtered or unexported fields
}

func (ErrCannotAssignToType) Error 

func (err ErrCannotAssignToType) Error() string

type ErrCannotAssignToUnaddressable 

type ErrCannotAssignToUnaddressable struct {
	Expr
}

func (ErrCannotAssignToUnaddressable) Error 

func (err ErrCannotAssignToUnaddressable) Error() string

type ErrCopyArgsHaveDifferentEltTypes 

type ErrCopyArgsHaveDifferentEltTypes struct {
	*CallExpr
	// contains filtered or unexported fields
}

func (ErrCopyArgsHaveDifferentEltTypes) Const 

func (c ErrCopyArgsHaveDifferentEltTypes) Const() reflect.Value

func (ErrCopyArgsHaveDifferentEltTypes) Error 

func (err ErrCopyArgsHaveDifferentEltTypes) Error() string

func (ErrCopyArgsHaveDifferentEltTypes) IsConst 

func (c ErrCopyArgsHaveDifferentEltTypes) IsConst() bool

func (ErrCopyArgsHaveDifferentEltTypes) KnownType 

func (t ErrCopyArgsHaveDifferentEltTypes) KnownType() []reflect.Type

type ErrCopyArgsMustBeSlices 

type ErrCopyArgsMustBeSlices struct {
	*CallExpr
	// contains filtered or unexported fields
}

func (ErrCopyArgsMustBeSlices) Const 

func (c ErrCopyArgsMustBeSlices) Const() reflect.Value

func (ErrCopyArgsMustBeSlices) Error 

func (err ErrCopyArgsMustBeSlices) Error() string

func (ErrCopyArgsMustBeSlices) IsConst 

func (c ErrCopyArgsMustBeSlices) IsConst() bool

func (ErrCopyArgsMustBeSlices) KnownType 

func (t ErrCopyArgsMustBeSlices) KnownType() []reflect.Type

type ErrDeleteFirstArgNotMap 

type ErrDeleteFirstArgNotMap struct {
	Expr
}

func (ErrDeleteFirstArgNotMap) Error 

func (err ErrDeleteFirstArgNotMap) Error() string

type ErrDivideByZero 

type ErrDivideByZero struct {
	*BinaryExpr
}

func (ErrDivideByZero) Const 

func (c ErrDivideByZero) Const() reflect.Value

func (ErrDivideByZero) Error 

func (err ErrDivideByZero) Error() string

func (ErrDivideByZero) IsConst 

func (c ErrDivideByZero) IsConst() bool

func (ErrDivideByZero) KnownType 

func (t ErrDivideByZero) KnownType() []reflect.Type

type ErrDuplicateArg 

type ErrDuplicateArg struct {
	*Ident
}

func (ErrDuplicateArg) Const 

func (c ErrDuplicateArg) Const() reflect.Value

func (ErrDuplicateArg) Error 

func (err ErrDuplicateArg) Error() string

func (ErrDuplicateArg) IsConst 

func (c ErrDuplicateArg) IsConst() bool

func (ErrDuplicateArg) KnownType 

func (t ErrDuplicateArg) KnownType() []reflect.Type

type ErrDuplicateArrayKey 

type ErrDuplicateArrayKey struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrDuplicateArrayKey) Error 

func (err ErrDuplicateArrayKey) Error() string

type ErrDuplicateMapKey 

type ErrDuplicateMapKey struct {
	Expr
}

func (ErrDuplicateMapKey) Error 

func (err ErrDuplicateMapKey) Error() string

type ErrDuplicateStructField 

type ErrDuplicateStructField struct {
	*Ident
	// contains filtered or unexported fields
}

func (ErrDuplicateStructField) Const 

func (c ErrDuplicateStructField) Const() reflect.Value

func (ErrDuplicateStructField) Error 

func (err ErrDuplicateStructField) Error() string

func (ErrDuplicateStructField) IsConst 

func (c ErrDuplicateStructField) IsConst() bool

func (ErrDuplicateStructField) KnownType 

func (t ErrDuplicateStructField) KnownType() []reflect.Type

type ErrImpossibleTypeAssert 

type ErrImpossibleTypeAssert struct {
	*TypeAssertExpr
}

func (ErrImpossibleTypeAssert) Error 

func (err ErrImpossibleTypeAssert) Error() string

func (ErrImpossibleTypeAssert) KnownType 

func (t ErrImpossibleTypeAssert) KnownType() []reflect.Type

type ErrImpossibleTypeCase 

type ErrImpossibleTypeCase struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrImpossibleTypeCase) Error 

func (err ErrImpossibleTypeCase) Error() string

type ErrIndexOutOfBounds 

type ErrIndexOutOfBounds struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrIndexOutOfBounds) Error 

func (err ErrIndexOutOfBounds) Error() string

type ErrInvalidAddressOf 

type ErrInvalidAddressOf struct {
	Expr
}

func (ErrInvalidAddressOf) Error 

func (err ErrInvalidAddressOf) Error() string

type ErrInvalidBinaryOperation 

type ErrInvalidBinaryOperation struct {
	*BinaryExpr
}

func (ErrInvalidBinaryOperation) Const 

func (c ErrInvalidBinaryOperation) Const() reflect.Value

func (ErrInvalidBinaryOperation) Error 

func (err ErrInvalidBinaryOperation) Error() string

func (ErrInvalidBinaryOperation) IsConst 

func (c ErrInvalidBinaryOperation) IsConst() bool

func (ErrInvalidBinaryOperation) KnownType 

func (t ErrInvalidBinaryOperation) KnownType() []reflect.Type

type ErrInvalidCase 

type ErrInvalidCase struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrInvalidCase) Error 

func (err ErrInvalidCase) Error() string

type ErrInvalidEllipsisInCall 

type ErrInvalidEllipsisInCall struct {
	*CallExpr
}

func (ErrInvalidEllipsisInCall) Const 

func (c ErrInvalidEllipsisInCall) Const() reflect.Value

func (ErrInvalidEllipsisInCall) Error 

func (err ErrInvalidEllipsisInCall) Error() string

func (ErrInvalidEllipsisInCall) IsConst 

func (c ErrInvalidEllipsisInCall) IsConst() bool

func (ErrInvalidEllipsisInCall) KnownType 

func (t ErrInvalidEllipsisInCall) KnownType() []reflect.Type

type ErrInvalidIndex 

type ErrInvalidIndex struct {
	Expr
	// contains filtered or unexported fields
}

type ErrInvalidIndexOperation 

type ErrInvalidIndexOperation struct {
	*IndexExpr
}

func (ErrInvalidIndexOperation) Error 

func (err ErrInvalidIndexOperation) Error() string

func (ErrInvalidIndexOperation) KnownType 

func (t ErrInvalidIndexOperation) KnownType() []reflect.Type

type ErrInvalidIndirect 

type ErrInvalidIndirect struct {
	Expr
}

func (ErrInvalidIndirect) Error 

func (err ErrInvalidIndirect) Error() string

type ErrInvalidRecvFrom 

type ErrInvalidRecvFrom struct {
	Expr
}

func (ErrInvalidRecvFrom) Error 

func (err ErrInvalidRecvFrom) Error() string

type ErrInvalidSliceIndex 

type ErrInvalidSliceIndex struct {
	*SliceExpr
}

func (ErrInvalidSliceIndex) Error 

func (err ErrInvalidSliceIndex) Error() string

func (ErrInvalidSliceIndex) KnownType 

func (t ErrInvalidSliceIndex) KnownType() []reflect.Type

type ErrInvalidSliceOperation 

type ErrInvalidSliceOperation struct {
	*SliceExpr
}

func (ErrInvalidSliceOperation) Error 

func (err ErrInvalidSliceOperation) Error() string

func (ErrInvalidSliceOperation) KnownType 

func (t ErrInvalidSliceOperation) KnownType() []reflect.Type

type ErrInvalidStructField 

type ErrInvalidStructField struct {
	Expr
}

func (ErrInvalidStructField) Error 

func (err ErrInvalidStructField) Error() string

type ErrInvalidTypeAssert 

type ErrInvalidTypeAssert struct {
	*TypeAssertExpr
}

func (ErrInvalidTypeAssert) Error 

func (err ErrInvalidTypeAssert) Error() string

func (ErrInvalidTypeAssert) KnownType 

func (t ErrInvalidTypeAssert) KnownType() []reflect.Type

type ErrInvalidUnaryOperation 

type ErrInvalidUnaryOperation struct {
	*UnaryExpr
}

func (ErrInvalidUnaryOperation) Const 

func (c ErrInvalidUnaryOperation) Const() reflect.Value

func (ErrInvalidUnaryOperation) Error 

func (err ErrInvalidUnaryOperation) Error() string

func (ErrInvalidUnaryOperation) IsConst 

func (c ErrInvalidUnaryOperation) IsConst() bool

func (ErrInvalidUnaryOperation) KnownType 

func (t ErrInvalidUnaryOperation) KnownType() []reflect.Type

type ErrMakeBadType 

type ErrMakeBadType struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrMakeBadType) Error 

func (err ErrMakeBadType) Error() string

type ErrMakeLenGtrThanCap 

type ErrMakeLenGtrThanCap struct {
	*CallExpr
	// contains filtered or unexported fields
}

func (ErrMakeLenGtrThanCap) Const 

func (c ErrMakeLenGtrThanCap) Const() reflect.Value

func (ErrMakeLenGtrThanCap) Error 

func (err ErrMakeLenGtrThanCap) Error() string

func (ErrMakeLenGtrThanCap) IsConst 

func (c ErrMakeLenGtrThanCap) IsConst() bool

func (ErrMakeLenGtrThanCap) KnownType 

func (t ErrMakeLenGtrThanCap) KnownType() []reflect.Type

type ErrMakeNonIntegerArg 

type ErrMakeNonIntegerArg struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrMakeNonIntegerArg) Error 

func (err ErrMakeNonIntegerArg) Error() string

type ErrMissingCompositeLitType 

type ErrMissingCompositeLitType struct {
	*CompositeLit
}

func (ErrMissingCompositeLitType) Error 

func (err ErrMissingCompositeLitType) Error() string

func (ErrMissingCompositeLitType) KnownType 

func (t ErrMissingCompositeLitType) KnownType() []reflect.Type

type ErrMissingMapKey 

type ErrMissingMapKey struct {
	Expr
}

func (ErrMissingMapKey) Error 

func (err ErrMissingMapKey) Error() string

type ErrMissingValue 

type ErrMissingValue struct {
	Expr
}

func (ErrMissingValue) Error 

func (err ErrMissingValue) Error() string

type ErrMixedStructValues 

type ErrMixedStructValues struct {
	Expr
}

func (ErrMixedStructValues) Error 

func (err ErrMixedStructValues) Error() string

type ErrMultiInSingleContext 

type ErrMultiInSingleContext struct {
	Expr
}

func (ErrMultiInSingleContext) Error 

func (err ErrMultiInSingleContext) Error() string

type ErrNoNewNamesInDeclaration 

type ErrNoNewNamesInDeclaration struct {
	*AssignStmt
}

func (ErrNoNewNamesInDeclaration) Error 

func (err ErrNoNewNamesInDeclaration) Error() string

type ErrNonBoolCondition 

type ErrNonBoolCondition struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrNonBoolCondition) Error 

func (err ErrNonBoolCondition) Error() string

type ErrNonIntegerIndex 

type ErrNonIntegerIndex struct {
	Expr
}

func (ErrNonIntegerIndex) Error 

func (err ErrNonIntegerIndex) Error() string

type ErrNonInterfaceTypeSwitch 

type ErrNonInterfaceTypeSwitch struct {
	Expr
}

func (ErrNonInterfaceTypeSwitch) Error 

func (err ErrNonInterfaceTypeSwitch) Error() string

type ErrNonNameInDeclaration 

type ErrNonNameInDeclaration struct {
	Expr
}

func (ErrNonNameInDeclaration) Error 

func (err ErrNonNameInDeclaration) Error() string

type ErrOverflowedConstant 

type ErrOverflowedConstant struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrOverflowedConstant) Error 

func (err ErrOverflowedConstant) Error() string

type ErrStupidShift 

type ErrStupidShift struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrStupidShift) Error 

func (err ErrStupidShift) Error() string

type ErrTruncatedConstant 

type ErrTruncatedConstant struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrTruncatedConstant) Error 

func (err ErrTruncatedConstant) Error() string

type ErrTypeUsedAsExpression 

type ErrTypeUsedAsExpression struct {
	Expr
}

func (ErrTypeUsedAsExpression) Error 

func (err ErrTypeUsedAsExpression) Error() string

type ErrUnaddressableSliceOperand 

type ErrUnaddressableSliceOperand struct {
	*SliceExpr
}

func (ErrUnaddressableSliceOperand) Error 

func (err ErrUnaddressableSliceOperand) Error() string

func (ErrUnaddressableSliceOperand) KnownType 

func (t ErrUnaddressableSliceOperand) KnownType() []reflect.Type

type ErrUncomparableMapKey 

type ErrUncomparableMapKey struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrUncomparableMapKey) Error 

func (err ErrUncomparableMapKey) Error() string

type ErrUndefined 

type ErrUndefined struct {
	Expr
}

func (ErrUndefined) Error 

func (err ErrUndefined) Error() string

type ErrUndefinedFieldOrMethod 

type ErrUndefinedFieldOrMethod struct {
	Expr
}

func (ErrUndefinedFieldOrMethod) Error 

func (err ErrUndefinedFieldOrMethod) Error() string

type ErrUnknownStructField 

type ErrUnknownStructField struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrUnknownStructField) Error 

func (err ErrUnknownStructField) Error() string

type ErrUntypedNil 

type ErrUntypedNil struct {
	Expr
}

func (ErrUntypedNil) Error 

func (ErrUntypedNil) Error() string

type ErrWrongArgType 

type ErrWrongArgType struct {
	Expr
	// contains filtered or unexported fields
}

func (ErrWrongArgType) Error 

func (err ErrWrongArgType) Error() string

type ErrWrongNumberOfArgs 

type ErrWrongNumberOfArgs struct {
	*CallExpr
	// contains filtered or unexported fields
}

func (ErrWrongNumberOfArgs) Const 

func (c ErrWrongNumberOfArgs) Const() reflect.Value

func (ErrWrongNumberOfArgs) Error 

func (err ErrWrongNumberOfArgs) Error() string

func (ErrWrongNumberOfArgs) IsConst 

func (c ErrWrongNumberOfArgs) IsConst() bool

func (ErrWrongNumberOfArgs) KnownType 

func (t ErrWrongNumberOfArgs) KnownType() []reflect.Type

type ErrWrongNumberOfReturnValues 

type ErrWrongNumberOfReturnValues struct {
	*ReturnStmt
	// contains filtered or unexported fields
}

func (ErrWrongNumberOfReturnValues) Error 

func (err ErrWrongNumberOfReturnValues) Error() string

type ErrWrongNumberOfStructValues 

type ErrWrongNumberOfStructValues struct {
	*CompositeLit
}

func (ErrWrongNumberOfStructValues) Error 

func (err ErrWrongNumberOfStructValues) Error() string

func (ErrWrongNumberOfStructValues) KnownType 

func (t ErrWrongNumberOfStructValues) KnownType() []reflect.Type

type Expr 

type Expr interface {
	ast.Expr

	// The type of this expression if known. Certain expr types have special interpretations
	// Constant expr: a ConstType will be returned if constant is untyped
	// Ellipsis expr: a single reflect.Type represents the type of all unpacked values
	KnownType() []reflect.Type

	// Returns true if this expression evaluates to a constant. In this
	// case, Value() will return the evalutated constant. Nodes below
	// this expression can be ignored.
	IsConst() bool

	// Returns the const value, if known.
	Const() reflect.Value

	// String() matches the print format of expressions in go errors
	String() string
	// contains filtered or unexported methods
}

Annotated ast.Expr nodes

func CheckExpr 

func CheckExpr(expr ast.Expr, env Env) (Expr, []error)

Type check an ast.Expr to produce an Expr. Errors are accumulated and returned as a single slice. When evaluating constant expressions, non fatal truncation/overflow errors may be raised but type checking will continue. A common pattern to detect errors is 

if expr, errs := CheckExpr(...); errs != nil && !expr.IsConst() {
  fatal
}

if expr.IsConst() is true, then the resulting Expr has been successfully checked, regardless of if errors are present.

type ExprStmt 

type ExprStmt struct {
	*ast.ExprStmt
	X Expr
}

type Field 

type Field struct {
	*ast.Field
	Names []*Ident
	Type  Expr
	// contains filtered or unexported fields
}

func (Field) KnownType 

func (t Field) KnownType() []reflect.Type

type FieldList 

type FieldList struct {
	*ast.FieldList
	List []*Field
}

type ForStmt 

type ForStmt struct {
	*ast.ForStmt
	Init Stmt
	Cond Expr
	Post Stmt
	Body *BlockStmt
	// contains filtered or unexported fields
}

type FuncLit 

type FuncLit struct {
	*ast.FuncLit
	Type *FuncType
	Body *BlockStmt
	// contains filtered or unexported fields
}

func (*FuncLit) Const 

func (*FuncLit) Const() reflect.Value

func (*FuncLit) IsConst 

func (*FuncLit) IsConst() bool

func (FuncLit) KnownType 

func (t FuncLit) KnownType() []reflect.Type

func (*FuncLit) String 

func (funcLit *FuncLit) String() string

type FuncType 

type FuncType struct {
	*ast.FuncType
	Params  *FieldList
	Results *FieldList
	// contains filtered or unexported fields
}

func (*FuncType) Const 

func (*FuncType) Const() reflect.Value

func (*FuncType) IsConst 

func (*FuncType) IsConst() bool

func (FuncType) KnownType 

func (t FuncType) KnownType() []reflect.Type

func (*FuncType) String 

func (funcType *FuncType) String() string

type Ident 

type Ident struct {
	*ast.Ident
	// contains filtered or unexported fields
}

func (Ident) Const 

func (c Ident) Const() reflect.Value

func (Ident) IsConst 

func (c Ident) IsConst() bool

func (Ident) KnownType 

func (t Ident) KnownType() []reflect.Type

func (*Ident) String 

func (ident *Ident) String() string

type IfStmt 

type IfStmt struct {
	*ast.IfStmt
	Init Stmt
	Cond Expr
	Body *BlockStmt
	Else Stmt
}

type IndexExpr 

type IndexExpr struct {
	*ast.IndexExpr
	X     Expr
	Index Expr
	// contains filtered or unexported fields
}

func (*IndexExpr) Const 

func (*IndexExpr) Const() reflect.Value

func (*IndexExpr) IsConst 

func (*IndexExpr) IsConst() bool

func (IndexExpr) KnownType 

func (t IndexExpr) KnownType() []reflect.Type

func (*IndexExpr) String 

func (index *IndexExpr) String() string

type InterfaceType 

type InterfaceType struct {
	*ast.InterfaceType
	// contains filtered or unexported fields
}

func (*InterfaceType) Const 

func (*InterfaceType) Const() reflect.Value

func (*InterfaceType) IsConst 

func (*InterfaceType) IsConst() bool

func (InterfaceType) KnownType 

func (t InterfaceType) KnownType() []reflect.Type

func (*InterfaceType) String 

func (interfaceType *InterfaceType) String() string

type KeyValueExpr 

type KeyValueExpr struct {
	*ast.KeyValueExpr
	Key   Expr
	Value Expr
}

func (*KeyValueExpr) Const 

func (*KeyValueExpr) Const() reflect.Value

func (*KeyValueExpr) IsConst 

func (*KeyValueExpr) IsConst() bool

func (*KeyValueExpr) KnownType 

func (*KeyValueExpr) KnownType() []reflect.Type

func (*KeyValueExpr) String 

func (keyValueExpr *KeyValueExpr) String() string

type LabeledStmt 

type LabeledStmt struct {
	*ast.LabeledStmt
	Label *Ident
	Stmt  Stmt
}

type MapType 

type MapType struct {
	*ast.MapType
	Key   Expr
	Value Expr
	// contains filtered or unexported fields
}

func (*MapType) Const 

func (*MapType) Const() reflect.Value

func (*MapType) IsConst 

func (*MapType) IsConst() bool

func (MapType) KnownType 

func (t MapType) KnownType() []reflect.Type

func (*MapType) String 

func (mapType *MapType) String() string

type PanicDivideByZero 

type PanicDivideByZero struct{}

func (PanicDivideByZero) Error 

func (err PanicDivideByZero) Error() string

type PanicIndexOutOfBounds 

type PanicIndexOutOfBounds struct{}

func (PanicIndexOutOfBounds) Error 

func (err PanicIndexOutOfBounds) Error() string

type PanicInterfaceConversion 

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

func (PanicInterfaceConversion) Error 

func (err PanicInterfaceConversion) Error() string

type PanicInvalidDereference 

type PanicInvalidDereference struct{}

func (PanicInvalidDereference) Error 

func (err PanicInvalidDereference) Error() string

type PanicSliceOutOfBounds 

type PanicSliceOutOfBounds struct{}

func (PanicSliceOutOfBounds) Error 

func (err PanicSliceOutOfBounds) Error() string

type PanicUncomparableType 

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

func (PanicUncomparableType) Error 

func (err PanicUncomparableType) Error() string

type PanicUnhashableType 

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

func (PanicUnhashableType) Error 

func (err PanicUnhashableType) Error() string

type PanicUser 

type PanicUser reflect.Value

func (PanicUser) Error 

func (p PanicUser) Error() string

type ParenExpr 

type ParenExpr struct {
	*ast.ParenExpr
	X Expr
	// contains filtered or unexported fields
}

func (ParenExpr) Const 

func (c ParenExpr) Const() reflect.Value

func (ParenExpr) IsConst 

func (c ParenExpr) IsConst() bool

func (ParenExpr) KnownType 

func (t ParenExpr) KnownType() []reflect.Type

func (*ParenExpr) String 

func (parenExpr *ParenExpr) String() string

type ReturnStmt 

type ReturnStmt struct {
	*ast.ReturnStmt
	Results []Expr
}

type Rune 

type Rune struct {
	reflect.Type
}

func (Rune) Name 

func (Rune) Name() string

func (Rune) String 

func (Rune) String() string

type SelectorExpr 

type SelectorExpr struct {
	*ast.SelectorExpr
	X   Expr
	Sel *Ident
	// contains filtered or unexported fields
}

func (SelectorExpr) Const 

func (c SelectorExpr) Const() reflect.Value

func (SelectorExpr) IsConst 

func (c SelectorExpr) IsConst() bool

func (SelectorExpr) KnownType 

func (t SelectorExpr) KnownType() []reflect.Type

func (*SelectorExpr) String 

func (selectorExpr *SelectorExpr) String() string

type SimpleEnv 

type SimpleEnv struct {
	// path relative to GOROOT or GOPATH. e.g. github.com/0xfaded/eval
	Path   string
	Parent *SimpleEnv
	Vars   map[string]reflect.Value
	Funcs  map[string]reflect.Value
	Consts map[string]reflect.Value
	Types  map[string]reflect.Type
	Pkgs   map[string]Env
}

func MakeSimpleEnv 

func MakeSimpleEnv() *SimpleEnv

func (*SimpleEnv) AddConst 

func (env *SimpleEnv) AddConst(ident string, c reflect.Value)

func (*SimpleEnv) AddFunc 

func (env *SimpleEnv) AddFunc(ident string, f reflect.Value)

func (*SimpleEnv) AddPkg 

func (env *SimpleEnv) AddPkg(pkg string, p Env)

func (*SimpleEnv) AddType 

func (env *SimpleEnv) AddType(ident string, t reflect.Type)

func (*SimpleEnv) AddVar 

func (env *SimpleEnv) AddVar(ident string, v reflect.Value)

func (*SimpleEnv) Const 

func (env *SimpleEnv) Const(ident string) reflect.Value

func (*SimpleEnv) Func 

func (env *SimpleEnv) Func(ident string) reflect.Value

func (*SimpleEnv) Pkg 

func (env *SimpleEnv) Pkg(pkg string) Env

func (*SimpleEnv) PopScope 

func (env *SimpleEnv) PopScope() Env

func (*SimpleEnv) PushScope 

func (env *SimpleEnv) PushScope() Env

func (*SimpleEnv) Type 

func (env *SimpleEnv) Type(ident string) reflect.Type

func (*SimpleEnv) Var 

func (env *SimpleEnv) Var(ident string) reflect.Value

type SliceExpr 

type SliceExpr struct {
	*ast.SliceExpr
	X    Expr
	Low  Expr
	High Expr
	// contains filtered or unexported fields
}

func (*SliceExpr) Const 

func (*SliceExpr) Const() reflect.Value

func (*SliceExpr) IsConst 

func (*SliceExpr) IsConst() bool

func (SliceExpr) KnownType 

func (t SliceExpr) KnownType() []reflect.Type

func (*SliceExpr) String 

func (slice *SliceExpr) String() string

type StarExpr 

type StarExpr struct {
	*ast.StarExpr
	X Expr
	// contains filtered or unexported fields
}

func (*StarExpr) Const 

func (*StarExpr) Const() reflect.Value

func (*StarExpr) IsConst 

func (*StarExpr) IsConst() bool

func (StarExpr) KnownType 

func (t StarExpr) KnownType() []reflect.Type

func (*StarExpr) String 

func (star *StarExpr) String() string

type State 

type State struct {
	Last Stmt
	Env  Env
}

func InterpStmt 

func InterpStmt(stmt Stmt, env Env) (last *State, err error)

type Stmt 

type Stmt interface {
	ast.Stmt
}

Annotated ast.Stmt nodes

func CheckStmt 

func CheckStmt(stmt ast.Stmt, env Env) (Stmt, []error)

Place holder for something more substantial

type StructType 

type StructType struct {
	*ast.StructType
	// contains filtered or unexported fields
}

func (*StructType) Const 

func (*StructType) Const() reflect.Value

func (*StructType) IsConst 

func (*StructType) IsConst() bool

func (StructType) KnownType 

func (t StructType) KnownType() []reflect.Type

func (*StructType) String 

func (structType *StructType) String() string

type SwitchStmt 

type SwitchStmt struct {
	*ast.SwitchStmt
	Init Stmt
	Tag  Expr
	Body *BlockStmt
	// contains filtered or unexported fields
}

type TypeAssertExpr 

type TypeAssertExpr struct {
	*ast.TypeAssertExpr
	X    Expr
	Type Expr
	// contains filtered or unexported fields
}

func (*TypeAssertExpr) Const 

func (*TypeAssertExpr) Const() reflect.Value

func (*TypeAssertExpr) IsConst 

func (*TypeAssertExpr) IsConst() bool

func (TypeAssertExpr) KnownType 

func (t TypeAssertExpr) KnownType() []reflect.Type

func (*TypeAssertExpr) String 

func (assert *TypeAssertExpr) String() string

type TypeSwitchStmt 

type TypeSwitchStmt struct {
	*ast.TypeSwitchStmt
	Init   Stmt
	Assign Stmt
	Body   *BlockStmt
	// contains filtered or unexported fields
}

func (*TypeSwitchStmt) Name 

func (typeswitch *TypeSwitchStmt) Name() string

func (*TypeSwitchStmt) Tag 

func (typeswitch *TypeSwitchStmt) Tag() Expr

type UnaryExpr 

type UnaryExpr struct {
	*ast.UnaryExpr
	X Expr
	// contains filtered or unexported fields
}

func (UnaryExpr) Const 

func (c UnaryExpr) Const() reflect.Value

func (UnaryExpr) IsConst 

func (c UnaryExpr) IsConst() bool

func (UnaryExpr) KnownType 

func (t UnaryExpr) KnownType() []reflect.Type

func (*UnaryExpr) String 

func (unary *UnaryExpr) String() string

type UntypedNil 

type UntypedNil struct{}

func (UntypedNil) String 

func (UntypedNil) String() string

Source Files

View all Source files

Directories

Path Synopsis
Example repl is a simple REPL (read-eval-print loop) for GO using http://github.com/0xfaded/eval to the heavy lifting to implement the eval() part.
 Example repl is a simple REPL (read-eval-print loop) for GO using http://github.com/0xfaded/eval to the heavy lifting to implement the eval() part.

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