package cty import ( "fmt" "math/big" "reflect" "github.com/zclconf/go-cty/cty/set" ) func (val Value) GoString() string { if val == NilVal { return "cty.NilVal" } if val.ty == DynamicPseudoType { return "cty.DynamicValue" } if !val.IsKnown() { return fmt.Sprintf("cty.Unknown(%#v)", val.ty) } if val.IsNull() { return fmt.Sprintf("cty.Null(%#v)", val.ty) } // By the time we reach here we've dealt with all of the exceptions around // unknowns and nulls, so we're guaranteed that the values are the // canonical internal representation of the given type. switch val.ty { case Bool: if val.v.(bool) { return "cty.True" } else { return "cty.False" } case Number: fv := val.v.(*big.Float) // We'll try to use NumberIntVal or NumberFloatVal if we can, since // the fully-general initializer call is pretty ugly-looking. if fv.IsInt() { return fmt.Sprintf("cty.NumberIntVal(%#v)", fv) } if rfv, accuracy := fv.Float64(); accuracy == big.Exact { return fmt.Sprintf("cty.NumberFloatVal(%#v)", rfv) } return fmt.Sprintf("cty.NumberVal(new(big.Float).Parse(\"%#v\", 10))", fv) case String: return fmt.Sprintf("cty.StringVal(%#v)", val.v) } switch { case val.ty.IsSetType(): vals := val.v.(set.Set).Values() if vals == nil || len(vals) == 0 { return fmt.Sprintf("cty.SetValEmpty()") } else { return fmt.Sprintf("cty.SetVal(%#v)", vals) } case val.ty.IsCapsuleType(): return fmt.Sprintf("cty.CapsuleVal(%#v, %#v)", val.ty, val.v) } // Default exposes implementation details, so should actually cover // all of the cases above for good caller UX. return fmt.Sprintf("cty.Value{ty: %#v, v: %#v}", val.ty, val.v) } // Equals returns True if the receiver and the given other value have the // same type and are exactly equal in value. // // The usual short-circuit rules apply, so the result can be unknown or typed // as dynamic if either of the given values are. Use RawEquals to compare // if two values are equal *ignoring* the short-circuit rules. func (val Value) Equals(other Value) Value { if val.ty.HasDynamicTypes() || other.ty.HasDynamicTypes() { return UnknownVal(Bool) } if !val.ty.Equals(other.ty) { return BoolVal(false) } if !(val.IsKnown() && other.IsKnown()) { return UnknownVal(Bool) } if val.IsNull() || other.IsNull() { if val.IsNull() && other.IsNull() { return BoolVal(true) } return BoolVal(false) } ty := val.ty result := false switch { case ty == Number: result = val.v.(*big.Float).Cmp(other.v.(*big.Float)) == 0 case ty == Bool: result = val.v.(bool) == other.v.(bool) case ty == String: // Simple equality is safe because we NFC-normalize strings as they // enter our world from StringVal, and so we can assume strings are // always in normal form. result = val.v.(string) == other.v.(string) case ty.IsObjectType(): oty := ty.typeImpl.(typeObject) result = true for attr, aty := range oty.AttrTypes { lhs := Value{ ty: aty, v: val.v.(map[string]interface{})[attr], } rhs := Value{ ty: aty, v: other.v.(map[string]interface{})[attr], } eq := lhs.Equals(rhs) if !eq.IsKnown() { return UnknownVal(Bool) } if eq.False() { result = false break } } case ty.IsTupleType(): tty := ty.typeImpl.(typeTuple) result = true for i, ety := range tty.ElemTypes { lhs := Value{ ty: ety, v: val.v.([]interface{})[i], } rhs := Value{ ty: ety, v: other.v.([]interface{})[i], } eq := lhs.Equals(rhs) if !eq.IsKnown() { return UnknownVal(Bool) } if eq.False() { result = false break } } case ty.IsListType(): ety := ty.typeImpl.(typeList).ElementTypeT if len(val.v.([]interface{})) == len(other.v.([]interface{})) { result = true for i := range val.v.([]interface{}) { lhs := Value{ ty: ety, v: val.v.([]interface{})[i], } rhs := Value{ ty: ety, v: other.v.([]interface{})[i], } eq := lhs.Equals(rhs) if !eq.IsKnown() { return UnknownVal(Bool) } if eq.False() { result = false break } } } case ty.IsSetType(): s1 := val.v.(set.Set) s2 := other.v.(set.Set) equal := true // Note that by our definition of sets it's never possible for two // sets that contain unknown values (directly or indicrectly) to // ever be equal, even if they are otherwise identical. // FIXME: iterating both lists and checking each item is not the // ideal implementation here, but it works with the primitives we // have in the set implementation. Perhaps the set implementation // can provide its own equality test later. s1.EachValue(func(v interface{}) { if !s2.Has(v) { equal = false } }) s2.EachValue(func(v interface{}) { if !s1.Has(v) { equal = false } }) result = equal case ty.IsMapType(): ety := ty.typeImpl.(typeMap).ElementTypeT if len(val.v.(map[string]interface{})) == len(other.v.(map[string]interface{})) { result = true for k := range val.v.(map[string]interface{}) { if _, ok := other.v.(map[string]interface{})[k]; !ok { result = false break } lhs := Value{ ty: ety, v: val.v.(map[string]interface{})[k], } rhs := Value{ ty: ety, v: other.v.(map[string]interface{})[k], } eq := lhs.Equals(rhs) if !eq.IsKnown() { return UnknownVal(Bool) } if eq.False() { result = false break } } } case ty.IsCapsuleType(): // A capsule type's encapsulated value is a pointer to a value of its // native type, so we can just compare these to get the identity test // we need. return BoolVal(val.v == other.v) default: // should never happen panic(fmt.Errorf("unsupported value type %#v in Equals", ty)) } return BoolVal(result) } // NotEqual is a shorthand for Equals followed by Not. func (val Value) NotEqual(other Value) Value { return val.Equals(other).Not() } // True returns true if the receiver is True, false if False, and panics if // the receiver is not of type Bool. // // This is a helper function to help write application logic that works with // values, rather than a first-class operation. It does not work with unknown // or null values. For more robust handling with unknown value // short-circuiting, use val.Equals(cty.True). func (val Value) True() bool { if val.ty != Bool { panic("not bool") } return val.Equals(True).v.(bool) } // False is the opposite of True. func (val Value) False() bool { return !val.True() } // RawEquals returns true if and only if the two given values have the same // type and equal value, ignoring the usual short-circuit rules about // unknowns and dynamic types. // // This method is more appropriate for testing than for real use, since it // skips over usual semantics around unknowns but as a consequence allows // testing the result of another operation that is expected to return unknown. // It returns a primitive Go bool rather than a Value to remind us that it // is not a first-class value operation. func (val Value) RawEquals(other Value) bool { if !val.ty.Equals(other.ty) { return false } if (!val.IsKnown()) && (!other.IsKnown()) { return true } if (val.IsKnown() && !other.IsKnown()) || (other.IsKnown() && !val.IsKnown()) { return false } if val.IsNull() && other.IsNull() { return true } if (val.IsNull() && !other.IsNull()) || (other.IsNull() && !val.IsNull()) { return false } if val.ty == DynamicPseudoType && other.ty == DynamicPseudoType { return true } ty := val.ty switch { case ty == Number || ty == Bool || ty == String || ty == DynamicPseudoType: return val.Equals(other).True() case ty.IsObjectType(): oty := ty.typeImpl.(typeObject) for attr, aty := range oty.AttrTypes { lhs := Value{ ty: aty, v: val.v.(map[string]interface{})[attr], } rhs := Value{ ty: aty, v: other.v.(map[string]interface{})[attr], } eq := lhs.RawEquals(rhs) if !eq { return false } } return true case ty.IsTupleType(): tty := ty.typeImpl.(typeTuple) for i, ety := range tty.ElemTypes { lhs := Value{ ty: ety, v: val.v.([]interface{})[i], } rhs := Value{ ty: ety, v: other.v.([]interface{})[i], } eq := lhs.RawEquals(rhs) if !eq { return false } } return true case ty.IsListType(): ety := ty.typeImpl.(typeList).ElementTypeT if len(val.v.([]interface{})) == len(other.v.([]interface{})) { for i := range val.v.([]interface{}) { lhs := Value{ ty: ety, v: val.v.([]interface{})[i], } rhs := Value{ ty: ety, v: other.v.([]interface{})[i], } eq := lhs.RawEquals(rhs) if !eq { return false } } return true } return false case ty.IsSetType(): s1 := val.v.(set.Set) s2 := other.v.(set.Set) // Since we're intentionally ignoring our rule that two unknowns // are never equal, we can cheat here. // (This isn't 100% right since e.g. it will fail if the set contains // numbers that are infinite, which DeepEqual can't compare properly. // We're accepting that limitation for simplicity here, since this // function is here primarily for testing.) return reflect.DeepEqual(s1, s2) case ty.IsMapType(): ety := ty.typeImpl.(typeMap).ElementTypeT if len(val.v.(map[string]interface{})) == len(other.v.(map[string]interface{})) { for k := range val.v.(map[string]interface{}) { if _, ok := other.v.(map[string]interface{})[k]; !ok { return false } lhs := Value{ ty: ety, v: val.v.(map[string]interface{})[k], } rhs := Value{ ty: ety, v: other.v.(map[string]interface{})[k], } eq := lhs.RawEquals(rhs) if !eq { return false } } return true } return false case ty.IsCapsuleType(): // A capsule type's encapsulated value is a pointer to a value of its // native type, so we can just compare these to get the identity test // we need. return val.v == other.v default: // should never happen panic(fmt.Errorf("unsupported value type %#v in RawEquals", ty)) } } // Add returns the sum of the receiver and the given other value. Both values // must be numbers; this method will panic if not. func (val Value) Add(other Value) Value { if shortCircuit := mustTypeCheck(Number, Number, val, other); shortCircuit != nil { shortCircuit = forceShortCircuitType(shortCircuit, Number) return *shortCircuit } ret := new(big.Float) ret.Add(val.v.(*big.Float), other.v.(*big.Float)) return NumberVal(ret) } // Subtract returns receiver minus the given other value. Both values must be // numbers; this method will panic if not. func (val Value) Subtract(other Value) Value { if shortCircuit := mustTypeCheck(Number, Number, val, other); shortCircuit != nil { shortCircuit = forceShortCircuitType(shortCircuit, Number) return *shortCircuit } return val.Add(other.Negate()) } // Negate returns the numeric negative of the receiver, which must be a number. // This method will panic when given a value of any other type. func (val Value) Negate() Value { if shortCircuit := mustTypeCheck(Number, Number, val); shortCircuit != nil { shortCircuit = forceShortCircuitType(shortCircuit, Number) return *shortCircuit } ret := new(big.Float).Neg(val.v.(*big.Float)) return NumberVal(ret) } // Multiply returns the product of the receiver and the given other value. // Both values must be numbers; this method will panic if not. func (val Value) Multiply(other Value) Value { if shortCircuit := mustTypeCheck(Number, Number, val, other); shortCircuit != nil { shortCircuit = forceShortCircuitType(shortCircuit, Number) return *shortCircuit } ret := new(big.Float) ret.Mul(val.v.(*big.Float), other.v.(*big.Float)) return NumberVal(ret) } // Divide returns the quotient of the receiver and the given other value. // Both values must be numbers; this method will panic if not. // // If the "other" value is exactly zero, this operation will return either // PositiveInfinity or NegativeInfinity, depending on the sign of the // receiver value. For some use-cases the presence of infinities may be // undesirable, in which case the caller should check whether the // other value equals zero before calling and raise an error instead. // // If both values are zero or infinity, this function will panic with // an instance of big.ErrNaN. func (val Value) Divide(other Value) Value { if shortCircuit := mustTypeCheck(Number, Number, val, other); shortCircuit != nil { shortCircuit = forceShortCircuitType(shortCircuit, Number) return *shortCircuit } ret := new(big.Float) ret.Quo(val.v.(*big.Float), other.v.(*big.Float)) return NumberVal(ret) } // Modulo returns the remainder of an integer division of the receiver and // the given other value. Both values must be numbers; this method will panic // if not. // // If the "other" value is exactly zero, this operation will return either // PositiveInfinity or NegativeInfinity, depending on the sign of the // receiver value. For some use-cases the presence of infinities may be // undesirable, in which case the caller should check whether the // other value equals zero before calling and raise an error instead. // // This operation is primarily here for use with nonzero natural numbers. // Modulo with "other" as a non-natural number gets somewhat philosophical, // and this function takes a position on what that should mean, but callers // may wish to disallow such things outright or implement their own modulo // if they disagree with the interpretation used here. func (val Value) Modulo(other Value) Value { if shortCircuit := mustTypeCheck(Number, Number, val, other); shortCircuit != nil { shortCircuit = forceShortCircuitType(shortCircuit, Number) return *shortCircuit } // We cheat a bit here with infinities, just abusing the Multiply operation // to get an infinite result of the correct sign. if val == PositiveInfinity || val == NegativeInfinity || other == PositiveInfinity || other == NegativeInfinity { return val.Multiply(other) } if other.RawEquals(Zero) { return val } // FIXME: This is a bit clumsy. Should come back later and see if there's a // more straightforward way to do this. rat := val.Divide(other) ratFloorInt := &big.Int{} rat.v.(*big.Float).Int(ratFloorInt) work := (&big.Float{}).SetInt(ratFloorInt) work.Mul(other.v.(*big.Float), work) work.Sub(val.v.(*big.Float), work) return NumberVal(work) } // Absolute returns the absolute (signless) value of the receiver, which must // be a number or this method will panic. func (val Value) Absolute() Value { if shortCircuit := mustTypeCheck(Number, Number, val); shortCircuit != nil { shortCircuit = forceShortCircuitType(shortCircuit, Number) return *shortCircuit } ret := (&big.Float{}).Abs(val.v.(*big.Float)) return NumberVal(ret) } // GetAttr returns the value of the given attribute of the receiver, which // must be of an object type that has an attribute of the given name. // This method will panic if the receiver type is not compatible. // // The method will also panic if the given attribute name is not defined // for the value's type. Use the attribute-related methods on Type to // check for the validity of an attribute before trying to use it. // // This method may be called on a value whose type is DynamicPseudoType, // in which case the result will also be DynamicVal. func (val Value) GetAttr(name string) Value { if val.ty == DynamicPseudoType { return DynamicVal } if !val.ty.IsObjectType() { panic("value is not an object") } if !val.ty.HasAttribute(name) { panic("value has no attribute of that name") } attrType := val.ty.AttributeType(name) if !val.IsKnown() { return UnknownVal(attrType) } return Value{ ty: attrType, v: val.v.(map[string]interface{})[name], } } // Index returns the value of an element of the receiver, which must have // either a list, map or tuple type. This method will panic if the receiver // type is not compatible. // // The key value must be the correct type for the receving collection: a // number if the collection is a list or tuple, or a string if it is a map. // In the case of a list or tuple, the given number must be convertable to int // or this method will panic. The key may alternatively be of // DynamicPseudoType, in which case the result itself is an unknown of the // collection's element type. // // The result is of the receiver collection's element type, or in the case // of a tuple the type of the specific element index requested. // // This method may be called on a value whose type is DynamicPseudoType, // in which case the result will also be the DynamicValue. func (val Value) Index(key Value) Value { if val.ty == DynamicPseudoType { return DynamicVal } switch { case val.Type().IsListType(): elty := val.Type().ElementType() if key.Type() == DynamicPseudoType { return UnknownVal(elty) } if key.Type() != Number { panic("element key for list must be number") } if !key.IsKnown() { return UnknownVal(elty) } if !val.IsKnown() { return UnknownVal(elty) } index, accuracy := key.v.(*big.Float).Int64() if accuracy != big.Exact || index < 0 { panic("element key for list must be non-negative integer") } return Value{ ty: elty, v: val.v.([]interface{})[index], } case val.Type().IsMapType(): elty := val.Type().ElementType() if key.Type() == DynamicPseudoType { return UnknownVal(elty) } if key.Type() != String { panic("element key for map must be string") } if !key.IsKnown() { return UnknownVal(elty) } if !val.IsKnown() { return UnknownVal(elty) } keyStr := key.v.(string) return Value{ ty: elty, v: val.v.(map[string]interface{})[keyStr], } case val.Type().IsTupleType(): if key.Type() == DynamicPseudoType { return DynamicVal } if key.Type() != Number { panic("element key for tuple must be number") } if !key.IsKnown() { return DynamicVal } index, accuracy := key.v.(*big.Float).Int64() if accuracy != big.Exact || index < 0 { panic("element key for list must be non-negative integer") } eltys := val.Type().TupleElementTypes() if !val.IsKnown() { return UnknownVal(eltys[index]) } return Value{ ty: eltys[index], v: val.v.([]interface{})[index], } default: panic("not a list, map, or tuple type") } } // HasIndex returns True if the receiver (which must be supported for Index) // has an element with the given index key, or False if it does not. // // The result will be UnknownVal(Bool) if either the collection or the // key value are unknown. // // This method will panic if the receiver is not indexable, but does not // impose any panic-causing type constraints on the key. func (val Value) HasIndex(key Value) Value { if val.ty == DynamicPseudoType { return UnknownVal(Bool) } switch { case val.Type().IsListType(): if key.Type() == DynamicPseudoType { return UnknownVal(Bool) } if key.Type() != Number { return False } if !key.IsKnown() { return UnknownVal(Bool) } if !val.IsKnown() { return UnknownVal(Bool) } index, accuracy := key.v.(*big.Float).Int64() if accuracy != big.Exact || index < 0 { return False } return BoolVal(int(index) < len(val.v.([]interface{})) && index >= 0) case val.Type().IsMapType(): if key.Type() == DynamicPseudoType { return UnknownVal(Bool) } if key.Type() != String { return False } if !key.IsKnown() { return UnknownVal(Bool) } if !val.IsKnown() { return UnknownVal(Bool) } keyStr := key.v.(string) _, exists := val.v.(map[string]interface{})[keyStr] return BoolVal(exists) case val.Type().IsTupleType(): if key.Type() == DynamicPseudoType { return UnknownVal(Bool) } if key.Type() != Number { return False } if !key.IsKnown() { return UnknownVal(Bool) } index, accuracy := key.v.(*big.Float).Int64() if accuracy != big.Exact || index < 0 { return False } length := val.Type().Length() return BoolVal(int(index) < length && index >= 0) default: panic("not a list, map, or tuple type") } } // HasElement returns True if the receiver (which must be of a set type) // has the given value as an element, or False if it does not. // // The result will be UnknownVal(Bool) if either the set or the // given value are unknown. // // This method will panic if the receiver is not a set, or if it is a null set. func (val Value) HasElement(elem Value) Value { ty := val.Type() if !ty.IsSetType() { panic("not a set type") } if !val.IsKnown() || !elem.IsKnown() { return UnknownVal(Bool) } if val.IsNull() { panic("can't call HasElement on a nil value") } s := val.v.(set.Set) return BoolVal(s.Has(elem.v)) } // Length returns the length of the receiver, which must be a collection type // or tuple type, as a number value. If the receiver is not a compatible type // then this method will panic. // // If the receiver is unknown then the result is also unknown. // // If the receiver is null then this function will panic. // // Note that Length is not supported for strings. To determine the length // of a string, call AsString and take the length of the native Go string // that is returned. func (val Value) Length() Value { if val.Type().IsTupleType() { // For tuples, we can return the length even if the value is not known. return NumberIntVal(int64(val.Type().Length())) } if !val.IsKnown() { return UnknownVal(Number) } return NumberIntVal(int64(val.LengthInt())) } // LengthInt is like Length except it returns an int. It has the same behavior // as Length except that it will panic if the receiver is unknown. // // This is an integration method provided for the convenience of code bridging // into Go's type system. func (val Value) LengthInt() int { if val.Type().IsTupleType() { // For tuples, we can return the length even if the value is not known. return val.Type().Length() } if !val.IsKnown() { panic("value is not known") } if val.IsNull() { panic("value is null") } switch { case val.ty.IsListType(): return len(val.v.([]interface{})) case val.ty.IsSetType(): return val.v.(set.Set).Length() case val.ty.IsMapType(): return len(val.v.(map[string]interface{})) default: panic("value is not a collection") } } // ElementIterator returns an ElementIterator for iterating the elements // of the receiver, which must be a collection type, a tuple type, or an object // type. If called on a method of any other type, this method will panic. // // The value must be Known and non-Null, or this method will panic. // // If the receiver is of a list type, the returned keys will be of type Number // and the values will be of the list's element type. // // If the receiver is of a map type, the returned keys will be of type String // and the value will be of the map's element type. Elements are passed in // ascending lexicographical order by key. // // If the receiver is of a set type, each element is returned as both the // key and the value, since set members are their own identity. // // If the receiver is of a tuple type, the returned keys will be of type Number // and the value will be of the corresponding element's type. // // If the receiver is of an object type, the returned keys will be of type // String and the value will be of the corresponding attributes's type. // // ElementIterator is an integration method, so it cannot handle Unknown // values. This method will panic if the receiver is Unknown. func (val Value) ElementIterator() ElementIterator { if !val.IsKnown() { panic("can't use ElementIterator on unknown value") } if val.IsNull() { panic("can't use ElementIterator on null value") } return elementIterator(val) } // CanIterateElements returns true if the receiver can support the // ElementIterator method (and by extension, ForEachElement) without panic. func (val Value) CanIterateElements() bool { return canElementIterator(val) } // ForEachElement executes a given callback function for each element of // the receiver, which must be a collection type or tuple type, or this method // will panic. // // ForEachElement uses ElementIterator internally, and so the values passed // to the callback are as described for ElementIterator. // // Returns true if the iteration exited early due to the callback function // returning true, or false if the loop ran to completion. // // ForEachElement is an integration method, so it cannot handle Unknown // values. This method will panic if the receiver is Unknown. func (val Value) ForEachElement(cb ElementCallback) bool { it := val.ElementIterator() for it.Next() { key, val := it.Element() stop := cb(key, val) if stop { return true } } return false } // Not returns the logical inverse of the receiver, which must be of type // Bool or this method will panic. func (val Value) Not() Value { if shortCircuit := mustTypeCheck(Bool, Bool, val); shortCircuit != nil { shortCircuit = forceShortCircuitType(shortCircuit, Bool) return *shortCircuit } return BoolVal(!val.v.(bool)) } // And returns the result of logical AND with the receiver and the other given // value, which must both be of type Bool or this method will panic. func (val Value) And(other Value) Value { if shortCircuit := mustTypeCheck(Bool, Bool, val, other); shortCircuit != nil { shortCircuit = forceShortCircuitType(shortCircuit, Bool) return *shortCircuit } return BoolVal(val.v.(bool) && other.v.(bool)) } // Or returns the result of logical OR with the receiver and the other given // value, which must both be of type Bool or this method will panic. func (val Value) Or(other Value) Value { if shortCircuit := mustTypeCheck(Bool, Bool, val, other); shortCircuit != nil { shortCircuit = forceShortCircuitType(shortCircuit, Bool) return *shortCircuit } return BoolVal(val.v.(bool) || other.v.(bool)) } // LessThan returns True if the receiver is less than the other given value, // which must both be numbers or this method will panic. func (val Value) LessThan(other Value) Value { if shortCircuit := mustTypeCheck(Number, Bool, val, other); shortCircuit != nil { shortCircuit = forceShortCircuitType(shortCircuit, Bool) return *shortCircuit } return BoolVal(val.v.(*big.Float).Cmp(other.v.(*big.Float)) < 0) } // GreaterThan returns True if the receiver is greater than the other given // value, which must both be numbers or this method will panic. func (val Value) GreaterThan(other Value) Value { if shortCircuit := mustTypeCheck(Number, Bool, val, other); shortCircuit != nil { shortCircuit = forceShortCircuitType(shortCircuit, Bool) return *shortCircuit } return BoolVal(val.v.(*big.Float).Cmp(other.v.(*big.Float)) > 0) } // LessThanOrEqualTo is equivalent to LessThan and Equal combined with Or. func (val Value) LessThanOrEqualTo(other Value) Value { return val.LessThan(other).Or(val.Equals(other)) } // GreaterThanOrEqualTo is equivalent to GreaterThan and Equal combined with Or. func (val Value) GreaterThanOrEqualTo(other Value) Value { return val.GreaterThan(other).Or(val.Equals(other)) } // AsString returns the native string from a non-null, non-unknown cty.String // value, or panics if called on any other value. func (val Value) AsString() string { if val.ty != String { panic("not a string") } if val.IsNull() { panic("value is null") } if !val.IsKnown() { panic("value is unknown") } return val.v.(string) } // AsBigFloat returns a big.Float representation of a non-null, non-unknown // cty.Number value, or panics if called on any other value. // // For more convenient conversions to other native numeric types, use the // "convert" package. func (val Value) AsBigFloat() *big.Float { if val.ty != Number { panic("not a number") } if val.IsNull() { panic("value is null") } if !val.IsKnown() { panic("value is unknown") } // Copy the float so that callers can't mutate our internal state ret := *(val.v.(*big.Float)) return &ret } // EncapsulatedValue returns the native value encapsulated in a non-null, // non-unknown capsule-typed value, or panics if called on any other value. // // The result is the same pointer that was passed to CapsuleVal to create // the value. Since cty considers values to be immutable, it is strongly // recommended to treat the encapsulated value itself as immutable too. func (val Value) EncapsulatedValue() interface{} { if !val.Type().IsCapsuleType() { panic("not a capsule-typed value") } return val.v }