/
type_map.go
174 lines (152 loc) 路 5.57 KB
/
type_map.go
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// Copyright 2016-2020, Pulumi Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package model
import (
"fmt"
"github.com/hashicorp/hcl/v2"
"github.com/hashicorp/hcl/v2/hclsyntax"
"github.com/pulumi/pulumi/pkg/v3/codegen/hcl2/model/pretty"
"github.com/pulumi/pulumi/pkg/v3/codegen/hcl2/syntax"
)
// MapType represents maps from strings to particular element types.
type MapType struct {
// ElementType is the element type of the map.
ElementType Type
}
// NewMapType creates a new map type with the given element type.
func NewMapType(elementType Type) *MapType {
return &MapType{ElementType: elementType}
}
func (t *MapType) pretty(seenFormatters map[Type]pretty.Formatter) pretty.Formatter {
var formatter pretty.Formatter
if seenFormatter, ok := seenFormatters[t.ElementType]; ok {
formatter = seenFormatter
} else {
formatter = t.ElementType.pretty(seenFormatters)
}
return &pretty.Wrap{
Prefix: "map(",
Postfix: ")",
Value: formatter,
}
}
func (t *MapType) Pretty() pretty.Formatter {
seenFormatters := map[Type]pretty.Formatter{}
return t.pretty(seenFormatters)
}
// Traverse attempts to traverse the optional type with the given traverser. The result type of traverse(map(T))
// is T; the traversal fails if the traverser is not a string.
func (t *MapType) Traverse(traverser hcl.Traverser) (Traversable, hcl.Diagnostics) {
_, keyType := GetTraverserKey(traverser)
var diagnostics hcl.Diagnostics
if !InputType(StringType).ConversionFrom(keyType).Exists() {
diagnostics = hcl.Diagnostics{unsupportedMapKey(traverser.SourceRange())}
}
return t.ElementType, diagnostics
}
// SyntaxNode returns the syntax node for the type. This is always syntax.None.
func (*MapType) SyntaxNode() hclsyntax.Node {
return syntax.None
}
// Equals returns true if this type has the same identity as the given type.
func (t *MapType) Equals(other Type) bool {
return t.equals(other, nil)
}
func (t *MapType) equals(other Type, seen map[Type]struct{}) bool {
if t == other {
return true
}
otherMap, ok := other.(*MapType)
return ok && t.ElementType.equals(otherMap.ElementType, seen)
}
// AssignableFrom returns true if this type is assignable from the indicated source type. A map(T) is assignable
// from values of type map(U) where T is assignable from U or object(K_0=U_0, ..., K_N=U_N) if T is assignable from the
// unified type of U_0 through U_N.
func (t *MapType) AssignableFrom(src Type) bool {
return assignableFrom(t, src, func() bool {
switch src := src.(type) {
case *MapType:
return t.ElementType.AssignableFrom(src.ElementType)
case *ObjectType:
for _, src := range src.Properties {
if !t.ElementType.AssignableFrom(src) {
return false
}
}
return true
}
return false
})
}
// ConversionFrom returns the kind of conversion (if any) that is possible from the source type to this type. A map(T)
// is safely convertible from map(U) or object({K_0 = U_0 ... K_N = U_N}) if the element type(s) U is/are safely
// convertible to T. If any element type is unsafely convertible to T and no element type is safely convertible to T,
// the conversion is unsafe. Otherwise, no conversion exists.
func (t *MapType) ConversionFrom(src Type) ConversionKind {
kind, _ := t.conversionFrom(src, false, nil)
return kind
}
func (t *MapType) conversionFrom(src Type, unifying bool, seen map[Type]struct{}) (ConversionKind, lazyDiagnostics) {
return conversionFrom(t, src, unifying, seen, func() (ConversionKind, lazyDiagnostics) {
switch src := src.(type) {
case *MapType:
return t.ElementType.conversionFrom(src.ElementType, unifying, seen)
case *ObjectType:
conversionKind := SafeConversion
var diags lazyDiagnostics
for _, src := range src.Properties {
if ck, _ := t.ElementType.conversionFrom(src, unifying, seen); ck < conversionKind {
conversionKind = ck
if conversionKind == NoConversion {
break
}
}
}
return conversionKind, diags
}
return NoConversion, func() hcl.Diagnostics { return hcl.Diagnostics{typeNotConvertible(t, src)} }
})
}
func (t *MapType) String() string {
return t.string(nil)
}
func (t *MapType) string(seen map[Type]struct{}) string {
return fmt.Sprintf("map(%s)", t.ElementType.string(seen))
}
func (t *MapType) unify(other Type) (Type, ConversionKind) {
return unify(t, other, func() (Type, ConversionKind) {
switch other := other.(type) {
case *MapType:
// If the other type is a map type, unify based on the element type.
elementType, conversionKind := t.ElementType.unify(other.ElementType)
return NewMapType(elementType), conversionKind
case *ObjectType:
// If the other type is an object type, prefer the map type, but unify the property types.
elementType, conversionKind := t.ElementType, SafeConversion
for _, other := range other.Properties {
element, ck := elementType.unify(other)
if ck < conversionKind {
conversionKind = ck
}
elementType = element
}
return NewMapType(elementType), conversionKind
default:
// Prefer the map type.
kind, _ := t.conversionFrom(other, true, nil)
return t, kind
}
})
}
func (*MapType) isType() {}