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