- Lazily produce conversion failure diagnostics. This lowers the allocation volume and cuts down on execution time by avoiding the conversion of source and dest types to strings. - Add a fast path for union conversions that checks if the source type is identical to any of the union's element types. Type equality checks are generally much faster than type conversion checks. These changes lead to a significant speedup in codegen time in azure-native.
153 lines
5 KiB
Go
153 lines
5 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/v3/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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kind, _ := t.conversionFrom(src, false, nil)
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return kind
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}
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func (t *MapType) conversionFrom(src Type, unifying bool, seen map[Type]struct{}) (ConversionKind, lazyDiagnostics) {
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return conversionFrom(t, src, unifying, seen, func() (ConversionKind, lazyDiagnostics) {
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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, seen)
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case *ObjectType:
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conversionKind := SafeConversion
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var diags lazyDiagnostics
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for _, src := range src.Properties {
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if ck, _ := t.ElementType.conversionFrom(src, unifying, seen); ck < conversionKind {
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conversionKind = ck
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if conversionKind == NoConversion {
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break
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}
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}
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}
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return conversionKind, diags
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}
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return NoConversion, func() hcl.Diagnostics { return hcl.Diagnostics{typeNotConvertible(t, src)} }
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})
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}
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func (t *MapType) String() string {
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return t.string(nil)
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}
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func (t *MapType) string(seen map[Type]struct{}) string {
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return fmt.Sprintf("map(%s)", t.ElementType.string(seen))
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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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kind, _ := t.conversionFrom(other, true, nil)
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return t, kind
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}
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})
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}
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func (*MapType) isType() {}
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