2e9499a000
Some of the apply rewriter's assumptions were broken by the richer expressions available in HCL2. These changes fix those broken assumptions, in particular the assumption that only scope traversal expressions are sources of eventual values.
84 lines
2.4 KiB
Go
84 lines
2.4 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 hcl2
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import (
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"github.com/pulumi/pulumi/pkg/v2/codegen/hcl2/model"
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"github.com/pulumi/pulumi/sdk/v2/go/common/util/contract"
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)
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const (
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// IntrinsicApply is the name of the apply intrinsic.
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IntrinsicApply = "__apply"
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)
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func isOutput(t model.Type) bool {
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switch t := t.(type) {
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case *model.OutputType:
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return true
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case *model.UnionType:
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for _, t := range t.ElementTypes {
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if _, isOutput := t.(*model.OutputType); isOutput {
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return true
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}
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}
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}
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return false
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}
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// NewApplyCall returns a new expression that represents a call to IntrinsicApply.
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func NewApplyCall(args []model.Expression, then *model.AnonymousFunctionExpression) *model.FunctionCallExpression {
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signature := model.StaticFunctionSignature{
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Parameters: make([]model.Parameter, len(args)+1),
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}
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returnsOutput := false
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exprs := make([]model.Expression, len(args)+1)
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for i, a := range args {
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exprs[i] = a
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if isOutput := isOutput(a.Type()); isOutput {
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returnsOutput = true
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}
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signature.Parameters[i] = model.Parameter{
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Name: then.Signature.Parameters[i].Name,
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Type: a.Type(),
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}
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}
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exprs[len(exprs)-1] = then
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signature.Parameters[len(signature.Parameters)-1] = model.Parameter{
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Name: "then",
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Type: then.Type(),
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}
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if returnsOutput {
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signature.ReturnType = model.NewOutputType(then.Signature.ReturnType)
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} else {
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signature.ReturnType = model.NewPromiseType(then.Signature.ReturnType)
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}
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return &model.FunctionCallExpression{
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Name: IntrinsicApply,
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Signature: signature,
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Args: exprs,
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}
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}
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// ParseApplyCall extracts the apply arguments and the continuation from a call to the apply intrinsic.
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func ParseApplyCall(c *model.FunctionCallExpression) (applyArgs []model.Expression,
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then *model.AnonymousFunctionExpression) {
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contract.Assert(c.Name == IntrinsicApply)
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return c.Args[:len(c.Args)-1], c.Args[len(c.Args)-1].(*model.AnonymousFunctionExpression)
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}
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