111 lines
3.3 KiB
Go
111 lines
3.3 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/v3/codegen/hcl2/model"
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"github.com/pulumi/pulumi/sdk/v3/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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// IntrinsicConvert is the name of the conversion intrinsic.
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IntrinsicConvert = "__convert"
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// IntrinsicInput is the name of the input intrinsic.
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IntrinsicInput = "__input"
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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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// NewConvertCall returns a new expression that represents a call to IntrinsicConvert.
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func NewConvertCall(from model.Expression, to model.Type) *model.FunctionCallExpression {
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return &model.FunctionCallExpression{
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Name: IntrinsicConvert,
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Signature: model.StaticFunctionSignature{
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Parameters: []model.Parameter{{
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Name: "from",
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Type: from.Type(),
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}},
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ReturnType: to,
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},
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Args: []model.Expression{from},
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}
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}
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// ParseConvertCall extracts the value being converted and the type it is being converted to from a call to the convert
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// intrinsic.
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func ParseConvertCall(c *model.FunctionCallExpression) (model.Expression, model.Type) {
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contract.Assert(c.Name == IntrinsicConvert)
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return c.Args[0], c.Signature.ReturnType
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}
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