mirror of https://github.com/pulumi/pulumi.git
86 lines
3.4 KiB
Go
86 lines
3.4 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 model
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import (
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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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// FunctionSignature represents a possibly-type-polymorphic function signature.
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type FunctionSignature interface {
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// GetSignature returns the static signature for the function when invoked with the given arguments.
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GetSignature(arguments []Expression) (StaticFunctionSignature, hcl.Diagnostics)
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}
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// Parameter represents a single function parameter.
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type Parameter struct {
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Name string // The name of the parameter.
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Type Type // The type of the parameter.
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}
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// StaticFunctionSignature records the parameters and return type of a function.
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type StaticFunctionSignature struct {
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// The function's fixed parameters.
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Parameters []Parameter
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// The function's variadic parameter, if any. Any arguments that follow a function's fixed arguments must be
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// assignable to this parameter.
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VarargsParameter *Parameter
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// The return type of the function.
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ReturnType Type
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// Determines whether the input bag should be treated as a single argument or as multiple arguments.
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MultiArgumentInputs bool
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}
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// GetSignature returns the static signature itself.
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func (fs StaticFunctionSignature) GetSignature(arguments []Expression) (StaticFunctionSignature, hcl.Diagnostics) {
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return fs, nil
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}
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// GenericFunctionSignature represents a type-polymorphic function signature. The underlying function will be
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// invoked by GenericFunctionSignature.GetSignature to compute the static signature of the function.
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type GenericFunctionSignature func(arguments []Expression) (StaticFunctionSignature, hcl.Diagnostics)
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// GetSignature returns the static function signature when it is invoked with the given arguments.
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func (fs GenericFunctionSignature) GetSignature(arguments []Expression) (StaticFunctionSignature, hcl.Diagnostics) {
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return fs(arguments)
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}
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// Function represents a function definition.
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type Function struct {
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signature FunctionSignature
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}
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// NewFunction creates a new function with the given signature.
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func NewFunction(signature FunctionSignature) *Function {
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return &Function{signature: signature}
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}
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// SyntaxNode returns the syntax node for the function, which is always syntax.None.
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func (f *Function) SyntaxNode() hclsyntax.Node {
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return syntax.None
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}
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// Traverse attempts to traverse the function definition. This will always fail: functions are not traversable.
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func (f *Function) Traverse(traverser hcl.Traverser) (Traversable, hcl.Diagnostics) {
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return DynamicType, hcl.Diagnostics{cannotTraverseFunction(traverser.SourceRange())}
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}
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// GetSignature returns the static signature of the function when it is invoked with the given arguments.
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func (f *Function) GetSignature(arguments []Expression) (StaticFunctionSignature, hcl.Diagnostics) {
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return f.signature.GetSignature(arguments)
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}
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