90 lines
2.2 KiB
Go
90 lines
2.2 KiB
Go
// Mgmt
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// Copyright (C) 2013-2017+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package hil
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import (
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"fmt"
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"strings"
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"github.com/hashicorp/hil/ast"
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)
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// Variable defines an interpolated variable.
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type Variable interface {
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Key() string
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}
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// ResourceVariable defines a variable type used to reference fields of a resource
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// e.g. ${file.file1.Content}
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type ResourceVariable struct {
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Kind, Name, Field string
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}
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// Key returns a string representation of the variable key.
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func (r *ResourceVariable) Key() string {
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return fmt.Sprintf("%s.%s.%s", r.Kind, r.Name, r.Field)
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}
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// NewInterpolatedVariable takes a variable key and return the interpolated variable
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// of the required type.
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func NewInterpolatedVariable(k string) (Variable, error) {
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// for now resource variables are the only thing.
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parts := strings.SplitN(k, ".", 3)
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return &ResourceVariable{
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Kind: parts[0],
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Name: parts[1],
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Field: parts[2],
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}, nil
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}
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// ParseVariables will traverse a HIL tree looking for variables and returns a
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// list of them.
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func ParseVariables(tree ast.Node) ([]Variable, error) {
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var result []Variable
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var finalErr error
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visitor := func(n ast.Node) ast.Node {
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if finalErr != nil {
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return n
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}
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switch nt := n.(type) {
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case *ast.VariableAccess:
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v, err := NewInterpolatedVariable(nt.Name)
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if err != nil {
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finalErr = err
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return n
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}
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result = append(result, v)
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default:
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return n
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}
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return n
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}
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tree.Accept(visitor)
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if finalErr != nil {
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return nil, finalErr
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}
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return result, nil
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}
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