mirror of
https://github.com/letic/terraform-provider-google.git
synced 2024-09-16 08:10:02 +00:00
961c878e0d
Switch to using Go modules. This migrates our vendor.json to use Go 1.11's modules system, and replaces the vendor folder with the output of go mod vendor. The vendored code should remain basically the same; I believe some tree shaking of packages and support scripts/licenses/READMEs/etc. happened. This also fixes Travis and our Makefile to no longer use govendor.
100 lines
2.4 KiB
Go
100 lines
2.4 KiB
Go
// This is a 'go generate'-oriented program for producing the "Variables"
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// method on every Expression implementation found within this package.
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// All expressions share the same implementation for this method, which
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// just wraps the package-level function "Variables" and uses an AST walk
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// to do its work.
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// +build ignore
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package main
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import (
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"fmt"
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"go/ast"
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"go/parser"
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"go/token"
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"os"
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"sort"
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)
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func main() {
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fs := token.NewFileSet()
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pkgs, err := parser.ParseDir(fs, ".", nil, 0)
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if err != nil {
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fmt.Fprintf(os.Stderr, "error while parsing: %s\n", err)
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os.Exit(1)
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}
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pkg := pkgs["hclsyntax"]
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// Walk all the files and collect the receivers of any "Value" methods
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// that look like they are trying to implement Expression.
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var recvs []string
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for _, f := range pkg.Files {
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for _, decl := range f.Decls {
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fd, ok := decl.(*ast.FuncDecl)
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if !ok {
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continue
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}
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if fd.Name.Name != "Value" {
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continue
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}
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results := fd.Type.Results.List
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if len(results) != 2 {
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continue
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}
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valResult := fd.Type.Results.List[0].Type.(*ast.SelectorExpr).X.(*ast.Ident)
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diagsResult := fd.Type.Results.List[1].Type.(*ast.SelectorExpr).X.(*ast.Ident)
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if valResult.Name != "cty" && diagsResult.Name != "hcl" {
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continue
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}
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// If we have a method called Value and it returns something in
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// "cty" followed by something in "hcl" then that's specific enough
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// for now, even though this is not 100% exact as a correct
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// implementation of Value.
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recvTy := fd.Recv.List[0].Type
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switch rtt := recvTy.(type) {
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case *ast.StarExpr:
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name := rtt.X.(*ast.Ident).Name
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recvs = append(recvs, fmt.Sprintf("*%s", name))
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default:
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fmt.Fprintf(os.Stderr, "don't know what to do with a %T receiver\n", recvTy)
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}
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}
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}
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sort.Strings(recvs)
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of, err := os.OpenFile("expression_vars.go", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, os.ModePerm)
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if err != nil {
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fmt.Fprintf(os.Stderr, "failed to open output file: %s\n", err)
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os.Exit(1)
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}
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fmt.Fprint(of, outputPreamble)
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for _, recv := range recvs {
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fmt.Fprintf(of, outputMethodFmt, recv)
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}
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fmt.Fprint(of, "\n")
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}
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const outputPreamble = `package hclsyntax
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// Generated by expression_vars_get.go. DO NOT EDIT.
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// Run 'go generate' on this package to update the set of functions here.
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import (
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"github.com/hashicorp/hcl2/hcl"
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)`
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const outputMethodFmt = `
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func (e %s) Variables() []hcl.Traversal {
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return Variables(e)
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}`
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