/
decorator.go
211 lines (195 loc) · 7.82 KB
/
decorator.go
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package main
import (
"fmt"
"github.com/dave/dst/gendst/data"
. "github.com/dave/jennifer/jen"
)
const DSTPATH = "github.com/dave/dst"
func generateDecorator(names []string) error {
f := NewFile("decorator")
f.ImportName(DSTPATH, "dst")
f.Func().Params(Id("f").Op("*").Id("fileDecorator")).Id("decorateNode").Params(
Id("parent").Qual("go/ast", "Node"),
Id("parentName"),
Id("parentField"),
Id("parentFieldType").String(),
Id("n").Qual("go/ast", "Node"),
).Params(
Qual(DSTPATH, "Node"),
Error(),
).BlockFunc(func(g *Group) {
g.If(List(Id("dn"), Id("ok")).Op(":=").Id("f").Dot("Dst").Dot("Nodes").Index(Id("n")), Id("ok")).Block(
Return(Id("dn"), Nil()),
)
g.Switch(Id("n").Op(":=").Id("n").Assert(Id("type"))).BlockFunc(func(g *Group) {
for _, nodeName := range names {
g.Case(Op("*").Qual("go/ast", nodeName)).BlockFunc(func(g *Group) {
switch nodeName {
case "SelectorExpr":
g.Line()
g.Comment("Special case for *ast.SelectorExpr - replace with Ident if needed")
g.List(Id("id"), Err()).Op(":=").Id("f").Dot("decorateSelectorExpr").Call(Id("parent"), Id("parentName"), Id("parentField"), Id("parentFieldType"), Id("n"))
g.If(Err().Op("!=").Nil()).Block(
Return(Nil(), Err()),
)
g.If(Id("id").Op("!=").Nil()).Block(
Return(Id("id"), Nil()),
)
g.Line()
}
g.Id("out").Op(":=").Op("&").Qual(DSTPATH, nodeName).Values()
g.Id("f").Dot("Dst").Dot("Nodes").Index(Id("n")).Op("=").Id("out")
g.Id("f").Dot("Ast").Dot("Nodes").Index(Id("out")).Op("=").Id("n")
if nodeName != "Package" {
g.Line()
g.Id("out").Dot("Decs").Dot("Before").Op("=").Id("f").Dot("before").Index(Id("n"))
g.Id("out").Dot("Decs").Dot("After").Op("=").Id("f").Dot("after").Index(Id("n"))
}
for _, frag := range data.Info[nodeName] {
switch frag := frag.(type) {
case data.Init:
g.Line().Commentf("Init: %s", frag.Name)
g.Add(frag.Field.Get("out")).Op("=").Op("&").Qual(DSTPATH, frag.Type.TypeName()).Values()
case data.Decoration:
// nothing here
case data.String:
g.Line().Commentf("String: %s", frag.Name)
if frag.ValueField != nil {
g.Add(frag.ValueField.Get("out")).Op("=").Add(frag.ValueField.Get("n"))
}
case data.Token:
g.Line().Commentf("Token: %s", frag.Name)
if frag.TokenField != nil {
g.Add(frag.TokenField.Get("out")).Op("=").Add(frag.TokenField.Get("n"))
}
if frag.ExistsField != nil {
g.Add(frag.ExistsField.Get("out")).Op("=").Add(frag.Exists.Get("n", true))
}
case data.List:
g.Line().Commentf("List: %s", frag.Name)
g.For(List(Id("_"), Id("v")).Op(":=").Range().Add(frag.Field.Get("n"))).Block(
List(Id("child"), Err()).Op(":=").Id("f").Dot("decorateNode").Call(Id("n"), Lit(nodeName), Lit(frag.Field.FieldName()), Lit(frag.Elem.TypeName()), Id("v")),
If(Err().Op("!=").Nil()).Block(
Return(Nil(), Err()),
),
frag.Field.Get("out").Op("=").Append(
frag.Field.Get("out"),
Id("child").Assert(frag.Elem.Literal(DSTPATH)),
),
)
case data.Map:
g.Line().Commentf("Map: %s", frag.Name)
g.Add(frag.Field.Get("out")).Op("=").Map(String()).Add(frag.Elem.Literal(DSTPATH)).Values()
g.For(List(Id("k"), Id("v")).Op(":=").Range().Add(frag.Field.Get("n"))).BlockFunc(func(g *Group) {
if frag.Elem.TypeName() == "Object" {
// Special case for Package.Imports
g.List(Id("ob"), Err()).Op(":=").Id("f").Dot("decorateObject").Call(Id("v"))
g.If(Err().Op("!=").Nil()).Block(
Return(Nil(), Err()),
)
g.Add(frag.Field.Get("out")).Index(Id("k")).Op("=").Id("ob")
} else {
g.List(Id("child"), Err()).Op(":=").Id("f").Dot("decorateNode").Call(Id("n"), Lit(nodeName), Lit(frag.Field.FieldName()), Lit(frag.Elem.TypeName()), Id("v"))
g.If(Err().Op("!=").Nil()).Block(
Return(Nil(), Err()),
)
g.Add(frag.Field.Get("out")).Index(Id("k")).Op("=").Id("child").Assert(frag.Elem.Literal(DSTPATH))
}
})
case data.Node:
g.Line().Commentf("Node: %s", frag.Name)
g.If(frag.Field.Get("n").Op("!=").Nil()).Block(
List(Id("child"), Err()).Op(":=").Id("f").Dot("decorateNode").Call(Id("n"), Lit(nodeName), Lit(frag.Field.FieldName()), Lit(frag.Type.TypeName()), frag.Field.Get("n")),
If(Err().Op("!=").Nil()).Block(
Return(Nil(), Err()),
),
frag.Field.Get("out").Op("=").Id("child").Assert(frag.Type.Literal(DSTPATH)),
)
case data.Bad:
g.Line().Comment("Bad")
g.Add(frag.LengthField.Get("out")).Op("=").Add(frag.Length.Get("n", true))
case data.Value:
g.Line().Commentf("Value: %s", frag.Name)
if frag.Value != nil {
g.Add(frag.Field.Get("out")).Op("=").Add(frag.Value.Get("n", true))
} else {
g.Add(frag.Field.Get("out")).Op("=").Add(frag.Field.Get("n"))
}
case data.Scope:
g.Line().Commentf("Scope: %s", frag.Name)
g.List(Id("scope"), Err()).Op(":=").Id("f").Dot("decorateScope").Call(frag.Field.Get("n"))
g.If(Err().Op("!=").Nil()).Block(
Return(Nil(), Err()),
)
g.Add(frag.Field.Get("out")).Op("=").Id("scope")
case data.Object:
g.Line().Commentf("Object: %s", frag.Name)
g.List(Id("ob"), Err()).Op(":=").Id("f").Dot("decorateObject").Call(frag.Field.Get("n"))
g.If(Err().Op("!=").Nil()).Block(
Return(Nil(), Err()),
)
g.Add(frag.Field.Get("out")).Op("=").Id("ob")
case data.PathDecoration:
g.Line().Commentf("Path: %s", frag.Name)
g.If(Id("f").Dot("Resolver").Op("!=").Nil()).Block(
List(Id("path"), Err()).Op(":=").Id("f").Dot("resolvePath").Call(False(), Id("parent"), Id("parentName"), Id("parentField"), Id("parentFieldType"), Id("n")),
If(Err().Op("!=").Nil()).Block(
Return(Nil(), Err()),
),
Add(frag.Field.Get("out")).Op("=").Id("path"),
)
case data.SpecialDecoration:
// ignore
default:
panic(fmt.Sprintf("unknown fragment type %T", frag))
}
}
g.Line()
var found bool
decs := If(List(Id("nd"), Id("ok")).Op(":=").Id("f").Dot("decorations").Index(Id("n")), Id("ok")).BlockFunc(func(g *Group) {
for _, frag := range data.Info[nodeName] {
switch frag := frag.(type) {
case data.Decoration:
found = true
g.If(List(Id("decs"), Id("ok")).Op(":=").Id("nd").Index(Lit(frag.Name)), Id("ok")).Block(
Id("out").Dot("Decs").Dot(frag.Name).Op("=").Id("decs"),
)
}
}
})
if found {
g.Add(decs)
}
g.Line()
g.Return(Id("out"), Nil())
})
}
})
g.Return(Nil(), Nil())
})
return f.Save("./decorator/decorator-node-generated.go")
}
func generateDecoratorTestHelper(names []string) error {
f := NewFile("decorator")
f.ImportName(DSTPATH, "dst")
f.Func().Id("getDecorationInfo").Params(Id("n").Qual(DSTPATH, "Node")).Params(Id("before"), Id("after").Qual(DSTPATH, "SpaceType"), Id("info").Index().Id("decorationInfo")).BlockFunc(func(g *Group) {
g.Switch(Id("n").Op(":=").Id("n").Assert(Id("type"))).BlockFunc(func(g *Group) {
for _, nodeName := range names {
g.Case(Op("*").Qual(DSTPATH, nodeName)).BlockFunc(func(g *Group) {
if nodeName != "Package" {
g.Id("before").Op("=").Id("n").Dot("Decs").Dot("Before")
g.Id("after").Op("=").Id("n").Dot("Decs").Dot("After")
}
for _, frag := range data.Info[nodeName] {
switch frag := frag.(type) {
case data.Decoration:
g.Id("info").Op("=").Append(Id("info"), Id("decorationInfo").Values(Lit(frag.Name), Id("n").Dot("Decs").Dot(frag.Name)))
}
}
})
}
})
g.Return()
})
return f.Save("./decorator/decorator-info-generated.go")
}