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copy_fields.go
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/
copy_fields.go
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package helper
import (
"fmt"
"go/types"
"github.com/octohelm/gengo/pkg/gengo"
)
type FieldContext struct {
InSamePkg bool
HasDeepCopy bool
HasDeepCopyInto bool
PtrResultOrParam bool
}
type StructFieldsCopy struct {
DeepCopyName string
DeepCopyIntoName string
Struct *types.Struct
Skip func(f *types.Var) bool
OnLocalDep func(named *types.Named)
FieldContext func(f *types.Var) *FieldContext
}
func (sfc *StructFieldsCopy) Snippet(c gengo.Context, pkg *types.Package) func(sw gengo.SnippetWriter) {
if sfc.DeepCopyName == "" {
sfc.DeepCopyName = "DeepCopy"
}
if sfc.DeepCopyIntoName == "" {
sfc.DeepCopyIntoName = "DeepCopyInto"
}
return func(sw gengo.SnippetWriter) {
for i := 0; i < sfc.Struct.NumFields(); i++ {
f := sfc.Struct.Field(i)
if sfc.Skip != nil && sfc.Skip(f) {
continue
}
fieldType := f.Type()
switch x := fieldType.(type) {
case *types.Named:
if f.Name() == "Template" {
fmt.Println(x)
}
var fc *FieldContext
if sfc.FieldContext != nil {
if fcc := sfc.FieldContext(f); fcc != nil {
fc = fcc
}
}
if fc == nil {
fc = &FieldContext{}
fc.InSamePkg = x.Obj().Pkg().Path() == pkg.Path()
fc.PtrResultOrParam = true
for i := 0; i < x.NumMethods(); i++ {
m := x.Method(i)
fn := m.Type().(*types.Signature)
// FIXME better check
fc.HasDeepCopy = m.Name() == sfc.DeepCopyName && fn.Results().Len() == 1 && fn.Params().Len() == 0
fc.HasDeepCopyInto = m.Name() == sfc.DeepCopyIntoName && fn.Params().Len() == 1 && fn.Results().Len() == 0
if fc.HasDeepCopy {
if _, ok := fn.Results().At(0).Type().(*types.Pointer); !ok {
fc.PtrResultOrParam = false
}
}
if fc.HasDeepCopyInto {
if _, ok := fn.Params().At(0).Type().(*types.Pointer); !ok {
fc.PtrResultOrParam = false
}
}
}
}
if fc.InSamePkg {
if sfc.OnLocalDep != nil {
sfc.OnLocalDep(x)
}
// always gen
fc.HasDeepCopyInto = true
fc.HasDeepCopy = true
}
if fc.PtrResultOrParam && fc.HasDeepCopyInto {
c.Render(gengo.Snippet{gengo.T: `in.@fieldName.@DeepCopyInto(&out.@fieldName)
`,
"fieldName": gengo.ID(f.Name()),
"DeepCopyInto": gengo.ID(sfc.DeepCopyIntoName),
})
} else if !fc.PtrResultOrParam && fc.HasDeepCopy {
c.Render(gengo.Snippet{gengo.T: `out.@fieldName = in.@fieldName.@DeepCopy()
`,
"fieldName": gengo.ID(f.Name()),
"DeepCopy": gengo.ID(sfc.DeepCopyName),
})
} else if fc.PtrResultOrParam && fc.HasDeepCopy {
c.Render(gengo.Snippet{gengo.T: `out.@fieldName = *in.@fieldName.@DeepCopy()
`,
"fieldName": gengo.ID(f.Name()),
"DeepCopy": gengo.ID(sfc.DeepCopyName),
})
} else {
c.Render(gengo.Snippet{gengo.T: `out.@fieldName = in.@fieldName
`,
"fieldName": gengo.ID(f.Name()),
})
}
case *types.Map:
c.Render(gengo.Snippet{gengo.T: `
if in.@fieldName != nil {
i, o := &in.@fieldName, &out.@fieldName
*o = make(@MapType, len(*i))
for key, val := range *i {
(*o)[key] = val
}
}
`,
"MapType": gengo.ID(x),
"fieldName": gengo.ID(f.Name()),
})
case *types.Slice:
c.Render(gengo.Snippet{gengo.T: `
if in.@fieldName != nil {
i, o := &in.@fieldName, &out.@fieldName
*o = make(@SliceType, len(*i))
copy(*o, *i)
}
`,
"SliceType": gengo.ID(x),
"fieldName": gengo.ID(f.Name()),
})
default:
c.Render(gengo.Snippet{gengo.T: `
out.@fieldName = in.@fieldName
`,
"fieldName": gengo.ID(f.Name()),
})
}
}
}
}