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internal/core/export: explicit generation of adt types
Change-Id: Ib51a41d9103c6f9e684395a009c8c3b81462c273 Reviewed-on: https://cue-review.googlesource.com/c/cue/+/6622 Reviewed-by: Marcel van Lohuizen <mpvl@golang.org> Reviewed-by: CUE cueckoo <cueckoo@gmail.com>
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// Copyright 2020 CUE Authors | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package export | ||
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import ( | ||
"fmt" | ||
"strconv" | ||
"strings" | ||
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"cuelang.org/go/cue/ast" | ||
"cuelang.org/go/cue/ast/astutil" | ||
"cuelang.org/go/cue/token" | ||
"cuelang.org/go/internal/core/adt" | ||
) | ||
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func (e *exporter) ident(x adt.Feature) *ast.Ident { | ||
s := e.ctx.IndexToString(int64(x.Index())) | ||
if !ast.IsValidIdent(s) { | ||
panic(s + " is not a valid identifier") | ||
} | ||
return ast.NewIdent(s) | ||
} | ||
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func (e *exporter) adt(expr adt.Expr, conjuncts []adt.Conjunct) ast.Expr { | ||
switch x := expr.(type) { | ||
case adt.Value: | ||
return e.expr(x) | ||
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case *adt.ListLit: | ||
a := []ast.Expr{} | ||
for _, x := range x.Elems { | ||
a = append(a, e.elem(x)) | ||
} | ||
return ast.NewList(a...) | ||
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case *adt.StructLit: | ||
// TODO: should we use pushFrame here? | ||
// _, saved := e.pushFrame([]adt.Conjunct{adt.MakeConjunct(nil, x)}) | ||
// defer e.popFrame(saved) | ||
// s := e.frame(0).scope | ||
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s := &ast.StructLit{} | ||
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for _, d := range x.Decls { | ||
s.Elts = append(s.Elts, e.decl(d)) | ||
} | ||
return s | ||
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case *adt.FieldReference: | ||
f := e.frame(x.UpCount) | ||
ident := e.ident(x.Label) | ||
entry := f.fields[x.Label] | ||
entry.references = append(entry.references, ident) | ||
return ident | ||
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case *adt.LabelReference: | ||
// get potential label from Source. Otherwise use X. | ||
f := e.frame(x.UpCount) | ||
var ident *ast.Ident | ||
if f.field == nil { | ||
// This can happen when the LabelReference is evaluated outside of | ||
// normal evaluation, that is, if a pattern constraint or | ||
// additional constraint is evaluated by itself. | ||
return ast.NewIdent("string") | ||
} | ||
list, ok := f.field.Label.(*ast.ListLit) | ||
if !ok || len(list.Elts) != 1 { | ||
panic("label reference to non-pattern constraint field or invalid list") | ||
} | ||
if a, ok := list.Elts[0].(*ast.Alias); ok { | ||
ident = ast.NewIdent(a.Ident.Name) | ||
} else { | ||
ident = ast.NewIdent("X" + strconv.Itoa(e.unique)) | ||
e.unique++ | ||
list.Elts[0] = &ast.Alias{ | ||
Ident: ast.NewIdent(ident.Name), | ||
Expr: list.Elts[0], | ||
} | ||
} | ||
ident.Scope = f.field | ||
ident.Node = f.labelExpr | ||
return ident | ||
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case *adt.DynamicReference: | ||
// get potential label from Source. Otherwise use X. | ||
ident := ast.NewIdent("X") | ||
f := e.frame(x.UpCount) | ||
ident.Scope = f.field | ||
ident.Node = f.field | ||
return ident | ||
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case *adt.ImportReference: | ||
importPath := x.ImportPath.StringValue(e.index) | ||
spec := ast.NewImport(nil, importPath) | ||
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info, _ := astutil.ParseImportSpec(spec) | ||
name := info.PkgName | ||
if x.Label != 0 { | ||
name = x.Label.StringValue(e.index) | ||
if name != info.PkgName { | ||
spec.Name = ast.NewIdent(name) | ||
} | ||
} | ||
ident := ast.NewIdent(name) | ||
ident.Node = spec | ||
return ident | ||
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case *adt.LetReference: | ||
f := e.frame(x.UpCount) | ||
let := f.let[x.X] | ||
if let == nil { | ||
if f.let == nil { | ||
f.let = map[adt.Expr]*ast.LetClause{} | ||
} | ||
let = &ast.LetClause{Expr: e.expr(x.X)} | ||
f.let[x.X] = let | ||
} | ||
ident := e.ident(x.Label) | ||
ident.Node = let | ||
ident.Scope = f.scope | ||
return ident | ||
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case *adt.SelectorExpr: | ||
return &ast.SelectorExpr{ | ||
X: e.expr(x.X), | ||
Sel: e.ident(x.Sel), | ||
} | ||
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case *adt.IndexExpr: | ||
return &ast.IndexExpr{ | ||
X: e.expr(x.X), | ||
Index: e.expr(x.Index), | ||
} | ||
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case *adt.SliceExpr: | ||
var lo, hi ast.Expr | ||
if x.Lo != nil { | ||
lo = e.expr(x.Lo) | ||
} | ||
if x.Hi != nil { | ||
hi = e.expr(x.Hi) | ||
} | ||
// TODO: Stride not yet? implemented. | ||
// if x.Stride != nil { | ||
// stride = e.expr(x.Stride) | ||
// } | ||
return &ast.SliceExpr{X: e.expr(x.X), Low: lo, High: hi} | ||
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case *adt.Interpolation: | ||
t := &ast.Interpolation{} | ||
multiline := false | ||
// TODO: mark formatting in interpolation itself. | ||
for i := 0; i < len(x.Parts); i += 2 { | ||
str := x.Parts[i].(*adt.String).Str | ||
if strings.IndexByte(str, '\n') >= 0 { | ||
multiline = true | ||
break | ||
} | ||
} | ||
quote := `"` | ||
if multiline { | ||
quote = `"""` | ||
} | ||
prefix := quote | ||
suffix := `\(` | ||
for i, elem := range x.Parts { | ||
if i%2 == 1 { | ||
t.Elts = append(t.Elts, e.expr(elem)) | ||
} else { | ||
buf := []byte(prefix) | ||
if i == len(x.Parts)-1 { | ||
suffix = quote | ||
} | ||
str := elem.(*adt.String).Str | ||
if multiline { | ||
buf = appendEscapeMulti(buf, str, '"') | ||
} else { | ||
buf = appendEscaped(buf, str, '"', true) | ||
} | ||
buf = append(buf, suffix...) | ||
t.Elts = append(t.Elts, &ast.BasicLit{ | ||
Kind: token.STRING, | ||
Value: string(buf), | ||
}) | ||
} | ||
prefix = ")" | ||
} | ||
return t | ||
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case *adt.BoundExpr: | ||
return &ast.UnaryExpr{ | ||
Op: x.Op.Token(), | ||
X: e.expr(x.Expr), | ||
} | ||
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case *adt.UnaryExpr: | ||
return &ast.UnaryExpr{ | ||
Op: x.Op.Token(), | ||
X: e.expr(x.X), | ||
} | ||
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case *adt.BinaryExpr: | ||
return &ast.BinaryExpr{ | ||
Op: x.Op.Token(), | ||
X: e.expr(x.X), | ||
Y: e.expr(x.Y), | ||
} | ||
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case *adt.CallExpr: | ||
a := []ast.Expr{} | ||
for _, arg := range x.Args { | ||
v := e.expr(arg) | ||
if v == nil { | ||
e.expr(arg) | ||
panic("") | ||
} | ||
a = append(a, v) | ||
} | ||
fun := e.expr(x.Fun) | ||
return &ast.CallExpr{Fun: fun, Args: a} | ||
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case *adt.DisjunctionExpr: | ||
a := []ast.Expr{} | ||
for _, d := range x.Values { | ||
v := e.expr(d.Val) | ||
if d.Default { | ||
v = &ast.UnaryExpr{Op: token.MUL, X: v} | ||
} | ||
a = append(a, v) | ||
} | ||
return ast.NewBinExpr(token.OR, a...) | ||
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default: | ||
panic(fmt.Sprintf("unknown field %T", x)) | ||
} | ||
} | ||
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func (e *exporter) decl(d adt.Decl) ast.Decl { | ||
switch x := d.(type) { | ||
case adt.Elem: | ||
return e.elem(x) | ||
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case *adt.Field: | ||
e.setDocs(x) | ||
f := &ast.Field{ | ||
Label: e.stringLabel(x.Label), | ||
Value: e.expr(x.Value), | ||
} | ||
e.addField(x.Label, f.Value) | ||
// extractDocs(nil) | ||
return f | ||
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case *adt.OptionalField: | ||
e.setDocs(x) | ||
f := &ast.Field{ | ||
Label: e.stringLabel(x.Label), | ||
Optional: token.NoSpace.Pos(), | ||
Value: e.expr(x.Value), | ||
} | ||
e.addField(x.Label, f.Value) | ||
// extractDocs(nil) | ||
return f | ||
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case *adt.BulkOptionalField: | ||
e.setDocs(x) | ||
// set bulk in frame. | ||
frame := e.frame(0) | ||
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expr := e.expr(x.Filter) | ||
frame.labelExpr = expr // see astutil.Resolve. | ||
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if x.Label != 0 { | ||
expr = &ast.Alias{Ident: e.ident(x.Label), Expr: expr} | ||
} | ||
f := &ast.Field{ | ||
Label: ast.NewList(expr), | ||
} | ||
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frame.field = f | ||
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f.Value = e.expr(x.Value) | ||
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return f | ||
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case *adt.DynamicField: | ||
e.setDocs(x) | ||
key := e.expr(x.Key) | ||
if _, ok := key.(*ast.Interpolation); !ok { | ||
key = &ast.ParenExpr{X: key} | ||
} | ||
f := &ast.Field{ | ||
Label: key.(ast.Label), | ||
} | ||
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frame := e.frame(0) | ||
frame.field = f | ||
frame.labelExpr = key | ||
// extractDocs(nil) | ||
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f.Value = e.expr(x.Value) | ||
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return f | ||
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default: | ||
panic(fmt.Sprintf("unknown field %T", x)) | ||
} | ||
} | ||
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func (e *exporter) elem(d adt.Elem) ast.Expr { | ||
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switch x := d.(type) { | ||
case adt.Expr: | ||
return e.expr(x) | ||
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case *adt.Ellipsis: | ||
t := &ast.Ellipsis{} | ||
if x.Value != nil { | ||
t.Type = e.expr(x.Value) | ||
} | ||
return t | ||
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case adt.Yielder: | ||
return e.comprehension(x) | ||
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default: | ||
panic(fmt.Sprintf("unknown field %T", x)) | ||
} | ||
} | ||
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func (e *exporter) comprehension(y adt.Yielder) ast.Expr { | ||
c := &ast.Comprehension{} | ||
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for { | ||
switch x := y.(type) { | ||
case *adt.ForClause: | ||
value := e.ident(x.Value) | ||
clause := &ast.ForClause{ | ||
Value: value, | ||
Source: e.expr(x.Src), | ||
} | ||
c.Clauses = append(c.Clauses, clause) | ||
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_, saved := e.pushFrame(nil) | ||
defer e.popFrame(saved) | ||
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if x.Key != 0 { | ||
key := e.ident(x.Key) | ||
clause.Key = key | ||
e.addField(x.Key, clause) | ||
} | ||
e.addField(x.Value, clause) | ||
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y = x.Dst | ||
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case *adt.IfClause: | ||
clause := &ast.IfClause{Condition: e.expr(x.Condition)} | ||
c.Clauses = append(c.Clauses, clause) | ||
y = x.Dst | ||
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case *adt.LetClause: | ||
clause := &ast.LetClause{Expr: e.expr(x.Expr)} | ||
c.Clauses = append(c.Clauses, clause) | ||
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_, saved := e.pushFrame(nil) | ||
defer e.popFrame(saved) | ||
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e.addField(x.Label, clause) | ||
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y = x.Dst | ||
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case *adt.ValueClause: | ||
c.Value = e.expr(x.StructLit) | ||
return c | ||
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default: | ||
panic(fmt.Sprintf("unknown field %T", x)) | ||
} | ||
} | ||
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} |
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