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debug.go
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debug.go
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package cuetsy
import (
"encoding/json"
"fmt"
"io"
"io/ioutil"
"os"
"cuelang.org/go/cue"
"cuelang.org/go/cue/ast"
)
var jf io.Writer = ioutil.Discard
func init() {
// prepdump()
}
type dumpFlag uint64
const (
dumpErrs dumpFlag = 1 << iota
dumpRef
dumpAttrs
dumpSource
dumpKind
dumpIncompleteKind
dumpExpr
dumpBool
dumpBytes
dumpDefault
dumpDocs
dumpErr
dumpEval
dumpExists
dumpStruct
dumpString
dumpInt
dumpInt64
dumpUint64
dumpFloat64
dumpIsClosed
dumpIsConcrete
dumpLabel
dumpList
dumpNull
dumpPath
)
// Helper masks for common exploration patterns
const (
hdumpVals = dumpString | dumpInt | dumpInt64 | dumpUint64 | dumpFloat64 | dumpStruct
hdumpRefs = dumpExpr | dumpRef | dumpStruct | dumpPath | dumpString | dumpAttrs
hdumpTyp = dumpExpr | dumpKind | dumpIncompleteKind
)
func prepdump() {
var err error
jf, err = os.OpenFile("dump.json", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755)
if err != nil {
panic(err)
}
}
// Exercises all read-only funcs on a cue.Value.
//
// For great grokking, because the underlying datastructures are too complex to
// grasp directly.
func dumpJSON(name string, v cue.Value, flag dumpFlag) {
whole := map[string]interface{}{
name: assembleValues(v, flag, 0),
}
b, err := json.MarshalIndent(whole, "", " ")
if err != nil {
panic(err)
}
fmt.Fprint(jf, string(b))
}
func assembleValues(v cue.Value, flags dumpFlag, depth int) (ret map[string]interface{}) {
ret = make(map[string]interface{})
r := func(iv cue.Value) map[string]interface{} {
return assembleValues(iv, flags, depth+1)
}
fl := func(flag dumpFlag) bool {
return flag&flags == flag
}
if depth > 4 {
ret["STOP"] = "RECURSION"
return
}
doAttrs := func(v cue.Value) (attrs []string) {
if fl(dumpAttrs) {
for _, attr := range v.Attributes(cue.ValueAttr) {
attrs = append(attrs, fmt.Sprint(attr))
}
}
return
}
if attrs := doAttrs(v); len(attrs) > 0 {
ret["Attrs()"] = attrs
}
ref := func(v cue.Value) map[string]interface{} {
ret := make(map[string]interface{})
dv := cue.Dereference(v)
ret["eq"] = dv.Equals(v)
// ret["Dereference()"] = r(dv)
if dattrs := doAttrs(dv); len(dattrs) > 0 {
ret["Attrs()"] = dattrs
}
root, path := v.ReferencePath()
if root.Exists() {
ret["ReferencePath()"] = path.String()
}
return ret
}
if fl(dumpRef) {
ret["ref"] = ref(v)
}
if src := v.Source(); fl(dumpSource) && src != nil {
if isrc, ok := src.(*ast.Ident); ok {
ret["Source()"] = []string{fmt.Sprint(src), fmt.Sprintf("%T", isrc), fmt.Sprint(isrc.Scope), fmt.Sprint(isrc.Node)}
} else {
ret["Source()"] = []string{fmt.Sprint(src), fmt.Sprintf("%T", src)}
}
}
if fl(dumpBool) {
if br, err := v.Bool(); err == nil {
ret["Bool()"] = br
} else if fl(dumpErrs) {
ret["ERR Bool()"] = err
}
}
if fl(dumpBytes) {
if by, err := v.Bytes(); err == nil {
ret["Bytes()"] = string(by)
} else if fl(dumpErrs) {
ret["ERR Bytes()"] = err
}
}
// skip Decimal (internal only)
if fl(dumpDefault) {
if def, exists := v.Default(); exists {
ret["Default()"] = r(def)
}
}
if fl(dumpDocs) {
if docs := v.Doc(); len(docs) > 0 {
var docsl []string
for _, d := range docs {
docsl = append(docsl, fmt.Sprint(d))
}
ret["Docs()"] = docsl
}
}
if fl(dumpErr) {
if err := v.Err(); err != nil {
ret["Err()"] = err
}
}
if fl(dumpEval) {
ret["Eval()"] = r(v.Eval())
}
if fl(dumpExists) {
ret["Exists()"] = v.Exists()
}
// Skip Fields(), walking is up to the caller
if fl(dumpFloat64) {
if v2, err := v.Float64(); err == nil {
ret["Float64()"] = v2
} else if fl(dumpErrs) {
ret["ERR Float64()"] = err
}
}
if fl(dumpInt) {
if v2, err := v.Int(nil); err == nil {
ret["Int()"] = v2
} else if fl(dumpErrs) {
ret["ERR Int()"] = err
}
}
if fl(dumpInt64) {
if v2, err := v.Int64(); err == nil {
ret["Int64()"] = v2
} else if fl(dumpErrs) {
ret["ERR Int64()"] = err
}
}
if fl(dumpIsClosed) {
ret["IsClosed()"] = v.IsClosed()
}
if fl(dumpIsConcrete) {
ret["IsConcrete()"] = v.IsConcrete()
}
if fl(dumpKind) {
ret["Kind()"] = fmt.Sprint(v.Kind())
}
if fl(dumpLabel) {
if label, exists := v.Label(); exists {
ret["Label()"] = label
}
}
// Skipping Len. If the return is just a number, why is it a Value?
if fl(dumpList) {
if _, err := v.List(); err == nil {
ret["List()"] = "returns iter"
} else if fl(dumpErrs) {
ret["ERR List()"] = err
}
}
if fl(dumpNull) {
if err := v.Null(); err == nil {
ret["Null()"] = "yup it's null"
} else if fl(dumpErrs) {
ret["ERR Null()"] = err
}
}
ret["Path()"] = fmt.Sprint(v.Path())
// Skip Pos()
// Skip Reader()
if fl(dumpString) {
if v2, err := v.String(); err == nil {
ret["String()"] = v2
} else if fl(dumpErrs) {
ret["ERR String()"] = err
}
}
if fl(dumpStruct) {
if strc, err := v.Struct(); err == nil {
sub := make(map[string]map[string]interface{})
var fld []string
for i := 0; i < strc.Len(); i++ {
sk, sv := strc.At(i)
sub[sk] = r(sv)
fld = append(fld, sk)
}
// ret["Struct() fields"] = sub
ret["Struct() fields"] = fld
} else if fl(dumpErrs) {
ret["ERR Struct()"] = err
}
}
// ret["Syntax()"] = v.Syntax(cue.All())
if fl(dumpUint64) {
if v2, err := v.Uint64(); err == nil {
ret["Uint64()"] = v2
} else if fl(dumpErrs) {
ret["ERR Uint64()"] = err
}
}
// Skip Validate()
if fl(dumpExpr) {
op, vals := v.Expr()
if op != cue.NoOp {
var exprvals []map[string]interface{}
for _, val := range vals {
if !v.Equals(val) {
exprvals = append(exprvals, r(val))
} else {
exprvals = append(exprvals, map[string]interface{}{"(self)": "Equal()s parent"})
}
}
if len(exprvals) > 0 {
ret["Expr()"] = map[string]interface{}{
"Op": op.String(),
"Parts": exprvals,
}
}
}
}
return
}