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spec.go
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spec.go
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// Copyright 2021-present The Atlas Authors. All rights reserved.
// This source code is licensed under the Apache 2.0 license found
// in the LICENSE file in the root directory of this source tree.
package schemahcl
import (
"fmt"
"math/big"
"reflect"
"strings"
"ariga.io/atlas/sql/schema"
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-cty/cty/gocty"
)
type (
// Resource is a generic container for resources described in configurations.
Resource struct {
Name string
Qualifier string
Type string
Attrs []*Attr
Children []*Resource
}
// Attr is an attribute of a Resource.
Attr struct {
K string
V cty.Value
}
// Ref implements Value and represents a reference to another Resource.
// The path to a Resource under the root Resource is expressed as "$<type>.<name>..."
// recursively. For example, a resource of type "table" that is named "users" and is a direct
// child of the root Resource's address shall be "$table.users". A child resource of that table
// of type "column" and named "id", shall be referenced as "$table.users.$column.id", and so on.
Ref struct {
V string
}
// RawExpr implements Value and represents any raw expression.
RawExpr struct {
X string
}
// TypeSpec represents a specification for defining a Type.
TypeSpec struct {
// Name is the identifier for the type in an Atlas DDL document.
Name string
// T is the database identifier for the type.
T string
Attributes []*TypeAttr
// RType is the reflect.Type of the schema.Type used to describe the TypeSpec.
// This field is optional and used to determine the TypeSpec in cases where the
// schema.Type does not have a `T` field.
RType reflect.Type
// Format is an optional formatting function.
// If exists, it will be used instead the registry one.
Format func(*Type) (string, error)
// FromSpec is an optional function that can be attached
// to the type spec and allows converting the schema spec
// type to a schema type (from document to database).
FromSpec func(*Type) (schema.Type, error)
// ToSpec is an optional function that can be attached
// to the type spec and allows converting the schema type
// to a schema spec type (from database to document).
ToSpec func(schema.Type) (*Type, error)
}
// TypeAttr describes an attribute of a TypeSpec, for example `varchar` fields
// can have a `size` attribute.
TypeAttr struct {
// Name should be a snake_case of related the schema.Type struct field.
Name string
Kind reflect.Kind
Required bool
}
// Type represents the type of the field in a schema.
Type struct {
T string
Attrs []*Attr
IsRef bool
}
)
// IsRef indicates if the attribute is a reference type.
func (a *Attr) IsRef() bool {
if !a.V.Type().IsCapsuleType() {
return false
}
_, ok := a.V.EncapsulatedValue().(*Ref)
return ok
}
// IsRawExpr indicates if the attribute is a RawExpr type.
func (a *Attr) IsRawExpr() bool {
if !a.V.Type().IsCapsuleType() {
return false
}
_, ok := a.V.EncapsulatedValue().(*RawExpr)
return ok
}
// IsType indicates if the attribute is a type spec.
func (a *Attr) IsType() bool {
if !a.V.Type().IsCapsuleType() {
return false
}
_, ok := a.V.EncapsulatedValue().(*Type)
return ok
}
// Int returns an int from the Value of the Attr. If The value is not a LiteralValue or the value
// cannot be converted to an integer an error is returned.
func (a *Attr) Int() (int, error) {
i, err := a.Int64()
if err != nil {
return 0, err
}
return int(i), nil
}
// Int64 returns an int64 from the Value of the Attr. If The value is not a LiteralValue or the value
// cannot be converted to an integer an error is returned.
func (a *Attr) Int64() (i int64, err error) {
if err = gocty.FromCtyValue(a.V, &i); err != nil {
return 0, err
}
return i, nil
}
// String returns a string from the Value of the Attr. If The value is not a LiteralValue
// an error is returned. String values are expected to be quoted. If the value is not
// properly quoted an error is returned.
func (a *Attr) String() (s string, err error) {
if err = gocty.FromCtyValue(a.V, &s); err != nil {
return "", err
}
return s, nil
}
// Bool returns a boolean from the Value of the Attr. If The value is not a LiteralValue or the value
// cannot be converted to a boolean an error is returned.
func (a *Attr) Bool() (b bool, err error) {
if err = gocty.FromCtyValue(a.V, &b); err != nil {
return false, err
}
return b, nil
}
// Ref extracts the reference from the Value of the Attr.
func (a *Attr) Ref() (string, error) {
ref, ok := a.V.EncapsulatedValue().(*Ref)
if !ok {
return "", fmt.Errorf("schema: cannot read attribute %q as ref", a.K)
}
return ref.V, nil
}
// Type extracts the Type from the Attr.
func (a *Attr) Type() (*Type, error) {
t, ok := a.V.EncapsulatedValue().(*Type)
if !ok {
return nil, fmt.Errorf("schema: cannot read attribute %q as type", a.K)
}
return t, nil
}
// RawExpr extracts the RawExpr from the Attr.
func (a *Attr) RawExpr() (*RawExpr, error) {
if !a.IsRawExpr() {
return nil, fmt.Errorf("schema: cannot read attribute %q as raw expression", a.K)
}
return a.V.EncapsulatedValue().(*RawExpr), nil
}
// Refs returns a slice of references.
func (a *Attr) Refs() ([]*Ref, error) {
refs := make([]*Ref, 0, len(a.V.AsValueSlice()))
for _, v := range a.V.AsValueSlice() {
ref, ok := v.EncapsulatedValue().(*Ref)
if !ok {
return nil, fmt.Errorf("schema: cannot read attribute %q as ref", a.K)
}
refs = append(refs, ref)
}
return refs, nil
}
// Strings returns a slice of strings from the Value of the Attr. If The value is not a ListValue or its
// values cannot be converted to strings an error is returned.
func (a *Attr) Strings() (vs []string, err error) {
if a.V.Type().IsTupleType() {
for _, v := range a.V.AsValueSlice() {
var s string
if err = gocty.FromCtyValue(v, &s); err != nil {
return nil, err
}
vs = append(vs, s)
}
return vs, nil
}
if err = gocty.FromCtyValue(a.V, &vs); err != nil {
return nil, err
}
return vs, nil
}
// PathIndex represents an index in a reference path.
type PathIndex struct {
T string // type
V []string // identifiers
}
// Check if the path index is valid.
func (p *PathIndex) Check() error {
if p.T == "" || len(p.V) == 0 {
return fmt.Errorf("schemahcl: missing type or identifier %v", p)
}
for _, v := range p.V {
if v == "" {
return fmt.Errorf("schemahcl: empty identifier %v", p)
}
}
return nil
}
// ByType returns the path index for the given type.
func (r *Ref) ByType(name string) ([]string, error) {
if r == nil {
return nil, fmt.Errorf("schemahcl: type %q was not found in nil reference", name)
}
path, err := r.Path()
if err != nil {
return nil, err
}
var vs []string
for _, p := range path {
switch {
case p.T != name:
case vs != nil:
return nil, fmt.Errorf("schemahcl: multiple %q found in reference", name)
default:
if err := p.Check(); err != nil {
return nil, err
}
vs = p.V
}
}
if vs == nil {
return nil, fmt.Errorf("schemahcl: missing %q in reference", name)
}
return vs, nil
}
// Path returns a parsed path including block types and their identifiers.
func (r *Ref) Path() (path []PathIndex, err error) {
for i := 0; i < len(r.V); i++ {
var part PathIndex
switch idx := strings.IndexAny(r.V[i:], ".["); {
case r.V[i] != '$':
return nil, fmt.Errorf("schemahcl: missing type in reference %q", r.V[i:])
case idx == -1:
return nil, fmt.Errorf("schemahcl: missing identifier in reference %q", r.V[i:])
default:
part.T = r.V[i+1 : i+idx]
i += idx
}
Ident:
for i < len(r.V) {
switch {
// End of identifier before a type.
case strings.HasPrefix(r.V[i:], ".$"):
break Ident
// Scan identifier.
case r.V[i] == '.':
v := r.V[i+1:]
if idx := strings.IndexAny(v, ".["); idx != -1 {
v = v[:idx]
}
part.V = append(part.V, v)
i += 1 + len(v)
// Scan attribute (["..."]).
case strings.HasPrefix(r.V[i:], "[\""):
idx := scanString(r.V[i+2:])
if idx == -1 {
return nil, fmt.Errorf("schemahcl: unterminated string in reference %q", r.V[i:])
}
v := r.V[i+2 : i+2+idx]
i += 2 + idx
if !strings.HasPrefix(r.V[i:], "\"]") {
return nil, fmt.Errorf("schemahcl: missing ']' in reference %q", r.V[i:])
}
part.V = append(part.V, v)
i += 2
default:
return nil, fmt.Errorf("schemahcl: invalid character in reference %q", r.V[i:])
}
}
if err := part.Check(); err != nil {
return nil, err
}
path = append(path, part)
}
return
}
// BuildRef from a path.
func BuildRef(path []PathIndex) *Ref {
var v string
for _, p := range path {
switch {
case len(p.V) == 1:
v = addr(v, p.T, p.V[0], "")
case len(p.V) == 2:
v = addr(v, p.T, p.V[1], p.V[0])
default:
v = addr(v, p.T, "", "")
}
}
return &Ref{V: v}
}
func scanString(s string) int {
for i := 0; i < len(s); i++ {
switch s[i] {
case '\\':
i++
case '"':
return i
}
}
return -1
}
// Bools returns a slice of bools from the Value of the Attr. If The value is not a ListValue or its
// values cannot be converted to bools an error is returned.
func (a *Attr) Bools() (vs []bool, err error) {
if a.V.Type().IsTupleType() {
for _, v := range a.V.AsValueSlice() {
var b bool
if err = gocty.FromCtyValue(v, &b); err != nil {
return nil, err
}
vs = append(vs, b)
}
return vs, nil
}
if err = gocty.FromCtyValue(a.V, &vs); err != nil {
return nil, err
}
return vs, nil
}
// Resource returns the first child Resource by its type and reports whether it was found.
func (r *Resource) Resource(t string) (*Resource, bool) {
if r == nil {
return nil, false
}
for i := range r.Children {
if r.Children[i].Type == t {
return r.Children[i], true
}
}
return nil, false
}
// Attr returns the Attr by the provided name and reports whether it was found.
func (r *Resource) Attr(name string) (*Attr, bool) {
return attrVal(r.Attrs, name)
}
// SetAttr sets the Attr on the Resource. If r is nil, a zero value Resource
// is initialized. If an Attr with the same key exists, it is replaced by attr.
func (r *Resource) SetAttr(attr *Attr) {
if r == nil {
*r = Resource{}
}
r.Attrs = replaceOrAppendAttr(r.Attrs, attr)
}
// MarshalSpec implements Marshaler.
func (f MarshalerFunc) MarshalSpec(v any) ([]byte, error) {
return f(v)
}
func attrVal(attrs []*Attr, name string) (*Attr, bool) {
for _, attr := range attrs {
if attr.K == name {
return attr, true
}
}
return nil, false
}
func replaceOrAppendAttr(attrs []*Attr, attr *Attr) []*Attr {
for i, v := range attrs {
if v.K == attr.K {
attrs[i] = attr
return attrs
}
}
return append(attrs, attr)
}
// Attr returns a TypeAttr by name and reports if one was found.
func (s *TypeSpec) Attr(name string) (*TypeAttr, bool) {
for _, ta := range s.Attributes {
if ta.Name == name {
return ta, true
}
}
return nil, false
}
var _ Marshaler = MarshalerFunc(nil)
// StringAttr is a helper method for constructing *schemahcl.Attr instances that contain string value.
func StringAttr(k string, v string) *Attr {
return &Attr{
K: k,
V: cty.StringVal(v),
}
}
// IntAttr is a helper method for constructing *schemahcl.Attr instances that contain int64 value.
func IntAttr(k string, v int) *Attr {
return Int64Attr(k, int64(v))
}
// Int64Attr is a helper method for constructing *schemahcl.Attr instances that contain int64 value.
func Int64Attr(k string, v int64) *Attr {
return &Attr{
K: k,
V: cty.NumberVal(new(big.Float).SetInt64(v).SetPrec(512)),
}
}
// BoolAttr is a helper method for constructing *schemahcl.Attr instances that contain a boolean value.
func BoolAttr(k string, v bool) *Attr {
return &Attr{
K: k,
V: cty.BoolVal(v),
}
}
// RefAttr is a helper method for constructing *schemahcl.Attr instances that contain a Ref value.
func RefAttr(k string, v *Ref) *Attr {
return &Attr{
K: k,
V: cty.CapsuleVal(ctyRefType, v),
}
}
// StringsAttr is a helper method for constructing *schemahcl.Attr instances that contain list strings.
func StringsAttr(k string, vs ...string) *Attr {
vv := make([]cty.Value, len(vs))
for i, v := range vs {
vv[i] = cty.StringVal(v)
}
return &Attr{
K: k,
V: cty.ListVal(vv),
}
}
// RefsAttr is a helper method for constructing *schemahcl.Attr instances that contain list references.
func RefsAttr(k string, refs ...*Ref) *Attr {
vv := make([]cty.Value, len(refs))
for i, v := range refs {
vv[i] = cty.CapsuleVal(ctyRefType, v)
}
return &Attr{
K: k,
V: cty.ListVal(vv),
}
}
// RawAttr is a helper method for constructing *schemahcl.Attr instances that contain RawExpr value.
func RawAttr(k string, x string) *Attr {
return &Attr{
K: k,
V: RawExprValue(&RawExpr{X: x}),
}
}
// RawExprValue is a helper method for constructing a cty.Value that capsules a raw expression.
func RawExprValue(x *RawExpr) cty.Value {
return cty.CapsuleVal(ctyRawExpr, x)
}