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file.go
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file.go
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package schema
import (
"errors"
"fmt"
"math"
"strings"
)
var (
ErrUnresolved = errors.New("unresolved")
)
const (
maxDepth = 10
FileSuffix = ".wap"
)
type File struct {
Dir string
Name string
Path string
Package string
Hash uint64
Err error
contentBytes []byte
Content string
Imports []*Imports
Consts []*Const
Structs []*Struct
Messages []*Message
Enums []*Enum
Unions []*Union
Lists map[string][]*Type
Types map[string]*Type
ImportMap map[string]*Import
Strings map[string][]*Type
}
type Imports struct {
Line Line
Comments []string
List []*Import
}
type Import struct {
Imports *Imports
Parent *File
Path string
Name string
Alias string
File *File
Comments []string
Line Line
}
func (f *File) uniqueName(n string) string {
for {
if f.Types[n] == nil {
return n
}
n = n + "_"
}
}
func (f *File) createTypeName(t *Type, cycle int) string {
if cycle >= maxDepth {
panic("cyclic")
}
switch t.Kind {
case KindBool:
return "Bool"
case KindByte:
return "U8"
case KindInt8:
return "I8"
case KindInt16:
return "I16"
case KindUInt16:
return "U16"
case KindInt32:
return "I32"
case KindUInt32:
return "U32"
case KindInt64:
return "I64"
case KindUInt64:
return "U64"
case KindFloat32:
return "F32"
case KindFloat64:
return "F64"
case KindString:
return fmt.Sprintf("String%d", t.Len)
case KindBytes:
return fmt.Sprintf("Bytes%d", t.Len)
case KindStruct, KindEnum, KindUnion, KindUnknown:
return strings.ReplaceAll(Capitalize(t.Name), ".", "_")
case KindList:
return fmt.Sprintf("%s%dList", f.createTypeName(t.Element, cycle+1), t.Len)
case KindMap:
return f.uniqueName(fmt.Sprintf("%s%sMap", f.createTypeName(t.Element, cycle+1), f.createTypeName(t.Value, cycle+1)))
}
panic("unknown")
}
func (f *File) resolveType(t *Type, cycle int) error {
if t == nil {
return errNotFound
}
if t.Resolved {
return nil
}
if cycle >= maxDepth {
return fmt.Errorf("%s:%d cyclic dependency: %s", t.File.Path, t.Line.Number, t.Name)
}
switch t.Kind {
case KindByte, KindInt8, KindBool:
t.Name = f.createTypeName(t, 0)
t.Size = 1
t.Resolved = true
case KindInt16, KindUInt16:
t.Name = f.createTypeName(t, 0)
t.Size = 2
t.Resolved = true
case KindInt32, KindUInt32, KindFloat32:
t.Name = f.createTypeName(t, 0)
t.Size = 4
t.Resolved = true
case KindInt64, KindUInt64, KindFloat64:
t.Name = f.createTypeName(t, 0)
t.Size = 8
t.Resolved = true
case KindString, KindBytes:
t.Name = f.createTypeName(t, 0)
t.Size = t.Len
t.Resolved = true
if f.Strings == nil {
f.Strings = make(map[string][]*Type)
}
f.Strings[t.Name] = append(f.Strings[t.Name], t)
//t.Size = Align(t.Size)
case KindPad:
t.Resolved = true
return nil
case KindList:
if t.Element == nil {
return errNotFound
}
err := t.Element.File.resolveType(t.Element, cycle+1)
if err != nil {
return err
}
if t.Len == 0 {
return fmt.Errorf("%s:%d lists must specify a length greater than 0", f.Path, t.Line.Number)
}
t.Name = f.createTypeName(t, cycle+1)
t.Size = t.Element.Size * t.Len
t.ItemSize = t.Element.Size
if t.Len <= 255 {
t.Size += 1
t.HeaderSize = 1
} else if t.Len <= math.MaxUint16 {
t.Size += 2
t.HeaderSize = 2
} else {
return fmt.Errorf("%s:%d lists cannot have more than %d elements", f.Path, t.Line.Number, math.MaxUint16)
}
aligned := Align(t)
if aligned > t.Size {
t.Padding = aligned - t.Size
t.Size = aligned
}
t.HeaderOffset = t.Size - t.HeaderSize - 1
//if isGlobal(t, 0) {
// if f.GlobalLists == nil {
// f.GlobalLists = make(map[string][]*Type)
// }
// f.GlobalLists[t.Name] = append(f.GlobalLists[t.Name], t)
//} else {
// if f.Lists == nil {
// f.Lists = make(map[string][]*Type)
// }
// f.Lists[t.Name] = append(f.Lists[t.Name], t)
//}
if f.Lists == nil {
f.Lists = make(map[string][]*Type)
}
f.Lists[t.Name] = append(f.Lists[t.Name], t)
t.Resolved = true
case KindMap:
if t.Element == nil {
return errNotFound
}
if err := t.Element.File.resolveType(t.Element, cycle+1); err != nil {
return err
}
if t.Value == nil {
return errNotFound
}
if err := t.Value.File.resolveType(t.Value, cycle+1); err != nil {
return err
}
t.Name = f.createTypeName(t, 0)
t.HeaderSize = MapHeaderSize
t.ItemSize = MapItemHeaderSize + t.Element.Size + t.Value.Size
t.Size = MapHeaderSize + (t.Len * t.ItemSize)
t.Size = Align(t)
t.Resolved = true
case KindEnum:
if t.Enum == nil {
return fmt.Errorf("%s:%d invalid state: type of enum had a nil *Enum", f.Path, t.Line.Number)
}
if t.Element == nil {
return fmt.Errorf("%s:%d enum '%s' did not specify a type: (e.g. enum Code : byte)",
f.Path, t.Line, t.Name)
}
if err := t.File.resolveType(t.Element, cycle+1); err != nil {
return err
}
t.Size = t.Element.Size
if t.Init == nil {
t.Resolved = true
return nil
}
if err := resolveEnumInit(t, t.Init); err != nil {
return err
}
t.Resolved = true
return nil
case KindStruct:
if t.Struct == nil {
return fmt.Errorf("%s:%d invalid state: type of struct had a nil struct", f.Path, t.Line.Number)
}
for _, field := range t.Struct.Fields {
// Is type imported?
if field.Type.Import != nil {
if field.Type.Import.File != nil {
if err := field.Type.Import.File.resolve(); err != nil {
return err
}
if err := field.Type.Import.File.resolveType(field.Type, cycle+1); err != nil {
return err
}
}
} else if err := field.Type.File.resolveType(field.Type, cycle+1); err != nil {
return err
}
}
t.Struct.setOptionals()
t.Padding = 0
if len(t.Struct.Optionals) == 0 {
t.Padding = 0
} else if len(t.Struct.Optionals) < 8 {
t.Padding = 1
} else {
t.Padding = len(t.Struct.Optionals) / 8
if len(t.Struct.Optionals)%8 > 0 {
t.Padding++
}
}
fields := make([]*StructField, 0, len(t.Struct.Fields))
//if t.Padding > 0 {
// fields = append(fields, &Field{
// Number: -1,
// Struct: t.Struct,
// Name: "",
// Type: &Type{
// File: f,
// Kind: KindPad,
// Resolved: true,
// Size: t.Padding,
// Struct: t.Struct,
// },
// Offset: 0,
// OptOffset: 0,
// OptMask: 0,
// })
//}
t.HeaderSize = t.Padding
t.Size = t.Padding
offset := t.Padding
for _, field := range t.Struct.Fields {
if field.Type.Kind == KindPad {
offset += field.Type.Size
t.Size += field.Type.Size
fields = append(fields, field)
continue
}
alignTo := FieldAlign(field.Type.Size)
pad := 0
diff := offset % alignTo
if diff > 0 {
pad = alignTo - diff
}
// Add padding?
if pad > 0 {
t.Padding += pad
fields = append(fields, &StructField{
Number: -1,
Struct: t.Struct,
Name: "",
Type: &Type{
Line: field.Type.Line,
File: f,
Kind: KindPad,
Resolved: true,
Size: pad,
Struct: t.Struct,
},
Offset: offset,
OptOffset: 0,
OptMask: 0,
})
offset += pad
t.Size += pad
}
field.Offset = offset
offset += field.Type.Size
t.Size += field.Type.Size
fields = append(fields, field)
}
t.Struct.Fields = fields
aligned := Align(t)
if aligned > t.Size {
pad := aligned - t.Size
t.Struct.Fields = append(t.Struct.Fields, &StructField{
Number: -1,
Struct: t.Struct,
Name: "",
Type: &Type{
File: f,
Kind: KindPad,
Resolved: true,
Size: pad,
Struct: t.Struct,
},
Offset: offset,
OptOffset: 0,
OptMask: 0,
})
t.Padding += pad
t.Size = aligned
}
t.Resolved = true
case KindMessage:
case KindUnion:
if t.Union == nil {
return fmt.Errorf("%s:%d invalid state: type of union had a nil *Union", f.Path, t.Line.Number)
}
if len(t.Union.Options) > 255 {
return fmt.Errorf("%s:%d unions can have a maximum of 255 options: %d were declared",
f.Path, t.Line, len(t.Union.Options))
}
t.Size = 0
for _, option := range t.Union.Options {
if err := option.Type.File.resolveType(option.Type, cycle+1); err != nil {
return err
}
if t.Size < option.Type.Size {
t.Size = option.Type.Size
}
}
t.Resolved = true
case KindUnknown:
var found *Type
if t.Import != nil {
// Look for import
imp := f.ImportMap[t.Import.Name]
if imp == nil {
return fmt.Errorf("could not find import for package: %s", t.Import.Name)
}
if imp.Parent == nil {
return errNotFound
}
found = imp.Parent.Types[t.Name]
if found == nil {
return fmt.Errorf("%s:%d type not found: %s.%s", t.File.Path, t.Line.Number, imp.Alias, t.Name)
}
} else {
found = f.Types[t.Name]
if found == nil {
return fmt.Errorf("%s:%d type not found: %s", t.File.Path, t.Line.Number, t.Name)
}
}
if err := found.File.resolveType(found, cycle+1); err != nil {
return err
}
// Copy
optional := t.Optional
init := t.Init
imp := t.Import
file := t.File
*t = *found
t.File = file
t.Optional = optional
t.Import = imp
if init != nil {
switch t.Kind {
case KindEnum:
if err := resolveEnumInit(t, init); err != nil {
return err
}
}
}
t.Resolved = false
if err := f.resolveType(t, cycle+1); err != nil {
return err
}
return nil
}
return nil
}
func (f *File) resolve() error {
var errs []error
for _, t := range f.Types {
if err := f.resolveType(t, 0); err != nil {
errs = append(errs, err)
} else {
//delete(f.resolveTypes, t)
}
}
if len(errs) > 0 {
return errs[0]
}
// Consts
// // Resolve value literals as consts
// for resolveType := range f.resolveTypes {
// field := resolveType.Field
// if field == nil {
// continue
// }
// switch v := resolveType.Init.(type) {
// case Expression:
// t := f.Types[string(v)]
// if t == nil {
// return errors.New(fmt.Sprintf("field '%s' on line %d type '%s' not found",
// field.Name, field.Line, string(v)))
// }
// if t.Const == nil {
// return errors.New(fmt.Sprintf("field '%s' on line %d id '%s' is not a const",
// field.Name, field.Line, string(v)))
// }
// if field.Type.Kind != t.Const.Type.Kind {
// return errors.New(fmt.Sprintf("field '%s' on line %d const '%s' type mismatch: %s <> %s",
// field.Name, field.Line, string(v), field.Type.Name, t.Const.Type.Name))
// }
// field.Type.Init = t.Const
// }
// }
//}
//if len(f.resolveTypes) > 0 {
// return ErrUnresolved
//}
return nil
}