Add versioned dependencies from godep

1 files changed, 531 insertions, 0 deletions

diff --git a/Godeps/_workspace/src/github.com/obscuren/qml/datatype.go b/Godeps/_workspace/src/github.com/obscuren/qml/datatype.go
new file mode 100644
index 000000000..875c54622
--- /dev/null
+++ b/Godeps/_workspace/src/github.com/obscuren/qml/datatype.go
@@ -0,0 +1,531 @@
+package qml
+
+// #include <stdlib.h>
+// #include "capi.h"
+import "C"
+
+import (
+	"bytes"
+	"fmt"
+	"image/color"
+	"reflect"
+	"strings"
+	"unicode"
+	"unsafe"
+)
+
+var (
+	intIs64 bool
+	intDT   C.DataType
+
+	ptrSize = C.size_t(unsafe.Sizeof(uintptr(0)))
+
+	nilPtr     = unsafe.Pointer(uintptr(0))
+	nilCharPtr = (*C.char)(nilPtr)
+
+	typeString     = reflect.TypeOf("")
+	typeBool       = reflect.TypeOf(false)
+	typeInt        = reflect.TypeOf(int(0))
+	typeInt64      = reflect.TypeOf(int64(0))
+	typeInt32      = reflect.TypeOf(int32(0))
+	typeFloat64    = reflect.TypeOf(float64(0))
+	typeFloat32    = reflect.TypeOf(float32(0))
+	typeIface      = reflect.TypeOf(new(interface{})).Elem()
+	typeRGBA       = reflect.TypeOf(color.RGBA{})
+	typeObjSlice   = reflect.TypeOf([]Object(nil))
+	typeObject     = reflect.TypeOf([]Object(nil)).Elem()
+	typePainter    = reflect.TypeOf(&Painter{})
+	typeList       = reflect.TypeOf(&List{})
+	typeMap        = reflect.TypeOf(&Map{})
+	typeGenericMap = reflect.TypeOf(map[string]interface{}(nil))
+)
+
+func init() {
+	var i int = 1<<31 - 1
+	intIs64 = (i+1 > 0)
+	if intIs64 {
+		intDT = C.DTInt64
+	} else {
+		intDT = C.DTInt32
+	}
+}
+
+// packDataValue packs the provided Go value into a C.DataValue for
+// shiping into C++ land.
+//
+// For simple types (bool, int, etc) value is converted into a
+// native C++ value. For anything else, including cases when value
+// has a type that has an underlying simple type, the Go value itself
+// is encapsulated into a C++ wrapper so that field access and method
+// calls work.
+//
+// This must be run from the main GUI thread due to the cases where
+// calling wrapGoValue is necessary.
+func packDataValue(value interface{}, dvalue *C.DataValue, engine *Engine, owner valueOwner) {
+	datap := unsafe.Pointer(&dvalue.data)
+	if value == nil {
+		dvalue.dataType = C.DTInvalid
+		return
+	}
+	switch value := value.(type) {
+	case string:
+		dvalue.dataType = C.DTString
+		cstr, cstrlen := unsafeStringData(value)
+		*(**C.char)(datap) = cstr
+		dvalue.len = cstrlen
+	case bool:
+		dvalue.dataType = C.DTBool
+		*(*bool)(datap) = value
+	case int:
+		if value > 1<<31-1 {
+			dvalue.dataType = C.DTInt64
+			*(*int64)(datap) = int64(value)
+		} else {
+			dvalue.dataType = C.DTInt32
+			*(*int32)(datap) = int32(value)
+		}
+	case int64:
+		dvalue.dataType = C.DTInt64
+		*(*int64)(datap) = value
+	case int32:
+		dvalue.dataType = C.DTInt32
+		*(*int32)(datap) = value
+	case uint64:
+		dvalue.dataType = C.DTUint64
+		*(*uint64)(datap) = value
+	case uint32:
+		dvalue.dataType = C.DTUint32
+		*(*uint32)(datap) = value
+	case float64:
+		dvalue.dataType = C.DTFloat64
+		*(*float64)(datap) = value
+	case float32:
+		dvalue.dataType = C.DTFloat32
+		*(*float32)(datap) = value
+	case *Common:
+		dvalue.dataType = C.DTObject
+		*(*unsafe.Pointer)(datap) = value.addr
+	case color.RGBA:
+		dvalue.dataType = C.DTColor
+		*(*uint32)(datap) = uint32(value.A)<<24 | uint32(value.R)<<16 | uint32(value.G)<<8 | uint32(value.B)
+	default:
+		dvalue.dataType = C.DTObject
+		if obj, ok := value.(Object); ok {
+			*(*unsafe.Pointer)(datap) = obj.Common().addr
+		} else {
+			*(*unsafe.Pointer)(datap) = wrapGoValue(engine, value, owner)
+		}
+	}
+}
+
+// TODO Handle byte slices.
+
+// unpackDataValue converts a value shipped by C++ into a native Go value.
+//
+// HEADS UP: This is considered safe to be run out of the main GUI thread.
+//           If that changes, fix the call sites.
+func unpackDataValue(dvalue *C.DataValue, engine *Engine) interface{} {
+	datap := unsafe.Pointer(&dvalue.data)
+	switch dvalue.dataType {
+	case C.DTString:
+		s := C.GoStringN(*(**C.char)(datap), dvalue.len)
+		// TODO If we move all unpackDataValue calls to the GUI thread,
+		// can we get rid of this allocation somehow?
+		C.free(unsafe.Pointer(*(**C.char)(datap)))
+		return s
+	case C.DTBool:
+		return *(*bool)(datap)
+	case C.DTInt64:
+		return *(*int64)(datap)
+	case C.DTInt32:
+		return int(*(*int32)(datap))
+	case C.DTUint64:
+		return *(*uint64)(datap)
+	case C.DTUint32:
+		return *(*uint32)(datap)
+	case C.DTUintptr:
+		return *(*uintptr)(datap)
+	case C.DTFloat64:
+		return *(*float64)(datap)
+	case C.DTFloat32:
+		return *(*float32)(datap)
+	case C.DTColor:
+		var c uint32 = *(*uint32)(datap)
+		return color.RGBA{byte(c >> 16), byte(c >> 8), byte(c), byte(c >> 24)}
+	case C.DTGoAddr:
+		// ObjectByName also does this fold conversion, to have access
+		// to the cvalue. Perhaps the fold should be returned.
+		fold := (*(**valueFold)(datap))
+		ensureEngine(engine.addr, unsafe.Pointer(fold))
+		return fold.gvalue
+	case C.DTInvalid:
+		return nil
+	case C.DTObject:
+		// TODO Would be good to preserve identity on the Go side. See initGoType as well.
+		obj := &Common{
+			engine: engine,
+			addr:   *(*unsafe.Pointer)(datap),
+		}
+		if len(converters) > 0 {
+			// TODO Embed the type name in DataValue to drop these calls.
+			typeName := obj.TypeName()
+			if typeName == "PlainObject" {
+				typeName = strings.TrimRight(obj.String("plainType"), "&*")
+				if strings.HasPrefix(typeName, "const ") {
+					typeName = typeName[6:]
+				}
+			}
+			if f, ok := converters[typeName]; ok {
+				return f(engine, obj)
+			}
+		}
+		return obj
+	case C.DTValueList, C.DTValueMap:
+		var dvlist []C.DataValue
+		var dvlisth = (*reflect.SliceHeader)(unsafe.Pointer(&dvlist))
+		dvlisth.Data = uintptr(*(*unsafe.Pointer)(datap))
+		dvlisth.Len = int(dvalue.len)
+		dvlisth.Cap = int(dvalue.len)
+		result := make([]interface{}, len(dvlist))
+		for i := range result {
+			result[i] = unpackDataValue(&dvlist[i], engine)
+		}
+		C.free(*(*unsafe.Pointer)(datap))
+		if dvalue.dataType == C.DTValueList {
+			return &List{result}
+		} else {
+			return &Map{result}
+		}
+	}
+	panic(fmt.Sprintf("unsupported data type: %d", dvalue.dataType))
+}
+
+func dataTypeOf(typ reflect.Type) C.DataType {
+	// Compare against the specific types rather than their kind.
+	// Custom types may have methods that must be supported.
+	switch typ {
+	case typeString:
+		return C.DTString
+	case typeBool:
+		return C.DTBool
+	case typeInt:
+		return intDT
+	case typeInt64:
+		return C.DTInt64
+	case typeInt32:
+		return C.DTInt32
+	case typeFloat32:
+		return C.DTFloat32
+	case typeFloat64:
+		return C.DTFloat64
+	case typeIface:
+		return C.DTAny
+	case typeRGBA:
+		return C.DTColor
+	case typeObjSlice:
+		return C.DTListProperty
+	}
+	return C.DTObject
+}
+
+var typeInfoSize = C.size_t(unsafe.Sizeof(C.GoTypeInfo{}))
+var memberInfoSize = C.size_t(unsafe.Sizeof(C.GoMemberInfo{}))
+
+var typeInfoCache = make(map[reflect.Type]*C.GoTypeInfo)
+
+func appendLoweredName(buf []byte, name string) []byte {
+	var last rune
+	var lasti int
+	for i, rune := range name {
+		if !unicode.IsUpper(rune) {
+			if lasti == 0 {
+				last = unicode.ToLower(last)
+			}
+			buf = append(buf, string(last)...)
+			buf = append(buf, name[i:]...)
+			return buf
+		}
+		if i > 0 {
+			buf = append(buf, string(unicode.ToLower(last))...)
+		}
+		lasti, last = i, rune
+	}
+	return append(buf, string(unicode.ToLower(last))...)
+}
+
+func typeInfo(v interface{}) *C.GoTypeInfo {
+	vt := reflect.TypeOf(v)
+	for vt.Kind() == reflect.Ptr {
+		vt = vt.Elem()
+	}
+
+	typeInfo := typeInfoCache[vt]
+	if typeInfo != nil {
+		return typeInfo
+	}
+
+	typeInfo = (*C.GoTypeInfo)(C.malloc(typeInfoSize))
+	typeInfo.typeName = C.CString(vt.Name())
+	typeInfo.metaObject = nilPtr
+	typeInfo.paint = (*C.GoMemberInfo)(nilPtr)
+
+	var setters map[string]int
+	var getters map[string]int
+
+	// TODO Only do that if it's a struct?
+	vtptr := reflect.PtrTo(vt)
+
+	if vt.Kind() != reflect.Struct {
+		panic(fmt.Sprintf("handling of %s (%#v) is incomplete; please report to the developers", vt, v))
+	}
+
+	numField := vt.NumField()
+	numMethod := vtptr.NumMethod()
+	privateFields := 0
+	privateMethods := 0
+
+	// struct { FooBar T; Baz T } => "fooBar\0baz\0"
+	namesLen := 0
+	for i := 0; i < numField; i++ {
+		field := vt.Field(i)
+		if field.PkgPath != "" {
+			privateFields++
+			continue
+		}
+		namesLen += len(field.Name) + 1
+	}
+	for i := 0; i < numMethod; i++ {
+		method := vtptr.Method(i)
+		if method.PkgPath != "" {
+			privateMethods++
+			continue
+		}
+		namesLen += len(method.Name) + 1
+
+		// Track setters and getters.
+		if len(method.Name) > 3 && method.Name[:3] == "Set" {
+			if method.Type.NumIn() == 2 {
+				if setters == nil {
+					setters = make(map[string]int)
+				}
+				setters[method.Name[3:]] = i
+			}
+		} else if method.Type.NumIn() == 1 && method.Type.NumOut() == 1 {
+			if getters == nil {
+				getters = make(map[string]int)
+			}
+			getters[method.Name] = i
+		}
+	}
+	names := make([]byte, 0, namesLen)
+	for i := 0; i < numField; i++ {
+		field := vt.Field(i)
+		if field.PkgPath != "" {
+			continue // not exported
+		}
+		names = appendLoweredName(names, field.Name)
+		names = append(names, 0)
+	}
+	for i := 0; i < numMethod; i++ {
+		method := vtptr.Method(i)
+		if method.PkgPath != "" {
+			continue // not exported
+		}
+		if _, ok := getters[method.Name]; !ok {
+			continue
+		}
+		if _, ok := setters[method.Name]; !ok {
+			delete(getters, method.Name)
+			continue
+		}
+		// This is a getter method
+		names = appendLoweredName(names, method.Name)
+		names = append(names, 0)
+	}
+	for i := 0; i < numMethod; i++ {
+		method := vtptr.Method(i)
+		if method.PkgPath != "" {
+			continue // not exported
+		}
+		if _, ok := getters[method.Name]; ok {
+			continue // getter already handled above
+		}
+		names = appendLoweredName(names, method.Name)
+		names = append(names, 0)
+	}
+	if len(names) != namesLen {
+		panic("pre-allocated buffer size was wrong")
+	}
+	typeInfo.memberNames = C.CString(string(names))
+
+	// Assemble information on members.
+	membersLen := numField - privateFields + numMethod - privateMethods
+	membersi := uintptr(0)
+	mnamesi := uintptr(0)
+	members := uintptr(C.malloc(memberInfoSize * C.size_t(membersLen)))
+	mnames := uintptr(unsafe.Pointer(typeInfo.memberNames))
+	for i := 0; i < numField; i++ {
+		field := vt.Field(i)
+		if field.PkgPath != "" {
+			continue // not exported
+		}
+		memberInfo := (*C.GoMemberInfo)(unsafe.Pointer(members + uintptr(memberInfoSize)*membersi))
+		memberInfo.memberName = (*C.char)(unsafe.Pointer(mnames + mnamesi))
+		memberInfo.memberType = dataTypeOf(field.Type)
+		memberInfo.reflectIndex = C.int(i)
+		memberInfo.reflectGetIndex = -1
+		memberInfo.reflectSetIndex = -1
+		memberInfo.addrOffset = C.int(field.Offset)
+		membersi += 1
+		mnamesi += uintptr(len(field.Name)) + 1
+		if methodIndex, ok := setters[field.Name]; ok {
+			memberInfo.reflectSetIndex = C.int(methodIndex)
+		}
+	}
+	for i := 0; i < numMethod; i++ {
+		method := vtptr.Method(i)
+		if method.PkgPath != "" {
+			continue // not exported
+		}
+		if _, ok := getters[method.Name]; !ok {
+			continue // not a getter
+		}
+		memberInfo := (*C.GoMemberInfo)(unsafe.Pointer(members + uintptr(memberInfoSize)*membersi))
+		memberInfo.memberName = (*C.char)(unsafe.Pointer(mnames + mnamesi))
+		memberInfo.memberType = dataTypeOf(method.Type.Out(0))
+		memberInfo.reflectIndex = -1
+		memberInfo.reflectGetIndex = C.int(getters[method.Name])
+		memberInfo.reflectSetIndex = C.int(setters[method.Name])
+		memberInfo.addrOffset = 0
+		membersi += 1
+		mnamesi += uintptr(len(method.Name)) + 1
+	}
+	for i := 0; i < numMethod; i++ {
+		method := vtptr.Method(i)
+		if method.PkgPath != "" {
+			continue // not exported
+		}
+		if _, ok := getters[method.Name]; ok {
+			continue // getter already handled above
+		}
+		memberInfo := (*C.GoMemberInfo)(unsafe.Pointer(members + uintptr(memberInfoSize)*membersi))
+		memberInfo.memberName = (*C.char)(unsafe.Pointer(mnames + mnamesi))
+		memberInfo.memberType = C.DTMethod
+		memberInfo.reflectIndex = C.int(i)
+		memberInfo.reflectGetIndex = -1
+		memberInfo.reflectSetIndex = -1
+		memberInfo.addrOffset = 0
+		signature, result := methodQtSignature(method)
+		// TODO The signature data might be embedded in the same array as the member names.
+		memberInfo.methodSignature = C.CString(signature)
+		memberInfo.resultSignature = C.CString(result)
+		// TODO Sort out methods with a variable number of arguments.
+		// It's called while bound, so drop the receiver.
+		memberInfo.numIn = C.int(method.Type.NumIn() - 1)
+		memberInfo.numOut = C.int(method.Type.NumOut())
+		membersi += 1
+		mnamesi += uintptr(len(method.Name)) + 1
+
+		if method.Name == "Paint" && memberInfo.numIn == 1 && memberInfo.numOut == 0 && method.Type.In(1) == typePainter {
+			typeInfo.paint = memberInfo
+		}
+	}
+	typeInfo.members = (*C.GoMemberInfo)(unsafe.Pointer(members))
+	typeInfo.membersLen = C.int(membersLen)
+
+	typeInfo.fields = typeInfo.members
+	typeInfo.fieldsLen = C.int(numField - privateFields + len(getters))
+	typeInfo.methods = (*C.GoMemberInfo)(unsafe.Pointer(members + uintptr(memberInfoSize)*uintptr(typeInfo.fieldsLen)))
+	typeInfo.methodsLen = C.int(numMethod - privateMethods - len(getters))
+
+	if int(membersi) != membersLen {
+		panic("used more space than allocated for member names")
+	}
+	if int(mnamesi) != namesLen {
+		panic("allocated buffer doesn't match used space")
+	}
+	if typeInfo.fieldsLen+typeInfo.methodsLen != typeInfo.membersLen {
+		panic("lengths are inconsistent")
+	}
+
+	typeInfoCache[vt] = typeInfo
+	return typeInfo
+}
+
+func methodQtSignature(method reflect.Method) (signature, result string) {
+	var buf bytes.Buffer
+	for i, rune := range method.Name {
+		if i == 0 {
+			buf.WriteRune(unicode.ToLower(rune))
+		} else {
+			buf.WriteString(method.Name[i:])
+			break
+		}
+	}
+	buf.WriteByte('(')
+	n := method.Type.NumIn()
+	for i := 1; i < n; i++ {
+		if i > 1 {
+			buf.WriteByte(',')
+		}
+		buf.WriteString("QVariant")
+	}
+	buf.WriteByte(')')
+	signature = buf.String()
+
+	switch method.Type.NumOut() {
+	case 0:
+		// keep it as ""
+	case 1:
+		result = "QVariant"
+	default:
+		result = "QVariantList"
+	}
+	return
+}
+
+func hashable(value interface{}) (hashable bool) {
+	defer func() { recover() }()
+	return value == value
+}
+
+// unsafeString returns a Go string backed by C data.
+//
+// If the C data is deallocated or moved, the string will be
+// invalid and will crash the program if used. As such, the
+// resulting string must only be used inside the implementation
+// of the qml package and while the life time of the C data
+// is guaranteed.
+func unsafeString(data *C.char, size C.int) string {
+	var s string
+	sh := (*reflect.StringHeader)(unsafe.Pointer(&s))
+	sh.Data = uintptr(unsafe.Pointer(data))
+	sh.Len = int(size)
+	return s
+}
+
+// unsafeStringData returns a C string backed by Go data. The C
+// string is NOT null-terminated, so its length must be taken
+// into account.
+//
+// If the s Go string is garbage collected, the returned C data
+// will be invalid and will crash the program if used. As such,
+// the resulting data must only be used inside the implementation
+// of the qml package and while the life time of the Go string
+// is guaranteed.
+func unsafeStringData(s string) (*C.char, C.int) {
+	return *(**C.char)(unsafe.Pointer(&s)), C.int(len(s))
+}
+
+// unsafeBytesData returns a C string backed by Go data. The C
+// string is NOT null-terminated, so its length must be taken
+// into account.
+//
+// If the array backing the b Go slice is garbage collected, the
+// returned C data will be invalid and will crash the program if
+// used. As such, the resulting data must only be used inside the
+// implementation of the qml package and while the life time of
+// the Go array is guaranteed.
+func unsafeBytesData(b []byte) (*C.char, C.int) {
+	return *(**C.char)(unsafe.Pointer(&b)), C.int(len(b))
+}