1 files changed, 356 insertions, 0 deletions
diff --git a/vendor/gopkg.in/olebedev/go-duktape.v3/duktape.go b/vendor/gopkg.in/olebedev/go-duktape.v3/duktape.go
new file mode 100644
index 000000000..f0806fcae
--- /dev/null
+++ b/vendor/gopkg.in/olebedev/go-duktape.v3/duktape.go
@@ -0,0 +1,356 @@
+package duktape
+
+/*
+#cgo !windows CFLAGS: -std=c99 -O3 -Wall -fomit-frame-pointer -fstrict-aliasing
+#cgo windows CFLAGS: -O3 -Wall -fomit-frame-pointer -fstrict-aliasing
+#cgo linux LDFLAGS: -lm
+#cgo freebsd LDFLAGS: -lm
+
+#include "duktape.h"
+#include "duk_logging.h"
+#include "duk_print_alert.h"
+#include "duk_module_duktape.h"
+#include "duk_console.h"
+extern duk_ret_t goFunctionCall(duk_context *ctx);
+extern void goFinalizeCall(duk_context *ctx);
+*/
+import "C"
+import (
+	"errors"
+	"fmt"
+	"regexp"
+	"sync"
+	"unsafe"
+)
+
+var reFuncName = regexp.MustCompile("^[a-z_][a-z0-9_]*([A-Z_][a-z0-9_]*)*$")
+
+const (
+	goFunctionPtrProp = "\xff" + "goFunctionPtrProp"
+	goContextPtrProp  = "\xff" + "goContextPtrProp"
+)
+
+type Context struct {
+	*context
+}
+
+// transmute replaces the value from Context with the value of pointer
+func (c *Context) transmute(p unsafe.Pointer) {
+	*c = *(*Context)(p)
+}
+
+// this is a pojo containing only the values of the Context
+type context struct {
+	sync.Mutex
+	duk_context *C.duk_context
+	fnIndex     *functionIndex
+	timerIndex  *timerIndex
+}
+
+// New returns plain initialized duktape context object
+// See: http://duktape.org/api.html#duk_create_heap_default
+func New() *Context {
+	d := &Context{
+		&context{
+			duk_context: C.duk_create_heap(nil, nil, nil, nil, nil),
+			fnIndex:     newFunctionIndex(),
+			timerIndex:  &timerIndex{},
+		},
+	}
+
+	ctx := d.duk_context
+	C.duk_logging_init(ctx, 0)
+	C.duk_print_alert_init(ctx, 0)
+	C.duk_module_duktape_init(ctx)
+	C.duk_console_init(ctx, 0)
+
+	return d
+}
+
+// Flags is a set of flags for controlling the behaviour of duktape.
+type Flags struct {
+	Logging    uint
+	PrintAlert uint
+	Console    uint
+}
+
+// FlagConsoleProxyWrapper is a Console flag.
+// Use a proxy wrapper to make undefined methods (console.foo()) no-ops.
+const FlagConsoleProxyWrapper = 1 << 0
+
+// FlagConsoleFlush is a Console flag.
+// Flush output after every call.
+const FlagConsoleFlush = 1 << 1
+
+// NewWithFlags returns plain initialized duktape context object
+// You can control the behaviour of duktape by setting flags.
+// See: http://duktape.org/api.html#duk_create_heap_default
+func NewWithFlags(flags *Flags) *Context {
+	d := &Context{
+		&context{
+			duk_context: C.duk_create_heap(nil, nil, nil, nil, nil),
+			fnIndex:     newFunctionIndex(),
+			timerIndex:  &timerIndex{},
+		},
+	}
+
+	ctx := d.duk_context
+	C.duk_logging_init(ctx, C.duk_uint_t(flags.Logging))
+	C.duk_print_alert_init(ctx, C.duk_uint_t(flags.PrintAlert))
+	C.duk_module_duktape_init(ctx)
+	C.duk_console_init(ctx, C.duk_uint_t(flags.Console))
+
+	return d
+}
+
+func contextFromPointer(ctx *C.duk_context) *Context {
+	return &Context{&context{duk_context: ctx}}
+}
+
+// PushGlobalGoFunction push the given function into duktape global object
+// Returns non-negative index (relative to stack bottom) of the pushed function
+// also returns error if the function name is invalid
+func (d *Context) PushGlobalGoFunction(name string, fn func(*Context) int) (int, error) {
+	if !reFuncName.MatchString(name) {
+		return -1, errors.New("Malformed function name '" + name + "'")
+	}
+
+	d.PushGlobalObject()
+	idx := d.PushGoFunction(fn)
+	d.PutPropString(-2, name)
+	d.Pop()
+
+	return idx, nil
+}
+
+// PushGoFunction push the given function into duktape stack, returns non-negative
+// index (relative to stack bottom) of the pushed function
+func (d *Context) PushGoFunction(fn func(*Context) int) int {
+	funPtr := d.fnIndex.add(fn)
+	ctxPtr := contexts.add(d)
+
+	idx := d.PushCFunction((*[0]byte)(C.goFunctionCall), C.DUK_VARARGS)
+	d.PushCFunction((*[0]byte)(C.goFinalizeCall), 1)
+	d.PushPointer(funPtr)
+	d.PutPropString(-2, goFunctionPtrProp)
+	d.PushPointer(ctxPtr)
+	d.PutPropString(-2, goContextPtrProp)
+	d.SetFinalizer(-2)
+
+	d.PushPointer(funPtr)
+	d.PutPropString(-2, goFunctionPtrProp)
+	d.PushPointer(ctxPtr)
+	d.PutPropString(-2, goContextPtrProp)
+
+	return idx
+}
+
+//export goFunctionCall
+func goFunctionCall(cCtx *C.duk_context) C.duk_ret_t {
+	d := contextFromPointer(cCtx)
+
+	funPtr, ctx := d.getFunctionPtrs()
+	d.transmute(unsafe.Pointer(ctx))
+
+	result := d.fnIndex.get(funPtr)(d)
+
+	return C.duk_ret_t(result)
+}
+
+//export goFinalizeCall
+func goFinalizeCall(cCtx *C.duk_context) {
+	d := contextFromPointer(cCtx)
+
+	funPtr, ctx := d.getFunctionPtrs()
+	d.transmute(unsafe.Pointer(ctx))
+
+	d.fnIndex.delete(funPtr)
+}
+
+func (d *Context) getFunctionPtrs() (unsafe.Pointer, *Context) {
+	d.PushCurrentFunction()
+	d.GetPropString(-1, goFunctionPtrProp)
+	funPtr := d.GetPointer(-1)
+
+	d.Pop()
+
+	d.GetPropString(-1, goContextPtrProp)
+	ctx := contexts.get(d.GetPointer(-1))
+	d.Pop2()
+	return funPtr, ctx
+}
+
+// Destroy destroy all the references to the functions and freed the pointers
+func (d *Context) Destroy() {
+	d.fnIndex.destroy()
+	contexts.delete(d)
+}
+
+type Error struct {
+	Type       string
+	Message    string
+	FileName   string
+	LineNumber int
+	Stack      string
+}
+
+func (e *Error) Error() string {
+	return fmt.Sprintf("%s: %s", e.Type, e.Message)
+}
+
+type Type int
+
+func (t Type) IsNone() bool      { return t == TypeNone }
+func (t Type) IsUndefined() bool { return t == TypeUndefined }
+func (t Type) IsNull() bool      { return t == TypeNull }
+func (t Type) IsBool() bool      { return t == TypeBoolean }
+func (t Type) IsNumber() bool    { return t == TypeNumber }
+func (t Type) IsString() bool    { return t == TypeString }
+func (t Type) IsObject() bool    { return t == TypeObject }
+func (t Type) IsBuffer() bool    { return t == TypeBuffer }
+func (t Type) IsPointer() bool   { return t == TypePointer }
+func (t Type) IsLightFunc() bool { return t == TypeLightFunc }
+
+func (t Type) String() string {
+	switch t {
+	case TypeNone:
+		return "None"
+	case TypeUndefined:
+		return "Undefined"
+	case TypeNull:
+		return "Null"
+	case TypeBoolean:
+		return "Boolean"
+	case TypeNumber:
+		return "Number"
+	case TypeString:
+		return "String"
+	case TypeObject:
+		return "Object"
+	case TypeBuffer:
+		return "Buffer"
+	case TypePointer:
+		return "Pointer"
+	case TypeLightFunc:
+		return "LightFunc"
+	default:
+		return "Unknown"
+	}
+}
+
+type functionIndex struct {
+	functions map[unsafe.Pointer]func(*Context) int
+	sync.RWMutex
+}
+
+type timerIndex struct {
+	c float64
+	sync.Mutex
+}
+
+func (t *timerIndex) get() float64 {
+	t.Lock()
+	defer t.Unlock()
+	t.c++
+	return t.c
+}
+
+func newFunctionIndex() *functionIndex {
+	return &functionIndex{
+		functions: make(map[unsafe.Pointer]func(*Context) int, 0),
+	}
+}
+
+func (i *functionIndex) add(fn func(*Context) int) unsafe.Pointer {
+	ptr := C.malloc(1)
+
+	i.Lock()
+	i.functions[ptr] = fn
+	i.Unlock()
+
+	return ptr
+}
+
+func (i *functionIndex) get(ptr unsafe.Pointer) func(*Context) int {
+	i.RLock()
+	fn := i.functions[ptr]
+	i.RUnlock()
+
+	return fn
+}
+
+func (i *functionIndex) delete(ptr unsafe.Pointer) {
+	i.Lock()
+	delete(i.functions, ptr)
+	i.Unlock()
+
+	C.free(ptr)
+}
+
+func (i *functionIndex) destroy() {
+	i.Lock()
+
+	for ptr, _ := range i.functions {
+		delete(i.functions, ptr)
+		C.free(ptr)
+	}
+	i.Unlock()
+}
+
+type ctxIndex struct {
+	sync.RWMutex
+	ctxs map[unsafe.Pointer]*Context
+}
+
+func (ci *ctxIndex) add(ctx *Context) unsafe.Pointer {
+
+	ci.RLock()
+	for ptr, ctxPtr := range ci.ctxs {
+		if ctxPtr == ctx {
+			ci.RUnlock()
+			return ptr
+		}
+	}
+	ci.RUnlock()
+
+	ci.Lock()
+	for ptr, ctxPtr := range ci.ctxs {
+		if ctxPtr == ctx {
+			ci.Unlock()
+			return ptr
+		}
+	}
+	ptr := C.malloc(1)
+	ci.ctxs[ptr] = ctx
+	ci.Unlock()
+
+	return ptr
+}
+
+func (ci *ctxIndex) get(ptr unsafe.Pointer) *Context {
+	ci.RLock()
+	ctx := ci.ctxs[ptr]
+	ci.RUnlock()
+	return ctx
+}
+
+func (ci *ctxIndex) delete(ctx *Context) {
+	ci.Lock()
+	for ptr, ctxPtr := range ci.ctxs {
+		if ctxPtr == ctx {
+			delete(ci.ctxs, ptr)
+			C.free(ptr)
+			ci.Unlock()
+			return
+		}
+	}
+	panic(fmt.Sprintf("context (%p) doesn't exist", ctx))
+}
+
+var contexts *ctxIndex
+
+func init() {
+	contexts = &ctxIndex{
+		ctxs: make(map[unsafe.Pointer]*Context),
+	}
+}