add experimental class for json

git-svn-id: http://skia.googlecode.com/svn/trunk@2939 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
mike@reedtribe.org 2011-12-31 01:58:40 +00:00
parent 10afbefa5b
commit 41f1c46ddc
2 changed files with 315 additions and 0 deletions

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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkJSONObject_DEFINED
#define SkJSONObject_DEFINED
#include "SkTypes.h"
class SkString;
class SkJSONObject {
public:
SkJSONObject() : fHead(NULL), fTail(NULL) {}
~SkJSONObject();
enum Type {
kInvalid,
kObject,
kString,
kInt,
kFloat,
kBool,
};
void addString(const char name[], const char value[]);
void addInt(const char name[], int32_t value);
void addFloat(const char name[], float value);
void addBool(const char name[], bool value);
/**
* Add the value object to this object, taking over
* ownership of the value object.
*/
void addObject(const char name[], SkJSONObject* value);
Type find(const char name[], intptr_t* = NULL) const;
bool findString(const char name[], SkString* = NULL) const;
bool findInt(const char name[], int32_t* = NULL) const;
bool findFloat(const char name[], float* = NULL) const;
bool findBool(const char name[], bool* = NULL) const;
bool findObject(const char name[], SkJSONObject** = NULL) const;
void dump() const;
private:
struct Slot;
Slot* fHead;
Slot* fTail;
const Slot* findSlot(const char name[]) const;
const Slot* findSlotAndType(const char name[], Type) const;
Slot* addSlot(Slot*);
void dumpLevel(int level) const;
};
#endif

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src/utils/SkJSONObject.cpp Normal file
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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkJSONObject.h"
#include "SkString.h"
struct SkJSONObject::Slot {
Slot(const char name[], SkJSONObject::Type type) {
fNext = NULL;
size_t len = strlen(name);
char* str = new char[len + 2];
str[0] = (char)type;
memcpy(str + 1, name, len + 1);
fName = str;
// fValue is uninitialized
}
~Slot();
const char* name() const {
return fName ? &fName[1] : "";
}
SkJSONObject::Type type() const {
return fName ? (SkJSONObject::Type)fName[0]
: SkJSONObject::kInvalid;
}
Slot* fNext;
char* fName; // fName[0] is the type
union {
SkJSONObject* fObject;
char* fString;
int32_t fInt;
float fFloat;
bool fBool;
intptr_t fIntPtr; // for generic getter
} fValue;
};
SkJSONObject::Slot::~Slot() {
switch (this->type()) {
case SkJSONObject::kObject:
delete fValue.fObject;
break;
case SkJSONObject::kString:
delete[] fValue.fString;
break;
default:
break;
}
delete[] fName;
}
///////////////////////////////////////////////////////////////////////////////
SkJSONObject::~SkJSONObject() {
Slot* slot = fHead;
while (slot) {
Slot* next = slot->fNext;
delete slot;
slot = next;
}
}
SkJSONObject::Slot* SkJSONObject::addSlot(Slot* slot) {
SkASSERT(NULL == slot->fNext);
if (NULL == fHead) {
SkASSERT(NULL == fTail);
fHead = fTail = slot;
} else {
SkASSERT(fTail);
SkASSERT(NULL == fTail->fNext);
fTail->fNext = slot;
fTail = slot;
}
}
void SkJSONObject::addString(const char name[], const char value[]) {
Slot* slot = addSlot(new Slot(name, kString));
size_t len = strlen(value);
char* str = new char[len + 1];
memcpy(str, value, len + 1);
slot->fValue.fString = str;
}
void SkJSONObject::addInt(const char name[], int32_t value) {
Slot* slot = addSlot(new Slot(name, kInt));
fTail->fValue.fInt = value;
}
void SkJSONObject::addFloat(const char name[], float value) {
Slot* slot = addSlot(new Slot(name, kFloat));
fTail->fValue.fFloat = value;
}
void SkJSONObject::addBool(const char name[], bool value) {
Slot* slot = addSlot(new Slot(name, kBool));
fTail->fValue.fBool = value;
}
void SkJSONObject::addObject(const char name[], SkJSONObject* value) {
Slot* slot = addSlot(new Slot(name, kObject));
fTail->fValue.fObject = value;
}
///////////////////////////////////////////////////////////////////////////////
const SkJSONObject::Slot* SkJSONObject::findSlot(const char name[]) const {
for (const Slot* slot = fHead; slot; slot = slot->fNext) {
if (!strcmp(slot->name(), name)) {
return slot;
}
}
return NULL;
}
const SkJSONObject::Slot* SkJSONObject::findSlotAndType(const char name[],
Type t) const {
const Slot* slot = this->findSlot(name);
if (slot && (slot->type() != t)) {
slot = NULL;
}
return slot;
}
SkJSONObject::Type SkJSONObject::find(const char name[], intptr_t* value) const {
const Slot* slot = this->findSlot(name);
if (slot) {
if (value) {
*value = slot->fValue.fIntPtr;
}
return slot->type();
}
return kInvalid;
}
bool SkJSONObject::findString(const char name[], SkString* value) const {
const Slot* slot = this->findSlotAndType(name, kString);
if (slot) {
if (value) {
value->set(slot->fValue.fString);
}
return true;
}
return false;
}
bool SkJSONObject::findInt(const char name[], int32_t* value) const {
const Slot* slot = this->findSlotAndType(name, kInt);
if (slot) {
if (value) {
*value = slot->fValue.fInt;
}
return true;
}
return false;
}
bool SkJSONObject::findFloat(const char name[], float* value) const {
const Slot* slot = this->findSlotAndType(name, kFloat);
if (slot) {
if (value) {
*value = slot->fValue.fFloat;
}
return true;
}
return false;
}
bool SkJSONObject::findBool(const char name[], bool* value) const {
const Slot* slot = this->findSlotAndType(name, kBool);
if (slot) {
if (value) {
*value = slot->fValue.fBool;
}
return true;
}
return false;
}
bool SkJSONObject::findObject(const char name[], SkJSONObject** value) const {
const Slot* slot = this->findSlotAndType(name, kObject);
if (slot) {
if (value) {
*value = slot->fValue.fObject;
}
return true;
}
return false;
}
///////////////////////////////////////////////////////////////////////////////
static void tabForLevel(int level) {
for (int i = 0; i < level; ++i) {
SkDebugf(" ");
}
}
void SkJSONObject::dump() const {
SkDebugf("{\n");
this->dumpLevel(0);
SkDebugf("}\n");
}
void SkJSONObject::dumpLevel(int level) const {
for (Slot* slot = fHead; slot; slot = slot->fNext) {
Type t = slot->type();
if (kInvalid == t) {
continue;
}
tabForLevel(level + 1);
SkDebugf("\"%s\" : ", slot->name());
switch (slot->type()) {
case kObject: {
if (slot->fValue.fObject) {
SkDebugf("{\n");
slot->fValue.fObject->dumpLevel(level + 1);
tabForLevel(level + 1);
SkDebugf("}");
} else {
SkDebugf("null");
}
} break;
case kString:
SkDebugf("\"%s\"", slot->fValue.fString);
break;
case kInt:
SkDebugf("%d", slot->fValue.fInt);
break;
case kFloat:
SkDebugf("%g", slot->fValue.fFloat);
break;
case kBool:
SkDebugf("%s", slot->fValue.fBool ? "true" : "false");
break;
default:
SkASSERT(!"how did I get here");
break;
}
if (slot->fNext) {
SkDebugf(",");
}
SkDebugf("\n");
}
}