/*
 * Copyright (C) 2006 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef JSBase_h
#define JSBase_h

#ifndef __cplusplus
#include <stdbool.h>
#endif

#ifdef __OBJC__
#import <Foundation/Foundation.h>
#endif

/* JavaScript engine interface */

/*! @typedef JSContextGroupRef A group that associates JavaScript contexts with one another. Contexts in the same group may share and exchange JavaScript objects. */
typedef const struct OpaqueJSContextGroup* JSContextGroupRef;

/*! @typedef JSContextRef A JavaScript execution context. Holds the global object and other execution state. */
typedef const struct OpaqueJSContext* JSContextRef;

/*! @typedef JSGlobalContextRef A global JavaScript execution context. A JSGlobalContext is a JSContext. */
typedef struct OpaqueJSContext* JSGlobalContextRef;

/*! @typedef JSStringRef A UTF16 character buffer. The fundamental string representation in JavaScript. */
typedef struct OpaqueJSString* JSStringRef;

/*! @typedef JSClassRef A JavaScript class. Used with JSObjectMake to construct objects with custom behavior. */
typedef struct OpaqueJSClass* JSClassRef;

/*! @typedef JSPropertyNameArrayRef An array of JavaScript property names. */
typedef struct OpaqueJSPropertyNameArray* JSPropertyNameArrayRef;

/*! @typedef JSPropertyNameAccumulatorRef An ordered set used to collect the names of a JavaScript object's properties. */
typedef struct OpaqueJSPropertyNameAccumulator* JSPropertyNameAccumulatorRef;

/*! @typedef JSTypedArrayBytesDeallocator A function used to deallocate bytes passed to a Typed Array constructor. The function should take two arguments. The first is a pointer to the bytes that were originally passed to the Typed Array constructor. The second is a pointer to additional information desired at the time the bytes are to be freed. */
typedef void (*JSTypedArrayBytesDeallocator)(void* bytes, void* deallocatorContext);

/* JavaScript data types */

/*! @typedef JSValueRef A JavaScript value. The base type for all JavaScript values, and polymorphic functions on them. */
typedef const struct OpaqueJSValue* JSValueRef;

/*! @typedef JSObjectRef A JavaScript object. A JSObject is a JSValue. */
typedef struct OpaqueJSValue* JSObjectRef;

/* Clang's __has_declspec_attribute emulation */
/* https://clang.llvm.org/docs/LanguageExtensions.html#has-declspec-attribute */

#ifndef __has_declspec_attribute
#define __has_declspec_attribute(x) 0
#endif

/* JavaScript symbol exports */
/* These rules should stay the same as in WebKit/Shared/API/c/WKDeclarationSpecifiers.h */

#undef JS_EXPORT
#if defined(JS_NO_EXPORT)
#define JS_EXPORT
#elif defined(WIN32) || defined(_WIN32) || defined(__CC_ARM) || defined(__ARMCC__) || (__has_declspec_attribute(dllimport) && __has_declspec_attribute(dllexport))
#if defined(BUILDING_JavaScriptCore) || defined(STATICALLY_LINKED_WITH_JavaScriptCore)
#define JS_EXPORT __declspec(dllexport)
#else
#define JS_EXPORT __declspec(dllimport)
#endif
#elif defined(__GNUC__)
#define JS_EXPORT __attribute__((visibility("default")))
#else /* !defined(JS_NO_EXPORT) */
#define JS_EXPORT
#endif /* defined(JS_NO_EXPORT) */

#ifdef __cplusplus
extern "C" {
#endif

/* Script Evaluation */

/*!
@function JSEvaluateScript
@abstract Evaluates a string of JavaScript.
@param ctx The execution context to use.
@param script A JSString containing the script to evaluate.
@param thisObject The object to use as "this," or NULL to use the global object as "this."
@param sourceURL A JSString containing a URL for the script's source file. This is used by debuggers and when reporting exceptions. Pass NULL if you do not care to include source file information.
@param startingLineNumber An integer value specifying the script's starting line number in the file located at sourceURL. This is only used when reporting exceptions. The value is one-based, so the first line is line 1 and invalid values are clamped to 1.
@param exception A pointer to a JSValueRef in which to store an exception, if any. Pass NULL if you do not care to store an exception.
@result The JSValue that results from evaluating script, or NULL if an exception is thrown.
*/
JS_EXPORT JSValueRef JSEvaluateScript(JSContextRef ctx, JSStringRef script, JSObjectRef thisObject, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception);

/*!
@function JSCheckScriptSyntax
@abstract Checks for syntax errors in a string of JavaScript.
@param ctx The execution context to use.
@param script A JSString containing the script to check for syntax errors.
@param sourceURL A JSString containing a URL for the script's source file. This is only used when reporting exceptions. Pass NULL if you do not care to include source file information in exceptions.
@param startingLineNumber An integer value specifying the script's starting line number in the file located at sourceURL. This is only used when reporting exceptions. The value is one-based, so the first line is line 1 and invalid values are clamped to 1.
@param exception A pointer to a JSValueRef in which to store a syntax error exception, if any. Pass NULL if you do not care to store a syntax error exception.
@result true if the script is syntactically correct, otherwise false.
*/
JS_EXPORT bool JSCheckScriptSyntax(JSContextRef ctx, JSStringRef script, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception);

/*!
@function JSGarbageCollect
@abstract Performs a JavaScript garbage collection.
@param ctx The execution context to use.
@discussion JavaScript values that are on the machine stack, in a register,
 protected by JSValueProtect, set as the global object of an execution context,
 or reachable from any such value will not be collected.

 During JavaScript execution, you are not required to call this function; the
 JavaScript engine will garbage collect as needed. JavaScript values created
 within a context group are automatically destroyed when the last reference
 to the context group is released.
*/
JS_EXPORT void JSGarbageCollect(JSContextRef ctx);

#ifdef __cplusplus
}
#endif

/* Enable the Objective-C API for platforms with a modern runtime. NOTE: This is duplicated in VM.h. */
#if !defined(JSC_OBJC_API_ENABLED)
#if (defined(__clang__) && defined(__APPLE__) && (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) || (defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE)))
#define JSC_OBJC_API_ENABLED 1
#else
#define JSC_OBJC_API_ENABLED 0
#endif
#endif

#if JSC_OBJC_API_ENABLED
#define JSC_CF_ENUM(enumName, ...)       \
    typedef CF_ENUM(uint32_t, enumName) { \
        __VA_ARGS__                       \
    }
#else
#define JSC_CF_ENUM(enumName, ...) \
    typedef enum {                  \
        __VA_ARGS__                 \
    } enumName
#endif

#if JSC_OBJC_API_ENABLED
#define JSC_ASSUME_NONNULL_BEGIN _Pragma("clang assume_nonnull begin")
#define JSC_ASSUME_NONNULL_END _Pragma("clang assume_nonnull end")
#else
#define JSC_ASSUME_NONNULL_BEGIN
#define JSC_ASSUME_NONNULL_END
#endif

#if JSC_OBJC_API_ENABLED
#define JSC_NULL_UNSPECIFIED _Null_unspecified
#define JSC_NULLABLE _Nullable
#define JSC_NONNULL _Nonnull
#else
#define JSC_NULL_UNSPECIFIED
#define JSC_NULLABLE
#define JSC_NONNULL
#endif

#endif /* JSBase_h */
