API/JSBase.h

   1 /*
   2  * Copyright (C) 2006 Apple Inc.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef JSBase_h
  27 #define JSBase_h
  28
  29 #ifndef __cplusplus
  30 #include <stdbool.h>
  31 #endif
  32
  33 #ifdef __OBJC__
  34 #import <Foundation/Foundation.h>
  35 #endif
  36
  37 /* JavaScript engine interface */
  38
  39 /*! @typedef JSContextGroupRef A group that associates JavaScript contexts with one another. Contexts in the same group may share and exchange JavaScript objects. */
  40 typedef const struct OpaqueJSContextGroup* JSContextGroupRef;
  41
  42 /*! @typedef JSContextRef A JavaScript execution context. Holds the global object and other execution state. */
  43 typedef const struct OpaqueJSContext* JSContextRef;
  44
  45 /*! @typedef JSGlobalContextRef A global JavaScript execution context. A JSGlobalContext is a JSContext. */
  46 typedef struct OpaqueJSContext* JSGlobalContextRef;
  47
  48 /*! @typedef JSStringRef A UTF16 character buffer. The fundamental string representation in JavaScript. */
  49 typedef struct OpaqueJSString* JSStringRef;
  50
  51 /*! @typedef JSClassRef A JavaScript class. Used with JSObjectMake to construct objects with custom behavior. */
  52 typedef struct OpaqueJSClass* JSClassRef;
  53
  54 /*! @typedef JSPropertyNameArrayRef An array of JavaScript property names. */
  55 typedef struct OpaqueJSPropertyNameArray* JSPropertyNameArrayRef;
  56
  57 /*! @typedef JSPropertyNameAccumulatorRef An ordered set used to collect the names of a JavaScript object's properties. */
  58 typedef struct OpaqueJSPropertyNameAccumulator* JSPropertyNameAccumulatorRef;
  59
  60
  61 /* JavaScript data types */
  62
  63 /*! @typedef JSValueRef A JavaScript value. The base type for all JavaScript values, and polymorphic functions on them. */
  64 typedef const struct OpaqueJSValue* JSValueRef;
  65
  66 /*! @typedef JSObjectRef A JavaScript object. A JSObject is a JSValue. */
  67 typedef struct OpaqueJSValue* JSObjectRef;
  68
  69 /* JavaScript symbol exports */
  70 /* These rules should stay the same as in WebKit2/Shared/API/c/WKBase.h */
  71
  72 #undef JS_EXPORT
  73 #if defined(JS_NO_EXPORT)
  74 #define JS_EXPORT
  75 #elif defined(__GNUC__) && !defined(__CC_ARM) && !defined(__ARMCC__)
  76 #define JS_EXPORT __attribute__((visibility("default")))
  77 #elif defined(WIN32) || defined(_WIN32) || defined(_WIN32_WCE) || defined(__CC_ARM) || defined(__ARMCC__)
  78 #if defined(BUILDING_JavaScriptCore) || defined(STATICALLY_LINKED_WITH_JavaScriptCore)
  79 #define JS_EXPORT __declspec(dllexport)
  80 #else
  81 #define JS_EXPORT __declspec(dllimport)
  82 #endif
  83 #else /* !defined(JS_NO_EXPORT) */
  84 #define JS_EXPORT
  85 #endif /* defined(JS_NO_EXPORT) */
  86
  87 #ifdef __cplusplus
  88 extern "C" {
  89 #endif
  90
  91 /* Script Evaluation */
  92
  93 /*!
  94 @function JSEvaluateScript
  95 @abstract Evaluates a string of JavaScript.
  96 @param ctx The execution context to use.
  97 @param script A JSString containing the script to evaluate.
  98 @param thisObject The object to use as "this," or NULL to use the global object as "this."
  99 @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.
 100 @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.
 101 @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.
 102 @result The JSValue that results from evaluating script, or NULL if an exception is thrown.
 103 */
 104 JS_EXPORT JSValueRef JSEvaluateScript(JSContextRef ctx, JSStringRef script, JSObjectRef thisObject, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception);
 105
 106 /*!
 107 @function JSCheckScriptSyntax
 108 @abstract Checks for syntax errors in a string of JavaScript.
 109 @param ctx The execution context to use.
 110 @param script A JSString containing the script to check for syntax errors.
 111 @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.
 112 @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.
 113 @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.
 114 @result true if the script is syntactically correct, otherwise false.
 115 */
 116 JS_EXPORT bool JSCheckScriptSyntax(JSContextRef ctx, JSStringRef script, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception);
 117
 118 /*!
 119 @function JSGarbageCollect
 120 @abstract Performs a JavaScript garbage collection.
 121 @param ctx The execution context to use.
 122 @discussion JavaScript values that are on the machine stack, in a register,
 123  protected by JSValueProtect, set as the global object of an execution context,
 124  or reachable from any such value will not be collected.
 125
 126  During JavaScript execution, you are not required to call this function; the
 127  JavaScript engine will garbage collect as needed. JavaScript values created
 128  within a context group are automatically destroyed when the last reference
 129  to the context group is released.
 130 */
 131 JS_EXPORT void JSGarbageCollect(JSContextRef ctx);
 132
 133 #ifdef __cplusplus
 134 }
 135 #endif
 136
 137 /* Enable the Objective-C API for platforms with a modern runtime. */
 138 #if !defined(JSC_OBJC_API_ENABLED)
 139 #define JSC_OBJC_API_ENABLED (defined(__clang__) && defined(__APPLE__) && ((defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1090 && !defined(__i386__)) || (defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE)))
 140 #endif
 141
 142 #endif /* JSBase_h */