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Adding new extensions
bang edited this page Aug 18, 2015 · 3 revisions
##API
All extensions should extend JPExtension:
@interfaceJPExtension : NSObject + (void)main:(JSContext *)context; + (void *)formatPointerJSToOC:(JSValue *)val; + (id)formatPointerOCToJS:(void *)pointer; + (id)formatJSToOC:(JSValue *)val; + (id)formatOCToJS:(id)obj; + (int)sizeOfStructTypes:(NSString *)structTypes; + (void)getStructDataWidthDict:(void *)structDatadict:(NSDictionary *)dictstructDefine:(NSDictionary *)structDefine; + (NSDictionary *)getDictOfStruct:(void *)structDatastructDefine:(NSDictionary *)structDefine; @end##Add C function support
The +main: method in JPExtension will be executed when the extension added to JPEngine, so we can add JS methods in +main:.
The 4 formatXXX methods are used for translate types through OC and JS, use -formatPointerJSToOC: / -formatJSToOC: to convert params from JS to OC, use -formatPointerOCToJS: / -formatOCToJS: to convert return value from OC to JS. Example:
@interfaceJPMemory : JPExtension@end@implementationJPMemory + (void)main:(JSContext *)context { context[@"malloc"] = ^id(size_t size) { void *m = malloc(size); return [selfformatPointerOCToJS:m]; }; context[@"free"] = ^id(JSValue *jsVal) { void *m = [selfformatPointerJSToOC:jsVal]; free(m) }; } @endNow we can use malloc() and free() in JS:
require('JPEngine').addExtensions(['JPMemory'])varm=malloc(1024)free(m)