查看“仓颉 Hello”的源代码

=== Hello ===
 // Hello, World!
 func fun1(str1:String) {
    println("Output " + str1 + " from fun1.\n")
 }
 
 main() {
    var s1 = "Hello, World!"
    println(s1)
    fun1("test")
 }

 # compile
 cjc hello.cj -o hello
 # hello 793664(VSCode: 795384)

 # result
 Hello, World!
 Output test from fun1.

=== C function ===
* 将调用的函数在 foreign 中定义，基本变量类型改为仓颉类型，变长用 ... 表达
* 结构体定义 @C
* 使用时，用 unsafe{}
编译时，会使用 C 库，如：gcc lib path: /lib/gcc/x86_64-linux-gnu/9。用 cjc ... -V 查看。

 <small>foreign {
     func srand(n: Int32): Unit
     func time(): Int32
     func rand(): Int32
 }
 
 main() {
    unsafe {
       var n1:Int32 = time()
       srand(n1)
    }
 
    let r1 = unsafe {
       rand()
    }
    println(r1)
 }</small>

=== 封装 C function ===
 <small>// foreign 中不允许重复引用函数
 // 建议每个引用函数单独一行
 foreign {func srand(n: Int32): Unit}
 foreign {func time(): Int32}
 foreign {func rand(): Int32}
 
 public func urand(): UInt32 {
     unsafe {
         var n1:Int32 = time()
         srand(n1)
     }
 
     let r1 = unsafe {
         rand()
     }
     UInt32(r1)
 }

 main() {
     var n1 = urand()
     println(n1)
 }</small>

=== 封装 C function struct ===
调用方式类似类方法
 <small>foreign {func srand(n: Int32): Unit}
 foreign {func time(): Int32}
 foreign {func rand(): Int32}
 public struct UDEF {
     //-- rand    
     public func urand(): UInt32 {
         unsafe {
             var n1:Int32 = time()
             srand(n1)
         }
     
         let r1 = unsafe {
             rand()
         }
         UInt32(r1)
     }
     //== rand
 }

 main() {
     var udef1 = UDEF()
     var n1 = udef1.urand()
     println(n1)
 }</small>

=== 打包 ===
 cjpm init UDEF usys --type=static
 cjpm build

# 第一步会生成 module.json 文件，生成 src 目录
# 在第二步前，将 usys.cj 放入 src
# 第二步执行后，在 release 中生成 usys 目录及相应 .cjo 文件

 {
   "cjc_version": "0.45.2",
   "organization": "UDEF",
   "name": "usys",
   "description": "nothing here",
   "version": "1.0.0",
   "build_dir": "",
   "src_dir": "",
   "dependencies": {},
   "requires": {},
   "dev_requires": {},
   "package_requires": {
     "path_option": [],
     "package_option": {}
   },
   "foreign_requires": {},
   "output_type": "static",
   "command_option": "",
   "condition_option": {},
   "link_option": "",
   "cross_compile_configuration": {},
   "scripts": {},
   "package_configuration": {},
   "lto": ""
 }

 src
 usys.cj

 build/release/usys/UDEF.cjo
 build/release/usys/libusys_UDEF.a
 build/release/usys/incremental-cache.json


[[分类:Develop]]
[[分类:国产开发语言]]