HP 示例库 · Examples

hellomodule

Hello HP

程序入口、模块导入与基础算术。Entry point, module import and basic arithmetic.

helloworld.hp

module {
    "<std.io>"
}

fn main() {
    a: int = 1
    b: int = 2
    c: int = a + b
    std.io.print("Hello HP!", c)
}

features运算符

运算符全家桶

算术、位运算、比较、逻辑与复合赋值。Arithmetic, bitwise, comparison, logical and compound assignment.

test_features.hp

fn main() {
    a = 10
    b = a + 5
    p, q = 60, 13
    r = p & q       # 12
    r = p | q       # 61
    r = p ^ q       # 49
    r = p << 2      # 240
    n = 100
    n += 5          # 105
    print(10 > 5)   # true
    print(true and false)  # false
}

struct字段

结构体 Struct

值语义结构体与字段访问。Value-semantics struct with field access.

_t_struct.hp

struct Point {
    x: num
    y: num
}

fn main() {
    p = Point { x: 10, y: 20 }
    print(p.x)
    q = Point { x: 1, y: 2 }
    print(p.x + q.y)
}

enummatch

枚举与模式匹配

标签联合 + match 解构为字面量。Tagged union + match destructured to literals.

_t_enum.hp

enum Color { Red, Green, Blue }

fn main() {
    c = Color::Red
    name = match c {
        Color::Red   => "红色"
        Color::Green => "绿色"
        Color::Blue  => "蓝色"
    }
    print(name)
}

match通配

match 通配符

语句级 match 与 _ 默认臂。Statement-level match with the _ wildcard arm.

_t_match.hp

enum Color { Red, Green, Blue }

fn main() {
    c = Color::Green
    match c {
        Color::Red   => print(10)
        Color::Green => print(20)
        Color::Blue  => print(30)
    }
    n = 7
    desc = match n {
        1 => "一"
        2 => "二"
        _ => "其他"
    }
    print(desc)
}

switch范围

switch 范围匹配

整数范围、多值、左开/右开区间与 default。Integer ranges, multi-value, open/closed intervals and default.

_t_switch.hp

fn report(score: i32) {
    switch (score) {
        case 90..=100: print("优秀")
        case 80..89:   print("良好")
        case 60..69:   print("及格")
        case 0..59:    print("不及格")
        default:       print("无效分数")
    }
}

fn bucket(x: i32) {
    switch (x) {
        case ..0:  print("负")
        case 0..10: print("小")
        case 10..: print("大")
    }
}

interfaceimpl

接口与实现

trait 式接口 + impl 方法分派。Trait-style interface + impl method dispatch.

_t_interface.hp

interface Printable {
    fn print(self)
}

struct Document { title: str }

impl Printable for Document {
    fn print(self) {
        print("文档: " + self.title)
    }
}

fn main() {
    doc = Document { title: "HP 设计" }
    doc.print()
}

impl方法

结构体方法

为结构体附加方法与关联函数。Attach methods and associated functions to a struct.

_t_impl.hp

struct Point { x: num; y: num }

impl Point {
    fn add(self, other: Point) -> num {
        return self.x + other.x + self.y + other.y
    }
    fn make() -> Point {
        return Point { x: 1, y: 2 }
    }
}

fn main() {
    p = Point { x: 3, y: 4 }
    q = Point::make()
    print(p.add(q))
}

macro编译期

宏 Macro

编译期展开，不生成运行时代码。Expands at compile time, emits no runtime code.

_t_macro.hp

macro debug_print(msg) {
    print("DEBUG: " + msg)
}

fn test_macro() {
    debug_print("hello")
}

fn main() {
    test_macro()
}

deferRAII

defer 延迟执行

RAII 语法糖，作用域结束自动清理。RAII sugar — runs cleanup when scope ends.

_t_defer.hp

fn test_defer() {
    defer print("cleanup")
    print("main")
}

fn main() {
    test_defer()
}

namespace组织

命名空间

用 namespace 组织函数与类型。Organize functions and types with namespaces.

_t_namespace.hp

namespace utils {
    fn add(a: int, b: int) -> int {
        return a + b
    }
    fn multiply(a: int, b: int) -> int {
        return a * b
    }
}

fn main() {
    sum = utils.add(3, 4)
    prod = utils.multiply(2, 5)
    print(sum, prod)
}

arithmeticif

算术与分支

整数/浮点混合运算与条件分支。Mixed integer/float math with conditionals.

arithmetic.hp

module {
    "<std>"
}

fn main() {
    a = 10
    b = 20
    c = a + b
    std.io.print(c)

    d = 3.14
    e = 2.5
    f = d * e
    std.io.print(f)

    x = 42
    if x > 10 {
        std.io.print(1)
    } else {
        std.io.print(0)
    }
}

genericsstruct

泛型 Generic

泛型结构体与泛型函数，单态化在编译期完成，零运行时开销。Generic structs and functions — monomorphization happens at compile time, zero runtime cost.

generics.hp

struct Pair[T, U] {
    first: T
    second: U
}

fn swap[T, U](p: Pair[T, U]) -> Pair[U, T] {
    return Pair { first: p.second, second: p.first }
}

fn main() {
    p = Pair { first: 10, second: "hp" }
    q = swap(p)
    print(q.first, q.second)   # "hp" 10
}

concurrencyparallel

数据并行 Parallel

parallel for 编译期展开为静态分片，simd 提示生成向量化指令；spawn 编译为 OS 原生线程。parallel for expands to static slices at compile time; simd emits vectorized code; spawn becomes an OS thread.

concurrency.hp

fn main() {
    # 数据并行 + SIMD：编译期静态分片 + 向量化
    parallel for i in 1..9 simd {
        std.io.print(i * i)
    }

    # 任务并行：spawn 编译期为 OS 原生线程
    spawn fn() {
        std.io.print("来自新线程")
    }
}

json容器

JSON 字面量

原生 json 字面量，键/值访问，编译期已知类型、无解析运行时。Native json literals with homogeneous access — types known at compile time, no parse runtime.

json.hp

fn main() {
    user = {"name": "Alice", "age": 25, "tags": ["a", "b"]}
    print(user["name"])      # Alice
    print(user["age"] + 1)   # 26
    print(user["tags"][0])   # a
}

pipelinemap

管道处理 Pipeline

用 |> 把数据从左向右流过 filter / map，最后 sum 聚合。Pipe data left-to-right through filter / map, then aggregate with sum.

pipeline.hp

fn main() {
    nums = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
    evens   = nums |> filter(fn(x) { return x % 2 == 0 })
    squared = evens |> map(fn(x) { return x * x })
    total   = sum(squared)
    print(total)   # 120
}

f-string格式化

格式化字符串

f-string 在编译期展开为字符串拼接，运行时零格式化开销。f-strings expand to string concatenation at compile time — zero formatting cost at runtime.

fstring.hp

fn main() {
    name = "HP"
    version = 1.0
    count = 3
    msg = f"语言 {name} v{version} 有 {count} 个范式"
    print(msg)
    print(f"{count * count} = {count}²")
}

asyncawait

异步协程 Async

async fn 编译期为状态机结构体，await 转换为 poll 调用，事件循环由标准库提供。async fn becomes a state-machine struct at compile time; await becomes a poll call; the event loop is from the stdlib.

async.hp

async fn compute() -> i64 {
    return 6 * 7
}

fn main() {
    future = compute()
    answer = await future
    print(answer)   # 42
}

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