蔡学镛 Rebol漫谈

REB L漫谈Programming Is Fun Again

支付宝 蔡学镛

REBOL的劣势

完美主义导致发展进度缓慢

对僵化的脑袋来说，这语言有点别扭

远远超出他们的理解

加上核心代码没有开源

好文档相当欠缺

用户与市场需求相当小

0.0000001%

REBOL的优势

不需要一堆文件与配置

体积超级小…

能做的事却不少

而且很容易就可做到(嗯…上手以后啦)

是当今DSL能力最强的语言

很适合开发抛弃式程序

或者快速打造原型系统

跨越多个主流平台

不可思议的简短代码示例

REBOL[]

View Layout [

Title "Hello"

Btn "OK" [

Quit

]

]

视窗程序居然这么简短

print read http://www.rebol.com

下载并打印某网页内容

view layout [

u: field "[email protected]"

h: field "http://"

btn "Send" [

send to-email u/text

read to-url h/text

alert "Sent“

]

]

开启视窗、读取网页、邮寄出去

foreach file load %./ [

if not dir? file [

write/binary join

ftp://user:[email protected]/

file

read/binary file

]

]

FTP上传所有文件

repeat n 100 [

if not error? try [

close open probe

join tcp://localhost: n

] [

print [n "is open"]

]

]

TCP端口扫描

remove-each tag page:

load/markup http://www.rebol.com

[ tag? Tag ]

write %page.txt page

将网页存成文件

view layout [

origin 0

t: h1 red black (to string! now/time)

rate 1

feel [

engage: [

t/text: now/time

show t

]

]

]

数字钟

view l: layout [

origin 0x0

b: box "Load" [

error? try [

b/image: i:

load first request-file

b/text: ""

l/size: b/size:

i/size show l

]

]

]

图片浏览器

REBOL把事情变简单!

1. 下载、更新，简单！

2. 安装，简单！

3. 不用依赖一堆文件，简单！

4. 编写代码，简单！

4. 移植到其他平台，简单！

5. 维护，简单！

When It Comes to Programming, Are You A

R E B E L ?[`rebl]

Stand up for Simplicityand Flexibility, Against Software

Complexity and Software

Obesity, and Want to

Program with Fun.

Hay! You Got to Try Java

!!!

R E B O L

E

L

A

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V

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X

P

R

E

S

S

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O

N

A

S

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D

B

J

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C

T

A

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G

U

A

G

E

S T A N D S

F O R

As A Java Programmer, You Know Objects Already.

But Relative Expression?

can • 助动词 / 能

• 名词 / 罐

• 动词 / 装罐

Relative-Expression=>Context-Sensitive Code

Carl Sassenrath, The REBOL Creator

3 Ways to Run REBOL Scripts

Operating System

REBOLInterpreter

REBOLScript

REBOLInterpreter

REBOLScript

REBOLinteractive Interpreter

REBOLScript

Portable Scripts

Operating System

REBOL Interpreter

REBOL Script

Operating System

REBOL Interpreter

Windowing

Drawing

Networking

Database Accessing

Web Browser Plug-In

External Lib Interface

All In One, One For All

Data Types You Can Imagine

datatype value

Int! 1

Decimal! 3.1416

Char! #"A"

Logic! True

String! "ABC"

>> ? 1

1 is an integer

>> ? 3.1416

3.1416 is a decimal

>> ? #"A"

#"A" is a char

>> ? True

TRUE is a logic of value: true

>> Type? "ABC"

== string!

Data Types You Cannot Imagine

datatypeURL value

Email! [email protected]

Percent! 32%

Tag! <IMG>

Date! 2009-7-21

Time! 18:00

File! %gdi32.dll

Tuple! 127.0.0.1

URL! http://www.abc.com/

. . . More . . .

Any-TypeSeries

Scalar

Number

Any-Word

Any-String

Any-FunctionAny-Block

REBOL Data Types (& Type Sets)Char!

// Pseudo-Code

// Include This and That

// Declare This and That

// ...

Class MyApp {

MyApp () {

// …

}

void action() {

System.quit();

}

void layout() {

Label title = new Label("Hello")

Button btn = new Button("OK");

btn.Click = action;

Window win = new Window();

win.add(btn);

win.add(btn);

win.show();

}

}

REBOL[]

View Layout [

Title "Hello"

Btn "OK" [

Quit

]

]

Maintain

Writeable

Succinct

Literals Dialecting

Parsing

Abstraction

Bug-Free

Readable

GUI

Finance

Database

. . .

Functions

• Extends REBOL

• Are DLLs

• Can Be in C or REBOL

• Only in REBOL 3.0

REBOL Plug-ins

REBOL in Web Server

• CGI (Common Gateway Interface)

• Fast-CGI

• Cheyenne Web Server (300 KB Only)

• REBOL Server Pages (RSP)

REBOL 3.0 SupportsUnicode• String is in Unicode.

• Both In Core and In View

• Will Support Multi CharSets

REBOL/Services (SOA Lite)

XML? Nah! Dialects are Better.

REBOL/Code

• Talk to REBOL VM Directly

• With Great Performance

• REBOL Dialecting Technology

When to Use REBOL

Spider

MobileAgent

InstanceMessenger

Dialect

ArtificialIntelligence

TextProcessing