POP-2

POP-2
編程範型	函數式，堆疊導向
設計者	Robin Popplestone（英語：Robin Popplestone），Rod Burstall（英語：Rod Burstall）
釋出時間	1970年，54年前
啟發語言
	COWSEL（英語：COWSEL），ALGOL 60，ISWIM
影響語言
	POP-10，POP-11（英語：POP-11），ML

POP-2（也稱為POP2，Package for Online Programming：線上編程包），是Robin Popplestone（英語：Robin Popplestone）和Rod Burstall（英語：Rod Burstall）在大約1970年於愛丁堡大學開發的程式語言，起源於更早的語言POP-1（Robin Popplestone在1968年開發，最初叫做COWSEL（英語：COWSEL））^[1]。它根源於很多來源：LISP和ALGOL 60語言，和來自Peter J. Landin的理論上的想法。它使用增量編譯器，這給與它某些直譯語言的靈活性，包括允許在執行時間定義新函數，和在程式執行時修改函數定義（二者都是動態編譯的特徵），而沒有直譯語言的開銷。

影響

POP-2是具有動態繫結和動態（執行時間）確定類型的函數式語言，它的語法是ALGOL風格的，而它的特徵受到了Strachey和Landin工作的重大影響。它有一些顯著特徵，比如在部份應用中具有的一種形式的函數閉包，和受到Landin的J算子啟發的一種逃離線制（jumpout函數），它扮演了與Lisp中的catch/throw類似的角色。

POP-2對ML的設計有着重要的影響，這來自它的記錄結構，這裏定義了數據構造子和並以欄位名字作為選擇子，和它的section ... endsection指令，這是提供了初步模組性支援的一種簡單名字空間管理機制，ML後來把它替代為local ... in ... end。^[2]

參見

POP-11（英語：POP-11）程式語言
Poplog（英語：Poplog）編程環境

參照

^ 存档副本 (PDF). [2020-05-02]. （原始內容存檔 (PDF)於2012-10-03）.
^ David MacQueen, Robert Harper, John Reppy. The History of Standard ML (PDF). 2020 [2021-09-11]. （原始內容 (PDF)存檔於2022-02-13）. POP-2 was designed by Robin Popplestone and Burstall in the late 1960s [1977; 1968; 1968a], following on Popplestone’s earlier POP-1 language [1968b]. Like Lisp, POP-2 was a functional language with dynamic binding and dynamic (i.e., runtime) typing, but its syntax was in the ALGOL-style, and its features were heavily influenced by the work of Strachey and Landin. It had a number of notable features such as a form of function closure via partial application and an escape mechanism (the jumpout function) inspired by Landin’s J operator that plays a rôle similar to catch/throw in Lisp. The design of ML was also influenced by POP-2’s record structures and by its sections, a simple mechanism for name-space management that provided rudimentary support for modularity.

參考書目

P. M. Burstall, J. S. Collins. An Introduction to the POP-2 Programming Language (PDF). 1968 [2020-05-02]. （原始內容 (PDF)存檔於2012-10-03）.
R. Burstall, J. Collins, R. Popplestone. Programming in Pop-2 (PDF). Edinburgh: Edinburgh University Press. 1968 [2021-09-11]. （原始內容 (PDF)存檔於2021-09-11）.
R.M. Burstall, R.J. Popplestone. POP-2 Reference Manual (PDF). Department of Machine Intelligence and Perception, University of Edinburgh. 1968 [2021-09-11]. （原始內容 (PDF)存檔於2022-01-02）.

外部連結

The Early Development of POP（頁面存檔備份，存於互聯網檔案館）

[1] 存档副本 (PDF). [2020-05-02]. （原始內容存檔 (PDF)於2012-10-03）.

[2] David MacQueen, Robert Harper, John Reppy. The History of Standard ML (PDF). 2020 [2021-09-11]. （原始內容 (PDF)存檔於2022-02-13）. POP-2 was designed by Robin Popplestone and Burstall in the late 1960s [1977; 1968; 1968a], following on Popplestone’s earlier POP-1 language [1968b]. Like Lisp, POP-2 was a functional language with dynamic binding and dynamic (i.e., runtime) typing, but its syntax was in the ALGOL-style, and its features were heavily influenced by the work of Strachey and Landin. It had a number of notable features such as a form of function closure via partial application and an escape mechanism (the jumpout function) inspired by Landin’s J operator that plays a rôle similar to catch/throw in Lisp. The design of ML was also influenced by POP-2’s record structures and by its sections, a simple mechanism for name-space management that provided rudimentary support for modularity.

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