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Stropping (syntax)
In computer language design, stropping is a method of explicitly marking letter sequences as having a special property such as being a keyword or certain type of variable or storage location, and thus inhabiting a different namespace from ordinary names ("identifiers"), avoiding clashes. Stropping is not used in most modern languages – instead, keywords are reserved words and cannot be used as identifiers. Stropping allows the same letter sequence to be used both as a keyword and as an identifier, and simplifies parsing in that case – for example allowing a variable named if without clashing with the keyword if.
Stropping is primarily associated with ALGOL and related languages in the 1960s. Though it finds some modern use, it is easily confused with other similar techniques that are superficially similar.
==History==
The method of stropping and the term "stropping" arose in the development of ALGOL in the 1960s, where it was used to represent typographical distinctions (boldface and underline) found in the publication language which could not directly be represented in the hardware language – a typewriter could have bold characters, but in encoding in punch cards there were no bold characters. The term "stropping" arose in ALGOL 60, from "apostrophe", as some implementations of ALGOL 60 used apostrophes around text to indicate boldface,〔''Proceedings of an International Conference on ALGOL 68 Implementation: Department of Computer Science, University of Manitoba, Winnipeg, June 18–20, 1974,'' ed. Peter R. King, University of Manitoba. Dept. of Computer Science, p. (148 ) – More serious problems are posed by "stropping," the technique used to distinguish boldface text from roman text. Some implementations demand apostrophes around boldface (whence the name stropping); others require backspacing and underlining; ...〕 such as 'if' to represent the keyword if. Stropping is also important in ALGOL 68, where multiple methods of stropping, known as "stropping regimes", are used; the original matched apostrophes from ALGOL 60 was not widely used, with a leading period or uppercase being more common,〔''Revised Report,'' p. 123, footnote〕 as in .IF or IF and the term "stropping" was applied to all of these.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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