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alumman
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Joined: 25 Apr 2014
Posts: 2
Location: US
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Anyone have a source for a context free grammar for JCL?
Thanks!! |
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enrico-sorichetti
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Joined: 14 Mar 2007
Posts: 10873
Location: italy
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it will be very difficult to write a context free grammar
for a language that is NOT context free |
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alumman
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Joined: 25 Apr 2014
Posts: 2
Location: US
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Can you explain why JCL is not context free please?
Please excuse my ignorance; its been a long time since my language theory classes in school. |
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enrico-sorichetti
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Joined: 14 Mar 2007
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Location: italy
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| positional attributes/parms for example |
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daveporcelan
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Joined: 01 Dec 2006
Posts: 792
Location: Pennsylvania
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Please excuse my ignorance as well, but...
What is this grammar, with regards to JCL or any computer language?
What does context free grammar mean as well?
I know JCL pretty well, I learned it on punch cards in 1984! |
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Robert Sample
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Joined: 06 Jun 2008
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Location: Dubuque, Iowa, USA
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For a computer language, a grammar is a set of rules on how to produce strings in the language. There is no meaning attached to those strings -- the grammar merely describes how to produce the various language strings.
A context-free grammar is one where the context doesn't matter to the language generation; since JCL contains positional parameters (where context DOES matter), it cannot be context-free. |
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enrico-sorichetti
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