On Tue, 28 Aug 2012 13:21:14 -0400, John Gilmore wrote: >Other people's parsing machinery is, in my experience, usable only for >context-free 'languages'; and since I devise and use only >context-sensitive--yes, PL/I-like--languages, I have found that I must >build my own parsing machinery; and this is easy enough to do using >REXX. > No language that requires identifiers to be declared is context-free, though some phrases in such languages may be parsed by context-unaware machinery, usually subject to availability of a symbol table. In effect, the symbol table converts declared identifiers to terminal symbols in the parser's view.
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