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authorDavid Young <dyoung@hdfgroup.org>2021-03-15 13:16:22 (GMT)
committerGitHub <noreply@github.com>2021-03-15 13:16:22 (GMT)
commitf6d919a2ab0034a1ee76ca2d5f59f4d8114c4952 (patch)
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Simplified hl parsing (#399)
* Stop using global variables to share parse context with the lexer. The lexer uses an unconventional strategy for parsing lexical categories NUMBER (decimal numbers) and STRING (double-quoted strings) that involves sharing the parse context with the lexer using global variables. There are a couple of problems with that. First, the lexer is too complicated for the simple tokenization it performs—it's hard to tell if it is correct. Second, as @seanm points out, the shared global variables spill into the namespace shared by other libraries and application programs—e.g., VTK. * Regenerate source files from *.[yl]. * Replace strndup, which isn't available on Windows, with a custom routine, `trim_quotes`, that produces a copy of its `const char *` argument with leading and trailing double quotes ('"') removed. While I am here, remove the unnecessary statement `BEGIN INITIAL;`, which I should have deleted in a previous commit. * Regenerate .c from .l. * You haven't programmed in C until you have programmed in High-Definition (HD) C. * \#include "H5private.h" for HD* definitions. * Regenerate *.[ch] from *.[yl].
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