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Alexandre Duret-Lutz authored
Spin 6 supports formulas such as []<>(a < b) so that atomic properties need not be specified using #define. Of course we don't want to implement all the syntax of Spin in our LTL parser because other tools may have different syntaxes for their atomic propositions. The lenient mode tells the scanner to return any (...), {...}, or {...}! block as a single token. The parser will try to recursively parse this block as a LTL/SERE formula, and if this fails, it will consider the block to be an atomic proposition. The drawback is that most syntax errors will no be considered to be atomic propositions. For instance (a U b U) is a single atomic proposition in lenient mode, and a syntax error in default mode. * src/ltlparse/ltlparse.yy, src/ltlparse/ltlscan.ll, src/ltlparse/parsedecl.hh, src/ltlparse/public.hh: Add a lenient parsing mode. Simplify the lexer using yy_scan_string. * src/bin/common_finput.cc: Add a --lenient option. * src/ltltest/lenient.test: New file. * src/ltltest/Makefile.am: Add it. * src/neverparse/neverclaimparse.yy: Parse the guards in lenient mode. * src/tgbatest/neverclaimread.test: Adjust. * src/ltlvisit/tostring.cc: When outputing a formula in Spin's syntax, output (a < b) instead of "a < b". * src/misc/escape.cc, src/misc/escape.hh (trim): New helper function.
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