#17434: Preparser for symbolic functions ignores syntax errors
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Reporter: jdemeyer | Owner:
Type: defect | Status: new
Priority: minor | Milestone: sage-6.5
Component: misc | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by vbraun):
Ultimately, this shows why you shouldn't implement input transformations
with regular expressions. Sure it works, but you can only get so far. The
preparser knows nothing about grammar, so how can it find out about
misbalanced parens. We could try to kludge that on top (check that the
paren level never goes negative going from left to right) but that would
just be a bandaid, too.
The right fix (TM) is to either implement a full-blown Python+Sage parser
(lex/bison/ply/antlr/...) or hook into the built-in Python parser.
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Ticket URL: <http://trac.sagemath.org/ticket/17434#comment:1>
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