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Handle exceptions gracefully in command-line interface. Instead of [...]

To: ffc-dev@xxxxxxxxxx
From: ffc@xxxxxxxxxx
Date: Wed, 14 Sep 2005 22:22:27 +0200
Sender: Anders Logg <logg@xxxxxxxxxx>

Commit from logg (2005-09-14 22:22 CEST)
----------------

Handle exceptions gracefully in command-line interface. Instead of
just printing out the traceback, a hopefully informative error message
is now written.

Example:

    a = dot(grad(v), grad(v))*dx

generates the error message

*** Error at (dXa0/dx0)(dXa1/dx0) | ((d/dXa0)vi0)*((d/dXa1)vi0)*dX + (dXa0/dx1)(dXa1/dx1) | ((d/dXa0)vi0)*((d/dXa1)vi0)*dX
*** There can only be one test function.

  ffc  ChangeLog                            1.73
  ffc  src/bin/ffc                          1.19
  ffc  src/demo/Poisson.form                1.18
+ ffc  src/ffc/common/exceptions.py         1.1
  ffc  src/ffc/compiler/algebra.py          1.16
  ffc  src/ffc/compiler/compiler.py         1.24
  ffc  src/ffc/compiler/elementsearch.py    1.4
  ffc  src/ffc/compiler/elementtensor.py    1.14
  ffc  src/ffc/compiler/form.py             1.16
  ffc  src/ffc/compiler/integrator.py       1.15
  ffc  src/ffc/compiler/operators.py        1.6
  ffc  src/ffc/compiler/referencetensor.py  1.11
  ffc  src/ffc/compiler/reorder.py          1.6
  ffc  src/ffc/format/dolfin.py             1.36
  ffc  src/ffc/parser/simple.py             1.9