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Add section for error handling #116

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21 changes: 21 additions & 0 deletions docs/specification.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -227,6 +227,27 @@ Examples
search("\u2713", {"\u2713": "value"}) -> "value"


.. _errors:

Errors
======

Errors may be raised during the JMEspath evaluation process. How and when errors
are raised is implementation specific, but implementations should indicate to
the caller when errors have occurred.

The following errors are defined:

* ``invalid-type`` is raised when an invalid type is encountered during the
evaluation process.
* ``invalid-value`` is raised when an invalid value is encountered during the
evaluation process.
* ``unknown-function`` is raised when an unknown function is encountered during
the evaluation process.
* ``invalid-arity`` is raised when an invalid number of function arguments is
encountered during the evaluation process.


.. _subexpressions:

SubExpressions
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