projects / OpenSPARC-T2-SAM / blame
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| 55 | <H2><A NAME="SECTION0020140000000000000000"></A><A NAME="AST_Errors"></A> | |
| 56 | <BR> | |
| 57 | 18.1.4 Exceptions and Error Handling | |
| 58 | </H2> | |
| 59 | ||
| 60 | <P> | |
| 61 | The parser module defines a single exception, but may also pass other | |
| 62 | built-in exceptions from other portions of the Python runtime | |
| 63 | environment. See each function for information about the exceptions | |
| 64 | it can raise. | |
| 65 | ||
| 66 | <P> | |
| 67 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4949' xml:id='l2h-4949' class="exception">ParserError</tt></b></dt> | |
| 68 | <dd> | |
| 69 | Exception raised when a failure occurs within the parser module. This | |
| 70 | is generally produced for validation failures rather than the built in | |
| 71 | <tt class="exception">SyntaxError</tt> thrown during normal parsing. | |
| 72 | The exception argument is either a string describing the reason of the | |
| 73 | failure or a tuple containing a sequence causing the failure from a parse | |
| 74 | tree passed to <tt class="function">sequence2ast()</tt> and an explanatory string. Calls to | |
| 75 | <tt class="function">sequence2ast()</tt> need to be able to handle either type of exception, | |
| 76 | while calls to other functions in the module will only need to be | |
| 77 | aware of the simple string values. | |
| 78 | </dd></dl> | |
| 79 | ||
| 80 | <P> | |
| 81 | Note that the functions <tt class="function">compileast()</tt>, <tt class="function">expr()</tt>, and | |
| 82 | <tt class="function">suite()</tt> may throw exceptions which are normally thrown by the | |
| 83 | parsing and compilation process. These include the built in | |
| 84 | exceptions <tt class="exception">MemoryError</tt>, <tt class="exception">OverflowError</tt>, | |
| 85 | <tt class="exception">SyntaxError</tt>, and <tt class="exception">SystemError</tt>. In these cases, these | |
| 86 | exceptions carry all the meaning normally associated with them. Refer | |
| 87 | to the descriptions of each function for detailed information. | |
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