Fix a number of errors in loops #308
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… special variables in expressions
… `SwitchIfOps.switchCases` PerlCompiler implements SwitchIfOps so this call already was performed
…et in `CommonReads.attrParse0`
…d here If that not the case, then a bug in compiler is present. Exception is better rather than generating incorrect code
…e it only can be used We do not want that type validation calculate type of actually undefined variable
Previous behavior (everything with 1 in last column was fixed): |Language|Initial|Incremented|`_index` of first iteration |--------|-------|-----------|--------------------------- |C++ |0 |before |1 |C# |0 |before |1 |Go |1 |after |1 |Java |0 |before |1 |JS |0 |before |1 |Lua |0 |after |0 |Nim |0? |after |0 (variable declared without initializer) |Perl |- |- |- (variable was not declared) |PHP |0 |before |1 |Python |0 |after |0 |Ruby |0 |before |1 |Rust |0 |before |1 Fixes kaitai-io/kaitai_struct#958
…ndRepeatExprHeader` and `condRepeatExprFooter`
…_io` is redefined
…dRepeatEosHeader` and `condRepeatEosFooter`
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This PR the result of revision of how generation of repeated attributes is implemented due to which a number of bugs was found and fixed:
TypeValidatorincorrectly define_variable for all kinds of loops, but it is generated only forrepeat-untilloopsrepeat-exprloops on each iteration, whereas other languages performs such calculations only once. Now they are also calculate count only once_indexvariable inrepeat: eosloopsio: ...is usedThis PR supersedes #234
Also, some refactoring was done: removed unused parameters and documented methods that generates loops.
Besides,
_currentIteratorTypewas renamed to_lastParsedType(this is the variable that holds type of the_variable in expression language) because it is used also invalid: exprkey to refer to the element that just was parsed.