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Fix expression conversion #7165

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Description

This PR fixes an issue where the parser wouldn't attempt to convert an expression if Expression#canReturn(Class) returns true. Causing issues when an expression could return a certain type but doesn't once evaluated. For instance, adding two unset variables, which can potentially return variety of types (such as a string), and using the expression in a pattern that expects strings (e.g., formatted ({_foo} + {_bar}) would result in a stack trace being thrown because the array returned from the arithmetic expression wasn't converted to a string array.


Target Minecraft Versions: any
Requirements: none
Related Issues: #7164

@UnderscoreTud UnderscoreTud added the bug An issue that needs to be fixed. Alternatively, a PR fixing an issue. label Oct 27, 2024
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Will review in depth soon. tud and I discussed some potential issues/edge cases that still need fixed

UnderscoreTud and others added 7 commits November 8, 2024 16:47
We need to use conversion whenever there are multiple return types. If the expression does not accept our supertype, then we can attempt to convert it, which will already handle safety checks for multiple return types
This fixes SimpleExpression not converting  possible return types that are not contained in the desired types array. For example, if an expression can return a Number or a String, and we want an Expression that is a Number or an World, it will now include converters for String->Number and String->World
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5 participants