Context Sensitive Lexer #1054
Context Sensitive Lexer #1054
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marcioAlmada
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in_class is an unsigned int ... I would be very surprised if it became smaller than zero ;)
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I made a test with static unsigned int in_class = -1; and it caused strange bugs without errors here :P
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I removed the unsigned and kept the assertion because it's currently not very obvious to detect bugs if somebody decrements in_class in wrong conditions.
marcioAlmada
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It's great idea! |
marcioAlmada
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I have a question though, does this also apply to classes, interfaces or traits, or only to properties, methods and constants? Lets say if scalar type hinting is passed and the scalar names become reserved words, while I have an Int class and a String class. Will this RFC solve the problem? |
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Hi,
No. I tried a more ambitious RFC before that targeted namespaces, classes, A pure lexical approach, without significant changes on the lexer Anyway, the current solution is a great start and already mitigates a lot
Hope that's useful information. Thanks, |
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I see, thanks for your response, I will be looking forward to the more ambitious case-sensitive patch too. It's unfortunate that scalar names will become reserved words, I have mixed feelings about scalar type hinting. Part of me like it since its a step towards strongly typed PHP I was hoping for, but reserving scalar types makes it inconvenient for me. I know Levi Morrison proposed reserve some types in PHP 7, I am okay with his proposal though as I fully understand why this may be necessary. |
marcioAlmada
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Is the distinction between the individual reserved keywords really relevant here? It look to me like it would be good enough to just return a boolean from the check.
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It could be useful in case one wants to check for a specific identifier to give more specialized err messages, like: https://github.com/php/php-src/pull/1054/files#diff-3a8139128d4026ce0cb0c86beba4e6b9R4511
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I've seen the error message check, but the distinction seems really weird there ... it's pretty much the same message with slightly different wording. That does not seem worthwhile.
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What about const FOO = [1, isset(BAR[0])]; will the isset be lexed as T_ISSET or as T_STRING? It should be a T_ISSET. We currently don't support any language constructors in constants I think, but that's just because they don't happen to be implemented, we may want to add them in the future.
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T_ISSET because the ST_LOOKING_FOR_SR_NAME pops itself after first match so in const FOO = [1, isset(BAR[0])]; only FOO will be the T_STRING.
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Not sure I understand your response. In that case in_class and in_const_list should be 1, so that would push LOOKING_FOR_SR_NAME after the , - or not? How does it distinguish between A = 1, B = 2 and A = [1, B] for example?
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OK. Fixed with marcioAlmada@a8b1f21. Thanks ^^
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superseded by #1158 |
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This aims to be a consistent implementation of semi-reserved words grammar on OO context and OO access context.
RFC: https://wiki.php.net/rfc/context_sensitive_lexer