Talk:Compiler/syntax analyzer: Difference between revisions
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because | is lower precedence than concatenation. |
because | is lower precedence than concatenation. |
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Yep, I agree. It has been corrected. Thanks for the catch! |
Yep, I agree. It has been corrected. Thanks for the catch! --[[User:Ed Davis|Ed Davis]] ([[User talk:Ed Davis|talk]]) 18:19, 22 April 2019 (UTC) |
Revision as of 18:20, 22 April 2019
Unary operator precedence
In the grmmmar, the definition of primary is:
primary = Identifier | Integer | '(' expr ')' | ('+' | '-' | '!') expr ;
which makes the unary operators the lowest precedence? Should that be:
primary = Identifier | Integer | '(' expr ')' | ('+' | '-' | '!') primary ;
which would be more usual? If I read it correctly, the C reference implementation does treat unary operators as highest precedence. --Tigerofdarkness (talk) 08:46, 23 October 2016 (UTC)
You are correct. Thanks for catching this! I have modified the grammar. --Ed Davis (talk) 11:03, 23 October 2016 (UTC)
prt_list production incorrect
I think the prt_list production should be:
prt_list = (String | expr) { ',' (String | expr) } ;
because | is lower precedence than concatenation.
Yep, I agree. It has been corrected. Thanks for the catch! --Ed Davis (talk) 18:19, 22 April 2019 (UTC)