Talk:Compiler/Verifying syntax: Difference between revisions
Content added Content deleted
(Created page with "==Incorrect BNF== The BNF given does not permit = to be directly followed by not. Go/Julia/Perl all get that wrong.<br> The Go output also claims that "g not = h" is valid, wh...") |
mNo edit summary |
||
| Line 2: | Line 2: | ||
The BNF given does not permit = to be directly followed by not. Go/Julia/Perl all get that wrong.<br> |
The BNF given does not permit = to be directly followed by not. Go/Julia/Perl all get that wrong.<br> |
||
The Go output also claims that "g not = h" is valid, whereas Perl/Julia and now Phix call that invalid. --[[User:Petelomax|Pete Lomax]] ([[User talk:Petelomax|talk]]) 18:57, 3 January 2020 (UTC) |
The Go output also claims that "g not = h" is valid, whereas Perl/Julia and now Phix call that invalid. --[[User:Petelomax|Pete Lomax]] ([[User talk:Petelomax|talk]]) 18:57, 3 January 2020 (UTC) |
||
I may not understand the specification given for BNF syntax. Doesn't the rule: |
|||
expr_level_4 = ["not"] expr_level_5 [('=' | '<') expr_level_5] ; |
|||
mean any expr_level_5 expression can be preceded by not? |
|||
--[[User:Wherrera|Wherrera]] ([[User talk:Wherrera|talk]]) 19:09, 3 January 2020 (UTC) |
|||
Revision as of 19:09, 3 January 2020
Incorrect BNF
The BNF given does not permit = to be directly followed by not. Go/Julia/Perl all get that wrong.
The Go output also claims that "g not = h" is valid, whereas Perl/Julia and now Phix call that invalid. --Pete Lomax (talk) 18:57, 3 January 2020 (UTC)
I may not understand the specification given for BNF syntax. Doesn't the rule:
expr_level_4 = ["not"] expr_level_5 [('=' | '<') expr_level_5] ;
mean any expr_level_5 expression can be preceded by not? --Wherrera (talk) 19:09, 3 January 2020 (UTC)