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FbLangRef25 Translators & Reviewers

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FbLangRef25 Translators & Reviewers

firebirdlists

To those currently reviewing and translating the Language Reference, I
have put up new PDF and HTML builds today - build 0.904 - and have
updated the sources in CVS - see the diff file I sent to the list.

These are small changes in the DDL and Commons chapters but they are
in sections that are marked as "already reviewed".

Cheers,
Helen


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Re: FbLangRef25 Translators & Reviewers

Simonov Denis
Helen Borrie <[hidden email]> wrote Wed, 27 Apr 2016 03:17:00 +0300:

Hello, Helen

I would like to say a few errors in the description of Operator Precedence.

Common Language Elements->Expressions->SQL Operators->Operator Precedence

1. Arithmetic Operators. Among the arithmetic operators of places without  
unary plus (+) and minus (-). They have a higher priority than  
multiplication and division.

Operator   Purpose     Precedence
----------------------------------
   +       Unary plus      1
   -       Unary minus     1
   *       Multiplication  2
   /       Division        2
   +       Addition        3
   -       Subtraction     3

2. Comparison Operators. All comparison operators have the same priority.  
Since Firebird 3.0.1. predicate IS has a higher priority than the other  
comparison operators. The Firebird 2.x predicate IS has the same priority  
as other comparison operators.

Operators Priorities can be found in parse.y

// precedence declarations for expression evaluation
%left OR
%left AND
%left NOT
%left '=' '<' '>' BETWEEN LIKE CONTAINING STARTING SIMILAR KW_IN NEQ GEQ  
LEQ NOT_GTR NOT_LSS
%left IS
%left '+' '-'
%left '*' '/'
%left UMINUS UPLUS
%left CONCATENATE
%left COLLATE

--
Cheers,
Simonov Denis

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