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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Sat, 13 Oct 2012 23:49:59 +0200
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Subject: Re: What's a good Javascript book?
Newsgroups: comp.lang.javascript
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Patricia Shanahan wrote:

> Thomas 'PointedEars' Lahn wrote:
>> Patricia Shanahan wrote:
>>> John G Harris wrote:
>>>> Patricia Shanahan wrote:
>>>>   <snip>
>>>>> According to the grammar in
>>>>> http://www.ecma-international.org/ecma-262/5.1/, Statement can be
>>>>> expanded to Block, so some blocks are statements. On the other hand,
>>>>> there are contexts which require Block rather than Statement, for
>>>>> example in a TryStatement. A block that appears where a statement is
>>>>> not permitted cannot be a statement.
>>>>   <snip>
>>>>
>>>> I don't agree with your reasoning there. The standard says 'try' must
>>>> be followed by a block statement. If it said that 'try' must be
>>>> followed by

(sic!)

BTW, interrupting others in the midst of a sentence is not good quoting 
style either.

>>> Could you give me a reference for where you are getting the phrase
>>> "block statement"?
>>>
>>> I've searched both http://www.ecma-international.org/ecma-262/5.1/ and a
>>> recently downloaded copy of
>>> http://www.ecma-international.org/publications/files/ECMA
>>> ST/Ecma-262.pdf, and without finding the phrase. Maybe there is some
>>> other document I should be consulting. If so, please give me a pointer.
>> 
>> Section "12.1 Block" of the ECMAScript Language Specification, 5.1
>> Edition (and all previous Editions; section numbering may differ) is a
>> subsection of section "12 Statements".  That, the productions for the
>> /Statement/ goal symbol defined in the latter section –
>> 
>> | Statement :
>> |   Block
>> |   VariableStatement
>> |   EmptyStatement
>> |   ExpressionStatement
>> |   IfStatement
>> |   IterationStatement
>> |   ContinueStatement
>> |   BreakStatement
>> |   ReturnStatement
>> |   WithStatement
>> |   LabelledStatement
>> |   SwitchStatement
>> |   ThrowStatement
>> |   TryStatement
>> |   DebuggerStatement
> 
> I find it interesting that the symbol is "Block", not "BlockStatement".

The goal symbol right-hand side is irrelevant, as the Specification is 
structured in sections so that it is clear what is a statement and what is 
not.  And the goal symbol left-hand side emphasizes that.

> Things that can only be used as a Statement, such as IfStatement, get
> the word "Statement" in their symbols.

Nonsense.
 
>> specify that what can be produced from the Block goal symbol is
>> considered a
>> statement, or, IOW, that there is a Block statement.  This may be
>> colloquially written "block statement".
> 
> You seem to be confused about my position. I am not saying that no Block
> can be a Statement, just that a Block can be used in situations in which
> a Statement would not be accepted, and so is not always a Statement.

Ex falso quodlibet.  A Block (statement) *cannot* be used in situations in 
which a Statement would not be accepted.  For example, the braces in

  function x (y)
  {
    
  }
 
are _not_ produced by /Block/, they are produced as part of

| FunctionDeclaration :
|   function Identifier ( FormalParameterListopt ) { FunctionBody }

The braces in

  var foo = {
    bar: 42
  };

are _not_ produced by /Block/ either, they are produced as part of

| ObjectLiteral :
|   { }
|   { PropertyNameAndValueList }
|   { PropertyNameAndValueList , }

(formerly, /ObjectInitialiser/, and a trailing comma was a syntax error).


PointedEars
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