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plurals

PO
primarykey
Id
19782924
data
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0
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0
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2
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CreationDate
2013-11-05T06:12:01.783
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0
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2013-11-05T06:12:01.783
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0
OwnerUserId
1684079
ParentId
19781894
PostTypeId
2
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0
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0
LastEditorDisplayName
text
Body
The line in question is the first part of an alternative expression, for the <code>primary</code> rule -- it is tested only if <code>integer</code> does not match. This alternate expression starts after the <code>/</code> and includes the corresponding action block: <code>{ return comma; }</code> Note that "comma" is being used in two distinct ways here -- both as a rule name and also as a label identifier. See <a href="http://pegjs.majda.cz/documentation#grammar-syntax-and-semantics-parsing-expression-types" rel="nofollow">PEG.js - Parsing Expression Types</a>: <blockquote> label : expression Match the expression and remember its match result under given label. The label must be a JavaScript identifier. ... </blockquote> So, <code>integer / "(" comma:comma ")"</code> first attempts to match <code>integer</code>; if that fails it then attempts to match the entire second expression. The label could be any valid JavaScript identifier. Please consider the following snippet, which is functionally-equivalent to your example: <pre><code>primary = integer / "(" result:comma ")" { return result; } </code></pre> If parenthesis are not relevant then you could omit the entire second expression, leaving just: <pre><code>primary = integer </code></pre> As another quick example of labeling, this would also work (but is redundant): <pre><code>primary = anumber:integer { return anumber; } </code></pre>
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1. POCan explain what is necesariy the extra rule on this PEG
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1. UShumbletim
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1. COif you remove the ` / "(" comma:comma ")"` line the sample dont work
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2. COcorrect; think of the two lines after the ```/``` like ```function(comma) { return comma; }```. you are only removing the ```function(comma)``` part -- and apparently leaving behind the trailing, related ```{ return comma; }``` part? if you remove the line in question, you must also remove the related action...
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