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Javascript example: Improve array literal rules

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Makes the |ArrayLiteral| and |ElementList| rules more in line with the
ECMAScript grammar.

Based on a patch by @fpirsch:

  https://github.com/dmajda/pegjs/pull/177
This commit is contained in:
David Majda 2013-08-31 10:28:48 +02:00
parent b6ccad6695
commit d71bca46a1
1 changed files with 10 additions and 4 deletions
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14
examples/javascript.pegjs
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@ -475,20 +475,26 @@ PrimaryExpression
/ "(" __ expression:Expression __ ")" { return expression; } / "(" __ expression:Expression __ ")" { return expression; }
ArrayLiteral ArrayLiteral
= "[" __ elements:ElementList? __ (Elision __)? "]" { = "[" __ (Elision __)? "]" {
return { return {
type: "ArrayLiteral", type: "ArrayLiteral",
elements: elements !== "" ? elements : [] elements: []
};
}
/ "[" __ elements:ElementList __ ("," __ (Elision __)?)? "]" {
return {
type: "ArrayLiteral",
elements: elements
}; };
} }
ElementList ElementList
= (Elision __)? = (Elision __)?
head:AssignmentExpression head:AssignmentExpression
tail:(__ "," __ Elision? __ AssignmentExpression)* { tail:(__ "," __ (Elision __)? AssignmentExpression)* {
var result = [head]; var result = [head];
for (var i = 0; i < tail.length; i++) { for (var i = 0; i < tail.length; i++) {
result.push(tail[i][5]); result.push(tail[i][4]);
} }
return result; return result;
} }