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Allowing pattern matching within for..loops

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Stan Angeloff
2010-04-26 21:35:35 +03:00
parent 2d1abd099d
commit 2a3a713811
6 changed files with 152 additions and 88 deletions
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12
src/grammar.coffee
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@@ -433,12 +433,20 @@ grammar: {
o "FOR ForVariables ForSource Block", -> new ForNode $4, $3, $2[0], $2[1]
]
# An array of all accepted values for a variable inside the loop. This
# enables support for pattern matching.
ForValue: [
o "Identifier"
o "Array", -> new ValueNode $1
o "Object", -> new ValueNode $1
]
# An array or range comprehension has variables for the current element and
# (optional) reference to the current index. Or, *key, value*, in the case
# of object comprehensions.
ForVariables: [
o "Identifier", -> [$1]
o "Identifier , Identifier", -> [$1, $3]
o "ForValue", -> [$1]
o "ForValue , ForValue", -> [$1, $3]
]
# The source of a comprehension is an array or object with an optional filter