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self-compiling ranges and expressions

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Jeremy Ashkenas
2010-02-11 20:20:59 -05:00
parent 38d1381c02
commit 950d1199c2
2 changed files with 9 additions and 5 deletions
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6
src/nodes.coffee
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@@ -195,7 +195,7 @@ statement Expressions
LiteralNode: exports.LiteralNode: inherit Node, {
constructor: (value) ->
@children: [@value: value]
@value: value
this
# Break and continue must be treated as statements -- they lose their meaning
@@ -442,6 +442,8 @@ RangeNode: exports.RangeNode: inherit Node, {
return @compile_array(o) unless o.index
idx: del o, 'index'
step: del o, 'step'
vars: idx + '=' + @from_var
step: if step then step.compile(o) else '1'
equals: if @exclusive then '' else '='
intro: '(' + @from_var + ' <= ' + @to_var + ' ? ' + idx
compare: intro + ' <' + equals + ' ' + @to_var + ' : ' + idx + ' >' + equals + ' ' + @to_var + ')'
@@ -453,7 +455,7 @@ RangeNode: exports.RangeNode: inherit Node, {
# TODO: This generates pretty ugly code ... shrink it.
compile_array: (o) ->
body: Expressions.wrap([new LiteralNode('i')])
arr: Expressions.wrap([new ForNode(body, {source: (new ValueNode(this))}, 'i')])
arr: Expressions.wrap([new ForNode(body, {source: (new ValueNode(this))}, new LiteralNode('i'))])
(new ParentheticalNode(new CallNode(new CodeNode([], arr)))).compile(o)
}