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improved range compilation

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This commit is contained in:
Michael Ficarra
2011-03-23 13:49:15 -04:00
parent 61918a1efa
commit c4b72fcc79
3 changed files with 14 additions and 16 deletions
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15
src/nodes.coffee
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@@ -642,10 +642,9 @@ exports.Range = class Range extends Base
idx = del o, 'index'
step = del o, 'step'
vars = "#{idx} = #{@from}" + if @to isnt @toVar then ", #{@to}" else ''
intro = "(#{@fromVar} <= #{@toVar} ? #{idx}"
compare = "#{intro} <#{@equals} #{@toVar} : #{idx} >#{@equals} #{@toVar})"
stepPart = if step then step.compile(o) else '1'
incr = if step then "#{idx} += #{stepPart}" else "#{intro} += #{stepPart} : #{idx} -= #{stepPart})"
cond = "#{@fromVar} <= #{@toVar}"
compare = "#{cond} ? #{idx} <#{@equals} #{@toVar} : #{idx} >#{@equals} #{@toVar}"
incr = if step then "#{idx} += #{step.compile(o)}" else "#{cond} ? #{idx}++ : #{idx}--"
"#{vars}; #{compare}; #{incr}"
# Compile a simple range comprehension, with integers.
@@ -671,11 +670,11 @@ exports.Range = class Range extends Base
pre = "\n#{idt}#{result} = [];"
if @fromNum and @toNum
o.index = i
body = @compileSimple o
body = @compileSimple o
else
vars = "#{i} = #{@from}" + if @to isnt @toVar then ", #{@to}" else ''
clause = "#{@fromVar} <= #{@toVar} ?"
body = "var #{vars}; #{clause} #{i} <#{@equals} #{@toVar} : #{i} >#{@equals} #{@toVar}; #{clause} #{i} += 1 : #{i} -= 1"
vars = "#{i} = #{@from}" + if @to isnt @toVar then ", #{@to}" else ''
cond = "#{@fromVar} <= #{@toVar}"
body = "var #{vars}; #{cond} ? #{i} <#{@equals} #{@toVar} : #{i} >#{@equals} #{@toVar}; #{cond} ? #{i}++ : #{i}--"
post = "{ #{result}.push(#{i}); }\n#{idt}return #{result};\n#{o.indent}"
"(function() {#{pre}\n#{idt}for (#{body})#{post}}).apply(this, arguments)"