Created
March 2, 2012 01:37
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Dynamically generating functions with Coffeescript
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| lines = -> Array::join.call arguments, '\n' # joins arguments into a newline separated string | |
| # helper function, generates instructions to put base+index into D | |
| load_from_base = (base) -> (idx) -> lines "@#{base}", "D=M", "@#{idx}", "A=D+A", "D=M" | |
| push_segment = # returns instructions to load value to push into D given index | |
| constant: (idx) -> lines "@#{idx}" 'D=A' | |
| argument: load_from_base 'ARG' | |
| local: load_from_base 'LCL' | |
| this: load_from_base 'THIS' | |
| that: load_from_base 'THAT' | |
| temp: (idx) -> lines '@5', 'D=A', "@#{idx}", 'A=D+A', 'D=M' | |
| pointer: (idx) -> lines '@3', 'D=A', "@#{idx}", 'A=D+A', 'D=M' | |
| static: (idx) -> lines "@#{filename}.#{idx}", 'D=M' |
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| var lines, load_from_base, push_segment; | |
| lines = function(){ | |
| return Array.prototype.join.call(arguments, '\n'); | |
| }; | |
| load_from_base = function(base){ | |
| return function(idx){ | |
| return lines("@" + base, "D=M", "@" + idx, "A=D+A", "D=M"); | |
| }; | |
| }; | |
| push_segment = { | |
| constant: function(idx){ | |
| return lines("@" + idx, 'D=A'); | |
| }, | |
| argument: load_from_base('ARG'), | |
| local: load_from_base('LCL'), | |
| 'this': load_from_base('THIS'), | |
| that: load_from_base('THAT'), | |
| temp: function(idx){ | |
| return lines('@5', 'D=A', "@" + idx, 'A=D+A', 'D=M'); | |
| }, | |
| pointer: function(idx){ | |
| return lines('@3', 'D=A', "@" + idx, 'A=D+A', 'D=M'); | |
| }, | |
| 'static': function(idx){ | |
| return lines("@" + filename + "." + idx, 'D=M'); | |
| } | |
| }; |
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