75 lines
1.7 KiB
Ruby
75 lines
1.7 KiB
Ruby
require 'bitescript'
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require 'vm/parser'
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require 'vm/transform'
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require 'vm/builtins'
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module Vm
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class Compiler
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def initialize(filename)
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@filename = filename
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@classname = File.basename(@filename, '.vm')
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end
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def compile
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tree = parse_source
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funcs, exprs = split_functions tree
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classname = @classname
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builder = BiteScript::FileBuilder.build(@filename) do
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public_class classname, object do |klass|
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klass.extend(Builtins)
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klass.add_builtins
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funcs.each do |f|
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context = Hash.new
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f.eval(context, klass)
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end
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klass.public_static_method 'main', [], void, string[] do |method|
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context = Hash.new
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exprs.each do |e|
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e.eval(context, method)
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end
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method.returnvoid
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end
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end
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end
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write_result builder
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end
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private
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def parse_source
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source = File.expand_path(@filename)
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program = IO.read source
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parser = Parser.new
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transform = Transform.new
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syntax = parser.parse(program)
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tree = transform.apply(syntax)
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Array(tree)
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end
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def split_functions(tree)
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first_expr = tree.index { |t| ! t.is_a?(FunctionExpression) }
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funcs = first_expr ? tree[0...first_expr] : tree
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exprs = first_expr ? tree[first_expr..-1] : []
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[funcs, exprs]
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end
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def write_result(builder)
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destination = File.expand_path(@classname + '.class')
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builder.generate do |n, b|
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File.open(destination, 'wb') do |f|
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f.write b.generate
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end
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end
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end
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end
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end
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