43 lines
1.7 KiB
Ruby
43 lines
1.7 KiB
Ruby
module Compiler
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# Compiling is the conversion of the AST into 2 things:
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# - code (ie sequences of Instructions inside Blocks) carried by CompiledMethods
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# - an object graph containing all the Methods, their classes and Constants
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#
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# Some compile methods just add code, some may add structure (ie Blocks) while
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# others instantiate Class and Method objects
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#
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# Everything in ruby is an expression, ie returns a value. So the effect of every compile
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# is that a value is put into the ReturnSlot of the current Message.
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# The compile method (so every compile method) returns the value that it deposits which
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# may be unknown Mystery value.
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#
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# The Compiler.compile uses a visitor patter to dispatch according to the class name of
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# the expression. So a NameExpression is delegated to compile_name etc.
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# This makes the dispatch extensible, ie Expressions may be added by external code,
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# as long as matching compile methods are supplied too.
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#
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def self.compile expression , method
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exp_name = expression.class.name.split("::").last.sub("Expression","").downcase
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#puts "Expression #{exp_name}"
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begin
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self.send "compile_#{exp_name}".to_sym , expression, method
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rescue NoMethodError => e
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puts "No compile method found for " + exp_name
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raise e
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end
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end
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end
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require_relative "compiler/basic_expressions"
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require_relative "compiler/callsite_expression"
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require_relative "compiler/compound_expressions"
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require_relative "compiler/if_expression"
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require_relative "compiler/function_expression"
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require_relative "compiler/module_expression"
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require_relative "compiler/operator_expressions"
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require_relative "compiler/return_expression"
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require_relative "compiler/while_expression"
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require_relative "compiler/expression_list"
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