f4a4ccb98e
- all code must be in functions (which must be in classes). — changes a fair few tests — also changes api, as method is not recursive, not passed around - all state in instance vars in compiler (no accessors) - class is another such variable, surely more coming all green again
48 lines
1.8 KiB
Ruby
48 lines
1.8 KiB
Ruby
module Bosl
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class Compiler < AST::Processor
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def initialize()
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end
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def handler_missing node
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raise "No handler on_#{node.type}(node)"
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end
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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 MethodSource
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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.
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#
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# The process uses a visitor pattern (from AST::Processor) to dispatch according to the
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# type the expression. So a s(:if xx) will become an on_if(node) call.
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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
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compiler = Compiler.new
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compiler.process expression
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end
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end
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end
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require_relative "ast_helper"
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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/class_field"
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require_relative "compiler/compound_expressions"
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require_relative "compiler/expression_list"
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require_relative "compiler/field_def"
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require_relative "compiler/field_access"
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require_relative "compiler/function_expression"
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require_relative "compiler/if_expression"
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require_relative "compiler/module_expression"
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require_relative "compiler/name_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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