127 lines
5.7 KiB
Ruby
127 lines
5.7 KiB
Ruby
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#include is private in 1.9, who'd have known without travis
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Parslet::Context.send :include , AST::Sexp
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Parslet::Context.class_eval do
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def type_sym t
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if( t.is_a? AST::Node )
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t = t.children.first
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else
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t = t.to_sym
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t = :Integer if t == :int
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end
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t
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end
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end
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module Parser
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class Transform < Parslet::Transform
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rule(:string => sequence(:chars)) { s(:string , chars.join) }
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rule(:esc => simple(:esc)) { '\\' + esc }
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rule(char: simple(:char)) { char }
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rule(:true => simple(:true)) { s(:true) }
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rule(:false => simple(:false)) { s(:false) }
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rule(:nil => simple(:nil)) { s(:nil) }
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rule(:integer => simple(:value)) { s(:int ,value.to_i) }
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rule(:name => simple(:name)) { s(:name , name.to_sym) }
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# local variables
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rule(:type => simple(:type), :name => simple(:name)) { s(:field_def , type_sym(type) , name.to_sym) }
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rule(:type => simple(:type), :name => simple(:name) , :value => simple(:value)) {
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s(:field_def , type_sym(type) , name.to_sym , value ) }
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# class field
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rule(:field => simple(:field) , :type => simple(:type), :name => simple(:name)) {
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s(:class_field , type_sym(type) , name.to_sym) }
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rule(:field => simple(:field) , :type => simple(:type), :name => simple(:name) , :value => simple(:value)) {
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s(:class_field , type_sym(type) , name.to_sym , value ) }
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rule(:l_value => simple(:l_value) , :assign => simple(:assign) , :r_value => simple(:r_value)) {
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s(:assignment , l_value , r_value)
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}
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rule( :left => simple(:left) , :operator => simple(:operator) ,
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:right => simple(:right)) { s(:operator_value , operator.to_sym , left , right )}
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rule(:class_name => simple(:class_name)) { s(:class_name,class_name.to_s.to_sym) }
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rule(:array_constant => sequence(:array_constant) ) { s(:array , *array_constant) }
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rule(:array_element => simple(:array_element)) { array_element }
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rule(:hash_constant => sequence(:hash_constant) ) { s(:hash , *hash_constant) }
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rule(:hash_key => simple(:hash_key) , :hash_value => simple(:hash_value)) { s(:assoc , hash_key , hash_value) }
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rule(:hash_pair => simple(:hash_pair) ) { hash_pair }
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rule(:argument => simple(:argument)) { argument }
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rule(:argument_list => sequence(:argument_list)) { argument_list }
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#Two rules for calls, simple and qualified. Keeps the rules simpler
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rule( :call_site => simple(:call_site),
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:argument_list => sequence(:argument_list)) do
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s(:call , call_site, s(:arguments , *argument_list) )
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end
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rule( :receiver => simple(:receiver) , :call_site => simple(:call_site),
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:argument_list => sequence(:argument_list)) do
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s(:call , call_site, s(:arguments , *argument_list) , s(:receiver , receiver))
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end
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rule( :receiver => simple(:receiver) , :field => simple(:field) ) do
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s(:field_access , s(:receiver , receiver) , s(:field , field) )
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end
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rule(:while => simple(:while),
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:condition => simple(:condition) ,
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:body => {:statements => sequence(:body) , :end => simple(:e) }) do
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s(:while_statement , s(:condition , condition), s(:statements , *body))
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end
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rule(:if_statement => simple(:if_statement), :conditional => simple(:conditional),
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:true_statements => {:statements => sequence(:true_statements) , :else => simple(:else) },
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:false_statements => {:statements => sequence(:false_statements) , :end => simple(:e) }) do
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s(:if_statement , s(:condition, conditional), s(:true_statements, *true_statements),
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s(:false_statements , *false_statements))
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end
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rule(:if_statement => simple(:if_statement), :conditional => simple(:conditional),
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:true_statements => {:statements => sequence(:true_statements) , :end => simple(:e) }) do
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s(:if_statement , s(:condition, conditional), s(:true_statements, *true_statements), s(:false_statements , nil) )
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end
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rule(:return => simple(:return) , :return_statement => simple(:return_statement))do
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s(:return , return_statement)
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end
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rule(:parameter => simple(:parameter)) { s(:parameter , *parameter) }
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# Also two rules for function definitions, unqualified and qualified
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rule(:type => simple(:type) ,
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:function_name => simple(:function_name),
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:parameter_list => sequence(:parameter_list),
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:statements => sequence(:statements) , :end => simple(:e)) do
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s(:function, type_sym(type) , function_name, s(:parameters , *parameter_list ),
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s(:statements , *statements))
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end
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rule(:type => simple(:type) ,
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:receiver=> simple(:receiver),
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:function_name => simple(:function_name),
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:parameter_list => sequence(:parameter_list),
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:statements => sequence(:statements) , :end => simple(:e)) do
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s(:function, type_sym(type) , function_name, s(:parameters , *parameter_list ),
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s(:statements , *statements) , s(:receiver , *receiver))
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end
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rule( :class_name => simple(:class_name) , :derived_name => simple(:derived_name) , :class_statements => sequence(:class_statements) , :end=>"end") do
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s(:class , class_name.to_s.to_sym ,
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s(:derives, derived_name ? derived_name.to_a.first.to_sym : nil) ,
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s(:statements, *class_statements) )
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end
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rule(:statement_list => sequence(:statement_list)) {
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s(:statements , *statement_list)
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}
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#shortcut to get the ast tree for a given string
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# optional second arguement specifies a rule that will be parsed (mainly for testing)
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def self.ast string , rule = :root
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syntax = Parser.new.send(rule).parse(string)
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tree = Transform.new.apply(syntax)
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tree
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end
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end
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end
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