Class: MotionBlender::Analyzer::Parser

Inherits:
Object
  • Object
show all
Includes:
ActiveSupport::Callbacks
Defined in:
lib/motion_blender/analyzer/parser.rb

Constant Summary collapse

REQUIREMENT_TOKENS = 
i(motion_require require_relative require)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/motion_blender/analyzer/parser.rb', line 19

def initialize file
  @file = file.to_s
  @requires = []
end

Instance Attribute Details

#exclude_files ⇒ Object

Returns the value of attribute exclude_files.



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# File 'lib/motion_blender/analyzer/parser.rb', line 17

def exclude_files
  @exclude_files
end

#file ⇒ Object (readonly)

Returns the value of attribute file.



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# File 'lib/motion_blender/analyzer/parser.rb', line 16

def file
  @file
end

#last_trace ⇒ Object (readonly)

Returns the value of attribute last_trace.



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# File 'lib/motion_blender/analyzer/parser.rb', line 16

def last_trace
  @last_trace
end

#requires ⇒ Object (readonly)

Returns the value of attribute requires.



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# File 'lib/motion_blender/analyzer/parser.rb', line 16

def requires
  @requires
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/motion_blender/analyzer/parser.rb', line 24

def parse
  ast = ::Parser::CurrentRuby.parse(File.read(@file))
  traverse ast if ast
end

#raketime_block?(ast) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/motion_blender/analyzer/parser.rb', line 51

def raketime_block? ast
  (ast.type == :block) &&
    (ast.children.first.loc.expression.source == 'MotionBlender.raketime')
end

#require_command?(ast) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/motion_blender/analyzer/parser.rb', line 47

def require_command? ast
  (ast.type == :send) && REQUIREMENT_TOKENS.include?(ast.children[1])
end

#trace_for(ast) ⇒ Object 



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# File 'lib/motion_blender/analyzer/parser.rb', line 56

def trace_for ast
  "#{@file}:#{ast.loc.line}:in `#{ast.children[1]}'"
end

#traverse(ast, stack = []) ⇒ Object 



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# File 'lib/motion_blender/analyzer/parser.rb', line 29

def traverse ast, stack = []
  @exclude_files ||= Set.new
  if require_command?(ast)
    @last_trace = trace_for ast
    Evaluator.new(@file, ast, stack).parse_args.each do |arg|
      req = Require.new(@file, ast.children[1], arg)
      next if @exclude_files.include? req.arg
      next if @exclude_files.include? req.file
      req.trace = @last_trace
      @requires << req
    end
  elsif !raketime_block?(ast)
    ast.children
      .select { |node| node.is_a?(::Parser::AST::Node) }
      .each { |node| traverse node, [*stack, ast] }
  end
end