Class: SwiftAST::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/swift-ast-dump/swift_ast_parser.rb

Instance Method Summary collapse

Instance Method Details

#isalpha(str) ⇒ Object 



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# File 'lib/swift-ast-dump/swift_ast_parser.rb', line 156

def isalpha(str)
  !str.match(/[^A-Za-z@_]/)
end

#isAlphaDigit(str) ⇒ Object 



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# File 'lib/swift-ast-dump/swift_ast_parser.rb', line 159

def isAlphaDigit(str)
  !str.match(/[^A-Za-z@_0-9]/)
end

#isalphaOrDot(str) ⇒ Object 



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# File 'lib/swift-ast-dump/swift_ast_parser.rb', line 162

def isalphaOrDot(str)
  !str.match(/[^A-Za-z@_.,]/)
end

#parse(string) ⇒ Object 



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# File 'lib/swift-ast-dump/swift_ast_parser.rb', line 4

def parse(string)
  @scanner = StringScanner.new(string)
  node = scan_children.first
  node
end

#parse_build_log_output(string) ⇒ Object 



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# File 'lib/swift-ast-dump/swift_ast_parser.rb', line 11

def parse_build_log_output(string)
  @scanner = StringScanner.new(string)
  return unless @scanner.scan_until(/^\(source_file/)

  @scanner.pos = @scanner.pos - 12
  children = scan_children

  return if children.empty?
  Node.new("ast", [], children)
end

#scan_children(level = 0) ⇒ Object 



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# File 'lib/swift-ast-dump/swift_ast_parser.rb', line 42

def scan_children(level = 0)
  children = []
  while true
    return children unless whitespaces = whitespaces_at(level)
    node_name = scan_name?
    return children if node_name == "source_file" && level != 0 && unscan(node_name + whitespaces)
    node_parameters = scan_parameters

    node_children = scan_children(level + 1)

    while next_params = scan_parameters_from_types  # these are stupid params alike
      break if next_params.empty?
      node_parameters += next_params
      node_children += scan_children(level + 1)
    end  
    node = Node.new(node_name, node_parameters, node_children)

    children << node
    @scanner.scan(/(\s|\\|\n|\r|\t)*\)/)
  end  
  children
end

#scan_line_and_column ⇒ Object 



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# File 'lib/swift-ast-dump/swift_ast_parser.rb', line 152

def scan_line_and_column
  @scanner.scan(/:\d+:\d+/)
end

#scan_name? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/swift-ast-dump/swift_ast_parser.rb', line 79

def scan_name? 
  el_name = @scanner.scan(/#?[\w:]+/)
  el_name
end

#scan_parameter?(is_parsing_rvalue = false) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/swift-ast-dump/swift_ast_parser.rb', line 84

def scan_parameter?(is_parsing_rvalue = false)
  #white spaces are skipped

  # scan everything until space or opening sequence like ( < ' ". 
  # Since we can end up with closing bracket - we alos check for )

  prefix = @scanner.scan(/[^\s()'"\[\\]+/) if is_parsing_rvalue
  prefix = @scanner.scan(/[^\s()<'"\[\\=]+/) unless is_parsing_rvalue

  next_char = @scanner.peek(1)
  return nil unless next_char
  should_unwrap_strings = !is_parsing_rvalue && !prefix

  case next_char
  when " "   # next parameter
    result = prefix
  when "\\"   # next parameter
    @scanner.scan(/./)
    result = prefix

  when "\n"   # next parameter
    result = prefix
  when ")"   # closing bracket == end of element
    result = prefix
  when "\""  # doube quoted string 
    result = @scanner.scan(/./) + @scanner.scan_until(/"/)
    result = result[1..-2] if should_unwrap_strings             
    result = (prefix || "") + result
  when "'"  # single quoted string 
    result =  @scanner.scan(/./) + @scanner.scan_until(/'/)
    result = result[1..-2] if should_unwrap_strings             
    result = (prefix || "") + result + (scan_parameter?(is_parsing_rvalue) || "")
  when "<"  # kinda generic
    result = (prefix || "") + @scanner.scan(/./)
    #in some cases this can be last char, just because we can end up with a=sdsd.function.< 
    result += @scanner.scan_until(/>/) + (scan_parameter?(is_parsing_rvalue) || "") 
  when "("
    return nil if !prefix && !is_parsing_rvalue
    result = (prefix || "") + @scanner.scan_until(/\)/) + (scan_parameter?(is_parsing_rvalue) || "")
   when "["
    result = (prefix || "") + scan_range + (scan_parameter?(is_parsing_rvalue) || "")
   when "=" 
    result = prefix + @scanner.scan(/./) + (scan_parameter?(true) || "")

  end  

  # puts "prefix is '#{prefix}'  ||#{is_parsing_rvalue} result =#{result}"

  result

end

#scan_parameters ⇒ Object 



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# File 'lib/swift-ast-dump/swift_ast_parser.rb', line 23

def scan_parameters
  parameters = []

  while true
    @scanner.skip(/\s*/)
    parameter = scan_parameter?
    break unless parameter
    parameters << parameter
  end

  parameters
end

#scan_parameters_from_types ⇒ Object 



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# File 'lib/swift-ast-dump/swift_ast_parser.rb', line 36

def scan_parameters_from_types
  first_param = @scanner.scan(/\d+:/)
  return [] unless first_param
  return [first_param] + scan_parameters
end

#scan_range ⇒ Object 



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# File 'lib/swift-ast-dump/swift_ast_parser.rb', line 136

def scan_range
  return unless @scanner.peek(1) == "["
  result = @scanner.scan(/./)

  while true
    inside = @scanner.scan(/[^\]\[]+/)  #everything but [ or ]
    result += inside || ""
    next_char = @scanner.peek(1)

    return result + @scanner.scan(/./) if next_char == "]" # we found the end
    result += scan_range if next_char == "["
    raise "Unexpected character #{next_char} - [ or ] expected" if next_char != "[" && next_char != "]"
  end

end

#unscan(string) ⇒ Object 



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# File 'lib/swift-ast-dump/swift_ast_parser.rb', line 75

def unscan(string)
  @scanner.pos = @scanner.pos - string.length
end

#whitespaces_at(level = 0) ⇒ Object 



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# File 'lib/swift-ast-dump/swift_ast_parser.rb', line 65

def whitespaces_at(level = 0)
  whitespaces = @scanner.scan(/(\s|\\|\n|\r|\t)*\(/)
  if level == 0 && whitespaces.nil?
     whitespaces = @scanner.scan(/.*?\(source_file/m)
     return nil unless whitespaces
     unscan("source_file")
  end
  whitespaces 
end