Class: Coffeetags::Parser

Inherits:
Object show all
Defined in:
lib/CoffeeTags/parser.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(source, include_vars = false) ⇒ Coffeetags::Parser

Creates a new parser

Parameters:

  • source (String) —

    source of the CoffeeScript file

  • include_vars (Bool) (defaults to: false) —

    include objects in generated tree (default false)



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# File 'lib/CoffeeTags/parser.rb', line 9

def initialize source, include_vars = false
  @include_vars = include_vars
  @source = source

  @fake_parent = 'window'

  # tree maps the ... tree :-)
  @tree = []

  # regexes
  @block = /^\s*(if|unless|switch|loop|do)/
  @class_regex = /\s*class\s*(?:@)?([\w\.]*)/
  @proto_meths = /^\s*([A-Za-z]*)::([@a-zA-Z0-9_]*)/
  @var_regex = /([@a-zA-Z0-9_]*)\s*[=:]{1}\s*$/
  @token_regex = /([@a-zA-Z0-9_]*)\s*[:=]{1}/
  @iterator_regex = /^\s*for\s*([a-zA-Z0-9_]*)\s*/
  @comment_regex = /^\s*#/
  @start_block_comment_regex = /^\s*###/
  @end_block_comment_regex = /^.*###/
  @oneline_block_comment_regex = /^\s*###.*###/
  @comment_lines = mark_commented_lines
end

Instance Attribute Details

#tree ⇒ Object (readonly)

Returns the value of attribute tree.



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# File 'lib/CoffeeTags/parser.rb', line 3

def tree
  @tree
end

Instance Method Details

#execute! ⇒ Object

Note:

this method mutates @tree instance variable of Coffeetags::Parser instance

Parse the source and create a tags tree



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# File 'lib/CoffeeTags/parser.rb', line 113

def execute!
  line_n = 0
  level = 0
  @source.each_line do |line|
    line_n += 1
    # indentify scopes
    level = line_level line

    # ignore comments!
    next if @comment_lines.include? line_n

    # extract elements for given line
    [
      @class_regex,
      @proto_meths,
      @var_regex
    ].each do |regex|
      mt = item_for_regex line, regex, level
      @tree << mt unless mt.nil?
    end


    # does this line contain a block?
    mt = item_for_regex line, @block, level, :kind => 'b'
    @tree << mt unless mt.nil?


    # instance variable or iterator (for/in)?
    token = line.match(@token_regex )
    token ||=  line.match(@iterator_regex)

    # we have found something!
    if not token.nil?
      o = {
        :name => token[1],
        :level => level,
        :parent => '',
        :source => line.chomp,
        :line => line_n
      }

      # remove edge cases for now
      # - if a line containes a line like:  element.getElement('type=[checkbox]').lol()
      is_in_string = line =~ /.*['"].*#{token[1]}.*=.*["'].*/

      # - scope access and comparison in if x == 'lol'
      is_in_comparison = line =~ /::|==/

      # - objects with blank parent (parser bug?)
      has_blank_parent = o[:parent] =~ /\.$/

      # - multiple consecutive assignments
      is_previous_not_the_same = !(@tree.last and @tree.last[:name] == o[:name] and  @tree.last[:level] == o[:level])

      if is_in_string.nil? and is_in_comparison.nil? and has_blank_parent.nil? and is_previous_not_the_same
        o[:kind]   =  line =~ /[:=]{1}.*[-=]\>/ ? 'f' : 'o'
        o[:parent] =  scope_path o
        o[:parent] = @fake_parent if o[:parent].empty?

        @tree << o if o[:kind] == 'f'
        @tree << o if o[:kind] == 'o' and @include_vars
      end
    end
    # get rid of duplicate entries
    @tree.uniq!
  end
  self # chain!
end

#item_for_regex(line, regex, level, additional_fields = {}) ⇒ Object

Helper function for generating parse tree elements for given line and regular expression

Parameters:

  • line (String) —

    source line currently being parsed

  • regex (RegExp) —

    regular expression for matching a syntax element

  • level (Integer) —

    current indentation/line level

  • additional_fields (Hash, {}) (defaults to: {}) —

    additional fields which need to be added to generated element



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# File 'lib/CoffeeTags/parser.rb', line 100

def item_for_regex line,  regex, level, additional_fields={}
  if item = line.match(regex)
    entry_for_item = {
      :name => item[1],
      :level => level
    }
    entry_for_item.merge(additional_fields)
  end
end

#line_level(line) ⇒ Integer

Detect current line level based on indentation very useful in parsing, since CoffeeScript’s syntax depends on whitespace

Parameters:

  • line (String) —

    currently parsed line

Returns:

  • (Integer) 


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# File 'lib/CoffeeTags/parser.rb', line 60

def line_level line
  line.match(/^[ \t]*/)[0].gsub("\t", " ").split('').length
end

#mark_commented_lines ⇒ Object

Mark line numbers as commented out either by single line comment (#) or block comments (###~###)



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# File 'lib/CoffeeTags/parser.rb', line 35

def mark_commented_lines
  [].tap do |reg|
    in_block_comment = false
    line_no = 0
    start_block = 0
    end_block = 0
    @source.each_line do |line|
      line_no = line_no+1

      start_block = line_no if !in_block_comment and line =~ @start_block_comment_regex
      end_block = line_no if start_block < line_no and line =~ @end_block_comment_regex
      end_block = line_no if line =~ @oneline_block_comment_regex

      in_block_comment = end_block < start_block

      reg << line_no if in_block_comment or end_block == line_no or line =~ @comment_regex
    end
  end
end

#scope_path(_el = nil, _tree = nil) ⇒ Object

Generate current scope path, for example:

e  ->
  f ->
    z ->

Scope path for function z would be: window.e.f

Parameters:

  • _el (Hash, nil) (defaults to: nil) —

    element of a prase tree (last one for given tree is used by default)

  • _tree (Array, nil) (defaults to: nil) —

    parse tree (or currently built)



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# File 'lib/CoffeeTags/parser.rb', line 73

def scope_path _el = nil, _tree = nil
  bf = []
  tree = (_tree || @tree)
  element = (_el || tree.last)
  idx = tree.index(element) || -1

  current_level = element[:level]
  tree[0..idx].reverse.each_with_index do |item, index|
    # uhmmmmmm
    if item[:level] != current_level and item[:level] < current_level and item[:line] !~  @block
      bf << item[:name] unless item[:kind] == 'b'
      current_level = item[:level]
    end
  end
  bf.uniq.reverse.join('.')
end