Class: Antlr4::Runtime::Utils

Inherits:
Object
  • Object
show all
Defined in:
lib/antlr4/runtime/utils.rb

Class Method Summary collapse

Class Method Details

.count(s, x) ⇒ Object 



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# File 'lib/antlr4/runtime/utils.rb', line 107

def self.count(s, x)
  n = 0
  i = 0
  while i < s.length
    n += 1 if s[i] == x
    i += 1
  end
  n
end

.escape_whitespace(s, escape_spaces) ⇒ Object 



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# File 'lib/antlr4/runtime/utils.rb', line 22

def self.escape_whitespace(s, escape_spaces)
  buf = ''
  s.each_char do |c|
    buf << if c == ' ' && escape_spaces
             '\u00B7'
           elsif c == '\t'
             '\\t'
           elsif c == '\n'
             '\\n'
           elsif c == '\r'
             '\\r'
           else
             c
           end
  end
  buf
end

.expand_tabs(s, tab_size) ⇒ Object 



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# File 'lib/antlr4/runtime/utils.rb', line 64

def self.expand_tabs(s, tab_size)
  return nil if s.nil?

  buf = ''
  col = 0
  i = 0
  while i < s.length
    c = s[i]
    case c
    when '\n'
      col = 0
      buf << c
    when '\t'
      n = tab_size - col % tab_size
      col += n
      buf << spaces(n)
    else
      col += 1
      buf << c
    end
    i += 1
  end
  buf
end

.newlines(n) ⇒ Object 



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# File 'lib/antlr4/runtime/utils.rb', line 93

def self.newlines(n)
  sequence(n, "\n")
end

.num_non_nil(data) ⇒ Object 



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# File 'lib/antlr4/runtime/utils.rb', line 3

def self.num_non_nil(data)
  n = 0
  return n if data.nil?

  i = 0
  while i < data.length
    o = datap[i]
    n += 1 unless o.nil?
    i += 1
  end
  n
end

.read_file(file_name, _encoding = nil) ⇒ Object 



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# File 'lib/antlr4/runtime/utils.rb', line 50

def self.read_file(file_name, _encoding = nil)
  f = File.new(file_name, 'r')
  size = File.size(file_name)

  begin
    data = Array.new(size)
    f.read(nil, data)
  ensure
    f.close
  end

  data
end

.remove_all_elements(data, value) ⇒ Object 



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# File 'lib/antlr4/runtime/utils.rb', line 16

def self.remove_all_elements(data, value)
  return if data.nil?

  data.remove(value) while data.contains(value)
end

.sequence(n, s) ⇒ Object 



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# File 'lib/antlr4/runtime/utils.rb', line 97

def self.sequence(n, s)
  buf = ''
  sp = 1
  while sp <= n
    buf << s
    sp += 1
  end
  buf
end

.spaces(n) ⇒ Object 



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# File 'lib/antlr4/runtime/utils.rb', line 89

def self.spaces(n)
  sequence(n, ' ')
end

.write_file(file_name, content, _encoding = nil) ⇒ Object 



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# File 'lib/antlr4/runtime/utils.rb', line 40

def self.write_file(file_name, content, _encoding = nil)
  f = File.new(file_name, 'w')

  begin
    f << content
  ensure
    f.close
  end
end