Class: HCL::Checker::Lexer

Inherits:
Object
  • Object
show all
Defined in:
lib/hcl/checker/lexer.rb

Overview

-- DO NOT MODIFY!!!! This file is automatically generated by rex 1.0.8 from lexical definition file "./assets/lexer.rex". ++

Defined Under Namespace

Classes: ScanError

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#filename ⇒ Object (readonly)

Returns the value of attribute filename.



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# File 'lib/hcl/checker/lexer.rb', line 13

def filename
  @filename
end

#lineno ⇒ Object (readonly)

Returns the value of attribute lineno.



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# File 'lib/hcl/checker/lexer.rb', line 12

def lineno
  @lineno
end

#state ⇒ Object

Returns the value of attribute state.



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# File 'lib/hcl/checker/lexer.rb', line 14

def state
  @state
end

#token_positions ⇒ Object (readonly)

def _next_token



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# File 'lib/hcl/checker/lexer.rb', line 191

def token_positions
  @token_positions
end

Instance Method Details

#_next_token ⇒ Object 



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# File 'lib/hcl/checker/lexer.rb', line 53

def _next_token
  text = @ss.peek(1)
  @lineno  +=  1  if text == "\n"
  token = case @state
    when nil
  case
          when (text = @ss.scan(/\s+/))
            ;

          when (text = @ss.scan(/\#.*|\/\/.*$/))
            ;

          when (text = @ss.scan(/\n|\r/))
            ;

          when (text = @ss.scan(/\/\*/))
             action { consume_comment(text) }

          when (text = @ss.scan(/true|false/))
             action { [:BOOL,         to_boolean(text)]}

          when (text = @ss.scan(/null(?![a-zA-Z0-9_\-])/))
             action { [:NULL,         text]}

          when (text = @ss.scan(/for(?![a-zA-Z0-9_\-])/))
             action { [:FOR,          text]}

          when (text = @ss.scan(/in(?![a-zA-Z0-9_\-])/))
             action { [:IN,           text]}

          when (text = @ss.scan(/if(?![a-zA-Z0-9_\-])/))
             action { [:IF,           text]}

          when (text = @ss.scan(/\d+(\.\d+)?[eE][-+]?\d+|\d+\.\d+/))
             action { [:FLOAT,        text.to_f] }

          when (text = @ss.scan(/\d+/))
             action { [:NUMBER,       text.to_i] }

          when (text = @ss.scan(/\"/))
             action { [:STRING,       consume_string(text)] }

          when (text = @ss.scan(/\<<\-?/))
             action { [:STRING,       consume_heredoc(text.end_with?('-'))] }

          when (text = @ss.scan(/\{/))
             action { [:LEFTBRACE,        text]}

          when (text = @ss.scan(/\}/))
             action { [:RIGHTBRACE,       text]}

          when (text = @ss.scan(/\[/))
             action { [:LEFTBRACKET,      text]}

          when (text = @ss.scan(/\]/))
             action { [:RIGHTBRACKET,     text]}

          when (text = @ss.scan(/\(/))
             action { [:LEFTPARENTHESES,  text]}

          when (text = @ss.scan(/\)/))
             action { [:RIGHTPARENTHESES, text]}

          when (text = @ss.scan(/\,/))
             action { [:COMMA,        text]}

          when (text = @ss.scan(/[a-zA-Z_][a-zA-Z0-9_\-]*/))
             action { [:IDENTIFIER,   text]}

          when (text = @ss.scan(/\=\=/))
             action { [:EQEQ,         text]}

          when (text = @ss.scan(/\!\=/))
             action { [:NEQ,          text]}

          when (text = @ss.scan(/\<\=/))
             action { [:LE,           text]}

          when (text = @ss.scan(/\>\=/))
             action { [:GE,           text]}

          when (text = @ss.scan(/\=\>/))
             action { [:ARROW,        text]}

          when (text = @ss.scan(/\</))
             action { [:LT,           text]}

          when (text = @ss.scan(/\>/))
             action { [:GT,           text]}

          when (text = @ss.scan(/\=/))
             action { [:EQUAL,        text]}

          when (text = @ss.scan(/\-/))
             action { [:MINUS,        text]}

          when (text = @ss.scan(/\+/))
             action { [:PLUS,         text]}

          when (text = @ss.scan(/\*/))
             action { [:STAR,         text]}

          when (text = @ss.scan(/\//))
             action { [:SLASH,        text]}

          when (text = @ss.scan(/\%/))
             action { [:PERCENT,      text]}

          when (text = @ss.scan(/\&\&/))
             action { [:ANDAND,       text]}

          when (text = @ss.scan(/\|\|/))
             action { [:OROR,         text]}

          when (text = @ss.scan(/\?/))
             action { [:QUESTION,     text]}

          when (text = @ss.scan(/\:/))
             action { [:COLON,        text]}

          when (text = @ss.scan(/\./))
             action { [:PERIOD,       text]}

          when (text = @ss.scan(/\!/))
             action { [:BANG,         text]}

  
  else
    text = @ss.string[@ss.pos .. -1]
    raise  ScanError, "can not match: '" + text + "'"
  end  # if

else
  raise  ScanError, "undefined state: '" + state.to_s + "'"
end  # case state
  token
end

#action ⇒ Object 



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# File 'lib/hcl/checker/lexer.rb', line 22

def action
  yield
end

#consume_comment(input) ⇒ Object 



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# File 'lib/hcl/checker/lexer.rb', line 211

def consume_comment(input)
  nested = 1
  until nested.zero?
    case(text = @ss.scan_until(%r{/\*|\*/|\z}) )
    when %r{/\*\z}
      nested += 1
    when %r{\*/\z}
      nested -= 1
    else
      raise ScanError, 'unterminated block comment'
    end
  end
end

#consume_heredoc(indented) ⇒ Object

Raises:



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# File 'lib/hcl/checker/lexer.rb', line 264

def consume_heredoc(indented)
  marker_line = @ss.scan_until(%r{\n})
  raise ScanError, 'unterminated heredoc: missing marker' if marker_line.nil?
  marker = marker_line.strip
  closing = /^[ \t]*#{Regexp.escape(marker)}[ \t]*(?:\n|\z)/
  raw = @ss.scan_until(closing)
  raise ScanError, "unterminated heredoc: missing closing marker '#{marker}'" if raw.nil?
  content = raw.sub(closing, '')
  indented ? dedent(content) : content
end

#consume_string(input) ⇒ Object 



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# File 'lib/hcl/checker/lexer.rb', line 224

def consume_string(input)
  result = ''
  nested = 0
  loop do
    text = @ss.scan_until(%r{\"|\$\{|%\{|\}|\\})
    raise ScanError, 'unterminated string' if text.nil?
    case text
    when %r{\$\{\z}
      nested += 1
    when %r{%\{\z}
      nested += 1
    when %r{\}\z}
      nested -= 1 if nested.positive?
    when %r{\\\z}
      result += text.chop + decode_escape
      next
    end
    result += text.to_s
    break if nested.zero? && text =~ %r{\"\z}
  end
  result.chop
end

#current_position ⇒ Object 



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# File 'lib/hcl/checker/lexer.rb', line 202

def current_position
  consumed = @ss.string[0...@ss.pos]
  line = consumed.count("\n") + 1
  column = consumed.length - (consumed.rindex("\n") || -1)
  [line, column]
end

#decode_escape ⇒ Object 



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# File 'lib/hcl/checker/lexer.rb', line 246

def decode_escape
  char = @ss.getch
  case char
  when 'n' then "\n"
  when 't' then "\t"
  when 'r' then "\r"
  when '"' then '"'
  when '\\' then '\\'
  when 'u'
    hex = @ss.scan(/[0-9a-fA-F]{4}/)
    hex ? [hex.to_i(16)].pack('U') : 'u'
  when 'U'
    hex = @ss.scan(/[0-9a-fA-F]{8}/)
    hex ? [hex.to_i(16)].pack('U') : 'U'
  else
    char.to_s
  end
end

#dedent(text) ⇒ Object 



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# File 'lib/hcl/checker/lexer.rb', line 274

def dedent(text)
  lines = text.split("\n", -1)
  indents = lines.reject { |line| line.strip.empty? }.map { |line| line[/\A[ \t]*/].length }
  indent = indents.min || 0
  lines.map { |line| line.strip.empty? ? line : line[indent..] }.join("\n")
end

#lex(input) ⇒ Object 



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# File 'lib/hcl/checker/lexer.rb', line 192

def lex(input)
  scan_setup(input)
  tokens = []
  @token_positions = []
  while token = next_token
    tokens << token
    @token_positions << current_position
  end
  tokens
end

#load_file(filename) ⇒ Object 



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# File 'lib/hcl/checker/lexer.rb', line 32

def load_file( filename )
  @filename = filename
  File.open(filename, "r") do |f|
    scan_setup(f.read)
  end
end

#next_token ⇒ Object 



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# File 'lib/hcl/checker/lexer.rb', line 45

def next_token
  return if @ss.eos?

  # skips empty actions
  until token = _next_token or @ss.eos?; end
  token
end

#scan_file(filename) ⇒ Object 



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# File 'lib/hcl/checker/lexer.rb', line 39

def scan_file( filename )
  load_file(filename)
  do_parse
end

#scan_setup(str) ⇒ Object 



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# File 'lib/hcl/checker/lexer.rb', line 16

def scan_setup(str)
  @ss = StringScanner.new(str)
  @lineno =  1
  @state  = nil
end

#scan_str(str) ⇒ Object Also known as: scan 



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# File 'lib/hcl/checker/lexer.rb', line 26

def scan_str(str)
  scan_setup(str)
  do_parse
end

#to_boolean(input) ⇒ Object 



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# File 'lib/hcl/checker/lexer.rb', line 208

def to_boolean(input)
  input == 'true'
end