Class: CTioga2::Commands::Parsers::FileParser

Inherits:
Object
  • Object
show all
Includes:
Log
Defined in:
lib/ctioga2/commands/parsers/file.rb

Overview

This class parses a “new style” command file, delegating to the old parser if this looks like an old style command file.

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Log

context, counts, debug, error, fatal, #format_exception, #identify, info, init_logger, log_to, logger, set_level, #spawn, warn

Class Method Details

.run_command_file(file, interpreter) ⇒ Object

Runs a command file targeting the given interpreter.



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# File 'lib/ctioga2/commands/parsers/file.rb', line 36

def self.run_command_file(file, interpreter)
  FileParser.new.run_command_file(file, interpreter)
end

.run_commands(strings, interpreter) ⇒ Object

Runs the given command strings



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# File 'lib/ctioga2/commands/parsers/file.rb', line 41

def self.run_commands(strings, interpreter)
  FileParser.new.run_commands(strings, interpreter)
end

Instance Method Details

#parse_io_object(io, interpreter) ⇒ Object

Parses a given io object, sending commands/variable definitions to the given interpreter.



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# File 'lib/ctioga2/commands/parsers/file.rb', line 59

def parse_io_object(io, interpreter)

  # We first split everything into lines
  lines = io.readlines
  
  # First, we look for old-style commands to see if we
  # delegate to the other parser. In any case, we build up a
  # list of "unsplit" lines (ie gather lines that end with \)

  parsed_lines = []
  cur = nil 

  lines_indices = []
  idx = 0
  

  has_ruby = false
  ## @todo line counting ?
  for l in lines
    idx += 1
    # If we find something that looks like an old  command at the
    # beginning of a line, we say this is an old style file.

    ## @todo Find a way to disable this compatibility stuff --
    ## or make it more accurate ? The problem is that in a
    ## large command file, there may be things that look like
    ## old style commands ?

    if l =~ /^\s*ruby\s*$/
      has_ruby = true
    elsif l =~ /^([a-z0-9-]+)\(/ && (!has_ruby)
      path = io.respond_to?(:path) ? io.path : io.to_s
      warn { "Found old style (deprecated) commands in '#{path}', using old style parser"}
      return OldFileParser.new.
        run_commands(lines.join(""), interpreter)
    end
    if cur
      cur << l
    else
      cur = l
    end

    if cur =~ /\\$/ 
      cur.gsub!(/\\$/,'')
      cur.chomp!
    else
      # Strip all white space at the end of unfinished lines.
      parsed_lines << cur.gsub(/\s+$/,"\n")
      lines_indices << idx
      cur = nil
    end
    
  end

  # Flush any pending unfinished line
  parsed_lines << cur if cur
  lines_indices << idx if cur

  # Now, we rearrange the lines...
  idx = -1
  ruby = false

  # False, or a [var, values, code] triplet
  loop = false
  for l in parsed_lines
    idx += 1
    interpreter.context.parsing_file(nil, io, lines_indices[idx])
    if l =~ /^\s*ruby\s*$/
      ruby = ""
    elsif ruby
      if l =~ /^\s*ruby\s+end\s*$/
        begin
          Ruby.run_code(ruby)
          ruby = false
        rescue Exception => e
          fatal { "Error #{e.inspect} running inline Ruby code at #{interpreter.context}" }
        end
      else
        ruby << l
      end
    elsif l =~ /^\s*for\s+(\w+)\s+in\s+(.*)/
      v = $2
      var = $1
      v << "\n"
      s = InterpreterString.parse_until_unquoted(StringIO.new(v),"\n")
      vals = s.expand_and_split(/\s+/, interpreter)
      loop = [var, vals, ""]
    elsif loop
      if l =~ /^\s*for\s+end\s*$/
        for v in loop[1]
          interpreter.variables.define_variable(loop[0], v)
          run_commands(loop[2], interpreter)
        end
        loop = false
      else
        loop[2] << l
      end
    elsif l =~ /^\s*([a-zA-Z0-9_-]+)\s*(\??)(=|:=)\s*(.*)/
      symbol = $1
      value = InterpreterString.parse_until_unquoted(StringIO.new($4),"\n", false)
      override = !($2 == '?')
      rec = (($3 == "=") ? nil : interpreter)
      
              
      interpreter.variables.define_variable(symbol, value, rec, override)
    elsif l =~ /^\s*#/
        # comment...
    else
      l += "\n"
      str = InterpreterString.parse_until_unquoted(StringIO.new(l),"\n")
      words = str.expand_and_split(/\s+/, interpreter)

      # Take care of strings starting with spaces...
      
      if words.size == 0
        next
      end
      
      symbol = words[0]
      all_args = words[1..-1]
      
      cmd = interpreter.get_command(symbol)

      args, opts = parse_args_and_opts(cmd, all_args)

      interpreter.context.parsing_file(symbol, io, lines_indices[idx]) # Missing line number
      interpreter.run_command(cmd, args, opts)
    end
  end
end

#run_command_file(file, interpreter) ⇒ Object

Runs a command file targeting the given interpreter.



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# File 'lib/ctioga2/commands/parsers/file.rb', line 46

def run_command_file(file, interpreter)
  f = Utils::open(file)
  parse_io_object(f, interpreter)
end

#run_commands(strings, interpreter) ⇒ Object

Runs the given command strings



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# File 'lib/ctioga2/commands/parsers/file.rb', line 52

def run_commands(strings, interpreter)
  io = StringIO.new(strings)
  parse_io_object(io, interpreter)
end