Class: Alphabet::Reader

Inherits:
Object
  • Object
show all
Defined in:
lib/alphabets/reader.rb

Overview

todo/check: rename to CharReader or something - why? why not?

Class Method Summary collapse

Class Method Details

.parse(txt) ⇒ Object 



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# File 'lib/alphabets/reader.rb', line 10

def self.parse( txt )
  h = {}  ## char(acter) table mappings

  lineno = 0
  txt.each_line do |line|
    lineno += 1
    line = line.strip

    next if line.empty?
    next if line.start_with?( '#' )   ## skip comments too

    ## strip inline (until end-of-line) comments too
    ##  e.g  ţ  t  ## U+0163
    ##   =>  ţ  t
    line = line.sub( /#.*/, '' ).strip
    ## pp line

    values = line.split( /[ \t]+/ )
    ## pp values

    ## check - must be a even - a multiple of two
    if values.size % 2 != 0
      puts "** !!! ERROR !!! - [line:#{lineno}] missing mapping pair - mappings must be even (a multiple of two):"
      pp values
      exit 1
    end

    # add mappings in pairs
    values.each_slice(2) do |slice|
      ## pp slice
      key   = slice[0]
      value = slice[1]

      ## check - key must be a single-character/letter in unicode
      if key.size != 1
        puts "** !!! ERROR !!! - [line:#{lineno}] mapping character must be a single-character, size is #{key.size}"
        pp slice
        exit 1
      end

      ## check - check for duplicates
      if h[ key ]
        puts "** !!! ERROR !!! - [line:#{lineno}] duplicate mapping character; key already present"
        pp slice
        exit 1
      else
        h[ key ] = value
      end
    end
  end
  h
end

.read(path) ⇒ Object

use - rename to read_file or from_file etc. - why? why not?



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# File 'lib/alphabets/reader.rb', line 5

def self.read( path )   ## use - rename to read_file or from_file etc. - why? why not?
  txt = File.open( path, 'r:utf-8' ).read
  parse( txt )
end