Class: FortranFormatScanner

Inherits:
Object
  • Object
show all
Defined in:
ext/fortio/lib/fortio/fortran_format.tab.rb

Instance Method Summary collapse

Constructor Details

#initialize(text) ⇒ FortranFormatScanner

Returns a new instance of FortranFormatScanner.



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# File 'ext/fortio/lib/fortio/fortran_format.tab.rb', line 14

def initialize (text)
  @s = StringScanner.new(text)
end

Instance Method Details

#yylex ⇒ Object 



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# File 'ext/fortio/lib/fortio/fortran_format.tab.rb', line 18

def yylex
  while @s.rest?
    case
    when @s.scan(/\A(ES|[FEDG])(\d+)\.(\d+)/i) ### {F|E|D|G|ES}w.d
      return [
        @s[1].upcase.to_sym, 
        [
          @s[2].to_i, 
          @s[3].to_i
        ]
      ]
    when @s.scan(/\AE(\d+)/i)               ### Ed (for exponential)
      return [
        :EXP,
        @s[1].to_i
      ]
    when @s.scan(/\AI(\d+)(\.(\d+))?/i)     ### Iw(.d)
      return [
        :I, 
        [
          @s[1].to_i, 
          @s[3] ? @s[3].to_i : nil
        ]
      ]
    when @s.scan(/\AL(\d+)?/i)              ### L(w)
      return [
        :L, 
        @s[1] ? @s[1].to_i : nil
      ]
    when @s.scan(/\AA(\d+)?/i)              ### A(w)
      return [
        :A, 
        @s[1] ? @s[1].to_i : nil
      ]
    when @s.scan(/\AX/i)                    ### X
      return [
        :X,
        nil
      ]
    when @s.scan(/\ATL(\d+)?/i)             ### TLw
      return [
        :TL,
        @s[1] ? @s[1].to_i : 1
      ]
    when @s.scan(/\ATR(\d+)?/i)             ### TRw
      return [
        :TR,
        @s[1] ? @s[1].to_i : 1
      ]
    when @s.scan(/\AT(\d+)?/i)              ### Tw
      return [
        :T,
        @s[1] ? @s[1].to_i : 1
      ]
    when @s.scan(/\A([+-]?\d+)P/i)          ### {+|-|}P
      return [
        :P,
        @s[1].to_i
      ]
    when @s.scan(/\AS[PS]?/i)               ### S,SP,SS
      return [
        :Sp,
        @s[0] =~ /SP/i ? true : false
      ]
    when @s.scan(/\AB[NZ]/i)                ### BN,BZ
      return [
        :B,
        @s[0] =~ /BZ/i ? true : false
      ]
    when @s.match?(/\A(\d+)?H/i)            ### Hollerith 
      count  = @s[1] ? @s[1].to_i : 1
      if @s.scan(/\A(\d+)?H(.{#{count}})/)
        return [
          :H,
          [count, @s[2]]
        ]
     else
      raise "invalid horeris descriptor"
      end
    when @s.scan(/\A'((?:''|[^'])*)'/)      ### 'quoted string'
      return [
        :STRING, 
        @s[1].gsub(/''/, "'")
      ]
    when @s.scan(/\A"((?:""|[^"])*)"/)      ### 'double-quoted string'
      return [
        :STRING, 
        @s[1].gsub(/""/, '"')
      ]
    when @s.scan(/\A(\d+)/)                 ### digits
      return [
        :DIGITS, 
        @s[1].to_i
      ]
    when @s.scan(/\A([\(\)\/\$\:])/)        ### {(|)|/|$}
      return [
        @s[1], 
        nil
      ]
    when @s.scan(/:/)
     raise("format descriptor ':' is not supported.")
    when @s.scan(/\A,/)                     ### blank
      next
    when @s.scan(/\A\s+/)                   ### blank
      next
    else
      raise "FortranFormat parse error\n\t#{@s.string}\n\t#{' '*@s.pos}^"
    end
  end
end