Class: Rubex::Lexer

Inherits:
Object
  • Object
show all
Defined in:
lib/rubex/lexer.rex.rb

Overview

– This file is automatically generated. Do not modify it. Generated by: oedipus_lex version 2.5.0. Source: lib/rubex/lexer.rex ++

Defined Under Namespace

Classes: LexerError, ScanError

Constant Summary collapse

SELF = 
/self/
DEF = 
/def/
CFUNC = 
/cfunc/
RETURN = 
/return/
/print/
IF = 
/if/
ELSE = 
/else/
ELSIF = 
/elsif/
THEN = 
/then/
STATIC_ARRAY = 
/StaticArray/
FOR = 
/for/
WHILE = 
/while/
DO = 
/do/
EACH = 
/each/
TRUE = 
/true/
FALSE = 
/false/
NIL = 
/nil/
STRUCT = 
/struct/
UNION = 
/union/
ALIAS = 
/alias/
LIB = 
/lib/
CLASS = 
/class/
NULL = 
/NULL/
ATTACH = 
/attach/
BLOCK_GIVEN = 
/block_given\?/
NO_GIL = 
/no_gil/
REQUIRE_RUBEX = 
/require_rubex/
IDENTIFIER = 
/[a-zA-Z_][a-zA-Z_0-9]*/
COLON2 = 
/::/
LPAREN = 
/\(/
RPAREN = 
/\)/
LSQUARE = 
/\[/
RSQUARE = 
/\]/
LBRACE = 
/{/
RBRACE = 
/}/
NL = 
/\n/
COMMA = 
/,/
SQUOTE = 
/'/
DQUOTE = 
/"/
SCOLON = 
/;/
COLON = 
/:/
INTEGER = 
/-?\d+/
FLOAT = 
/-?\d+\.\d+/
DOT = 
/\./
QMARK = 
/\?/
OCTOTHORP = 
/#/
EXPO = 
/\*\*/
EXPOASSIGN = 
/\*\*=/
STAR = 
/\*/
STARASSIGN = 
/\*=/
DIVIDE = 
/\//
DIVIDEASSIGN = 
/\/=/
PLUS = 
/\+/
PLUSASSIGN = 
/\+=/
MINUS = 
/\-/
MINUSASSIGN = 
/\-=/
MODULUS = 
/%/
MODULUSASSIGN = 
/%=/
ASSIGN = 
/=/
NEQ = 
/!=/
EQ = 
/==/
LT = 
/</
LTEQ = 
/<=/
GT = 
/>/
GTEQ = 
/>=/
ANDOP = 
/&&/
OROP = 
/\|\|/
BANG = 
/!/
BIT_AND = 
/&/
BIT_AND_ASSIGN = 
/&=/
BIT_OR = 
/\|/
BIT_OR_ASSIGN = 
/\|=/
BIT_XOR = 
/\^/
BIT_XOR_ASSIGN = 
/\^=/
BIT_LSHIFT = 
/<</
BIT_LSHIFT_ASSIGN = 
/<<=/
BIT_RSHIFT = 
/>>/
BIT_RSHIFT_ASSIGN = 
/>>=/
BIT_NOT = 
/~/

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#filename ⇒ Object

Returns the value of attribute filename.



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# File 'lib/rubex/lexer.rex.rb', line 95

def filename
  @filename
end

#lineno ⇒ Object

Returns the value of attribute lineno.



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# File 'lib/rubex/lexer.rex.rb', line 94

def lineno
  @lineno
end

#ss ⇒ Object Also known as: match

Returns the value of attribute ss.



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# File 'lib/rubex/lexer.rex.rb', line 96

def ss
  @ss
end

#state ⇒ Object

Returns the value of attribute state.



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# File 'lib/rubex/lexer.rex.rb', line 97

def state
  @state
end

Instance Method Details

#action ⇒ Object 



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# File 'lib/rubex/lexer.rex.rb', line 107

def action
  yield
end

#do_parse ⇒ Object

def next_token



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# File 'lib/rubex/lexer.rex.rb', line 362

def do_parse
  self.ss.string = self.ss.string.split("\n").map! { |e| e.rstrip }.join("\n")
  self.ss << "\n"
end

#location ⇒ Object 



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# File 'lib/rubex/lexer.rex.rb', line 130

def location
  [
    (filename || "<input>"),
    lineno,
  ].compact.join(":")
end

#matches ⇒ Object 



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# File 'lib/rubex/lexer.rex.rb', line 101

def matches
  m = (1..9).map { |i| ss[i] }
  m.pop until m[-1] or m.empty?
  m
end

#next_token ⇒ Object 



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# File 'lib/rubex/lexer.rex.rb', line 137

def next_token

  token = nil

  until ss.eos? or token do
    self.lineno += 1 if ss.peek(1) == "\n"
    token =
      case state
      when nil then
        case
        when text = ss.scan(/'.\'/) then
          action { [:tSINGLE_CHAR, text] }
        when text = ss.scan(/#{FLOAT}/) then
          action { [:tFLOAT, text] }
        when text = ss.scan(/#{INTEGER}/) then
          action { [:tINTEGER, text] }
        when ss.skip(/#{DQUOTE}/) then
          action { @state = :STRING_LITERAL; @string_text = ""; nil }
        when ss.skip(/#{OCTOTHORP}/) then
          action { @state = :COMMENT; nil }
        when text = ss.scan(/#{STATIC_ARRAY}/) then
          action { [:kSTATIC_ARRAY, text] }
        when text = ss.scan(/#{FOR}/) then
          action { [:kFOR, text]    }
        when text = ss.scan(/#{WHILE}/) then
          action { [:kWHILE, text]  }
        when text = ss.scan(/#{TRUE}/) then
          action { [:kTRUE, text]   }
        when text = ss.scan(/#{FALSE}/) then
          action { [:kFALSE, text]  }
        when text = ss.scan(/#{NIL}/) then
          action { [:kNIL, text]    }
        when text = ss.scan(/#{LIB}/) then
          action { [:kLIB, text]    }
        when text = ss.scan(/#{CLASS}/) then
          action { [:kCLASS, text]  }
        when text = ss.scan(/#{NULL}/) then
          action { [:kNULL, text] }
        when text = ss.scan(/fwd/) then
          action { [:kFWD, text] }
        when text = ss.scan(/#{ATTACH}/) then
          action { [:kATTACH, text] }
        when text = ss.scan(/#{BLOCK_GIVEN}/) then
          action { [:kBLOCK_GIVEN, text] }
        when text = ss.scan(/data\$/) then
          action { [:kDATA_VAR, text] }
        when text = ss.scan(/#{REQUIRE_RUBEX}/) then
          action { [:kREQUIRE_RUBEX, text] }
        when text = ss.scan(/#{DOT}#{EACH}/) then
          action { [:kDOT_EACH, text] }
        when text = ss.scan(/unsigned long long int/) then
          action { [:kDTYPE_ULLINT, text] }
        when text = ss.scan(/unsigned long int/) then
          action { [:kDTYPE_ULINT, text] }
        when text = ss.scan(/unsigned int/) then
          action { [:kDTYPE_UINT, text] }
        when text = ss.scan(/unsigned char/) then
          action { [:kDTYPE_UCHAR, text] }
        when text = ss.scan(/long int/) then
          action { [:kDTYPE_LINT, text] }
        when text = ss.scan(/long long int/) then
          action { [:kDTYPE_LLINT, text] }
        when text = ss.scan(/#{STRUCT}\ /) then
          action { [:kSTRUCT, text] }
        when text = ss.scan(/#{UNION}\ /) then
          action { [:kUNION, text]  }
        when text = ss.scan(/#{ALIAS}\ /) then
          action { [:kALIAS, text]  }
        when text = ss.scan(/#{NO_GIL}/) then
          action { [:kNO_GIL, text] }
        when text = ss.scan(/:#{IDENTIFIER}/) then
          action { [:tSYMBOL, text] }
        when text = ss.scan(/@#{IDENTIFIER}/) then
          action { [:tINSTANCE_VAR, text] }
        when text = ss.scan(/#{IDENTIFIER}/) then
          action { [:tIDENTIFIER, text] }
        when text = ss.scan(/#{LBRACE}/) then
          action { [:tLBRACE, text] }
        when text = ss.scan(/#{RBRACE}/) then
          action { [:tRBRACE, text] }
        when text = ss.scan(/#{LPAREN}/) then
          action { [:tLPAREN, text] }
        when text = ss.scan(/#{RPAREN}/) then
          action { [:tRPAREN, text] }
        when text = ss.scan(/#{LSQUARE}/) then
          action { [:tLSQUARE, text] }
        when text = ss.scan(/#{RSQUARE}/) then
          action { [:tRSQUARE, text] }
        when text = ss.scan(/#{COMMA}/) then
          action { [:tCOMMA, text] }
        when text = ss.scan(/#{SCOLON}/) then
          action { [:tSCOLON, text] }
        when text = ss.scan(/#{NL}/) then
          action { [:tNL, text] }
        when text = ss.scan(/#{QMARK}/) then
          action { [:tQMARK, text]}
        when text = ss.scan(/#{DOT}/) then
          action { [:tDOT, text]    }
        when text = ss.scan(/#{COLON2}/) then
          action { [:tCOLON2, text]  }
        when text = ss.scan(/#{COLON}/) then
          action { [:tCOLON, text]  }
        when text = ss.scan(/#{EXPOASSIGN}/) then
          action { [:tOP_ASSIGN, text]}
        when text = ss.scan(/#{PLUSASSIGN}/) then
          action { [:tOP_ASSIGN, text]}
        when text = ss.scan(/#{MINUSASSIGN}/) then
          action { [:tOP_ASSIGN, text]}
        when text = ss.scan(/#{STARASSIGN}/) then
          action { [:tOP_ASSIGN, text]}
        when text = ss.scan(/#{DIVIDEASSIGN}/) then
          action { [:tOP_ASSIGN, text]}
        when text = ss.scan(/#{EXPOASSIGN}/) then
          action { [:tOP_ASSIGN, text]}
        when text = ss.scan(/#{MODULUSASSIGN}/) then
          action { [:tOP_ASSIGN, text]}
        when text = ss.scan(/#{EXPO}/) then
          action { [:tEXPO, text]}
        when text = ss.scan(/#{PLUS}/) then
          action { [:tPLUS, text]}
        when text = ss.scan(/#{MINUS}/) then
          action { [:tMINUS, text]}
        when text = ss.scan(/#{STAR}/) then
          action { [:tSTAR, text]}
        when text = ss.scan(/#{DIVIDE}/) then
          action { [:tDIVIDE, text]}
        when text = ss.scan(/#{MODULUS}/) then
          action { [:tMODULUS, text]}
        when text = ss.scan(/#{EXPO}/) then
          action { [:tEXPO, text]}
        when text = ss.scan(/#{EQ}/) then
          action { [:tEQ, text]  }
        when text = ss.scan(/#{NEQ}/) then
          action { [:tNEQ, text]  }
        when text = ss.scan(/#{ASSIGN}/) then
          action { [:tASSIGN, text] }
        when text = ss.scan(/#{BANG}/) then
          action { [:tBANG, text] }
        when text = ss.scan(/#{ANDOP}/) then
          action { [:tANDOP, text] }
        when text = ss.scan(/#{OROP}/) then
          action { [:tOROP, text] }
        when text = ss.scan(/#{BIT_AND_ASSIGN}/) then
          action { [:tOP_ASSIGN, text] }  
        when text = ss.scan(/#{BIT_OR_ASSIGN}/) then
          action { [:tOP_ASSIGN  , text] }
        when text = ss.scan(/#{BIT_XOR_ASSIGN}/) then
          action { [:tOP_ASSIGN , text] }
        when text = ss.scan(/#{BIT_LSHIFT_ASSIGN}/) then
          action { [:tOP_ASSIGN, text] }
        when text = ss.scan(/#{BIT_RSHIFT_ASSIGN}/) then
          action { [:tOP_ASSIGN, text] }
        when text = ss.scan(/#{BIT_AND}/) then
          action { [:tBIT_AND      , text] } 
        when text = ss.scan(/#{BIT_OR}/) then
          action { [:tBIT_OR        , text] }  
        when text = ss.scan(/#{BIT_XOR}/) then
          action { [:tBIT_XOR       , text] }  
        when text = ss.scan(/#{BIT_LSHIFT}/) then
          action { [:tBIT_LSHIFT    , text] }  
        when text = ss.scan(/#{BIT_RSHIFT}/) then
          action { [:tBIT_RSHIFT      , text] }
        when text = ss.scan(/#{BIT_NOT}/) then
          action { [:tBIT_NOT, text] }
        when text = ss.scan(/#{LTEQ}/) then
          action { [:tLTEQ, text] }
        when text = ss.scan(/#{LT}/) then
          action { [:tLT, text] }
        when text = ss.scan(/#{GTEQ}/) then
          action { [:tGTEQ, text] }
        when text = ss.scan(/#{GT}/) then
          action { [:tGT, text] }
        when ss.skip(/^\n\s*$/) then
          # do nothing
        when ss.skip(/\s+/) then
          # do nothing
        else
          text = ss.string[ss.pos .. -1]
          raise ScanError, "can not match (#{state.inspect}) at #{location}: '#{text}'"
        end
      when :STRING_LITERAL then
        case
        when ss.skip(/#{DQUOTE}/) then
          action { @state = nil; return [:tSTRING, @string_text] }
        when text = ss.scan(/[^"\\]/) then
          action { @string_text << text; nil }
        when text = ss.scan(/\\/) then
          action { @state = :STRING_LITERAL_BSLASH; @string_text << text; nil }
        else
          text = ss.string[ss.pos .. -1]
          raise ScanError, "can not match (#{state.inspect}) at #{location}: '#{text}'"
        end
      when :STRING_LITERAL_BSLASH then
        case
        when text = ss.scan(/./) then
          action { @state = :STRING_LITERAL; @string_text << text; nil }
        else
          text = ss.string[ss.pos .. -1]
          raise ScanError, "can not match (#{state.inspect}) at #{location}: '#{text}'"
        end
      when :COMMENT then
        case
        when ss.skip(/./) then
          action { @state = :COMMENT; nil }
        when ss.skip(/\n/) then
          action { @state = nil; [:tNL, "\n"] }
        else
          text = ss.string[ss.pos .. -1]
          raise ScanError, "can not match (#{state.inspect}) at #{location}: '#{text}'"
        end
      else
        raise ScanError, "undefined state at #{location}: '#{state}'"
      end # token = case state

    next unless token # allow functions to trigger redo w/ nil
  end # while

  raise LexerError, "bad lexical result at #{location}: #{token.inspect}" unless
    token.nil? || (Array === token && token.size >= 2)

  # auto-switch state
  self.state = token.last if token && token.first == :state

  token
end

#parse(str) ⇒ Object 



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# File 'lib/rubex/lexer.rex.rb', line 115

def parse str
  self.ss     = scanner_class.new str
  self.lineno = 1
  self.state  ||= nil

  do_parse
end

#parse_file(path) ⇒ Object 



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# File 'lib/rubex/lexer.rex.rb', line 123

def parse_file path
  self.filename = path
  open path do |f|
    parse f.read
  end
end

#scanner_class ⇒ Object 



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# File 'lib/rubex/lexer.rex.rb', line 111

def scanner_class
  StringScanner
end