Class: WMLAction::Parser

Inherits:
Racc::Parser
  • Object
show all
Defined in:
lib/wml_action/lexer.rex.rb,
lib/wml_action/parser.tab.rb

Defined Under Namespace

Classes: ScanError

Constant Summary collapse

OTAG = 
/\[(\w+)\]/
CTAG = 
/\[\/(\w+)\]/
ATTR = 
/(\w+)=/
MACRO = 
/\{.+\}/
ANUMBER = 
/-?\d+(\.\d+)?/
ASTR = 
/"[^"]*"/
APLAIN = 
/.+/
SLASH = 
/\//
COMMENT = 
/\#.*$/
BACKQ = 
/\`/
VAR = 
/[\w]+/
BLANK = 
/[ \t]+/
Racc_arg = 
[
racc_action_table,
racc_action_check,
racc_action_default,
racc_action_pointer,
racc_goto_table,
racc_goto_check,
racc_goto_default,
racc_goto_pointer,
racc_nt_base,
racc_reduce_table,
racc_token_table,
racc_shift_n,
racc_reduce_n,
racc_use_result_var ]
Racc_token_to_s_table = 
[
"$end",
"error",
"EUMIN",
"\"*\"",
"\"/\"",
"\"+\"",
"\"-\"",
"\".\"",
"OTAG",
"CTAG",
"MACRO",
"BACKQ",
"EPLUS",
"EMINUS",
"EMUL",
"EDIV",
"EDOT",
"ENUMBER",
"\"(\"",
"\")\"",
"ESTR",
"ENUM",
"EVAR",
"ATTR",
"APLAIN",
"AMACRO",
"ANUMBER",
"ASTR",
"UNDERSC",
"APLUS",
"SLASH",
"$start",
"target",
"wml_doc",
"tag",
"contents",
"content",
"action",
"attribute",
"filter",
"expression",
"expr",
"aop",
"string_val" ]
Racc_debug_parser = 
false

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/wml_action/lexer.rex.rb', line 31

def filename
  @filename
end

#lineno ⇒ Object

Returns the value of attribute lineno.



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# File 'lib/wml_action/lexer.rex.rb', line 30

def lineno
  @lineno
end

#ss ⇒ Object Also known as: match

Returns the value of attribute ss.



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# File 'lib/wml_action/lexer.rex.rb', line 32

def ss
  @ss
end

#state ⇒ Object

Returns the value of attribute state.



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# File 'lib/wml_action/lexer.rex.rb', line 33

def state
  @state
end

Instance Method Details

#_reduce_none(val, _values, result) ⇒ Object 



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# File 'lib/wml_action/parser.tab.rb', line 463

def _reduce_none(val, _values, result)
  val[0]
end

#action ⇒ Object 



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# File 'lib/wml_action/lexer.rex.rb', line 43

def action
  yield
end

#matches ⇒ Object 



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# File 'lib/wml_action/lexer.rex.rb', line 37

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/wml_action/lexer.rex.rb', line 66

def next_token

  token = nil

  until ss.eos? or token do
    token =
      case state
      when nil then
        case
        when text = ss.scan(/#{COMMENT}/) then
          # do nothing
        when text = ss.scan(/#{OTAG}/) then
          action { [:OTAG, match[1]] }
        when text = ss.scan(/#{CTAG}/) then
          action { [:CTAG, match[1]] }
        when text = ss.scan(/#{ATTR}/) then
          action { @state = :INATTR; [:ATTR, match[1]] }
        when text = ss.scan(/#{MACRO}/) then
          action { [:MACRO, text] }
        when text = ss.scan(/#{SLASH}/) then
          action { [:SLASH, text] }
        when text = ss.scan(/\-/) then
          action { [text,text] }
        when text = ss.scan(/\+/) then
          action { [text,text] }
        when text = ss.scan(/./) then
          # do nothing
        when text = ss.scan(/\n/) then
          # do nothing
        else
          text = ss.string[ss.pos .. -1]
          raise ScanError, "can not match (#{state.inspect}): '#{text}'"
        end
      when :INATTR then
        case
        when text = ss.scan(/\n/) then
          action { @state = nil }
        when text = ss.scan(/#{BLANK}/) then
          # do nothing
        when text = ss.scan(/#{ANUMBER}\s+/) then
          action { @state = nil; [:ANUMBER, text.to_i] }
        when text = ss.scan(/#{ASTR}/) then
          action { [:ASTR, text] }
        when text = ss.scan(/#{MACRO}/) then
          action { [:AMACRO, text] }
        when text = ss.scan(/_/) then
          action { [:UNDERSC, text] }
        when text = ss.scan(/\+/) then
          action { [:APLUS, text] }
        when text = ss.scan(/#{BACKQ}/) then
          action { @state = :INEXPR; [:BACKQ, text] }
        when text = ss.scan(/#{APLAIN}/) then
          action { [:APLAIN, text] }
        else
          text = ss.string[ss.pos .. -1]
          raise ScanError, "can not match (#{state.inspect}): '#{text}'"
        end
      when :INEXPR then
        case
        when text = ss.scan(/#{BACKQ}/) then
          action { @state = nil; [:BACKQ, text] }
        when text = ss.scan(/\+/) then
          action { [:EPLUS,text] }
        when text = ss.scan(/\*/) then
          action { [:EMUL,text] } 
        when text = ss.scan(/\//) then
          action { [:EDIV,text] }
        when text = ss.scan(/\-/) then
          action { [:EMINUS,text] }
        when text = ss.scan(/\./) then
          action { [:EDOT,text] }
        when text = ss.scan(/\(/) then
          action { [text,text] }
        when text = ss.scan(/\)/) then
          action { [text,text] }
        when text = ss.scan(/#{ANUMBER}/) then
          action { [:ENUM,text.to_f] }
        when text = ss.scan(/#{ASTR}/) then
          action { [:ESTR,text.slice(1..-2)] }
        when text = ss.scan(/#{VAR}/) then
          action { [:EVAR,text] }
        else
          text = ss.string[ss.pos .. -1]
          raise ScanError, "can not match (#{state.inspect}): '#{text}'"
        end
      else
        raise ScanError, "undefined state: '#{state}'"
      end # token = case state

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

  raise "bad lexical result: #{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/wml_action/lexer.rex.rb', line 51

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/wml_action/lexer.rex.rb', line 59

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/wml_action/lexer.rex.rb', line 47

def scanner_class
  StringScanner
end