Module: MathML::LaTeX::BuiltinGroups

Included in:

Parser

Defined in:

lib/math_ml.rb,
lib/math_ml.rb

Defined Under Namespace

Classes: CircularReferenceEnvironment

Instance Method Summary

• #add_environment(*a) ⇒ Object
• #grp_begin ⇒ Object
• #grp_left_etc ⇒ Object
• #initialize ⇒ Object

Instance Method Details

#add_environment(*a) ⇒ Object

# File 'lib/math_ml.rb', line 1078

def add_environment(*a)
  @environments = Hash.new unless @environments
  if a.size==1 && Hash===a[0]
    @environments.merge!(hash)
  else
    a.each{|i| @environments[i] = false}
  end
end

#grp_begin ⇒ Object

Raises:

• (ParseError)

# File 'lib/math_ml.rb', line 1087

def grp_begin
  matched = @scanner.matched
  begin_pos = @scanner.pos-matched.size
  en = @scanner.scan_block ? @scanner[1] : @scanner.scan_any
  raise ParseError.new('Environment name not exist.') unless en

  macro = @macro.environments(en)
  if macro
    begin
      flg = @expanded_environment.include?(en)
      @expanded_environment.push(en)
      raise CircularReferenceEnvironment if flg

      pos = @scanner.pos
      option = (macro.option && @scanner.scan_option) ? @scanner[1] : nil
      params = Array.new
      (1..macro.num).each do
        params << (@scanner.scan_block ? @scanner[1] : @scanner.scan_any)
        raise ParseError.new("Need more parameter.") unless params.last
      end
      body = ""
      grpnest = 0
      until @scanner.peek_command=="end" && grpnest==0
        if @scanner.eos?
          @scanner.pos = pos
          raise ParseError.new('Matching \end not exist.')
        end
        com = @scanner.peek_command
        grpnest += 1 if @group_begins.has_key?(com)
        grpnest -=1 if @group_ends.has_key?(com) && @group_begins[com]
        raise ParseError.new("Syntax error.") if grpnest<0
        
        body << @scanner.scan_any(true)
      end
      @scanner.scan_command
      raise ParseError.new("Environment mismatched.", @scanner.matched) unless en==(@scanner.scan_block ? @scanner[1] : @scanner.scan_any)
      begin
        return parse_into(@macro.expand_environment(en, body, params, option), Array.new)
      rescue CircularReferenceEnvironment
        if @expanded_environment.size>1
          raise
        else
          @scanner.pos = begin_pos
          raise ParseError.new("Circular reference.")
        end
      rescue ParseError => e
        if @expanded_environment.size>1
          raise
        else
          @scanner.pos = begin_pos
          raise ParseError.new(%[Error in macro(#{e.message} "#{e.rest.strip}").])
        end
      end
    ensure
      @expanded_environment.pop
    end
  end

  raise ParseError.new("Undefined environment.") unless @environments.has_key?(en)
  e = @environments[en]
  e = en unless e # default method name
  __send__("env_#{e.to_s}")
end

#grp_left_etc ⇒ Object

Raises:

• (ParseError)

# File 'lib/math_ml.rb', line 1151

def grp_left_etc
  right =
    case @scanner[1]
    when "left"
      "right"
    when "bigg"
      "bigg"
    end

  f = Fenced.new
  p = @scanner.pos
  o = @scanner.scan_any
  raise ParseError.new('Need brace here.') unless o && (o=~RE::BRACES || @delimiters.include?(o[RE::COMMANDS, 1]))

  f.open = (o=~RE::BRACES ? o : parse_symbol_command(o[RE::COMMANDS, 1], true))
  f << push_container(Row.new) do |r|
    until @scanner.peek_command==right
      if @scanner.eos?
        @scanner.pos = p
        raise ParseError.new('Brace not closed.')
      end
      r << parse_to_element(true)
    end
  end
  @scanner.scan_command # skip right
  c = @scanner.scan_any
  raise ParseError.new('Need brace here.') unless c=~RE::BRACES || @delimiters.include?(c[RE::COMMANDS, 1])
  f.close = (c=~RE::BRACES ? c : parse_symbol_command(c[RE::COMMANDS, 1], true))
  f
end

#initialize ⇒ Object

# File 'lib/math_ml.rb', line 1069

def initialize
  add_group("begin", "end")
  add_group("left", "right", :left_etc)
  add_group("bigg", "bigg", :left_etc)
  @environments = Hash.new

  super
end