Class: MathML::LaTeX::Macro

Inherits:

Object

• Object
• MathML::LaTeX::Macro

Defined in:

lib/math_ml/latex.rb

Defined Under Namespace

Classes: Command, Environment

Instance Method Summary

• #check_parameter_numbers(src, opt, whole) ⇒ Object
• #commands(com) ⇒ Object
• #environments(env) ⇒ Object
• #expand_command(com, params, opt = nil) ⇒ Object
• #expand_environment(env, body, params, opt = nil) ⇒ Object
• #initialize ⇒ Macro constructor

  A new instance of Macro.

• #parse(src) ⇒ Object
• #parse_error(message, rest = "", whole = nil) ⇒ Object
• #parse_newcommand ⇒ Object
• #parse_newenvironment ⇒ Object
• #scan_num_of_parameter ⇒ Object

Constructor Details

#initialize ⇒ Macro

Returns a new instance of Macro.

# File 'lib/math_ml/latex.rb', line 185

def initialize
	@commands = Hash.new
	@environments = Hash.new
end

Instance Method Details

#check_parameter_numbers(src, opt, whole) ⇒ Object

# File 'lib/math_ml/latex.rb', line 228

def check_parameter_numbers(src, opt, whole)
	s = Scanner.new(src)
	until s.eos?
		case
		when s.scan(/#{MBEC}*?\#(\d+|.)/)
			raise parse_error("Need positive number.") unless s[1]=~/\d+/
			raise parse_error("Parameter \# too large.", s[1]+s.rest, whole) if s[1].to_i>opt
		else
			return nil
		end
	end
end

#commands(com) ⇒ Object

# File 'lib/math_ml/latex.rb', line 300

def commands(com)
	@commands[com]
end

#environments(env) ⇒ Object

# File 'lib/math_ml/latex.rb', line 316

def environments(env)
	@environments[env]
end

#expand_command(com, params, opt = nil) ⇒ Object

Raises:

• (ParseError)

# File 'lib/math_ml/latex.rb', line 304

def expand_command(com, params, opt=nil)
	return nil unless @commands.has_key?(com)
	c = @commands[com]
	opt = c.option if c.option && !opt
	params.unshift(opt) if c.option
	raise ParseError.new("Need more parameter.") if params.size < c.num

	c.body.gsub(/(#{MBEC}*?)\#(\d+)/) do
		$1.to_s << params[$2.to_i-1]
	end
end

#expand_environment(env, body, params, opt = nil) ⇒ Object

Raises:

• (ParseError)

# File 'lib/math_ml/latex.rb', line 320

def expand_environment(env, body, params, opt=nil)
	return nil unless @environments.has_key?(env)
	e = @environments[env]
	opt = e.option if e.option && !opt
	params.unshift(opt) if e.option
	raise ParseError.new("Need more parameter.") if params.size < e.num

	bg = e.beginning.gsub(/(#{MBEC}*?)\#(\d+)/) do
		$1.to_s << params[$2.to_i-1]
	end

	en = e.ending.gsub(/(#{MBEC}*?)\#(\d+)/) do
		$1.to_s << params[$2.to_i-1]
	end

	" #{bg} #{body} #{en} "
end

#parse(src) ⇒ Object

# File 'lib/math_ml/latex.rb', line 197

def parse(src)
	@scanner = Scanner.new(src)
	until @scanner.eos?
		unless @scanner.scan_command
			@scanner.scan_space
			raise parse_error("Syntax error.")
		end
		case @scanner[1]
		when "newcommand"
			parse_newcommand
		when "newenvironment"
			parse_newenvironment
		else
			raise parse_error("Syntax error.", @scanner.matched)
		end
	end
rescue BlockNotClosed => e
	raise parse_error("Block not closed.")
rescue OptionNotClosed => e
	raise parse_error("Option not closed.")
end

#parse_error(message, rest = "", whole = nil) ⇒ Object

# File 'lib/math_ml/latex.rb', line 190

def parse_error(message, rest="", whole=nil)
	rest = whole[/\A.*?(#{Regexp.escape(rest)}.*\z)/, 1] if whole
	rest << @scanner.rest
	done = @scanner.string[0, @scanner.string.size-rest.size]
	ParseError.new(message, rest, done)
end

#parse_newcommand ⇒ Object

# File 'lib/math_ml/latex.rb', line 241

def parse_newcommand
	case
	when @scanner.scan_block
		s = Scanner.new(@scanner[1])
		raise parse_error("Need newcommand.", s.rest+"}") unless s.scan_command
		com = s[1]
		raise parse_error("Syntax error." ,s.rest+"}") unless s.eos?
	when @scanner.scan_command
		s = Scanner.new(@scanner[1])
		com = s.scan_command
	else
		raise parse_error("Need newcommand.")
	end

	optnum = scan_num_of_parameter
	opt = @scanner.scan_option ? @scanner[1] : nil

	case
	when @scanner.scan_block
		body = @scanner[1]
	when @scanner.scan_command
		body = @scanner.matched
	else
		body = @scanner.scan(/./)
	end

	raise parse_error("Need parameter.") unless body

	check_parameter_numbers(body, optnum, @scanner.matched)

	optnum-=1 if opt
	@commands[com] = Command.new(optnum, body, opt)
end

#parse_newenvironment ⇒ Object

# File 'lib/math_ml/latex.rb', line 275

def parse_newenvironment
	case
	when @scanner.scan_block
		env = @scanner[1]
	when @scanner.scan_command
		raise ParseError.new
	when @scanner.scan(/./)
		env = @scanner.matched
	end
	raise parse_error("Syntax error.", env[/\A.*?(\\.*\z)/, 1], @scanner.matched) if env=~/\\/

	optnum = scan_num_of_parameter
	opt = @scanner.scan_option ? @scanner[1] : nil

	b = @scanner.scan_block ? @scanner[1] : @scanner.scan_any
	raise parse_error("Need begin block.") unless b
	check_parameter_numbers(b, optnum, @scanner.matched)
	e = @scanner.scan_block ? @scanner[1] : @scanner.scan_any
	raise parse_error("Need end block.") unless e
	check_parameter_numbers(e, optnum, @scanner.matched)

	optnum -= 1 if opt
	@environments[env] = Environment.new(optnum, b, e, opt)
end

#scan_num_of_parameter ⇒ Object

# File 'lib/math_ml/latex.rb', line 219

def scan_num_of_parameter
	if @scanner.scan_option
		raise parse_error("Need positive number.", @scanner[1]+"]") unless @scanner[1]=~/\A#{RE::SPACE}*\d+#{RE::SPACE}*\z/
		@scanner[1].to_i
	else
		0
	end
end