Module: MathML::LaTeX::BuiltinGroups

Included in:

Parser

Defined in:

lib/math_ml/latex.rb,
lib/math_ml/latex.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/latex.rb', line 839

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/latex.rb', line 848

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/latex.rb', line 912

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/latex.rb', line 830

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

	super
end