Class: MathML::LaTeX::Macro
- Inherits:
-
Object
- Object
- MathML::LaTeX::Macro
show all
- Defined in:
- lib/math_ml/latex.rb
Defined Under Namespace
Classes: Command, Environment
Instance Method Summary
collapse
Constructor Details
#initialize ⇒ Macro
Returns a new instance of Macro.
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# File 'lib/math_ml/latex.rb', line 185
def initialize
@commands = Hash.new
@environments = Hash.new
end
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Instance Method Details
#check_parameter_numbers(src, opt, whole) ⇒ Object
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# 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
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#commands(com) ⇒ Object
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# File 'lib/math_ml/latex.rb', line 300
def commands(com)
@commands[com]
end
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#environments(env) ⇒ Object
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# File 'lib/math_ml/latex.rb', line 316
def environments(env)
@environments[env]
end
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#expand_command(com, params, opt = nil) ⇒ Object
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# 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
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#expand_environment(env, body, params, opt = nil) ⇒ Object
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# 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
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#parse(src) ⇒ Object
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# 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
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#parse_error(message, rest = "", whole = nil) ⇒ Object
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# 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
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#parse_newcommand ⇒ Object
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# 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
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#parse_newenvironment ⇒ Object
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# 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
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#scan_num_of_parameter ⇒ Object
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# 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
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