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|
# $Id$
#
# Converting Hash-like string into Ruby's Hash.
class HashParser
options no_result_var
rule
hash : '{' contents '}' { val[1] }
| '{' '}' { Hash.new }
# Racc can handle string over 2 bytes.
contents: IDENT '=>' IDENT { {val[0] => val[2]} }
| contents ',' IDENT '=>' IDENT { val[0][val[2]] = val[4]; val[0] }
end
---- inner
def parse(str)
@str = str
yyparse self, :scan
end
private
def scan
str = @str
until str.empty?
case str
when /\A\s+/
str = $'
when /\A\w+/
yield :IDENT, $&
str = $'
when /\A=>/
yield '=>', '=>'
str = $'
else
c = str[0,1]
yield c, c
str = str[1..-1]
end
end
yield false, '$' # is optional from Racc 1.3.7
end
---- footer
if $0 == __FILE__
src = <<EOS
{
name => MyName,
id => MyIdent
}
EOS
puts 'Parsing (String):'
print src
puts
puts 'Result (Ruby Object):'
p HashParser.new.parse(src)
end
|
