, I realized it quickly that C# isn't the best language to do code generation. The main block was that it is too verbose to do regular expression on strings. I had to use Regex.IsMatch and then Regex.Split to get the the tokens. Thats when I looked into ruby.Regular expressions is a built in feature of Ruby, put between two forward slashes (/). You can use =~ operator for a regex match which sets the special variables $~. $& holds the text matched by the whole regular expression. $1, $2, etc. hold the text matched by the first, second, and following capturing groups. Some good info here.
class CSharpCode
def BlankLine
print "\n"
end
def Comment comment
print "// #{comment}\n"
end
def StartMsg name
print "public struct #{name} {\n"
end
def EndMsg
print "}\n"
end
def SimpleType name, type
print "\t#{type} #{name};\n"
end
def ComplexType name, type, size
if(type == "char[")
type = "string"
print "\t#{type} #{name};\n"
end
end
end
if __FILE__ == $0
unless ARGV[0]
print "cml usage: cml Input.txt\n"
exit
end
if(File.exist?(ARGV[0]))
CG = CSharpCode.new
File.open(ARGV[0]).each_line { |line|
line.chomp!;
if(line =~ /^\s*S/)
CG.BlankLine
elsif line =~ /^\#(.*)/
CG.Comment $1
elsif line =~ /^M\s*(.+)/
CG.StartMsg $1
elsif line =~ /^E/
CG.EndMsg
elsif line =~ /F\s*(\w+)\s*(\w+\[)(\d+)\]/
CG.ComplexType $1, $2, $3
elsif line =~ /^F\s+(\w+)\s*(\w+)/
CG.SimpleType $1, $2
else
print "Invalid line"
end
}
end
end
Input File
# Add a product # to the 'on-order' list M AddProduct F id int F name char[30] F order_code int EOutput
// Add a product
// to the 'on-order' list
public struct AddProduct {
int id;
string name;
int order_code;
}