from pygments.lexer import RegexLexer, bygroups
from pygments.token import *

class VSLLexer(RegexLexer):
    name        = "VSL"
    aliases     = ["vsl"]
    filenames   = ["*.vsl"]

    tokens = {
        "root": [
            (r"[\ \t\v\r\n]+", Whitespace),
            (r"\/\/[^\n]+", Comment.Single),
            (r"var", Keyword.Declaration),
            (r"func|print|return|continue|if|then|else|while|do|begin|end", Keyword),
            (r"\^|\||:|=|\+|-|\*|\/|<|>|&", Operator),
            (r"[0-9]+", Number.Integer),
            (r"([A-Za-z_][0-9A-Za-z_]*)([\ \t\v\r\n]*)(\()", bygroups(Name.Function, Whitespace, Punctuation)),
            (r"\(|\)|\[|\]|{|}", Punctuation),
            (r"[A-Za-z_][0-9A-Za-z_]*", Name.Variable),
            (r"\"([^\"\n]|\\\")*\"", String),
            (r".", Text),
        ]
    }