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Lexical analyser
================
This document contains various snippets of information about the lexer
implementation.
First sets
----------
IDENT [a-zA-Z] | '-' | '_' | [^#x0-#x7F] | '\'
ATKEYWORD '@'
STRING '"' | "'"
INVALID_STRING '"' | "'"
HASH '#'
NUMBER [0-9] | '.' | '-' | '+'
PERCENTAGE [0-9] | '.' | '-' | '+'
DIMENSION [0-9] | '.'
URI [Uu]
UNICODE-RANGE [Uu]
CDO '<'
CDC '-'
S #x9 | #xA | #xC | #xD | #x20
COMMENT '/'
FUNCTION [a-zA-Z] | '-' | '_' | [^#x0-#x7F] | '\'
INCLUDES '~'
DASHMATCH '|'
PREFIXMATCH '^'
SUFFIXMATCH '$'
SUBSTRINGMATCH '*'
CHAR anything except " or '
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