%% @author Marc Worrell %% @copyright 2014-2025 Marc Worrell %% @doc Grammar for strict CSS parser. Based on http://www.w3.org/TR/CSS21/grammar.html %% @end %% Copyright 2014-2025 Marc Worrell %% %% Licensed under the Apache License, Version 2.0 (the "License"); %% you may not use this file except in compliance with the License. %% You may obtain a copy of the License at %% %% http://www.apache.org/licenses/LICENSE-2.0 %% %% Unless required by applicable law or agreed to in writing, software %% distributed under the License is distributed on an "AS IS" BASIS, %% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %% See the License for the specific language governing permissions and %% limitations under the License. % FLEX definition from http://www.w3.org/TR/CSS21/grammar.html Definitions. CSS_h = ([0-9a-fA-F]) CSS_nonascii = [\240-\4177777] CSS_unicode = \\{CSS_h}+[\s\r\n\f\t]? CSS_escape = ({CSS_unicode}|\\[^\r\n\f0-9a-fA-F]) CSS_nmstart = ([_a-zA-Z]|{CSS_nonascii}|{CSS_escape}) CSS_nmchar = ([_a-zA-Z0-9-]|{CSS_nonascii}|{CSS_escape}) CSS_string1 = (\"([^\n\r\f\\"]|\\{CSS_nl}|{CSS_escape})*\") CSS_string2 = (\'([^\n\r\f\\']|\\{CSS_nl}|{CSS_escape})*\') CSS_badstring1 = (\"([^\n\r\f\\"]|\\{CSS_nl}|{CSS_escape})*\\?) CSS_badstring2 = (\'([^\n\r\f\\']|\\{CSS_nl}|{CSS_escape})*\\?) CSS_badcomment1 = (\/\*[^*]*\*+([^/*][^*]*\*+)*) CSS_badcomment2 = (\/\*[^*]*(\*+[^/*][^*]*)*) CSS_baduri1 = ([uU][rR][lL]\({CSS_w}([!#$%&*-\[\]-~]|{CSS_nonascii}|{CSS_escape})*{w}) CSS_baduri2 = ([uU][rR][lL]\({CSS_w}{CSS_string}{CSS_w}) CSS_baduri3 = ([uU][rR][lL]\({CSS_w}{CSS_badstring}) CSS_comment = (\/\*[^*]*\*+([^/*][^*]*\*+)*\/) CSS_ident = (-?{CSS_nmstart}{CSS_nmchar}*) CSS_name = ({CSS_nmchar}+) CSS_num = ([0-9]+|[0-9]*\.[0-9]+) CSS_string = ({CSS_string1}|{CSS_string2}) CSS_badstring = ({CSS_badstring1}|{CSS_badstring2}) CSS_badcomment = ({CSS_badcomment1}|{CSS_badcomment2}) CSS_baduri = ({CSS_baduri1}|{CSS_baduri2}|{CSS_baduri3}) CSS_url = ([!#$%&*-~]|{CSS_nonascii}|{CSS_escape})* CSS_s = ([\s\r\n\f\t]+) CSS_w = ({CSS_s}?) CSS_nl = [\n|\r|\f] A = (a|A|\\0{0,4}(41|61)\s?) C = (c|C|\\0{0,4}(43|63)\s?) D = (d|D|\\0{0,4}(44|64)\s?) E = (e|E|\\0{0,4}(45|65)\s?) G = (g|G|\\0{0,4}(47|67)\s?|\\g|\\G) H = (h|H|\\0{0,4}(48|68)\s?|\\h|\\H) I = (i|I|\\0{0,4}(49|69)\s?|\\i|\\I) K = (k|K|\\0{0,4}(4b|6b)\s?|\\k|\\K) L = (l|L|\\0{0,4}(4c|6c)\s?|\\l|\\L) M = (m|M|\\0{0,4}(4d|6d)\s?|\\m|\\M) N = (n|N|\\0{0,4}(4e|6e)\s?|\\n|\\N) O = (o|O|\\0{0,4}(4f|6f)\s?|\\o|\\O) P = (p|P|\\0{0,4}(50|70)\s?|\\p|\\P) R = (r|R|\\0{0,4}(52|72)\s?|\\r|\\R) S = (s|S|\\0{0,4}(53|73)\s?|\\s|\\S) T = (t|T|\\0{0,4}(54|74)\s?|\\t|\\T) U = (u|U|\\0{0,4}(55|75)\s?|\\u|\\U) X = (x|X|\\0{0,4}(58|78)\s?|\\x|\\X) Z = (z|Z|\\0{0,4}(5a|7a)\s?|\\z|\\Z) %% Rules. {CSS_s} : skip_token. \/\*[^*]*\*+([^/*][^*]*\*+)*\/ : skip_token. %% /* ignore comments */ {CSS_badcomment} : make_token(badcomment, TokenLine, TokenChars). %% /* unclosed comment at EOF */ : skip_token. ~= : make_token(includes, TokenLine, TokenChars). \|= : make_token(dashmatch, TokenLine, TokenChars). {CSS_string} : make_token(string, TokenLine, TokenChars). {CSS_badstring} : make_token(bad_string, TokenLine, TokenChars). {CSS_ident} : make_token(ident, TokenLine, TokenChars). #{CSS_name} : make_token(hash, TokenLine, TokenChars). @{I}{M}{P}{O}{R}{T} : make_token(import_sym, TokenLine, TokenChars). @{P}{A}{G}{E} : make_token(page_sym, TokenLine, TokenChars). @{M}{E}{D}{I}{A} : make_token(media_sym, TokenLine, TokenChars). @{C}{H}{A}{R}{S}{E}{T}\s : make_token(charset_sym, TokenLine, TokenChars). !({w}|{CSS_comment})*{I}{M}{P}{O}{R}{T}{A}{N}{T} : make_token(important_sym, TokenLine, TokenChars). {CSS_num}{E}{M} : make_token(ems, TokenLine, TokenChars). {CSS_num}{E}{X} : make_token(exs, TokenLine, TokenChars). {CSS_num}{P}{X} : make_token(length, TokenLine, TokenChars). {CSS_num}{C}{M} : make_token(length, TokenLine, TokenChars). {CSS_num}{M}{M} : make_token(length, TokenLine, TokenChars). {CSS_num}{I}{N} : make_token(length, TokenLine, TokenChars). {CSS_num}{P}{T} : make_token(length, TokenLine, TokenChars). {CSS_num}{P}{C} : make_token(length, TokenLine, TokenChars). {CSS_num}{D}{E}{G} : make_token(angle, TokenLine, TokenChars). {CSS_num}{R}{A}{D} : make_token(angle, TokenLine, TokenChars). {CSS_num}{G}{R}{A}{D} : make_token(angle, TokenLine, TokenChars). {CSS_num}{M}{S} : make_token(time, TokenLine, TokenChars). {CSS_num}{S} : make_token(time, TokenLine, TokenChars). {CSS_num}{H}{Z} : make_token(freq, TokenLine, TokenChars). {CSS_num}{K}{H}{Z} : make_token(freq, TokenLine, TokenChars). {CSS_num}{CSS_ident} : make_token(dimension, TokenLine, TokenChars). {CSS_num}% : make_token(percentage, TokenLine, TokenChars). {CSS_num} : make_token(number, TokenLine, TokenChars). [uU][rR][lL]\({CSS_w}{CSS_string}{CSS_w}\) : make_token(uri, TokenLine, TokenChars). [uU][rR][lL]\({CSS_w}{CSS_url}{CSS_w}\) : make_token(uri, TokenLine, TokenChars). {CSS_baduri} : make_token(bad_uri, TokenLine, TokenChars). {CSS_ident}\( : make_token(function, TokenLine, TokenChars). . : make_token(literal, TokenLine, TokenChars). % **yytext Erlang code. make_token(literal, Line, ";") -> {token, {';', Line, ";"}}; make_token(literal, Line, "{") -> {token, {'{', Line, "{"}}; make_token(literal, Line, "}") -> {token, {'}', Line, "}"}}; make_token(literal, Line, "[") -> {token, {'[', Line, "["}}; make_token(literal, Line, "]") -> {token, {']', Line, "]"}}; make_token(literal, Line, "(") -> {token, {'(', Line, "("}}; make_token(literal, Line, ")") -> {token, {')', Line, ")"}}; make_token(literal, Line, ",") -> {token, {',', Line, ","}}; make_token(literal, Line, ".") -> {token, {'.', Line, "."}}; make_token(literal, Line, ":") -> {token, {':', Line, ":"}}; make_token(literal, Line, "/") -> {token, {'/', Line, "/"}}; make_token(literal, Line, "-") -> {token, {'-', Line, "-"}}; make_token(literal, Line, "+") -> {token, {'+', Line, "+"}}; make_token(literal, Line, "*") -> {token, {'*', Line, "*"}}; make_token(literal, Line, ">") -> {token, {'>', Line, ">"}}; make_token(literal, Line, "=") -> {token, {'=', Line, "="}}; make_token(literal, Line, [Char] = Chars) -> {token, {Char, Line, Chars}}; make_token(Name, Line, Chars) -> {token, {Name, Line, Chars}}.