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Zotonic standard library
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src/z_css_lexer.xrl
%% @author Marc Worrell <marc@worrell.nl>
%% @copyright 2014 Marc Worrell
%%
%% @doc Grammar for strict CSS parser. Based on http://www.w3.org/TR/CSS21/grammar.html
%% Copyright 2014 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.
--> : 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}}.