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floki

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Floki is a simple HTML parser that enables search for nodes using CSS selectors.

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floki src floki_selector_lexer.xrl
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src/floki_selector_lexer.xrl 

Definitions.



IDENTIFIER = [-A-Za-z0-9_]+

QUOTED = (\"[^"]*\"|\'[^']*\')

PARENTESIS = \([^)]*\)

INT = [0-9]+

NOT = (n|N)(o|O)(t|T)

ODD = (o|O)(d|D)(d|D)

EVEN = (e|E)(v|V)(e|E)(n|N)

PSEUDO_PATT = (\+|-)?({INT})?(n|N)((\+|-){INT})?

SYMBOL = [\[\]*]

W = [\s\t\r\n\f]



Rules.



{IDENTIFIER}                         : {token, {identifier, TokenLine, TokenChars}}.

{QUOTED}                             : {token, {quoted, TokenLine, remove_wrapper(TokenChars)}}.

{SYMBOL}                             : {token, {TokenChars, TokenLine}}.

#{IDENTIFIER}                        : {token, {hash, TokenLine, tail(TokenChars)}}.

\.{IDENTIFIER}                       : {token, {class, TokenLine, tail(TokenChars)}}.

\:{NOT}\(                            : {token, {pseudo_not, TokenLine}}.

\:{IDENTIFIER}                       : {token, {pseudo, TokenLine, tail(TokenChars)}}.

\({INT}\)                            : {token, {pseudo_class_int, TokenLine, list_to_integer(remove_wrapper(TokenChars))}}.

\({ODD}\)                            : {token, {pseudo_class_odd, TokenLine}}.

\({EVEN}\)                           : {token, {pseudo_class_even, TokenLine}}.

\({PSEUDO_PATT}\)                    : {token, {pseudo_class_pattern, TokenLine, remove_wrapper(TokenChars)}}.

\({QUOTED}\)                         : {token, {pseudo_class_quoted, TokenLine, remove_wrapper(remove_wrapper(TokenChars))}}.

{W}*\)                               : {token, {close_parentesis, TokenLine}}.

~=                                   : {token, {includes, TokenLine}}.

\|=                                  : {token, {dash_match, TokenLine}}.

\^=                                  : {token, {prefix_match, TokenLine}}.

\$=                                  : {token, {sufix_match, TokenLine}}.

\*=                                  : {token, {substring_match, TokenLine}}.

=                                    : {token, {equal, TokenLine}}.

{W}*,{W}*                            : {token, {comma, TokenLine}}.

{W}*>{W}*                            : {token, {greater, TokenLine}}.

{W}*\+{W}*                           : {token, {plus, TokenLine}}.

{W}*~{W}*                            : {token, {tilde, TokenLine}}.

{W}*\|{W}*                           : {token, {namespace_pipe, TokenLine}}.

{W}+                                 : {token, {space, TokenLine}}.

.                                    : {token, {unknown, TokenLine, TokenChars}}.



Erlang code.



remove_wrapper(Chars) ->

  Len = string:len(Chars),

  string:substr(Chars, 2, Len - 2).



tail([_|T]) ->

  T.