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/**
* The approach here owes a LOT to https://github.com/substack/html-tokenize.
*/
var Transform = require('readable-stream').Transform;
var inherits = require('inherits');
inherits(Tokenize, Transform);
module.exports = Tokenize;
var codes = {
fslash: '/'.charCodeAt(0),
bslash: '\\'.charCodeAt(0),
lparen: '('.charCodeAt(0),
rparen: ')'.charCodeAt(0),
lbrace: '{'.charCodeAt(0),
rbrace: '}'.charCodeAt(0),
lbrack: '['.charCodeAt(0),
rbrack: ']'.charCodeAt(0),
squote: '\''.charCodeAt(0),
dquote: '"'.charCodeAt(0),
at: '@'.charCodeAt(0),
semi: ';'.charCodeAt(0),
asterisk: '*'.charCodeAt(0)
}
var sequences = {
comment_start: '/*',
comment_end: '*/'
}
function charCodes(s) { return s.split('').map(function(c){return c.charCodeAt(0)}) }
var sets = {
space: charCodes(' \t\n\r\f'),
open_brackets: [codes.lparen, codes.lbrace, codes.lbrack],
newline: charCodes('\n\r\f')
}
function Tokenize() {
if (!(this instanceof Tokenize)) return new Tokenize;
Transform.call(this);
this._readableState.objectMode = true;
this.state = [['root']];
this._input = null; // buffer the input for read-ahead
this._position = 0; // current position in this._input
this.buffers = []; // collect data for current token
}
Tokenize.prototype._transform = function(buf, enc, next) {
var input = this._input = this._input ? Buffer.concat([ this._input, buf ]) : buf;
for(var i = this._position; i < input.length; i++) {
var c = input[i];
var state = this.state[this.state.length - 1][0],
stateData = this.state[this.state.length - 1][1],
end = null;
// console.log(i, c, this.state);
/* comments */
if(i === input.length - 1
&& (('comment' === state && c === codes.asterisk)
|| c === codes.fslash)) {
// need more data: save unprocessed input and bail out.
this._input = this._input.slice(this._position);
break;
}
else if('comment' !== state
&& c === codes.fslash && input[i+1] === codes.asterisk) {
if('root' !== state) end = [].concat(state);
i--; //backup to save the '/*' for the comment token.
this.state.push(['comment'])
}
else if('comment' === state
&& c === codes.asterisk && input[i+1] === codes.fslash) {
i++;
end = this.state.pop();
}
/* strings */
else if('string' === state
&& c === stateData) {
this.state.pop();
}
else if('string' !== state
&& codes.squote === c || codes.dquote === c) {
this.state.push(['string', c]);
}
/* brackets */
// else if(codes.lparen === c) {
// this.state.push(['brackets', codes.rparen]);
// }
// else if(codes.lbrack === c) {
// this.state.push(['brackets', codes.rbrack]);
// }
// else if('brackets' === state
// && c === stateData) {
// this.state.pop();
// }
/* rules */
else if('rule_start' === state
&& c === codes.lbrace) {
end = this.state.pop();
this.state.push(['rule']);
}
else if('atrule_start' === state
&& c === codes.lbrace) {
end = this.state.pop();
this.state.push(['atrule']);
}
else if(('rule' === state || 'atrule' === state)
&& c === codes.rbrace) {
end = this.state.pop();
i--; // backup to save the ending curly brace for the rule_end token.
this.state.push([ state + '_end' ]);
}
else if(('rule_end' === state || 'atrule_end' === state)
&& c === codes.rbrace) {
end = this.state.pop();
}
else if('root' === state
&& c === codes.at) {
end = ['space'];
i--;
this.state.push(['atrule_start'])
}
// rules can start from the root or nested within at-rules.
else if(sets.space.indexOf(c) < 0)
{
if('root' === state) {
end = ['root'];
i--;
this.state.push(['rule_start'])
}
else if('atrule' === state) {
end = ['atrule'];
i--;
this.state.push(['rule_start']);
}
}
if(end && i >= this._position) {
var out;
this.push(out = [end[0], input.slice(this._position, i+1)]);
this._position = i+1;
end = null;
}
}
if(this._position < this._input.length) {
this._input = this._input.slice(this._position);
this._position = 0;
}
else {
this._input = null;
this._position = 0;
}
next();
}
Tokenize.prototype._flush = function (next) {
if(this._input)
this.push([this.state.pop()[0], this._input.slice(this._position)]);
if(this.state.length !== 0) {
console.warn("[css-tokenize] unfinished business", this.state);
}
this.push(null);
next();
};
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