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if (typeof module === 'object' && typeof define !== 'function') {
var define = function (factory) {
module.exports = factory(require, exports, module);
};
}
define(function(require, exports, module) {
var session = {tokens: null};
// walks around the source
var walker = {
init: function (source) {
// this.source = source.replace(/\r\n?/g, '\n');
this.source = source;
this.ch = '';
this.chnum = -1;
// advance
this.nextChar();
},
nextChar: function () {
return this.ch = this.source.charAt(++this.chnum);
},
peek: function() {
return this.source.charAt(this.chnum + 1);
}
};
// utility helpers
function isNameChar(c, cc) {
cc = cc || c.charCodeAt(0);
return (
(cc >= 97 && cc <= 122 /* a-z */) ||
(cc >= 65 && cc <= 90 /* A-Z */) ||
/*
Experimental: include cyrillic ranges
since some letters, similar to latin ones, can
accidentally appear in CSS tokens
*/
(cc >= 1024 && cc <= 1279) ||
c === '&' || /* selector placeholder (LESS, SCSS) */
c === '_' ||
c === '<' || /* comparisons (LESS, SCSS) */
c === '>' ||
c === '=' ||
c === '-'
);
}
function isDigit(c, cc) {
cc = cc || c.charCodeAt(0);
return (cc >= 48 && cc <= 57);
}
var isOp = (function () {
var opsa = "{}[]()+*=.,;:>~|\\%$#@^!".split(''),
opsmatcha = "*^|$~".split(''),
ops = {},
opsmatch = {},
i = 0;
for (; i < opsa.length; i += 1) {
ops[opsa[i]] = true;
}
for (i = 0; i < opsmatcha.length; i += 1) {
opsmatch[opsmatcha[i]] = true;
}
return function (ch, matchattr) {
if (matchattr) {
return ch in opsmatch;
}
return ch in ops;
};
}());
// creates token objects and pushes them to a list
function tokener(value, type) {
session.tokens.push({
value: value,
type: type || value,
start: null,
end: null
});
}
function getPosInfo(w) {
var errPos = w.chnum;
var source = w.source.replace(/\r\n?/g, '\n');
var part = w.source.substring(0, errPos + 1).replace(/\r\n?/g, '\n');
var lines = part.split('\n');
var ch = (lines[lines.length - 1] || '').length;
var fullLine = source.split('\n')[lines.length - 1] || '';
var chunkSize = 100;
var offset = Math.max(0, ch - chunkSize);
var formattedLine = fullLine.substr(offset, chunkSize * 2) + '\n';
for (var i = 0; i < ch - offset - 1; i++) {
formattedLine += '-';
}
formattedLine += '^';
return {
line: lines.length,
ch: ch,
text: fullLine,
hint: formattedLine
};
}
function raiseError(message) {
var err = error(message);
var errObj = new Error(err.message, '', err.line);
errObj.line = err.line;
errObj.ch = err.ch;
errObj.name = err.name;
errObj.hint = err.hint;
throw errObj;
}
// oops
function error(m) {
var w = walker;
var info = getPosInfo(walker);
var tokens = session.tokens;
session.tokens = null;
var message = 'CSS parsing error at line ' + info.line + ', char ' + info.ch + ': ' + m;
message += '\n' + info.hint;
return {
name: "ParseError",
message: message,
hint: info.hint,
line: info.line,
ch: info.ch
};
}
// token handlers follow for:
// white space, comment, string, identifier, number, operator
function white() {
var c = walker.ch,
token = '';
while (c === " " || c === "\t") {
token += c;
c = walker.nextChar();
}
tokener(token, 'white');
}
function comment() {
var w = walker,
c = w.ch,
token = c,
cnext;
cnext = w.nextChar();
if (cnext === '/') {
// inline comment in SCSS and LESS
while (c && !(cnext === "\n" || cnext === "\r")) {
token += cnext;
c = cnext;
cnext = w.nextChar();
}
} else if (cnext === '*') {
// multiline CSS commment
while (c && !(c === "*" && cnext === "/")) {
token += cnext;
c = cnext;
cnext = w.nextChar();
}
} else {
// oops, not a comment, just a /
return tokener(token, token);
}
token += cnext;
w.nextChar();
tokener(token, 'comment');
}
function eatString() {
var w = walker,
c = w.ch,
q = c,
token = c,
cnext;
c = w.nextChar();
while (c !== q) {
if (c === '\n') {
cnext = w.nextChar();
if (cnext === "\\") {
token += c + cnext;
} else {
// end of line with no \ escape = bad
raiseError("Unterminated string");
}
} else if (c === '') {
raiseError("Unterminated string");
} else {
if (c === "\\") {
token += c + w.nextChar();
} else {
token += c;
}
}
c = w.nextChar();
}
token += c;
return token;
}
function str() {
var token = eatString();
walker.nextChar();
tokener(token, 'string');
}
function brace() {
var w = walker,
c = w.ch,
depth = 1,
token = c,
stop = false;
c = w.nextChar();
while (c && !stop) {
if (c === '(') {
depth++;
} else if (c === ')') {
depth--;
if (!depth) {
stop = true;
}
} else if (c === '"' || c === "'") {
c = eatString();
} else if (c === '') {
raiseError("Unterminated brace");
}
token += c;
c = w.nextChar();
}
tokener(token, 'brace');
}
function identifier(pre) {
var c = walker.ch;
var token = pre ? pre + c : c;
c = walker.nextChar();
var cc = c.charCodeAt(0);
while (isNameChar(c, cc) || isDigit(c, cc)) {
token += c;
c = walker.nextChar();
cc = c.charCodeAt(0);
}
tokener(token, 'identifier');
}
function num() {
var w = walker,
c = w.ch,
token = c,
point = token === '.',
nondigit;
c = w.nextChar();
nondigit = !isDigit(c);
// .2px or .classname?
if (point && nondigit) {
// meh, NaN, could be a class name, so it's an operator for now
return tokener(token, '.');
}
// -2px or -moz-something
if (token === '-' && nondigit) {
return identifier('-');
}
while (c !== '' && (isDigit(c) || (!point && c === '.'))) { // not end of source && digit or first instance of .
if (c === '.') {
point = true;
}
token += c;
c = w.nextChar();
}
tokener(token, 'number');
}
function op() {
var w = walker,
c = w.ch,
token = c,
next = w.nextChar();
if (next === "=" && isOp(token, true)) {
token += next;
tokener(token, 'match');
w.nextChar();
return;
}
tokener(token, token);
}
// call the appropriate handler based on the first character in a token suspect
function tokenize() {
var ch = walker.ch;
if (ch === " " || ch === "\t") {
return white();
}
if (ch === '/') {
return comment();
}
if (ch === '"' || ch === "'") {
return str();
}
if (ch === '(') {
return brace();
}
if (ch === '-' || ch === '.' || isDigit(ch)) { // tricky - char: minus (-1px) or dash (-moz-stuff)
return num();
}
if (isNameChar(ch)) {
return identifier();
}
if (isOp(ch)) {
return op();
}
if (ch === '\r') {
if (walker.peek() === '\n') {
ch += walker.nextChar();
}
tokener(ch, 'line');
walker.nextChar();
return;
}
if (ch === '\n') {
tokener(ch, 'line');
walker.nextChar();
return;
}
raiseError("Unrecognized character '" + ch + "'");
}
return {
/**
* Sprits given source into tokens
* @param {String} source
* @returns {Array}
*/
lex: function (source) {
walker.init(source);
session.tokens = [];
// for empty source, return single space token
if (!source) {
session.tokens.push(this.white());
} else {
while (walker.ch !== '') {
tokenize();
}
}
var tokens = session.tokens;
session.tokens = null;
return tokens;
},
/**
* Tokenizes CSS source. It's like `lex()` method,
* but also stores proper token indexes in source,
* so it's a bit slower
* @param {String} source
* @returns {Array}
*/
parse: function(source) {
// transform tokens
var tokens = this.lex(source), pos = 0, token;
for (var i = 0, il = tokens.length; i < il; i++) {
token = tokens[i];
token.start = pos;
token.end = (pos += token.value.length);
}
return tokens;
},
white: function() {
return {
value: '',
type: 'white',
start: 0,
end: 0
};
},
toSource: function(toks) {
var i = 0, max = toks.length, src = '';
for (; i < max; i++) {
src += toks[i].value;
}
return src;
}
};
});