'use strict';

exports.__esModule = true;
exports.default = tokenizer;
var SINGLE_QUOTE = 39;
var DOUBLE_QUOTE = 34;
var BACKSLASH = 92;
var SLASH = 47;
var NEWLINE = 10;
var SPACE = 32;
var FEED = 12;
var TAB = 9;
var CR = 13;
var OPEN_SQUARE = 91;
var CLOSE_SQUARE = 93;
var OPEN_PARENTHESES = 40;
var CLOSE_PARENTHESES = 41;
var OPEN_CURLY = 123;
var CLOSE_CURLY = 125;
var SEMICOLON = 59;
var ASTERISK = 42;
var COLON = 58;
var AT = 64;

var RE_AT_END = /[ \n\t\r\f\{\(\)'"\\;/\[\]#]/g;
var RE_WORD_END = /[ \n\t\r\f\(\)\{\}:;@!'"\\\]\[#]|\/(?=\*)/g;
var RE_BAD_BRACKET = /.[\\\/\("'\n]/;
var RE_HEX_ESCAPE = /[a-f0-9]/i;

function tokenizer(input) {
    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};

    var css = input.css.valueOf();
    var ignore = options.ignoreErrors;

    var code = void 0,
        next = void 0,
        quote = void 0,
        lines = void 0,
        last = void 0,
        content = void 0,
        escape = void 0,
        nextLine = void 0,
        nextOffset = void 0,
        escaped = void 0,
        escapePos = void 0,
        prev = void 0,
        n = void 0,
        currentToken = void 0;

    var length = css.length;
    var offset = -1;
    var line = 1;
    var pos = 0;
    var buffer = [];
    var returned = [];

    function unclosed(what) {
        throw input.error('Unclosed ' + what, line, pos - offset);
    }

    function endOfFile() {
        return returned.length === 0 && pos >= length;
    }

    function nextToken() {
        if (returned.length) return returned.pop();
        if (pos >= length) return;

        code = css.charCodeAt(pos);
        if (code === NEWLINE || code === FEED || code === CR && css.charCodeAt(pos + 1) !== NEWLINE) {
            offset = pos;
            line += 1;
        }

        switch (code) {
            case NEWLINE:
            case SPACE:
            case TAB:
            case CR:
            case FEED:
                next = pos;
                do {
                    next += 1;
                    code = css.charCodeAt(next);
                    if (code === NEWLINE) {
                        offset = next;
                        line += 1;
                    }
                } while (code === SPACE || code === NEWLINE || code === TAB || code === CR || code === FEED);

                currentToken = ['space', css.slice(pos, next)];
                pos = next - 1;
                break;

            case OPEN_SQUARE:
                currentToken = ['[', '[', line, pos - offset];
                break;

            case CLOSE_SQUARE:
                currentToken = [']', ']', line, pos - offset];
                break;

            case OPEN_CURLY:
                currentToken = ['{', '{', line, pos - offset];
                break;

            case CLOSE_CURLY:
                currentToken = ['}', '}', line, pos - offset];
                break;

            case COLON:
                currentToken = [':', ':', line, pos - offset];
                break;

            case SEMICOLON:
                currentToken = [';', ';', line, pos - offset];
                break;

            case OPEN_PARENTHESES:
                prev = buffer.length ? buffer.pop()[1] : '';
                n = css.charCodeAt(pos + 1);
                if (prev === 'url' && n !== SINGLE_QUOTE && n !== DOUBLE_QUOTE && n !== SPACE && n !== NEWLINE && n !== TAB && n !== FEED && n !== CR) {
                    next = pos;
                    do {
                        escaped = false;
                        next = css.indexOf(')', next + 1);
                        if (next === -1) {
                            if (ignore) {
                                next = pos;
                                break;
                            } else {
                                unclosed('bracket');
                            }
                        }
                        escapePos = next;
                        while (css.charCodeAt(escapePos - 1) === BACKSLASH) {
                            escapePos -= 1;
                            escaped = !escaped;
                        }
                    } while (escaped);

                    currentToken = ['brackets', css.slice(pos, next + 1), line, pos - offset, line, next - offset];

                    pos = next;
                } else {
                    next = css.indexOf(')', pos + 1);
                    content = css.slice(pos, next + 1);

                    if (next === -1 || RE_BAD_BRACKET.test(content)) {
                        currentToken = ['(', '(', line, pos - offset];
                    } else {
                        currentToken = ['brackets', content, line, pos - offset, line, next - offset];
                        pos = next;
                    }
                }

                break;

            case CLOSE_PARENTHESES:
                currentToken = [')', ')', line, pos - offset];
                break;

            case SINGLE_QUOTE:
            case DOUBLE_QUOTE:
                quote = code === SINGLE_QUOTE ? '\'' : '"';
                next = pos;
                do {
                    escaped = false;
                    next = css.indexOf(quote, next + 1);
                    if (next === -1) {
                        if (ignore) {
                            next = pos + 1;
                            break;
                        } else {
                            unclosed('string');
                        }
                    }
                    escapePos = next;
                    while (css.charCodeAt(escapePos - 1) === BACKSLASH) {
                        escapePos -= 1;
                        escaped = !escaped;
                    }
                } while (escaped);

                content = css.slice(pos, next + 1);
                lines = content.split('\n');
                last = lines.length - 1;

                if (last > 0) {
                    nextLine = line + last;
                    nextOffset = next - lines[last].length;
                } else {
                    nextLine = line;
                    nextOffset = offset;
                }

                currentToken = ['string', css.slice(pos, next + 1), line, pos - offset, nextLine, next - nextOffset];

                offset = nextOffset;
                line = nextLine;
                pos = next;
                break;

            case AT:
                RE_AT_END.lastIndex = pos + 1;
                RE_AT_END.test(css);
                if (RE_AT_END.lastIndex === 0) {
                    next = css.length - 1;
                } else {
                    next = RE_AT_END.lastIndex - 2;
                }

                currentToken = ['at-word', css.slice(pos, next + 1), line, pos - offset, line, next - offset];

                pos = next;
                break;

            case BACKSLASH:
                next = pos;
                escape = true;
                while (css.charCodeAt(next + 1) === BACKSLASH) {
                    next += 1;
                    escape = !escape;
                }
                code = css.charCodeAt(next + 1);
                if (escape && code !== SLASH && code !== SPACE && code !== NEWLINE && code !== TAB && code !== CR && code !== FEED) {
                    next += 1;
                    if (RE_HEX_ESCAPE.test(css.charAt(next))) {
                        while (RE_HEX_ESCAPE.test(css.charAt(next + 1))) {
                            next += 1;
                        }
                        if (css.charCodeAt(next + 1) === SPACE) {
                            next += 1;
                        }
                    }
                }

                currentToken = ['word', css.slice(pos, next + 1), line, pos - offset, line, next - offset];

                pos = next;
                break;

            default:
                if (code === SLASH && css.charCodeAt(pos + 1) === ASTERISK) {
                    next = css.indexOf('*/', pos + 2) + 1;
                    if (next === 0) {
                        if (ignore) {
                            next = css.length;
                        } else {
                            unclosed('comment');
                        }
                    }

                    content = css.slice(pos, next + 1);
                    lines = content.split('\n');
                    last = lines.length - 1;

                    if (last > 0) {
                        nextLine = line + last;
                        nextOffset = next - lines[last].length;
                    } else {
                        nextLine = line;
                        nextOffset = offset;
                    }

                    currentToken = ['comment', content, line, pos - offset, nextLine, next - nextOffset];

                    offset = nextOffset;
                    line = nextLine;
                    pos = next;
                } else {
                    RE_WORD_END.lastIndex = pos + 1;
                    RE_WORD_END.test(css);
                    if (RE_WORD_END.lastIndex === 0) {
                        next = css.length - 1;
                    } else {
                        next = RE_WORD_END.lastIndex - 2;
                    }

                    currentToken = ['word', css.slice(pos, next + 1), line, pos - offset, line, next - offset];

                    buffer.push(currentToken);

                    pos = next;
                }

                break;
        }

        pos++;
        return currentToken;
    }

    function back(token) {
        returned.push(token);
    }

    return {
        back: back,
        nextToken: nextToken,
        endOfFile: endOfFile
    };
}
module.exports = exports['default'];
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