postcss-less/lib/tokenizer/tokenize-at-rule.js

LESS parser for PostCSS

import {atEndPattern, openedCurlyBracket, variablePattern, wordEndPattern} from './globals';
import unclosed from './unclosed';

export default function tokenizeAtRule (state) {
    // it's an interpolation
    if (state.css.charCodeAt(state.pos + 1) === openedCurlyBracket) {
        state.nextPos = state.css.indexOf('}', state.pos + 2);

        if (state.nextPos === -1) {
            unclosed(state, 'interpolation');
        }

        state.cssPart = state.css.slice(state.pos, state.nextPos + 1);
        state.lines = state.cssPart.split('\n');
        state.lastLine = state.lines.length - 1;

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

        state.tokens.push([
            'word', state.cssPart,
            state.line, state.pos - state.offset,
            state.nextLine, state.nextPos - state.nextOffset
        ]);

        state.offset = state.nextOffset;
        state.line = state.nextLine;
    } else {
        atEndPattern.lastIndex = state.pos + 1;
        atEndPattern.test(state.css);

        if (atEndPattern.lastIndex === 0) {
            state.nextPos = state.css.length - 1;
        } else {
            state.nextPos = atEndPattern.lastIndex - 2;
        }

        state.cssPart = state.css.slice(state.pos, state.nextPos + 1);
        state.token = 'at-word';

        // check if it's a variable
        if (variablePattern.test(state.cssPart)) {
            wordEndPattern.lastIndex = state.pos + 1;
            wordEndPattern.test(state.css);
            if (wordEndPattern.lastIndex === 0) {
                state.nextPos = state.css.length - 1;
            } else {
                state.nextPos = wordEndPattern.lastIndex - 2;
            }

            state.cssPart = state.css.slice(state.pos, state.nextPos + 1);
            state.token = 'word';
        }

        state.tokens.push([
            state.token, state.cssPart,
            state.line, state.pos - state.offset,
            state.line, state.nextPos - state.offset
        ]);
    }

    state.pos = state.nextPos;
}