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chat-nface
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'use strict';

const types = require('../../../tokenizer/types.cjs');

const structure = {
    name: String,
    value: ['Identifier', 'Number', 'Dimension', 'Ratio', null]
};

function createParse(type) {
    return function parse() {
        const start = this.tokenStart;
        let name;
        let value = null;

        this.eat(types.LeftParenthesis);
        this.skipSC();

        name = this.consume(types.Ident);
        this.skipSC();

        if (this.tokenType !== types.RightParenthesis) {
            this.eat(types.Colon);
            this.skipSC();

            switch (this.tokenType) {
                case types.Number:
                    if (this.lookupNonWSType(1) === types.Delim) {
                        value = this.Ratio();
                    } else {
                        value = this.Number();
                    }

                    break;

                case types.Dimension:
                    value = this.Dimension();
                    break;

                case types.Ident:
                    value = this.Identifier();
                    break;

                default:
                    this.error('Number, dimension, ratio or identifier is expected');
            }

            this.skipSC();
        }

        this.eat(types.RightParenthesis);

        return {
            type,
            loc: this.getLocation(start, this.tokenStart),
            name,
            value
        };
    };
}

function generate(node) {
    this.token(types.LeftParenthesis, '(');
    this.token(types.Ident, node.name);

    if (node.value !== null) {
        this.token(types.Colon, ':');
        this.node(node.value);
    }

    this.token(types.RightParenthesis, ')');
}

exports.createParse = createParse;
exports.generate = generate;
exports.structure = structure;