# Yahoo! UI Library

### dataschema 3.0.0

Yahoo! UI Library > dataschema > dataschema-text.js (source view)
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    /**
     * Provides a DataSchema implementation which can be used to work with delimited text data.
     *
     * @module dataschema
     * @submodule dataschema-text
     */

    /**
     * Text subclass for the DataSchema Utility.
     * @class DataSchema.Text
     * @extends DataSchema.Base
     * @static
     */

    var LANG = Y.Lang,

        SchemaText = {

            /////////////////////////////////////////////////////////////////////////////
            //
            // DataSchema.Text static methods
            //
            /////////////////////////////////////////////////////////////////////////////
            /**
             * Applies a given schema to given delimited text data.
             *
             * @method apply
             * @param schema {Object} Schema to apply.
             * @param data {Object} Text data.
             * @return {Object} Schema-parsed data.
             * @static
             */
            apply: function(schema, data) {
                var data_in = data,
                    data_out = {results:[],meta:{}};

                if(LANG.isString(data_in) && LANG.isString(schema.resultDelimiter)) {
                    // Parse results data
                    data_out = SchemaText._parseResults(schema, data_in, data_out);
                }
                else {
                    Y.log("Text data could not be schema-parsed: " + Y.dump(data) + " " + Y.dump(data), "error", "dataschema-text");
                    data_out.error = new Error("Text schema parse failure");
                }

                return data_out;
            },

            /**
             * Schema-parsed list of results from full data
             *
             * @method _parseResults
             * @param schema {Array} Schema to parse against.
             * @param text_in {String} Text to parse.
             * @param data_out {Object} In-progress parsed data to update.
             * @return {Object} Parsed data object.
             * @static
             * @protected
             */
            _parseResults: function(schema, text_in, data_out) {
                var resultDelim = schema.resultDelimiter,
                    results = [],
                    results_in, fields_in, result, item, fields, field, key, value, i, j,

                // Delete final delimiter at end of string if there
                tmpLength = text_in.length-resultDelim.length;
                if(text_in.substr(tmpLength) == resultDelim) {
                    text_in = text_in.substr(0, tmpLength);
                }

                // Split into results
                results_in = text_in.split(schema.resultDelimiter);

                for(i=results_in.length-1; i>-1; i--) {
                    result = {};
                    item = results_in[i];

                    if(LANG.isString(schema.fieldDelimiter)) {
                        fields_in = item.split(schema.fieldDelimiter);

                        if(LANG.isArray(schema.resultFields)) {
                            fields = schema.resultFields;
                            for(j=fields.length-1; j>-1; j--) {
                                field = fields[j];
                                key = (!LANG.isUndefined(field.key)) ? field.key : field;
                                value = (!LANG.isUndefined(fields_in[key])) ? fields_in[key] : fields_in[j];
                                result[key] = Y.DataSchema.Base.parse(value, field);
                            }
                        }

                    }
                    else {
                        result = item;
                    }

                    results[i] = result;
                }
                data_out.results = results;

                return data_out;
            }
        };

    Y.DataSchema.Text = Y.mix(SchemaText, Y.DataSchema.Base);

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