@gmod/jbrowse/src/JBrowse/ConfigAdaptor/conf.js

JBrowse - client-side genome browser

/**
 * Configuration adaptor for JBrowse's text configuration format.
 * That is, the text configuration format that is not JSON.
 */
define([
           'dojo/_base/declare',
           'dojo/_base/lang',
           'dojo/_base/array',
           'dojo/json',

           'JBrowse/ConfigAdaptor/JB_json_v1'
       ],
       function(
           declare,
           lang,
           array,
           JSON,

           JB_json
       ) {
return declare( [JB_json], {

_isAlwaysArray: function(varname) {
    return { include: true }[varname];
},

parse_conf: function( text, load_args ) {
    var section = [], keypath, operation, value;
    var data = {};
    var lineNumber;

    function recordVal() {
        if( value !== undefined ) {
            try {
                var match;
                // parse json
                if(( match = value.match(/^json:(.+)/i) )) {
                    value = JSON.parse( match[1] );
                }
                // parse numbers if it looks numeric
                else if( /^[\+\-]?[\d\.,]+([eE][\-\+]?\d+)?$/.test(value) )
                    value = parseFloat( value.replace(/,/g,'') );

                var path = section.concat(keypath).join('.');
                if( operation == '+=' ) {
                    var existing = lang.getObject( path, false, data );
                    if( existing ) {
                        if( ! lang.isArray( existing ) )
                            existing = [existing];
                    }
                    else {
                        existing = [];
                    }
                    existing.push( value );
                    value = existing;
                }
                if(value=="true") value=true;
                if(value=="false") value=false;
                lang.setObject( path, value, data );
            } catch(e) {
                throw new Error( "syntax error"
                                 + ( (load_args.config||{}).url ? ' in '+load_args.config.url : '' )
                                 + ( lineNumber? " at line "+(lineNumber-1) : '' )
                               );
            }
        }
    }

    array.forEach( text.split("\n"), function( line, i ) {
        lineNumber = i+1;
        line = line.replace(/^\s*#.+/,'');
        var match;

        // new section
        if(( match = line.match( /^\s*\[([^\]]+)/ ))) { // new section
            recordVal();
            keypath = value = undefined;
            section = match[1].trim().split(/\s*\.\s*/);
            if( section.length == 1 && section[0].toLowerCase() == 'general' )
                section = [];
        }
        // new value
        else if(( match = line.match( value == undefined ? /^([^\+=]+)(\+?=)(.*)/ : /^(\S[^\+=]+)(\+?=)(.*)/ ))) {
            recordVal();
            keypath = match[1].trim().split(/\s*\.\s*/);
            operation = match[2];
            if( this._isAlwaysArray( section.concat(keypath).join('.') ) ) {
                operation = '+=';
            }
            value = match[3].trim();
        }
        // add to existing array value
        else if( keypath !== undefined && ( match = line.match( /^\s{0,4}\+\s*(.+)/ ) ) ) {
            recordVal();
            operation = '+=';
            value = match[1].trim();
        }
        // add to existing value
        else if( value !== undefined && (match = line.match( /^\s+(\S.*)/ ))) {
            value += value.length ? ' '+match[1].trim() : match[1].trim();
        }
        // done with last value
        else {
            recordVal();
            keypath = value = undefined;
        }
    },this);

    recordVal();

    return data;
}

});
});