blob: eaa865b274397e7a62eed160fb7bdf646468c8d7 [file] [log] [blame] [raw]
// Copyright (c) 2012-2017, Matt Godbolt
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
var fs = require('fs'),
logger = require('./logger').logger;
var properties = {};
var hierarchy = [];
var propDebug = false;
function findProps(base, elem) {
var name = base + '.' + elem;
return properties[name];
}
function debug(string) {
if (propDebug) logger.info("prop: " + string);
}
function get(base, property, defaultValue) {
var result = defaultValue;
var source = 'default';
hierarchy.forEach(function (elem) {
var propertyMap = findProps(base, elem);
if (propertyMap && property in propertyMap) {
debug(base + '.' + property + ': overriding ' + source + ' value (' + result + ') with ' + propertyMap[property]);
result = propertyMap[property];
source = elem;
}
});
debug(base + '.' + property + ': returning ' + result + ' (from ' + source + ')');
return result;
}
function toProperty(prop) {
if (prop == 'true' || prop == 'yes') return true;
if (prop == 'false' || prop == 'no') return false;
if (prop.match(/^[0-9]+$/)) return parseInt(prop);
if (prop.match(/^[0-9]*\.[0-9]+$/)) return parseFloat(prop);
return prop;
}
function parseProperties(blob, name) {
var props = {};
blob.split('\n').forEach(function (line, index) {
line = line.replace(/#.*/, '').trim();
if (!line) return;
var split = line.match(/([^=]+)=(.*)/);
if (!split) {
logger.error("Bad line: " + line + " in " + name + ":" + (index + 1));
return;
}
props[split[1].trim()] = toProperty(split[2].trim());
debug(split[1].trim() + " = " + split[2].trim());
});
return props;
}
function initialize(directory, hier) {
if (hier === null) throw new Error('Must supply a hierarchy array');
logger.info("Reading properties from " + directory + " with hierarchy " + hier);
hierarchy = hier;
var endsWith = /\.properties$/;
var propertyFiles = fs.readdirSync(directory).filter(function (filename) {
return filename.match(endsWith);
});
properties = {};
propertyFiles.forEach(function (file) {
var baseName = file.replace(endsWith, '');
file = directory + '/' + file;
debug('Reading config from ' + file);
properties[baseName] = parseProperties(fs.readFileSync(file, 'utf-8'), file);
});
logger.debug("props.properties = ", properties);
}
function propsFor(base) {
return function(property, defaultValue) {
return get(base, property, defaultValue);
};
}
module.exports = {
get: get,
propsFor: propsFor,
initialize: initialize,
setDebug: function(debug) { propDebug = debug; }
};