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index.js
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index.js
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var _ = require('lodash');
var EventEmitter = require('drip').EnhancedEmitter;
var sub = require('string-sub');
var re = function(rules) {
EventEmitter.call(this);
var rulesets = {};
_.assign(rulesets, rules);
this.rules = rulesets;
};
re.prototype = _.create(
EventEmitter.prototype,
{
constructor: re,
getValue: _.get,
getMessage: function(result, rule, context) {
var warning;
var message = rule.message || this.message;
if (rule.message === false) {
message = false;
}
if (_.isString(message)) {
warning = this.message(message, result, rule, context);
}
else if (_.isFunction(message)) {
warning = message.call(this, result, rule, context);
}
return warning;
},
isValidRule: function(ruleName, rule, context) {
return (ruleName !== 'IGNORE' && ruleName.indexOf('_') !== 0) &&
(!rule.valid || (_.isFunction(rule.valid) && rule.valid.call(this, rule, context)));
},
isValidRuleSet: function(rules, context) {
var validRuleSet = false;
if (_.isObject(rules)) {
var ignore = rules.IGNORE;
var customIgnore = context.customIgnore;
var rawContent = context.rawContent;
validRuleSet = (!ignore || (ignore && !ignore.test(rawContent))) &&
(!customIgnore || (customIgnore && !customIgnore.test(rawContent)));
}
return validRuleSet;
},
iterateRules: function(rules, context) {
var instance = this;
if (_.isString(rules)) {
rules = instance.getValue(instance.rules, rules);
}
var contentProp = this._getContentProp(context);
var rawContent = context[contentProp];
if (instance.isValidRuleSet(rules, context)) {
_.forEach(
rules,
function(rule, ruleName) {
if (instance.isValidRule(ruleName, rule, context)) {
var result = instance.testContent(rule, context, rules);
if (result) {
var message = instance.getMessage(result, rule, context);
if (message) {
instance.emit(
'message',
{
context: context,
message: message
}
);
}
rawContent = instance.replaceItem(result, rule, context);
}
}
}
);
}
return rawContent;
},
match: function(content, re) {
return content.match(re);
},
message: function(message, result, rule, context) {
return sub(message, context.lineNum, context.content);
},
replaceItem: function(result, rule, context) {
var replacer = rule.replacer;
var contentProp = this._getContentProp(context);
var rawContent = context[contentProp];
if (replacer) {
rawContent = this._callReplacer(result, rule, context);
context[contentProp] = rawContent;
}
return rawContent;
},
test: function(content, regex) {
return regex.test(content);
},
testContent: function(rule, context, rules) {
var regex = rule.regex;
var test = rule.test || this.test;
if (test === 'match') {
test = this.match;
}
var testProp = _.get(
_.find(
[rule, rules, this],
function(item, index) {
var testProp = item && item.testProp;
return testProp && context.hasOwnProperty(testProp);
}
),
'testProp',
'content'
);
var testItem = context[testProp];
return test.call(this, testItem, regex, rule, context);
},
_callReplacer: function(result, rule, context) {
var contentProp = this._getContentProp(context);
var rawContent = context[contentProp];
var replacer = rule.replacer;
if (_.isString(replacer)) {
rawContent = rawContent.replace(rule.regex, replacer);
}
else if (_.isFunction(replacer)) {
rawContent = replacer.call(this, result, rule, context);
}
return rawContent;
},
// TODO: Need to analyze this in regards to the testProp feature.
// Specifying the testProp will test some other property, but the
// content that's returned will either be from content or rawContent.
_getContentProp: function(context) {
return _.isUndefined(context.rawContent) ? 'content' : 'rawContent';
}
}
);
module.exports = re;