basecamp-guide/lib/FileContent.js

Task automator for the Basecamp Framework.

// Dependecies


var FileContent = (function() {
    // private vars
    var fileContent;

    // private methods
    var contentExist = function(contentToAdd) {
        
        var position = fileContent.search(makeRegExFrom(contentToAdd));
        if (position >= 0) return true;
        
        return false;
    };

    var makeRegExFrom = function(value) {
        return new RegExp(value.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&"));
    };

    var writeContentAtPosition = function(position, content) {
        var part1 = fileContent.slice(0, position);
        var part2 = fileContent.slice(position);
        
        return part1 + content + part2;
    };

    var searchNextPositionOf = function(searchRegExp, startPosition) {
        
        var contentToBeSearched = fileContent.slice(startPosition);
        return contentToBeSearched.search(searchRegExp) + startPosition;
    };


    return {
        // public methods
        init : function(initFileContent) {
            fileContent = initFileContent;
            return this;
        },
        get : function() {
            return fileContent;
        },
        add : function(content, position) {
            if (position === undefined ) position = fileContent.length;
            if (contentExist(content)) return 'CONTENT_EXIST';

            fileContent = writeContentAtPosition(position, content);

            return 'CONTENT_ADDED';
        },
        addAfter : function(afterText, content) {
            
            if (! contentExist(afterText)) return 'AFTER_TEXT_NOT_EXIST';
            if (contentExist(content)) return 'CONTENT_EXIST';

            var addPosition = fileContent.search(makeRegExFrom(afterText)) + afterText.length;
            fileContent = writeContentAtPosition(addPosition, content);

            return 'CONTENT_ADDED';
        },
        addBetween : function(startText, endText, content) {
            if (! contentExist(startText)) return 'START_TEXT_NOT_EXIST';
            if (! contentExist(endText)) return 'END_TEXT_NOT_EXIST';
            if (contentExist(content)) return 'CONTENT_EXIST';

            var startPosition = fileContent.search(makeRegExFrom(startText)) + startText.length;
            var endPosition = searchNextPositionOf(makeRegExFrom(endText), startPosition);
            fileContent = writeContentAtPosition(endPosition, content);

            return 'CONTENT_ADDED';
        },
        replace: function(oldContent, content) {
            if (! contentExist(oldContent)) return 'CONTENT_TO_REPLACE_NOT_EXIST';
            
            fileContent = fileContent.replace(makeRegExFrom(oldContent), content);
            return 'CONTENT_REPLACED';
        }
    };

})();

module.exports = FileContent;