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/**
* @fileoverview Rule to check for max length on a line.
* @author Matt DuVall <http://www.mattduvall.com>
* @copyright 2013 Matt DuVall. All rights reserved.
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
/**
* Creates a string that is made up of repeating a given string a certain
* number of times. This uses exponentiation of squares to achieve significant
* performance gains over the more traditional implementation of such
* functionality.
* @param {string} str The string to repeat.
* @param {int} num The number of times to repeat the string.
* @returns {string} The created string.
* @private
*/
function stringRepeat(str, num) {
var result = "";
for (num |= 0; num > 0; num >>>= 1, str += str) {
if (num & 1) {
result += str;
}
}
return result;
}
var tabWidth = context.options[1];
var maxLength = context.options[0],
tabString = stringRepeat(" ", tabWidth);
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
function checkProgramForMaxLength(node) {
var lines = context.getSourceLines();
// Replace the tabs
// Split (honors line-ending)
// Iterate
lines.forEach(function(line, i) {
if (line.replace(/\t/g, tabString).length > maxLength) {
context.report(node, { line: i + 1, col: 1 }, "Line " + (i + 1) + " exceeds the maximum line length of " + maxLength + ".");
}
});
}
//--------------------------------------------------------------------------
// Public API
//--------------------------------------------------------------------------
return {
"Program": checkProgramForMaxLength
};
};
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