no-multi-spaces.js
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/**
* @fileoverview Disallow use of multiple spaces.
* @author Nicholas C. Zakas
* @copyright 2015 Brandon Mills. All rights reserved.
* @copyright 2015 Nicholas C. Zakas. All rights reserved.
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
// the index of the last comment that was checked
var exceptions = { "Property": true },
hasExceptions = true,
options = context.options[0],
lastCommentIndex = 0;
if (options && options.exceptions) {
Object.keys(options.exceptions).forEach(function(key) {
if (options.exceptions[key]) {
exceptions[key] = true;
} else {
delete exceptions[key];
}
});
hasExceptions = Object.keys(exceptions).length > 0;
}
/**
* Determines if a given source index is in a comment or not by checking
* the index against the comment range. Since the check goes straight
* through the file, once an index is passed a certain comment, we can
* go to the next comment to check that.
* @param {int} index The source index to check.
* @param {ASTNode[]} comments An array of comment nodes.
* @returns {boolean} True if the index is within a comment, false if not.
* @private
*/
function isIndexInComment(index, comments) {
var comment;
while (lastCommentIndex < comments.length) {
comment = comments[lastCommentIndex];
if (comment.range[0] <= index && index < comment.range[1]) {
return true;
} else if (index > comment.range[1]) {
lastCommentIndex++;
} else {
break;
}
}
return false;
}
//--------------------------------------------------------------------------
// Public
//--------------------------------------------------------------------------
return {
"Program": function() {
var source = context.getSource(),
allComments = context.getAllComments(),
pattern = /[^\n\r\u2028\u2029 ] {2,}/g, // note: repeating space
token,
previousToken,
parent;
/**
* Creates a fix function that removes the multiple spaces between the two tokens
* @param {RuleFixer} leftToken left token
* @param {RuleFixer} rightToken right token
* @returns {function} fix function
* @private
*/
function createFix(leftToken, rightToken) {
return function(fixer) {
return fixer.replaceTextRange([leftToken.range[1], rightToken.range[0]], " ");
};
}
while (pattern.test(source)) {
// do not flag anything inside of comments
if (!isIndexInComment(pattern.lastIndex, allComments)) {
token = context.getTokenByRangeStart(pattern.lastIndex);
if (token) {
previousToken = context.getTokenBefore(token);
if (hasExceptions) {
parent = context.getNodeByRangeIndex(pattern.lastIndex - 1);
}
if (!parent || !exceptions[parent.type]) {
context.report({
node: token,
loc: token.loc.start,
message: "Multiple spaces found before '{{value}}'.",
data: { value: token.value },
fix: createFix(previousToken, token)
});
}
}
}
}
}
};
};
module.exports.schema = [
{
"type": "object",
"properties": {
"exceptions": {
"type": "object",
"patternProperties": {
"^([A-Z][a-z]*)+$": {
"type": "boolean"
}
},
"additionalProperties": false
}
},
"additionalProperties": false
}
];