comma-spacing.js
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/**
* @fileoverview Comma spacing - validates spacing before and after comma
* @author Vignesh Anand aka vegetableman.
* @copyright 2014 Vignesh Anand. All rights reserved.
*/
"use strict";
var astUtils = require("../ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
var sourceCode = context.getSourceCode();
var tokensAndComments = sourceCode.tokensAndComments;
var options = {
before: context.options[0] ? !!context.options[0].before : false,
after: context.options[0] ? !!context.options[0].after : true
};
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
// list of comma tokens to ignore for the check of leading whitespace
var commaTokensToIgnore = [];
/**
* Determines if a given token is a comma operator.
* @param {ASTNode} token The token to check.
* @returns {boolean} True if the token is a comma, false if not.
* @private
*/
function isComma(token) {
return !!token && (token.type === "Punctuator") && (token.value === ",");
}
/**
* Reports a spacing error with an appropriate message.
* @param {ASTNode} node The binary expression node to report.
* @param {string} dir Is the error "before" or "after" the comma?
* @param {ASTNode} otherNode The node at the left or right of `node`
* @returns {void}
* @private
*/
function report(node, dir, otherNode) {
context.report({
node: node,
fix: function(fixer) {
if (options[dir]) {
if (dir === "before") {
return fixer.insertTextBefore(node, " ");
} else {
return fixer.insertTextAfter(node, " ");
}
} else {
var start, end;
var newText = "";
if (dir === "before") {
start = otherNode.range[1];
end = node.range[0];
} else {
start = node.range[1];
end = otherNode.range[0];
}
return fixer.replaceTextRange([start, end], newText);
}
},
message: options[dir] ?
"A space is required " + dir + " ','." :
"There should be no space " + dir + " ','."
});
}
/**
* Validates the spacing around a comma token.
* @param {Object} tokens - The tokens to be validated.
* @param {Token} tokens.comma The token representing the comma.
* @param {Token} [tokens.left] The last token before the comma.
* @param {Token} [tokens.right] The first token after the comma.
* @param {Token|ASTNode} reportItem The item to use when reporting an error.
* @returns {void}
* @private
*/
function validateCommaItemSpacing(tokens, reportItem) {
if (tokens.left && astUtils.isTokenOnSameLine(tokens.left, tokens.comma) &&
(options.before !== sourceCode.isSpaceBetweenTokens(tokens.left, tokens.comma))
) {
report(reportItem, "before", tokens.left);
}
if (tokens.right && !options.after && tokens.right.type === "Line") {
return false;
}
if (tokens.right && astUtils.isTokenOnSameLine(tokens.comma, tokens.right) &&
(options.after !== sourceCode.isSpaceBetweenTokens(tokens.comma, tokens.right))
) {
report(reportItem, "after", tokens.right);
}
}
/**
* Adds null elements of the given ArrayExpression or ArrayPattern node to the ignore list.
* @param {ASTNode} node An ArrayExpression or ArrayPattern node.
* @returns {void}
*/
function addNullElementsToIgnoreList(node) {
var previousToken = context.getFirstToken(node);
node.elements.forEach(function(element) {
var token;
if (element === null) {
token = context.getTokenAfter(previousToken);
if (isComma(token)) {
commaTokensToIgnore.push(token);
}
} else {
token = context.getTokenAfter(element);
}
previousToken = token;
});
}
//--------------------------------------------------------------------------
// Public
//--------------------------------------------------------------------------
return {
"Program:exit": function() {
var previousToken,
nextToken;
tokensAndComments.forEach(function(token, i) {
if (!isComma(token)) {
return;
}
if (token && token.type === "JSXText") {
return;
}
previousToken = tokensAndComments[i - 1];
nextToken = tokensAndComments[i + 1];
validateCommaItemSpacing({
comma: token,
left: isComma(previousToken) || commaTokensToIgnore.indexOf(token) > -1 ? null : previousToken,
right: isComma(nextToken) ? null : nextToken
}, token);
});
},
"ArrayExpression": addNullElementsToIgnoreList,
"ArrayPattern": addNullElementsToIgnoreList
};
};
module.exports.schema = [
{
"type": "object",
"properties": {
"before": {
"type": "boolean"
},
"after": {
"type": "boolean"
}
},
"additionalProperties": false
}
];