operator-linebreak.js
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/**
* @fileoverview Operator linebreak - enforces operator linebreak style of two types: after and before
* @author Benoît Zugmeyer
* @copyright 2015 Benoît Zugmeyer. All rights reserved.
*/
"use strict";
var assign = require("object-assign"),
astUtils = require("../ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
var usedDefaultGlobal = !context.options[0];
var globalStyle = context.options[0] || "after";
var options = context.options[1] || {};
var styleOverrides = options.overrides ? assign({}, options.overrides) : {};
if (usedDefaultGlobal && !styleOverrides["?"]) {
styleOverrides["?"] = "before";
}
if (usedDefaultGlobal && !styleOverrides[":"]) {
styleOverrides[":"] = "before";
}
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
/**
* Checks the operator placement
* @param {ASTNode} node The node to check
* @param {ASTNode} leftSide The node that comes before the operator in `node`
* @private
* @returns {void}
*/
function validateNode(node, leftSide) {
var leftToken = context.getLastToken(leftSide);
var operatorToken = context.getTokenAfter(leftToken);
// When the left part of a binary expression is a single expression wrapped in
// parentheses (ex: `(a) + b`), leftToken will be the last token of the expression
// and operatorToken will be the closing parenthesis.
// The leftToken should be the last closing parenthesis, and the operatorToken
// should be the token right after that.
while (operatorToken.value === ")") {
leftToken = operatorToken;
operatorToken = context.getTokenAfter(operatorToken);
}
var rightToken = context.getTokenAfter(operatorToken);
var operator = operatorToken.value;
var style = styleOverrides[operator] || globalStyle;
// if single line
if (astUtils.isTokenOnSameLine(leftToken, operatorToken) &&
astUtils.isTokenOnSameLine(operatorToken, rightToken)) {
return;
} else if (!astUtils.isTokenOnSameLine(leftToken, operatorToken) &&
!astUtils.isTokenOnSameLine(operatorToken, rightToken)) {
// lone operator
context.report(node, {
line: operatorToken.loc.end.line,
column: operatorToken.loc.end.column
}, "Bad line breaking before and after '" + operator + "'.");
} else if (style === "before" && astUtils.isTokenOnSameLine(leftToken, operatorToken)) {
context.report(node, {
line: operatorToken.loc.end.line,
column: operatorToken.loc.end.column
}, "'" + operator + "' should be placed at the beginning of the line.");
} else if (style === "after" && astUtils.isTokenOnSameLine(operatorToken, rightToken)) {
context.report(node, {
line: operatorToken.loc.end.line,
column: operatorToken.loc.end.column
}, "'" + operator + "' should be placed at the end of the line.");
} else if (style === "none") {
context.report(node, {
line: operatorToken.loc.end.line,
column: operatorToken.loc.end.column
}, "There should be no line break before or after '" + operator + "'");
}
}
/**
* Validates a binary expression using `validateNode`
* @param {BinaryExpression|LogicalExpression|AssignmentExpression} node node to be validated
* @returns {void}
*/
function validateBinaryExpression(node) {
validateNode(node, node.left);
}
//--------------------------------------------------------------------------
// Public
//--------------------------------------------------------------------------
return {
"BinaryExpression": validateBinaryExpression,
"LogicalExpression": validateBinaryExpression,
"AssignmentExpression": validateBinaryExpression,
"VariableDeclarator": function(node) {
if (node.init) {
validateNode(node, node.id);
}
},
"ConditionalExpression": function(node) {
validateNode(node, node.test);
validateNode(node, node.consequent);
}
};
};
module.exports.schema = [
{
"enum": ["after", "before", "none", null]
},
{
"type": "object",
"properties": {
"overrides": {
"type": "object",
"properties": {
"anyOf": {
"type": "string",
"enum": ["after", "before", "none"]
}
}
}
},
"additionalProperties": false
}
];