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/**
* @fileoverview Rule to flag block statements that do not use the one true brace style
* @author Ian Christian Myers
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
var style = context.options[0] || "1tbs";
var params = context.options[1] || {};
var OPEN_MESSAGE = "Opening curly brace does not appear on the same line as controlling statement.",
BODY_MESSAGE = "Statement inside of curly braces should be on next line.",
CLOSE_MESSAGE = "Closing curly brace does not appear on the same line as the subsequent block.",
CLOSE_MESSAGE_SINGLE = "Closing curly brace should be on the same line as opening curly brace or on the line after the previous block.",
CLOSE_MESSAGE_STROUSTRUP = "Closing curly brace appears on the same line as the subsequent block.";
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
/**
* Determines if a given node is a block statement.
* @param {ASTNode} node The node to check.
* @returns {boolean} True if the node is a block statement, false if not.
* @private
*/
function isBlock(node) {
return node && node.type === "BlockStatement";
}
/**
* Binds a list of properties to a function that verifies that the opening
* curly brace is on the same line as its controlling statement of a given
* node.
* @param {...string} The properties to check on the node.
* @returns {Function} A function that will perform the check on a node
* @private
*/
function checkBlock() {
var blockProperties = arguments;
return function(node) {
[].forEach.call(blockProperties, function(blockProp) {
var block = node[blockProp], previousToken, curlyToken, curlyTokenEnd, curlyTokensOnSameLine;
block = node[blockProp];
if (isBlock(block)) {
previousToken = context.getTokenBefore(block);
curlyToken = context.getFirstToken(block);
curlyTokenEnd = context.getLastToken(block);
curlyTokensOnSameLine = curlyToken.loc.start.line === curlyTokenEnd.loc.start.line;
if (previousToken.loc.start.line !== curlyToken.loc.start.line) {
context.report(node, OPEN_MESSAGE);
} else if (block.body.length && params.allowSingleLine) {
if (curlyToken.loc.start.line === block.body[0].loc.start.line && !curlyTokensOnSameLine) {
context.report(block.body[0], BODY_MESSAGE);
} else if (curlyTokenEnd.loc.start.line === block.body[block.body.length - 1].loc.start.line && !curlyTokensOnSameLine) {
context.report(block.body[block.body.length - 1], CLOSE_MESSAGE_SINGLE);
}
} else if (block.body.length && curlyToken.loc.start.line === block.body[0].loc.start.line) {
context.report(block.body[0], BODY_MESSAGE);
}
}
});
};
}
/**
* Enforces the configured brace style on IfStatements
* @param {ASTNode} node An IfStatement node.
* @returns {void}
* @private
*/
function checkIfStatement(node) {
var tokens,
alternateIsBlock = false,
alternateIsIfBlock = false;
checkBlock("consequent", "alternate")(node);
if (node.alternate) {
alternateIsBlock = isBlock(node.alternate);
alternateIsIfBlock = node.alternate.type === "IfStatement" && isBlock(node.alternate.consequent);
if (alternateIsBlock || alternateIsIfBlock) {
tokens = context.getTokensBefore(node.alternate, 2);
if (style === "1tbs") {
if (tokens[0].loc.start.line !== tokens[1].loc.start.line) {
context.report(node.alternate, CLOSE_MESSAGE);
}
} else if (style === "stroustrup") {
if (tokens[0].loc.start.line === tokens[1].loc.start.line) {
context.report(node.alternate, CLOSE_MESSAGE_STROUSTRUP);
}
}
}
}
}
/**
* Enforces the configured brace style on TryStatements
* @param {ASTNode} node A TryStatement node.
* @returns {void}
* @private
*/
function checkTryStatement(node) {
var tokens;
checkBlock("block", "finalizer")(node);
if (isBlock(node.finalizer)) {
tokens = context.getTokensBefore(node.finalizer, 2);
if (style === "1tbs") {
if (tokens[0].loc.start.line !== tokens[1].loc.start.line) {
context.report(node.finalizer, CLOSE_MESSAGE);
}
} else if (style === "stroustrup") {
if (tokens[0].loc.start.line === tokens[1].loc.start.line) {
context.report(node.finalizer, CLOSE_MESSAGE_STROUSTRUP);
}
}
}
}
/**
* Enforces the configured brace style on CatchClauses
* @param {ASTNode} node A CatchClause node.
* @returns {void}
* @private
*/
function checkCatchClause(node) {
var previousToken = context.getTokenBefore(node),
firstToken = context.getFirstToken(node);
checkBlock("body")(node);
if (isBlock(node.body)) {
if (style === "1tbs") {
if (previousToken.loc.start.line !== firstToken.loc.start.line) {
context.report(node, CLOSE_MESSAGE);
}
} else if (style === "stroustrup") {
if (previousToken.loc.start.line === firstToken.loc.start.line) {
context.report(node, CLOSE_MESSAGE_STROUSTRUP);
}
}
}
}
/**
* Enforces the configured brace style on SwitchStatements
* @param {ASTNode} node A SwitchStatement node.
* @returns {void}
* @private
*/
function checkSwitchStatement(node) {
var tokens;
if (node.cases && node.cases.length) {
tokens = context.getTokensBefore(node.cases[0], 2);
if (tokens[0].loc.start.line !== tokens[1].loc.start.line) {
context.report(node, OPEN_MESSAGE);
}
} else {
tokens = context.getLastTokens(node, 3);
if (tokens[0].loc.start.line !== tokens[1].loc.start.line) {
context.report(node, OPEN_MESSAGE);
}
}
}
//--------------------------------------------------------------------------
// Public API
//--------------------------------------------------------------------------
return {
"FunctionDeclaration": checkBlock("body"),
"FunctionExpression": checkBlock("body"),
"ArrowFunctionExpression": checkBlock("body"),
"IfStatement": checkIfStatement,
"TryStatement": checkTryStatement,
"CatchClause": checkCatchClause,
"DoWhileStatement": checkBlock("body"),
"WhileStatement": checkBlock("body"),
"WithStatement": checkBlock("body"),
"ForStatement": checkBlock("body"),
"ForInStatement": checkBlock("body"),
"ForOfStatement": checkBlock("body"),
"SwitchStatement": checkSwitchStatement
};
};
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