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‎.eslintrc‎
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‎.eslintrc‎
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diff --git a/Collapse file
‎tools/eslint-rules/align-function-arguments.js‎
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‎tools/eslint-rules/align-function-arguments.js‎
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+70Lines changed: 70 additions & 0 deletions
@@ -85,6 +85,7 @@ rules:
   prefer-const: 2
 
   # Custom rules in tools/eslint-rules
+  align-function-arguments: 2
   align-multiline-assignment: 2
   assert-fail-single-argument: 2
   new-with-error: [2, "Error", "RangeError", "TypeError", "SyntaxError", "ReferenceError"]
 
@@ -0,0 +1,70 @@
+/**
+ * @fileoverview Align arguments in multiline function calls
+ * @author Rich Trott
+ */
+'use strict';
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+function checkArgumentAlignment(context, node) {
+
+  function isNodeFirstInLine(node, byEndLocation) {
+    const firstToken = byEndLocation === true ? context.getLastToken(node, 1) :
+      context.getTokenBefore(node);
+    const startLine = byEndLocation === true ? node.loc.end.line :
+      node.loc.start.line;
+    const endLine = firstToken ? firstToken.loc.end.line : -1;
+
+    return startLine !== endLine;
+  }
+
+  if (node.arguments.length === 0)
+    return;
+
+  var msg = '';
+  const first = node.arguments[0];
+  var currentLine = first.loc.start.line;
+  const firstColumn = first.loc.start.column;
+
+  const ignoreTypes = [
+    'ArrowFunctionExpression',
+    'CallExpression',
+    'FunctionExpression',
+    'ObjectExpression',
+    'TemplateLiteral'
+  ];
+
+  const args = node.arguments;
+
+  // For now, don't bother trying to validate potentially complicating things
+  // like closures. Different people will have very different ideas and it's
+  // probably best to implement configuration options.
+  if (args.some((node) => { return ignoreTypes.indexOf(node.type) !== -1; })) {
+    return;
+  }
+
+  if (!isNodeFirstInLine(node)) {
+    return;
+  }
+
+  args.slice(1).forEach((argument) => {
+    if (argument.loc.start.line === currentLine + 1) {
+      if (argument.loc.start.column !== firstColumn) {
+        msg = 'Function called with argument in column ' +
+              `${argument.loc.start.column}, expected in ${firstColumn}`;
+      }
+    }
+    currentLine = argument.loc.start.line;
+  });
+
+  if (msg)
+    context.report(node, msg);
+}
+
+module.exports = function(context) {
+  return {
+    'CallExpression': (node) => checkArgumentAlignment(context, node)
+  };
+};