func-call-spacing.js
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/**
* @fileoverview Rule to control spacing within function calls
* @author Matt DuVall <http://www.mattduvall.com>
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const astUtils = require("./utils/ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "layout",
docs: {
description: "require or disallow spacing between function identifiers and their invocations",
category: "Stylistic Issues",
recommended: false,
url: "https://eslint.org/docs/rules/func-call-spacing"
},
fixable: "whitespace",
schema: {
anyOf: [
{
type: "array",
items: [
{
enum: ["never"]
}
],
minItems: 0,
maxItems: 1
},
{
type: "array",
items: [
{
enum: ["always"]
},
{
type: "object",
properties: {
allowNewlines: {
type: "boolean"
}
},
additionalProperties: false
}
],
minItems: 0,
maxItems: 2
}
]
},
messages: {
unexpected: "Unexpected newline between function name and paren.",
missing: "Missing space between function name and paren."
}
},
create(context) {
const never = context.options[0] !== "always";
const allowNewlines = !never && context.options[1] && context.options[1].allowNewlines;
const sourceCode = context.getSourceCode();
const text = sourceCode.getText();
/**
* Check if open space is present in a function name
* @param {ASTNode} node node to evaluate
* @param {Token} leftToken The last token of the callee. This may be the closing parenthesis that encloses the callee.
* @param {Token} rightToken Tha first token of the arguments. this is the opening parenthesis that encloses the arguments.
* @returns {void}
* @private
*/
function checkSpacing(node, leftToken, rightToken) {
const textBetweenTokens = text.slice(leftToken.range[1], rightToken.range[0]).replace(/\/\*.*?\*\//gu, "");
const hasWhitespace = /\s/u.test(textBetweenTokens);
const hasNewline = hasWhitespace && astUtils.LINEBREAK_MATCHER.test(textBetweenTokens);
/*
* never allowNewlines hasWhitespace hasNewline message
* F F F F Missing space between function name and paren.
* F F F T (Invalid `!hasWhitespace && hasNewline`)
* F F T T Unexpected newline between function name and paren.
* F F T F (OK)
* F T T F (OK)
* F T T T (OK)
* F T F T (Invalid `!hasWhitespace && hasNewline`)
* F T F F Missing space between function name and paren.
* T T F F (Invalid `never && allowNewlines`)
* T T F T (Invalid `!hasWhitespace && hasNewline`)
* T T T T (Invalid `never && allowNewlines`)
* T T T F (Invalid `never && allowNewlines`)
* T F T F Unexpected space between function name and paren.
* T F T T Unexpected space between function name and paren.
* T F F T (Invalid `!hasWhitespace && hasNewline`)
* T F F F (OK)
*
* T T Unexpected space between function name and paren.
* F F Missing space between function name and paren.
* F F T Unexpected newline between function name and paren.
*/
if (never && hasWhitespace) {
context.report({
node,
loc: leftToken.loc.start,
messageId: "unexpected",
fix(fixer) {
/*
* Only autofix if there is no newline
* https://github.com/eslint/eslint/issues/7787
*/
if (!hasNewline) {
return fixer.removeRange([leftToken.range[1], rightToken.range[0]]);
}
return null;
}
});
} else if (!never && !hasWhitespace) {
context.report({
node,
loc: leftToken.loc.start,
messageId: "missing",
fix(fixer) {
return fixer.insertTextBefore(rightToken, " ");
}
});
} else if (!never && !allowNewlines && hasNewline) {
context.report({
node,
loc: leftToken.loc.start,
messageId: "unexpected",
fix(fixer) {
return fixer.replaceTextRange([leftToken.range[1], rightToken.range[0]], " ");
}
});
}
}
return {
"CallExpression, NewExpression"(node) {
const lastToken = sourceCode.getLastToken(node);
const lastCalleeToken = sourceCode.getLastToken(node.callee);
const parenToken = sourceCode.getFirstTokenBetween(lastCalleeToken, lastToken, astUtils.isOpeningParenToken);
const prevToken = parenToken && sourceCode.getTokenBefore(parenToken);
// Parens in NewExpression are optional
if (!(parenToken && parenToken.range[1] < node.range[1])) {
return;
}
checkSpacing(node, prevToken, parenToken);
},
ImportExpression(node) {
const leftToken = sourceCode.getFirstToken(node);
const rightToken = sourceCode.getTokenAfter(leftToken);
checkSpacing(node, leftToken, rightToken);
}
};
}
};