441 lines
16 KiB
JavaScript
441 lines
16 KiB
JavaScript
/**
|
|
* @fileoverview Rule to check for max length on a line.
|
|
* @author Matt DuVall <http://www.mattduvall.com>
|
|
* @deprecated in ESLint v8.53.0
|
|
*/
|
|
|
|
"use strict";
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Constants
|
|
//------------------------------------------------------------------------------
|
|
|
|
const OPTIONS_SCHEMA = {
|
|
type: "object",
|
|
properties: {
|
|
code: {
|
|
type: "integer",
|
|
minimum: 0
|
|
},
|
|
comments: {
|
|
type: "integer",
|
|
minimum: 0
|
|
},
|
|
tabWidth: {
|
|
type: "integer",
|
|
minimum: 0
|
|
},
|
|
ignorePattern: {
|
|
type: "string"
|
|
},
|
|
ignoreComments: {
|
|
type: "boolean"
|
|
},
|
|
ignoreStrings: {
|
|
type: "boolean"
|
|
},
|
|
ignoreUrls: {
|
|
type: "boolean"
|
|
},
|
|
ignoreTemplateLiterals: {
|
|
type: "boolean"
|
|
},
|
|
ignoreRegExpLiterals: {
|
|
type: "boolean"
|
|
},
|
|
ignoreTrailingComments: {
|
|
type: "boolean"
|
|
}
|
|
},
|
|
additionalProperties: false
|
|
};
|
|
|
|
const OPTIONS_OR_INTEGER_SCHEMA = {
|
|
anyOf: [
|
|
OPTIONS_SCHEMA,
|
|
{
|
|
type: "integer",
|
|
minimum: 0
|
|
}
|
|
]
|
|
};
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Rule Definition
|
|
//------------------------------------------------------------------------------
|
|
|
|
/** @type {import('../shared/types').Rule} */
|
|
module.exports = {
|
|
meta: {
|
|
deprecated: true,
|
|
replacedBy: [],
|
|
type: "layout",
|
|
|
|
docs: {
|
|
description: "Enforce a maximum line length",
|
|
recommended: false,
|
|
url: "https://eslint.org/docs/latest/rules/max-len"
|
|
},
|
|
|
|
schema: [
|
|
OPTIONS_OR_INTEGER_SCHEMA,
|
|
OPTIONS_OR_INTEGER_SCHEMA,
|
|
OPTIONS_SCHEMA
|
|
],
|
|
messages: {
|
|
max: "This line has a length of {{lineLength}}. Maximum allowed is {{maxLength}}.",
|
|
maxComment: "This line has a comment length of {{lineLength}}. Maximum allowed is {{maxCommentLength}}."
|
|
}
|
|
},
|
|
|
|
create(context) {
|
|
|
|
/*
|
|
* Inspired by http://tools.ietf.org/html/rfc3986#appendix-B, however:
|
|
* - They're matching an entire string that we know is a URI
|
|
* - We're matching part of a string where we think there *might* be a URL
|
|
* - We're only concerned about URLs, as picking out any URI would cause
|
|
* too many false positives
|
|
* - We don't care about matching the entire URL, any small segment is fine
|
|
*/
|
|
const URL_REGEXP = /[^:/?#]:\/\/[^?#]/u;
|
|
|
|
const sourceCode = context.sourceCode;
|
|
|
|
/**
|
|
* Computes the length of a line that may contain tabs. The width of each
|
|
* tab will be the number of spaces to the next tab stop.
|
|
* @param {string} line The line.
|
|
* @param {int} tabWidth The width of each tab stop in spaces.
|
|
* @returns {int} The computed line length.
|
|
* @private
|
|
*/
|
|
function computeLineLength(line, tabWidth) {
|
|
let extraCharacterCount = 0;
|
|
|
|
line.replace(/\t/gu, (match, offset) => {
|
|
const totalOffset = offset + extraCharacterCount,
|
|
previousTabStopOffset = tabWidth ? totalOffset % tabWidth : 0,
|
|
spaceCount = tabWidth - previousTabStopOffset;
|
|
|
|
extraCharacterCount += spaceCount - 1; // -1 for the replaced tab
|
|
});
|
|
return Array.from(line).length + extraCharacterCount;
|
|
}
|
|
|
|
// The options object must be the last option specified…
|
|
const options = Object.assign({}, context.options[context.options.length - 1]);
|
|
|
|
// …but max code length…
|
|
if (typeof context.options[0] === "number") {
|
|
options.code = context.options[0];
|
|
}
|
|
|
|
// …and tabWidth can be optionally specified directly as integers.
|
|
if (typeof context.options[1] === "number") {
|
|
options.tabWidth = context.options[1];
|
|
}
|
|
|
|
const maxLength = typeof options.code === "number" ? options.code : 80,
|
|
tabWidth = typeof options.tabWidth === "number" ? options.tabWidth : 4,
|
|
ignoreComments = !!options.ignoreComments,
|
|
ignoreStrings = !!options.ignoreStrings,
|
|
ignoreTemplateLiterals = !!options.ignoreTemplateLiterals,
|
|
ignoreRegExpLiterals = !!options.ignoreRegExpLiterals,
|
|
ignoreTrailingComments = !!options.ignoreTrailingComments || !!options.ignoreComments,
|
|
ignoreUrls = !!options.ignoreUrls,
|
|
maxCommentLength = options.comments;
|
|
let ignorePattern = options.ignorePattern || null;
|
|
|
|
if (ignorePattern) {
|
|
ignorePattern = new RegExp(ignorePattern, "u");
|
|
}
|
|
|
|
//--------------------------------------------------------------------------
|
|
// Helpers
|
|
//--------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Tells if a given comment is trailing: it starts on the current line and
|
|
* extends to or past the end of the current line.
|
|
* @param {string} line The source line we want to check for a trailing comment on
|
|
* @param {number} lineNumber The one-indexed line number for line
|
|
* @param {ASTNode} comment The comment to inspect
|
|
* @returns {boolean} If the comment is trailing on the given line
|
|
*/
|
|
function isTrailingComment(line, lineNumber, comment) {
|
|
return comment &&
|
|
(comment.loc.start.line === lineNumber && lineNumber <= comment.loc.end.line) &&
|
|
(comment.loc.end.line > lineNumber || comment.loc.end.column === line.length);
|
|
}
|
|
|
|
/**
|
|
* Tells if a comment encompasses the entire line.
|
|
* @param {string} line The source line with a trailing comment
|
|
* @param {number} lineNumber The one-indexed line number this is on
|
|
* @param {ASTNode} comment The comment to remove
|
|
* @returns {boolean} If the comment covers the entire line
|
|
*/
|
|
function isFullLineComment(line, lineNumber, comment) {
|
|
const start = comment.loc.start,
|
|
end = comment.loc.end,
|
|
isFirstTokenOnLine = !line.slice(0, comment.loc.start.column).trim();
|
|
|
|
return comment &&
|
|
(start.line < lineNumber || (start.line === lineNumber && isFirstTokenOnLine)) &&
|
|
(end.line > lineNumber || (end.line === lineNumber && end.column === line.length));
|
|
}
|
|
|
|
/**
|
|
* Check if a node is a JSXEmptyExpression contained in a single line JSXExpressionContainer.
|
|
* @param {ASTNode} node A node to check.
|
|
* @returns {boolean} True if the node is a JSXEmptyExpression contained in a single line JSXExpressionContainer.
|
|
*/
|
|
function isJSXEmptyExpressionInSingleLineContainer(node) {
|
|
if (!node || !node.parent || node.type !== "JSXEmptyExpression" || node.parent.type !== "JSXExpressionContainer") {
|
|
return false;
|
|
}
|
|
|
|
const parent = node.parent;
|
|
|
|
return parent.loc.start.line === parent.loc.end.line;
|
|
}
|
|
|
|
/**
|
|
* Gets the line after the comment and any remaining trailing whitespace is
|
|
* stripped.
|
|
* @param {string} line The source line with a trailing comment
|
|
* @param {ASTNode} comment The comment to remove
|
|
* @returns {string} Line without comment and trailing whitespace
|
|
*/
|
|
function stripTrailingComment(line, comment) {
|
|
|
|
// loc.column is zero-indexed
|
|
return line.slice(0, comment.loc.start.column).replace(/\s+$/u, "");
|
|
}
|
|
|
|
/**
|
|
* Ensure that an array exists at [key] on `object`, and add `value` to it.
|
|
* @param {Object} object the object to mutate
|
|
* @param {string} key the object's key
|
|
* @param {any} value the value to add
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function ensureArrayAndPush(object, key, value) {
|
|
if (!Array.isArray(object[key])) {
|
|
object[key] = [];
|
|
}
|
|
object[key].push(value);
|
|
}
|
|
|
|
/**
|
|
* Retrieves an array containing all strings (" or ') in the source code.
|
|
* @returns {ASTNode[]} An array of string nodes.
|
|
*/
|
|
function getAllStrings() {
|
|
return sourceCode.ast.tokens.filter(token => (token.type === "String" ||
|
|
(token.type === "JSXText" && sourceCode.getNodeByRangeIndex(token.range[0] - 1).type === "JSXAttribute")));
|
|
}
|
|
|
|
/**
|
|
* Retrieves an array containing all template literals in the source code.
|
|
* @returns {ASTNode[]} An array of template literal nodes.
|
|
*/
|
|
function getAllTemplateLiterals() {
|
|
return sourceCode.ast.tokens.filter(token => token.type === "Template");
|
|
}
|
|
|
|
|
|
/**
|
|
* Retrieves an array containing all RegExp literals in the source code.
|
|
* @returns {ASTNode[]} An array of RegExp literal nodes.
|
|
*/
|
|
function getAllRegExpLiterals() {
|
|
return sourceCode.ast.tokens.filter(token => token.type === "RegularExpression");
|
|
}
|
|
|
|
/**
|
|
*
|
|
* reduce an array of AST nodes by line number, both start and end.
|
|
* @param {ASTNode[]} arr array of AST nodes
|
|
* @returns {Object} accululated AST nodes
|
|
*/
|
|
function groupArrayByLineNumber(arr) {
|
|
const obj = {};
|
|
|
|
for (let i = 0; i < arr.length; i++) {
|
|
const node = arr[i];
|
|
|
|
for (let j = node.loc.start.line; j <= node.loc.end.line; ++j) {
|
|
ensureArrayAndPush(obj, j, node);
|
|
}
|
|
}
|
|
return obj;
|
|
}
|
|
|
|
/**
|
|
* Returns an array of all comments in the source code.
|
|
* If the element in the array is a JSXEmptyExpression contained with a single line JSXExpressionContainer,
|
|
* the element is changed with JSXExpressionContainer node.
|
|
* @returns {ASTNode[]} An array of comment nodes
|
|
*/
|
|
function getAllComments() {
|
|
const comments = [];
|
|
|
|
sourceCode.getAllComments()
|
|
.forEach(commentNode => {
|
|
const containingNode = sourceCode.getNodeByRangeIndex(commentNode.range[0]);
|
|
|
|
if (isJSXEmptyExpressionInSingleLineContainer(containingNode)) {
|
|
|
|
// push a unique node only
|
|
if (comments[comments.length - 1] !== containingNode.parent) {
|
|
comments.push(containingNode.parent);
|
|
}
|
|
} else {
|
|
comments.push(commentNode);
|
|
}
|
|
});
|
|
|
|
return comments;
|
|
}
|
|
|
|
/**
|
|
* Check the program for max length
|
|
* @param {ASTNode} node Node to examine
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function checkProgramForMaxLength(node) {
|
|
|
|
// split (honors line-ending)
|
|
const lines = sourceCode.lines,
|
|
|
|
// list of comments to ignore
|
|
comments = ignoreComments || maxCommentLength || ignoreTrailingComments ? getAllComments() : [];
|
|
|
|
// we iterate over comments in parallel with the lines
|
|
let commentsIndex = 0;
|
|
|
|
const strings = getAllStrings();
|
|
const stringsByLine = groupArrayByLineNumber(strings);
|
|
|
|
const templateLiterals = getAllTemplateLiterals();
|
|
const templateLiteralsByLine = groupArrayByLineNumber(templateLiterals);
|
|
|
|
const regExpLiterals = getAllRegExpLiterals();
|
|
const regExpLiteralsByLine = groupArrayByLineNumber(regExpLiterals);
|
|
|
|
lines.forEach((line, i) => {
|
|
|
|
// i is zero-indexed, line numbers are one-indexed
|
|
const lineNumber = i + 1;
|
|
|
|
/*
|
|
* if we're checking comment length; we need to know whether this
|
|
* line is a comment
|
|
*/
|
|
let lineIsComment = false;
|
|
let textToMeasure;
|
|
|
|
/*
|
|
* We can short-circuit the comment checks if we're already out of
|
|
* comments to check.
|
|
*/
|
|
if (commentsIndex < comments.length) {
|
|
let comment = null;
|
|
|
|
// iterate over comments until we find one past the current line
|
|
do {
|
|
comment = comments[++commentsIndex];
|
|
} while (comment && comment.loc.start.line <= lineNumber);
|
|
|
|
// and step back by one
|
|
comment = comments[--commentsIndex];
|
|
|
|
if (isFullLineComment(line, lineNumber, comment)) {
|
|
lineIsComment = true;
|
|
textToMeasure = line;
|
|
} else if (ignoreTrailingComments && isTrailingComment(line, lineNumber, comment)) {
|
|
textToMeasure = stripTrailingComment(line, comment);
|
|
|
|
// ignore multiple trailing comments in the same line
|
|
let lastIndex = commentsIndex;
|
|
|
|
while (isTrailingComment(textToMeasure, lineNumber, comments[--lastIndex])) {
|
|
textToMeasure = stripTrailingComment(textToMeasure, comments[lastIndex]);
|
|
}
|
|
} else {
|
|
textToMeasure = line;
|
|
}
|
|
} else {
|
|
textToMeasure = line;
|
|
}
|
|
if (ignorePattern && ignorePattern.test(textToMeasure) ||
|
|
ignoreUrls && URL_REGEXP.test(textToMeasure) ||
|
|
ignoreStrings && stringsByLine[lineNumber] ||
|
|
ignoreTemplateLiterals && templateLiteralsByLine[lineNumber] ||
|
|
ignoreRegExpLiterals && regExpLiteralsByLine[lineNumber]
|
|
) {
|
|
|
|
// ignore this line
|
|
return;
|
|
}
|
|
|
|
const lineLength = computeLineLength(textToMeasure, tabWidth);
|
|
const commentLengthApplies = lineIsComment && maxCommentLength;
|
|
|
|
if (lineIsComment && ignoreComments) {
|
|
return;
|
|
}
|
|
|
|
const loc = {
|
|
start: {
|
|
line: lineNumber,
|
|
column: 0
|
|
},
|
|
end: {
|
|
line: lineNumber,
|
|
column: textToMeasure.length
|
|
}
|
|
};
|
|
|
|
if (commentLengthApplies) {
|
|
if (lineLength > maxCommentLength) {
|
|
context.report({
|
|
node,
|
|
loc,
|
|
messageId: "maxComment",
|
|
data: {
|
|
lineLength,
|
|
maxCommentLength
|
|
}
|
|
});
|
|
}
|
|
} else if (lineLength > maxLength) {
|
|
context.report({
|
|
node,
|
|
loc,
|
|
messageId: "max",
|
|
data: {
|
|
lineLength,
|
|
maxLength
|
|
}
|
|
});
|
|
}
|
|
});
|
|
}
|
|
|
|
|
|
//--------------------------------------------------------------------------
|
|
// Public API
|
|
//--------------------------------------------------------------------------
|
|
|
|
return {
|
|
Program: checkProgramForMaxLength
|
|
};
|
|
|
|
}
|
|
};
|