/
apply-disable-directives.js
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/
apply-disable-directives.js
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/**
* @fileoverview A module that filters reported problems based on `eslint-disable` and `eslint-enable` comments
* @author Teddy Katz
*/
"use strict";
const lodash = require("lodash");
/**
* Compares the locations of two objects in a source file
* @param {{line: number, column: number}} itemA The first object
* @param {{line: number, column: number}} itemB The second object
* @returns {number} A value less than 1 if itemA appears before itemB in the source file, greater than 1 if
* itemA appears after itemB in the source file, or 0 if itemA and itemB have the same location.
*/
function compareLocations(itemA, itemB) {
return itemA.line - itemB.line || itemA.column - itemB.column;
}
/**
* Returns whether a comment is alone on its line.
* @param {Comment} comment The comment node which will be deleted.
* @param {string} line Contents of the comment's line.
* @returns {boolean} Whether the comment is alone on its line.
*/
function commentIsAloneOnLine(comment, line) {
return comment.type === "Block" ? line.length === comment.value.length + "/**/".length : line.startsWith("//");
}
/**
* Finds where to remove text for an unused directive.
* @param {Directive} directive Unused directive to be removed.
* @param {SourceCode} sourceCode A SourceCode object for the given text
* @returns {Range} Removal range for the unused directive.
* @see https://github.com/eslint/rfcs/pull/78
*/
function getDirectiveRemovalRange(directive, sourceCode) {
const lineIndex = directive.unprocessedDirective.line - 1;
const lineStart = sourceCode.lineStartIndices[lineIndex];
const commentStart = lineStart + directive.unprocessedDirective.column - 1;
const comment = sourceCode.getTokenByRangeStart(commentStart, { includeComments: true });
const line = sourceCode.lines[lineIndex];
// If the directive's rule isn't the only one in the comment, only remove that rule
if (comment.value.includes(",")) {
const ruleStart = comment.value.indexOf(directive.ruleId);
const ruleEnd = ruleStart + directive.ruleId.length;
if (comment.value.trimRight().endsWith(directive.ruleId)) {
for (const prefix of [", ", ","]) {
if (comment.value.slice(ruleStart - prefix.length, ruleStart) === prefix) {
return [commentStart + 2 + ruleStart - prefix.length, commentStart + ruleEnd + 2];
}
}
} else {
for (const suffix of [", ", ","]) {
if (comment.value.slice(ruleEnd, ruleEnd + suffix.length) === suffix) {
return [commentStart + 2 + ruleStart, commentStart + 2 + ruleEnd + suffix.length];
}
}
}
return [commentStart + 2 + ruleStart, commentStart + 2 + ruleEnd];
}
// If the comment is alone on its line, remove the entire line
if (commentIsAloneOnLine(comment, line)) {
return [
lineStart,
lineIndex === sourceCode.lines.length - 1
? lineStart + line.length
: sourceCode.lineStartIndices[lineIndex + 1]
];
}
// If the comment has space between it and whatever else is on its line, collapse the space
if (commentStart !== 0 && ["\n", " "].includes(sourceCode.text[commentStart - 1])) {
if (comment.range[1] === sourceCode.text.length) {
return [comment.range[0] - 1, comment.range[1]];
}
if (sourceCode.text[comment.range[1]] === " ") {
return [comment.range[0], comment.range[1] + 1];
}
}
return comment.range;
}
/**
* This is the same as the exported function, except that it
* doesn't handle disable-line and disable-next-line directives, and it always reports unused
* disable directives.
* @param {Object} options options for applying directives. This is the same as the options
* for the exported function, except that `reportUnusedDisableDirectives` is not supported
* (this function always reports unused disable directives).
* @returns {{problems: Problem[], unusedDisableDirectives: Problem[]}} An object with a list
* of filtered problems and unused eslint-disable directives
*/
function applyDirectives(options) {
const problems = [];
let nextDirectiveIndex = 0;
let currentGlobalDisableDirective = null;
const disabledRuleMap = new Map();
// enabledRules is only used when there is a current global disable directive.
const enabledRules = new Set();
const usedDisableDirectives = new Set();
for (const problem of options.problems) {
while (
nextDirectiveIndex < options.directives.length &&
compareLocations(options.directives[nextDirectiveIndex], problem) <= 0
) {
const directive = options.directives[nextDirectiveIndex++];
switch (directive.type) {
case "disable":
if (directive.ruleId === null) {
currentGlobalDisableDirective = directive;
disabledRuleMap.clear();
enabledRules.clear();
} else if (currentGlobalDisableDirective) {
enabledRules.delete(directive.ruleId);
disabledRuleMap.set(directive.ruleId, directive);
} else {
disabledRuleMap.set(directive.ruleId, directive);
}
break;
case "enable":
if (directive.ruleId === null) {
currentGlobalDisableDirective = null;
disabledRuleMap.clear();
} else if (currentGlobalDisableDirective) {
enabledRules.add(directive.ruleId);
disabledRuleMap.delete(directive.ruleId);
} else {
disabledRuleMap.delete(directive.ruleId);
}
break;
// no default
}
}
if (disabledRuleMap.has(problem.ruleId)) {
usedDisableDirectives.add(disabledRuleMap.get(problem.ruleId));
} else if (currentGlobalDisableDirective && !enabledRules.has(problem.ruleId)) {
usedDisableDirectives.add(currentGlobalDisableDirective);
} else {
problems.push(problem);
}
}
const unusedDisableDirectives = options.directives
.filter(directive => directive.type === "disable" && !usedDisableDirectives.has(directive))
.map(directive => ({
fix: {
range: getDirectiveRemovalRange(directive, options.sourceCode),
text: ""
},
ruleId: null,
message: directive.ruleId
? `Unused eslint-disable directive (no problems were reported from '${directive.ruleId}').`
: "Unused eslint-disable directive (no problems were reported).",
line: directive.unprocessedDirective.line,
column: directive.unprocessedDirective.column,
severity: options.reportUnusedDisableDirectives === "warn" ? 1 : 2,
nodeType: null
}));
return { problems, unusedDisableDirectives };
}
/**
* Given a list of directive comments (i.e. metadata about eslint-disable and eslint-enable comments) and a list
* of reported problems, determines which problems should be reported.
* @param {Object} options Information about directives and problems
* @param {{
* type: ("disable"|"enable"|"disable-line"|"disable-next-line"),
* ruleId: (string|null),
* line: number,
* column: number
* }} options.directives Directive comments found in the file, with one-based columns.
* Two directive comments can only have the same location if they also have the same type (e.g. a single eslint-disable
* comment for two different rules is represented as two directives).
* @param {{ruleId: (string|null), line: number, column: number}[]} options.problems
* A list of problems reported by rules, sorted by increasing location in the file, with one-based columns.
* @param {"off" | "warn" | "error"} options.reportUnusedDisableDirectives If `"warn"` or `"error"`, adds additional problems for unused directives
* @param {SourceCode} options.sourceCode A SourceCode object for the given text
* @returns {{ruleId: (string|null), line: number, column: number}[]}
* A list of reported problems that were not disabled by the directive comments.
*/
module.exports = ({ directives, problems, reportUnusedDisableDirectives = "off", sourceCode }) => {
const blockDirectives = directives
.filter(directive => directive.type === "disable" || directive.type === "enable")
.map(directive => Object.assign({}, directive, { unprocessedDirective: directive }))
.sort(compareLocations);
const lineDirectives = lodash.flatMap(directives, directive => {
switch (directive.type) {
case "disable":
case "enable":
return [];
case "disable-line":
return [
{ type: "disable", line: directive.line, column: 1, ruleId: directive.ruleId, unprocessedDirective: directive },
{ type: "enable", line: directive.line + 1, column: 0, ruleId: directive.ruleId, unprocessedDirective: directive }
];
case "disable-next-line":
return [
{ type: "disable", line: directive.line + 1, column: 1, ruleId: directive.ruleId, unprocessedDirective: directive },
{ type: "enable", line: directive.line + 2, column: 0, ruleId: directive.ruleId, unprocessedDirective: directive }
];
default:
throw new TypeError(`Unrecognized directive type '${directive.type}'`);
}
}).sort(compareLocations);
const blockDirectivesResult = applyDirectives({
problems,
directives: blockDirectives,
reportUnusedDisableDirectives,
sourceCode
});
const lineDirectivesResult = applyDirectives({
problems: blockDirectivesResult.problems,
directives: lineDirectives,
reportUnusedDisableDirectives,
sourceCode
});
return reportUnusedDisableDirectives !== "off"
? lineDirectivesResult.problems
.concat(blockDirectivesResult.unusedDisableDirectives)
.concat(lineDirectivesResult.unusedDisableDirectives)
.sort(compareLocations)
: lineDirectivesResult.problems;
};