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/**
* @fileoverview Disallows or enforces spaces inside computed properties.
* @author Jamund Ferguson
*/
"use strict";
const astUtils = require("../util/ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "layout",
docs: {
description: "enforce consistent spacing inside computed property brackets",
category: "Stylistic Issues",
recommended: false,
url: "https://eslint.org/docs/rules/computed-property-spacing"
},
fixable: "whitespace",
schema: [
{
enum: ["always", "never"]
}
],
messages: {
unexpectedSpaceBefore: "There should be no space before '{{tokenValue}}'.",
unexpectedSpaceAfter: "There should be no space after '{{tokenValue}}'.",
missingSpaceBefore: "A space is required before '{{tokenValue}}'.",
missingSpaceAfter: "A space is required after '{{tokenValue}}'."
}
},
create(context) {
const sourceCode = context.getSourceCode();
const propertyNameMustBeSpaced = context.options[0] === "always"; // default is "never"
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
/**
* Reports that there shouldn't be a space after the first token
* @param {ASTNode} node - The node to report in the event of an error.
* @param {Token} token - The token to use for the report.
* @param {Token} tokenAfter - The token after `token`.
* @returns {void}
*/
function reportNoBeginningSpace(node, token, tokenAfter) {
context.report({
node,
loc: token.loc.start,
messageId: "unexpectedSpaceAfter",
data: {
tokenValue: token.value
},
fix(fixer) {
return fixer.removeRange([token.range[1], tokenAfter.range[0]]);
}
});
}
/**
* Reports that there shouldn't be a space before the last token
* @param {ASTNode} node - The node to report in the event of an error.
* @param {Token} token - The token to use for the report.
* @param {Token} tokenBefore - The token before `token`.
* @returns {void}
*/
function reportNoEndingSpace(node, token, tokenBefore) {
context.report({
node,
loc: token.loc.start,
messageId: "unexpectedSpaceBefore",
data: {
tokenValue: token.value
},
fix(fixer) {
return fixer.removeRange([tokenBefore.range[1], token.range[0]]);
}
});
}
/**
* Reports that there should be a space after the first token
* @param {ASTNode} node - The node to report in the event of an error.
* @param {Token} token - The token to use for the report.
* @returns {void}
*/
function reportRequiredBeginningSpace(node, token) {
context.report({
node,
loc: token.loc.start,
messageId: "missingSpaceAfter",
data: {
tokenValue: token.value
},
fix(fixer) {
return fixer.insertTextAfter(token, " ");
}
});
}
/**
* Reports that there should be a space before the last token
* @param {ASTNode} node - The node to report in the event of an error.
* @param {Token} token - The token to use for the report.
* @returns {void}
*/
function reportRequiredEndingSpace(node, token) {
context.report({
node,
loc: token.loc.start,
messageId: "missingSpaceBefore",
data: {
tokenValue: token.value
},
fix(fixer) {
return fixer.insertTextBefore(token, " ");
}
});
}
/**
* Returns a function that checks the spacing of a node on the property name
* that was passed in.
* @param {string} propertyName The property on the node to check for spacing
* @returns {Function} A function that will check spacing on a node
*/
function checkSpacing(propertyName) {
return function(node) {
if (!node.computed) {
return;
}
const property = node[propertyName];
const before = sourceCode.getTokenBefore(property),
first = sourceCode.getFirstToken(property),
last = sourceCode.getLastToken(property),
after = sourceCode.getTokenAfter(property);
if (astUtils.isTokenOnSameLine(before, first)) {
if (propertyNameMustBeSpaced) {
if (!sourceCode.isSpaceBetweenTokens(before, first) && astUtils.isTokenOnSameLine(before, first)) {
reportRequiredBeginningSpace(node, before);
}
} else {
if (sourceCode.isSpaceBetweenTokens(before, first)) {
reportNoBeginningSpace(node, before, first);
}
}
}
if (astUtils.isTokenOnSameLine(last, after)) {
if (propertyNameMustBeSpaced) {
if (!sourceCode.isSpaceBetweenTokens(last, after) && astUtils.isTokenOnSameLine(last, after)) {
reportRequiredEndingSpace(node, after);
}
} else {
if (sourceCode.isSpaceBetweenTokens(last, after)) {
reportNoEndingSpace(node, after, last);
}
}
}
};
}
//--------------------------------------------------------------------------
// Public
//--------------------------------------------------------------------------
return {
Property: checkSpacing("key"),
MemberExpression: checkSpacing("property")
};
}
};