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template-tag-spacing.js
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template-tag-spacing.js
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"use strict";
const { getSourceCode } = require("eslint-compat-utils");
/**
* Get the messageId for before tag open
* @param {number} expectedSpaces The number of expected spaces
* @param {number} actualSpaces The number of actual spaces
* @returns {string} The messageId
*/
function getMessageIdForTagOpen(expectedSpaces, actualSpaces) {
if (expectedSpaces === 0) {
if (actualSpaces === 1) {
return "unexpectedAfterTagOpen";
}
return "expectedNoSpacesAfterTagOpenButNSpaces";
}
if (actualSpaces === 0) {
return "missingAfterTagOpen";
}
return "expectedOneSpaceAfterTagOpenButNSpaces";
}
/**
* Get the messageId for after tag close
* @param {number} expectedSpaces The number of expected spaces
* @param {number} actualSpaces The number of actual spaces
* @returns {string} The messageId
*/
function getMessageIdForTagClose(expectedSpaces, actualSpaces) {
if (expectedSpaces === 0) {
if (actualSpaces === 1) {
return "unexpectedBeforeTagClose";
}
return "expectedNoSpacesBeforeTagCloseButNSpaces";
}
if (actualSpaces === 0) {
return "missingBeforeTagClose";
}
return "expectedOneSpaceBeforeTagCloseButNSpaces";
}
module.exports = {
meta: {
docs: {
description:
"enforce unified spacing in micro-template tag. (ex. :ok: `<%= prop %>`, :ng: `<%=prop%>`)",
category: "recommended",
url: "https://ota-meshi.github.io/eslint-plugin-lodash-template/rules/template-tag-spacing.html",
},
fixable: "whitespace",
messages: {
unexpectedAfterTagOpen:
"Expected no spaces after `{{chars}}`, but 1 space found.",
expectedNoSpacesAfterTagOpenButNSpaces:
"Expected no spaces after `{{chars}}`, but {{n}} spaces found.",
missingAfterTagOpen:
"Expected 1 space after `{{chars}}`, but no spaces found.",
expectedOneSpaceAfterTagOpenButNSpaces:
"Expected 1 space after `{{chars}}`, but {{n}} spaces found.",
unexpectedBeforeTagClose:
"Expected no spaces before `{{chars}}`, but 1 space found.",
expectedNoSpacesBeforeTagCloseButNSpaces:
"Expected no spaces before `{{chars}}`, but {{n}} spaces found.",
missingBeforeTagClose:
"Expected 1 space before `{{chars}}`, but no spaces found.",
expectedOneSpaceBeforeTagCloseButNSpaces:
"Expected 1 space before `{{chars}}`, but {{n}} spaces found.",
},
schema: [
{
enum: ["always", "never"],
},
],
type: "layout",
},
create(context) {
const sourceCode = getSourceCode(context);
if (!sourceCode.parserServices.getMicroTemplateService) {
return {};
}
const options = context.options[0] || "always";
const microTemplateService =
sourceCode.parserServices.getMicroTemplateService();
/**
* Check whether the line numbers in the given indices are equal.
* @param {number} index1 The index
* @param {number} index2 The index
* @returns {boolean} `true` if the line numbers in the indices are equal.
*/
function equalLine(index1, index2) {
return (
sourceCode.getLocFromIndex(index1).line ===
sourceCode.getLocFromIndex(index2).line
);
}
/**
* process micro-template node
* @param {ASTNode} node The AST node.
* @returns {void} undefined.
*/
function processNode(node) {
const openBrace = node.expressionStart;
const closeBrace = node.expressionEnd;
const interpolate = node.code;
const entity = interpolate.trim();
if (!entity) {
return;
}
const firstCharIndex =
openBrace.range[1] + interpolate.indexOf(entity);
const lastCharIndex = firstCharIndex + entity.length;
const actualOpenSpaces = firstCharIndex - openBrace.range[1];
const actualCloseSpaces = closeBrace.range[0] - lastCharIndex;
const expectedSpaces = options === "always" ? 1 : 0;
if (
expectedSpaces !== actualOpenSpaces &&
equalLine(openBrace.range[1], firstCharIndex)
) {
context.report({
node: openBrace,
messageId: getMessageIdForTagOpen(
expectedSpaces,
actualOpenSpaces,
),
data: {
chars: openBrace.chars,
n: actualOpenSpaces,
},
fix(fixer) {
const range = [openBrace.range[1], firstCharIndex];
const text = " ".repeat(expectedSpaces);
return fixer.replaceTextRange(range, text);
},
});
}
if (
expectedSpaces !== actualCloseSpaces &&
equalLine(lastCharIndex, closeBrace.range[0])
) {
context.report({
node: closeBrace,
messageId: getMessageIdForTagClose(
expectedSpaces,
actualCloseSpaces,
),
data: {
chars: closeBrace.chars,
n: actualCloseSpaces,
},
fix(fixer) {
const range = [lastCharIndex, closeBrace.range[0]];
const text = " ".repeat(expectedSpaces);
return fixer.replaceTextRange(range, text);
},
});
}
}
return {
"Program:exit"() {
microTemplateService.traverseMicroTemplates({
MicroTemplateEscape: processNode,
MicroTemplateInterpolate: processNode,
MicroTemplateEvaluate: processNode,
});
},
};
},
};