1 | 'use strict';
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2 |
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3 | const report = require('../../utils/report');
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4 | const ruleMessages = require('../../utils/ruleMessages');
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5 | const validateOptions = require('../../utils/validateOptions');
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6 |
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7 | const ruleName = 'unicode-bom';
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8 |
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9 | const messages = ruleMessages(ruleName, {
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10 | expected: 'Expected Unicode BOM',
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11 | rejected: 'Unexpected Unicode BOM',
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12 | });
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13 |
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14 | function rule(expectation) {
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15 | return (root, result) => {
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16 | const validOptions = validateOptions(result, ruleName, {
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17 | actual: expectation,
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18 | possible: ['always', 'never'],
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19 | });
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20 |
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21 | if (
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22 | !validOptions ||
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23 | root.source.inline ||
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24 | root.source.lang === 'object-literal' ||
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25 |
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26 | root.document !== undefined
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27 | ) {
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28 | return;
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29 | }
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30 |
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31 | const { hasBOM } = root.source.input;
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32 |
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33 | if (expectation === 'always' && !hasBOM) {
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34 | report({
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35 | result,
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36 | ruleName,
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37 | message: messages.expected,
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38 | root,
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39 | line: 1,
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40 | });
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41 | }
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42 |
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43 | if (expectation === 'never' && hasBOM) {
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44 | report({
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45 | result,
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46 | ruleName,
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47 | message: messages.rejected,
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48 | root,
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49 | line: 1,
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50 | });
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51 | }
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52 | };
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53 | }
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54 |
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55 | rule.ruleName = ruleName;
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56 | rule.messages = messages;
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57 | module.exports = rule;
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