mirror of https://gitee.com/openkylin/nodejs.git
61 lines
1.9 KiB
JavaScript
61 lines
1.9 KiB
JavaScript
'use strict';
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const common = require('../common');
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const assert = require('assert');
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const fs = require('fs');
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const rl = require('readline');
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const fixtures = require('../common/fixtures');
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const BOM = '\uFEFF';
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// Get the data using a non-stream way to compare with the streamed data.
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const modelData = fixtures.readSync('file-to-read-without-bom.txt', 'utf8');
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const modelDataFirstCharacter = modelData[0];
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// Detect the number of forthcoming 'line' events for mustCall() 'expected' arg.
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const lineCount = modelData.match(/\n/g).length;
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// Ensure both without-bom and with-bom test files are textwise equal.
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assert.strictEqual(fixtures.readSync('file-to-read-with-bom.txt', 'utf8'),
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`${BOM}${modelData}`
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);
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// An unjustified BOM stripping with a non-BOM character unshifted to a stream.
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const inputWithoutBOM =
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fs.createReadStream(fixtures.path('file-to-read-without-bom.txt'), 'utf8');
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inputWithoutBOM.once('readable', common.mustCall(() => {
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const maybeBOM = inputWithoutBOM.read(1);
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assert.strictEqual(maybeBOM, modelDataFirstCharacter);
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assert.notStrictEqual(maybeBOM, BOM);
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inputWithoutBOM.unshift(maybeBOM);
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let streamedData = '';
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rl.createInterface({
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input: inputWithoutBOM,
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}).on('line', common.mustCall((line) => {
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streamedData += `${line}\n`;
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}, lineCount)).on('close', common.mustCall(() => {
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assert.strictEqual(streamedData, modelData);
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}));
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}));
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// A justified BOM stripping.
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const inputWithBOM =
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fs.createReadStream(fixtures.path('file-to-read-with-bom.txt'), 'utf8');
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inputWithBOM.once('readable', common.mustCall(() => {
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const maybeBOM = inputWithBOM.read(1);
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assert.strictEqual(maybeBOM, BOM);
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let streamedData = '';
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rl.createInterface({
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input: inputWithBOM,
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}).on('line', common.mustCall((line) => {
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streamedData += `${line}\n`;
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}, lineCount)).on('close', common.mustCall(() => {
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assert.strictEqual(streamedData, modelData);
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}));
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}));
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