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43 lines
1.9 KiB
43 lines
1.9 KiB
// Flags: --expose_internals
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'use strict';
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const common = require('../common');
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const assert = require('assert');
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const readline = require('internal/readline');
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if (!process.binding('config').hasIntl) {
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common.skip('missing intl... skipping test');
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return;
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}
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// Test column width
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assert.strictEqual(readline.getStringWidth('a'), 1);
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assert.strictEqual(readline.getStringWidth('丁'), 2);
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assert.strictEqual(readline.getStringWidth('\ud83d\udc78\ud83c\udfff'), 2);
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assert.strictEqual(readline.getStringWidth('👅'), 2);
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assert.strictEqual(readline.getStringWidth('\n'), 0);
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assert.strictEqual(readline.getStringWidth('\u200Ef\u200F'), 1);
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assert.strictEqual(readline.getStringWidth(97), 1);
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// The following is an emoji sequence. In some implementations, it is
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// represented as a single glyph, in other implementations as a sequence
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// of individual glyphs. By default, the algorithm will assume the single
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// glyph interpretation and return a value of 2. By passing the
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// expandEmojiSequence: true option, each component will be counted
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// individually.
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assert.strictEqual(readline.getStringWidth('👩👩👧👧'), 2);
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assert.strictEqual(
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readline.getStringWidth('👩👩👧👧', {expandEmojiSequence: true}), 8);
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// By default, unicode characters whose width is considered ambiguous will
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// be considered half-width. For these characters, getStringWidth will return
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// 1. In some contexts, however, it is more appropriate to consider them full
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// width. By default, the algorithm will assume half width. By passing
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// the ambiguousAsFullWidth: true option, ambiguous characters will be counted
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// as 2 columns.
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assert.strictEqual(readline.getStringWidth('\u01d4'), 1);
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assert.strictEqual(
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readline.getStringWidth('\u01d4', {ambiguousAsFullWidth: true}), 2);
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// Control chars and combining chars are zero
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assert.strictEqual(readline.getStringWidth('\u200E\n\u220A\u20D2'), 1);
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