67 lines
2.5 KiB
JavaScript
67 lines
2.5 KiB
JavaScript
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import { Scalar } from '../../nodes/Scalar.js';
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import { stringifyString } from '../../stringify/stringifyString.js';
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const binary = {
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identify: value => value instanceof Uint8Array,
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default: false,
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tag: 'tag:yaml.org,2002:binary',
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/**
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* Returns a Buffer in node and an Uint8Array in browsers
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*
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* To use the resulting buffer as an image, you'll want to do something like:
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*
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* const blob = new Blob([buffer], { type: 'image/jpeg' })
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* document.querySelector('#photo').src = URL.createObjectURL(blob)
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*/
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resolve(src, onError) {
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if (typeof Buffer === 'function') {
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return Buffer.from(src, 'base64');
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}
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else if (typeof atob === 'function') {
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// On IE 11, atob() can't handle newlines
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const str = atob(src.replace(/[\n\r]/g, ''));
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const buffer = new Uint8Array(str.length);
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for (let i = 0; i < str.length; ++i)
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buffer[i] = str.charCodeAt(i);
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return buffer;
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}
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else {
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onError('This environment does not support reading binary tags; either Buffer or atob is required');
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return src;
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}
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},
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stringify({ comment, type, value }, ctx, onComment, onChompKeep) {
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const buf = value; // checked earlier by binary.identify()
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let str;
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if (typeof Buffer === 'function') {
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str =
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buf instanceof Buffer
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? buf.toString('base64')
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: Buffer.from(buf.buffer).toString('base64');
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}
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else if (typeof btoa === 'function') {
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let s = '';
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for (let i = 0; i < buf.length; ++i)
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s += String.fromCharCode(buf[i]);
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str = btoa(s);
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}
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else {
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throw new Error('This environment does not support writing binary tags; either Buffer or btoa is required');
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}
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if (!type)
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type = Scalar.BLOCK_LITERAL;
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if (type !== Scalar.QUOTE_DOUBLE) {
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const lineWidth = Math.max(ctx.options.lineWidth - ctx.indent.length, ctx.options.minContentWidth);
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const n = Math.ceil(str.length / lineWidth);
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const lines = new Array(n);
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for (let i = 0, o = 0; i < n; ++i, o += lineWidth) {
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lines[i] = str.substr(o, lineWidth);
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}
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str = lines.join(type === Scalar.BLOCK_LITERAL ? '\n' : ' ');
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}
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return stringifyString({ comment, type, value: str }, ctx, onComment, onChompKeep);
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}
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};
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export { binary };
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