74 lines
2.1 KiB
Plaintext
74 lines
2.1 KiB
Plaintext
// Jest Snapshot v1, https://goo.gl/fbAQLP
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exports[`UnicodeUtils.js 1`] = `
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/**
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* @flow
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*/
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/**
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* @param {number} codeUnit A Unicode code-unit, in range [0, 0x10FFFF]
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* @return {boolean} Whether code-unit is in a surrogate (hi/low) range
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*/
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function inSurrogateRange(codeUnit) {
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return 0xD800 <= codeUnit && codeUnit <= 0xDFFF;
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}
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/**
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* Return the length of the original Unicode character at given position in the
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* String by looking into the UTF-16 code unit; that is equal to 1 for any
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* non-surrogate characters in BMP ([U+0000..U+D7FF] and [U+E000, U+FFFF]); and
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* returns 2 for the hi/low surrogates ([U+D800..U+DFFF]), which are in fact
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* representing non-BMP characters ([U+10000..U+10FFFF]).
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*
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* Examples:
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* - '\\u0020' => 1
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* - '\\u3020' => 1
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* - '\\uD835' => 2
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* - '\\uD835\\uDDEF' => 2
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* - '\\uDDEF' => 2
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*
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* @param {string} str Non-empty string
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* @param {number} pos Position in the string to look for one code unit
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* @return {number} Number 1 or 2
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*/
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function utf16Length(str, pos) {
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return 1 + inSurrogateRange(str.charCodeAt(pos));
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}
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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/**
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* @flow
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*/
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/**
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* @param {number} codeUnit A Unicode code-unit, in range [0, 0x10FFFF]
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* @return {boolean} Whether code-unit is in a surrogate (hi/low) range
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*/
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function inSurrogateRange(codeUnit) {
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return 0xd800 <= codeUnit && codeUnit <= 0xdfff;
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}
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/**
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* Return the length of the original Unicode character at given position in the
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* String by looking into the UTF-16 code unit; that is equal to 1 for any
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* non-surrogate characters in BMP ([U+0000..U+D7FF] and [U+E000, U+FFFF]); and
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* returns 2 for the hi/low surrogates ([U+D800..U+DFFF]), which are in fact
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* representing non-BMP characters ([U+10000..U+10FFFF]).
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*
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* Examples:
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* - '\\u0020' => 1
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* - '\\u3020' => 1
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* - '\\uD835' => 2
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* - '\\uD835\\uDDEF' => 2
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* - '\\uDDEF' => 2
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*
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* @param {string} str Non-empty string
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* @param {number} pos Position in the string to look for one code unit
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* @return {number} Number 1 or 2
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*/
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function utf16Length(str, pos) {
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return 1 + inSurrogateRange(str.charCodeAt(pos));
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}
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`;
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