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/**
* Copyright (c) 2013-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @providesModule UnicodeUtilsExtra
* @typechecks
*/
/**
* Unicode-enabled extra utility functions not always needed.
*/
'use strict';
const UnicodeUtils = require('./UnicodeUtils');
/**
* @param {number} codePoint Valid Unicode code-point
* @param {number} len Zero-padded minimum width of result
* @return {string} A zero-padded hexadecimal string (00XXXX)
*/
function zeroPaddedHex(codePoint, len) {
let codePointHex = codePoint.toString(16).toUpperCase();
let numZeros = Math.max(0, len - codePointHex.length);
var result = '';
for (var i = 0; i < numZeros; i++) {
result += '0';
}
result += codePointHex;
return result;
}
/**
* @param {number} codePoint Valid Unicode code-point
* @return {string} A formatted Unicode code-point string
* of the format U+XXXX, U+XXXXX, or U+XXXXXX
*/
function formatCodePoint(codePoint) {
codePoint = codePoint || 0; // NaN --> 0
var formatted = '';
if (codePoint <= 0xFFFF) {
formatted = zeroPaddedHex(codePoint, 4);
} else {
formatted = codePoint.toString(16).toUpperCase();
}
return 'U+' + formatted;
}
/**
* Get a list of formatted (string) Unicode code-points from a String
*
* @param {string} str Valid Unicode string
* @return {array<string>} A list of formatted code-point strings
*/
function getCodePointsFormatted(str) {
const codePoints = UnicodeUtils.getCodePoints(str);
return codePoints.map(formatCodePoint);
}
const specialEscape = {
0x07: '\\a',
0x08: '\\b',
0x0C: '\\f',
0x0A: '\\n',
0x0D: '\\r',
0x09: '\\t',
0x0B: '\\v',
0x22: '\\"',
0x5c: '\\\\'
};
/**
* Returns a double-quoted PHP string with all non-printable and
* non-US-ASCII sequences escaped.
*
* @param {string} str Valid Unicode string
* @return {string} Double-quoted string with Unicode sequences escaped
*/
function phpEscape(s) {
var result = '"';
for (let cp of UnicodeUtils.getCodePoints(s)) {
let special = specialEscape[cp];
if (special !== undefined) {
result += special;
} else if (cp >= 0x20 && cp <= 0x7e) {
result += String.fromCodePoint(cp);
} else if (cp <= 0xFFFF) {
result += '\\u{' + zeroPaddedHex(cp, 4) + '}';
} else {
result += '\\u{' + zeroPaddedHex(cp, 6) + '}';
}
}
result += '"';
return result;
}
/**
* Returns a double-quoted Java or JavaScript string with all
* non-printable and non-US-ASCII sequences escaped.
*
* @param {string} str Valid Unicode string
* @return {string} Double-quoted string with Unicode sequences escaped
*/
function jsEscape(s) {
var result = '"';
for (var i = 0; i < s.length; i++) {
let cp = s.charCodeAt(i);
let special = specialEscape[cp];
if (special !== undefined) {
result += special;
} else if (cp >= 0x20 && cp <= 0x7e) {
result += String.fromCodePoint(cp);
} else {
result += '\\u' + zeroPaddedHex(cp, 4);
}
}
result += '"';
return result;
}
function c11Escape(s) {
var result = '';
for (let cp of UnicodeUtils.getCodePoints(s)) {
let special = specialEscape[cp];
if (special !== undefined) {
result += special;
} else if (cp >= 0x20 && cp <= 0x7e) {
result += String.fromCodePoint(cp);
} else if (cp <= 0xFFFF) {
result += '\\u' + zeroPaddedHex(cp, 4);
} else {
result += '\\U' + zeroPaddedHex(cp, 8);
}
}
return result;
}
/**
* Returns a double-quoted C string with all non-printable and
* non-US-ASCII sequences escaped.
*
* @param {string} str Valid Unicode string
* @return {string} Double-quoted string with Unicode sequences escaped
*/
function cEscape(s) {
return 'u8"' + c11Escape(s) + '"';
}
/**
* Returns a double-quoted Objective-C string with all non-printable
* and non-US-ASCII sequences escaped.
*
* @param {string} str Valid Unicode string
* @return {string} Double-quoted string with Unicode sequences escaped
*/
function objcEscape(s) {
return '@"' + c11Escape(s) + '"';
}
/**
* Returns a double-quoted Python string with all non-printable
* and non-US-ASCII sequences escaped.
*
* @param {string} str Valid Unicode string
* @return {string} Double-quoted string with Unicode sequences escaped
*/
function pyEscape(s) {
return 'u"' + c11Escape(s) + '"';
}
const UnicodeUtilsExtra = {
formatCodePoint: formatCodePoint,
getCodePointsFormatted: getCodePointsFormatted,
zeroPaddedHex: zeroPaddedHex,
phpEscape: phpEscape,
jsEscape: jsEscape,
cEscape: cEscape,
objcEscape: objcEscape,
pyEscape: pyEscape
};
module.exports = UnicodeUtilsExtra;
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