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Now convert escaped unicode

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This commit is contained in:
Gregory Schier 2017-02-10 13:17:55 -08:00
parent 6afe3ace55
commit f6f148185d
1 changed files with 46 additions and 2 deletions
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48
app/common/prettify.js
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@ -8,6 +8,16 @@
* @returns {string}
*/
export function prettifyJson (json, indentChars) {
// Convert the unicode. To correctly mimic JSON.stringify(JSON.parse(json), null, indentChars)
// we need to convert all escaped unicode characters to proper unicode characters.
try {
json = _convertUnicode(json);
} catch (err) {
// Just in case (should never happen)
console.warn('Prettify failed to handle unicode', err);
}
let i = 0;
let il = json.length;
let tab = (typeof indentChars !== 'undefined') ? indentChars : ' ';
@ -18,7 +28,7 @@ export function prettifyJson (json, indentChars) {
let previousChar = null;
let nextChar = null;
for (;i < il; i += 1) {
for (; i < il; i += 1) {
currentChar = json.charAt(i);
previousChar = json.charAt(i - 1);
nextChar = json.charAt(i + 1);
@ -92,6 +102,40 @@ export function prettifyJson (json, indentChars) {
return newJson;
}
function _repeatString(s, count) {
function _repeatString (s, count) {
return new Array(count + 1).join(s);
}
/**
* Convert escaped unicode characters to real characters. Any JSON parser will do this by
* default. This is really fast too. Around 25ms for ~2MB of data with LOTS of unicode.
*
* @param originalStr
* @returns {string}
* @private
*/
function _convertUnicode (originalStr) {
let m;
let c;
let lastI = 0;
// Matches \u####
const unicodeRegex = /\\u([0-9a-fA-F]{4})/g;
let convertedStr = '';
while (m = unicodeRegex.exec(originalStr)) {
try {
c = String.fromCharCode(parseInt(m[1], 16));
convertedStr += originalStr.slice(lastI, m.index) + c;
lastI = m.index + 6;
} catch (err) {
// Some reason we couldn't convert a char. Should never actually happen
console.warn('Failed to convert unicode char', m[1], err);
}
}
// Finally, add the rest of the string to the end.
convertedStr += originalStr.slice(lastI, originalStr.length);
return convertedStr;
}