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Replace date format RegExp with simple/naive parser #141

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Replace date format RegExp with simple/naive parser #141

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36 changes: 30 additions & 6 deletions src/fmtDate.js
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Original file line number Diff line number Diff line change
Expand Up @@ -107,11 +107,35 @@ const subs = {

export function fmtDate(tpl) {
let parts = [];

let R = /\{([a-z]+)\}|[^{]+/yi, m;

while (m = R.exec(tpl))
parts.push(m[0][0] == '{' ? subs[m[1]] : m[0]);
let index = 0;

while(index < tpl.length) {
let literal = '';
while(tpl[index] !== '{' && index < tpl.length) {
literal += tpl[index];
index += 1;
}
parts.push(literal);

if(index < tpl.length && tpl[index] === '{') {
let template = '';
index += 1;
while(index < tpl.length) {
const char = tpl[index].toLowerCase();
if(char < 'a' || 'z' < char) break;
template += tpl[index];
index += 1;
}
if(tpl[index] !== '}') {
break;
}
if(template.length === 0) {
break;
}
parts.push(subs[template]);
index += 1;
}
}

return d => {
let out = '';
Expand All @@ -128,4 +152,4 @@ export function tzDate(date, tz) {
let date2 = new Date(date.toLocaleString('en-US', {timeZone: tz}));
date2.setMilliseconds(date[getMilliseconds]());
return date2;
}
}