pinetto
Version:
Isomorphic, opinionated logging library focusing on simplicity and readability. Supports child loggers.
63 lines • 2.38 kB
JavaScript
/*
* Initially vendored from the "fast-printf" package
* by Gajus Kuizinas, released under the BSD-3-Clause license,
* at commit 8372e5cbc7d4f16a655fd4c42077db0147c077af.
*
* https://github.com/gajus/fast-printf/blob/8372e5cbc7d4f16a655fd4c42077db0147c077af
*/
const TokenRule = /(?:%(?<flag>([+0-]|-\+))?(?<width>\d+)?(?<position>\d+\$)?(?<precision>\.\d+)?(?<conversion>[%BCESb-iosux]))|(\\%)/g;
export const tokenize = (subject) => {
let matchResult;
const tokens = [];
let argumentIndex = 0;
let lastIndex = 0;
let lastToken = null;
while ((matchResult = TokenRule.exec(subject)) !== null) {
if (matchResult.index > lastIndex) {
lastToken = {
literal: subject.slice(lastIndex, matchResult.index),
type: 'literal',
};
tokens.push(lastToken);
}
const match = matchResult[0];
lastIndex = matchResult.index + match.length;
if (match === '\\%' || match === '%%') {
if (lastToken && lastToken.type === 'literal') {
lastToken.literal += '%';
}
else {
lastToken = {
literal: '%',
type: 'literal',
};
tokens.push(lastToken);
}
}
else if (matchResult.groups) {
lastToken = {
conversion: matchResult.groups.conversion,
flag: matchResult.groups.flag || null,
placeholder: match,
position: matchResult.groups.position ? Number.parseInt(matchResult.groups.position, 10) - 1 : argumentIndex++,
precision: matchResult.groups.precision ? Number.parseInt(matchResult.groups.precision.slice(1), 10) : null,
type: 'placeholder',
width: matchResult.groups.width ? Number.parseInt(matchResult.groups.width, 10) : null,
};
tokens.push(lastToken);
}
}
if (lastIndex <= subject.length - 1) {
if (lastToken && lastToken.type === 'literal') {
lastToken.literal += subject.slice(lastIndex);
}
else {
tokens.push({
literal: subject.slice(lastIndex),
type: 'literal',
});
}
}
return tokens;
};
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