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merged 1 commit into from
Aug 11, 2025
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refactor(sprintf): replace abbreviations with words #4857

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134 changes: 69 additions & 65 deletions sprintf/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -51,137 +51,141 @@ const LOWERCASE_S_CODE = 115; /* s */
/**
* Format a string with placeholders using the provided arguments.
*
* @param str
* @param template
* Template.
* @param args
* @param values
* Values to interpolate.
* @returns
* Formatted string.
*/
export default function sprintf(str: string, ...args: unknown[]): string {
if (typeof str !== "string") {
export default function sprintf(
template: string,
...values: unknown[]
): string {
if (typeof template !== "string") {
throw new TypeError("First argument must be a string");
}

const argsLength = args.length;
if (argsLength === 0) {
return str;
if (values.length === 0) {
return template;
}

let output = "";
let argIdx = 0;
let valueIndex = 0;
let lastPosition = -1;
const strLength = str.length;
for (let i = 0; i < strLength; ) {
if (str.charCodeAt(i) === PERCENT_CODE && i + 1 < strLength) {
for (let index = 0; index < template.length; ) {
if (
template.charCodeAt(index) === PERCENT_CODE &&
index + 1 < template.length
) {
lastPosition = lastPosition > -1 ? lastPosition : 0;
switch (str.charCodeAt(i + 1)) {
switch (template.charCodeAt(index + 1)) {
case LOWERCASE_D_CODE:
case LOWERCASE_F_CODE: {
if (argIdx >= argsLength) {
if (valueIndex >= values.length) {
break;
}
const arg = args[argIdx];
if (typeof arg !== "number") {
const value = values[valueIndex];
if (typeof value !== "number") {
break;
}
if (lastPosition < i) {
output += str.slice(lastPosition, i);
if (lastPosition < index) {
output += template.slice(lastPosition, index);
}
output += arg;
lastPosition = i + 2;
i++;
output += value;
lastPosition = index + 2;
index++;
break;
}
case LOWERCASE_I_CODE: {
if (argIdx >= argsLength) {
if (valueIndex >= values.length) {
break;
}
const arg = args[argIdx];
if (typeof arg !== "number") {
const value = values[valueIndex];
if (typeof value !== "number") {
break;
}
if (lastPosition < i) {
output += str.slice(lastPosition, i);
if (lastPosition < index) {
output += template.slice(lastPosition, index);
}
output += Math.floor(arg);
lastPosition = i + 2;
i++;
output += Math.floor(value);
lastPosition = index + 2;
index++;
break;
}
case UPPERCASE_O_CODE:
case LOWERCASE_O_CODE:
case LOWERCASE_J_CODE: {
if (argIdx >= argsLength) {
if (valueIndex >= values.length) {
break;
}
const arg = args[argIdx];
if (arg === undefined) {
const value = values[valueIndex];
if (value === undefined) {
break;
}
if (lastPosition < i) {
output += str.slice(lastPosition, i);
if (lastPosition < index) {
output += template.slice(lastPosition, index);
}
if (typeof arg === "string") {
output += `'${arg}'`;
lastPosition = i + 2;
i++;
if (typeof value === "string") {
output += `'${value}'`;
lastPosition = index + 2;
index++;
break;
}
if (typeof arg === "bigint") {
if (typeof value === "bigint") {
output += `"[BigInt]"`;
lastPosition = i + 2;
i++;
lastPosition = index + 2;
index++;
break;
}
if (typeof arg === "function") {
output += arg.name || "<anonymous>";
lastPosition = i + 2;
i++;
if (typeof value === "function") {
output += value.name || "<anonymous>";
lastPosition = index + 2;
index++;
break;
}
output += tryStringify(arg);
lastPosition = i + 2;
i++;
output += tryStringify(value);
lastPosition = index + 2;
index++;
break;
}
case LOWERCASE_S_CODE: {
if (argIdx >= argsLength) {
if (valueIndex >= values.length) {
break;
}
const arg = args[argIdx];
if (typeof arg !== "string") {
const value = values[valueIndex];
if (typeof value !== "string") {
break;
}
if (lastPosition < i) {
output += str.slice(lastPosition, i);
if (lastPosition < index) {
output += template.slice(lastPosition, index);
}
output += arg;
lastPosition = i + 2;
i++;
output += value;
lastPosition = index + 2;
index++;
break;
}
case PERCENT_CODE: {
if (lastPosition < i) {
output += str.slice(lastPosition, i);
if (lastPosition < index) {
output += template.slice(lastPosition, index);
}
output += "%";
lastPosition = i + 2;
i++;
argIdx--;
lastPosition = index + 2;
index++;
valueIndex--;
break;
}
}
++argIdx;
++valueIndex;
}
++i;
++index;
}
if (lastPosition === -1) {
return str;
return template;
}

if (lastPosition < strLength) {
output += str.slice(lastPosition);
if (lastPosition < template.length) {
output += template.slice(lastPosition);
}

return output;
Expand Down