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refactor: type-safe trimIndent

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Waldemar Reusch 2023-03-30 21:56:50 +02:00 committed by Waldemar Reusch
parent d55c62c073
commit ab5287a3d4
1 changed files with 10 additions and 6 deletions
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16
src/bin/tools/trimIndent.ts
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@ -2,7 +2,7 @@
* Concatenate the string fragments and interpolated values * Concatenate the string fragments and interpolated values
* to get a single string. * to get a single string.
*/ */
function populateTemplate(strings: TemplateStringsArray, ...args: any[]) { function populateTemplate(strings: TemplateStringsArray, ...args: unknown[]) {
const chunks = []; const chunks = [];
for (let i = 0; i < strings.length; i++) { for (let i = 0; i < strings.length; i++) {
let lastStringLineLength = 0; let lastStringLineLength = 0;
@ -14,7 +14,8 @@ function populateTemplate(strings: TemplateStringsArray, ...args: any[]) {
if (args[i]) { if (args[i]) {
// if the interpolation value has newlines, indent the interpolation values // if the interpolation value has newlines, indent the interpolation values
// using the last known string indent // using the last known string indent
chunks.push(args[i].replace(/([\r?\n])/g, "$1" + " ".repeat(lastStringLineLength))); const chunk = String(args[i]).replace(/([\r?\n])/g, "$1" + " ".repeat(lastStringLineLength));
chunks.push(chunk);
} }
} }
return chunks.join(""); return chunks.join("");
@ -23,14 +24,17 @@ function populateTemplate(strings: TemplateStringsArray, ...args: any[]) {
function trimIndentPrivate(removeEmptyLeadingAndTrailingLines: boolean, strings: TemplateStringsArray, ...args: any[]) { function trimIndentPrivate(removeEmptyLeadingAndTrailingLines: boolean, strings: TemplateStringsArray, ...args: any[]) {
// Remove initial and final newlines // Remove initial and final newlines
let string = populateTemplate(strings, ...args); let string = populateTemplate(strings, ...args);
if (removeEmptyLeadingAndTrailingLines) string = string.replace(/^[\r\n]/, "").replace(/[^\S\r\n]*[\r\n]$/, ""); if (removeEmptyLeadingAndTrailingLines) {
string = string.replace(/^[\r\n]/, "").replace(/[^\S\r\n]*[\r\n]$/, "");
}
const dents = string.match(/^([ \t])+/gm)?.map(s => s.length) ?? []; const dents = string.match(/^([ \t])+/gm)?.map(s => s.length) ?? [];
// No dents? no change required // No dents? no change required
if (!dents || dents.length == 0) return string; if (!dents || dents.length == 0) return string;
const minDent = Math.min(...dents); const minDent = Math.min(...dents);
// The min indentation is 0, no change needed // The min indentation is 0, no change needed
if (!minDent) return string; if (!minDent) return string;
const dedented = string.replace(new RegExp(`^${" ".repeat(minDent)}`, "gm"), ""); const re = new RegExp(`^${" ".repeat(minDent)}`, "gm");
const dedented = string.replace(re, "");
return dedented; return dedented;
} }
@ -38,7 +42,7 @@ function trimIndentPrivate(removeEmptyLeadingAndTrailingLines: boolean, strings:
* Shift all lines left by the *smallest* indentation level, * Shift all lines left by the *smallest* indentation level,
* and remove initial newline and all trailing spaces. * and remove initial newline and all trailing spaces.
*/ */
export default function trimIndent(strings: TemplateStringsArray, ...args: any[]) { export default function trimIndent(strings: TemplateStringsArray, ...args: unknown[]) {
return trimIndentPrivate(true, strings, ...args); return trimIndentPrivate(true, strings, ...args);
} }
@ -46,6 +50,6 @@ export default function trimIndent(strings: TemplateStringsArray, ...args: any[]
* Shift all lines left by the *smallest* indentation level, * Shift all lines left by the *smallest* indentation level,
* and _keep_ initial newline and all trailing spaces. * and _keep_ initial newline and all trailing spaces.
*/ */
trimIndent.keepLeadingAndTrailingNewlines = function (strings: TemplateStringsArray, ...args: any[]) { trimIndent.keepLeadingAndTrailingNewlines = function (strings: TemplateStringsArray, ...args: unknown[]) {
return trimIndentPrivate(false, strings, ...args); return trimIndentPrivate(false, strings, ...args);
}; };