65 lines
1.6 KiB
TypeScript
65 lines
1.6 KiB
TypeScript
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/**
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* Performs the following:
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* - Removes the first & last line, if they are empty
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* - Picks the indentation level from the first non-white line
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* - Dedents the following lines
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*/
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export function leftTrimDedent(input: string): Array<string> {
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let lines = input.split("\n");
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let output: Array<string> = [];
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// Ignore first line
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if (lines[0] === "" && lines.length > 1) {
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lines = lines.slice(1);
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}
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// Get indentation level of the first line
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let indentationLevel = 0;
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for (const char of lines[0]!) {
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if (char === " ") {
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indentationLevel += 1;
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} else {
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break;
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}
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}
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for (const line of lines) {
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// Ignore empty lines
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if (line === "") {
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output.push("");
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continue;
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}
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output.push(trimWhitespace(line, indentationLevel));
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}
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if (output.length > 1 && output[output.length - 1] === "") {
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output = output.slice(0, -1);
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}
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return output;
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}
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function trimWhitespace(input: string, count: number): string {
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let indentCount = 0;
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for (const char of input) {
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if (char === " ") {
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indentCount += 1;
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} else {
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break;
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}
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}
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if (indentCount >= count || indentCount == input.length) {
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return input.slice(count);
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} else {
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throw new Error(`Invalid indentation while trimming: Expected ${count} spaces, got ${indentCount}`);
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}
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}
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export function splitAndLast(s: string): string {
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const segments = s.split("/");
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return segments[segments.length - 1]!;
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}
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