wehub-resource-sync
112 lines
3.0 KiB
TypeScript
112 lines
3.0 KiB
TypeScript
/**
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* Quote-aware composite-command splitter.
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*
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* Splits a shell command string on top-level `&&`, `||`, or `;` separators
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* (i.e. those NOT inside single quotes, double quotes, backtick subshells,
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* or `$(...)` subshells) and returns the LAST significant segment (trimmed).
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*
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* - No separator found → returns the input unchanged.
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* - Last segment is empty (e.g. trailing `&&`) → falls back to the previous non-empty one.
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* - O(n) char-by-char scan; zero RegExp over the full input (anti-ReDoS).
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*/
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export function lastCommandSegment(command: string): string {
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if (!command) return command;
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const segments: string[] = [];
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let current = 0; // start index of the current segment
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let depth = 0; // nesting depth for $(...) / (...)
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let inSingle = false;
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let inDouble = false;
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let inBacktick = false;
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const push = (end: number): void => {
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segments.push(command.slice(current, end));
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};
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for (let i = 0; i < command.length; i++) {
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const ch = command[i];
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// ── quote / subshell state tracking ──────────────────────────────────
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if (inSingle) {
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if (ch === "'") inSingle = false;
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continue;
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}
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if (inBacktick) {
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if (ch === "`") inBacktick = false;
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continue;
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}
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if (inDouble) {
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if (ch === '"') inDouble = false;
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// $( inside double-quotes still opens a subshell
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if (ch === "$" && command[i + 1] === "(") {
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depth++;
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i++; // skip the '('
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}
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continue;
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}
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if (depth > 0) {
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if (ch === "(") depth++;
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else if (ch === ")") depth--;
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continue;
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}
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// ── open new quote / subshell context ────────────────────────────────
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if (ch === "'") {
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inSingle = true;
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continue;
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}
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if (ch === '"') {
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inDouble = true;
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continue;
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}
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if (ch === "`") {
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inBacktick = true;
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continue;
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}
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if (ch === "$" && command[i + 1] === "(") {
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depth++;
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i++; // skip the '('
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continue;
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}
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if (ch === "(") {
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depth++;
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continue;
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}
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// ── top-level separator detection ─────────────────────────────────────
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if (ch === "&" && command[i + 1] === "&") {
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push(i);
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i += 1; // skip second '&'
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current = i + 1;
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continue;
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}
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if (ch === "|" && command[i + 1] === "|") {
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push(i);
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i += 1; // skip second '|'
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current = i + 1;
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continue;
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}
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if (ch === ";") {
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push(i);
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current = i + 1;
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continue;
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}
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}
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// push the remainder
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push(command.length);
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if (segments.length === 1) {
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// no top-level separator found → return unchanged
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return command;
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}
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// find the last non-empty (after trim) segment
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for (let i = segments.length - 1; i >= 0; i--) {
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const trimmed = segments[i].trim();
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if (trimmed) return trimmed;
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}
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return command;
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}
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