can1357
c0faf597c2
- Preflighted write policies for all sections before any commit in multi-section batches. - Rejected duplicate canonical targets (e.g., `a.ts` and `./a.ts`) before writes begin. - Fixed `after_anchor` normalization mutating cached edits across repeated patch applications. - Fixed `detectLineEnding` to use first-occurrence style instead of majority vote.
39 lines
1.4 KiB
TypeScript
39 lines
1.4 KiB
TypeScript
/**
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* Minimal text-shape normalization: line-ending detection / round-trip and
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* BOM stripping. The patcher uses these to canonicalize text to LF before
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* applying edits and to restore the original shape on write-back.
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*/
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export type LineEnding = "\r\n" | "\n";
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/** Detect the first line ending style in `content`. Defaults to LF when neither is present. */
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export function detectLineEnding(content: string): LineEnding {
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const crlfIdx = content.indexOf("\r\n");
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const lfIdx = content.indexOf("\n");
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if (lfIdx === -1) return "\n";
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if (crlfIdx === -1) return "\n";
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return crlfIdx < lfIdx ? "\r\n" : "\n";
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}
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/** Normalize every line ending to LF. */
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export function normalizeToLF(text: string): string {
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return text.replace(/\r\n?/g, "\n");
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}
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/** Re-encode LF text with the requested line ending. */
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export function restoreLineEndings(text: string, ending: LineEnding): string {
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return ending === "\r\n" ? text.replace(/\n/g, "\r\n") : text;
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}
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export interface BomResult {
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/** Either the empty string or the BOM sequence (currently UTF-8 BOM). */
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bom: string;
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/** Text with any leading BOM removed. */
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text: string;
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}
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/** Strip a UTF-8 BOM if present and return both the BOM and the trailing text. */
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export function stripBom(content: string): BomResult {
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return content.startsWith("\uFEFF") ? { bom: "\uFEFF", text: content.slice(1) } : { bom: "", text: content };
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}
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