clean up for deployment

src/parser/CsvParser.ts

@@ -0,0 +1,106 @@
+import { CsvDialect } from "../dialect";
+import type {
+  CsvParseResult,
+  CsvParseResultArray,
+  CsvParseResultObject,
+  ICsvDialect,
+  IChunkSource,
+  ParseOptions,
+  RowArray,
+  RowObject,
+} from "../types";
+import { CsvRowTokenizer } from "./CsvRowTokenizer";
+
+export interface ICsvParser {
+  parseFromString(input: string, options?: ParseOptions): Promise<CsvParseResult>;
+  parseFromSource(source: IChunkSource, options?: ParseOptions): Promise<CsvParseResult>;
+}
+
+export class CsvParser implements ICsvParser {
+  public async parseFromString(input: string, options?: ParseOptions): Promise<CsvParseResult> {
+    const sourceModule = await import("../sources/StringSource");
+    const source = new sourceModule.StringChunkSource(input);
+    return this.parseFromSource(source, options);
+  }
+
+  public async parseFromSource(source: IChunkSource, options?: ParseOptions): Promise<CsvParseResult> {
+    const dialect = this.createDialect(options);
+    const tokenizer = new CsvRowTokenizer(dialect);
+
+    for await (const chunk of source.chunks()) {
+      tokenizer.pushChunk(chunk);
+    }
+
+    const rows = tokenizer.drain();
+    const sanitizedRows = this.postProcessRows(rows, options);
+
+    if ((options?.output ?? "array") === "object") {
+      return this.mapToObjects(sanitizedRows, options);
+    }
+
+    const result: CsvParseResultArray = {
+      headers: options?.hasHeader ? sanitizedRows[0] : undefined,
+      rows: options?.hasHeader ? sanitizedRows.slice(1) : sanitizedRows,
+    };
+    return result;
+  }
+
+  private createDialect(options?: ParseOptions): ICsvDialect {
+    const dialect = new CsvDialect(options?.dialect);
+    return dialect;
+  }
+
+  private postProcessRows(rows: RowArray[], options?: ParseOptions): RowArray[] {
+    const validate = options?.validateRowLength ?? true;
+    const skipEmpty = options?.skipEmptyLines ?? true;
+
+    const filtered = rows.filter((row) => {
+      if (!skipEmpty) return true;
+      return row.length > 1 || (row.length === 1 && row[0] !== "");
+    });
+
+    if (!validate || filtered.length === 0) return filtered;
+
+    const targetLength = filtered[0]!.length;
+    for (const row of filtered) {
+      if (row.length !== targetLength) {
+        if (row.length < targetLength) {
+          while (row.length < targetLength) row.push("");
+        } else {
+          row.length = targetLength;
+        }
+      }
+    }
+
+    return filtered;
+  }
+
+  private mapToObjects(rows: RowArray[], options?: ParseOptions): CsvParseResultObject {
+    const hasHeader = options?.hasHeader ?? true;
+    const headers = hasHeader ? rows[0] ?? [] : this.generateHeaders(rows[0]?.length ?? 0);
+    const rowStartIndex = hasHeader ? 1 : 0;
+    const objects: RowObject[] = [];
+
+    for (let index = rowStartIndex; index < rows.length; index += 1) {
+      const row = rows[index]!;
+      const obj: RowObject = {};
+      for (let c = 0; c < headers.length; c += 1) {
+        const key = headers[c] ?? `col${c}`;
+        obj[key] = row[c] ?? "";
+      }
+      objects.push(obj);
+    }
+
+    return { headers, rows: objects };
+  }
+
+  private generateHeaders(length: number): string[] {
+    const headers: string[] = [];
+    for (let i = 0; i < length; i += 1) {
+      headers.push(`col${i}`);
+    }
+    return headers;
+  }
+}
+
+