500 lines
16 KiB
TypeScript
500 lines
16 KiB
TypeScript
import { findActiveSqlStatementSpan, tokenizeSqlSemantic, tokenIsIdentifier, unquoteSqlSemanticIdentifier } from "@/lib/sql/semantic/tokens";
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import type { SqlSemanticSpan, SqlSemanticToken } from "@/lib/sql/semantic/types";
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export interface InsertValueHint {
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/** Document offset where the inlay widget is inserted (before the value expression). */
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from: number;
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column: string;
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}
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export interface InsertValuesClause {
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table: string;
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schema?: string;
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/** Catalog/database qualifier for three-part names like OtherDb.dbo.Users. */
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database?: string;
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/** Explicit column list, or null when `INSERT INTO t VALUES` has no column list. */
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columns: string[] | null;
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/** For each VALUES row, start offsets of top-level value expressions. */
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rows: number[][];
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span: SqlSemanticSpan;
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}
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export interface ParseInsertValueHintsOptions {
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/** Resolve table columns when the INSERT has no explicit column list. */
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resolveTableColumns?: (table: string, schema?: string, database?: string) => string[] | undefined;
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}
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export interface TextRange {
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from: number;
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to: number;
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}
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function significantTokens(tokens: readonly SqlSemanticToken[]): SqlSemanticToken[] {
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return tokens.filter((item) => item.kind !== "comment");
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}
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function statementSpans(sql: string, tokens: readonly SqlSemanticToken[]): SqlSemanticSpan[] {
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const spans: SqlSemanticSpan[] = [];
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let start = 0;
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for (const item of tokens) {
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if (item.kind !== "punctuation" || item.text !== ";" || item.depth !== 0) continue;
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const span = trimSpan(sql, start, item.span.start);
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if (span.end > span.start) spans.push(span);
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start = item.span.end;
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}
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const last = trimSpan(sql, start, sql.length);
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if (last.end > last.start) spans.push(last);
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return spans;
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}
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function trimSpan(sql: string, start: number, end: number): SqlSemanticSpan {
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let from = start;
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let to = end;
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while (from < to && /\s/.test(sql[from] ?? "")) from += 1;
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while (to > from && /\s/.test(sql[to - 1] ?? "")) to -= 1;
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return { start: from, end: to };
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}
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function tokensInSpan(tokens: readonly SqlSemanticToken[], span: SqlSemanticSpan): SqlSemanticToken[] {
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return tokens.filter((item) => item.span.end > span.start && item.span.start < span.end);
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}
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function findWordIndex(tokens: readonly SqlSemanticToken[], word: string, from = 0): number {
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const needle = word.toLowerCase();
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for (let index = from; index < tokens.length; index += 1) {
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const item = tokens[index];
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if (item?.kind === "word" && item.normalized === needle) return index;
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}
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return -1;
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}
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export function readQualifiedName(tokens: readonly SqlSemanticToken[], startIndex: number): { name: string; schema?: string; database?: string; nextIndex: number } | null {
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const first = tokens[startIndex];
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if (!tokenIsIdentifier(first)) return null;
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const parts = [unquoteSqlSemanticIdentifier(first)];
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let index = startIndex + 1;
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while (tokens[index]?.text === "." && tokenIsIdentifier(tokens[index + 1])) {
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parts.push(unquoteSqlSemanticIdentifier(tokens[index + 1]!));
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index += 2;
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}
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if (parts.length >= 3) {
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return {
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database: parts[parts.length - 3],
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schema: parts[parts.length - 2],
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name: parts[parts.length - 1]!,
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nextIndex: index,
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};
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}
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if (parts.length === 2) {
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return { schema: parts[0], name: parts[1]!, nextIndex: index };
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}
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return { name: parts[0]!, nextIndex: index };
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}
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function parseColumnList(tokens: readonly SqlSemanticToken[], openIndex: number): { columns: string[]; nextIndex: number } | null {
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const open = tokens[openIndex];
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if (!open || open.text !== "(") return null;
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const columns: string[] = [];
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let index = openIndex + 1;
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while (index < tokens.length) {
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const item = tokens[index];
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if (!item) break;
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if (item.text === ")" && item.depth === open.depth) {
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return { columns, nextIndex: index + 1 };
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}
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if (tokenIsIdentifier(item) && item.depth === open.depth + 1) {
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columns.push(unquoteSqlSemanticIdentifier(item));
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index += 1;
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continue;
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}
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index += 1;
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}
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return { columns, nextIndex: index };
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}
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function valueStartsInRow(tokens: readonly SqlSemanticToken[], openIndex: number): { starts: number[]; nextIndex: number } | null {
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const open = tokens[openIndex];
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if (!open || open.text !== "(") return null;
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const contentDepth = open.depth + 1;
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const starts: number[] = [];
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let expectValue = true;
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let index = openIndex + 1;
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while (index < tokens.length) {
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const item = tokens[index];
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if (!item) break;
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if (item.text === ")" && item.depth === open.depth) {
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return { starts, nextIndex: index + 1 };
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}
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if (expectValue && item.depth === contentDepth) {
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starts.push(item.span.start);
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expectValue = false;
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}
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if (item.text === "," && item.depth === contentDepth) {
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expectValue = true;
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}
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index += 1;
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}
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return { starts, nextIndex: index };
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}
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function parseValuesRows(tokens: readonly SqlSemanticToken[], valuesIndex: number): number[][] {
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const rows: number[][] = [];
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let index = valuesIndex + 1;
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while (index < tokens.length) {
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const item = tokens[index];
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if (!item) break;
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if (item.kind === "word" && (item.normalized === "returning" || item.normalized === "on" || item.normalized === "select")) break;
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if (item.text === "(") {
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const row = valueStartsInRow(tokens, index);
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if (!row) break;
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if (row.starts.length > 0) rows.push(row.starts);
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index = row.nextIndex;
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continue;
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}
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if (item.text === ",") {
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index += 1;
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continue;
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}
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break;
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}
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return rows;
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}
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function parseInsertClause(tokens: readonly SqlSemanticToken[], span: SqlSemanticSpan): InsertValuesClause | null {
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const insertIndex = findWordIndex(tokens, "insert");
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if (insertIndex < 0) return null;
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const intoIndex = findWordIndex(tokens, "into", insertIndex + 1);
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if (intoIndex < 0) return null;
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const tableInfo = readQualifiedName(tokens, intoIndex + 1);
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if (!tableInfo) return null;
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let index = tableInfo.nextIndex;
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let columns: string[] | null = null;
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// SQL Server table hints appear between the target table and INSERT column list.
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if (tokens[index]?.normalized === "with" && tokens[index + 1]?.text === "(") {
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const hintList = parseColumnList(tokens, index + 1);
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if (!hintList) return null;
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index = hintList.nextIndex;
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}
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// Optional alias between table and column list / VALUES / SELECT
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if (tokenIsIdentifier(tokens[index]) && tokens[index]?.normalized !== "values" && tokens[index]?.normalized !== "select" && tokens[index]?.normalized !== "default") {
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const maybeAs = tokens[index];
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if (maybeAs?.normalized === "as" && tokenIsIdentifier(tokens[index + 1])) {
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index += 2;
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} else if (tokens[index]?.text !== "(") {
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index += 1;
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}
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}
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if (tokens[index]?.text === "(") {
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const columnList = parseColumnList(tokens, index);
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if (!columnList) return null;
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columns = columnList.columns;
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index = columnList.nextIndex;
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}
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const valuesIndex = findWordIndex(tokens, "values", index);
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const selectIndex = findWordIndex(tokens, "select", index);
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if (valuesIndex < 0) return null;
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if (selectIndex >= 0 && selectIndex < valuesIndex) return null;
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const rows = parseValuesRows(tokens, valuesIndex);
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if (rows.length === 0) return null;
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return {
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table: tableInfo.name,
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schema: tableInfo.schema,
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database: tableInfo.database,
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columns,
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rows,
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span,
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};
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}
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function shiftClause(clause: InsertValuesClause, offset: number): InsertValuesClause {
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if (offset === 0) return clause;
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return {
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...clause,
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span: { start: clause.span.start + offset, end: clause.span.end + offset },
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rows: clause.rows.map((row) => row.map((from) => from + offset)),
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};
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}
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/**
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* Expand [from, to) to the nearest top-level statement window (quote/comment aware).
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* Scans at most LOOKBACK bytes before `from` and LOOKAHEAD after `to` so large scripts
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* do not pay O(document) on every keystroke.
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*/
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const STATEMENT_LOOKBACK = 32 * 1024;
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const STATEMENT_LOOKAHEAD = 32 * 1024;
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export function expandToSqlStatementWindow(sql: string, from: number, to: number): TextRange {
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const safeFrom = Math.max(0, Math.min(from, sql.length));
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const safeTo = Math.max(safeFrom, Math.min(to, sql.length));
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const scanFrom = Math.max(0, safeFrom - STATEMENT_LOOKBACK);
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const scanTo = Math.min(sql.length, safeTo + STATEMENT_LOOKAHEAD);
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const slice = scanFrom === 0 && scanTo === sql.length ? sql : sql.slice(scanFrom, scanTo);
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const localFrom = safeFrom - scanFrom;
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const localTo = safeTo - scanFrom;
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const start = findStatementStart(slice, localFrom) + scanFrom;
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const end = findStatementEnd(slice, Math.max(localFrom, localTo)) + scanFrom;
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const trimmed = trimSpan(sql, start, Math.min(end, scanTo));
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return { from: trimmed.start, to: trimmed.end };
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}
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function findStatementStart(sql: string, pos: number): number {
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let index = 0;
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let start = 0;
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let depth = 0;
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let inLineComment = false;
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let inBlockComment = false;
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let quote: string | null = null;
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while (index < pos) {
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const ch = sql[index] ?? "";
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const next = sql[index + 1] ?? "";
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if (inLineComment) {
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if (ch === "\n") inLineComment = false;
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index += 1;
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continue;
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}
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if (inBlockComment) {
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if (ch === "*" && next === "/") {
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inBlockComment = false;
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index += 2;
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continue;
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}
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index += 1;
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continue;
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}
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if (quote) {
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if (ch === quote) {
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if (next === quote) {
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index += 2;
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continue;
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}
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quote = null;
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}
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index += 1;
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continue;
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}
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if (ch === "-" && next === "-") {
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inLineComment = true;
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index += 2;
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continue;
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}
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if (ch === "#") {
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inLineComment = true;
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index += 1;
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continue;
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}
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if (ch === "/" && next === "*") {
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inBlockComment = true;
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index += 2;
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continue;
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}
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if (ch === "'" || ch === '"' || ch === "`") {
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quote = ch;
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index += 1;
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continue;
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}
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if (ch === "[") {
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quote = "]";
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index += 1;
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continue;
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}
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if (ch === "(") {
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depth += 1;
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index += 1;
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continue;
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}
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if (ch === ")") {
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depth = Math.max(0, depth - 1);
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index += 1;
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continue;
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}
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if (ch === ";" && depth === 0) {
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start = index + 1;
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index += 1;
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continue;
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}
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index += 1;
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}
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return start;
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}
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function findStatementEnd(sql: string, pos: number): number {
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let index = pos;
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let depth = 0;
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let inLineComment = false;
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let inBlockComment = false;
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let quote: string | null = null;
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while (index < sql.length) {
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const ch = sql[index] ?? "";
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const next = sql[index + 1] ?? "";
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if (inLineComment) {
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if (ch === "\n") inLineComment = false;
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index += 1;
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continue;
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}
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if (inBlockComment) {
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if (ch === "*" && next === "/") {
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inBlockComment = false;
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index += 2;
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continue;
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}
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index += 1;
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continue;
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}
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if (quote) {
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if ((quote === "]" && ch === "]") || (quote !== "]" && ch === quote)) {
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if (next === (quote === "]" ? "]" : quote)) {
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index += 2;
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continue;
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}
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quote = null;
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}
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index += 1;
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continue;
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}
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if (ch === "-" && next === "-") {
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inLineComment = true;
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index += 2;
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continue;
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}
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if (ch === "#") {
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inLineComment = true;
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index += 1;
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continue;
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}
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if (ch === "/" && next === "*") {
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inBlockComment = true;
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index += 2;
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continue;
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}
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if (ch === "'" || ch === '"' || ch === "`") {
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quote = ch;
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index += 1;
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continue;
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}
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if (ch === "[") {
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quote = "]";
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index += 1;
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continue;
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}
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if (ch === "(") {
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depth += 1;
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index += 1;
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continue;
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}
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if (ch === ")") {
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depth = Math.max(0, depth - 1);
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index += 1;
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continue;
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}
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if (ch === ";" && depth === 0) {
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return index;
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}
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index += 1;
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}
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return sql.length;
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}
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function mergeTextRanges(ranges: readonly TextRange[]): TextRange[] {
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if (ranges.length === 0) return [];
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const sorted = [...ranges].sort((a, b) => a.from - b.from || a.to - b.to);
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const merged: TextRange[] = [{ ...sorted[0]! }];
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for (let index = 1; index < sorted.length; index += 1) {
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const current = sorted[index]!;
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const last = merged[merged.length - 1]!;
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if (current.from <= last.to) {
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last.to = Math.max(last.to, current.to);
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} else {
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merged.push({ ...current });
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}
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}
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return merged;
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}
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/** Parse INSERT ... VALUES clauses only inside the given document ranges (expanded to statement windows). */
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export function parseInsertValuesClausesInRanges(sql: string, ranges: readonly TextRange[]): InsertValuesClause[] {
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if (!sql.trim() || ranges.length === 0) return [];
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const windows = mergeTextRanges(ranges.map((range) => expandToSqlStatementWindow(sql, range.from, range.to)));
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const clauses: InsertValuesClause[] = [];
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for (const window of windows) {
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if (window.to <= window.from) continue;
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const slice = sql.slice(window.from, window.to);
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for (const clause of parseInsertValuesClauses(slice)) {
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clauses.push(shiftClause(clause, window.from));
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}
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}
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return clauses;
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}
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/** Parse all INSERT ... VALUES clauses in `sql` (multi-statement aware). Prefer ranged parsing for editors. */
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export function parseInsertValuesClauses(sql: string): InsertValuesClause[] {
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if (!sql.trim()) return [];
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const allTokens = tokenizeSqlSemantic(sql);
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const spans = statementSpans(sql, allTokens);
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const clauses: InsertValuesClause[] = [];
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for (const span of spans) {
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const tokens = significantTokens(tokensInSpan(allTokens, span));
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const clause = parseInsertClause(tokens, span);
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if (clause) clauses.push(clause);
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}
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return clauses;
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}
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/** Build inlay hint positions from parsed clauses and optional table-column resolver. */
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export function buildInsertValueHints(clauses: readonly InsertValuesClause[], options: ParseInsertValueHintsOptions = {}): InsertValueHint[] {
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const hints: InsertValueHint[] = [];
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for (const clause of clauses) {
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const columns = clause.columns ?? options.resolveTableColumns?.(clause.table, clause.schema, clause.database);
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if (!columns || columns.length === 0) continue;
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for (const row of clause.rows) {
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const count = Math.min(row.length, columns.length);
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for (let index = 0; index < count; index += 1) {
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const from = row[index];
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const column = columns[index];
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if (from === undefined || !column) continue;
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hints.push({ from, column });
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}
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}
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}
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return hints;
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}
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/** Parse SQL and return insert-value inlay hints. */
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export function parseInsertValueHints(sql: string, options: ParseInsertValueHintsOptions = {}): InsertValueHint[] {
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return buildInsertValueHints(parseInsertValuesClauses(sql), options);
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}
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/** Parse only the statements covering `ranges` and return insert-value inlay hints. */
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export function parseInsertValueHintsInRanges(sql: string, ranges: readonly TextRange[], options: ParseInsertValueHintsOptions = {}): InsertValueHint[] {
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return buildInsertValueHints(parseInsertValuesClausesInRanges(sql, ranges), options);
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}
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/** True when the document still needs table metadata for at least one INSERT without a column list. */
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export function insertValueHintsNeedTableColumns(sql: string): InsertValuesClause[] {
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return parseInsertValuesClauses(sql).filter((clause) => clause.columns === null);
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}
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/** Convenience: hints for the statement containing `cursor` only. */
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export function parseInsertValueHintsAtCursor(sql: string, cursor: number, options: ParseInsertValueHintsOptions = {}): InsertValueHint[] {
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const tokens = tokenizeSqlSemantic(sql);
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const span = findActiveSqlStatementSpan(sql, tokens, cursor);
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const statementTokens = significantTokens(tokensInSpan(tokens, span));
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const clause = parseInsertClause(statementTokens, span);
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if (!clause) return [];
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return buildInsertValueHints([clause], options);
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}
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