Fix trailing MSSQL GO batch separators

CHANGELOG.md

@@ -11,6 +11,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Kept `@pondpilot/flowscope-react` as a private monorepo workspace and removed it from the npm release pipeline
 
+### Fixed
+
+#### Core Engine (flowscope-core)
+
+- **MSSQL `GO` batch separators** - treat standalone SQL Server batch separators as statement boundaries during analysis and statement splitting, including trailing separators and CRLF input.
+
 ## [0.9.0] - 2026-08-12
 
 ### Added

crates/flowscope-core/src/analyzer/input.rs

@@ -653,13 +653,14 @@ fn split_ranges_on_mssql_go_separators(sql: &str, ranges: Vec<Range<usize>>) ->
     for range in ranges {
         let mut cursor = range.start;
         for go_range in &go_line_ranges {
-            if go_range.start < range.start || go_range.end > range.end || go_range.start < cursor {
+            if go_range.end <= cursor || go_range.start >= range.end {
                 continue;
             }
-            if let Some(chunk) = trim_statement_range(sql, cursor, go_range.start) {
+            let separator_start = go_range.start.max(cursor);
+            if let Some(chunk) = trim_statement_range(sql, cursor, separator_start) {
                 out.push(chunk);
             }
-            cursor = go_range.end;
+            cursor = go_range.end.min(range.end);
         }
 
         if let Some(chunk) = trim_statement_range(sql, cursor, range.end) {
@@ -1212,6 +1213,31 @@ mod tests {
         assert_eq!(&sql[ranges[1].clone()], "CREATE TABLE test (id INT)");
     }
 
+    #[test]
+    fn mssql_statement_ranges_split_trailing_go_batch_separators() {
+        for sql in [
+            "SELECT 1;\nGO\nSELECT 2;\nGO\n",
+            "SELECT 1;\r\n  go  \r\nSELECT 2;\r\nGO\r\n",
+            "SELECT 1\nGO\nGO\nSELECT 2\nGO\n",
+        ] {
+            let ranges = compute_statement_ranges_for_dialect(sql, Dialect::Mssql);
+            assert_eq!(ranges.len(), 2, "unexpected ranges for {sql:?}");
+            assert_eq!(&sql[ranges[0].clone()], "SELECT 1");
+            assert_eq!(&sql[ranges[1].clone()], "SELECT 2");
+        }
+    }
+
+    #[test]
+    fn mssql_statement_ranges_ignore_go_inside_strings_comments_and_identifiers() {
+        let sql = "SELECT 'GO' AS literal;\nSELECT [GO] FROM [source];\n-- GO\n/* GO */\nGO\nSELECT 'inside\nGO\nstring' AS literal;";
+        let ranges = compute_statement_ranges_for_dialect(sql, Dialect::Mssql);
+
+        assert_eq!(ranges.len(), 3);
+        assert_eq!(&sql[ranges[0].clone()], "SELECT 'GO' AS literal");
+        assert_eq!(&sql[ranges[1].clone()], "SELECT [GO] FROM [source]");
+        assert!(sql[ranges[2].clone()].contains("inside\nGO\nstring"));
+    }
+
     #[test]
     fn collect_statements_mssql_go_batch_without_final_semicolon_parses_statements() {
         let mut request = base_request();
@@ -1226,6 +1252,21 @@ mod tests {
         assert_eq!(statements.len(), 2);
     }
 
+    #[test]
+    fn collect_statements_mssql_go_batch_with_trailing_separator_has_no_parse_error() {
+        let mut request = base_request();
+        request.dialect = Dialect::Mssql;
+        request.sql = "SELECT 1;\nGO\nSELECT 2;\nGO\n".to_string();
+
+        let (statements, issues) = collect_statements(&request);
+
+        assert_eq!(statements.len(), 2);
+        assert!(
+            issues.is_empty(),
+            "MSSQL trailing GO should not produce parse errors: {issues:?}"
+        );
+    }
+
     #[test]
     fn parses_procedure_with_inner_semicolons() {
         let mut request = base_request();

crates/flowscope-wasm/tests/analysis.rs

@@ -0,0 +1,48 @@
+use flowscope_wasm::{analyze_sql_json, split_statements_json};
+use serde_json::Value;
+
+#[test]
+fn analyze_sql_json_handles_mssql_go_batch_separators() {
+    let request = serde_json::json!({
+        "sql": "SELECT 1;\nGO\nSELECT 2;\nGO\n",
+        "dialect": "mssql"
+    });
+
+    let result: Value = serde_json::from_str(&analyze_sql_json(&request.to_string()))
+        .expect("analysis result should be valid JSON");
+    let statements = result
+        .get("statements")
+        .and_then(Value::as_array)
+        .expect("analysis result should contain statements");
+    let issues = result
+        .get("issues")
+        .and_then(Value::as_array)
+        .expect("analysis result should contain issues");
+
+    assert_eq!(statements.len(), 2);
+    assert!(!issues
+        .iter()
+        .any(|issue| { issue.get("code") == Some(&Value::String("PARSE_ERROR".to_string())) }));
+}
+
+#[test]
+fn split_statements_json_handles_mssql_go_batch_separators() {
+    let sql = "SELECT 1;\nGO\nSELECT 2;\nGO\n";
+    let request = serde_json::json!({
+        "sql": sql,
+        "dialect": "mssql"
+    });
+
+    let result: Value = serde_json::from_str(&split_statements_json(&request.to_string()))
+        .expect("statement split result should be valid JSON");
+    let statements = result
+        .get("statements")
+        .and_then(Value::as_array)
+        .expect("statement split result should contain statements");
+
+    assert_eq!(statements.len(), 2);
+    assert_eq!(statements[0]["start"], 0);
+    assert_eq!(statements[0]["end"], 8);
+    assert_eq!(statements[1]["start"], 13);
+    assert_eq!(statements[1]["end"], 21);
+}

scripts/test_wasm_browser.mjs

@@ -43,6 +43,15 @@ const harness = `<!doctype html>
         .map((node) => node.label);
       const errors = result.issues.filter((issue) => issue.severity === 'error');
 
+      const mssqlRequest = {
+        sql: 'SELECT 1;\nGO\nSELECT 2;\nGO\n',
+        dialect: 'mssql',
+      };
+      const mssqlResult = JSON.parse(analyze_sql_json(JSON.stringify(mssqlRequest)));
+      const mssqlParseErrors = mssqlResult.issues.filter(
+        (issue) => issue.code === 'PARSE_ERROR'
+      );
+
       if (result.statements.length !== 1 || result.summary.statementCount !== 1) {
         throw new Error('Expected one analyzed statement');
       }
@@ -52,12 +61,18 @@ const harness = `<!doctype html>
       if (errors.length > 0) {
         throw new Error('Analysis returned errors: ' + JSON.stringify(errors));
       }
+      if (mssqlResult.statements.length !== 2 || mssqlParseErrors.length > 0) {
+        throw new Error(
+          'MSSQL GO batch analysis failed: ' + JSON.stringify(mssqlResult.issues)
+        );
+      }
 
       body.dataset.status = 'passed';
       body.textContent = JSON.stringify({
         version: get_version(),
         statementCount: result.summary.statementCount,
-        tableLabels
+        tableLabels,
+        mssqlStatementCount: mssqlResult.summary.statementCount,
       });
     } catch (error) {
       body.dataset.status = 'failed';