Fix bug with parallel nested sql expressions (#8)

* add regression test

* complexify test

* fix bug

* remove count in SqlContainer

sql.js

@@ -10,11 +10,12 @@ const sqlText = (count, chains, expressions) => {
       text += chains[i + 1]
     } else if (expression && expression._sql instanceof SqlContainer) {
       // if expression is a sub `sql` template literal
-      const { text: _text, values: _values } = sqlText(
+      const { text: _text, values: _values, count: _count } = sqlText(
         count,
         expression._sql.chains,
         expression._sql.expressions
       )
+      count = _count
       text += _text + chains[i + 1]
       values.push(..._values)
     } else {
@@ -28,11 +29,15 @@ const sqlText = (count, chains, expressions) => {
   return {
     _sql: new SqlContainer(chains, expressions),
     text,
-    values
+    values,
+    count
   }
 }
 
-const sql = (chains, ...expressions) => sqlText(1, chains, expressions)
+const sql = (chains, ...expressions) => {
+  const { _sql, text, values } = sqlText(1, chains, expressions)
+  return { _sql, text, values }
+}
 
 class SqlContainer {
   constructor(chains, expressions) {

test/sql.test.js

@@ -77,6 +77,23 @@ test('imbricated sql tags (2 levels)', () => {
   expect(query.values[2]).toBe(expr2)
 })
 
+test('imbricated sql tags (parallel)', () => {
+  const [expr0, expr1, expr2, expr3, expr4] = ['i', 'like', 'sql', 'a', 'lot']
+  const query = sql`
+    level 0 ${expr0}
+    ${sql`a ${expr1} ${expr2}`}
+    ${sql`b ${expr3} ${expr4}`}
+  `
+
+  expect(trimSpaces(query.text)).toBe('level 0 $1 a $2 $3 b $4 $5')
+  expect(query.values).toHaveLength(5)
+  expect(query.values[0]).toBe(expr0)
+  expect(query.values[1]).toBe(expr1)
+  expect(query.values[2]).toBe(expr2)
+  expect(query.values[3]).toBe(expr3)
+  expect(query.values[4]).toBe(expr4)
+})
+
 test('json as query parameter', () => {
   const jsonValue = { _sql: { some: 'data' }, item: 'value' }
   const query = sql`select obj from movies where obj = ${jsonValue}`