Support :name placeholders in PostgreSQL

Author: nene

src/languages/PostgreSqlFormatter.js

@@ -511,7 +511,7 @@ export default class PostgreSqlFormatter extends Formatter {
       openParens: ['(', 'CASE'],
       closeParens: [')', 'END'],
       indexedPlaceholderTypes: ['$'],
-      namedPlaceholderTypes: [],
+      namedPlaceholderTypes: [':'],
       lineCommentTypes: ['--'],
       operators: [
         '!=',

test/PostgreSqlFormatterTest.js

@@ -49,7 +49,7 @@ describe('PostgreSqlFormatter', () => {
   ]);
   supportsJoin(format);
 
-  it('supports $placeholders', () => {
+  it('supports $n placeholders', () => {
     const result = format('SELECT $1, $2 FROM tbl');
     expect(result).toBe(dedent`
       SELECT
@@ -60,7 +60,7 @@ describe('PostgreSqlFormatter', () => {
     `);
   });
 
-  it('replaces $placeholders with param values', () => {
+  it('replaces $n placeholders with param values', () => {
     const result = format('SELECT $1, $2 FROM tbl', {
       params: { 1: '"variable value"', 2: '"blah"' },
     });
@@ -72,4 +72,20 @@ describe('PostgreSqlFormatter', () => {
         tbl
     `);
   });
+
+  it('supports :name placeholders', () => {
+    expect(format('foo = :bar')).toBe('foo = :bar');
+  });
+
+  it('replaces :name placeholders with param values', () => {
+    expect(
+      format(`foo = :bar AND :"field" = 10 OR col = :'val'`, {
+        params: { bar: "'Hello'", field: 'some_col', val: 7 },
+      })
+    ).toBe(dedent`
+      foo = 'Hello'
+      AND some_col = 10
+      OR col = 7
+    `);
+  });
 });