Fix obscure lexer corner case (#75)

* Fix obscure lexer corner case

* Test keep-space for obscure corner case

* 0.2.5

* Bump mo-fmt dependency

package.json

@@ -1,6 +1,6 @@
 {
     "name": "prettier-plugin-motoko",
-    "version": "0.2.4",
+    "version": "0.2.5",
     "description": "A code formatter for the Motoko smart contract language.",
     "main": "lib/environments/node.js",
     "browser": "lib/environments/web.js",

packages/mo-fmt/package.json

@@ -1,6 +1,6 @@
 {
     "name": "mo-fmt",
-    "version": "0.2.4",
+    "version": "0.2.5",
     "description": "An easy-to-use Motoko formatter command.",
     "main": "src/cli.js",
     "bin": {
@@ -21,7 +21,7 @@
         "commander": "^9.4.0",
         "fast-glob": "^3.2.11",
         "prettier": "^2.7",
-        "prettier-plugin-motoko": "^0.2.4"
+        "prettier-plugin-motoko": "^0.2.5"
     },
     "devDependencies": {
         "@rollup/plugin-commonjs": "^22.0.2",

src/printers/motoko-tt-ast/spaceConfig.ts

@@ -163,6 +163,17 @@ const spaceConfig: SpaceConfig = {
         ['Open', '_', 'nil'],
         ['_', 'Close', 'nil'],
 
+        // identifier after float in exponential notation (fixes #74)
+        [
+            token(
+                (token) =>
+                    token.token_type === 'Literal' &&
+                    /\.[a-z]/i.test(token.data[0]),
+            ),
+            'Ident',
+            'keep',
+        ],
+
         // default
         ['_', '_', 'space'],
     ],

tests/formatter.test.ts

@@ -247,6 +247,11 @@ describe('Motoko formatter', () => {
     //     );
     // });
 
+    test('identifier tokens', ()=>{
+        expect(format('x.0.e0x')).toStrictEqual('x.0.e0x\n');
+        expect(format('x.0.e0 x')).toStrictEqual('x.0.e0 x\n');
+    })
+
     test('array indexing line break', () => {
         expect(format(`${'x'.repeat(80)}[0]`)).toStrictEqual(
             `${'x'.repeat(80)}[0];\n`,