Parse expressions like '1._foo()' after dot as references

compiler/frontend/src/org/jetbrains/kotlin/lexer/Kotlin.flex

@@ -100,7 +100,7 @@ LONG_SUFFIX=[Ll]
 //FLOAT_LITERAL=(({FLOATING_POINT_LITERAL1})[Ff])|(({FLOATING_POINT_LITERAL2})[Ff])|(({FLOATING_POINT_LITERAL3})[Ff])|(({FLOATING_POINT_LITERAL4})[Ff])
 //DOUBLE_LITERAL=(({FLOATING_POINT_LITERAL1})[Dd]?)|(({FLOATING_POINT_LITERAL2})[Dd]?)|(({FLOATING_POINT_LITERAL3})[Dd]?)|(({FLOATING_POINT_LITERAL4})[Dd])
 DOUBLE_LITERAL={FLOATING_POINT_LITERAL1}|{FLOATING_POINT_LITERAL2}|{FLOATING_POINT_LITERAL3}|{FLOATING_POINT_LITERAL4}
-FLOATING_POINT_LITERAL1=({DIGITS})"."({DIGIT_OR_UNDERSCORE})+({EXPONENT_PART})?({FLOATING_POINT_LITERAL_SUFFIX})?
+FLOATING_POINT_LITERAL1=({DIGITS})"."({DIGITS})+({EXPONENT_PART})?({FLOATING_POINT_LITERAL_SUFFIX})?
 FLOATING_POINT_LITERAL2="."({DIGITS})({EXPONENT_PART})?({FLOATING_POINT_LITERAL_SUFFIX})?
 FLOATING_POINT_LITERAL3=({DIGITS})({EXPONENT_PART})({FLOATING_POINT_LITERAL_SUFFIX})?
 FLOATING_POINT_LITERAL4=({DIGITS})({FLOATING_POINT_LITERAL_SUFFIX})

compiler/frontend/src/org/jetbrains/kotlin/lexer/_JetLexer.java

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2010-2016 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 /* The following code was generated by JFlex 1.7.0-SNAPSHOT tweaked for IntelliJ platform */
 
 package org.jetbrains.kotlin.lexer;
@@ -347,7 +363,7 @@ class _JetLexer implements FlexLexer {
     "\4\76\4\0\21\76\20\0\7\206\2\0\72\206\1\0"+
     "\3\76\1\0\2\76\6\0\4\76\1\0\2\76\3\0"+
     "\1\76\2\0\1\76\1\207\2\76\4\0\21\76\57\0"+
-    "\1\210\55\0\1\211\111\0\1\212\62\0\2\126\12\0"+
+    "\1\210\55\0\1\211\111\0\1\212\62\0\1\126\13\0"+
     "\1\126\3\0\1\213\62\0\2\214\12\0\1\214\4\0"+
     "\1\110\1\0\1\214\24\0\1\110\13\0\1\214\15\0"+
     "\7\112\1\215\1\0\72\112\1\0\3\113\1\0\2\113"+
@@ -411,7 +427,7 @@ class _JetLexer implements FlexLexer {
     "\62\0\2\214\12\0\1\214\4\0\1\110\26\0\1\110"+
     "\31\0\7\216\1\263\1\0\72\216\12\0\1\264\71\0"+
     "\3\265\1\0\2\265\6\0\4\265\1\0\2\265\3\0"+
-    "\1\265\2\0\4\265\4\0\21\265\21\0\2\126\12\0"+
+    "\1\265\2\0\4\265\4\0\21\265\21\0\1\126\13\0"+
     "\1\126\66\0\3\11\1\0\2\11\6\0\4\11\1\0"+
     "\2\11\3\0\1\11\2\0\3\11\1\266\4\0\21\11"+
     "\21\0\3\11\1\0\2\11\6\0\4\11\1\0\2\11"+

compiler/testData/diagnostics/tests/underscoresInNumericLiterals/illegalUnderscores.kt

@@ -8,8 +8,6 @@ fun foo() {
     <!ILLEGAL_UNDERSCORE!>0B_1<!>
     <!ILLEGAL_UNDERSCORE!>1.0_<!>
     <!ILLEGAL_UNDERSCORE!>1_.1<!>
-    <!ILLEGAL_UNDERSCORE!>1._1<!>
-    <!ILLEGAL_UNDERSCORE!>1_._1<!>
     <!ILLEGAL_UNDERSCORE!>1.0_e1<!>
     <!ILLEGAL_UNDERSCORE!>1.0E_1<!>
     <!ILLEGAL_UNDERSCORE!>0Xe_<!>

compiler/testData/diagnostics/tests/underscoresInNumericLiterals/noUnderscores.kt

@@ -4,7 +4,6 @@
 fun foo() {
     <!UNSUPPORTED_FEATURE!>100_1<!>
     <!UNSUPPORTED_FEATURE!>3_.1<!>
-    <!UNSUPPORTED_FEATURE!>3_._1<!>
     <!UNSUPPORTED_FEATURE!>2___4<!>
     <!UNSUPPORTED_FEATURE!>123_<!>
 }

compiler/testData/psi/FunctionCalls.kt

@@ -32,4 +32,9 @@ fun foo() {
   v(fred<a, *, b>(a))
   w(plugh<a, "", b>(a))
   xyzzy<*>()
+  1._foo()
+  1.__foo()
+  1_1._foo()
+  1._1foo()
+  1._1_foo()
 }

compiler/testData/psi/FunctionCalls.txt

@@ -495,5 +495,60 @@ JetFile: FunctionCalls.kt
         VALUE_ARGUMENT_LIST
           PsiElement(LPAR)('(')
           PsiElement(RPAR)(')')
+      PsiWhiteSpace('\n  ')
+      DOT_QUALIFIED_EXPRESSION
+        INTEGER_CONSTANT
+          PsiElement(INTEGER_LITERAL)('1')
+        PsiElement(DOT)('.')
+        CALL_EXPRESSION
+          REFERENCE_EXPRESSION
+            PsiElement(IDENTIFIER)('_foo')
+          VALUE_ARGUMENT_LIST
+            PsiElement(LPAR)('(')
+            PsiElement(RPAR)(')')
+      PsiWhiteSpace('\n  ')
+      DOT_QUALIFIED_EXPRESSION
+        INTEGER_CONSTANT
+          PsiElement(INTEGER_LITERAL)('1')
+        PsiElement(DOT)('.')
+        CALL_EXPRESSION
+          REFERENCE_EXPRESSION
+            PsiElement(IDENTIFIER)('__foo')
+          VALUE_ARGUMENT_LIST
+            PsiElement(LPAR)('(')
+            PsiElement(RPAR)(')')
+      PsiWhiteSpace('\n  ')
+      DOT_QUALIFIED_EXPRESSION
+        INTEGER_CONSTANT
+          PsiElement(INTEGER_LITERAL)('1_1')
+        PsiElement(DOT)('.')
+        CALL_EXPRESSION
+          REFERENCE_EXPRESSION
+            PsiElement(IDENTIFIER)('_foo')
+          VALUE_ARGUMENT_LIST
+            PsiElement(LPAR)('(')
+            PsiElement(RPAR)(')')
+      PsiWhiteSpace('\n  ')
+      DOT_QUALIFIED_EXPRESSION
+        INTEGER_CONSTANT
+          PsiElement(INTEGER_LITERAL)('1')
+        PsiElement(DOT)('.')
+        CALL_EXPRESSION
+          REFERENCE_EXPRESSION
+            PsiElement(IDENTIFIER)('_1foo')
+          VALUE_ARGUMENT_LIST
+            PsiElement(LPAR)('(')
+            PsiElement(RPAR)(')')
+      PsiWhiteSpace('\n  ')
+      DOT_QUALIFIED_EXPRESSION
+        INTEGER_CONSTANT
+          PsiElement(INTEGER_LITERAL)('1')
+        PsiElement(DOT)('.')
+        CALL_EXPRESSION
+          REFERENCE_EXPRESSION
+            PsiElement(IDENTIFIER)('_1_foo')
+          VALUE_ARGUMENT_LIST
+            PsiElement(LPAR)('(')
+            PsiElement(RPAR)(')')
       PsiWhiteSpace('\n')
-      PsiElement(RBRACE)('}')
+      PsiElement(RBRACE)('}')

compiler/testData/psi/PropertyInvokes.kt

@@ -0,0 +1,7 @@
+fun foo() {
+    1._some
+    1.__some
+    1_1._some
+    1._1some
+    1._1_some
+}

compiler/testData/psi/PropertyInvokes.txt

@@ -0,0 +1,52 @@
+JetFile: PropertyInvokes.kt
+  PACKAGE_DIRECTIVE
+    <empty list>
+  IMPORT_LIST
+    <empty list>
+  FUN
+    PsiElement(fun)('fun')
+    PsiWhiteSpace(' ')
+    PsiElement(IDENTIFIER)('foo')
+    VALUE_PARAMETER_LIST
+      PsiElement(LPAR)('(')
+      PsiElement(RPAR)(')')
+    PsiWhiteSpace(' ')
+    BLOCK
+      PsiElement(LBRACE)('{')
+      PsiWhiteSpace('\n    ')
+      DOT_QUALIFIED_EXPRESSION
+        INTEGER_CONSTANT
+          PsiElement(INTEGER_LITERAL)('1')
+        PsiElement(DOT)('.')
+        REFERENCE_EXPRESSION
+          PsiElement(IDENTIFIER)('_some')
+      PsiWhiteSpace('\n    ')
+      DOT_QUALIFIED_EXPRESSION
+        INTEGER_CONSTANT
+          PsiElement(INTEGER_LITERAL)('1')
+        PsiElement(DOT)('.')
+        REFERENCE_EXPRESSION
+          PsiElement(IDENTIFIER)('__some')
+      PsiWhiteSpace('\n    ')
+      DOT_QUALIFIED_EXPRESSION
+        INTEGER_CONSTANT
+          PsiElement(INTEGER_LITERAL)('1_1')
+        PsiElement(DOT)('.')
+        REFERENCE_EXPRESSION
+          PsiElement(IDENTIFIER)('_some')
+      PsiWhiteSpace('\n    ')
+      DOT_QUALIFIED_EXPRESSION
+        INTEGER_CONSTANT
+          PsiElement(INTEGER_LITERAL)('1')
+        PsiElement(DOT)('.')
+        REFERENCE_EXPRESSION
+          PsiElement(IDENTIFIER)('_1some')
+      PsiWhiteSpace('\n    ')
+      DOT_QUALIFIED_EXPRESSION
+        INTEGER_CONSTANT
+          PsiElement(INTEGER_LITERAL)('1')
+        PsiElement(DOT)('.')
+        REFERENCE_EXPRESSION
+          PsiElement(IDENTIFIER)('_1_some')
+      PsiWhiteSpace('\n')
+      PsiElement(RBRACE)('}')

compiler/tests/org/jetbrains/kotlin/parsing/ParsingTestGenerated.java

@@ -680,6 +680,12 @@ public class ParsingTestGenerated extends AbstractParsingTest {
             doParsingTest(fileName);
         }
 
+        @TestMetadata("PropertyInvokes.kt")
+        public void testPropertyInvokes() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/psi/PropertyInvokes.kt");
+            doParsingTest(fileName);
+        }
+
         @TestMetadata("QuotedIdentifiers.kt")
         public void testQuotedIdentifiers() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/psi/QuotedIdentifiers.kt");