Added exponential notation support in number literals

Author: adamwojs

src/main/java/fr/adrienbrault/idea/symfony2plugin/expressionLanguage/ExpressionLanguage.bnf

@@ -15,7 +15,7 @@
   extends(".*expr")=expr
   tokens=[
     space='regexp:\s+'
-    number='regexp:\d+(\.\d*)?'
+    number='regexp:\d+(\.\d*)?([Ee][+\-]\d+)?'
     null="regexp:NULL|null"
     true="regexp:TRUE|true"
     false="regexp:FALSE|false"

src/main/java/fr/adrienbrault/idea/symfony2plugin/expressionLanguage/ExpressionLanguage.flex

@@ -26,7 +26,7 @@ EOL=\R
 WHITE_SPACE=\s+
 
 SPACE=[ \t\n\x0B\f\r]+
-NUMBER=[0-9]+(\.[0-9]*)?
+NUMBER=[0-9]+(\.[0-9]*)?([Ee][+\-][0-9]+)?
 NULL=NULL|null
 TRUE=TRUE|true
 FALSE=FALSE|false

src/test/java/fr/adrienbrault/idea/symfony2plugin/tests/expressionLanguage/ExpressionLanguageParsingTest.java

@@ -129,6 +129,10 @@ public void testNumberLiteralWithFraction() {
         doTest(true);
     }
 
+    public void testExponentialNotationLiteral() {
+        doTest(true);
+    }
+
     public void testStringDoubleQuoteLiteral() {
         doTest(true);
     }

src/test/java/fr/adrienbrault/idea/symfony2plugin/tests/expressionLanguage/testData/ExponentialNotationLiteral.test

@@ -0,0 +1 @@
+1.99E+3

src/test/java/fr/adrienbrault/idea/symfony2plugin/tests/expressionLanguage/testData/ExponentialNotationLiteral.txt

@@ -0,0 +1,3 @@
+Expression Language File
+  ExpressionLanguageLiteralExprImpl(LITERAL_EXPR)
+    PsiElement( ExpressionLanguageType.number)('1.99E+3')