Merge pull request #63 from willowtreeapps/feature/conditionalCompila…

…tion Support for Conditional Compilation
willowtreeapps · Feb 6, 2018 · d62291f · d62291f
2 parents 7752ae2 + 20043dd
commit d62291f
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Showing 2 changed files with 56 additions and 3 deletions.
diff --git a/grammar/BrightScript.g4 b/grammar/BrightScript.g4
@@ -5,11 +5,21 @@ startRule
     ;
 
 component
-    : endOfLine* libraryStatement* endOfLine* componentBody
+    : componentHead componentBody
+    ;
+
+componentHead
+    : endOfLine* componentHeadElement (endOfLine+ componentHeadElement)* endOfLine*
+    ;
+
+componentHeadElement
+    : libraryStatement
+    | conditionalCompilationStatement
+    | comment
     ;
 
 componentBody
-    : componentBodyElement (endOfLine+ componentBodyElement)* endOfLine*
+    : endOfLine* componentBodyElement (endOfLine+ componentBodyElement)* endOfLine*
     ;
 
 componentBodyElement
@@ -23,6 +33,7 @@ block
 
 blockStatement
     : comment
+    | conditionalCompilationStatement
     | dimStatement
     | exitStatement
     | forStatement
@@ -50,6 +61,15 @@ associativeElementInitializer
     : (identifier | reservedWord | stringLiteral) COLON assignableExpression
     ;
 
+conditionalCompilationStatement
+    : CONDITIONAL_CONST untypedIdentifier EQUALS expression
+    | CONDITIONAL_ERROR .*?
+    | CONDITIONAL_IF expression
+    | CONDITIONAL_ELSEIF expression
+    | CONDITIONAL_ELSE
+    | CONDITIONAL_ENDIF
+    ;
+
 dimStatement
     : DIM identifier OPEN_BRACKET parameterList CLOSE_BRACKET
     ;
@@ -547,7 +567,7 @@ IDENTIFIER_TYPE_DECLARATION
     ;
 
 COMMENT
-    :   (SINGLE_QUOTE | (REM (WS | NEWLINE))) ~[\r\n\u2028\u2029]* -> channel(HIDDEN)
+    : (SINGLE_QUOTE | (REM (WS | NEWLINE))) ~[\r\n\u2028\u2029]* -> channel(HIDDEN)
     ;
 
 NEWLINE
@@ -558,6 +578,30 @@ WS
     : [ \t]+ -> skip
     ;
 
+CONDITIONAL_CONST
+    : '#' C O N S T
+    ;
+
+CONDITIONAL_ELSE
+    : '#' ELSE
+    ;
+
+CONDITIONAL_ELSEIF
+    : '#' (ELSE WS IF | ELSEIF)
+    ;
+
+CONDITIONAL_ENDIF
+    : '#' (END WS IF | ENDIF)
+    ;
+
+CONDITIONAL_ERROR
+    : '#' E R R O R
+    ;
+
+CONDITIONAL_IF
+    : '#' IF
+    ;
+
 SINGLE_QUOTE
     : '\''
     ;

diff --git a/sample-project/source/GoodSyntax.brs b/sample-project/source/GoodSyntax.brs
@@ -1,11 +1,20 @@
 ' This is a sample file containing syntax that compiles properly
 
+#const debug = true
+
 REM Although the file compiles,
 REM
 REM Not all linting rules pass
 
 sub DefaultMain()
+    #if debug = true
+    print "debug mode enabled"
+    #else
+    print "debug mode disabled"
+    #end if
+
     print "in showChannelSGScreen"
+
     'Indicate this is a Roku SceneGraph application'
     screen = CreateObject("roSGScreen")
     m.port = CreateObject("roMessagePort")