nitj: introduce JavaCompilerVisitor to generate java code

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>

diff --git a/src/compiler/java_compiler.nit b/src/compiler/java_compiler.nit
index 3d1384d..be527f5 100644 (file)
--- a/src/compiler/java_compiler.nit
+++ b/src/compiler/java_compiler.nit
@@ -194,12 +194,44 @@ class JavaCompiler
                return file
        end
 
+       # Kind of visitor to use
+       type VISITOR: JavaCompilerVisitor
+
+       # Initialize a visitor specific for the compiler engine
+       fun new_visitor(filename: String): VISITOR do
+               return new JavaCompilerVisitor(self, new_file(filename))
+       end
+
        # Compile Nit code to Java
        fun do_compilation do
                modelbuilder.toolcontext.info("NOT YET IMPLEMENTED", 0)
        end
 end
 
+# The class visiting the AST
+#
+# A visitor is attached to one JavaCodeFile it writes into.
+class JavaCompilerVisitor
+       super Visitor
+
+       # JavaCompiler used with this visitor
+       type COMPILER: JavaCompiler
+
+       # The associated compiler
+       var compiler: JavaCompiler
+
+       # The file to write generated code into
+       var file: JavaCodeFile
+
+       # Code generation
+
+       # Add a line (will be suffixed by `\n`)
+       fun add(line: String) do file.lines.add("{line}\n")
+
+       # Add a new partial line (no `\n` suffix)
+       fun addn(line: String) do file.lines.add(line)
+end
+
 # A file containing Java code.
 class JavaCodeFile