msggen: adding example and fixes typo

Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>

contrib/msggen/examples/generator_example.py

@@ -0,0 +1,36 @@
+#! /usr/bin/python3
+"""
+Example of usage msggen module.
+
+This example introduces a fake generator to understand how the
+package works, If you would like to see a real generator example
+try to see the Rust generator in the `msggen/gen/rust.py`
+
+author: https://github.com/vincenzopalazzo
+"""
+
+from msggen.gen.generator import GeneratorChain, IGenerator
+from msggen.utils import load_jsonrpc_service
+
+
+class MonkylangGen(IGenerator):
+    """This is the custom generator that implements a monkylang generator
+     that uses the interface handler IGenerator."""
+
+    def generate(self, service: Service):
+        self.write('println("Monky")')
+
+def register_monkylang_gen(generator_chain: GeneratorChain):
+    """Helper function to register the custom generator, and
+    load the correct path of the json schema."""
+    file = '<your_path_of_result>'
+    dest = open(file, 'w')
+    generator_chain.add_generator(MonkylangGen(dest))
+
+
+if __name__ == '__main__':
+    schema_dir = '<path_of_json_schema_dir>'
+    service = load_jsonrpc_service(schema_dir=schema_dir)
+    generator_chain = GeneratorChain()
+    register_monkylang_gen(generator_chain)
+    generator_chain.generate(service)

contrib/msggen/msggen/gen/generator.py

@@ -10,7 +10,7 @@
 
 class IGenerator(ABC):
     """
-    Change of responsibility handler that need to be
+    Chain of responsibility handler that need to be
     implemented by all the generators.
     """
 
@@ -21,7 +21,7 @@ def generate(self, service: Service):
 
 class GeneratorChain:
     """
-    Chain responsibility patter implementation to generalize
+    Chain responsibility pattern implementation to generalize
     the generation method.
     """