Fix AIDL VHAL metadata extraction script

Add capability to process values from imports.
Update json metadata file with new data.

Testing:
1. cd hardware/interfaces/automotive/vehicle/aidl/emu_metadata
2. ./generate_emulator_metadata.py ../../aidl_property/android/hardware/automotive/vehicle out.json

Bug: 317529575
Test: manual
Change-Id: I315f1f75c2372796bde3bdacd39246344579c002

automotive/vehicle/aidl/emu_metadata/generate_emulator_metadata.py

@@ -19,23 +19,56 @@ import sys
 
 from pathlib import Path
 
+RE_PACKAGE = re.compile(r"\npackage\s([\.a-z0-9]*);")
+RE_IMPORT = re.compile(r"\nimport\s([\.a-zA-Z0-9]*);")
 RE_ENUM = re.compile(r"\s*enum\s+(\w*) {\n(.*)}", re.MULTILINE | re.DOTALL)
-RE_COMMENT = re.compile(r"(?:(?:\/\*\*)((?:.|\n)*?)(?:\*\/))?(?:\n|^)\s*(\w*)(?:\s+=\s*)?((?:[a-zA-Z0-9]|\s|\+|)*),", re.DOTALL)
+RE_COMMENT = re.compile(r"(?:(?:\/\*\*)((?:.|\n)*?)(?:\*\/))?(?:\n|^)\s*(\w*)(?:\s+=\s*)?((?:[\.\-a-zA-Z0-9]|\s|\+|)*),",
+                        re.DOTALL)
 RE_BLOCK_COMMENT_TITLE = re.compile("^(?:\s|\*)*((?:\w|\s|\.)*)\n(?:\s|\*)*(?:\n|$)")
-RE_BLOCK_COMMENT_ANNOTATION = re.compile("^(?:\s|\*)*@(\w*)\s+((?:\w|:)*)", re.MULTILINE)
-RE_HEX_NUMBER = re.compile("([0-9A-Fa-fxX]+)")
+RE_BLOCK_COMMENT_ANNOTATION = re.compile("^(?:\s|\*)*@(\w*)\s+((?:[\w:\.])*)", re.MULTILINE)
+RE_HEX_NUMBER = re.compile("([\.\-0-9A-Za-z]+)")
 
 
 class JEnum:
-    def __init__(self, name):
+    def __init__(self, package, name):
+        self.package = package
         self.name = name
         self.values = []
 
+class Enum:
+    def __init__(self, package, name, text, imports):
+        self.text = text
+        self.parsed = False
+        self.imports = imports
+        self.jenum = JEnum(package, name)
 
-class Converter:
-    # Only addition is supported for now, but that covers all existing properties except
-    # OBD diagnostics, which use bitwise shifts
-    def calculateValue(self, expression, default_value):
+    def parse(self, enums):
+        if self.parsed:
+            return
+        for dep in self.imports:
+            enums[dep].parse(enums)
+        print("Parsing " + self.jenum.name)
+        matches = RE_COMMENT.findall(self.text)
+        defaultValue = 0
+        for match in matches:
+            value = dict()
+            value['name'] = match[1]
+            value['value'] = self.calculateValue(match[2], defaultValue, enums)
+            defaultValue = value['value'] + 1
+            if self.jenum.name == "VehicleProperty":
+                block_comment = match[0]
+                self.parseBlockComment(value, block_comment)
+            self.jenum.values.append(value)
+        self.parsed = True
+        self.text = None
+
+    def get_value(self, value_name):
+        for value in self.jenum.values:
+            if value['name'] == value_name:
+                return value['value']
+        raise Exception("Cannot decode value: " + self.jenum.package + " : " + value_name)
+
+    def calculateValue(self, expression, default_value, enums):
         numbers = RE_HEX_NUMBER.findall(expression)
         if len(numbers) == 0:
             return default_value
@@ -44,7 +77,13 @@ class Converter:
         if numbers[0].lower().startswith("0x"):
             base = 16
         for number in numbers:
-            result += int(number, base)
+            if '.' in number:
+                package, val_name = number.split('.')
+                for dep in self.imports:
+                    if package in dep:
+                        result += enums[dep].get_value(val_name)
+            else:
+                result += int(number, base)
         return result
 
     def parseBlockComment(self, value, blockComment):
@@ -54,30 +93,22 @@ class Converter:
             break
         annots_res = RE_BLOCK_COMMENT_ANNOTATION.findall(blockComment)
         for annot in annots_res:
-            value[annot[0]] = annot[1]
-
-    def parseEnumContents(self, enum: JEnum, enumValue):
-        matches = RE_COMMENT.findall(enumValue)
-        defaultValue = 0
-        for match in matches:
-            value = dict()
-            value['name'] = match[1]
-            value['value'] = self.calculateValue(match[2], defaultValue)
-            defaultValue = value['value'] + 1
-            if enum.name == "VehicleProperty":
-                block_comment = match[0]
-                self.parseBlockComment(value, block_comment)
-            enum.values.append(value)
+            value[annot[0]] = annot[1].replace(".", ":")
 
+class Converter:
+    # Only addition is supported for now, but that covers all existing properties except
+    # OBD diagnostics, which use bitwise shifts
     def convert(self, input):
         text = Path(input).read_text()
         matches = RE_ENUM.findall(text)
-        jenums = []
+        package = RE_PACKAGE.findall(text)[0]
+        imports = RE_IMPORT.findall(text)
+        enums = []
         for match in matches:
-            enum = JEnum(match[0])
-            self.parseEnumContents(enum, match[1])
-            jenums.append(enum)
-        return jenums
+            enum = Enum(package, match[0], match[1], imports)
+            enums.append(enum)
+        return enums
+
 
 def main():
     if (len(sys.argv) != 3):
@@ -85,10 +116,18 @@ def main():
         sys.exit(1)
     aidl_path = sys.argv[1]
     out_path = sys.argv[2]
-    result = []
+    enums_dict = dict()
     for file in os.listdir(aidl_path):
-        result.extend(Converter().convert(os.path.join(aidl_path, file)))
-    json_result = json.dumps(result, default=vars, indent=2)
+        enums = Converter().convert(os.path.join(aidl_path, file))
+        for enum in enums:
+            enums_dict[enum.jenum.package + "." + enum.jenum.name] = enum
+
+    result = []
+    for enum_name, enum in enums_dict.items():
+        enum.parse(enums_dict)
+        result.append(enum.jenum.__dict__)
+
+    json_result = json.dumps(result, default=None, indent=2)
     with open(out_path, 'w') as f:
         f.write(json_result)