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[Yunq] Add ability to namespace declarations using "package".

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This commit is contained in:
Drew Galbraith 2023-11-30 08:50:15 -08:00
parent 9fdd670a23
commit f1e09b2ae6
15 changed files with 153 additions and 10 deletions
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31
yunq/parser.py
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@ -16,6 +16,7 @@ class LexemeType(Enum):
RIGHT_PAREN = 6
ARROW = 7
SEMICOLON = 8
DOT = 9
class Lexeme():
@ -55,6 +56,8 @@ def lexer(program: str):
tokens.append(Lexeme(LexemeType.RIGHT_PAREN))
elif curr == ';':
tokens.append(Lexeme(LexemeType.SEMICOLON))
elif curr == '.':
tokens.append(Lexeme(LexemeType.DOT))
elif curr == '-':
current += 1
if program[current] == '>':
@ -77,6 +80,12 @@ def lexer(program: str):
return tokens
class Package():
def __init__(self, names: list[str]):
self.names = names
def cpp_namespace(self):
return "::".join(self.names)
class Method():
def __init__(self, name: str, request: str, response: str):
@ -174,11 +183,25 @@ class Parser():
token = self.consume()
if token.type != LexemeType.NAME:
sys.exit("Unexpected token: %s", token)
if token.value == "package":
# TODO: Enforce that package decl comes before all messages and interface.
return self.package()
if token.value == "message":
return self.message()
elif token.value == "interface":
return self.interface()
sys.exit("Unexpected identifier '%s', expected message or interface" % token.value)
sys.exit("Unexpected identifier '%s', expected package, message, interface" % token.value)
def package(self):
names = [self.consume_identifier()]
while self.peektype() == LexemeType.DOT:
self.consume_check(LexemeType.DOT)
names += [self.consume_identifier()]
self.consume_check(LexemeType.SEMICOLON)
return Package(names)
def interface(self):
# "interface" consumed by decl.
@ -273,6 +296,8 @@ class Parser():
return Field(field_type, name, repeated)
def type_check(decls: list[Decl]):
if sum(1 for decl in decls if type(decl) is Package) > 1:
sys.exit("Cannot have more than one package declaration")
for decl in decls:
if type(decl) is Interface:
for method in decl.methods:
@ -291,7 +316,9 @@ def type_check(decls: list[Decl]):
def print_ast(decls: list[Decl]):
for decl in decls:
if type(decl) is Interface:
if type(decl) is Package:
print("%s (Package)" % decl.cpp_namespace())
elif type(decl) is Interface:
print("%s (Interface)" % decl.name)
for method in decl.methods:
print("\t%s (%s -> %s)" % (method.name, method.request, method.response))