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allow optional return types on functions

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Luna 2019-08-26 17:26:20 -03:00
parent 9eaa71cbd6
commit e2f7343242
2 changed files with 22 additions and 3 deletions
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2
examples/hello.v
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@ -52,3 +52,5 @@ fn main(a int) int {
v()()()
}
fn voidfunc() {}

23
src/parser.zig
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@ -375,6 +375,16 @@ pub const Parser = struct {
return root;
}
/// Copy a token with a different lexeme.
fn mkToken(self: *@This(), ttype: TokenType, lexeme: []const u8, line: usize) !Token {
const owned_lexeme = try std.mem.dupe(self.allocator, u8, lexeme);
return Token{
.ttype = ttype,
.lexeme = owned_lexeme,
.line = line,
};
}
fn parseFnDecl(self: *@This()) !*Node {
var param_list = ast.ParamList.init(self.allocator);
errdefer param_list.deinit();
@ -387,7 +397,7 @@ pub const Parser = struct {
while (self.peek().ttype != .RightParen) {
const param_name = try self.consumeSingle(.Identifier);
// TODO dedicated function to consume a type
// TODO dedicated function to consume a type?
const param_type = try self.consumeSingle(.Identifier);
try param_list.append(ast.ParamDecl{
@ -398,8 +408,15 @@ pub const Parser = struct {
_ = try self.consumeSingle(.RightParen);
// TODO dedicated function to consume a type
const return_type = try self.consumeSingle(.Identifier);
// the return type is default void if a type
// is not provided
var return_type: Token = undefined;
if (self.check(.Identifier)) {
return_type = try self.consumeSingle(.Identifier);
} else {
return_type = try self.mkToken(.Identifier, "void", name.line);
}
var block_node = try self.parseBlock();
return try self.mkFnDecl(name, param_list, return_type, block_node.Block);
}