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std: change default json enum encoder to use strings or a flat vec

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This commit is contained in:
Erick Tryzelaar 2013-03-27 00:14:52 -07:00
parent b10b8c3ee4
commit 4d995e66a2
2 changed files with 33 additions and 56 deletions
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57
src/libstd/json.rs
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@ -119,22 +119,15 @@ impl serialize::Encoder for Encoder {
f()
}
fn emit_enum_variant(&self, name: &str, _id: uint, _cnt: uint, f: &fn()) {
fn emit_enum_variant(&self, name: &str, _id: uint, cnt: uint, f: &fn()) {
// encoding of enums is special-cased for Option. Specifically:
// Some(34) => 34
// None => null
// other enums are encoded as vectors:
// other enums are encoded as strings or vectors:
// Bunny => "Bunny"
// Kangaroo(34,"William") => ["Kangaroo",[34,"William"]]
// the default expansion for enums is more verbose than I'd like;
// specifically, the inner pair of brackets seems superfluous,
// BUT the design of the enumeration framework and the requirements
// of the special-case for Option mean that a first argument must
// be encoded "naked"--with no commas--and that the option name
// can't be followed by just a comma, because there might not
// be any elements in the tuple.
// FIXME #4872: this would be more precise and less frightening
// with fully-qualified option names. To get that information,
// we'd have to change the expansion of auto-encode to pass
@ -144,14 +137,14 @@ impl serialize::Encoder for Encoder {
f();
} else if name == ~"None" {
self.wr.write_str(~"null");
} else if cnt == 0 {
self.wr.write_str(escape_str(name));
} else {
self.wr.write_char('[');
self.wr.write_str(escape_str(name));
self.wr.write_char(',');
self.wr.write_char('[');
f();
self.wr.write_char(']');
self.wr.write_char(']');
}
}
@ -256,28 +249,19 @@ impl serialize::Encoder for PrettyEncoder {
f();
} else if name == ~"None" {
self.emit_nil();
} else if cnt == 0 {
self.wr.write_str(escape_str(name));
} else {
self.wr.write_char('[');
self.indent += 2;
self.wr.write_char('\n');
self.wr.write_str(spaces(self.indent));
self.wr.write_str(escape_str(name));
if cnt == 0 {
self.wr.write_str(",\n");
self.wr.write_str(spaces(self.indent));
self.wr.write_str("[]\n");
} else {
self.wr.write_str(",\n");
self.wr.write_str(spaces(self.indent));
self.wr.write_str("[\n");
self.indent += 2;
f();
self.wr.write_char('\n');
self.indent -= 2;
self.wr.write_str(spaces(self.indent));
self.wr.write_str("]\n");
}
self.wr.write_str(",\n");
f();
self.wr.write_char('\n');
self.indent -= 2;
self.wr.write_str(spaces(self.indent));
self.wr.write_char(']');
}
}
@ -1406,7 +1390,7 @@ mod tests {
let encoder = Encoder(wr);
animal.encode(&encoder);
};
assert_eq!(s, ~"[\"Dog\",[]]");
assert_eq!(s, ~"\"Dog\"");
}
#[test]
@ -1417,14 +1401,7 @@ mod tests {
let encoder = PrettyEncoder(wr);
animal.encode(&encoder);
};
assert_eq!(
s,
~"\
[\n \
\"Dog\",\n \
[]\n\
]"
);
assert_eq!(s, ~"\"Dog\"");
}
#[test]
@ -1435,7 +1412,7 @@ mod tests {
let encoder = Encoder(wr);
animal.encode(&encoder);
};
assert_eq!(s, ~"[\"Frog\",[\"Henry\",349]]");
assert_eq!(s, ~"[\"Frog\",\"Henry\",349]");
}
#[test]
@ -1451,10 +1428,8 @@ mod tests {
~"\
[\n \
\"Frog\",\n \
[\n \
\"Henry\",\n \
349\n \
]\n\
\"Henry\",\n \
349\n\
]"
);
}