goish 0.13.0

Write Rust using Go idioms — a Go-flavored standard library for Rust
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249

// Port of go1.25.5/src/encoding/json/decode_test.go — Value-level subset.
//
// Go's decode tests rely overwhelmingly on reflection-based struct
// unmarshaling, which goish doesn't have. This port covers the subset
// that maps onto json::Value (equivalent to Go's `any`):
//   - TestEscape            — control/unicode escape sequences
//   - TestEmptyString       — empty JSON strings parse
//   - TestNullString        — null value
//   - TestUnmarshalSyntax   — bad JSON fails
//   - TestSkipArrayObjects  — deep structures parse
//   - TestNumberAccessors   — ints vs floats
//   - TestLargeByteSlice    — base64-ish not applicable; we do big-string
//   - Primitive round-trips, nested round-trips

#![allow(non_snake_case)]
use goish::prelude::*;
use goish::encoding::json::{self, Value};

test!{ fn TestUnmarshalPrimitives(t) {
    // null
    let mut v = Value::Null;
    let err = json::Unmarshal(b"null", &mut v);
    if err != nil || !v.IsNull() {
        t.Errorf(Sprintf!("Unmarshal(null): err=%s, IsNull=%v", err, v.IsNull()));
    }
    // true/false
    let mut v = Value::Null;
    json::Unmarshal(b"true", &mut v);
    if v.Bool() != true { t.Errorf(Sprintf!("true parse = %v", v.Bool())); }
    json::Unmarshal(b"false", &mut v);
    if v.Bool() != false { t.Errorf(Sprintf!("false parse = %v", v.Bool())); }
    // number
    json::Unmarshal(b"42", &mut v);
    if v.Int() != 42 { t.Errorf(Sprintf!("42 parse = %d", v.Int())); }
    json::Unmarshal(b"3.14", &mut v);
    if (v.Float() - 3.14).abs() > 1e-9 { t.Errorf(Sprintf!("3.14 parse = %f", v.Float())); }
    // string
    json::Unmarshal(b"\"hello\"", &mut v);
    if v.String() != "hello" { t.Errorf(Sprintf!("string parse = %q", v.String())); }
}}

test!{ fn TestEmptyString(t) {
    let mut v = Value::Null;
    let err = json::Unmarshal(b"\"\"", &mut v);
    if err != nil { t.Errorf(Sprintf!("empty string: %s", err)); }
    if !v.IsString() || v.String() != "" {
        t.Errorf(Sprintf!("empty string parsed wrong: %v", v.IsString()));
    }
}}

test!{ fn TestNullString(t) {
    let mut v = Value::String("existing".into());
    let err = json::Unmarshal(b"null", &mut v);
    if err != nil { t.Errorf(Sprintf!("null: %s", err)); }
    if !v.IsNull() {
        t.Errorf(Sprintf!("after null unmarshal, IsNull = false"));
    }
}}

struct EscT { r#in: &'static [u8], want: &'static str }

test!{ fn TestEscape(t) {
    let tests = vec![
        EscT { r#in: b"\"\\u0026\"",             want: "&" },
        EscT { r#in: b"\"\\u003c\"",             want: "<" },
        EscT { r#in: b"\"a\\tb\"",               want: "a\tb" },
        EscT { r#in: b"\"\\n\"",                 want: "\n" },
        EscT { r#in: b"\"\\\"quoted\\\"\"",      want: "\"quoted\"" },
        EscT { r#in: b"\"\\/slash\"",            want: "/slash" },
        EscT { r#in: b"\"\\u2028\"",             want: "\u{2028}" },
        EscT { r#in: b"\"hello \\ud83d\\ude00\"", want: "hello \u{1F600}" },
    ];
    for tt in &tests {
        let mut v = Value::Null;
        let err = json::Unmarshal(tt.r#in, &mut v);
        if err != nil {
            t.Errorf(Sprintf!("Unmarshal(%s) err: %s", String::from_utf8_lossy(tt.r#in), err));
            continue;
        }
        if v.String() != tt.want {
            t.Errorf(Sprintf!("escape: got %q want %q", v.String(), tt.want));
        }
    }
}}

test!{ fn TestUnmarshalSyntax(t) {
    let bad = vec![
        &b"{"[..], &b"}"[..], &b"["[..], &b"]"[..],
        &b"{\"a\":}"[..], &b"{1:2}"[..], &b"[1 2 3]"[..],
        &b"\"unterminated"[..], &b"not json"[..], &b""[..],
        &b"{\"a\":1,}"[..], &b"[1,2,]"[..],
    ];
    for b in bad {
        let mut v = Value::Null;
        let err = json::Unmarshal(b, &mut v);
        if err == nil {
            t.Errorf(Sprintf!("Unmarshal(%s) = nil, want error", String::from_utf8_lossy(b)));
        }
    }
}}

test!{ fn TestValid(t) {
    let good = vec![
        &b"null"[..], &b"true"[..], &b"false"[..], &b"42"[..],
        &b"3.14"[..], &b"\"x\""[..], &b"[1,2,3]"[..], &b"{\"a\":1}"[..],
        &b"{}"[..], &b"[]"[..], &b"{\"nested\":{\"k\":[1,2,3]}}"[..],
    ];
    for b in good {
        if !json::Valid(b) {
            t.Errorf(Sprintf!("Valid(%s) = false, want true", String::from_utf8_lossy(b)));
        }
    }
    let bad = vec![
        &b"not json"[..], &b"{"[..], &b"[1,2"[..], &b"nulll"[..],
    ];
    for b in bad {
        if json::Valid(b) {
            t.Errorf(Sprintf!("Valid(%s) = true, want false", String::from_utf8_lossy(b)));
        }
    }
}}

test!{ fn TestUnmarshalNestedArray(t) {
    let mut v = Value::Null;
    let err = json::Unmarshal(b"[[1,2],[3,4],[5]]", &mut v);
    if err != nil { t.Errorf(Sprintf!("err: %s", err)); return; }
    if !v.IsArray() || v.Len() != 3 {
        t.Errorf(Sprintf!("expected 3-element array, got %d", v.Len()));
        return;
    }
    if v.Index(0).Len() != 2 || v.Index(0).Index(0).Int() != 1 || v.Index(0).Index(1).Int() != 2 {
        t.Errorf(Sprintf!("inner 0 mismatch"));
    }
    if v.Index(2).Len() != 1 || v.Index(2).Index(0).Int() != 5 {
        t.Errorf(Sprintf!("inner 2 mismatch"));
    }
}}

test!{ fn TestUnmarshalNestedObject(t) {
    let input = "{\"outer\":{\"inner\":{\"k\":\"v\",\"n\":42},\"list\":[1,2,3]},\"other\":true}";
    let mut v = Value::Null;
    json::Unmarshal(input.as_bytes(), &mut v);
    if v.Get("outer").Get("inner").Get("k").String() != "v" {
        t.Errorf(Sprintf!("outer.inner.k mismatch"));
    }
    if v.Get("outer").Get("inner").Get("n").Int() != 42 {
        t.Errorf(Sprintf!("outer.inner.n mismatch"));
    }
    if v.Get("outer").Get("list").Len() != 3 {
        t.Errorf(Sprintf!("outer.list len mismatch"));
    }
    if v.Get("other").Bool() != true {
        t.Errorf(Sprintf!("other mismatch"));
    }
}}

test!{ fn TestUnmarshalRoundtrip(t) {
    let originals = vec![
        "null",
        "true",
        "false",
        "42",
        "-17",
        "0.5",
        "\"hello\"",
        "[1,2,3]",
        "{\"a\":1,\"b\":\"x\"}",
        "{\"nested\":[{\"k\":true},{\"k\":false}]}",
    ];
    for s in originals {
        let mut v = Value::Null;
        let err = json::Unmarshal(s.as_bytes(), &mut v);
        if err != nil { t.Errorf(Sprintf!("Unmarshal(%q): %s", s, err)); continue; }
        let (b, err) = json::Marshal(&v);
        if err != nil { t.Errorf(Sprintf!("Marshal after Unmarshal(%q): %s", s, err)); continue; }
        let got = String::from_utf8(b).unwrap();
        if got != s {
            t.Errorf(Sprintf!("roundtrip: %q → %q", s, got));
        }
    }
}}

test!{ fn TestNumberAccessors(t) {
    // Go's json.Number has Int64/Float64/String. We expose Int/Float/String on Value.
    let mut v = Value::Null;
    json::Unmarshal(b"1e2", &mut v);
    if v.Float() != 100.0 { t.Errorf(Sprintf!("1e2 → %f, want 100.0", v.Float())); }
    json::Unmarshal(b"-123", &mut v);
    if v.Int() != -123 { t.Errorf(Sprintf!("-123 → %d", v.Int())); }
}}

test!{ fn TestSkipArrayObjects(t) {
    // Parse deeply nested arrays/objects.
    let input = "[[{},[]],[[[{\"x\":1}]]]]";
    let mut v = Value::Null;
    let err = json::Unmarshal(input.as_bytes(), &mut v);
    if err != nil { t.Errorf(Sprintf!("err: %s", err)); }
    if !v.IsArray() || v.Len() != 2 {
        t.Errorf(Sprintf!("skip: top-level Len = %d", v.Len()));
    }
}}

test!{ fn TestLargeString(t) {
    let big = "a".repeat(10000);
    let input = format!("\"{}\"", big);
    let mut v = Value::Null;
    json::Unmarshal(input.as_bytes(), &mut v);
    if v.String().len() != 10000 {
        t.Errorf(Sprintf!("large string len = %d, want 10000", v.String().len()));
    }
}}

test!{ fn TestObjectGetAbsent(t) {
    let mut v = Value::Null;
    json::Unmarshal(b"{\"a\":1}", &mut v);
    // Looking up missing keys should return Null, not panic.
    let missing = v.Get("nope");
    if !missing.IsNull() {
        t.Errorf(Sprintf!("Get absent key should be Null"));
    }
    // Chained misses.
    let chained = v.Get("nope").Get("also").Index(0);
    if !chained.IsNull() {
        t.Errorf(Sprintf!("chained missing should be Null"));
    }
}}

test!{ fn TestUnmarshalMarshalRoundTrip(t) {
    // Build a complex Value, Marshal it, Unmarshal it back, compare.
    let original = Value::Object(vec![
        ("a".into(), Value::Number(1.0)),
        ("b".into(), Value::Array(vec![
            Value::String("x".into()),
            Value::Bool(true),
            Value::Null,
        ])),
        ("c".into(), Value::Object(vec![
            ("d".into(), Value::Number(-42.0)),
        ])),
    ]);
    let (bytes_, err) = json::Marshal(&original);
    if err != nil { t.Errorf(Sprintf!("Marshal: %s", err)); return; }
    let mut decoded = Value::Null;
    let err = json::Unmarshal(&bytes_, &mut decoded);
    if err != nil { t.Errorf(Sprintf!("Unmarshal: %s", err)); return; }
    if original != decoded {
        t.Errorf(Sprintf!("round-trip mismatch"));
    }
}}