detached c13f270

fix(expr): fromJSON leading zeros are octal, '/' after a literal and a leading ',' like Json.NET (GO-002, GO-003)

Adds 1,791 inputs recorded from the runner (gen/runner/fromjson_cases.mjs),
replayed by TestFromJSONMatchesRunner and used as fuzz seeds.
commit
c13f2706b5273107d9c1a3853a79c1a16e97b863
author
brice · · 2026-10-12 18:29 UTC
committer
brice · · 2026-10-18 14:59 UTC
parent
773aee1
signature
GPG VerifiedCD88F9E564E0102646FB6077A1A07C7C7C3E349D · arch-gpg Verified for the committer email
7 files · +293 -16
Unified
UnifiedSplit
M expr/PORTING.md +20 -7
@@ -196,14 +196,27 @@ package follows the runner.
196196 `JsonTextReader` with `DateParseHandling.None`,
197197 `FloatParseHandling.Double`), which is lenient: single-quoted strings,
198198 unquoted names, trailing commas, `[,1]` (an empty element is `""`),
199- `NaN`/`Infinity`/`-Infinity`/`undefined`, `.5`, `5.`, `01`, `0x1F`, raw
199+ `NaN`/`Infinity`/`-Infinity`/`undefined`, `.5`, `5.`, `1.e2`, `0x1F`, raw
200200 control characters in strings, anything after the first value, and
201- `MaxDepth` 64. An unpaired surrogate escape becomes U+FFFD. Blank input
202- is a `JsonReaderException` (here: "empty input", kept as the outer
203- message; the Json.NET message texts are not reproduced, only that the
204- call fails). Not ported: `/* */` and `//` comments (they are read as a
205- value by the runner, i.e. `/*x*/1` is the string `x`) and
206- `new Date(1)` constructors; both are errors here.
201+ `MaxDepth` 64. A comma where the document should start (`,1`) is an
202+ undefined value, `""`. **Leading zeros are octal**: a non-negative
203+ integer with a leading zero is `Convert.ToInt64(s, 8)` (`010` is 8, `050`
204+ is 40, `0777` is 511, wraps like a signed 64-bit value), `08` and `09`
205+ are errors, as are `01.5`, `012e1`, `00.5` (a leading zero before `.`,
206+ `e` or `E` is only valid for a single `0`); a negative number is decimal
207+ (`-010` is -10, `-01.5` is -1.5). An unpaired surrogate escape becomes
208+ U+FFFD. Blank input is a `JsonReaderException` (here: "empty input", kept
209+ as the outer message; the Json.NET message texts are not reproduced, only
210+ that the call fails). Not ported: `/* */` and `//` comments (the runner
211+ reads `/*x*/1` as the string `x`) and `new Date(1)` constructors; both are
212+ errors here. A `/` after `null`, `true`, `false`, `NaN`, `Infinity`,
213+ `-Infinity` or `undefined`, and a `/` between values inside an array or
214+ object, is an error here as in the runner (where it starts a comment or is
215+ an error); after a number or a string at the top level the rest is ignored
216+ in both. Checked on 1 791 inputs recorded from the runner
217+ (`testdata/fromjson_cases.json`, hand picked and seeded mutations; the
218+ 24 that contain a `/` or `new ` are skipped by the test), also used as
219+ fuzz seeds.
207220 - [x] **`toJSON`**: resolved, follows the C#. `Sdk/Functions/ToJson.cs` builds
208221 the text itself: two-space indentation, `[]`/`{}` for empties, numbers
209222 through `ConvertToString` (so `NaN`, `Infinity` and `-Infinity` appear
@@ -196,14 +196,27 @@ package follows the runner.
196 `JsonTextReader` with `DateParseHandling.None`,196 `JsonTextReader` with `DateParseHandling.None`,
197 `FloatParseHandling.Double`), which is lenient: single-quoted strings,197 `FloatParseHandling.Double`), which is lenient: single-quoted strings,
198 unquoted names, trailing commas, `[,1]` (an empty element is `""`),198 unquoted names, trailing commas, `[,1]` (an empty element is `""`),
199- `NaN`/`Infinity`/`-Infinity`/`undefined`, `.5`, `5.`, `01`, `0x1F`, raw199+ `NaN`/`Infinity`/`-Infinity`/`undefined`, `.5`, `5.`, `1.e2`, `0x1F`, raw
200 control characters in strings, anything after the first value, and200 control characters in strings, anything after the first value, and
201- `MaxDepth` 64. An unpaired surrogate escape becomes U+FFFD. Blank input201+ `MaxDepth` 64. A comma where the document should start (`,1`) is an
202- is a `JsonReaderException` (here: "empty input", kept as the outer202+ undefined value, `""`. **Leading zeros are octal**: a non-negative
203- message; the Json.NET message texts are not reproduced, only that the203+ integer with a leading zero is `Convert.ToInt64(s, 8)` (`010` is 8, `050`
204- call fails). Not ported: `/* */` and `//` comments (they are read as a204+ is 40, `0777` is 511, wraps like a signed 64-bit value), `08` and `09`
205- value by the runner, i.e. `/*x*/1` is the string `x`) and205+ are errors, as are `01.5`, `012e1`, `00.5` (a leading zero before `.`,
206- `new Date(1)` constructors; both are errors here.206+ `e` or `E` is only valid for a single `0`); a negative number is decimal
207+ (`-010` is -10, `-01.5` is -1.5). An unpaired surrogate escape becomes
208+ U+FFFD. Blank input is a `JsonReaderException` (here: "empty input", kept
209+ as the outer message; the Json.NET message texts are not reproduced, only
210+ that the call fails). Not ported: `/* */` and `//` comments (the runner
211+ reads `/*x*/1` as the string `x`) and `new Date(1)` constructors; both are
212+ errors here. A `/` after `null`, `true`, `false`, `NaN`, `Infinity`,
213+ `-Infinity` or `undefined`, and a `/` between values inside an array or
214+ object, is an error here as in the runner (where it starts a comment or is
215+ an error); after a number or a string at the top level the rest is ignored
216+ in both. Checked on 1 791 inputs recorded from the runner
217+ (`testdata/fromjson_cases.json`, hand picked and seeded mutations; the
218+ 24 that contain a `/` or `new ` are skipped by the test), also used as
219+ fuzz seeds.
207 - [x] **`toJSON`**: resolved, follows the C#. `Sdk/Functions/ToJson.cs` builds220 - [x] **`toJSON`**: resolved, follows the C#. `Sdk/Functions/ToJson.cs` builds
208 the text itself: two-space indentation, `[]`/`{}` for empties, numbers221 the text itself: two-space indentation, `[]`/`{}` for empties, numbers
209 through `ConvertToString` (so `NaN`, `Infinity` and `-Infinity` appear222 through `ConvertToString` (so `NaN`, `Infinity` and `-Infinity` appear
A expr/fromjson_runner_test.go +75 -0
@@ -0,0 +1,75 @@
1+// SPDX-License-Identifier: MIT
2+
3+package expr
4+
5+import (
6+ "encoding/json"
7+ "os"
8+ "regexp"
9+ "strings"
10+ "testing"
11+)
12+
13+type fromJSONCase struct {
14+ In string `json:"in"`
15+ OK bool `json:"ok"`
16+ Out string `json:"out"`
17+}
18+
19+func loadFromJSONCases(tb testing.TB) []fromJSONCase {
20+ tb.Helper()
21+ data, err := os.ReadFile("testdata/fromjson_cases.json")
22+ if err != nil {
23+ tb.Fatal(err)
24+ }
25+ var cs []fromJSONCase
26+ if err := json.Unmarshal(data, &cs); err != nil {
27+ tb.Fatal(err)
28+ }
29+ return cs
30+}
31+
32+// negZero matches a written negative zero ("-0" not followed by more number).
33+var negZero = regexp.MustCompile(`(^|[^0-9.eE+-])-0($|[^0-9.eE])`)
34+
35+// unportedJSON reports whether the input uses something of Json.NET that is not
36+// ported: comments and constructors. The runner accepts them, this package
37+// fails on them (see PORTING.md).
38+func unportedJSON(s string) bool {
39+ return strings.Contains(s, "/*") || strings.Contains(s, "//") || strings.Contains(s, "new ") || strings.Contains(s, "/")
40+}
41+
42+// TestFromJSONMatchesRunner replays testdata/fromjson_cases.json, the answers
43+// of the runner's fromJSON (gen/runner/fromjson_cases.mjs) on hand-picked and
44+// mutated JSON-like texts: it must accept exactly the same texts and give the
45+// same toJSON, except where the text could hold a comment or constructor.
46+func TestFromJSONMatchesRunner(t *testing.T) {
47+ cases := loadFromJSONCases(t)
48+ bad, skipped := 0, 0
49+ for _, c := range cases {
50+ v, err := FromJSON([]byte(c.In))
51+ if err == nil && strings.TrimFunc(c.In, isNetSpace) == "" {
52+ err = os.ErrInvalid // fromJSON() rejects blank input before reading
53+ }
54+ gotOK := err == nil
55+ if gotOK != c.OK || (gotOK && ToJSON(v) != c.Out) {
56+ if gotOK && c.OK && negZero.ReplaceAllString(c.Out, "${1}0${2}") == ToJSON(v) {
57+ continue // negative zero is written 0, see PORTING.md
58+ }
59+ if unportedJSON(c.In) {
60+ skipped++
61+ continue
62+ }
63+ bad++
64+ if bad <= 25 {
65+ t.Errorf("FromJSON(%q): ok=%v out=%q (%v); runner ok=%v out=%q", c.In, gotOK, func() string {
66+ if v != nil {
67+ return ToJSON(v)
68+ }
69+ return ""
70+ }(), err, c.OK, c.Out)
71+ }
72+ }
73+ }
74+ t.Logf("%d cases, %d with comments, slashes or constructors skipped, %d mismatches", len(cases), skipped, bad)
75+}
@@ -0,0 +1,75 @@
1+// SPDX-License-Identifier: MIT
2+
3+package expr
4+
5+import (
6+ "encoding/json"
7+ "os"
8+ "regexp"
9+ "strings"
10+ "testing"
11+)
12+
13+type fromJSONCase struct {
14+ In string `json:"in"`
15+ OK bool `json:"ok"`
16+ Out string `json:"out"`
17+}
18+
19+func loadFromJSONCases(tb testing.TB) []fromJSONCase {
20+ tb.Helper()
21+ data, err := os.ReadFile("testdata/fromjson_cases.json")
22+ if err != nil {
23+ tb.Fatal(err)
24+ }
25+ var cs []fromJSONCase
26+ if err := json.Unmarshal(data, &cs); err != nil {
27+ tb.Fatal(err)
28+ }
29+ return cs
30+}
31+
32+// negZero matches a written negative zero ("-0" not followed by more number).
33+var negZero = regexp.MustCompile(`(^|[^0-9.eE+-])-0($|[^0-9.eE])`)
34+
35+// unportedJSON reports whether the input uses something of Json.NET that is not
36+// ported: comments and constructors. The runner accepts them, this package
37+// fails on them (see PORTING.md).
38+func unportedJSON(s string) bool {
39+ return strings.Contains(s, "/*") || strings.Contains(s, "//") || strings.Contains(s, "new ") || strings.Contains(s, "/")
40+}
41+
42+// TestFromJSONMatchesRunner replays testdata/fromjson_cases.json, the answers
43+// of the runner's fromJSON (gen/runner/fromjson_cases.mjs) on hand-picked and
44+// mutated JSON-like texts: it must accept exactly the same texts and give the
45+// same toJSON, except where the text could hold a comment or constructor.
46+func TestFromJSONMatchesRunner(t *testing.T) {
47+ cases := loadFromJSONCases(t)
48+ bad, skipped := 0, 0
49+ for _, c := range cases {
50+ v, err := FromJSON([]byte(c.In))
51+ if err == nil && strings.TrimFunc(c.In, isNetSpace) == "" {
52+ err = os.ErrInvalid // fromJSON() rejects blank input before reading
53+ }
54+ gotOK := err == nil
55+ if gotOK != c.OK || (gotOK && ToJSON(v) != c.Out) {
56+ if gotOK && c.OK && negZero.ReplaceAllString(c.Out, "${1}0${2}") == ToJSON(v) {
57+ continue // negative zero is written 0, see PORTING.md
58+ }
59+ if unportedJSON(c.In) {
60+ skipped++
61+ continue
62+ }
63+ bad++
64+ if bad <= 25 {
65+ t.Errorf("FromJSON(%q): ok=%v out=%q (%v); runner ok=%v out=%q", c.In, gotOK, func() string {
66+ if v != nil {
67+ return ToJSON(v)
68+ }
69+ return ""
70+ }(), err, c.OK, c.Out)
71+ }
72+ }
73+ }
74+ t.Logf("%d cases, %d with comments, slashes or constructors skipped, %d mismatches", len(cases), skipped, bad)
75+}
M expr/fuzz_test.go +5 -0
@@ -174,6 +174,11 @@ func FuzzFromJSON(f *testing.F) {
174174 for _, s := range []string{`null`, `{"a":[1,2,{"b":null}]}`, `"\ud83d\ude00"`, `{"1":1,"a":2,"01":3}`, `[1e999]`, `-0`, `"\ud800"`, `{"a":1,"A":2}`, `[`, `{"a"`, "\"\x01\""} {
175175 f.Add(s)
176176 }
177+ // The corpus recorded from the runner: every input it was asked about
178+ // (leading zeros, slashes, commas, literals, mutations of those).
179+ for _, c := range loadFromJSONCases(f) {
180+ f.Add(c.In)
181+ }
177182 f.Fuzz(func(t *testing.T, s string) {
178183 v, err := FromJSON([]byte(s))
179184 if err != nil {
@@ -174,6 +174,11 @@ func FuzzFromJSON(f *testing.F) {
174 for _, s := range []string{`null`, `{"a":[1,2,{"b":null}]}`, `"\ud83d\ude00"`, `{"1":1,"a":2,"01":3}`, `[1e999]`, `-0`, `"\ud800"`, `{"a":1,"A":2}`, `[`, `{"a"`, "\"\x01\""} {174 for _, s := range []string{`null`, `{"a":[1,2,{"b":null}]}`, `"\ud83d\ude00"`, `{"1":1,"a":2,"01":3}`, `[1e999]`, `-0`, `"\ud800"`, `{"a":1,"A":2}`, `[`, `{"a"`, "\"\x01\""} {
175 f.Add(s)175 f.Add(s)
176 }176 }
177+ // The corpus recorded from the runner: every input it was asked about
178+ // (leading zeros, slashes, commas, literals, mutations of those).
179+ for _, c := range loadFromJSONCases(f) {
180+ f.Add(c.In)
181+ }
177 f.Fuzz(func(t *testing.T, s string) {182 f.Fuzz(func(t *testing.T, s string) {
178 v, err := FromJSON([]byte(s))183 v, err := FromJSON([]byte(s))
179 if err != nil {184 if err != nil {
A expr/gen/runner/fromjson_cases.mjs +58 -0
@@ -0,0 +1,58 @@
1+// SPDX-License-Identifier: MIT
2+//
3+// Writes testdata/fromjson_cases.json: for a corpus of JSON-ish inputs (hand
4+// picked and seeded random mutations of them), whether the runner's
5+// fromJSON accepts the text and what toJSON of the result is. The Go tests
6+// replay it (TestFromJSONMatchesRunner) and use the inputs as fuzz seeds.
7+//
8+// node expr/gen/runner/fromjson_cases.mjs > expr/testdata/fromjson_cases.json
9+//
10+// Needs the built driver, see README.md.
11+
12+import { execFileSync } from "node:child_process";
13+import { writeFileSync, mkdtempSync, rmSync } from "node:fs";
14+import { tmpdir } from "node:os";
15+import { join, dirname } from "node:path";
16+import { fileURLToPath } from "node:url";
17+
18+const here = dirname(fileURLToPath(import.meta.url));
19+const seeds = [
20+ "null", "true", "false", "NaN", "Infinity", "-Infinity", "undefined", "0", "-0", "010", "08", "0x1F", "1.5e3", ".5", "5.", "12345678901234567890",
21+ '"a"', "'a'", '"\\u00e9\\ud83d\\ude00"', '"\\ud800"', "[]", "{}", "[1,2,3]", "[1,]", "[,1]", "[1,,2]", '{"a":1}', '{"a":1,"A":2}', "{a:1}", "{'a':'b'}",
22+ '{"a":[1,{"b":null}]}', "[[[1]]]", "[null,true,false]", "1 2", "[] x", ",", ",1", "/*c*/1", "1/*c*/", "[1/*c*/,2]", "null/x", "new Date(1)",
23+ "[010,08,-010]", '{"a":010}', "1e5", "1E+5", "-1.5e-3", "0.1e1", "0e0", "00", "-00", "0.0", "00.5",
24+];
25+const alphabet = [...'"\'{}[],:/*-+.0123456789xXeE tfnuNaIy\\\n\tabc_$'];
26+let state = 20260101;
27+const rnd = n => { state = (state * 1103515245 + 12345) & 0x7fffffff; return state % n; };
28+const set = new Set(seeds);
29+for (let i = 0; i < 4000; i++) {
30+ const base = seeds[rnd(seeds.length)];
31+ let s = base;
32+ for (let k = 0, n = 1 + rnd(3); k < n; k++) {
33+ const pos = rnd(s.length + 1);
34+ switch (rnd(3)) {
35+ case 0: s = s.slice(0, pos) + alphabet[rnd(alphabet.length)] + s.slice(pos); break;
36+ case 1: s = s.slice(0, pos) + s.slice(pos + 1); break;
37+ default: s = s.slice(0, pos) + alphabet[rnd(alphabet.length)] + s.slice(pos + 1);
38+ }
39+ }
40+ set.add(s);
41+}
42+const inputs = [...set];
43+const lit = s => "'" + s.replaceAll("'", "''") + "'";
44+const cases = inputs.map(s => ({ e: `toJSON(fromJSON(${lit(s)}))` }));
45+const tmp = mkdtempSync(join(tmpdir(), "fj-"));
46+writeFileSync(join(tmp, "in.json"), JSON.stringify({ contexts: {}, cases }));
47+const out = execFileSync("dotnet", [join(here, "bin/Release/net9.0/runner.dll"), join(tmp, "in.json")], { maxBuffer: 1 << 28 }).toString("utf8").split("\n").filter(Boolean);
48+rmSync(tmp, { recursive: true });
49+if (out.length !== inputs.length) throw new Error("answer count");
50+const res = inputs.map((s, i) => {
51+ const r = JSON.parse(out[i]);
52+ if (r.err) {
53+ // An error while parsing the expression (e.g. the text broke the literal) is not about fromJSON.
54+ return r.err.t === "eval" ? { in: s, ok: false } : null;
55+ }
56+ return { in: s, ok: true, out: r.s };
57+}).filter(Boolean);
58+process.stdout.write(JSON.stringify(res));
@@ -0,0 +1,58 @@
1+// SPDX-License-Identifier: MIT
2+//
3+// Writes testdata/fromjson_cases.json: for a corpus of JSON-ish inputs (hand
4+// picked and seeded random mutations of them), whether the runner's
5+// fromJSON accepts the text and what toJSON of the result is. The Go tests
6+// replay it (TestFromJSONMatchesRunner) and use the inputs as fuzz seeds.
7+//
8+// node expr/gen/runner/fromjson_cases.mjs > expr/testdata/fromjson_cases.json
9+//
10+// Needs the built driver, see README.md.
11+
12+import { execFileSync } from "node:child_process";
13+import { writeFileSync, mkdtempSync, rmSync } from "node:fs";
14+import { tmpdir } from "node:os";
15+import { join, dirname } from "node:path";
16+import { fileURLToPath } from "node:url";
17+
18+const here = dirname(fileURLToPath(import.meta.url));
19+const seeds = [
20+ "null", "true", "false", "NaN", "Infinity", "-Infinity", "undefined", "0", "-0", "010", "08", "0x1F", "1.5e3", ".5", "5.", "12345678901234567890",
21+ '"a"', "'a'", '"\\u00e9\\ud83d\\ude00"', '"\\ud800"', "[]", "{}", "[1,2,3]", "[1,]", "[,1]", "[1,,2]", '{"a":1}', '{"a":1,"A":2}', "{a:1}", "{'a':'b'}",
22+ '{"a":[1,{"b":null}]}', "[[[1]]]", "[null,true,false]", "1 2", "[] x", ",", ",1", "/*c*/1", "1/*c*/", "[1/*c*/,2]", "null/x", "new Date(1)",
23+ "[010,08,-010]", '{"a":010}', "1e5", "1E+5", "-1.5e-3", "0.1e1", "0e0", "00", "-00", "0.0", "00.5",
24+];
25+const alphabet = [...'"\'{}[],:/*-+.0123456789xXeE tfnuNaIy\\\n\tabc_$'];
26+let state = 20260101;
27+const rnd = n => { state = (state * 1103515245 + 12345) & 0x7fffffff; return state % n; };
28+const set = new Set(seeds);
29+for (let i = 0; i < 4000; i++) {
30+ const base = seeds[rnd(seeds.length)];
31+ let s = base;
32+ for (let k = 0, n = 1 + rnd(3); k < n; k++) {
33+ const pos = rnd(s.length + 1);
34+ switch (rnd(3)) {
35+ case 0: s = s.slice(0, pos) + alphabet[rnd(alphabet.length)] + s.slice(pos); break;
36+ case 1: s = s.slice(0, pos) + s.slice(pos + 1); break;
37+ default: s = s.slice(0, pos) + alphabet[rnd(alphabet.length)] + s.slice(pos + 1);
38+ }
39+ }
40+ set.add(s);
41+}
42+const inputs = [...set];
43+const lit = s => "'" + s.replaceAll("'", "''") + "'";
44+const cases = inputs.map(s => ({ e: `toJSON(fromJSON(${lit(s)}))` }));
45+const tmp = mkdtempSync(join(tmpdir(), "fj-"));
46+writeFileSync(join(tmp, "in.json"), JSON.stringify({ contexts: {}, cases }));
47+const out = execFileSync("dotnet", [join(here, "bin/Release/net9.0/runner.dll"), join(tmp, "in.json")], { maxBuffer: 1 << 28 }).toString("utf8").split("\n").filter(Boolean);
48+rmSync(tmp, { recursive: true });
49+if (out.length !== inputs.length) throw new Error("answer count");
50+const res = inputs.map((s, i) => {
51+ const r = JSON.parse(out[i]);
52+ if (r.err) {
53+ // An error while parsing the expression (e.g. the text broke the literal) is not about fromJSON.
54+ return r.err.t === "eval" ? { in: s, ok: false } : null;
55+ }
56+ return { in: s, ok: true, out: r.s };
57+}).filter(Boolean);
58+process.stdout.write(JSON.stringify(res));
M expr/json.go +70 -8
@@ -116,23 +116,49 @@ func (p *jsonParser) value(depth int) (Value, error) {
116116 case c == '-' || c == '.' || c >= '0' && c <= '9':
117117 return p.number()
118118 }
119+ if c := p.s[p.i]; c == ',' && depth == 0 {
120+ // A comma where the document should start is an undefined value,
121+ // which Json.NET reads as an empty string; whatever follows is ignored
122+ // like any text after the first value.
123+ return String(""), nil
124+ }
119125 start := p.i
126+ var v Value
120127 switch word := p.token(); word {
121128 case "true":
122- return Boolean(true), nil
129+ v = Boolean(true)
123130 case "false":
124- return Boolean(false), nil
131+ v = Boolean(false)
125132 case "null":
126- return Null{}, nil
133+ v = Null{}
127134 case "undefined":
128- return String(""), nil
135+ v = String("")
129136 case "NaN":
130- return Number(nan), nil
137+ v = Number(nan)
131138 case "Infinity":
132- return Number(posInf), nil
139+ v = Number(posInf)
140+ default:
141+ p.i = start
142+ return nil, p.unexpected()
133143 }
134- p.i = start
135- return nil, p.unexpected()
144+ if err := p.afterLiteral(); err != nil {
145+ return nil, err
146+ }
147+ return v, nil
148+}
149+
150+// afterLiteral checks the character that follows a word literal (true, null,
151+// NaN...): Json.NET only accepts a "/" there when it starts a comment, and
152+// comments are not ported, so any "/" is an error here. Anything else is left
153+// for the caller (white space, a comma, a closing bracket, or trailing text).
154+func (p *jsonParser) afterLiteral() error {
155+ if p.i >= len(p.s) || p.s[p.i] != '/' {
156+ return nil
157+ }
158+ if p.i+1 < len(p.s) && (p.s[p.i+1] == '/' || p.s[p.i+1] == '*') {
159+ return fmt.Errorf("comments are not supported (position %d in JSON)", p.i)
160+ }
161+ return p.unexpected()
136162 }
137163
138164 // number reads a number token: decimal with optional sign, fraction and
@@ -142,6 +168,9 @@ func (p *jsonParser) number() (Value, error) {
142168 start := p.i
143169 tok := p.token()
144170 if tok == "-Infinity" {
171+ if err := p.afterLiteral(); err != nil {
172+ return nil, err
173+ }
145174 return Number(math.Inf(-1)), nil
146175 }
147176 if len(tok) > 2 && tok[0] == '0' && (tok[1] == 'x' || tok[1] == 'X') {
@@ -153,6 +182,18 @@ func (p *jsonParser) number() (Value, error) {
153182 p.i = start
154183 return nil, fmt.Errorf("input string %q is not a valid number", tok)
155184 }
185+ // A non-negative number with a leading zero is octal when it has only
186+ // digits (010 is 8, 08 is an error) and an error unless the zero is
187+ // followed by ".", "e" or "E" (01.5, 012e1 and 00.5 fail). A negative
188+ // number is read as decimal whatever its zeros (-010 is -10).
189+ if len(tok) > 1 && tok[0] == '0' && tok[1] != '.' && tok[1] != 'e' && tok[1] != 'E' {
190+ v, ok := parseOctal64(tok[1:])
191+ if !ok {
192+ p.i = start
193+ return nil, fmt.Errorf("input string %q is not a valid number", tok)
194+ }
195+ return Number(v), nil
196+ }
156197 body := strings.TrimPrefix(tok, "-")
157198 if !isDecimalLiteral(body) {
158199 p.i = start
@@ -172,6 +213,27 @@ func (p *jsonParser) number() (Value, error) {
172213 return Number(f), nil
173214 }
174215
216+// parseOctal64 reads octal digits as Convert.ToInt64(s, 8) does: leading
217+// zeros are free, at most 64 significant bits, and a value of 2^63 or more
218+// wraps to a negative number (1777777777777777777777 is -1).
219+func parseOctal64(digits string) (float64, bool) {
220+ if digits == "" {
221+ return 0, false
222+ }
223+ var v uint64
224+ for i := 0; i < len(digits); i++ {
225+ c := digits[i]
226+ if c < '0' || c > '7' {
227+ return 0, false
228+ }
229+ if v>>61 != 0 {
230+ return 0, false // the next shift would leave 64 bits
231+ }
232+ v = v<<3 | uint64(c-'0')
233+ }
234+ return float64(int64(v)), true
235+}
236+
175237 // isBigInteger reports whether s is only digits.
176238 func isBigInteger(s string) bool {
177239 for i := 0; i < len(s); i++ {
@@ -116,23 +116,49 @@ func (p *jsonParser) value(depth int) (Value, error) {
116 case c == '-' || c == '.' || c >= '0' && c <= '9':116 case c == '-' || c == '.' || c >= '0' && c <= '9':
117 return p.number()117 return p.number()
118 }118 }
119+ if c := p.s[p.i]; c == ',' && depth == 0 {
120+ // A comma where the document should start is an undefined value,
121+ // which Json.NET reads as an empty string; whatever follows is ignored
122+ // like any text after the first value.
123+ return String(""), nil
124+ }
119 start := p.i125 start := p.i
126+ var v Value
120 switch word := p.token(); word {127 switch word := p.token(); word {
121 case "true":128 case "true":
122- return Boolean(true), nil129+ v = Boolean(true)
123 case "false":130 case "false":
124- return Boolean(false), nil131+ v = Boolean(false)
125 case "null":132 case "null":
126- return Null{}, nil133+ v = Null{}
127 case "undefined":134 case "undefined":
128- return String(""), nil135+ v = String("")
129 case "NaN":136 case "NaN":
130- return Number(nan), nil137+ v = Number(nan)
131 case "Infinity":138 case "Infinity":
132- return Number(posInf), nil139+ v = Number(posInf)
140+ default:
141+ p.i = start
142+ return nil, p.unexpected()
133 }143 }
134- p.i = start144+ if err := p.afterLiteral(); err != nil {
135- return nil, p.unexpected()145+ return nil, err
146+ }
147+ return v, nil
148+}
149+
150+// afterLiteral checks the character that follows a word literal (true, null,
151+// NaN...): Json.NET only accepts a "/" there when it starts a comment, and
152+// comments are not ported, so any "/" is an error here. Anything else is left
153+// for the caller (white space, a comma, a closing bracket, or trailing text).
154+func (p *jsonParser) afterLiteral() error {
155+ if p.i >= len(p.s) || p.s[p.i] != '/' {
156+ return nil
157+ }
158+ if p.i+1 < len(p.s) && (p.s[p.i+1] == '/' || p.s[p.i+1] == '*') {
159+ return fmt.Errorf("comments are not supported (position %d in JSON)", p.i)
160+ }
161+ return p.unexpected()
136 }162 }
137 163
138 // number reads a number token: decimal with optional sign, fraction and164 // number reads a number token: decimal with optional sign, fraction and
@@ -142,6 +168,9 @@ func (p *jsonParser) number() (Value, error) {
142 start := p.i168 start := p.i
143 tok := p.token()169 tok := p.token()
144 if tok == "-Infinity" {170 if tok == "-Infinity" {
171+ if err := p.afterLiteral(); err != nil {
172+ return nil, err
173+ }
145 return Number(math.Inf(-1)), nil174 return Number(math.Inf(-1)), nil
146 }175 }
147 if len(tok) > 2 && tok[0] == '0' && (tok[1] == 'x' || tok[1] == 'X') {176 if len(tok) > 2 && tok[0] == '0' && (tok[1] == 'x' || tok[1] == 'X') {
@@ -153,6 +182,18 @@ func (p *jsonParser) number() (Value, error) {
153 p.i = start182 p.i = start
154 return nil, fmt.Errorf("input string %q is not a valid number", tok)183 return nil, fmt.Errorf("input string %q is not a valid number", tok)
155 }184 }
185+ // A non-negative number with a leading zero is octal when it has only
186+ // digits (010 is 8, 08 is an error) and an error unless the zero is
187+ // followed by ".", "e" or "E" (01.5, 012e1 and 00.5 fail). A negative
188+ // number is read as decimal whatever its zeros (-010 is -10).
189+ if len(tok) > 1 && tok[0] == '0' && tok[1] != '.' && tok[1] != 'e' && tok[1] != 'E' {
190+ v, ok := parseOctal64(tok[1:])
191+ if !ok {
192+ p.i = start
193+ return nil, fmt.Errorf("input string %q is not a valid number", tok)
194+ }
195+ return Number(v), nil
196+ }
156 body := strings.TrimPrefix(tok, "-")197 body := strings.TrimPrefix(tok, "-")
157 if !isDecimalLiteral(body) {198 if !isDecimalLiteral(body) {
158 p.i = start199 p.i = start
@@ -172,6 +213,27 @@ func (p *jsonParser) number() (Value, error) {
172 return Number(f), nil213 return Number(f), nil
173 }214 }
174 215
216+// parseOctal64 reads octal digits as Convert.ToInt64(s, 8) does: leading
217+// zeros are free, at most 64 significant bits, and a value of 2^63 or more
218+// wraps to a negative number (1777777777777777777777 is -1).
219+func parseOctal64(digits string) (float64, bool) {
220+ if digits == "" {
221+ return 0, false
222+ }
223+ var v uint64
224+ for i := 0; i < len(digits); i++ {
225+ c := digits[i]
226+ if c < '0' || c > '7' {
227+ return 0, false
228+ }
229+ if v>>61 != 0 {
230+ return 0, false // the next shift would leave 64 bits
231+ }
232+ v = v<<3 | uint64(c-'0')
233+ }
234+ return float64(int64(v)), true
235+}
236+
175 // isBigInteger reports whether s is only digits.237 // isBigInteger reports whether s is only digits.
176 func isBigInteger(s string) bool {238 func isBigInteger(s string) bool {
177 for i := 0; i < len(s); i++ {239 for i := 0; i < len(s); i++ {
M expr/json_test.go +64 -1
@@ -46,7 +46,7 @@ func TestFromJSONValid(t *testing.T) {
4646 {`[1,]`, "[\n 1\n]"},
4747 {`[,1]`, "[\n \"\",\n 1\n]"},
4848 {`[1,,2]`, "[\n 1,\n \"\",\n 2\n]"},
49- {"01", "1"}, {"1.", "1"}, {".5", "0.5"}, {"-.5", "-0.5"}, {"1.e2", "100"},
49+ {"1.", "1"}, {".5", "0.5"}, {"-.5", "-0.5"}, {"1.e2", "100"},
5050 {"0x10", "16"}, {"0X1f", "31"},
5151 {"NaN", "NaN"}, {"Infinity", "Infinity"}, {"-Infinity", "-Infinity"},
5252 {"undefined", `""`},
@@ -66,6 +66,69 @@ func TestFromJSONValid(t *testing.T) {
6666 }
6767 }
6868
69+// TestFromJSONLeadingZeros: Json.NET reads a non-negative integer with a
70+// leading zero as octal (Convert.ToInt64(s, 8)), a negative one as decimal, and
71+// rejects a leading zero before a fraction or an exponent. Established with the
72+// runner's code.
73+func TestFromJSONLeadingZeros(t *testing.T) {
74+ for _, tc := range []struct {
75+ src string
76+ want string // ToJSON, or "" for an error
77+ }{
78+ {"010", "8"}, {"050", "40"}, {"00", "0"}, {"007", "7"}, {"0777", "511"}, {"00777", "511"},
79+ {"08", ""}, {"09", ""}, {"01.5", ""}, {"012e1", ""}, {"00.5", ""}, {"010.0", ""}, {"00e1", ""}, {"010e", ""},
80+ {"0.5", "0.5"}, {"0e1", "0"}, {"0E1", "0"}, {"0.", "0"}, {"0.e1", "0"}, {"0e", ""},
81+ {"-010", "-10"}, {"-09", "-9"}, {"-00", "0"}, {"-0777", "-777"}, {"-01.5", "-1.5"}, {"-012e1", "-120"},
82+ {"[010]", "[\n 8\n]"}, {"[08]", ""}, {`{"a":010}`, "{\n \"a\": 8\n}"}, {`{"a":08}`, ""}, {`{"a":01.5}`, ""},
83+ // 64-bit wrap of Convert.ToInt64.
84+ {"0777777777777777777777", "9.22337203685478E+18"},
85+ {"01777777777777777777777", "-1"},
86+ {"07777777777777777777777", ""},
87+ {"0000000000000000000012345", "5349"},
88+ {"0000000000000000000012349", ""},
89+ } {
90+ v, err := FromJSON([]byte(tc.src))
91+ switch {
92+ case tc.want == "" && err == nil:
93+ t.Errorf("FromJSON(%q) = %s, want an error", tc.src, ToJSON(v))
94+ case tc.want != "" && err != nil:
95+ t.Errorf("FromJSON(%q): %v", tc.src, err)
96+ case err == nil && ToJSON(v) != tc.want:
97+ t.Errorf("FromJSON(%q) = %s, want %s", tc.src, ToJSON(v), tc.want)
98+ }
99+ }
100+}
101+
102+// TestFromJSONSlashAndComma: a "/" after a literal is an error when it could
103+// start a comment (comments are not ported, so it fails consistently), as it is
104+// for Json.NET after null, true, false, NaN and Infinity and between the values
105+// of an array or object; after a number or string at the top level the text is
106+// ignored. A comma where the document should start is an undefined value.
107+func TestFromJSONSlashAndComma(t *testing.T) {
108+ for _, tc := range []struct {
109+ src string
110+ want string // ToJSON, or "" for an error
111+ }{
112+ {"null/x", ""}, {"null/", ""}, {"true/x", ""}, {"false/x", ""}, {"NaN/x", ""}, {"Infinity/x", ""}, {"-Infinity/x", ""},
113+ {"undefined/x", ""}, {"null//c", ""}, {"null/*c*/", ""}, {"NaN/*c*/", ""}, {"[null/x]", ""}, {"[null/*c*/]", ""}, {`{"a":null/x}`, ""},
114+ {"[1/2]", ""}, {"[1 /2]", ""}, {`{"a":1/2}`, ""}, {"[1/*c*/,2]", ""}, {"[1//c\n,2]", ""},
115+ {"null /x", "null"}, {"1/x", "1"}, {"1/", "1"}, {"1 /", "1"}, {"1.5/x", "1.5"}, {`"a"/x`, `"a"`}, {"[null,1]/x", "[\n null,\n 1\n]"},
116+ {",", `""`}, {",1", `""`}, {",,1", `""`}, {",x", `""`}, {" ,1", `""`}, {`,"a"`, `""`}, {",]", `""`},
117+ {"[,1]", "[\n \"\",\n 1\n]"}, {"[1,,2]", "[\n 1,\n \"\",\n 2\n]"}, {"[,]", "[\n \"\"\n]"},
118+ {"{,}", ""}, {`{"a":,1}`, ""}, {`{"a":1,,"b":2}`, ""},
119+ } {
120+ v, err := FromJSON([]byte(tc.src))
121+ switch {
122+ case tc.want == "" && err == nil:
123+ t.Errorf("FromJSON(%q) = %s, want an error", tc.src, ToJSON(v))
124+ case tc.want != "" && err != nil:
125+ t.Errorf("FromJSON(%q): %v", tc.src, err)
126+ case err == nil && ToJSON(v) != tc.want:
127+ t.Errorf("FromJSON(%q) = %s, want %s", tc.src, ToJSON(v), tc.want)
128+ }
129+ }
130+}
131+
69132 func TestFromJSONInvalid(t *testing.T) {
70133 for _, in := range []string{
71134 "", " ", "{", "}", "[", "]", `{"a"`, `{"a":`, `{"a":1`, `{,}`, `{"a" 1}`, `[1 2]`,
@@ -46,7 +46,7 @@ func TestFromJSONValid(t *testing.T) {
46 {`[1,]`, "[\n 1\n]"},46 {`[1,]`, "[\n 1\n]"},
47 {`[,1]`, "[\n \"\",\n 1\n]"},47 {`[,1]`, "[\n \"\",\n 1\n]"},
48 {`[1,,2]`, "[\n 1,\n \"\",\n 2\n]"},48 {`[1,,2]`, "[\n 1,\n \"\",\n 2\n]"},
49- {"01", "1"}, {"1.", "1"}, {".5", "0.5"}, {"-.5", "-0.5"}, {"1.e2", "100"},49+ {"1.", "1"}, {".5", "0.5"}, {"-.5", "-0.5"}, {"1.e2", "100"},
50 {"0x10", "16"}, {"0X1f", "31"},50 {"0x10", "16"}, {"0X1f", "31"},
51 {"NaN", "NaN"}, {"Infinity", "Infinity"}, {"-Infinity", "-Infinity"},51 {"NaN", "NaN"}, {"Infinity", "Infinity"}, {"-Infinity", "-Infinity"},
52 {"undefined", `""`},52 {"undefined", `""`},
@@ -66,6 +66,69 @@ func TestFromJSONValid(t *testing.T) {
66 }66 }
67 }67 }
68 68
69+// TestFromJSONLeadingZeros: Json.NET reads a non-negative integer with a
70+// leading zero as octal (Convert.ToInt64(s, 8)), a negative one as decimal, and
71+// rejects a leading zero before a fraction or an exponent. Established with the
72+// runner's code.
73+func TestFromJSONLeadingZeros(t *testing.T) {
74+ for _, tc := range []struct {
75+ src string
76+ want string // ToJSON, or "" for an error
77+ }{
78+ {"010", "8"}, {"050", "40"}, {"00", "0"}, {"007", "7"}, {"0777", "511"}, {"00777", "511"},
79+ {"08", ""}, {"09", ""}, {"01.5", ""}, {"012e1", ""}, {"00.5", ""}, {"010.0", ""}, {"00e1", ""}, {"010e", ""},
80+ {"0.5", "0.5"}, {"0e1", "0"}, {"0E1", "0"}, {"0.", "0"}, {"0.e1", "0"}, {"0e", ""},
81+ {"-010", "-10"}, {"-09", "-9"}, {"-00", "0"}, {"-0777", "-777"}, {"-01.5", "-1.5"}, {"-012e1", "-120"},
82+ {"[010]", "[\n 8\n]"}, {"[08]", ""}, {`{"a":010}`, "{\n \"a\": 8\n}"}, {`{"a":08}`, ""}, {`{"a":01.5}`, ""},
83+ // 64-bit wrap of Convert.ToInt64.
84+ {"0777777777777777777777", "9.22337203685478E+18"},
85+ {"01777777777777777777777", "-1"},
86+ {"07777777777777777777777", ""},
87+ {"0000000000000000000012345", "5349"},
88+ {"0000000000000000000012349", ""},
89+ } {
90+ v, err := FromJSON([]byte(tc.src))
91+ switch {
92+ case tc.want == "" && err == nil:
93+ t.Errorf("FromJSON(%q) = %s, want an error", tc.src, ToJSON(v))
94+ case tc.want != "" && err != nil:
95+ t.Errorf("FromJSON(%q): %v", tc.src, err)
96+ case err == nil && ToJSON(v) != tc.want:
97+ t.Errorf("FromJSON(%q) = %s, want %s", tc.src, ToJSON(v), tc.want)
98+ }
99+ }
100+}
101+
102+// TestFromJSONSlashAndComma: a "/" after a literal is an error when it could
103+// start a comment (comments are not ported, so it fails consistently), as it is
104+// for Json.NET after null, true, false, NaN and Infinity and between the values
105+// of an array or object; after a number or string at the top level the text is
106+// ignored. A comma where the document should start is an undefined value.
107+func TestFromJSONSlashAndComma(t *testing.T) {
108+ for _, tc := range []struct {
109+ src string
110+ want string // ToJSON, or "" for an error
111+ }{
112+ {"null/x", ""}, {"null/", ""}, {"true/x", ""}, {"false/x", ""}, {"NaN/x", ""}, {"Infinity/x", ""}, {"-Infinity/x", ""},
113+ {"undefined/x", ""}, {"null//c", ""}, {"null/*c*/", ""}, {"NaN/*c*/", ""}, {"[null/x]", ""}, {"[null/*c*/]", ""}, {`{"a":null/x}`, ""},
114+ {"[1/2]", ""}, {"[1 /2]", ""}, {`{"a":1/2}`, ""}, {"[1/*c*/,2]", ""}, {"[1//c\n,2]", ""},
115+ {"null /x", "null"}, {"1/x", "1"}, {"1/", "1"}, {"1 /", "1"}, {"1.5/x", "1.5"}, {`"a"/x`, `"a"`}, {"[null,1]/x", "[\n null,\n 1\n]"},
116+ {",", `""`}, {",1", `""`}, {",,1", `""`}, {",x", `""`}, {" ,1", `""`}, {`,"a"`, `""`}, {",]", `""`},
117+ {"[,1]", "[\n \"\",\n 1\n]"}, {"[1,,2]", "[\n 1,\n \"\",\n 2\n]"}, {"[,]", "[\n \"\"\n]"},
118+ {"{,}", ""}, {`{"a":,1}`, ""}, {`{"a":1,,"b":2}`, ""},
119+ } {
120+ v, err := FromJSON([]byte(tc.src))
121+ switch {
122+ case tc.want == "" && err == nil:
123+ t.Errorf("FromJSON(%q) = %s, want an error", tc.src, ToJSON(v))
124+ case tc.want != "" && err != nil:
125+ t.Errorf("FromJSON(%q): %v", tc.src, err)
126+ case err == nil && ToJSON(v) != tc.want:
127+ t.Errorf("FromJSON(%q) = %s, want %s", tc.src, ToJSON(v), tc.want)
128+ }
129+ }
130+}
131+
69 func TestFromJSONInvalid(t *testing.T) {132 func TestFromJSONInvalid(t *testing.T) {
70 for _, in := range []string{133 for _, in := range []string{
71 "", " ", "{", "}", "[", "]", `{"a"`, `{"a":`, `{"a":1`, `{,}`, `{"a" 1}`, `[1 2]`,134 "", " ", "{", "}", "[", "]", `{"a"`, `{"a":`, `{"a":1`, `{,}`, `{"a" 1}`, `[1 2]`,
A expr/testdata/fromjson_cases.json +1 -0
@@ -0,0 +1,1 @@
1+[{"in":"null","ok":true,"out":"null"},{"in":"true","ok":true,"out":"true"},{"in":"false","ok":true,"out":"false"},{"in":"NaN","ok":true,"out":"NaN"},{"in":"Infinity","ok":true,"out":"Infinity"},{"in":"-Infinity","ok":true,"out":"-Infinity"},{"in":"undefined","ok":true,"out":"\"\""},{"in":"0","ok":true,"out":"0"},{"in":"-0","ok":true,"out":"0"},{"in":"010","ok":true,"out":"8"},{"in":"08","ok":false},{"in":"0x1F","ok":true,"out":"31"},{"in":"1.5e3","ok":true,"out":"1500"},{"in":".5","ok":true,"out":"0.5"},{"in":"5.","ok":true,"out":"5"},{"in":"12345678901234567890","ok":true,"out":"1.23456789012346E+19"},{"in":"\"a\"","ok":true,"out":"\"a\""},{"in":"'a'","ok":true,"out":"\"a\""},{"in":"\"\\u00e9\\ud83d\\ude00\"","ok":true,"out":"\"é😀\""},{"in":"\"\\ud800\"","ok":true,"out":"\"�\""},{"in":"[]","ok":true,"out":"[]"},{"in":"{}","ok":true,"out":"{}"},{"in":"[1,2,3]","ok":true,"out":"[\n 1,\n 2,\n 3\n]"},{"in":"[1,]","ok":true,"out":"[\n 1\n]"},{"in":"[,1]","ok":true,"out":"[\n \"\",\n 1\n]"},{"in":"[1,,2]","ok":true,"out":"[\n 1,\n \"\",\n 2\n]"},{"in":"{\"a\":1}","ok":true,"out":"{\n \"a\": 1\n}"},{"in":"{\"a\":1,\"A\":2}","ok":true,"out":"{\n \"a\": 2\n}"},{"in":"{a:1}","ok":true,"out":"{\n \"a\": 1\n}"},{"in":"{'a':'b'}","ok":true,"out":"{\n \"a\": \"b\"\n}"},{"in":"{\"a\":[1,{\"b\":null}]}","ok":true,"out":"{\n \"a\": [\n 1,\n {\n \"b\": null\n }\n ]\n}"},{"in":"[[[1]]]","ok":true,"out":"[\n [\n [\n 1\n ]\n ]\n]"},{"in":"[null,true,false]","ok":true,"out":"[\n null,\n true,\n false\n]"},{"in":"1 2","ok":true,"out":"1"},{"in":"[] x","ok":true,"out":"[]"},{"in":",","ok":true,"out":"\"\""},{"in":",1","ok":true,"out":"\"\""},{"in":"/*c*/1","ok":true,"out":"\"c\""},{"in":"1/*c*/","ok":true,"out":"1"},{"in":"[1/*c*/,2]","ok":true,"out":"[\n 1,\n 2\n]"},{"in":"null/x","ok":false},{"in":"new Date(1)","ok":true,"out":"\"new Date(\\n 1\\n)\""},{"in":"[010,08,-010]","ok":false},{"in":"{\"a\":010}","ok":true,"out":"{\n \"a\": 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first / last row
/
filter the list; on Files, find a file anywhere in the repository (esc clears, enter opens the best match)
b
switch branch or tag
g s g f g c g b g m g i g r g a
tabs: summary, files, commits, branches & tags, merge requests, issues, releases, actions (when available)
g h
home
w
wide mode: use the whole width of the screen, or not (remembered)
y
copy a permalink pinned to the commit
d u x
diff: split / unified / collapse or expand all
e E
diff: the whole file in view / every file, with the lines the hunks hide
n
merge request: next note in the diff
esc
close a dialog, leave a field

Branches 1

Tags 3

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