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feat(symphony): port the partial JSON parser from the old tool crate - #2786
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Included review availability: This review used your included allowance. 2 included reviews remain after this review. Your included PR review attempts over the past 7 days set your current allowance at 5 reviews per hour. 📝 SummarySummary by CodeRabbit
WalkthroughThe change exposes a JSON module with a configurable parser for complete or incomplete JSON input. The parser returns a value and consumed byte offset, applies a nesting-depth limit, and provides a check for complete JSON input. ChangesPartial JSON Parsing
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Merge Risk: ⚪ Minimal · up to No merge-blocking issue remains in the reviewed change; it is ready for normal checks. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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| fn literal(&mut self, expected: &'static str, value: Value) -> Parsed<Value> { | ||
| let mut word = String::new(); | ||
| while let Some(letter) = self.peek().filter(char::is_ascii_alphabetic) { | ||
| word.push(letter); | ||
| self.advance(); | ||
| } | ||
| if word == expected || (self.allow_incomplete && expected.starts_with(&word)) { |
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🟡 Nit: The module doc says behaviour is unchanged, but merging the literal routines changed two things the parity review should know about:
-
Bytes consumed by a rejected word. The original
parse_bool/parse_nullfirst read ahead on a cloned iterator (temp_chars, capped at 5/4 bytes) and returnedErrwithout advancing when that word was not a valid prefix. This version advances over the whole word before it rejects it. Inside a container the error is swallowed in prefix mode andcursor.positionkeeps those bytes:[1, truex]→ original([1], 4), port([1], 9){"a": tx}→ original stops after"a":(6), port aftertx(8)
The old streaming caller (
tool_parser/src/parsers/helpers.rs,cursor + safe_end_idxin the undeclared-name path) uses this count to decide what to emit as content and where to resume. A port that relies onconsumedwill therefore act differently on malformed literals. -
is_ascii_alphabeticvsis_alphabetic. The original collected Unicode-alphabetic letters, so{"a": trueé}readtrueé, rejected it, and gave{"a": null}. This version stops até, acceptstrue, and gives{"a": true}.
Both only matter for malformed input, but the doc says the parity review should find every divergence. Either keep the original's validate-before-consume and is_alphabetic, or add these to the module doc's list. literals_and_their_prefixes_read_as_the_literal_in_prefix_mode only checks .0 for [1, truex], so it doesn't catch the change in the consumed count.
| /// With `allow_partial_strings` an unfinished string is returned as written; without it the | ||
| /// parse stops before the string, and an object leaves out the key whose value it was, which | ||
| /// is how an argument stream avoids emitting a string fragment that may still grow. |
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🟡 Nit: "the parse stops before the string" holds for the returned value, not for the byte count. The cursor still walks to the end of the unfinished string before string() fails, so consumed includes it. Your own test shows this: {"name": " returns consumed == 10, the full input with the opening quote, and {"name": "te returns 12. Because mod.rs describes the count as "how many bytes it understood", and the upcoming assembler builds on it, a reader could take input[consumed..] as the part not yet understood. That would silently drop the pending string. Suggest stating what actually happens:
| /// With `allow_partial_strings` an unfinished string is returned as written; without it the | |
| /// parse stops before the string, and an object leaves out the key whose value it was, which | |
| /// is how an argument stream avoids emitting a string fragment that may still grow. | |
| /// With `allow_partial_strings` an unfinished string is returned as written; without it the | |
| /// value leaves the string out, and an object leaves out the key whose value it was, which | |
| /// is how an argument stream avoids emitting a string fragment that may still grow. The bytes | |
| /// of the left-out string still count as consumed. |
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Review on behalf of the maintainers (rule 17 checklist, rules 0, 20 to 23 and 27), at head 6ee23cc, after reading json/partial.rs and json/mod.rs against crates/tool_parser/src/partial_json.rs and parsers/helpers.rs::is_complete_json at 897ef9a, and running the two parsers against each other.
Scope (rules 20 and 27). crates/symphony/src/json/{mod,partial}.rs and one line in lib.rs; Cargo.toml and Cargo.lock unchanged, so no new dependency and no SMG crate but openai-protocol. The module doc names the origin (partial_json.rs at 897ef9a) and lists what changed. Holds.
Commit. One, conventional subject, the author's Signed-off-by, Co-authored-by: Chang Su, no AI trailer.
Gates. Run here on 6ee23cc in a clean worktree, exit codes captured: cargo +nightly fmt --all -- --check 0; cargo +1.98.0 clippy -p smg-symphony --all-targets -- -D warnings 0; cargo +1.98.0 test -p smg-symphony 0 (24 passed); RUSTDOCFLAGS=-D warnings cargo +1.98.0 doc -p smg-symphony --no-deps 0.
Drift check. By reading: value, object, array, string, unicode_escape, number and the depth checks are the original's logic line for line (the None/_ arms of the original collapse into one _ if allow_incomplete arm, the exponent is pushed as e whichever case the input had, which the float parse does not see); is_complete is the original is_complete_json verbatim (IgnoredAny then de.end()). By running: a scratch program outside both repositories (rule 27 keeps it out of the crate) parsed every character-boundary prefix of 36 inputs (nested values, escapes, unicode, numbers in every form, trailing commas, malformed objects, literal words and their misspellings) with both parsers in both allow_incomplete and both allow_partial_strings modes, and compared is_complete on each prefix: 2192 comparisons, 20 differ, all in one place.
One request: the literal routine changes behaviour, and the doc says behaviour did not change. The original parse_bool/parse_null first scan ahead over char::is_alphabetic letters, capped at the literal's length (5 or 4), validate the word (exact, or a prefix in prefix mode) and only then consume; on an invalid word they return Err with nothing consumed. literal (partial.rs:342-353) consumes every is_ascii_alphabetic letter and validates afterwards. Three consequences, each shown by the run:
- an invalid word is consumed:
[1, truexgives[1]from both, but the original reports 4 bytes consumed (the word untouched) and the port 9; the same for{"a": truefoo(6 vs 13) and{"x": nulL(6 vs 10). The assembler built on this readsconsumedas "understood so far", so the port would treat garbage as consumed where the old parser waited; - a non-ASCII letter ends the scan early:
[1, truéis[1]for the original (the wordtruéis no prefix oftrue) and[1, true]with 7 bytes consumed for the port, becauseéis not ASCII alphabetic andtrupasses as a prefix; - the original's cap (
nulLis scanned whole because it is four letters,truefoois cut totruef) is gone; with the two points above it is what makes the results differ, not a difference on its own.
Since the module doc says the ported parser must reproduce the old one until the fixtures judge otherwise, the fix that fits is the original's order: scan ahead over is_alphabetic, capped at the literal's length, validate, then consume. If the new order is wanted instead, the module doc's list of what changed has to name it and its three effects. Either way, please pin [1, truex (value and bytes consumed), [1, trué and {"x": nulL as tests, since the sweep in every_cut_of_a_value_parses_in_prefix_mode_without_consuming_past_the_cut checks the bound on consumed, not its value, and the existing literal test checks values only.
Readability (rules 21 to 23). The doc says what the parser does and names the choices worth a second look; Cursor and its methods read as the original did with the duplication of parse_bool/parse_null removed, which is the right instinct and the place the drift crept in; tests are sentences.
Requesting changes for the literal routine.
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Review on behalf of the maintainers (rule 17 checklist, rules 0, 20 to 23 and 27), at head 1302a4d: the fix commit fix(symphony): check a literal before consuming it, as the original does on top of the reviewed 6ee23cc.
Scope (rules 20 and 27). crates/symphony/src/json/{mod,partial}.rs and one line in lib.rs; Cargo.toml and Cargo.lock unchanged. Holds.
Commits. Two, conventional subjects, each with the author's Signed-off-by and Co-authored-by: Chang Su, no AI trailer.
Gates. Run here on 1302a4d in a clean worktree, exit codes captured: cargo +nightly fmt --all -- --check 0; cargo +1.98.0 clippy -p smg-symphony --all-targets -- -D warnings 0; cargo +1.98.0 test -p smg-symphony 0 (25 passed); RUSTDOCFLAGS=-D warnings cargo +1.98.0 doc -p smg-symphony --no-deps 0.
The request, verified. literal (partial.rs:351-379) now looks ahead over char::is_alphabetic letters, byte-counted up to the literal's length (BOOLEAN_LENGTH = 5 for the booleans, 4 for null, the original's caps), accepts the word when it is the literal or, in prefix mode, a prefix of it, and only then consumes the run of letters and checks again. That is parse_bool/parse_null's order and character class; dispatching by the first letter to one expected literal is equivalent, since a word starting with t cannot be a prefix of false. The fn doc states the order and why. Pinned: [1, truex and [1, truex] give ([1], 4), [1, trué gives ([1], 4), and truex at the top level is Invalid("invalid literal").
Differential run, rerun against this head. The same scratch program as in the previous review (every character-boundary prefix of 36 inputs, both allow_incomplete and both allow_partial_strings modes, is_complete on each prefix) comparing the original tool_parser::partial_json::PartialJson at 897ef9a with symphony::json::PartialJson at 1302a4d: 2192 comparisons, 0 differences. The module doc's claim that behaviour did not change holds again, and that run is the proof the Test Plan can cite.
Readability. The look-ahead and the consume loop read as two steps with the reason between them; the constant names the cap; the new test is a sentence and checks both value and bytes consumed.
Approved. Rule 25 at merge time: every check green on the head against main, with the GPU lanes skipped by the filter counting as pass.
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Inline comments:
Review comments at @crates/symphony/src/json/partial.rs:
- Around line 359-360: Update the word-consuming logic around `letter`, `word`,
and `longest` to check the complete alphabetic literal before advancing the
parser cursor, so `[1, falsex]` is rejected at the start of the invalid word
rather than returning a partial array with an advanced offset. Add a regression
test asserting the reported offset for this input.
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crates/symphony/src/json/partial.rs
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The first piece of the streaming JSON parser, copied from `crates/tool_parser/src/partial_json.rs` under ground rule 27: a parser that reads as much of a JSON value as the input contains and returns the value determined so far with the bytes consumed, on a character boundary, so an argument stream can emit prefix-stable fragments. Behaviour is kept so that the ported parser reproduces the old one until bellwether's fixtures judge otherwise; the module doc names the choices worth a second look (lenient escapes, U+FFFD for an unfinished `\u`, `0` for an unreadable number, literal prefixes, trailing commas). What changed: an error type of its own, `is_complete` as a function of the module, one literal routine for `true`, `false` and `null`, names and documentation. The old tests are carried over and a sweep over every cut of a sample value is added. Signed-off-by: Simo Lin <25425177+slin1237@users.noreply.github.com> Co-authored-by: Chang Su <8605658+CatherineSue@users.noreply.github.com> Co-authored-by: Praneth Paruchuri <pranethparuchuri@gmail.com>
Alex ran the port against the original over every prefix of 36 inputs: 2192 comparisons, 20 differences, all in the literal routine. The original looks ahead over Unicode letters, byte-counted up to the literal's length, and rejects the word before consuming anything; the port consumed ASCII letters first. So `[1, truex` consumed nine bytes instead of four, and `[1, trué` read as `[1, true]` instead of `[1]`. The original order and character class are restored, and the three inputs are pinned as tests. Signed-off-by: Simo Lin <25425177+slin1237@users.noreply.github.com> Co-authored-by: Chang Su <8605658+CatherineSue@users.noreply.github.com> Co-authored-by: Praneth Paruchuri <pranethparuchuri@gmail.com>
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| /// The word is checked before anything is consumed, looking ahead over letters up to `longest` | ||
| /// bytes, the length of the longest literal of the kind, so a word that is no literal leaves the | ||
| /// position where it was and the enclosing value closes before it. Only then is the whole run | ||
| /// of letters consumed and checked again. This is the original's order and character class | ||
| /// (Unicode letters, byte-counted), kept so that `[1, truex` consumes four bytes and `[1, trué` | ||
| /// is `[1]`, as before. |
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🟡 Nit: The claim that "a word that is no literal leaves the position where it was" holds only when the word fails inside the look-ahead. The look-ahead stops at longest bytes, and false and null each fill that limit exactly, so a whole literal followed by more letters passes the first check. The second pass then consumes the whole word before it rejects it:
[1, falsex: the look-ahead seesfalseand accepts it. The consuming pass readsfalsex, rejects it, and the array returns([1], 10), not([1], 4).[1, nullxgives([1], 9).{"a": nullx}gives{"a": null}, with the cursor pastnullx.
I traced the original's parse_bool/parse_null and they do the same thing, so the behaviour is right for parity. I'd keep it, which also means not applying the suggestion at line 360 to change it. But this doc comment, and the test name a_word_that_is_no_literal_is_left_unconsumed_…, tell the reader the opposite. mod.rs describes consumed as "how many bytes it understood", and the assembler will rely on that. Suggest stating the exception, and pinning prefix("[1, falsex") == (json!([1]), 10) and prefix("[1, nullx") == (json!([1]), 9) in the test, so a later "fix" can't quietly break parity:
| /// The word is checked before anything is consumed, looking ahead over letters up to `longest` | |
| /// bytes, the length of the longest literal of the kind, so a word that is no literal leaves the | |
| /// position where it was and the enclosing value closes before it. Only then is the whole run | |
| /// of letters consumed and checked again. This is the original's order and character class | |
| /// (Unicode letters, byte-counted), kept so that `[1, truex` consumes four bytes and `[1, trué` | |
| /// is `[1]`, as before. | |
| /// The word is checked before anything is consumed, looking ahead over letters up to `longest` | |
| /// bytes, the length of the longest literal of the kind, so a word that is no literal within | |
| /// that look-ahead (`truex`, `trué`) leaves the position where it was and the enclosing value | |
| /// closes before it. Only then is the whole run of letters consumed and checked again; a word | |
| /// that fails only this second check, a whole `false` or `null` followed by more letters, has | |
| /// already been consumed, so `[1, falsex` is `[1]` with ten bytes consumed. This is the | |
| /// original's order and character class (Unicode letters, byte-counted), kept so that | |
| /// `[1, truex` consumes four bytes and `[1, trué` is `[1]`, as before. |
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Review on behalf of the maintainers (rule 17 checklist, rules 0, 20 to 23 and 27), at head c1678f7: the two commits amended with the original authors' trailers under the new sentence of rule 27.
Same tree as the approved 1302a4d. git diff 1302a4d0 c1678f78 is empty, so the gates (fmt, clippy, test with 25 passed, doc, all 0) and the differential run (2192 comparisons, 0 differences) of the previous review apply to this head unchanged.
Trailers, checked against the original's history. git log --follow on crates/tool_parser/src/partial_json.rs at 897ef9a names three people: Chang Su (5 commits), the maintainer (3, under two addresses) and Praneth Paruchuri (1). Both commits carry Co-authored-by: Chang Su <8605658+CatherineSue@users.noreply.github.com> and Co-authored-by: Praneth Paruchuri <pranethparuchuri@gmail.com>, one trailer per person at the canonical address, with the maintainer as the commit author and the author's Signed-off-by; no AI trailer. That is the full set rule 27 asks for ("every author in the original file's history", the commit author not listed twice), and the PR body's Authorship line says how it was found.
Scope. Unchanged: crates/symphony/src/json/{mod,partial}.rs and one line in lib.rs; no dependency change.
Checks at review time. pre-commit fails on this head: codespell flags the deliberate literal prefixes in the tests, partial.rs:515 and :526 ("tru") and :529 ("fals"), as misspellings of "true"/"false". Not a typo and not the trailers, but rule 25 needs every check green, so the head cannot merge as it is; a // codespell:ignore tru,fals on those lines (or the inputs spelled as the test already explains them) clears it, and I re-approve the next head on sight since the tree change is a comment. build-wheel, unit-tests and Claude PR Review were pending; the rest pass.
Approved for the authorship change; the merge waits on the codespell fix under rule 25.
`"tru"` and `"fals"` in the literal tests are prefixes of `true` and `false` on purpose; the inline ignore keeps the pre-commit check green without adding the words to the repository's ignore list. Signed-off-by: Simo Lin <25425177+slin1237@users.noreply.github.com> Co-authored-by: Chang Su <8605658+CatherineSue@users.noreply.github.com> Co-authored-by: Praneth Paruchuri <pranethparuchuri@gmail.com>
CodeRabbit found the one case the original's capped look-ahead let through: `false` followed by letters passed the five-byte check, was consumed, and was only then rejected, so `[1, falsex]` came back as `([1], 10)` while `[1, truex]` came back as `([1], 4)`. The literal routine now looks at the whole run of letters before consuming anything, so every such word leaves the cursor where it was. This is the one behaviour change of the port, and the module doc now says so instead of claiming none; `[1, falsex]` and `[1, nullx]` are pinned. Signed-off-by: Simo Lin <25425177+slin1237@users.noreply.github.com> Co-authored-by: Chang Su <8605658+CatherineSue@users.noreply.github.com> Co-authored-by: Praneth Paruchuri <pranethparuchuri@gmail.com>
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Review on behalf of the maintainers (rule 17 checklist, rules 0, 20 to 23 and 27), at head 17ea12f: the approved c1678f7 plus one commit, test(symphony): tell codespell the literal prefixes are deliberate, re-approved on sight as the previous review offered.
The change. git diff c1678f78 17ea12fa touches one file, crates/symphony/src/json/partial.rs, three lines: // codespell:ignore tru appended to the two "tru" test lines (515 and 526) and // codespell:ignore fals to the "[true, fals" line (529). No code, no doc, no other file. The tree is otherwise the one reviewed at 1302a4d and c1678f7, so the gates and the differential run (2192 comparisons, 0 differences) of those reviews still describe it.
The fix, checked. codespell 2.4.1 with the hook's -L list from .pre-commit-config.yaml, run here on the file alone: exit 65 at c1678f7 (the three flags named in the previous review) and exit 0 at 17ea12f. cargo +nightly fmt --all -- --check on 17ea12f in a clean worktree: exit 0, so the trailing comments leave formatting as it was (the longest of the three lines is 95 columns). I did not rerun clippy, test and doc on this head; a line comment is invisible to all three, and the author reports them 0 with 25 tests passed.
Commit. One more, conventional subject, the author's Signed-off-by, Co-authored-by: Chang Su and Co-authored-by: Praneth Paruchuri, the same three trailers as the two commits before it, no AI trailer. The rule 27 authorship set is the one verified in the previous review.
Scope. Unchanged: crates/symphony/src/json/{mod,partial}.rs and one line in lib.rs; no dependency change.
Approved. Rule 25 at merge time: every check green on the head against main, with the GPU lanes skipped by the filter counting as pass. At review time Branch Naming, DCO, labeler and PR Title pass; pre-commit, the build and test lanes and the bot reviews had not reported yet.
| //! the original let `false` followed by letters advance it before rejecting the word (`[1, falsex` | ||
| //! consumed ten bytes there and consumes four here). Everything else behaves as before, since the | ||
| //! ported streaming parser must reproduce the old one until bellwether's fixtures judge otherwise; | ||
| //! the choices worth a second look are named here so that the parity review finds them: an unknown | ||
| //! escape keeps the escaped character, an unfinished `\u` escape becomes U+FFFD, a number that | ||
| //! cannot be read becomes `0`, a prefix of `true`, `false` or `null` counts as the literal, and a | ||
| //! trailing comma before a closing bracket is accepted. |
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🟡 Nit: The doc names only false as the case that changed, but null changed too. The original parse_null (tool_parser/src/partial_json.rs:500) caps its look-ahead at 4 bytes, which is exactly null. So [1, nullx passed the first check, the second pass consumed nullx before rejecting it, and the original returned ([1], 9). The port returns ([1], 4), and your new test pins that. The PR description already counts nullx as part of the deliberate change, but this module doc is the list the parity review reads.
The same thing applies to the literal doc at lines 349–350 and the test comment at lines 519–520. The literal doc also says "looked ahead over at most the literal's length". That's not quite right: for true the cap was 5 bytes (BOOLEAN_LENGTH, the length of false), which is why truex was already rejected without being consumed. More precisely: the cap was the longest literal of the kind, so a whole false or null filled it exactly and any letters after it were consumed.
| //! the original let `false` followed by letters advance it before rejecting the word (`[1, falsex` | |
| //! consumed ten bytes there and consumes four here). Everything else behaves as before, since the | |
| //! ported streaming parser must reproduce the old one until bellwether's fixtures judge otherwise; | |
| //! the choices worth a second look are named here so that the parity review finds them: an unknown | |
| //! escape keeps the escaped character, an unfinished `\u` escape becomes U+FFFD, a number that | |
| //! cannot be read becomes `0`, a prefix of `true`, `false` or `null` counts as the literal, and a | |
| //! trailing comma before a closing bracket is accepted. | |
| //! the original let a whole `false` or `null` followed by letters advance it before rejecting the | |
| //! word (`[1, falsex` consumed ten bytes there, `[1, nullx` nine; both consume four here). | |
| //! Everything else behaves as before, since the ported streaming parser must reproduce the old one | |
| //! until bellwether's fixtures judge otherwise; the choices worth a second look are named here so | |
| //! that the parity review finds them: an unknown escape keeps the escaped character, an unfinished | |
| //! `\u` escape becomes U+FFFD, a number that cannot be read becomes `0`, a prefix of `true`, | |
| //! `false` or `null` counts as the literal, and a trailing comma before a closing bracket is | |
| //! accepted. |
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Review on behalf of the maintainers (rule 17 checklist, rules 0, 20 to 23 and 27), at head 62c3f7b: the approved 17ea12f plus one commit, fix(symphony): never advance past a word that is no literal, the port's one declared behaviour change. Not on sight this time: the routine changed, so the gates and the differential run were redone on this head.
The change (partial.rs:344-364). literal now collects the whole run of is_alphabetic letters from a clone of the cursor, accepts it when it is the literal or, in prefix mode, a prefix of it, and only then advances over it; the cap (BOOLEAN_LENGTH, the length of the kind's longest literal) is gone. A word that starts with false or null and goes on with letters is therefore rejected with nothing consumed, as true plus letters already was (its cap of five was one more than the word, which is why truex and falsex behaved differently in the original). Pinned: [1, falsex] and [1, nullx] give ([1], 4) next to truex and trué, and the test's name is now true for every word. The decision to deviate from the original is written where rule 3 wants it, in the module doc and the PR body.
Gates. Run here on 62c3f7b in a clean worktree, exit codes captured: cargo +nightly fmt --all -- --check 0; cargo +1.98.0 clippy -p smg-symphony --all-targets -- -D warnings 0 (the only warning lines are cargo's manifest notes for model_gateway and bindings/python, the same on main); cargo +1.98.0 test -p smg-symphony 0, 25 passed; RUSTDOCFLAGS=-D warnings cargo +1.98.0 doc -p smg-symphony --no-deps 0; codespell 2.4.1 with the hook's word list over crates/symphony: 0.
Differential run, with the change declared. The scratch program of the earlier reviews, with [1, falsex] and {"x": nullfoo} added to its inputs (36 now; the earlier reviews said 36 for a list of 34, the comparison counts were right) and a rule for the declared change (a prefix containing false or null followed by a letter), comparing tool_parser::partial_json::PartialJson at 897ef9a with symphony::json::PartialJson at 62c3f7b over every character-boundary prefix, both allow_incomplete and both allow_partial_strings modes, plus is_complete on each prefix: 2300 comparisons, 16 differences inside the declared change, 0 outside it. All 16 are in prefix mode and differ in bytes consumed only, never in the value: [1, falsex and [1, falsex] give [1] with 10 consumed by the original and 4 by the port, as the module doc says; [nullx and [nullx] give [] with 6 against 1; the prefixes of {"x": nullfoo} from nullf on give the same object with 11 to 13 against 6. In strict mode both parsers reject the word, so nothing changes there, and is_complete agrees on every prefix. Those are the numbers the Test Plan can cite for this head.
Commit. One more, conventional subject, a body that says what was found and what changed, the author's Signed-off-by, Co-authored-by: Chang Su and Co-authored-by: Praneth Paruchuri, the same three trailers as the three commits before it, no AI trailer. The PR body's Solution and Test Plan name the change; the CodeRabbit thread is answered and resolved.
Scope. Unchanged: crates/symphony/src/json/{mod,partial}.rs and one line in lib.rs; no dependency change.
One nit, not blocking; the Claude bot's comment on the module doc says the same. The module doc (partial.rs:13-15) and the literal doc (:348-350) name false as the literal the original let through, and null was let through the same way ([1, nullx was ([1], 9) there, as the run above shows for [nullx), which the test pins. The literal doc's "looked ahead over at most the literal's length" was the cap of the kind's longest literal, five for both booleans, which is the reason truex was already rejected and falsex was not. This doc is the list the parity review reads, so it is worth saying precisely; that is a comment-only commit, and I re-approve it on sight as before. Whether to take it before merging is the author's call.
Approved. Rule 25 at merge time: every check green on the head against main, with the GPU lanes skipped by the filter counting as pass.
The module doc and the literal doc said the original let `false` plus letters advance the cursor; `null` plus letters did the same, since the look-ahead was capped at the longest literal of the kind (five bytes for either boolean, four for `null`), which is also why `truex` was already rejected unseen. The parity review reads this list, so it says so. Signed-off-by: Simo Lin <25425177+slin1237@users.noreply.github.com> Co-authored-by: Chang Su <8605658+CatherineSue@users.noreply.github.com> Co-authored-by: Praneth Paruchuri <pranethparuchuri@gmail.com>
| // The original agreed for `truex` and `trué` but consumed `falsex` (ten bytes) because its | ||
| // look-ahead stopped at the literal's length; this port treats every word alike. |
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🟡 Nit: This push updated the module doc and the literal doc, but this test comment still lists only falsex as the input the original consumed. The test now pins nullx too (line 529), and the original returned ([1], 9) for it, so the comment doesn't match the assertions under it. A one-line fix keeps all three places consistent:
| // The original agreed for `truex` and `trué` but consumed `falsex` (ten bytes) because its | |
| // look-ahead stopped at the literal's length; this port treats every word alike. | |
| // The original agreed for `truex` and `trué` but consumed `falsex` (ten bytes) and `nullx` | |
| // (nine) because its look-ahead stopped at the literal's length; this port treats every word alike. |
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Review on behalf of the maintainers (rule 17 checklist, rules 0, 20 to 23 and 27), at head 63d2b38: the approved 62c3f7b plus one commit, docs(symphony): name both literals the original's look-ahead let through, re-approved on sight as the previous review offered.
The change. git diff 62c3f7b8 63d2b38b touches crates/symphony/src/json/partial.rs only, 10 lines in and 7 out, every one a //! or /// line: the module doc now says the original's look-ahead was capped at the longest literal of the kind (five bytes for either boolean, four for null), so truex was rejected unseen while false or null followed by letters passed, was consumed and was rejected only then, with both numbers ([1, falsex ten bytes, [1, nullx nine, four here); the literal doc names all three words. That is the nit of the previous review, and the numbers match the differential run reported there. No code line changed, so the gates (fmt, clippy, test with 25 passed, doc, codespell, all 0) and the run (2300 comparisons, 16 inside the declared change, 0 outside) of the review at 62c3f7b describe this tree.
Commit. Conventional subject, the author's Signed-off-by, Co-authored-by: Chang Su and Co-authored-by: Praneth Paruchuri, as the four commits before it, no AI trailer.
Scope. Unchanged: crates/symphony/src/json/{mod,partial}.rs and one line in lib.rs; no dependency change.
Approved. Rule 25 at merge time: every check green on the head against main, with the GPU lanes skipped by the filter counting as pass; the squash body carries the sign-off and both Co-authored-by trailers.
2 participants
Description
Problem
Symphony's first ported format is the streaming JSON parser, and the first piece of that parser is the one that reads a JSON prefix: tool-call arguments stream in as a value that grows with every chunk, and an argument stream can only emit prefix-stable fragments if it knows the value determined so far and how many bytes of the input were understood. The old tool crate has this parser; under ground rule 27 Symphony may not import that crate, so the code is ported by copying.
Solution
symphony::json::partial, copied fromcrates/tool_parser/src/partial_json.rs(smg 897ef9a).PartialJson::parse(input, allow_partial_strings)returns the value determined so far and the bytes consumed, always on a character boundary; in prefix mode an input cut anywhere parses (an open object or array closes where the input ends, a value that has not started isnull, an unfinished string is returned as written or, with complete strings only, left out together with its key).is_completesays whether an input is one whole value.PartialJsonErroris the module's own error type.Behaviour is kept deliberately, with one exception, since the ported streaming parser must reproduce the old one until bellwether's fixtures judge otherwise. The exception, found by CodeRabbit: a word of letters that is no literal never advances the cursor, where the original's look-ahead, capped at the longest literal of the kind, let
falseornullfollowed by letters advance it before rejecting the word ([1, falsexconsumed ten bytes there and[1, nullxnine, both four here). The module doc names that change and the choices worth a second look in the parity review: an unknown escape keeps its character, an unfinished\ubecomes U+FFFD, a number that cannot be read becomes0, a prefix oftrue,falseornullcounts as the literal, a trailing comma before a closing bracket is accepted. What changed: the error type,is_completeas a module function, one literal routine for the three literals, the cursor's names and documentation.Changes
crates/symphony/src/json/mod.rs: thejsonmodule.crates/symphony/src/json/partial.rs:PartialJson,PartialJsonError,is_complete, the cursor, and fourteen tests.crates/symphony/src/lib.rs: the module.Nothing outside
crates/symphony/changes;Cargo.lockis unchanged (no new dependency).Authorship: the commits carry
Co-authored-byfor every author in the original file's history (Chang Su, Praneth Paruchuri; the commit author wrote the rest), as every port under ground rule 27 does.Test Plan
Run on the head, exit codes checked:
cargo +nightly fmt -p smg-symphony: 0, no change.cargo +1.98.0 clippy -p smg-symphony --all-targets -- -D warnings: 0.cargo +1.98.0 test -p smg-symphony: 0, 25 passed. The fourteen tests carry over the old crate's cases (crates/tool_parser/src/tests.rsandtests/tool_parser_partial_json.rs: a complete value, cut inputs, the byte offset on a character boundary, the depth limit, complete-strings-only leaving out the pending key with the 10-byte consumed count) and add: a sweep over every character-boundary cut of a sample value (parses, never consumes past the cut, lands on a boundary), strict mode errors with their messages, literal prefixes, escapes, numbers, trailing commas,is_complete, and the literal routine (a word that is no literal is checked whole before anything is consumed, over Unicode letters, so[1, truex,[1, trué,[1, falsexand[1, nullxall close the array after four bytes; the first two as in the original, found by the reviewer's differential run of the port against the original over every prefix of 36 inputs, 2192 comparisons; the last two are the port's one deliberate change).crates/tool_parser/src/partial_json.rsover every character-boundary prefix of a list of inputs, both modes of both flags, plusis_complete: at 1302a4d (review 5418726309) 34 inputs, 2192 comparisons, 0 differences; at 62c3f7b (review 5419041660) 36 inputs with[1, falsex]and{"x": nullfoo}added, 2300 comparisons, 16 differences, all inside the declared change (afalseornullword followed by letters, in prefix mode, differing in bytes consumed only, never in the value) and 0 outside it. The commits after 62c3f7b change documentation only.RUSTDOCFLAGS="-D warnings" cargo +1.98.0 doc -p smg-symphony --no-deps: 0.git diff --stat main...HEAD:crates/symphony/**only.Checklist
cargo +nightly fmtpassescargo clippy --all-targets -- -D warningspasses forsmg-symphony(the workspace-wide run with--all-featuresneeds OpenCV forllm-multimodalon this machine; CI runs it)