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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/ai/proofreader.h"
#include "base/containers/span.h"
#include "base/metrics/histogram_functions.h"
#include "third_party/blink/public/mojom/ai/model_streaming_responder.mojom-blink.h"
#include "third_party/blink/renderer/modules/ai/ai_interface_proxy.h"
#include "third_party/blink/renderer/modules/ai/ai_metrics.h"
#include "third_party/blink/renderer/modules/ai/ai_writing_assistance_create_client.h"
#include "third_party/blink/renderer/modules/ai/model_execution_responder.h"
#include "third_party/blink/renderer/platform/text/text_break_iterator.h"
#include "third_party/blink/renderer/platform/wtf/casting.h"
#include "third_party/blink/renderer/platform/wtf/text/strcat.h"
#include "third_party/blink/renderer/platform/wtf/text/unicode_string.h"
#include "third_party/re2/src/re2/re2.h"
namespace blink {
// Represents two vector spans with matching subsequences; e.g.
// ['a', 'b', 'c', 'd'] and ['b', 'c', 'z'] -> {1, 0, 2}
struct MatchingBlock {
// The start index of the matching subsequence in the first list.
uint32_t start_a = 0;
// The start index of the matching subsequence in the second list.
uint32_t start_b = 0;
// The size of the matching block.
uint32_t size = 0;
};
// Start and end indices for a pair of subsequences from two vector spans.
struct BlockPair {
size_t start_a;
size_t end_a;
size_t start_b;
size_t end_b;
};
// Tokenize `text` by splitting it into a vector of words/spaces/punctuation.
Vector<String> Tokenize(const String& text) {
Vector<String> tokens;
if (text.empty()) {
return tokens;
}
// Obtain a word break iterator for the entire string.
// This iterator will find boundaries between words, punctuation, and spaces.
TextBreakIterator* it = WordBreakIterator(text, 0, text.length());
if (!it) {
return tokens;
}
// The iterator returns the indices of the boundaries. Iterate through them to
// create substrings, which we consider as tokens.
int32_t start = it->first();
for (int32_t end = it->next(); end != -1; end = it->next()) {
tokens.push_back(text.Substring(start, end - start));
start = end;
}
return tokens;
}
// Find the longest matching block in a and b.
// If there are multiple maximal matching blocks,
// return one that starts earliest in a, and of all those maximal matching
// blocks that start earliest in a, return the one that starts earliest in b.
//
// I.e:
// a = [" ", "a", "b"],
// b = ["a", "b", " ", "a", "b"]
// returns {0, 2, 3}
MatchingBlock LongestCommonSubsequence(base::span<const String> a,
base::span<const String> b) {
MatchingBlock result;
const size_t a_size = a.size();
const size_t b_size = b.size();
for (size_t i = 0; i < a_size; ++i) {
for (size_t j = 0; j < b_size; ++j) {
uint32_t size = 0;
while (i + size < a_size && j + size < b_size &&
a[i + size] == b[j + size]) {
++size;
}
if (size > result.size) {
result.start_a = i;
result.start_b = j;
result.size = size;
}
}
}
return result;
}
Vector<MatchingBlock> GetMatchingBlocks(Vector<String> seq_1,
Vector<String> seq_2) {
base::span seq_1_span = seq_1;
base::span seq_2_span = seq_2;
// A queue of block pairs to compare from the two sequences.
Deque<BlockPair> blocks_to_compare_queue;
blocks_to_compare_queue.push_back(
BlockPair(0, seq_1.size(), 0, seq_2.size()));
Vector<MatchingBlock> matching_blocks;
while (!blocks_to_compare_queue.empty()) {
BlockPair block_pair = blocks_to_compare_queue.front();
blocks_to_compare_queue.pop_front();
// Find the longest common subsequence in the two subspans.
MatchingBlock matching_block = LongestCommonSubsequence(
seq_1_span.subspan(block_pair.start_a,
block_pair.end_a - block_pair.start_a),
seq_2_span.subspan(block_pair.start_b,
block_pair.end_b - block_pair.start_b));
if (matching_block.size == 0) {
continue;
}
// Calculate the location of the matching block in the two original
// sequences.
uint32_t matching_start_in_seq_1 =
block_pair.start_a + matching_block.start_a;
uint32_t matching_start_in_seq_2 =
block_pair.start_b + matching_block.start_b;
matching_blocks.push_back(MatchingBlock(
matching_start_in_seq_1, matching_start_in_seq_2, matching_block.size));
// Push the remaining of the blocks to the left of the longest matching
// block found in this iteration for further process.
if (block_pair.start_a < matching_start_in_seq_1 &&
block_pair.start_b < matching_start_in_seq_2) {
blocks_to_compare_queue.push_back(
BlockPair(block_pair.start_a, matching_start_in_seq_1,
block_pair.start_b, matching_start_in_seq_2));
}
// Push the remaining of the blocks to the right of the longest matching
// block found in this iteration for further process.
if (matching_start_in_seq_1 + matching_block.size < block_pair.end_a &&
matching_start_in_seq_2 + matching_block.size < block_pair.end_b) {
blocks_to_compare_queue.push_back(BlockPair(
matching_start_in_seq_1 + matching_block.size, block_pair.end_a,
matching_start_in_seq_2 + matching_block.size, block_pair.end_b));
}
}
// Sort all matching blocks increasingly based on the start index in the
// first sequence.
std::sort(
matching_blocks.begin(), matching_blocks.end(),
[](MatchingBlock a, MatchingBlock b) { return a.start_a < b.start_a; });
return matching_blocks;
}
Vector<Correction> FindDifferences(Vector<String> a, Vector<String> b) {
// Index of next token to process.
uint32_t a_index = 0;
uint32_t b_index = 0;
// Index for error location in the original string that corresponds with
// the tokenized sequence a.
uint32_t error_start_index = 0;
uint32_t error_end_index = 0;
// Index for correction location in the corrected string that corresponds
// with the tokenized sequence b.
uint32_t correction_start_index = 0;
uint32_t correction_end_index = 0;
Vector<Correction> corrections;
Vector<MatchingBlock> matching_blocks = GetMatchingBlocks(a, b);
// Insert zero block at the end to cover the case when there's no matching
// block between the two sequences.
matching_blocks.push_back(MatchingBlock({a.size(), b.size(), 0}));
for (const MatchingBlock matching_block : matching_blocks) {
// When there's difference in the two tokenized sequence before the next
// matching block, a correction should be made to change from "a" to "b".
if (a_index < matching_block.start_a || b_index < matching_block.start_b) {
// Calculate error_end_index in the original string by accumulating
// all the tokens' sizes.
for (uint32_t i = a_index; i < matching_block.start_a; ++i) {
error_end_index += a[i].length();
}
String correction_text = "";
// Calculate correction_end_index in the new string by accumulating
// all the tokens' sizes.
for (uint32_t i = b_index; i < matching_block.start_b; ++i) {
correction_end_index += b[i].length();
// Concatenate tokens to find the correction text.
correction_text = correction_text + b[i];
}
Correction c = Correction({error_start_index, error_end_index,
correction_start_index, correction_end_index,
correction_text});
corrections.push_back(c);
}
// Increment error indexes to the next potential location of difference
// in the original string.
error_start_index = error_end_index;
for (uint32_t i = matching_block.start_a;
i < matching_block.start_a + matching_block.size; ++i) {
error_start_index += a[i].length();
}
error_end_index = error_start_index;
// Increment correction indexes to the next potential location of difference
// in the new string.
correction_start_index = correction_end_index;
for (uint32_t i = matching_block.start_b;
i < matching_block.start_b + matching_block.size; ++i) {
correction_start_index += b[i].length();
}
correction_end_index = correction_start_index;
// Increment index for processed tokens to the next potential location of
// difference in the tokenized sequences
a_index = matching_block.start_a + matching_block.size;
b_index = matching_block.start_b + matching_block.size;
}
return corrections;
}
Vector<Correction> GetCorrections(const String& input,
const String& corrected_input) {
// Tokenize to find differences on token-level.
Vector<String> tokenized_input = Tokenize(input);
Vector<String> tokenized_corrected_input = Tokenize(corrected_input);
Vector<Correction> corrections =
FindDifferences(tokenized_input, tokenized_corrected_input);
return corrections;
}
HeapVector<Member<ProofreadCorrection>> ToProofreadCorrections(
Vector<Correction> raw_corrections) {
HeapVector<Member<ProofreadCorrection>> corrections;
for (const Correction& c : raw_corrections) {
auto* correction = MakeGarbageCollected<ProofreadCorrection>();
correction->setStartIndex(c.error_start);
correction->setEndIndex(c.error_end);
correction->setCorrection(c.correction);
corrections.push_back(correction);
}
return corrections;
}
V8CorrectionType GetV8CorrectionTypeFromString(const String& type) {
if (type == "Spelling") {
return V8CorrectionType(V8CorrectionType::Enum::kSpelling);
}
if (type == "Punctuation") {
return V8CorrectionType(V8CorrectionType::Enum::kPunctuation);
}
if (type == "Capitalization") {
return V8CorrectionType(V8CorrectionType::Enum::kCapitalization);
}
if (type == "Preposition") {
return V8CorrectionType(V8CorrectionType::Enum::kPreposition);
}
if (type == "Missing words") {
return V8CorrectionType(V8CorrectionType::Enum::kMissingWords);
}
return V8CorrectionType(V8CorrectionType::Enum::kGrammar);
}
template <>
void AIWritingAssistanceCreateClient<
mojom::blink::AIProofreader,
mojom::blink::AIManagerCreateProofreaderClient,
ProofreaderCreateOptions,
Proofreader>::
RemoteCreate(
mojo::PendingRemote<mojom::blink::AIManagerCreateProofreaderClient>
client_remote) {
HeapMojoRemote<mojom::blink::AIManager>& ai_manager_remote =
AIInterfaceProxy::GetAIManagerRemote(GetExecutionContext());
ai_manager_remote->CreateProofreader(
std::move(client_remote), ToMojoProofreaderCreateOptions(options_));
}
template <>
void AIWritingAssistanceCreateClient<
mojom::blink::AIProofreader,
mojom::blink::AIManagerCreateProofreaderClient,
ProofreaderCreateOptions,
Proofreader>::RemoteCanCreate(CanCreateCallback callback) {
HeapMojoRemote<mojom::blink::AIManager>& ai_manager_remote =
AIInterfaceProxy::GetAIManagerRemote(GetExecutionContext());
ai_manager_remote->CanCreateProofreader(
ToMojoProofreaderCreateOptions(options_), std::move(callback));
}
Proofreader::Proofreader(
ScriptState* script_state,
scoped_refptr<base::SequencedTaskRunner> task_runner,
mojo::PendingRemote<mojom::blink::AIProofreader> pending_remote,
ProofreaderCreateOptions* options)
: ExecutionContextClient(ExecutionContext::From(script_state)),
remote_(GetExecutionContext()),
options_(std::move(options)),
destruction_abort_controller_(AbortController::Create(script_state)),
create_abort_signal_(options_->getSignalOr(nullptr)),
task_runner_(std::move(task_runner)) {
remote_.Bind(std::move(pending_remote), task_runner_);
if (create_abort_signal_) {
CHECK(!create_abort_signal_->aborted());
create_abort_handle_ = create_abort_signal_->AddAlgorithm(
BindOnce(&Proofreader::OnCreateAbortSignalAborted,
WrapWeakPersistent(this), WrapWeakPersistent(script_state)));
}
}
void Proofreader::Trace(Visitor* visitor) const {
ScriptWrappable::Trace(visitor);
ExecutionContextClient::Trace(visitor);
visitor->Trace(remote_);
visitor->Trace(options_);
visitor->Trace(destruction_abort_controller_);
visitor->Trace(create_abort_signal_);
visitor->Trace(create_abort_handle_);
}
ScriptPromise<V8Availability> Proofreader::availability(
ScriptState* script_state,
ProofreaderCreateCoreOptions* options,
ExceptionState& exception_state) {
if (!script_state->ContextIsValid()) {
ThrowInvalidContextException(exception_state);
return ScriptPromise<V8Availability>();
}
CHECK(options);
if (!ValidateAndCanonicalizeOptionLanguages(script_state->GetIsolate(),
options)) {
return ScriptPromise<V8Availability>();
}
auto* resolver =
MakeGarbageCollected<ScriptPromiseResolver<V8Availability>>(script_state);
auto promise = resolver->Promise();
ExecutionContext* execution_context = ExecutionContext::From(script_state);
HeapMojoRemote<mojom::blink::AIManager>& ai_manager_remote =
AIInterfaceProxy::GetAIManagerRemote(execution_context);
if (!ai_manager_remote.is_connected()) {
RejectPromiseWithInternalError(resolver);
return promise;
}
auto callback = BindOnce(
[](ScriptPromiseResolver<V8Availability>* resolver,
ExecutionContext* execution_context,
mojom::blink::ModelAvailabilityCheckResult result) {
Availability availability = HandleModelAvailabilityCheckResult(
execution_context, AIMetrics::AISessionType::kProofreader, result);
resolver->Resolve(AvailabilityToV8(availability));
},
WrapPersistent(resolver), WrapPersistent(execution_context));
ai_manager_remote->CanCreateProofreader(
ToMojoProofreaderCreateOptions(options), std::move(callback));
return promise;
}
ScriptPromise<Proofreader> Proofreader::create(
ScriptState* script_state,
ProofreaderCreateOptions* options,
ExceptionState& exception_state) {
if (!script_state->ContextIsValid()) {
ThrowInvalidContextException(exception_state);
return ScriptPromise<Proofreader>();
}
CHECK(options);
if (!ValidateAndCanonicalizeOptionLanguages(script_state->GetIsolate(),
options)) {
return ScriptPromise<Proofreader>();
}
AbortSignal* signal = options->getSignalOr(nullptr);
if (HandleAbortSignal(signal, script_state, exception_state)) {
return EmptyPromise();
}
auto* resolver =
MakeGarbageCollected<ScriptPromiseResolver<Proofreader>>(script_state);
auto promise = resolver->Promise();
ExecutionContext* execution_context = ExecutionContext::From(script_state);
HeapMojoRemote<mojom::blink::AIManager>& ai_manager_remote =
AIInterfaceProxy::GetAIManagerRemote(execution_context);
if (!ai_manager_remote.is_connected()) {
RejectPromiseWithInternalError(resolver);
return promise;
}
MakeGarbageCollected<AIWritingAssistanceCreateClient<
mojom::blink::AIProofreader,
mojom::blink::AIManagerCreateProofreaderClient, ProofreaderCreateOptions,
Proofreader>>(script_state, resolver, options);
return promise;
}
ScriptPromise<ProofreadResult> Proofreader::proofread(
ScriptState* script_state,
const String& input,
const ProofreaderProofreadOptions* options,
ExceptionState& exception_state) {
if (!script_state->ContextIsValid()) {
ThrowInvalidContextException(exception_state);
return ScriptPromise<ProofreadResult>();
}
CHECK(options);
AbortSignal* composite_signal = CreateCompositeSignal(script_state, options);
if (HandleAbortSignal(composite_signal, script_state, exception_state)) {
return EmptyPromise();
}
if (!remote_) {
ThrowSessionDestroyedException(exception_state);
return ScriptPromise<ProofreadResult>();
}
base::UmaHistogramCounts1M(AIMetrics::GetAISessionRequestSizeMetricName(
AIMetrics::AISessionType::kProofreader),
static_cast<int>(input.CharactersSizeInBytes()));
// Resolver and Promise for the final proofread() result.
auto* resolver = MakeGarbageCollected<ScriptPromiseResolver<ProofreadResult>>(
script_state);
auto promise = resolver->Promise();
String trimmed_input = input.StripWhiteSpace();
if (trimmed_input.empty()) {
auto* proofread_result = MakeGarbageCollected<ProofreadResult>();
proofread_result->setCorrectedInput(input);
resolver->Resolve(std::move(proofread_result));
return promise;
}
// Step 1: Prompt the model to proofread and return fully corrected text.
// Pass persistent refs to keep this instance alive during the response.
auto pending_remote = CreateModelExecutionResponder(
script_state, composite_signal, task_runner_,
AIMetrics::AISessionType::kProofreader,
BindOnce(&Proofreader::OnProofreadComplete, WrapPersistent(this),
WrapPersistent(resolver), WrapPersistent(script_state),
WrapPersistent(composite_signal), input),
/*overflow_callback=*/base::DoNothingWithBoundArgs(WrapPersistent(this)),
BindOnce(&Proofreader::OnProofreadError, WrapPersistent(this),
WrapPersistent(resolver)),
BindOnce(&Proofreader::OnProofreadAbort, WrapPersistent(this),
WrapPersistent(resolver), WrapPersistent(composite_signal),
WrapPersistent(script_state)));
remote_->Proofread(input, std::move(pending_remote));
return promise;
}
void Proofreader::destroy(ScriptState* script_state,
ExceptionState& exception_state) {
if (!script_state->ContextIsValid()) {
ThrowInvalidContextException(exception_state);
return;
}
remote_.reset();
destruction_abort_controller_->abort(script_state);
DestroyImpl();
}
// TODO(crbug.com424659255): Consolidate with AIWritingAssistanceBase.
void Proofreader::DestroyImpl() {
remote_.reset();
if (create_abort_handle_) {
create_abort_signal_->RemoveAlgorithm(create_abort_handle_);
create_abort_handle_ = nullptr;
}
}
void Proofreader::OnCreateAbortSignalAborted(ScriptState* script_state) {
if (script_state) {
destruction_abort_controller_->abort(
script_state, create_abort_signal_->reason(script_state));
}
DestroyImpl();
}
AbortSignal* Proofreader::CreateCompositeSignal(
ScriptState* script_state,
const ProofreaderProofreadOptions* options) {
HeapVector<Member<AbortSignal>> signals;
signals.push_back(destruction_abort_controller_->signal());
CHECK(options);
if (options->hasSignal()) {
signals.push_back(options->signal());
}
return MakeGarbageCollected<AbortSignal>(script_state, signals);
}
bool Proofreader::ValidateAndCanonicalizeOptionLanguages(
v8::Isolate* isolate,
ProofreaderCreateCoreOptions* options) {
using LanguageList = std::optional<Vector<String>>;
if (options->hasExpectedInputLanguages()) {
LanguageList result = ValidateAndCanonicalizeBCP47Languages(
isolate, options->expectedInputLanguages());
if (!result) {
return false;
}
options->setExpectedInputLanguages(*result);
}
if (options->hasCorrectionExplanationLanguage()) {
LanguageList result = ValidateAndCanonicalizeBCP47Languages(
isolate, {options->correctionExplanationLanguage()});
if (!result) {
return false;
}
options->setCorrectionExplanationLanguage((*result)[0]);
}
return true;
}
void Proofreader::OnProofreadComplete(
ScriptPromiseResolver<ProofreadResult>* resolver,
ScriptState* script_state,
AbortSignal* signal,
const String& input,
const String& corrected_input,
mojom::blink::ModelExecutionContextInfoPtr context_info) {
DCHECK(resolver);
if (signal && signal->aborted()) {
resolver->Reject(signal->reason(script_state));
return;
}
auto* proofread_result = MakeGarbageCollected<ProofreadResult>();
proofread_result->setCorrectedInput(corrected_input);
// Step 2: Find list of corrections by comparing original input and fully
// corrected input from model execution
auto raw_corrections = GetCorrections(input, corrected_input);
auto corrections = ToProofreadCorrections(raw_corrections);
proofread_result->setCorrections(corrections);
// Resolve if correction types and explanations are not requested.
if (!options_->includeCorrectionTypes() || corrections.empty()) {
resolver->Resolve(proofread_result);
return;
}
// Step 3: Fetch correction type labels for all corrections, if requested.
// Labels are fetched one-by-one, and when all labels are received,
// GetCorrectionTypes will be responsible for resolving the promise for
// proofread() with the `proofread_result`.
GetCorrectionTypes(resolver, script_state, signal, proofread_result,
raw_corrections, input, 0);
}
void Proofreader::OnProofreadError(
ScriptPromiseResolver<ProofreadResult>* resolver,
DOMException* exception) {
resolver->Reject(exception);
}
void Proofreader::OnProofreadAbort(
ScriptPromiseResolver<ProofreadResult>* resolver,
AbortSignal* signal,
ScriptState* script_state) {
resolver->Reject(signal->reason(script_state));
}
void Proofreader::GetCorrectionTypes(
ScriptPromiseResolver<ProofreadResult>* resolver,
ScriptState* script_state,
AbortSignal* signal,
ProofreadResult* result,
Vector<Correction> raw_corrections,
const String& input,
uint32_t correction_index) {
// Done getting all correction type labels.
if (correction_index == result->corrections().size()) {
resolver->Resolve(result);
return;
}
// Get correction type label for the next correction.
auto correction = raw_corrections[correction_index];
auto pending_remote = CreateModelExecutionResponder(
script_state, signal, task_runner_,
AIMetrics::AISessionType::kProofreader,
BindOnce(&Proofreader::OnLabelComplete, WrapPersistent(this),
WrapPersistent(resolver), WrapPersistent(script_state),
WrapPersistent(signal), WrapPersistent(result), raw_corrections,
input, correction_index),
/*overflow_callback=*/
base::DoNothingWithBoundArgs(WrapPersistent(this)),
/*error_callback=*/
BindOnce([](ScriptPromiseResolver<ProofreadResult>* resolver,
DOMException* exception) { resolver->Reject(exception); },
WrapPersistent(resolver)),
/*abort_callback=*/
BindOnce(
[](ScriptPromiseResolver<ProofreadResult>* resolver,
AbortSignal* signal, ScriptState* script_state) {
resolver->Reject(signal->reason(script_state));
},
WrapPersistent(resolver), WrapPersistent(signal),
WrapPersistent(script_state)));
String from = input.Substring(correction.error_start,
correction.error_end - correction.error_start);
String to = correction.correction;
String correction_instruction =
StrCat({"Correcting `", from, "` to `", to, "`"});
// Annotate the current error in the original input.
String input_with_error =
StrCat({input.Substring(0, correction.error_start), "`", from, "`",
input.Substring(correction.error_end)});
// Annotate the current correction in the corrected input.
String corrected_input = result->correctedInput();
String corrected_input_with_correction =
StrCat({corrected_input.Substring(0, correction.correction_start), "`",
to, "`", corrected_input.Substring(correction.correction_end)});
remote_->GetCorrectionType(input_with_error, corrected_input_with_correction,
correction_instruction, std::move(pending_remote));
}
void Proofreader::OnLabelComplete(
ScriptPromiseResolver<ProofreadResult>* resolver,
ScriptState* script_state,
AbortSignal* signal,
ProofreadResult* result,
Vector<Correction> raw_corrections,
const String& input,
uint32_t correction_index,
const String& model_response,
mojom::blink::ModelExecutionContextInfoPtr context_info) {
DCHECK(resolver);
if (signal && signal->aborted()) {
resolver->Reject(signal->reason(script_state));
return;
}
// Default correction type
String label = "Grammar";
// Parse the label from the response of the format {"label": "label0"}
RE2 pattern("{\"label\":\\s*\"([^\"]+)\"}");
StringUtf8Adaptor adaptor(model_response);
std::string_view response = adaptor.AsStringView();
std::string_view label_value;
if (RE2::FullMatch(response, pattern, &label_value)) {
label = String::FromUTF8(label_value);
}
result->corrections()[correction_index]->setType(
GetV8CorrectionTypeFromString(label));
uint32_t next_index = correction_index + 1;
GetCorrectionTypes(resolver, script_state, signal, result, raw_corrections,
input, next_index);
}
} // namespace blink
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