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import * as vscode from "vscode";
import {
getToolSchemaMap,
extractChatRequestContext,
getCompletedToolCallKeys,
buildToolCallCanonicalKey,
isDuplicateSuppressionEnabled,
isToolCallInput,
hasRequiredToolArguments,
parseToolArguments,
parseToolArgumentsStrict,
repairToolArguments,
ChatRequestContext,
ToolSchema,
SkippedToolCallReason,
} from "../tools/parser";
import { debugLog } from "../shared/logging";
import { NimToolCall } from "../types";
export interface ToolCallStreamAggregatorOptions {
options: vscode.ProvideLanguageModelChatResponseOptions;
messages: readonly vscode.LanguageModelChatMessage[];
onEmitToolCall: (id: string, name: string, args: Record<string, unknown>) => void;
onSkipToolCall: (name: string, required: string[], reason?: SkippedToolCallReason) => void;
}
export class ToolCallStreamAggregator {
private toolSchemas: Map<string, ToolSchema>;
private requestContext: ChatRequestContext | undefined;
private emittedTextToolCallKeys: Set<string>;
private onEmitToolCall: (id: string, name: string, args: Record<string, unknown>) => void;
private onSkipToolCall: (
name: string,
required: string[],
reason?: SkippedToolCallReason,
) => void;
private toolCallBuffers = new Map<number, { id?: string; name?: string; args: string }>();
private completedToolCallIndices = new Set<number>();
private sawToolCall = false;
private emittedToolCall = false;
constructor(options: ToolCallStreamAggregatorOptions) {
this.toolSchemas = getToolSchemaMap(options.options);
this.requestContext = extractChatRequestContext(options.messages);
this.emittedTextToolCallKeys = getCompletedToolCallKeys(
options.messages,
this.requestContext,
this.toolSchemas,
);
this.onEmitToolCall = options.onEmitToolCall;
this.onSkipToolCall = options.onSkipToolCall;
}
public getSawToolCall(): boolean {
return this.sawToolCall;
}
public getEmittedToolCall(): boolean {
return this.emittedToolCall;
}
public getToolSchemas(): Map<string, ToolSchema> {
return this.toolSchemas;
}
public getRequestContext(): ChatRequestContext | undefined {
return this.requestContext;
}
public recordExtractedParameters(params: Record<string, unknown>): void {
Iif (!this.requestContext) {
this.requestContext = {};
}
this.requestContext.extractedParameters = {
...(this.requestContext.extractedParameters ?? {}),
...params,
};
}
public getEmittedTextToolCallKeys(): Set<string> {
return this.emittedTextToolCallKeys;
}
public handleToolCalls(deltas: readonly NimToolCall[]): void {
this.sawToolCall = true;
for (const tc of deltas) {
const idx = (tc as { index?: number }).index ?? 0;
Iif (this.completedToolCallIndices.has(idx)) {
continue;
}
const buf = this.toolCallBuffers.get(idx) ?? { args: "" };
if (tc.id && typeof tc.id === "string") {
buf.id = tc.id;
}
const func = tc.function;
if (func?.name && typeof func.name === "string") {
if (!buf.name || buf.name === func.name) {
buf.name = func.name;
} else Iif (func.name.startsWith(buf.name)) {
// Some providers repeat a cumulative prefix as the name arrives.
buf.name = func.name;
} else Iif (buf.name.startsWith(func.name)) {
// Keep the longer prefix when a provider repeats an earlier fragment.
} else if (this.hasToolNameCandidate(`${buf.name}${func.name}`)) {
// A complete tool name can itself be a prefix of another tool name.
// Prefer the concatenated candidate while it still matches a known
// name or prefix (for example, `read` + `_file` => `read_file`).
buf.name += func.name;
} else Eif (this.toolSchemas.has(func.name)) {
buf.name = func.name;
} else if (this.toolSchemas.has(buf.name)) {
// A complete known name followed by an unrelated fragment should
// not turn into a different tool name.
} else {
// OpenAI-compatible streams may split function names across deltas.
buf.name += func.name;
}
}
if (typeof func?.arguments === "string") {
buf.args += func.arguments;
}
this.toolCallBuffers.set(idx, buf);
if (buf.args.trim().length === 0) {
continue;
}
// Only emit early when the current buffer is strict JSON and already
// satisfies its schema. Incomplete JSON and syntactically valid but
// incomplete required arguments stay buffered until the stream ends.
try {
const schema = this.toolSchemas.get(buf.name ?? "");
const args = repairToolArguments(
buf.name ?? "",
parseToolArgumentsStrict(buf.args),
this.requestContext,
schema,
);
if (buf.name && isToolCallInput(args) && hasRequiredToolArguments(args, schema)) {
const canonicalKey = buildToolCallCanonicalKey(buf.name, args);
if (
isDuplicateSuppressionEnabled(buf.name) &&
this.emittedTextToolCallKeys.has(canonicalKey)
) {
this.onSkipToolCall(buf.name, [], "duplicate");
this.completedToolCallIndices.add(idx);
this.toolCallBuffers.delete(idx);
continue;
}
const id = buf.id && buf.id.length > 0 ? buf.id : `tool_${randomUUID()}`;
this.onEmitToolCall(id, buf.name, args);
this.emittedToolCall = true;
this.emittedTextToolCallKeys.add(canonicalKey);
this.completedToolCallIndices.add(idx);
this.toolCallBuffers.delete(idx);
}
} catch {
// JSON is incomplete or fails schema validation; flushRemaining() will
// repair and validate the complete buffer at stream end.
}
}
}
private hasToolNameCandidate(name: string): boolean {
for (const knownName of this.toolSchemas.keys()) {
if (knownName === name || knownName.startsWith(name)) {
return true;
}
}
return false;
}
public flushRemaining(): void {
for (const [idx, buf] of Array.from(this.toolCallBuffers.entries())) {
Iif (this.completedToolCallIndices.has(idx)) {
continue;
}
try {
const schema = this.toolSchemas.get(buf.name ?? "");
const args = repairToolArguments(
buf.name ?? "",
buf.args ? parseToolArguments(buf.args) : {},
this.requestContext,
schema,
);
if (buf.name && isToolCallInput(args) && hasRequiredToolArguments(args, schema)) {
const canonicalKey = buildToolCallCanonicalKey(buf.name, args);
Iif (
isDuplicateSuppressionEnabled(buf.name) &&
this.emittedTextToolCallKeys.has(canonicalKey)
) {
this.onSkipToolCall(buf.name, [], "duplicate");
this.completedToolCallIndices.add(idx);
this.toolCallBuffers.delete(idx);
continue;
}
const id = buf.id && buf.id.length > 0 ? buf.id : `tool_${randomUUID()}`;
this.onEmitToolCall(id, buf.name, args);
this.emittedToolCall = true;
this.emittedTextToolCallKeys.add(canonicalKey);
} else if (buf.name || buf.id || buf.args) {
this.onSkipToolCall(buf.name ?? "unknown_tool", schema?.required ?? []);
debugLog("Skipped invalid tool call at stream end", {
id: buf.id,
name: buf.name,
args,
});
}
this.completedToolCallIndices.add(idx);
this.toolCallBuffers.delete(idx);
} catch {
Iif (buf.name || buf.id || buf.args) {
this.onSkipToolCall(
buf.name ?? "unknown_tool",
this.toolSchemas.get(buf.name ?? "")?.required ?? [],
);
}
debugLog("Skipped truncated tool call at stream end", {
id: buf.id,
name: buf.name,
});
this.completedToolCallIndices.add(idx);
this.toolCallBuffers.delete(idx);
}
}
}
}
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