94 lines
3.4 KiB
TypeScript
94 lines
3.4 KiB
TypeScript
/**
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* Pure, total translation between harness vocabulary and ACP wire types.
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* @module @deepseek-ai/dsh-acp/codec
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*/
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import type { ContentBlock } from '@deepseek-ai/dsh-llm'
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import type { TurnEndReason } from '@deepseek-ai/dsh-session'
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import type { ContentBlock as AcpContentBlock, StopReason } from '@agentclientprotocol/sdk'
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/**
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* Map a harness {@link TurnEndReason} to the ACP `StopReason` wire enum.
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*
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* `completed` and the defensive `error` case map to `end_turn`;
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* `max-tokens` maps to `max_tokens`; `aborted`, `disposed`, and `rejected` map
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* to `cancelled`. The bridge rejects error turns before this mapping. Unknown
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* merge-extensible kinds use legal fallback `end_turn` rather than breaking
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* the prompt RPC.
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* @param reason - the harness turn-end reason to translate.
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* @returns the legal ACP wire value per the mapping above.
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*/
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export function turnEndToStopReason(reason: TurnEndReason): StopReason {
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switch (reason.kind) {
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case 'completed':
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return 'end_turn'
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case 'max-tokens':
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return 'max_tokens'
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case 'aborted':
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return 'cancelled'
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case 'disposed':
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return 'cancelled'
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case 'rejected':
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return 'cancelled'
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case 'error':
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return 'end_turn'
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// Merge-extensible: an unknown future TurnEndReason kind still has to produce a legal wire
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// value (the SDK rejects unknown stopReason), so default to end_turn rather than
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// assertNever.
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default:
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return 'end_turn'
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}
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}
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/**
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* Map replayable text to ACP message content. Other block kinds use their
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* prompt, thought-stream, or tool-update paths.
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* @param block - the harness content block to translate.
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* @returns the ACP block, or `undefined` for a kind with no message-content mapping.
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*/
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export function harnessBlockToAcpContent(block: ContentBlock): AcpContentBlock | undefined {
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switch (block.type) {
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case 'text':
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return { type: 'text', text: block.text }
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// reasoning → streamed as agent_thought_chunk, not a message block
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// tool-call / tool-result → the tool_call / tool_call_update path
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// plugin-added block types → not surfaced
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default:
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return undefined
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}
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}
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/**
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* Extract plain text from an ACP prompt's content blocks. Text blocks are
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* concatenated verbatim; resource links become explicit textual references so
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* baseline ACP clients can point at files without the bridge silently dropping
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* that context.
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* @param prompt - the ACP prompt blocks to flatten.
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* @returns the concatenated text, with resource links rendered as bracketed references.
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*/
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export function acpPromptToText(prompt: readonly AcpContentBlock[]): string {
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return prompt
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.flatMap((block): string[] => {
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switch (block.type) {
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case 'text':
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return [block.text]
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case 'resource_link':
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return [`\n[resource_link name=${JSON.stringify(block.name)} uri=${JSON.stringify(block.uri)}]\n`]
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default:
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return []
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}
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})
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.join('')
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}
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/**
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* Whether an ACP prompt contains content the bridge cannot accept. Baseline ACP
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* requires `text` and `resource_link`; richer inline payloads (`resource`,
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* image, audio, …) are rejected rather than silently dropped.
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* @param prompt - the ACP prompt blocks to inspect.
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* @returns `true` when any block is neither `text` nor `resource_link`.
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*/
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export function promptHasUnsupportedContent(prompt: readonly AcpContentBlock[]): boolean {
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return prompt.some(block => block.type !== 'text' && block.type !== 'resource_link')
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}
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