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use super::{
common::{id, invalid, limit},
response_items::*,
responses_to_claude::ResponsesToClaudeStream,
};
use crate::{
transform::{TransformError, identity::IdentityRole},
wire::claude::{generate_content as c, stream as cs},
};
impl ResponsesToClaudeStream {
pub(super) fn flush_items(
&mut self,
out: &mut Vec<cs::StreamEvent>,
) -> Result<(), TransformError> {
loop {
let index = self.cursor;
let Some(mut item) = self.items.remove(&index) else {
return Ok(());
};
let advance = match &mut item.kind {
Kind::Excluded => item.done,
Kind::Message { parts } => {
for part in parts.values_mut() {
if part.block.is_none() {
let block = self.allocate_block()?;
part.block = Some(block);
self.emit(
out,
cs::StreamEvent::ContentBlockStart(
cs::ContentBlockStartEvent::builder(
block,
c::ResponseContentBlock::Text(
c::ResponseTextBlock::builder(
c::ResponseTextBlockType::Tag,
String::new(),
)
.build(),
),
)
.build(),
),
)?;
let text = std::mem::take(&mut part.pending);
self.held_bytes -= text.len();
item.held -= text.len();
if !text.is_empty() {
self.emit(
out,
cs::StreamEvent::ContentBlockDelta(
cs::ContentBlockDeltaEvent::builder(
block,
cs::ContentBlockDelta::Text(
cs::TextDelta::builder(text).build(),
),
)
.build(),
),
)?;
}
}
if part.done && !part.closed {
part.closed = true;
self.emit(
out,
cs::StreamEvent::ContentBlockStop(
cs::ContentBlockStopEvent::builder(part.block.unwrap()).build(),
),
)?;
}
}
item.done
}
Kind::Function {
call_id,
name,
caller,
pending,
block,
arguments_done,
closed,
} => {
if block.is_none() {
let n = self.allocate_block()?;
*block = Some(n);
let id = id(
&mut self.flow,
&self.policy,
crate::Dialect::OpenAi,
IdentityRole::ToolCall,
IdentityRole::ToolCall,
Some(call_id.clone()),
index as u64,
)?;
let mut tool = c::ResponseToolUseBlock::builder(
c::ResponseToolUseBlockType::Tag,
id,
Default::default(),
name.clone(),
)
.build();
tool.caller = caller.clone();
self.emit(
out,
cs::StreamEvent::ContentBlockStart(
cs::ContentBlockStartEvent::builder(
n,
c::ResponseContentBlock::ToolUse(tool),
)
.build(),
),
)?;
let args = std::mem::take(pending);
self.held_bytes -= args.len();
item.held -= args.len();
if !args.is_empty() {
self.emit(
out,
cs::StreamEvent::ContentBlockDelta(
cs::ContentBlockDeltaEvent::builder(
n,
cs::ContentBlockDelta::InputJson(
cs::InputJsonDelta::builder(args).build(),
),
)
.build(),
),
)?;
}
}
if *arguments_done && !*closed {
*closed = true;
self.emit(
out,
cs::StreamEvent::ContentBlockStop(
cs::ContentBlockStopEvent::builder(block.unwrap()).build(),
),
)?;
}
true
}
Kind::Reasoning => true,
Kind::Mcp {
final_item,
projected,
} => {
if item.done {
if !*projected {
let call = final_item
.take()
.ok_or_else(|| invalid("missing completed MCP call"))?;
self.held_bytes -= item.held;
item.held = 0;
let blocks = super::super::response::mcp::to_claude(
call,
index as u64,
&mut self.flow,
&self.policy,
&mut self.report,
)?;
for block in blocks {
self.complete_block(out, block)?;
}
*projected = true;
}
true
} else {
false
}
}
};
self.items.insert(index, item);
if !advance {
return Ok(());
}
self.cursor = self.cursor.checked_add(1).ok_or_else(limit)?;
}
}
}