271 lines
10 KiB
Rust
271 lines
10 KiB
Rust
|
use async_trait::async_trait;
|
||
|
|
use regex::Regex;
|
||
|
|
|
||
|
|
use crate::tool_parser::{
|
||
|
|
errors::ToolParserResult,
|
||
|
|
partial_json::PartialJson,
|
||
|
|
state::ParseState,
|
||
|
|
traits::ToolParser,
|
||
|
|
types::{FunctionCall, StreamResult, ToolCall},
|
||
|
|
};
|
||
|
|
|
||
|
|
/// Kimi K2 format parser for tool calls
|
||
|
|
///
|
||
|
|
/// Handles the Kimi K2 specific format:
|
||
|
|
/// `<|tool_calls_section_begin|><|tool_call_begin|>functions.{name}:{index}<|tool_call_argument_begin|>{json_args}<|tool_call_end|><|tool_calls_section_end|>`
|
||
|
|
///
|
||
|
|
/// Features:
|
||
|
|
/// - Token-based delimiters
|
||
|
|
/// - Function calls with explicit indexing
|
||
|
|
/// - JSON arguments
|
||
|
|
pub struct KimiK2Parser {
|
||
|
|
/// Parser for handling incomplete JSON during streaming
|
||
|
|
partial_json: PartialJson,
|
||
|
|
/// Regex for extracting complete tool calls
|
||
|
|
tool_call_extractor: Regex,
|
||
|
|
/// Regex for extracting partial tool calls (streaming)
|
||
|
|
stream_tool_call_extractor: Regex,
|
||
|
|
}
|
||
|
|
|
||
|
|
impl KimiK2Parser {
|
||
|
|
/// Create a new Kimi K2 parser
|
||
|
|
pub fn new() -> Self {
|
||
|
|
// Pattern for complete tool calls
|
||
|
|
let tool_call_pattern = r"<\|tool_call_begin\|>\s*(?P<tool_call_id>[\w\.]+:\d+)\s*<\|tool_call_argument_begin\|>\s*(?P<function_arguments>\{.*?\})\s*<\|tool_call_end\|>";
|
||
|
|
let tool_call_extractor = Regex::new(tool_call_pattern).expect("Valid regex pattern");
|
||
|
|
|
||
|
|
// Pattern for streaming (partial) tool calls
|
||
|
|
let stream_pattern = r"<\|tool_call_begin\|>\s*(?P<tool_call_id>[\w\.]+:\d+)\s*<\|tool_call_argument_begin\|>\s*(?P<function_arguments>\{.*)";
|
||
|
|
let stream_tool_call_extractor = Regex::new(stream_pattern).expect("Valid regex pattern");
|
||
|
|
|
||
|
|
Self {
|
||
|
|
partial_json: PartialJson::default(),
|
||
|
|
tool_call_extractor,
|
||
|
|
stream_tool_call_extractor,
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Check if text contains Kimi K2 tool markers
|
||
|
|
fn has_tool_markers(&self, text: &str) -> bool {
|
||
|
|
text.contains("<|tool_calls_section_begin|>")
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Parse function ID to extract name and index
|
||
|
|
fn parse_function_id(&self, id: &str) -> Option<(String, usize)> {
|
||
|
|
// Format: functions.{name}:{index} or namespace.functions.{name}:{index}
|
||
|
|
// Extract everything after the last dot before the colon as the function name
|
||
|
|
if let Some(colon_pos) = id.rfind(':') {
|
||
|
|
let before_colon = &id[..colon_pos];
|
||
|
|
let index_str = &id[colon_pos + 1..];
|
||
|
|
|
||
|
|
// Find the last dot to extract the function name
|
||
|
|
if let Some(dot_pos) = before_colon.rfind('.') {
|
||
|
|
let func_name = &before_colon[dot_pos + 1..];
|
||
|
|
|
||
|
|
if let Ok(index) = index_str.parse::<usize>() {
|
||
|
|
return Some((func_name.to_string(), index));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
None
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl Default for KimiK2Parser {
|
||
|
|
fn default() -> Self {
|
||
|
|
Self::new()
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#[async_trait]
|
||
|
|
impl ToolParser for KimiK2Parser {
|
||
|
|
async fn parse_complete(&self, text: &str) -> ToolParserResult<Vec<ToolCall>> {
|
||
|
|
// Check if text contains Kimi K2 format
|
||
|
|
if !self.has_tool_markers(text) {
|
||
|
|
return Ok(vec![]);
|
||
|
|
}
|
||
|
|
|
||
|
|
let mut tools = Vec::new();
|
||
|
|
|
||
|
|
// Extract all tool calls
|
||
|
|
for captures in self.tool_call_extractor.captures_iter(text) {
|
||
|
|
if let (Some(id_match), Some(args_match)) = (
|
||
|
|
captures.name("tool_call_id"),
|
||
|
|
captures.name("function_arguments"),
|
||
|
|
) {
|
||
|
|
let function_id = id_match.as_str();
|
||
|
|
let function_args = args_match.as_str();
|
||
|
|
|
||
|
|
// Parse function ID
|
||
|
|
if let Some((func_name, _index)) = self.parse_function_id(function_id) {
|
||
|
|
// Validate JSON arguments
|
||
|
|
if serde_json::from_str::<serde_json::Value>(function_args).is_ok() {
|
||
|
|
// Generate unique ID
|
||
|
|
let id = format!("kimi_call_{}", uuid::Uuid::new_v4());
|
||
|
|
|
||
|
|
tools.push(ToolCall {
|
||
|
|
id,
|
||
|
|
r#type: "function".to_string(),
|
||
|
|
function: FunctionCall {
|
||
|
|
name: func_name,
|
||
|
|
arguments: function_args.to_string(),
|
||
|
|
},
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
Ok(tools)
|
||
|
|
}
|
||
|
|
|
||
|
|
async fn parse_incremental(
|
||
|
|
&self,
|
||
|
|
chunk: &str,
|
||
|
|
state: &mut ParseState,
|
||
|
|
) -> ToolParserResult<StreamResult> {
|
||
|
|
state.buffer.push_str(chunk);
|
||
|
|
|
||
|
|
// Check for tool markers
|
||
|
|
let has_tool_call =
|
||
|
|
self.has_tool_markers(&state.buffer) || state.buffer.contains("<|tool_call_begin|>");
|
||
|
|
|
||
|
|
if !has_tool_call {
|
||
|
|
// No markers found, clear buffer and return
|
||
|
|
state.buffer.clear();
|
||
|
|
return Ok(StreamResult::Incomplete);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Try to match streaming pattern
|
||
|
|
if let Some(captures) = self.stream_tool_call_extractor.captures(&state.buffer) {
|
||
|
|
if let (Some(id_match), Some(args_match)) = (
|
||
|
|
captures.name("tool_call_id"),
|
||
|
|
captures.name("function_arguments"),
|
||
|
|
) {
|
||
|
|
let function_id = id_match.as_str();
|
||
|
|
let partial_args = args_match.as_str();
|
||
|
|
|
||
|
|
// Parse function ID
|
||
|
|
if let Some((func_name, _index)) = self.parse_function_id(function_id) {
|
||
|
|
// Send function name if not sent yet
|
||
|
|
if !state.in_string {
|
||
|
|
state.in_string = true; // Mark name as sent
|
||
|
|
return Ok(StreamResult::ToolName {
|
||
|
|
index: 0,
|
||
|
|
name: func_name.clone(),
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
// Check if we have a complete tool call
|
||
|
|
if let Some(end_pos) = partial_args.find("<|tool_call_end|>") {
|
||
|
|
// Extract just the JSON part
|
||
|
|
let json_args = &partial_args[..end_pos];
|
||
|
|
|
||
|
|
// Validate and parse JSON
|
||
|
|
if serde_json::from_str::<serde_json::Value>(json_args).is_ok() {
|
||
|
|
// Generate unique ID
|
||
|
|
let id = format!("kimi_call_{}", uuid::Uuid::new_v4());
|
||
|
|
|
||
|
|
let tool = ToolCall {
|
||
|
|
id,
|
||
|
|
r#type: "function".to_string(),
|
||
|
|
function: FunctionCall {
|
||
|
|
name: func_name,
|
||
|
|
arguments: json_args.to_string(),
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
// Find where this tool call ends in the buffer
|
||
|
|
if let Some(tool_end) = state.buffer.find("<|tool_call_end|>") {
|
||
|
|
let end_pos = tool_end + "<|tool_call_end|>".len();
|
||
|
|
state.buffer.drain(..end_pos);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Reset state for next tool
|
||
|
|
state.in_string = false;
|
||
|
|
|
||
|
|
return Ok(StreamResult::ToolComplete(tool));
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
// Try to parse partial JSON for streaming arguments
|
||
|
|
match self.partial_json.parse_value(partial_args) {
|
||
|
|
Ok((value, _consumed)) => {
|
||
|
|
let args_str = serde_json::to_string(&value)
|
||
|
|
.unwrap_or_else(|_| "{}".to_string());
|
||
|
|
|
||
|
|
return Ok(StreamResult::ToolArguments {
|
||
|
|
index: 0,
|
||
|
|
arguments: args_str,
|
||
|
|
});
|
||
|
|
}
|
||
|
|
Err(_) => {
|
||
|
|
// Can't parse yet, keep buffering
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
Ok(StreamResult::Incomplete)
|
||
|
|
}
|
||
|
|
|
||
|
|
fn detect_format(&self, text: &str) -> bool {
|
||
|
|
self.has_tool_markers(text) || text.contains("<|tool_call_begin|>")
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#[cfg(test)]
|
||
|
|
mod tests {
|
||
|
|
use super::*;
|
||
|
|
|
||
|
|
#[tokio::test]
|
||
|
|
async fn test_parse_kimi_single_tool() {
|
||
|
|
let parser = KimiK2Parser::new();
|
||
|
|
let input = r#"Some text
|
||
|
|
<|tool_calls_section_begin|>
|
||
|
|
<|tool_call_begin|>functions.get_weather:0<|tool_call_argument_begin|>{"location": "Tokyo", "units": "celsius"}<|tool_call_end|>
|
||
|
|
<|tool_calls_section_end|>More text"#;
|
||
|
|
|
||
|
|
let result = parser.parse_complete(input).await.unwrap();
|
||
|
|
assert_eq!(result.len(), 1);
|
||
|
|
assert_eq!(result[0].function.name, "get_weather");
|
||
|
|
assert!(result[0].function.arguments.contains("Tokyo"));
|
||
|
|
}
|
||
|
|
|
||
|
|
#[tokio::test]
|
||
|
|
async fn test_parse_kimi_multiple_tools() {
|
||
|
|
let parser = KimiK2Parser::new();
|
||
|
|
let input = r#"<|tool_calls_section_begin|>
|
||
|
|
<|tool_call_begin|>functions.search:0<|tool_call_argument_begin|>{"query": "rust"}<|tool_call_end|>
|
||
|
|
<|tool_call_begin|>functions.calculate:1<|tool_call_argument_begin|>{"expression": "2+2"}<|tool_call_end|>
|
||
|
|
<|tool_calls_section_end|>"#;
|
||
|
|
|
||
|
|
let result = parser.parse_complete(input).await.unwrap();
|
||
|
|
assert_eq!(result.len(), 2);
|
||
|
|
assert_eq!(result[0].function.name, "search");
|
||
|
|
assert_eq!(result[1].function.name, "calculate");
|
||
|
|
}
|
||
|
|
|
||
|
|
#[tokio::test]
|
||
|
|
async fn test_parse_kimi_with_whitespace() {
|
||
|
|
let parser = KimiK2Parser::new();
|
||
|
|
let input = r#"<|tool_calls_section_begin|>
|
||
|
|
<|tool_call_begin|> functions.test:0 <|tool_call_argument_begin|> {"key": "value"} <|tool_call_end|>
|
||
|
|
<|tool_calls_section_end|>"#;
|
||
|
|
|
||
|
|
let result = parser.parse_complete(input).await.unwrap();
|
||
|
|
assert_eq!(result.len(), 1);
|
||
|
|
assert_eq!(result[0].function.name, "test");
|
||
|
|
}
|
||
|
|
|
||
|
|
#[test]
|
||
|
|
fn test_detect_format() {
|
||
|
|
let parser = KimiK2Parser::new();
|
||
|
|
assert!(parser.detect_format("<|tool_calls_section_begin|>"));
|
||
|
|
assert!(parser.detect_format("<|tool_call_begin|>"));
|
||
|
|
assert!(!parser.detect_format("plain text"));
|
||
|
|
assert!(!parser.detect_format("[TOOL_CALLS]"));
|
||
|
|
}
|
||
|
|
}
|