Struct Step3Parser 

pub struct Step3Parser { /* private fields */ }

Step3 format parser for tool calls

Handles the Step3 specific format with steptml XML: <｜tool_calls_begin｜><｜tool_call_begin｜>function<｜tool_sep｜><steptml:invoke name="{name}"><steptml:parameter name="{k}">{v}</steptml:parameter></steptml:invoke><｜tool_call_end｜><｜tool_calls_end｜>

Features:

• Unicode token delimiters
• StepTML XML format for invocations
• Support for multiple sequential tool calls

Implementations

impl Step3Parser

pub fn new() -> Self

Create a new Step3 parser

Trait Implementations

impl Default for Step3Parser

fn default() -> Self

Returns the “default value” for a type.

impl ToolParser for Step3Parser

fn parse_complete<'life0, 'life1, 'async_trait>( &'life0 self, text: &'life1 str, ) -> Pin<Box<dyn Future<Output = ParserResult<(String, Vec<ToolCall>)>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Parse complete tool calls from final output Returns (remaining_normal_text, tool_calls) tuple

fn parse_incremental<'life0, 'life1, 'life2, 'async_trait>( &'life0 mut self, chunk: &'life1 str, tools: &'life2 [Tool], ) -> Pin<Box<dyn Future<Output = ParserResult<StreamingParseResult>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Parse tool calls from model output (streaming) Parsers now maintain internal state, so self is mutable

fn has_tool_markers(&self, text: &str) -> bool

Check if text contains tool calls in this parser’s format

fn get_unstreamed_tool_args(&self) -> Option<Vec<ToolCallItem>>

Get unstreamed tool call arguments Returns tool call items for arguments that have been parsed but not yet streamed

fn reset(&mut self)

Reset the parser state for reuse across requests. This should clear all buffers and reset state to initial values.

fn as_token_parser(&self) -> Option<&dyn TokenToolParser>

Optionally expose a token-aware parser implementation. Default returns None, meaning the parser only supports text input.