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//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use antlr4rust::common_token_stream::CommonTokenStream;
use antlr4rust::error_strategy::BailErrorStrategy;
use antlr4rust::tree::{ParseTree, ParseTreeListener};
use antlr4rust::InputStream;
use antlr_python_tool_call_parser::{
antlrpythonlexer, antlrpythonparser, antlrpythonparserlistener,
};
use antlrpythonlexer::AntlrPythonLexer;
use antlrpythonparser::{
AntlrPythonParser, AntlrPythonParserContextType, AntlrPythonParserTreeWalker,
ArgValContextAttrs, ArgValExprContextAttrs, DictContext, DictContextAttrs,
EmptyFunctionCallContextAttrs, FullFunctionCallContextAttrs, FunctionCallContext,
FunctionCallContextAttrs, ListContext, ListContextAttrs, ObjectContext, ObjectContextAttrs,
ValueContext, ValueContextAttrs,
};
use antlrpythonparserlistener::AntlrPythonParserListener;
use serde_json::{json, Map, Value};
use std::collections::HashSet;
fn strip_quotes(s: &str) -> &str {
if s.len() >= 2 {
let first = s.chars().next().unwrap();
let last = s.chars().last().unwrap();
if (first == '"' && last == '"') || (first == '\'' && last == '\'') {
return &s[1..s.len() - 1];
}
}
s
}
fn parse_value(value_ctx: &ValueContext) -> Result<Value, String> {
if let Some(int_token) = value_ctx.INT() {
let text = int_token.get_text();
if let Ok(val) = text.parse::<i64>() {
Ok(json!(val))
} else {
Err(format!("Invalid int: {}", text))
}
} else if let Some(float_token) = value_ctx.FLOAT() {
let text = float_token.get_text();
if let Ok(val) = text.parse::<f64>() {
Ok(json!(val))
} else {
Err(format!("Invalid float: {}", text))
}
} else if let Some(str_token) = value_ctx.STRING() {
let text_raw = str_token.get_text();
let text = strip_quotes(&text_raw);
Ok(json!(text))
} else if let Some(bool_token) = value_ctx.BOOL() {
Ok(json!(bool_token.get_text() == "True"))
} else if let Some(_) = value_ctx.NONE() {
Ok(Value::Null)
} else if let Some(list_ctx) = value_ctx.list() {
parse_list(&list_ctx)
} else if let Some(dict_ctx) = value_ctx.dict() {
parse_dict(&dict_ctx)
} else if let Some(obj_ctx) = value_ctx.object() {
parse_object(&obj_ctx)
} else {
Err(format!("Unhandled value type: {}", value_ctx.get_text()))
}
}
fn parse_list(list_ctx: &ListContext) -> Result<Value, String> {
let mut list = vec![];
for value in list_ctx.value_all() {
let parsed_value = parse_value(&value)?;
list.push(parsed_value);
}
Ok(Value::Array(list))
}
fn parse_dict(dict_ctx: &DictContext) -> Result<Value, String> {
let mut map = Map::new();
let keys = dict_ctx.key_all();
let values = dict_ctx.value_all();
if keys.len() != values.len() {
return Err("Dictionary keys and values count mismatch".to_string());
}
let mut seen_keys = HashSet::new();
for (i, key_token) in keys.iter().enumerate() {
let key_raw = key_token.get_text();
let key = strip_quotes(&key_raw).to_string();
if seen_keys.contains(&key) {
// Log duplicate key but don't treat it as an error.
eprintln!("Ignoring duplicate key: {}", key);
continue;
}
seen_keys.insert(key.clone());
let value_ctx = &values[i];
let parsed_value = parse_value(value_ctx)?;
map.insert(key, parsed_value);
}
Ok(Value::Object(map))
}
fn parse_object(object_ctx: &ObjectContext) -> Result<Value, String> {
let mut map = Map::new();
let name_token = object_ctx.NAME().ok_or("Missing object name")?;
let type_name = name_token.get_text();
map.insert("__type__".to_string(), json!(type_name));
if let Some(arg_val_expr) = object_ctx.argValExpr() {
let mut seen_keys = HashSet::new();
for arg_val in arg_val_expr.argVal_all() {
let arg_name_token = arg_val.NAME().ok_or("Missing argument name")?;
let arg_name = arg_name_token.get_text();
if seen_keys.contains(&arg_name) {
return Err(format!("Duplicate key: {}", arg_name));
}
seen_keys.insert(arg_name.clone());
let val_ctx = arg_val.value().ok_or("Missing argument value")?;
let parsed_val = parse_value(&val_ctx)?;
map.insert(arg_name, parsed_val);
}
}
Ok(Value::Object(map))
}
struct PythonListener {
tool_calls: Result<Vec<Value>, String>,
}
impl PythonListener {
fn new() -> Self {
PythonListener { tool_calls: Ok(Vec::new()) }
}
fn tool_calls(self) -> Result<Vec<Value>, String> {
self.tool_calls
}
}
impl<'input> ParseTreeListener<'input, AntlrPythonParserContextType> for PythonListener {}
impl<'input> AntlrPythonParserListener<'input> for PythonListener {
#[allow(non_snake_case)]
fn enter_functionCall(&mut self, ctx: &FunctionCallContext<'input>) {
if self.tool_calls.is_err() {
return;
}
if let Some(full_ctx) = ctx.fullFunctionCall() {
let name = match full_ctx.NAME() {
Some(n) => n.get_text(),
None => {
self.tool_calls = Err("Missing function name".to_string());
return;
}
};
let mut tool_call_map = Map::new();
tool_call_map.insert("name".to_string(), json!(name));
let mut args_map = Map::new();
if let Some(arg_val_expr) = full_ctx.argValExpr() {
let mut seen_keys = HashSet::new();
for arg_val in arg_val_expr.argVal_all() {
let arg_name_token = match arg_val.NAME() {
Some(n) => n,
None => {
self.tool_calls = Err("Missing argument name".to_string());
return;
}
};
let arg_name = arg_name_token.get_text();
if seen_keys.contains(&arg_name) {
self.tool_calls = Err(format!("Duplicate key: {}", arg_name));
return;
}
seen_keys.insert(arg_name.clone());
let val_ctx = match arg_val.value() {
Some(v) => v,
None => {
self.tool_calls = Err("Missing argument value".to_string());
return;
}
};
match parse_value(&val_ctx) {
Ok(v) => {
args_map.insert(arg_name, v);
}
Err(e) => {
self.tool_calls = Err(e);
return;
}
}
}
}
tool_call_map.insert("arguments".to_string(), Value::Object(args_map));
self.tool_calls.as_mut().unwrap().push(Value::Object(tool_call_map));
} else if let Some(empty_ctx) = ctx.emptyFunctionCall() {
let name = match empty_ctx.NAME() {
Some(n) => n.get_text(),
None => {
self.tool_calls = Err("Missing function name".to_string());
return;
}
};
let mut tool_call_map = Map::new();
tool_call_map.insert("name".to_string(), json!(name));
tool_call_map.insert("arguments".to_string(), json!({}));
self.tool_calls.as_mut().unwrap().push(Value::Object(tool_call_map));
}
}
}
pub fn parse_python_expression(text: &str) -> Result<Vec<Value>, String> {
if text.len() == 0 {
return Ok(Vec::new());
}
let lexer = AntlrPythonLexer::new(InputStream::new(text));
let mut parser = AntlrPythonParser::with_strategy(
CommonTokenStream::new(lexer),
Box::new(BailErrorStrategy::new()),
);
let start = match parser.main() {
Ok(start) => start,
Err(e) => return Err(e.to_string()),
};
match AntlrPythonParserTreeWalker::walk(Box::new(PythonListener::new()), start.as_ref()) {
Ok(listener) => listener.tool_calls(),
Err(e) => Err(e.to_string()),
}
}
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