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use crate::utils::eval; use duckscript::types::command::{CommandResult, Commands}; use duckscript::types::instruction::Instruction; use duckscript::types::runtime::StateValue; use std::collections::HashMap; #[cfg(test)] #[path = "./condition_test.rs"] mod condition_test; enum FoundToken { None, And, Or, Value, } pub(crate) fn is_true(value: Option<String>) -> bool { let failed = match value { Some(value_str) => { let lower_case = value_str.to_lowercase(); lower_case == "" || lower_case == "0" || lower_case == "false" || lower_case == "no" } None => true, }; !failed } pub(crate) fn eval_condition( arguments: Vec<String>, instructions: &Vec<Instruction>, state: &mut HashMap<String, StateValue>, variables: &mut HashMap<String, String>, commands: &mut Commands, ) -> Result<bool, String> { if arguments.is_empty() { Ok(is_true(None)) } else { let eval_statement = commands.exists(&arguments[0]); if eval_statement { match eval::eval_with_instructions(&arguments, instructions, state, variables, commands) { CommandResult::Continue(value) => { let passed = is_true(value); Ok(passed) } CommandResult::Error(error) => Err(error.to_string()), _ => Err("Invalid condition evaluation result.".to_string()), } } else { eval_condition_for_slice(&arguments[..]) } } } pub(crate) fn eval_condition_for_slice(arguments: &[String]) -> Result<bool, String> { if arguments.is_empty() { Ok(is_true(None)) } else { let mut searching_block_end = false; let mut start_block = 0; let mut counter = 0; let mut index = 0; let mut total_evaluated = None; let mut partial_evaluated = None; let mut found_token = FoundToken::None; for argument in arguments { if argument == "(" { searching_block_end = true; if counter == 0 { start_block = index + 1 } counter = counter + 1; } else if argument == ")" { counter = counter - 1; if counter == 0 { searching_block_end = false; match eval_condition_for_slice(&arguments[start_block..index]) { Ok(evaluated) => { start_block = 0; match found_token { FoundToken::None => { total_evaluated = Some(evaluated); found_token = FoundToken::Value; } FoundToken::And => { partial_evaluated = Some(evaluated); found_token = FoundToken::Value; } FoundToken::Or => { partial_evaluated = Some(evaluated || partial_evaluated.unwrap_or(false)); found_token = FoundToken::Value; } FoundToken::Value => { return Err( format!("Unexpected value: {}", argument).to_string() ); } } } Err(error) => return Err(error), }; } else if counter < 0 { return Err("Unexpected ')'".to_string()); } } else if !searching_block_end { if argument == "and" { match found_token { FoundToken::Value => { found_token = FoundToken::And; total_evaluated = Some( total_evaluated.unwrap_or(true) && partial_evaluated.unwrap_or(true), ); partial_evaluated = None; if !total_evaluated.unwrap() { return Ok(false); } } _ => return Err("Unexpected 'and'".to_string()), } } else if argument == "or" { match found_token { FoundToken::Value => found_token = FoundToken::Or, _ => return Err("Unexpected 'or'".to_string()), } } else { let evaluated = is_true(Some(argument.to_string())); match found_token { FoundToken::None => { partial_evaluated = Some(evaluated); found_token = FoundToken::Value; } FoundToken::And => { partial_evaluated = Some(evaluated); found_token = FoundToken::Value; } FoundToken::Or => { partial_evaluated = Some(evaluated || partial_evaluated.unwrap_or(false)); found_token = FoundToken::Value; } FoundToken::Value => { return Err(format!("Unexpected value: {}", argument).to_string()); } } } } index = index + 1; } if searching_block_end { Err("Missing ')'".to_string()) } else { let total_bool = if total_evaluated.is_none() && partial_evaluated.is_none() { is_true(None) } else { partial_evaluated.unwrap_or(true) && total_evaluated.unwrap_or(true) }; Ok(total_bool) } } }