BAMRI/bellos
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This commit is contained in:
Ronaldson Bellande 2024-09-17 09:06:02 -04:00
parent db719b631b
commit e253ef6d03
1 changed files with 75 additions and 45 deletions
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120
src/bellos.rs
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@ -314,21 +314,9 @@ impl Parser {
}
}
fn parse_block(&mut self) -> Result<ASTNode, String> {
self.position += 1; // Consume left paren
let mut statements = Vec::new();
while self.position < self.tokens.len() && self.tokens[self.position] != Token::RightParen {
statements.push(self.parse_statement()?);
self.consume_if(Token::Semicolon);
self.consume_if(Token::NewLine);
}
self.position += 1; // Consume right paren
Ok(ASTNode::Block(statements))
}
fn parse_if(&mut self) -> Result<ASTNode, String> {
self.position += 1; // Consume 'if'
let condition = Box::new(self.parse_statement()?);
let condition = Box::new(self.parse_command()?);
self.expect_token(Token::Then)?;
let then_block = Box::new(self.parse_block()?);
let else_block = if self.consume_if(Token::Else) {
@ -346,7 +334,7 @@ impl Parser {
fn parse_while(&mut self) -> Result<ASTNode, String> {
self.position += 1; // Consume 'while'
let condition = Box::new(self.parse_statement()?);
let condition = Box::new(self.parse_command()?);
self.expect_token(Token::Do)?;
let block = Box::new(self.parse_block()?);
self.expect_token(Token::Done)?;
@ -357,12 +345,7 @@ impl Parser {
self.position += 1; // Consume 'for'
let var = match &self.tokens[self.position] {
Token::Word(w) => w.clone(),
_ => {
return Err(format!(
"Expected variable name after 'for', found {:?}",
self.tokens[self.position]
))
}
_ => return Err("Expected variable name after 'for'".to_string()),
};
self.position += 1;
self.expect_token(Token::In)?;
@ -381,6 +364,46 @@ impl Parser {
Ok(ASTNode::For { var, list, block })
}
fn parse_block(&mut self) -> Result<ASTNode, String> {
let mut statements = Vec::new();
while self.position < self.tokens.len()
&& !matches!(
self.tokens[self.position],
Token::Fi | Token::Done | Token::Else
)
{
statements.push(self.parse_statement()?);
self.consume_if(Token::Semicolon);
self.consume_if(Token::NewLine);
}
Ok(ASTNode::Block(statements))
}
fn parse_command(&mut self) -> Result<ASTNode, String> {
let mut args = Vec::new();
while self.position < self.tokens.len()
&& !matches!(
self.tokens[self.position],
Token::Then | Token::Do | Token::Done | Token::Fi | Token::Else
)
{
if let Token::Word(w) = &self.tokens[self.position] {
args.push(w.clone());
self.position += 1;
} else {
break;
}
}
if args.is_empty() {
Err("Expected command".to_string())
} else {
Ok(ASTNode::Command {
name: args[0].clone(),
args: args[1..].to_vec(),
})
}
}
fn parse_function(&mut self) -> Result<ASTNode, String> {
self.position += 1; // Consume 'function'
let name = match &self.tokens[self.position] {
@ -467,16 +490,15 @@ impl Interpreter {
then_block,
else_block,
} => {
if self.interpret_node(condition)? == Some(0) {
self.interpret_node(then_block)
if self.evaluate_condition(&condition)? {
self.interpret_node(then_block)?;
} else if let Some(else_block) = else_block {
self.interpret_node(else_block)
} else {
Ok(None)
self.interpret_node(else_block)?;
}
Ok(None)
}
ASTNode::While { condition, block } => {
while self.interpret_node(Box::new(*condition.clone()))? == Some(0) {
while self.evaluate_condition(&condition)? {
self.interpret_node(Box::new(*block.clone()))?;
}
Ok(None)
@ -560,44 +582,49 @@ impl Interpreter {
}
}
fn evaluate_arithmetic(&self, expr: &str) -> i32 {
fn evaluate_arithmetic(&self, expr: &str) -> Result<i32, String> {
let tokens: Vec<&str> = expr.split_whitespace().collect();
if tokens.len() != 3 {
return 0; // Invalid expression
return Err("Invalid arithmetic expression".to_string());
}
let a = self.get_var_value(tokens[0]);
let b = self.get_var_value(tokens[2]);
let a = self.get_var_value(tokens[0])?;
let b = self.get_var_value(tokens[2])?;
match tokens[1] {
"+" => a + b,
"-" => a - b,
"*" => a * b,
"+" => Ok(a + b),
"-" => Ok(a - b),
"*" => Ok(a * b),
"/" => {
if b != 0 {
a / b
Ok(a / b)
} else {
0
Err("Division by zero".to_string())
}
}
"%" => {
if b != 0 {
a % b
Ok(a % b)
} else {
0
Err("Modulo by zero".to_string())
}
}
_ => 0, // Unsupported operation
_ => Err(format!("Unsupported operation: {}", tokens[1])),
}
}
fn get_var_value(&self, var: &str) -> i32 {
fn get_var_value(&self, var: &str) -> Result<i32, String> {
if let Some(value) = self.variables.get(var) {
value.parse().unwrap_or(0)
value
.parse()
.map_err(|_| format!("Invalid integer: {}", value))
} else if let Ok(value) = env::var(var) {
value.parse().unwrap_or(0)
value
.parse()
.map_err(|_| format!("Invalid integer: {}", value))
} else {
var.parse().unwrap_or(0)
var.parse()
.map_err(|_| format!("Invalid integer or undefined variable: {}", var))
}
}
@ -625,8 +652,6 @@ impl Interpreter {
>= expanded_args[2].parse::<i32>().unwrap_or(0)),
"-z" => Ok(expanded_args[0].is_empty()),
"-n" => Ok(!expanded_args[0].is_empty()),
"=" => Ok(expanded_args[0] == expanded_args[2]),
"!=" => Ok(expanded_args[0] != expanded_args[2]),
_ => Err(format!("Unsupported test condition: {}", expanded_args[1])),
}
}
@ -639,6 +664,7 @@ impl Interpreter {
_ => Err("Invalid condition node".to_string()),
}
}
fn execute_pipeline(&mut self, commands: Vec<ASTNode>) -> Result<Option<i32>, String> {
let mut previous_stdout = None;
let mut processes = Vec::new();
@ -755,7 +781,10 @@ impl Interpreter {
if expr.starts_with('(') && expr.ends_with(')') {
// Arithmetic expression
let arithmetic_expr = &expr[1..expr.len() - 1];
result.push_str(&self.evaluate_arithmetic(arithmetic_expr).to_string());
match self.evaluate_arithmetic(arithmetic_expr) {
Ok(value) => result.push_str(&value.to_string()),
Err(e) => result.push_str(&format!("Error: {}", e)),
}
}
} else {
let var_name: String = chars
@ -869,6 +898,7 @@ fn run_interactive_mode(interpreter: &mut Interpreter) -> Result<(), String> {
}
}
}
impl Iterator for Lexer {
type Item = Token;