latest pushes
This commit is contained in:
parent
b8a82e9c81
commit
5eb03315b7
Binary file not shown.
891
src/bellos.rs
891
src/bellos.rs
@ -14,806 +14,22 @@
|
||||
// along with this program. If not, see <https://www.gnu.org/licenses/>.
|
||||
|
||||
#[allow(dead_code)]
|
||||
use glob::glob;
|
||||
use std::collections::HashMap;
|
||||
pub mod Interpreter {
|
||||
mod interpreter;
|
||||
pub use self::interpreter::*;
|
||||
}
|
||||
|
||||
pub mod Lexer {
|
||||
mod lexer;
|
||||
pub use self::lexer::*;
|
||||
}
|
||||
|
||||
pub mod Parser {
|
||||
mod parser;
|
||||
pub use self::parser::*;
|
||||
}
|
||||
pub mod utilities;
|
||||
use std::env;
|
||||
use std::fs::File;
|
||||
use std::io::{self, BufRead, Read, Write};
|
||||
use std::os::unix::io::AsRawFd;
|
||||
use std::process::{Child, Command, Stdio};
|
||||
use std::sync::{Arc, Mutex};
|
||||
use std::thread;
|
||||
|
||||
#[derive(Debug, Clone, PartialEq)]
|
||||
enum Token {
|
||||
Word(String),
|
||||
Assignment,
|
||||
Pipe,
|
||||
Redirect(String),
|
||||
LeftParen,
|
||||
RightParen,
|
||||
Semicolon,
|
||||
NewLine,
|
||||
If,
|
||||
Then,
|
||||
Else,
|
||||
Fi,
|
||||
While,
|
||||
Do,
|
||||
Done,
|
||||
For,
|
||||
In,
|
||||
Function,
|
||||
Ampersand,
|
||||
}
|
||||
|
||||
#[derive(Debug, Clone)]
|
||||
enum ASTNode {
|
||||
Command {
|
||||
name: String,
|
||||
args: Vec<String>,
|
||||
},
|
||||
Assignment {
|
||||
name: String,
|
||||
value: String,
|
||||
},
|
||||
Pipeline(Vec<ASTNode>),
|
||||
Redirect {
|
||||
node: Box<ASTNode>,
|
||||
direction: String,
|
||||
target: String,
|
||||
},
|
||||
Block(Vec<ASTNode>),
|
||||
If {
|
||||
condition: Box<ASTNode>,
|
||||
then_block: Box<ASTNode>,
|
||||
else_block: Option<Box<ASTNode>>,
|
||||
},
|
||||
While {
|
||||
condition: Box<ASTNode>,
|
||||
block: Box<ASTNode>,
|
||||
},
|
||||
For {
|
||||
var: String,
|
||||
list: Vec<String>,
|
||||
block: Box<ASTNode>,
|
||||
},
|
||||
Function {
|
||||
name: String,
|
||||
body: Box<ASTNode>,
|
||||
},
|
||||
Background(Box<ASTNode>),
|
||||
}
|
||||
|
||||
struct Lexer {
|
||||
input: Vec<char>,
|
||||
position: usize,
|
||||
}
|
||||
|
||||
impl Lexer {
|
||||
fn new(input: String) -> Self {
|
||||
Lexer {
|
||||
input: input.chars().collect(),
|
||||
position: 0,
|
||||
}
|
||||
}
|
||||
|
||||
fn next_token(&mut self) -> Option<Token> {
|
||||
self.skip_whitespace();
|
||||
|
||||
if self.position >= self.input.len() {
|
||||
return None;
|
||||
}
|
||||
|
||||
match self.input[self.position] {
|
||||
'=' => {
|
||||
self.position += 1;
|
||||
Some(Token::Assignment)
|
||||
}
|
||||
'|' => {
|
||||
self.position += 1;
|
||||
Some(Token::Pipe)
|
||||
}
|
||||
'>' => {
|
||||
self.position += 1;
|
||||
Some(Token::Redirect(">".to_string()))
|
||||
}
|
||||
'<' => {
|
||||
self.position += 1;
|
||||
Some(Token::Redirect("<".to_string()))
|
||||
}
|
||||
'(' => {
|
||||
self.position += 1;
|
||||
Some(Token::LeftParen)
|
||||
}
|
||||
')' => {
|
||||
self.position += 1;
|
||||
Some(Token::RightParen)
|
||||
}
|
||||
';' => {
|
||||
self.position += 1;
|
||||
Some(Token::Semicolon)
|
||||
}
|
||||
'\n' => {
|
||||
self.position += 1;
|
||||
Some(Token::NewLine)
|
||||
}
|
||||
'&' => {
|
||||
self.position += 1;
|
||||
Some(Token::Ampersand)
|
||||
}
|
||||
'"' => Some(self.read_string()),
|
||||
_ => Some(self.read_word()),
|
||||
}
|
||||
}
|
||||
|
||||
fn skip_whitespace(&mut self) {
|
||||
while self.position < self.input.len() && self.input[self.position].is_whitespace() {
|
||||
self.position += 1;
|
||||
}
|
||||
}
|
||||
|
||||
fn read_word(&mut self) -> Token {
|
||||
let start = self.position;
|
||||
while self.position < self.input.len()
|
||||
&& !self.input[self.position].is_whitespace()
|
||||
&& !matches!(
|
||||
self.input[self.position],
|
||||
'=' | '|' | '>' | '<' | '(' | ')' | ';' | '&' | '\n'
|
||||
)
|
||||
{
|
||||
self.position += 1;
|
||||
}
|
||||
let word: String = self.input[start..self.position].iter().collect();
|
||||
match word.as_str() {
|
||||
"if" => Token::If,
|
||||
"then" => Token::Then,
|
||||
"else" => Token::Else,
|
||||
"fi" => Token::Fi,
|
||||
"while" => Token::While,
|
||||
"for" => Token::For,
|
||||
"do" => Token::Do,
|
||||
"done" => Token::Done,
|
||||
"in" => Token::In,
|
||||
_ => Token::Word(word),
|
||||
}
|
||||
}
|
||||
|
||||
fn read_string(&mut self) -> Token {
|
||||
self.position += 1; // Skip opening quote
|
||||
let start = self.position;
|
||||
while self.position < self.input.len() && self.input[self.position] != '"' {
|
||||
self.position += 1;
|
||||
}
|
||||
let result = Token::Word(self.input[start..self.position].iter().collect());
|
||||
self.position += 1; // Skip closing quote
|
||||
result
|
||||
}
|
||||
}
|
||||
|
||||
struct Parser {
|
||||
tokens: Vec<Token>,
|
||||
position: usize,
|
||||
}
|
||||
|
||||
impl Parser {
|
||||
fn new(tokens: Vec<Token>) -> Self {
|
||||
Parser {
|
||||
tokens,
|
||||
position: 0,
|
||||
}
|
||||
}
|
||||
|
||||
fn parse(&mut self) -> Result<Vec<ASTNode>, String> {
|
||||
let mut nodes = Vec::new();
|
||||
while self.position < self.tokens.len() {
|
||||
nodes.push(self.parse_statement()?);
|
||||
self.consume_if(Token::Semicolon);
|
||||
self.consume_if(Token::NewLine);
|
||||
}
|
||||
Ok(nodes)
|
||||
}
|
||||
|
||||
fn parse_statement(&mut self) -> Result<ASTNode, String> {
|
||||
match &self.tokens[self.position] {
|
||||
Token::Word(_) => self.parse_command_or_assignment(),
|
||||
Token::LeftParen => self.parse_block(),
|
||||
Token::If => self.parse_if(),
|
||||
Token::While => self.parse_while(),
|
||||
Token::For => self.parse_for(),
|
||||
Token::Function => self.parse_function(),
|
||||
_ => Err(format!(
|
||||
"Unexpected token: {:?}",
|
||||
self.tokens[self.position]
|
||||
)),
|
||||
}
|
||||
}
|
||||
|
||||
fn parse_command_or_assignment(&mut self) -> Result<ASTNode, String> {
|
||||
let name = match &self.tokens[self.position] {
|
||||
Token::Word(w) => w.clone(),
|
||||
_ => {
|
||||
return Err(format!(
|
||||
"Expected word, found {:?}",
|
||||
self.tokens[self.position]
|
||||
))
|
||||
}
|
||||
};
|
||||
self.position += 1;
|
||||
|
||||
if self.position < self.tokens.len() && self.tokens[self.position] == Token::Assignment {
|
||||
self.position += 1;
|
||||
let value = match &self.tokens[self.position] {
|
||||
Token::Word(w) => w.clone(),
|
||||
_ => String::new(), // Allow empty assignments
|
||||
};
|
||||
if self.position < self.tokens.len() {
|
||||
self.position += 1;
|
||||
}
|
||||
Ok(ASTNode::Assignment { name, value })
|
||||
} else {
|
||||
let mut args = Vec::new();
|
||||
while self.position < self.tokens.len()
|
||||
&& !matches!(
|
||||
self.tokens[self.position],
|
||||
Token::Pipe
|
||||
| Token::Redirect(_)
|
||||
| Token::Semicolon
|
||||
| Token::NewLine
|
||||
| Token::Ampersand
|
||||
| Token::Assignment
|
||||
)
|
||||
{
|
||||
if let Token::Word(w) = &self.tokens[self.position] {
|
||||
args.push(w.clone());
|
||||
self.position += 1;
|
||||
} else {
|
||||
break;
|
||||
}
|
||||
}
|
||||
Ok(ASTNode::Command { name, args })
|
||||
}
|
||||
}
|
||||
|
||||
fn parse_pipeline_or_redirect(&mut self, left: ASTNode) -> Result<ASTNode, String> {
|
||||
if self.position >= self.tokens.len() {
|
||||
return Ok(left);
|
||||
}
|
||||
|
||||
match &self.tokens[self.position] {
|
||||
Token::Pipe => {
|
||||
self.position += 1;
|
||||
let right = self.parse_command_or_assignment()?;
|
||||
let pipeline = ASTNode::Pipeline(vec![left, right]);
|
||||
self.parse_pipeline_or_redirect(pipeline)
|
||||
}
|
||||
Token::Redirect(direction) => {
|
||||
self.position += 1;
|
||||
let target = match &self.tokens[self.position] {
|
||||
Token::Word(w) => w.clone(),
|
||||
_ => {
|
||||
return Err(format!(
|
||||
"Expected word after redirect, found {:?}",
|
||||
self.tokens[self.position]
|
||||
))
|
||||
}
|
||||
};
|
||||
self.position += 1;
|
||||
let redirect = ASTNode::Redirect {
|
||||
node: Box::new(left),
|
||||
direction: direction.clone(),
|
||||
target,
|
||||
};
|
||||
self.parse_pipeline_or_redirect(redirect)
|
||||
}
|
||||
Token::Ampersand => {
|
||||
self.position += 1;
|
||||
Ok(ASTNode::Background(Box::new(left)))
|
||||
}
|
||||
_ => Ok(left),
|
||||
}
|
||||
}
|
||||
|
||||
fn parse_if(&mut self) -> Result<ASTNode, String> {
|
||||
self.position += 1; // Consume 'if'
|
||||
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) {
|
||||
Some(Box::new(self.parse_block()?))
|
||||
} else {
|
||||
None
|
||||
};
|
||||
self.expect_token(Token::Fi)?;
|
||||
Ok(ASTNode::If {
|
||||
condition,
|
||||
then_block,
|
||||
else_block,
|
||||
})
|
||||
}
|
||||
|
||||
fn parse_while(&mut self) -> Result<ASTNode, String> {
|
||||
self.position += 1; // Consume 'while'
|
||||
let condition = Box::new(self.parse_command()?);
|
||||
self.expect_token(Token::Do)?;
|
||||
let block = Box::new(self.parse_block()?);
|
||||
self.expect_token(Token::Done)?;
|
||||
Ok(ASTNode::While { condition, block })
|
||||
}
|
||||
|
||||
fn parse_for(&mut self) -> Result<ASTNode, String> {
|
||||
self.position += 1; // Consume 'for'
|
||||
let var = match &self.tokens[self.position] {
|
||||
Token::Word(w) => w.clone(),
|
||||
_ => return Err("Expected variable name after 'for'".to_string()),
|
||||
};
|
||||
self.position += 1;
|
||||
self.expect_token(Token::In)?;
|
||||
let mut list = Vec::new();
|
||||
while self.position < self.tokens.len() && self.tokens[self.position] != Token::Do {
|
||||
if let Token::Word(w) = &self.tokens[self.position] {
|
||||
list.push(w.clone());
|
||||
self.position += 1;
|
||||
} else {
|
||||
break;
|
||||
}
|
||||
}
|
||||
self.expect_token(Token::Do)?;
|
||||
let block = Box::new(self.parse_block()?);
|
||||
self.expect_token(Token::Done)?;
|
||||
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] {
|
||||
Token::Word(w) => w.clone(),
|
||||
_ => {
|
||||
return Err(format!(
|
||||
"Expected function name, found {:?}",
|
||||
self.tokens[self.position]
|
||||
))
|
||||
}
|
||||
};
|
||||
self.position += 1;
|
||||
let body = Box::new(self.parse_block()?);
|
||||
Ok(ASTNode::Function { name, body })
|
||||
}
|
||||
|
||||
fn expect_token(&mut self, expected: Token) -> Result<(), String> {
|
||||
if self.position < self.tokens.len() && self.tokens[self.position] == expected {
|
||||
self.position += 1;
|
||||
Ok(())
|
||||
} else {
|
||||
Err(format!(
|
||||
"Expected {:?}, found {:?}",
|
||||
expected,
|
||||
self.tokens.get(self.position)
|
||||
))
|
||||
}
|
||||
}
|
||||
|
||||
fn consume_if(&mut self, token: Token) -> bool {
|
||||
if self.position < self.tokens.len() && self.tokens[self.position] == token {
|
||||
self.position += 1;
|
||||
true
|
||||
} else {
|
||||
false
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
struct Interpreter {
|
||||
variables: HashMap<String, String>,
|
||||
functions: HashMap<String, ASTNode>,
|
||||
background_jobs: Arc<Mutex<Vec<Child>>>,
|
||||
}
|
||||
|
||||
impl Interpreter {
|
||||
fn new() -> Self {
|
||||
Interpreter {
|
||||
variables: HashMap::new(),
|
||||
functions: HashMap::new(),
|
||||
background_jobs: Arc::new(Mutex::new(Vec::new())),
|
||||
}
|
||||
}
|
||||
|
||||
fn interpret(&mut self, nodes: Vec<ASTNode>) -> Result<(), String> {
|
||||
for node in nodes {
|
||||
self.interpret_node(Box::new(node))?;
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn interpret_node(&mut self, node: Box<ASTNode>) -> Result<Option<i32>, String> {
|
||||
match *node {
|
||||
ASTNode::Command { name, args } => self.execute_command(name, args),
|
||||
ASTNode::Assignment { name, value } => {
|
||||
let expanded_value = self.expand_variables(&value);
|
||||
self.variables.insert(name, expanded_value);
|
||||
Ok(None)
|
||||
}
|
||||
ASTNode::Pipeline(commands) => self.execute_pipeline(commands),
|
||||
ASTNode::Redirect {
|
||||
node,
|
||||
direction,
|
||||
target,
|
||||
} => self.execute_redirect(*node, direction, target),
|
||||
ASTNode::Block(statements) => {
|
||||
for statement in statements {
|
||||
self.interpret_node(Box::new(statement))?;
|
||||
}
|
||||
Ok(None)
|
||||
}
|
||||
ASTNode::If {
|
||||
condition,
|
||||
then_block,
|
||||
else_block,
|
||||
} => {
|
||||
if self.evaluate_condition(&condition)? {
|
||||
self.interpret_node(then_block)?;
|
||||
} else if let Some(else_block) = else_block {
|
||||
self.interpret_node(else_block)?;
|
||||
}
|
||||
Ok(None)
|
||||
}
|
||||
ASTNode::While { condition, block } => {
|
||||
while self.evaluate_condition(&condition)? {
|
||||
self.interpret_node(Box::new(*block.clone()))?;
|
||||
}
|
||||
Ok(None)
|
||||
}
|
||||
ASTNode::For { var, list, block } => {
|
||||
for item in list {
|
||||
self.variables.insert(var.clone(), item);
|
||||
self.interpret_node(Box::new(*block.clone()))?;
|
||||
}
|
||||
Ok(None)
|
||||
}
|
||||
ASTNode::Function { name, body } => {
|
||||
self.functions.insert(name, *body);
|
||||
Ok(None)
|
||||
}
|
||||
ASTNode::Background(node) => {
|
||||
let bg_jobs = Arc::clone(&self.background_jobs);
|
||||
thread::spawn(move || {
|
||||
let mut interpreter = Interpreter::new();
|
||||
interpreter.background_jobs = bg_jobs;
|
||||
if let Err(e) = interpreter.interpret_node(node) {
|
||||
eprintln!("Background job error: {}", e);
|
||||
}
|
||||
});
|
||||
Ok(None)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn execute_command(&mut self, name: String, args: Vec<String>) -> Result<Option<i32>, String> {
|
||||
let expanded_name = self.expand_variables(&name);
|
||||
let expanded_args: Vec<String> =
|
||||
args.iter().map(|arg| self.expand_variables(arg)).collect();
|
||||
|
||||
match expanded_name.as_str() {
|
||||
"echo" => {
|
||||
println!("{}", expanded_args.join(" "));
|
||||
Ok(Some(0))
|
||||
}
|
||||
"cd" => {
|
||||
let path = if expanded_args.is_empty() {
|
||||
env::var("HOME").unwrap_or_else(|_| ".".to_string())
|
||||
} else {
|
||||
expanded_args[0].clone()
|
||||
};
|
||||
if let Err(e) = env::set_current_dir(&path) {
|
||||
Err(format!("cd: {}", e))
|
||||
} else {
|
||||
Ok(Some(0))
|
||||
}
|
||||
}
|
||||
"exit" => std::process::exit(0),
|
||||
"export" => {
|
||||
for arg in expanded_args {
|
||||
let parts: Vec<&str> = arg.splitn(2, '=').collect();
|
||||
if parts.len() == 2 {
|
||||
env::set_var(parts[0], parts[1]);
|
||||
}
|
||||
}
|
||||
Ok(Some(0))
|
||||
}
|
||||
"jobs" => {
|
||||
let jobs = self.background_jobs.lock().unwrap();
|
||||
for (i, _) in jobs.iter().enumerate() {
|
||||
println!("[{}] Running", i + 1);
|
||||
}
|
||||
Ok(Some(0))
|
||||
}
|
||||
_ => {
|
||||
if let Some(func) = self.functions.get(&expanded_name) {
|
||||
return self.interpret_node(Box::new(func.clone()));
|
||||
}
|
||||
match Command::new(&expanded_name).args(&expanded_args).spawn() {
|
||||
Ok(mut child) => {
|
||||
let status = child.wait().map_err(|e| e.to_string())?;
|
||||
Ok(Some(status.code().unwrap_or(0)))
|
||||
}
|
||||
Err(e) => Err(format!("Failed to execute command: {}", e)),
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn evaluate_arithmetic(&self, expr: &str) -> Result<i32, String> {
|
||||
let tokens: Vec<&str> = expr.split_whitespace().collect();
|
||||
if tokens.len() != 3 {
|
||||
return Err("Invalid arithmetic expression".to_string());
|
||||
}
|
||||
|
||||
let a = self.get_var_value(tokens[0])?;
|
||||
let b = self.get_var_value(tokens[2])?;
|
||||
|
||||
match tokens[1] {
|
||||
"+" => Ok(a + b),
|
||||
"-" => Ok(a - b),
|
||||
"*" => Ok(a * b),
|
||||
"/" => {
|
||||
if b != 0 {
|
||||
Ok(a / b)
|
||||
} else {
|
||||
Err("Division by zero".to_string())
|
||||
}
|
||||
}
|
||||
"%" => {
|
||||
if b != 0 {
|
||||
Ok(a % b)
|
||||
} else {
|
||||
Err("Modulo by zero".to_string())
|
||||
}
|
||||
}
|
||||
_ => Err(format!("Unsupported operation: {}", tokens[1])),
|
||||
}
|
||||
}
|
||||
|
||||
fn get_var_value(&self, var: &str) -> Result<i32, String> {
|
||||
if let Some(value) = self.variables.get(var) {
|
||||
value
|
||||
.parse()
|
||||
.map_err(|_| format!("Invalid integer: {}", value))
|
||||
} else if let Ok(value) = env::var(var) {
|
||||
value
|
||||
.parse()
|
||||
.map_err(|_| format!("Invalid integer: {}", value))
|
||||
} else {
|
||||
var.parse()
|
||||
.map_err(|_| format!("Invalid integer or undefined variable: {}", var))
|
||||
}
|
||||
}
|
||||
|
||||
fn evaluate_condition(&mut self, condition: &ASTNode) -> Result<bool, String> {
|
||||
match condition {
|
||||
ASTNode::Command { name, args } => {
|
||||
let expanded_args: Vec<String> =
|
||||
args.iter().map(|arg| self.expand_variables(arg)).collect();
|
||||
match name.as_str() {
|
||||
"[" | "test" => {
|
||||
if expanded_args.len() < 3 || expanded_args.last() != Some(&"]".to_string())
|
||||
{
|
||||
return Err("Invalid test condition".to_string());
|
||||
}
|
||||
match expanded_args[1].as_str() {
|
||||
"-eq" => Ok(expanded_args[0] == expanded_args[2]),
|
||||
"-ne" => Ok(expanded_args[0] != expanded_args[2]),
|
||||
"-lt" => Ok(expanded_args[0].parse::<i32>().unwrap_or(0)
|
||||
< expanded_args[2].parse::<i32>().unwrap_or(0)),
|
||||
"-le" => Ok(expanded_args[0].parse::<i32>().unwrap_or(0)
|
||||
<= expanded_args[2].parse::<i32>().unwrap_or(0)),
|
||||
"-gt" => Ok(expanded_args[0].parse::<i32>().unwrap_or(0)
|
||||
> expanded_args[2].parse::<i32>().unwrap_or(0)),
|
||||
"-ge" => Ok(expanded_args[0].parse::<i32>().unwrap_or(0)
|
||||
>= expanded_args[2].parse::<i32>().unwrap_or(0)),
|
||||
"-z" => Ok(expanded_args[0].is_empty()),
|
||||
"-n" => Ok(!expanded_args[0].is_empty()),
|
||||
_ => Err(format!("Unsupported test condition: {}", expanded_args[1])),
|
||||
}
|
||||
}
|
||||
_ => {
|
||||
let result = self.execute_command(name.clone(), expanded_args)?;
|
||||
Ok(result == Some(0))
|
||||
}
|
||||
}
|
||||
}
|
||||
_ => 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();
|
||||
|
||||
for (i, command) in commands.iter().enumerate() {
|
||||
match command {
|
||||
ASTNode::Command { name, args } => {
|
||||
let mut cmd = Command::new(self.expand_variables(name));
|
||||
for arg in args {
|
||||
cmd.arg(self.expand_variables(arg));
|
||||
}
|
||||
|
||||
if let Some(prev_stdout) = previous_stdout.take() {
|
||||
cmd.stdin(prev_stdout);
|
||||
}
|
||||
|
||||
if i < commands.len() - 1 {
|
||||
cmd.stdout(Stdio::piped());
|
||||
}
|
||||
|
||||
let mut child = cmd.spawn().map_err(|e| e.to_string())?;
|
||||
if i < commands.len() - 1 {
|
||||
previous_stdout = child.stdout.take();
|
||||
}
|
||||
processes.push(child);
|
||||
}
|
||||
_ => return Err("Pipeline can only contain commands".to_string()),
|
||||
}
|
||||
}
|
||||
|
||||
let mut last_status = None;
|
||||
for mut process in processes {
|
||||
let status = process.wait().map_err(|e| e.to_string())?;
|
||||
last_status = Some(status.code().unwrap_or(0));
|
||||
}
|
||||
|
||||
Ok(last_status)
|
||||
}
|
||||
|
||||
fn execute_redirect(
|
||||
&mut self,
|
||||
node: ASTNode,
|
||||
direction: String,
|
||||
target: String,
|
||||
) -> Result<Option<i32>, String> {
|
||||
let target = self.expand_variables(&target);
|
||||
match direction.as_str() {
|
||||
">" => {
|
||||
let mut file = File::create(&target).map_err(|e| e.to_string())?;
|
||||
let result = self.capture_output(Box::new(node))?;
|
||||
file.write_all(result.as_bytes())
|
||||
.map_err(|e| e.to_string())?;
|
||||
Ok(Some(0))
|
||||
}
|
||||
"<" => {
|
||||
let mut file = File::open(&target).map_err(|e| e.to_string())?;
|
||||
let mut input = String::new();
|
||||
file.read_to_string(&mut input).map_err(|e| e.to_string())?;
|
||||
self.execute_with_input(Box::new(node), input)
|
||||
}
|
||||
_ => Err(format!("Unsupported redirection: {}", direction)),
|
||||
}
|
||||
}
|
||||
|
||||
fn capture_output(&mut self, node: Box<ASTNode>) -> Result<String, String> {
|
||||
let old_stdout = io::stdout();
|
||||
let mut handle = old_stdout.lock();
|
||||
let mut buffer = Vec::new();
|
||||
{
|
||||
let mut cursor = io::Cursor::new(&mut buffer);
|
||||
let result = self.interpret_node(node)?;
|
||||
write!(cursor, "{:?}", result).map_err(|e| e.to_string())?;
|
||||
}
|
||||
handle.write_all(&buffer).map_err(|e| e.to_string())?;
|
||||
String::from_utf8(buffer).map_err(|e| e.to_string())
|
||||
}
|
||||
|
||||
fn execute_with_input(
|
||||
&mut self,
|
||||
node: Box<ASTNode>,
|
||||
input: String,
|
||||
) -> Result<Option<i32>, String> {
|
||||
let mut temp_file = tempfile::NamedTempFile::new().map_err(|e| e.to_string())?;
|
||||
temp_file
|
||||
.write_all(input.as_bytes())
|
||||
.map_err(|e| e.to_string())?;
|
||||
temp_file.flush().map_err(|e| e.to_string())?;
|
||||
|
||||
let input_file = File::open(temp_file.path()).map_err(|e| e.to_string())?;
|
||||
|
||||
let stdin = io::stdin();
|
||||
let old_stdin = stdin.lock();
|
||||
let new_stdin = unsafe {
|
||||
use std::os::unix::io::FromRawFd;
|
||||
std::fs::File::from_raw_fd(input_file.as_raw_fd())
|
||||
};
|
||||
|
||||
let result = self.interpret_node(node);
|
||||
|
||||
drop(new_stdin);
|
||||
drop(old_stdin);
|
||||
|
||||
result
|
||||
}
|
||||
|
||||
fn expand_variables(&self, input: &str) -> String {
|
||||
let mut result = String::new();
|
||||
let mut chars = input.chars().peekable();
|
||||
while let Some(c) = chars.next() {
|
||||
if c == '$' {
|
||||
if chars.peek() == Some(&'(') {
|
||||
chars.next(); // consume '('
|
||||
let expr: String = chars.by_ref().take_while(|&c| c != ')').collect();
|
||||
if expr.starts_with('(') && expr.ends_with(')') {
|
||||
// Arithmetic expression
|
||||
let arithmetic_expr = &expr[1..expr.len() - 1];
|
||||
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
|
||||
.by_ref()
|
||||
.take_while(|&c| c.is_alphanumeric() || c == '_')
|
||||
.collect();
|
||||
if let Some(value) = self.variables.get(&var_name) {
|
||||
result.push_str(value);
|
||||
} else if let Ok(value) = env::var(&var_name) {
|
||||
result.push_str(&value);
|
||||
}
|
||||
}
|
||||
} else {
|
||||
result.push(c);
|
||||
}
|
||||
}
|
||||
result
|
||||
}
|
||||
|
||||
fn expand_wildcards(&self, pattern: &str) -> Vec<String> {
|
||||
match glob(pattern) {
|
||||
Ok(paths) => paths
|
||||
.filter_map(Result::ok)
|
||||
.map(|path| path.to_string_lossy().into_owned())
|
||||
.collect(),
|
||||
Err(_) => vec![pattern.to_string()],
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn main() -> Result<(), String> {
|
||||
let mut interpreter = Interpreter::new();
|
||||
@ -829,80 +45,3 @@ fn main() -> Result<(), String> {
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn execute_script(interpreter: &mut Interpreter, filename: &str) -> Result<(), String> {
|
||||
let file =
|
||||
File::open(filename).map_err(|e| format!("Error opening file {}: {}", filename, e))?;
|
||||
let reader = io::BufReader::new(file);
|
||||
let mut lines = reader.lines();
|
||||
|
||||
// Check for shebang
|
||||
if let Some(Ok(first_line)) = lines.next() {
|
||||
if !first_line.starts_with("#!") {
|
||||
// If no shebang, process this line
|
||||
process_line(interpreter, &first_line, 1)?;
|
||||
}
|
||||
}
|
||||
|
||||
// Process remaining lines
|
||||
for (line_num, line) in lines.enumerate() {
|
||||
let line = line.map_err(|e| format!("Error reading line: {}", e))?;
|
||||
process_line(interpreter, &line, line_num + 2)?;
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn process_line(interpreter: &mut Interpreter, line: &str, line_num: usize) -> Result<(), String> {
|
||||
let trimmed_line = line.trim();
|
||||
if trimmed_line.is_empty() || trimmed_line.starts_with('#') {
|
||||
return Ok(()); // Skip empty lines and comments
|
||||
}
|
||||
|
||||
let lexer = Lexer::new(line.to_string());
|
||||
let tokens: Vec<Token> = lexer.into_iter().collect();
|
||||
let mut parser = Parser::new(tokens);
|
||||
match parser.parse() {
|
||||
Ok(ast) => {
|
||||
if let Err(e) = interpreter.interpret(ast) {
|
||||
eprintln!("Error on line {}: {}", line_num, e);
|
||||
}
|
||||
}
|
||||
Err(e) => eprintln!("Parse error on line {}: {}", line_num, e),
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn run_interactive_mode(interpreter: &mut Interpreter) -> Result<(), String> {
|
||||
loop {
|
||||
print!("bellos> ");
|
||||
io::stdout().flush().unwrap();
|
||||
|
||||
let mut input = String::new();
|
||||
io::stdin().read_line(&mut input).unwrap();
|
||||
|
||||
if input.trim().is_empty() {
|
||||
continue;
|
||||
}
|
||||
|
||||
let lexer = Lexer::new(input);
|
||||
let tokens: Vec<Token> = lexer.into_iter().collect();
|
||||
let mut parser = Parser::new(tokens);
|
||||
match parser.parse() {
|
||||
Ok(ast) => {
|
||||
if let Err(e) = interpreter.interpret(ast) {
|
||||
eprintln!("Error: {}", e);
|
||||
}
|
||||
}
|
||||
Err(e) => eprintln!("Parse error: {}", e),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Iterator for Lexer {
|
||||
type Item = Token;
|
||||
|
||||
fn next(&mut self) -> Option<Self::Item> {
|
||||
self.next_token()
|
||||
}
|
||||
}
|
||||
|
||||
155
src/utilities.rs
Normal file
155
src/utilities.rs
Normal file
@ -0,0 +1,155 @@
|
||||
// Copyright (C) 2024 Bellande Architecture Mechanism Research Innovation Center, Ronaldson Bellande
|
||||
|
||||
// This program is free software: you can redistribute it and/or modify
|
||||
// it under the terms of the GNU General Public License as published by
|
||||
// the Free Software Foundation, either version 3 of the License, or
|
||||
// (at your option) any later version.
|
||||
|
||||
// This program is distributed in the hope that it will be useful,
|
||||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU General Public License for more details.
|
||||
|
||||
// You should have received a copy of the GNU General Public License
|
||||
// along with this program. If not, see <https://www.gnu.org/licenses/>.
|
||||
|
||||
use std::fs::File;
|
||||
use std::io::{self, BufRead, Write};
|
||||
|
||||
#[derive(Debug, Clone, PartialEq)]
|
||||
enum Token {
|
||||
Word(String),
|
||||
Assignment,
|
||||
Pipe,
|
||||
Redirect(String),
|
||||
LeftParen,
|
||||
RightParen,
|
||||
Semicolon,
|
||||
NewLine,
|
||||
If,
|
||||
Then,
|
||||
Else,
|
||||
Fi,
|
||||
While,
|
||||
Do,
|
||||
Done,
|
||||
For,
|
||||
In,
|
||||
Function,
|
||||
Ampersand,
|
||||
}
|
||||
|
||||
#[derive(Debug, Clone)]
|
||||
enum ASTNode {
|
||||
Command {
|
||||
name: String,
|
||||
args: Vec<String>,
|
||||
},
|
||||
Assignment {
|
||||
name: String,
|
||||
value: String,
|
||||
},
|
||||
Pipeline(Vec<ASTNode>),
|
||||
Redirect {
|
||||
node: Box<ASTNode>,
|
||||
direction: String,
|
||||
target: String,
|
||||
},
|
||||
Block(Vec<ASTNode>),
|
||||
If {
|
||||
condition: Box<ASTNode>,
|
||||
then_block: Box<ASTNode>,
|
||||
else_block: Option<Box<ASTNode>>,
|
||||
},
|
||||
While {
|
||||
condition: Box<ASTNode>,
|
||||
block: Box<ASTNode>,
|
||||
},
|
||||
For {
|
||||
var: String,
|
||||
list: Vec<String>,
|
||||
block: Box<ASTNode>,
|
||||
},
|
||||
Function {
|
||||
name: String,
|
||||
body: Box<ASTNode>,
|
||||
},
|
||||
Background(Box<ASTNode>),
|
||||
}
|
||||
|
||||
fn execute_script(interpreter: &mut Interpreter, filename: &str) -> Result<(), String> {
|
||||
let file =
|
||||
File::open(filename).map_err(|e| format!("Error opening file {}: {}", filename, e))?;
|
||||
let reader = io::BufReader::new(file);
|
||||
let mut lines = reader.lines();
|
||||
|
||||
// Check for shebang
|
||||
if let Some(Ok(first_line)) = lines.next() {
|
||||
if !first_line.starts_with("#!") {
|
||||
// If no shebang, process this line
|
||||
process_line(interpreter, &first_line, 1)?;
|
||||
}
|
||||
}
|
||||
|
||||
// Process remaining lines
|
||||
for (line_num, line) in lines.enumerate() {
|
||||
let line = line.map_err(|e| format!("Error reading line: {}", e))?;
|
||||
process_line(interpreter, &line, line_num + 2)?;
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn process_line(interpreter: &mut Interpreter, line: &str, line_num: usize) -> Result<(), String> {
|
||||
let trimmed_line = line.trim();
|
||||
if trimmed_line.is_empty() || trimmed_line.starts_with('#') {
|
||||
return Ok(()); // Skip empty lines and comments
|
||||
}
|
||||
|
||||
let lexer = Lexer::new(line.to_string());
|
||||
let tokens: Vec<Token> = lexer.into_iter().collect();
|
||||
let mut parser = Parser::new(tokens);
|
||||
match parser.parse() {
|
||||
Ok(ast) => {
|
||||
if let Err(e) = interpreter.interpret(ast) {
|
||||
eprintln!("Error on line {}: {}", line_num, e);
|
||||
}
|
||||
}
|
||||
Err(e) => eprintln!("Parse error on line {}: {}", line_num, e),
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn run_interactive_mode(interpreter: &mut Interpreter) -> Result<(), String> {
|
||||
loop {
|
||||
print!("bellos> ");
|
||||
io::stdout().flush().unwrap();
|
||||
|
||||
let mut input = String::new();
|
||||
io::stdin().read_line(&mut input).unwrap();
|
||||
|
||||
if input.trim().is_empty() {
|
||||
continue;
|
||||
}
|
||||
|
||||
let lexer = Lexer::new(input);
|
||||
let tokens: Vec<Token> = lexer.into_iter().collect();
|
||||
let mut parser = Parser::new(tokens);
|
||||
match parser.parse() {
|
||||
Ok(ast) => {
|
||||
if let Err(e) = interpreter.interpret(ast) {
|
||||
eprintln!("Error: {}", e);
|
||||
}
|
||||
}
|
||||
Err(e) => eprintln!("Parse error: {}", e),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Iterator for Lexer {
|
||||
type Item = Token;
|
||||
|
||||
fn next(&mut self) -> Option<Self::Item> {
|
||||
self.next_token()
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user