bellos
This commit is contained in:
parent
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4
.gitignore
vendored
Normal file
4
.gitignore
vendored
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@ -0,0 +1,4 @@
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publish.sh
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Cargo.toml
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Cargo.lock
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target
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150
README.md
150
README.md
@ -12,7 +12,157 @@
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- Environment variables
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- redirection support
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## BELLOS Usage
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```
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#!/usr/bin/env bellos
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# File: hello_world.bellos
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# Simple Hello World script
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echo "Hello, World!"
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# Using variables
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name="Bellos"
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echo "Welcome to $name programming!"
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# ----------------------------------------
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#!/usr/bin/env bellos
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# File: basic_math.bellos
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# Demonstrating arithmetic operations
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a=5
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b=3
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sum=$((a + b))
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difference=$((a - b))
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product=$((a * b))
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quotient=$((a / b))
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echo "Sum: $sum"
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echo "Difference: $difference"
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echo "Product: $product"
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echo "Quotient: $quotient"
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# ----------------------------------------
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#!/usr/bin/env bellos
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# File: control_structures.bellos
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# Demonstrating if statements and loops
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# If statement
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if [ $# -eq 0 ]
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then
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echo "No arguments provided"
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elif [ $# -eq 1 ]
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then
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echo "One argument provided: $1"
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else
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echo "Multiple arguments provided"
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fi
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# For loop
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echo "Counting from 1 to 5:"
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for i in 1 2 3 4 5
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do
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echo $i
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done
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# While loop
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echo "Countdown:"
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count=5
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while [ $count -gt 0 ]
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do
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echo $count
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count=$((count - 1))
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done
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# ----------------------------------------
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#!/usr/bin/env bellos
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# File: functions.bellos
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# Defining and using functions
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function greet() {
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echo "Hello, $1!"
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}
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function add() {
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echo $(($1 + $2))
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}
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# Calling functions
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greet "User"
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result=$(add 3 4)
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echo "3 + 4 = $result"
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# ----------------------------------------
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#!/usr/bin/env bellos
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# File: file_operations.bellos
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# Demonstrating file operations
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# Writing to a file
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echo "This is a test file" > test.txt
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echo "Adding another line" >> test.txt
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# Reading from a file
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echo "Contents of test.txt:"
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cat test.txt
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# Using a while loop to read file line by line
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echo "Reading file line by line:"
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while read -r line
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do
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echo "Line: $line"
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done < test.txt
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# Cleaning up
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rm test.txt
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# ----------------------------------------
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#!/usr/bin/env bellos
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# File: string_manipulation.bellos
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# Demonstrating string manipulation
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string="Hello, Bellos!"
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# String length
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echo "Length of string: ${#string}"
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# Substring
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echo "First 5 characters: ${string:0:5}"
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# String replacement
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new_string=${string/Bellos/World}
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echo "Replaced string: $new_string"
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# Converting to uppercase
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echo "Uppercase: ${string^^}"
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# Converting to lowercase
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echo "Lowercase: ${string,,}"
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```
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## Website NPM
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- https://crates.io/crates/bellos
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### Installation
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- `cargo add bellos`
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```
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Name: bellos
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Version: 0.0.1
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Summary: Bellande Operating System Scripting Programming Language
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Home-page: github.com/RonaldsonBellande/bellos
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Author: Ronaldson Bellande
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Author-email: ronaldsonbellande@gmail.com
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License: GNU General Public License v3.0
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```
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## License
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3
git_scripts/.gitignore
vendored
Normal file
3
git_scripts/.gitignore
vendored
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@ -0,0 +1,3 @@
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fix_errors.sh
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push.sh
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repository_recal.sh
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765
src/bellos.rs
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765
src/bellos.rs
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@ -0,0 +1,765 @@
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// Copyright (C) 2024 Bellande Architecture Mechanism Research Innovation Center, Ronaldson Bellande
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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use glob::glob;
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use std::collections::HashMap;
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use std::env;
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use std::fs::{self, File};
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use std::io::{self, Read, Write};
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use std::os::unix::io::AsRawFd;
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use std::process::{Child, Command, Stdio};
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use std::sync::{Arc, Mutex};
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use std::thread;
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#[derive(Debug, Clone, PartialEq)]
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enum Token {
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Word(String),
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Assignment,
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Pipe,
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Redirect(String),
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LeftParen,
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RightParen,
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Semicolon,
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NewLine,
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If,
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Then,
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Else,
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Fi,
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While,
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Do,
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Done,
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For,
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In,
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Function,
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Ampersand,
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}
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#[derive(Debug, Clone)]
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enum ASTNode {
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Command {
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name: String,
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args: Vec<String>,
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},
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Assignment {
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name: String,
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value: String,
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},
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Pipeline(Vec<ASTNode>),
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Redirect {
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node: Box<ASTNode>,
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direction: String,
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target: String,
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},
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Block(Vec<ASTNode>),
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If {
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condition: Box<ASTNode>,
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then_block: Box<ASTNode>,
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else_block: Option<Box<ASTNode>>,
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},
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While {
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condition: Box<ASTNode>,
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block: Box<ASTNode>,
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},
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For {
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var: String,
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list: Vec<String>,
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block: Box<ASTNode>,
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},
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Function {
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name: String,
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body: Box<ASTNode>,
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},
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Background(Box<ASTNode>),
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}
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struct Lexer {
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input: Vec<char>,
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position: usize,
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}
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impl Lexer {
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fn new(input: String) -> Self {
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Lexer {
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input: input.chars().collect(),
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position: 0,
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}
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}
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fn next_token(&mut self) -> Option<Token> {
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self.skip_whitespace();
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if self.position >= self.input.len() {
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return None;
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}
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match self.input[self.position] {
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'=' => {
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self.position += 1;
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Some(Token::Assignment)
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}
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'|' => {
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self.position += 1;
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Some(Token::Pipe)
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}
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'>' => {
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self.position += 1;
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Some(Token::Redirect(">".to_string()))
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}
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'<' => {
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self.position += 1;
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Some(Token::Redirect("<".to_string()))
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}
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'(' => {
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self.position += 1;
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Some(Token::LeftParen)
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}
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')' => {
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self.position += 1;
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Some(Token::RightParen)
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}
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';' => {
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self.position += 1;
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Some(Token::Semicolon)
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}
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'\n' => {
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self.position += 1;
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Some(Token::NewLine)
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}
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'&' => {
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self.position += 1;
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Some(Token::Ampersand)
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}
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'"' => Some(self.read_string()),
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_ => Some(self.read_word()),
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}
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}
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fn skip_whitespace(&mut self) {
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while self.position < self.input.len() && self.input[self.position].is_whitespace() {
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self.position += 1;
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}
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}
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fn read_word(&mut self) -> Token {
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let start = self.position;
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while self.position < self.input.len()
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&& !self.input[self.position].is_whitespace()
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&& !matches!(
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self.input[self.position],
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'=' | '|' | '>' | '<' | '(' | ')' | ';' | '&' | '\n'
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)
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{
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self.position += 1;
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}
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let word: String = self.input[start..self.position].iter().collect();
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match word.as_str() {
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"if" => Token::If,
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"then" => Token::Then,
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"else" => Token::Else,
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"fi" => Token::Fi,
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"while" => Token::While,
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"do" => Token::Do,
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"done" => Token::Done,
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"for" => Token::For,
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"in" => Token::In,
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"function" => Token::Function,
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_ => Token::Word(word),
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}
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}
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fn read_string(&mut self) -> Token {
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self.position += 1; // Skip opening quote
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let start = self.position;
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while self.position < self.input.len() && self.input[self.position] != '"' {
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self.position += 1;
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}
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let result = Token::Word(self.input[start..self.position].iter().collect());
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self.position += 1; // Skip closing quote
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result
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}
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}
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struct Parser {
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tokens: Vec<Token>,
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position: usize,
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}
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impl Parser {
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fn new(tokens: Vec<Token>) -> Self {
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Parser {
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tokens,
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position: 0,
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}
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}
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fn parse(&mut self) -> Result<Vec<ASTNode>, String> {
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let mut nodes = Vec::new();
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while self.position < self.tokens.len() {
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nodes.push(self.parse_statement()?);
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self.consume_if(Token::Semicolon);
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self.consume_if(Token::NewLine);
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}
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Ok(nodes)
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}
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fn parse_statement(&mut self) -> Result<ASTNode, String> {
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match &self.tokens[self.position] {
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Token::Word(_) => self.parse_command_or_assignment(),
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Token::LeftParen => self.parse_block(),
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Token::If => self.parse_if(),
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Token::While => self.parse_while(),
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Token::For => self.parse_for(),
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Token::Function => self.parse_function(),
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_ => Err(format!(
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"Unexpected token: {:?}",
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self.tokens[self.position]
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)),
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}
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}
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fn parse_command_or_assignment(&mut self) -> Result<ASTNode, String> {
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let name = match &self.tokens[self.position] {
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Token::Word(w) => w.clone(),
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_ => {
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return Err(format!(
|
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"Expected word, found {:?}",
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self.tokens[self.position]
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))
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}
|
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};
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self.position += 1;
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|
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if self.position < self.tokens.len() && self.tokens[self.position] == Token::Assignment {
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self.position += 1;
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let value = match &self.tokens[self.position] {
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Token::Word(w) => w.clone(),
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_ => {
|
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return Err(format!(
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"Expected word after assignment, found {:?}",
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self.tokens[self.position]
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||||
))
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}
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};
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self.position += 1;
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Ok(ASTNode::Assignment { name, value })
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} else {
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let mut args = Vec::new();
|
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while self.position < self.tokens.len()
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&& !matches!(
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self.tokens[self.position],
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Token::Pipe
|
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| Token::Redirect(_)
|
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| Token::Semicolon
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| Token::NewLine
|
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| Token::Ampersand
|
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)
|
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{
|
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if let Token::Word(w) = &self.tokens[self.position] {
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args.push(w.clone());
|
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self.position += 1;
|
||||
} else {
|
||||
break;
|
||||
}
|
||||
}
|
||||
let command = ASTNode::Command { name, args };
|
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self.parse_pipeline_or_redirect(command)
|
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}
|
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}
|
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|
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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] {
|
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Token::Pipe => {
|
||||
self.position += 1;
|
||||
let right = self.parse_command_or_assignment()?;
|
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let pipeline = ASTNode::Pipeline(vec![left, right]);
|
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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_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))
|
||||
}
|
||||
|
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fn parse_if(&mut self) -> Result<ASTNode, String> {
|
||||
self.position += 1; // Consume 'if'
|
||||
let condition = Box::new(self.parse_statement()?);
|
||||
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_statement()?);
|
||||
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(format!(
|
||||
"Expected variable name after 'for', found {:?}",
|
||||
self.tokens[self.position]
|
||||
))
|
||||
}
|
||||
};
|
||||
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_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 } => {
|
||||
self.variables.insert(name, self.expand_variables(&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.interpret_node(Box::new(*condition))? == Some(0) {
|
||||
self.interpret_node(Box::new(*then_block))
|
||||
} else if let Some(else_block) = else_block {
|
||||
self.interpret_node(Box::new(*else_block))
|
||||
} else {
|
||||
Ok(None)
|
||||
}
|
||||
}
|
||||
ASTNode::While { condition, block } => {
|
||||
while self.interpret_node(Box::new(*condition.clone()))? == Some(0) {
|
||||
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_args: Vec<String> =
|
||||
args.iter().map(|arg| self.expand_variables(arg)).collect();
|
||||
match 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(&name) {
|
||||
return self.interpret_node(Box::new(func.clone()));
|
||||
}
|
||||
let expanded_name = self.expand_variables(&name);
|
||||
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 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())?;
|
||||
print!("{}", result);
|
||||
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> {
|
||||
// Create a temporary file to store the input
|
||||
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())?;
|
||||
|
||||
// Reopen the temp file as read-only
|
||||
let input_file = File::open(temp_file.path()).map_err(|e| e.to_string())?;
|
||||
|
||||
// Replace stdin with our temp file
|
||||
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())
|
||||
};
|
||||
|
||||
// Execute the node with the new stdin
|
||||
let result = self.interpret_node(node);
|
||||
|
||||
// Restore the old stdin
|
||||
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 == '$' && chars.peek().map_or(false, |&next| next != ' ') {
|
||||
let var_name: String = chars
|
||||
.by_ref()
|
||||
.take_while(|&c| c.is_alphanumeric() || c == '_')
|
||||
.collect();
|
||||
if var_name == "*" || var_name == "@" {
|
||||
// Expand to all arguments
|
||||
result.push_str(&env::args().skip(1).collect::<Vec<String>>().join(" "));
|
||||
} else if let Ok(value) = env::var(&var_name) {
|
||||
result.push_str(&value);
|
||||
} else if let Some(value) = self.variables.get(&var_name) {
|
||||
result.push_str(value);
|
||||
}
|
||||
} else if c == '~' && (chars.peek().is_none() || chars.peek() == Some(&'/')) {
|
||||
if let Ok(home) = env::var("HOME") {
|
||||
result.push_str(&home);
|
||||
} else {
|
||||
result.push(c);
|
||||
}
|
||||
} 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();
|
||||
|
||||
let args: Vec<String> = env::args().collect();
|
||||
if args.len() > 1 {
|
||||
// Execute script file
|
||||
let filename = &args[1];
|
||||
let content = fs::read_to_string(filename)
|
||||
.map_err(|e| format!("Error reading file {}: {}", filename, e))?;
|
||||
let lexer = Lexer::new(content);
|
||||
let tokens: Vec<Token> = lexer.into_iter().collect();
|
||||
let mut parser = Parser::new(tokens);
|
||||
let ast = parser.parse()?;
|
||||
interpreter.interpret(ast)?;
|
||||
} else {
|
||||
// Interactive mode
|
||||
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),
|
||||
}
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
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