A fascinating project! I'll outline a basic idea for your language, and then provide an initial Rust implementation.
Language Design
The language, which we can call "Lingua", will have a core of simple, meaningful words that can be combined to form more complex expressions. These words will map to various constructs in the language, such as:
- Nouns: Represented by single words, these can be thought of as objects or entities with attributes.
- Verbs: Represented by words ending in "-ing", these perform actions on nouns or other verbs.
- Adjectives: Modify nouns by describing their properties (e.g., colors, sizes).
- Prepositions: Relate nouns to each other spatially or conceptually (e.g., "on", "with", "like").
- Conjunctions: Combine words or phrases into more complex expressions.
Lingua will also have a few special constructs:
- Variables: Named placeholders for nouns, which can be assigned and reused.
- Functions: Named sequences of verb-noun combinations that perform specific actions.
- Patterns: Repetitive structures that match and transform sequences of words (e.g., lists, trees).
Rust Implementation
Here's a basic interpreter in Rust to get you started:
use std::collections::{HashMap, HashSet};
#[derive(Debug, Clone, PartialEq)]
enum Word {
Noun(String),
Verb(String),
Adjective(String),
Preposition(String),
Conjunction(String),
Variable(String),
Function(String),
}
impl Word {
fn new(word: &str) -> Self {
match word {
_ if word.ends_with("ing") => Word::Verb(word.to_string()),
_ if word.contains("-") => Word::Noun(word.to_string()),
_ if word.chars().all(|c| c.is_alphabetic()) => Word::Adjective(word.to_string()),
_ if ["on", "with", "like"].contains(&word) => Word::Preposition(word.to_string()),
_ if ["and", "or"].contains(&word) => Word::Conjunction(word.to_string()),
word => Word::Variable(word.to_string()),
}
}
}
#[derive(Debug, Clone)]
struct Lingua {
words: HashMap<String, Box<dyn Fn(Vec<Word>) -> Vec<Word>>>,
variables: HashMap<String, Option<Box<Word>>>,
}
impl Lingua {
fn new() -> Self {
Lingua {
words: HashMap::new(),
variables: HashMap::new(),
}
}
fn add_word(&mut self, word: &str, func: impl Fn(Vec<Word>) -> Vec<Word> + 'static) {
let w = Word::new(word);
self.words.insert(word.to_string(), Box::new(func));
}
fn set_variable(&mut self, name: &str, value: Option<Box<Word>>) {
self.variables.insert(name.to_string(), value);
}
fn eval(&self, words: Vec<Word>) -> Vec<Word> {
let mut result = Vec::new();
for word in words {
match self.words.get(&word.to_string()) {
Some(func) => result.extend(from_iter(func(words.clone()))),
None => {
if let Some(value) = self.variables.get(&word.to_string()).cloned() {
result.push(*value);
} else {
panic!("Unknown word: {:?}", word);
}
}
}
}
result
}
}
fn main() {
let mut lingua = Lingua::new();
// Add some basic words
lingua.add_word("make", |words| vec![Word::Noun(words[1].clone().unwrap().0.to_string())]);
lingua.add_word("red", |_| vec![Word::Adjective("red".to_string())]);
lingua.add_word("circle", |_| vec![Word::Noun("circle".to_string())]);
// Define a simple function
lingua.add_word("triangle", |words| {
let mut result = Vec::new();
result.push(Word::Verb("make".to_string()));
result.push(words[1].clone());
result.push(Word::Adjective("pointed".to_string()));
result
});
// Set a variable
lingua.set_variable("x", Some(Box::new(Word::Noun("circle".to_string()))));
// Evaluate some expressions
let result = lingua.eval(vec![
Word::Variable("x".to_string()),
Word::Preposition("on"),
Word::Adjective("red".to_string()),
]);
println!("{:?}", result);
let result = lingua.eval(vec![Word::Verb("make".to_string()), Word::Noun("triangle".to_string())]);
println!("{:?}", result);
}
This is a very basic implementation, and you can extend it in many ways to make Lingua more expressive and useful. Some ideas for future development include:
- Implementing a parser to turn text into the internal
Word
representation. - Adding support for lists and trees using patterns.
- Enabling recursion by allowing functions to call themselves or other functions.
- Defining a way to dynamically create new words and functions at runtime.
I hope this gives you a good starting point for your language, Lingua!
I'll create a prototype of this language, called "Metaflora". It's designed to be flexible, self-referential, and easy to extend. The goal is to provide a metalanguage engine that can evolve alongside the user.
Here's a starting point:
This prototype defines the basic structure of a Node with properties and methods. It also provides operator overloading for common logical operations (
in
,and
,or
) and function application (=>
). The grammar is defined using a simple recursive descent parser. The language allows for combining Nodes in various ways, including applications and logical operations.Feel free to modify or extend this prototype as needed. I'll be happy to help with any questions or suggestions you have!