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#[macro_use]
extern crate pest_derive;
extern crate from_pest;
#[macro_use]
extern crate pest_ast;
extern crate pest;
mod parser {
#[derive(Parser)]
#[grammar = "grammar.pest"]
pub struct Parser;
}
// mod ast {
// use super::parser::Rule;
// use pest::Span;
// fn span_into_str(span: Span) -> &str {
// span.as_str()
// }
// #[derive(Debug, FromPest)]
// #[pest_ast(rule(Rule::program))]
// pub struct Program {
// pub statements: Vec<Statement>,
// pub eoi: EOI,
// }
// #[derive(Debug, FromPest)]
// #[pest_ast(rule(Rule::statement))]
// pub enum Statement {
// Definition(Definition),
// Expression(Expression),
// }
// #[derive(Debug, FromPest)]
// #[pest_ast(rule(Rule::definition))]
// pub struct Definition {
// pub symbols: Vec<Symbol>,
// pub expression: Expression,
// }
// #[derive(Debug, FromPest, Clone)]
// #[pest_ast(rule(Rule::expression))]
// pub enum Expression {
// IntegerLiteral(IntegerLiteral),
// Symbol(Symbol),
// SubExpressions(Vec<Expression>),
// }
// #[derive(Debug, FromPest, Copy, Clone)]
// #[pest_ast(rule(Rule::integer_literal))]
// pub struct IntegerLiteral {
// #[pest_ast(outer(with(span_into_str), with(str::parse::<i64>), with(Result::unwrap)))]
// pub value: i64,
// }
// #[derive(Debug, FromPest, Clone)]
// #[pest_ast(rule(Rule::symbol))]
// pub struct Symbol {
// #[pest_ast(outer(with(span_into_str), with(String::from)))]
// pub value: String,
// }
// #[derive(Debug, FromPest, Copy, Clone)]
// #[pest_ast(rule(Rule::EOI))]
// pub struct EOI;
// }
// mod ir {
// use super::ast;
// pub fn left_associate_exprs(program: &ast::Program) -> ast::Program {
// fn associate(expr: &ast::Expression) -> ast::Expression {
// match expr.nodes.len() {
// 1 | 2 => expr.clone(),
// 3.. => {
// let inner_node = ast::ExpressionNode::SubNodes(expr.nodes[0..2].to_vec());
// let rest = expr.nodes[2..].to_vec();
// let mut new_nodes = vec![inner_node];
// new_nodes.extend(rest);
// let outer_node = ast::Expression { nodes: new_nodes };
// associate(&outer_node)
// }
// _ => unreachable!(),
// }
// }
// let statements = program
// .statements
// .iter()
// .map(|s| match s {
// ast::Statement::Expression(expr) => ast::Statement::Expression(associate(expr)),
// ast::Statement::Definition(def) => ast::Statement::Definition(ast::Definition {
// symbols: def.symbols.clone(),
// expression: associate(&def.expression),
// }),
// })
// .collect();
// ast::Program {
// statements,
// eoi: program.eoi.clone(),
// }
// }
// }
// mod runtime {
// use super::ast;
// use std::collections::HashMap;
// use std::rc::Rc;
// #[derive(Debug)]
// pub enum BuiltinFn {
// Const(i64),
// }
// #[derive(Debug)]
// pub enum Function {
// Builtin(BuiltinFn),
// }
// pub fn evaluate(ast: &ast::Program) {
// let mut symbol_table: HashMap<String, Rc<Function>> = HashMap::new();
// // symbol_table.insert(String::from("const"));
// // fn apply_function(function: &Function, arg: &Function) -> Function {
// // match function {
// // Function::Builtin(builtin_fn) => match builtin_fn {
// // BuiltinFn::Const(value) => Function::Builtin(BuiltinFn::Const(*value)),
// // },
// // }
// // }
// fn evaluate_nonary(
// table: &HashMap<String, Rc<Function>>,
// lhs: &ast::ExpressionNode,
// ) -> Rc<Function> {
// match lhs {
// ast::ExpressionNode::IntegerLiteral(literal) => {
// Rc::new(Function::Builtin(BuiltinFn::Const(literal.value)))
// }
// ast::ExpressionNode::Symbol(symbol) => match symbol.value.as_str() {
// "math-zero" => Rc::new(Function::Builtin(BuiltinFn::Const(0))),
// sym => (*table.get(sym).expect("symbol not found")).clone(),
// },
// _ => todo!("_ case in evaluate_nonary"),
// }
// }
// fn evaluate_unary(
// table: &HashMap<String, Rc<Function>>,
// lhs: &ast::ExpressionNode,
// rhs: &ast::ExpressionNode,
// ) -> Rc<Function> {
// let rhs_evaled = evaluate_nonary(&table, rhs);
// todo!("evaluate_unary")
// }
// for statement in &ast.statements {
// let res: Rc<Function> = match statement {
// ast::Statement::Expression(expression) => match expression.nodes.len() {
// 1 => evaluate_nonary(&symbol_table, &expression.nodes[0]),
// 2 => evaluate_unary(&symbol_table, &expression.nodes[0], &expression.nodes[1]),
// _ => unreachable!("expr arity > 2"),
// },
// ast::Statement::Definition(_) => {
// panic!("unsupported statement type: definition")
// }
// };
// println!("Result: {:#?}", res)
// }
// }
// }
fn main() {
// use ast::Program;
use from_pest::FromPest;
use pest::Parser;
use std::fs;
let unparsed_file = fs::read_to_string("samples/sample1.code").expect("cannot read file");
let mut parse_tree =
parser::Parser::parse(parser::Rule::program, &unparsed_file).expect("unsuccessful parse");
println!("parse tree = {:#?}", parse_tree);
// let syntax_tree: Program = Program::from_pest(&mut parse_tree).expect("infallible");
// println!("syntax tree = {:#?}", syntax_tree);
// let ir_tree = ir::left_associate_exprs(&syntax_tree);
// println!("ir tree = {:#?}", ir_tree);
// runtime::evaluate(&ir_tree);
// let tokens = program.
// for token in program.tokens() {
// println!("{:?}", token);
// }
// println!("{}", program)
// for statement in program.into_inner() {
// match statement.as_rule() {
// Rule::statement => {
// println!("{}", statement.as_str());
// }
// Rule::EOI => (),
// _ => unreachable!(),
// }
// }
// println!("Sum of fields: {}", field_sum);
// println!("Number of records: {}", record_count);
}
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