gettin somewhere
Jordan Orelli
11 months ago
parent
56bfdcc9fc
commit
7004de4e82
@ -0,0 +1,202 @@
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use crate::{
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error::{ExecError, ParseError},
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lex::{Lexer, Token},
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parse2,
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};
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use std::{collections::HashSet, process};
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struct State {}
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impl State {
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pub fn new() -> Self {
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Self {}
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}
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}
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trait Eval {
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fn eval(&self, ctx: &mut State) -> Result<Value, ExecError>;
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}
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#[derive(Debug)]
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enum Element {
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Block(Block),
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Command(Command),
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Literal(Value),
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}
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impl Eval for Element {
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fn eval(&self, ctx: &mut State) -> Result<Value, ExecError> {
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use Element::*;
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match self {
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Block(block) => block.eval(ctx),
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Command(cmd) => cmd.eval(ctx),
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Literal(v) => v.eval(ctx),
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}
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}
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}
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#[derive(Debug, Clone)]
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enum Value {
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None,
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Text(String),
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ExitStatus(process::ExitStatus),
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}
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impl Eval for Value {
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fn eval(&self, ctx: &mut State) -> Result<Value, ExecError> {
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Ok(self.clone())
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}
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}
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impl Value {
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pub fn try_to_string(self) -> Result<String, ExecError> {
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match self {
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Value::None => Err(ExecError::type_error("expected text value, saw None value")),
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Value::Text(v) => Ok(v),
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Value::ExitStatus(_) => Err(ExecError::type_error(
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"expected text value, saw ExitStatus value",
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)),
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}
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}
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}
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#[derive(Debug)]
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struct Block {
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commands: Vec<Command>,
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}
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impl Block {
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pub fn new() -> Self {
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Block {
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commands: Vec::new(),
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}
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}
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}
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impl Eval for Block {
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fn eval(&self, ctx: &mut State) -> Result<Value, ExecError> {
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let mut v = Value::None;
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for cmd in self.commands.iter() {
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v = cmd.eval(ctx)?;
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}
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Ok(v)
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}
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}
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#[derive(Debug)]
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struct Command {
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name: Box<Element>,
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args: Vec<Element>,
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}
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impl Eval for Command {
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fn eval(&self, ctx: &mut State) -> Result<Value, ExecError> {
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let name = self.name.eval(ctx)?.try_to_string()?;
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let mut proc = process::Command::new(name);
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if self.args.len() > 0 {
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let args = self
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.args
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.iter()
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.map(|elem| elem.eval(ctx)?.try_to_string())
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.collect::<Result<Vec<String>, ExecError>>()?;
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proc.args(args);
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}
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let mut child = proc.spawn().map_err(|e| ExecError::ProcessSpawnError(e))?;
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let status = child.wait().map_err(|e| ExecError::ProcessWaitError(e))?;
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return Ok(Value::ExitStatus(status));
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}
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}
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// ????? waht am i doing now
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struct TreeBuilder {
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visited: HashSet<usize>,
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}
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impl TreeBuilder {
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fn new() -> Self {
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Self {
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visited: HashSet::new(),
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}
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}
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fn descend(&mut self, source: &mut parse2::Cursor) -> Result<Element, ParseError> {
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let e = match source.value() {
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parse2::Value::Start => {
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println!("start node");
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let mut root = Block::new();
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let children = source.iter_children();
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for mut child in children {
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println!("child");
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let e = self.descend(&mut child)?;
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match e {
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Element::Command(cmd) => root.commands.push(cmd),
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_ => panic!(),
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}
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}
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Element::Block(root)
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}
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parse2::Value::Statement => {
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println!("statement node");
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let mut children = source.iter_children();
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let mut first = children.next().unwrap();
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let name = self.descend(&mut first)?;
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let mut cmd = Command {
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name: Box::new(name),
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args: Vec::new(),
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};
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for mut child in children {
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let e = self.descend(&mut child)?;
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cmd.args.push(e);
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}
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Element::Command(cmd)
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}
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parse2::Value::Terminal(Token::Word(word)) => {
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println!("terminal word node");
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Element::Literal(Value::Text(word.to_string()))
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}
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parse2::Value::Terminal(Token::Glob(_)) => {
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todo!()
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}
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};
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println!("visited: {:?}", source.target.id);
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self.visited.insert(source.target.id);
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Ok(e)
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}
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}
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fn build(mut source: parse2::Cursor) -> Result<Element, ParseError> {
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source.up_to_root();
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let mut builder = TreeBuilder::new();
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builder.descend(&mut source)
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}
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fn x(source: &str) -> Result<Element, ParseError> {
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let tokens = Lexer::new(source);
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let parser = parse2::Parser::new(tokens);
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let mut parse_tree = parser.parse()?;
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println!("parse tree: {parse_tree:?}");
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let mut builder = TreeBuilder::new();
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builder.descend(&mut parse_tree)
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}
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#[cfg(test)]
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mod test {
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use super::*;
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use crate::lex::lex;
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#[test]
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fn hi() -> Result<(), ParseError> {
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let e = x("ls one two three ; ls four")?;
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print!("{:?}", e);
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Ok(())
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}
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}
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/*
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> ls
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command
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name: ls
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*/
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