52 lines
1.3 KiB
Rust
52 lines
1.3 KiB
Rust
//! This example grabs input from stdin, lexes it, parses it, and prints the AST
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#![allow(unused_imports)]
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use conlang::{lexer::Lexer, parser::Parser, pretty_printer::PrettyPrintable, token::Token};
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use std::{
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error::Error,
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io::{stdin, IsTerminal, Read},
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path::{Path, PathBuf},
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};
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fn main() -> Result<(), Box<dyn Error>> {
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let conf = Config::new();
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if conf.paths.is_empty() {
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take_stdin()?;
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} else {
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for path in conf.paths.iter().map(PathBuf::as_path) {
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parse(&std::fs::read_to_string(path)?, Some(path));
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}
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}
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Ok(())
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}
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struct Config {
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paths: Vec<PathBuf>,
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}
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impl Config {
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fn new() -> Self {
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Config { paths: std::env::args().skip(1).map(PathBuf::from).collect() }
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}
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}
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fn take_stdin() -> Result<(), Box<dyn Error>> {
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if stdin().is_terminal() {
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for line in stdin().lines() {
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parse(&line?, None)
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}
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} else {
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parse(&std::io::read_to_string(stdin())?, None)
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}
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Ok(())
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}
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fn parse(file: &str, path: Option<&Path>) {
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use conlang::parser::error::Error;
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match Parser::from(Lexer::new(file)).parse() {
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Ok(ast) => ast.print(),
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Err(e) if e.start().is_some() => println!("{:?}:{}", path.unwrap_or(Path::new("-")), e),
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Err(e) => println!("{e}"),
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}
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println!();
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}
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