mirror of
https://github.com/teo3300/rust-mal.git
synced 2026-01-13 01:35:31 +01:00
9d35d24cd4
- Error handling to signal what is preventing evaluation instead of
program crash
- Small editor feature (allow edit new
line of code to complete the previous ones instead of destroying the
input, if an empty line inserted return the error preventing evaluation
- Auto indentation on multiline input based on depth
Still does not parse multi-statement code
- This is a problem when dealing with macros: does not allow
expressions like `'()` since the atomic `'` hides the list ().
Need to chose between:
- Replace `'...` with `(quote ... )` during tokenization (may be
hard to implement macros later)
- Allows multi-statement code (this also allows to execute multiple
statements when reading a file)
Will probably delete auto-indentation since it breaks code's uniformity
too much
42 lines
1.2 KiB
Rust
42 lines
1.2 KiB
Rust
use crate::types::escape_str;
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use crate::types::MalType;
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use crate::types::MalType::*;
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pub fn pr_str(ast: &MalType, print_readably: bool) -> String {
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match ast {
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Nil => "nil".to_string(),
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Symbol(sym) | Keyword(sym) => sym.to_string(),
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Int(val) => val.to_string(),
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Bool(val) => val.to_string(),
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Str(str) => {
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if print_readably {
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escape_str(str)
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} else {
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str.to_string()
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}
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}
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List(el) => format!(
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"({})",
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el.iter()
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.map(|e| pr_str(e, print_readably))
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.collect::<Vec<String>>()
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.join(" ")
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),
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// This is truly horrible
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Vector(el) => format!(
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"[{}]",
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el.iter()
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.map(|e| pr_str(e, print_readably))
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.collect::<Vec<String>>()
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.join(" ")
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),
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Map(el) => format!(
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"{{{}}}",
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el.iter()
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.map(|sub| vec![sub.0.to_string(), pr_str(sub.1, print_readably)].join(" "))
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.collect::<Vec<String>>()
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.join(" ")
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),
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}
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}
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