mirror of
https://github.com/teo3300/rust-mal.git
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7be624e032
Cleaning repl, removing multi-statement repl, further implementation as separated code from the rest Signed-off-by: teo3300 <matteo.rogora@live.it>
37 lines
909 B
Rust
37 lines
909 B
Rust
// Structure the main functions of the interpreter
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//
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// For now just act as an echo, note that each function should not modify the
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// input, thus this can be referenced by the previous step without the need
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// to allocate more memory
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use crate::printer::pr_str;
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use crate::reader::read_str;
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use crate::types::{MalRet, MalType};
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#[allow(non_snake_case)]
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/// Read input and generate an ast
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fn READ(input: &str) -> MalRet {
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match read_str(input) {
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Ok(ast) => Ok(ast),
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Err(err) => Err(format!("@ READ: {}", err)),
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}
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}
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#[allow(non_snake_case)]
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/// Evaluate the generated ast
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fn EVAL(ast: MalType) -> MalRet {
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Ok(ast)
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}
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#[allow(non_snake_case)]
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/// Print out the result of the evaluation
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fn PRINT(output: MalType) -> String {
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pr_str(&output, true)
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}
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pub fn rep(input: &str) -> Result<String, String> {
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let ast = READ(input)?;
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let out = EVAL(ast)?;
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Ok(PRINT(out))
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}
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