44 lines
968 B
Rust
44 lines
968 B
Rust
use parser::{AST, ASTNode};
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pub struct Evaluator {
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data: bool,
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}
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impl Evaluator {
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pub fn new() -> Evaluator {
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Evaluator { data: false }
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}
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pub fn run(&mut self, ast: AST) -> Vec<String> {
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ast.into_iter().map(|astnode| {
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self.reduce_node(astnode)
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}).collect()
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}
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}
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impl Evaluator {
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fn reduce_node(&mut self, mut node: ASTNode) -> String {
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loop {
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let (newnode, finished) = self.step(node);
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node = newnode;
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if finished {
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break
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}
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}
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format!("{:?}", node) //TODO make better
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}
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fn step(&mut self, node: ASTNode) -> (ASTNode, bool) {
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use parser::ASTNode::*;
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use parser::Expression::*;
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println!("Doing one step");
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match node {
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n@ExprNode(StringLiteral(_)) => (n, true),
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n@ExprNode(Number(_)) => (n, true),
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_ => unimplemented!(),
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}
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}
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}
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