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Method-style

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greg 2018-05-10 23:41:51 -07:00
parent c3be644133
commit 16a463b1a0
2 changed files with 38 additions and 27 deletions
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63
schala-lang/src/ast_reducing.rs
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@ -39,40 +39,51 @@ pub struct Func {
body: Vec<Stmt>, body: Vec<Stmt>,
} }
pub fn perform_ast_reduction(ast: &AST) -> Result<ReducedAST, String> { impl AST {
use parsing::Statement::*; pub fn reduce(&self) -> Result<ReducedAST, String> {
let mut output = vec![]; use parsing::Statement::*;
for statement in ast.0.iter() { let mut output = vec![];
match statement { for statement in self.0.iter() {
&ExpressionStatement(ref expr) => output.push(reduce_expr(expr)?), match statement {
&Declaration(ref decl) => output.push(reduce_decl(decl)?), &ExpressionStatement(ref expr) => output.push(expr.reduce()?),
&Declaration(ref decl) => output.push(decl.reduce()?),
}
} }
Ok(ReducedAST(output))
} }
Ok(ReducedAST(output))
} }
fn reduce_expr(expr: &Expression) -> Result<Stmt, String> { impl Expression {
use parsing::ExpressionType::*; fn reduce(&self) -> Result<Stmt, String> {
let ref input = expr.0; use parsing::ExpressionType::*;
let output_expr = match input { let ref input = self.0;
&IntLiteral(ref n) => Expr::Lit(Lit::Int(*n)), let output_expr = match input {
&FloatLiteral(ref f) => Expr::Lit(Lit::Float(*f)), &IntLiteral(ref n) => Expr::Lit(Lit::Int(*n)),
&StringLiteral(ref s) => Expr::Lit(Lit::StringLit(s.clone())), &FloatLiteral(ref f) => Expr::Lit(Lit::Float(*f)),
&BoolLiteral(ref b) => Expr::Lit(Lit::Bool(*b)), &StringLiteral(ref s) => Expr::Lit(Lit::StringLit(s.clone())),
&BinExp(ref binop, ref lhs, ref rhs) => reduce_binop(binop, lhs, rhs)?, &BoolLiteral(ref b) => Expr::Lit(Lit::Bool(*b)),
&PrefixExp(ref op, ref arg) => reduce_prefix(op, arg)?, &BinExp(ref binop, ref lhs, ref rhs) => binop.reduce(lhs, rhs)?,
e => return Err(format!("{:?} not implemented in reduction", e)) &PrefixExp(ref op, ref arg) => op.reduce(arg)?,
}; e => return Err(format!("{:?} not implemented in reduction", e))
Ok(Stmt::Expr(output_expr)) };
} Ok(Stmt::Expr(output_expr))
fn reduce_decl(expr: &Declaration) -> Result<Stmt, String> { }
Ok(Stmt::Expr(Expr::Lit(Lit::Int(0))))
} }
fn reduce_binop(binop: &BinOp, lhs: &Box<Expression>, rhs: &Box<Expression>) -> Result<Expr, String> { impl Declaration {
fn reduce(&self) -> Result<Stmt, String> {
Ok(Stmt::Expr(Expr::Lit(Lit::Int(0))))
}
}
impl BinOp {
fn reduce(&self, lhs: &Box<Expression>, rhs: &Box<Expression>) -> Result<Expr, String> {
Err(format!("NOTDONE")) Err(format!("NOTDONE"))
}
} }
fn reduce_prefix(op: &PrefixOp, arg: &Box<Expression>) -> Result<Expr, String> { impl PrefixOp {
fn reduce(&self, arg: &Box<Expression>) -> Result<Expr, String> {
Err(format!("NOTDONE")) Err(format!("NOTDONE"))
}
} }

2
schala-lang/src/lib.rs
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@ -95,7 +95,7 @@ fn typechecking(handle: &mut Schala, input: parsing::AST, comp: Option<&mut Unfi
type TempASTReduction = (ast_reducing::ReducedAST, parsing::AST); type TempASTReduction = (ast_reducing::ReducedAST, parsing::AST);
fn ast_reducing(handle: &mut Schala, input: parsing::AST, comp: Option<&mut UnfinishedComputation>) -> Result<TempASTReduction, String> { fn ast_reducing(handle: &mut Schala, input: parsing::AST, comp: Option<&mut UnfinishedComputation>) -> Result<TempASTReduction, String> {
let output = ast_reducing::perform_ast_reduction(&input)?; let output = input.reduce()?;
println!("REDUCED: {:?}", output); println!("REDUCED: {:?}", output);
Ok((output, input)) Ok((output, input))
} }