New direction

compiler/src/declass/mod.rs

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+//! declass: ES classes become prototype form, one algo step per file.
+//!
+//! The steps follow declass_algo.txt:
+//!
+//!   step_1  rewrite how a class is built (per function).
+//!   step_2  splice the field initialiser into the constructor.
+//!   step_3  fix the constructor header: rename, drop the capture (to come).
+
+mod step_1;
+mod step_2;
+
+use crate::{parse::Atom, regify::RegFn};
+
+/// A class's constructor and its hoisted field initialiser, as fn ids into the
+/// flat function list. Read by step 1, consumed by step 2.
+#[derive(Clone, Copy)]
+struct FieldInit {
+    ctor: usize,
+    fields: usize,
+}
+
+pub fn declass(reg_fns: Vec<RegFn>, _atoms: &[Atom]) -> Vec<RegFn> {
+    // Read the constructor <-> field-initialiser links before step 1 rewrites
+    // the class builds that carry them.
+    let field_inits = step_1::field_init_links(&reg_fns);
+
+    let mut reg_fns: Vec<RegFn> = reg_fns.into_iter().map(step_1::rewrite).collect();
+
+    step_2::splice(&mut reg_fns, &field_inits);
+    reg_fns
+}