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feat(stdlib): Iter map/filter/fold with closures

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Add int-specialized higher-order Iter helpers that accept fat function
pointers, plus an example using named funcs and capturing closures.
Fix selfhost C backend pointer field access and Array Push indexing.
This commit is contained in:
dimgigov
2026-07-15 16:07:47 +03:00
parent 9efba57b4c
commit f1896183f5
6 changed files with 256 additions and 10 deletions
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src/c_backend.bux
+43 -8
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@@ -525,10 +525,24 @@ func CBE_EmitExpr(cbe: *CEmitter, node: *HirNode) {
return;
}
// Field access on value (direct dot): obj.field
// Field access: obj.field — use -> if base is a pointer
if kind == hFieldAccess {
CBE_EmitExpr(cbe, node.child1);
StringBuilder_Append(&cbe.sb, ".");
var isPtr: bool = false;
if node.child1 != null as *HirNode {
let childType: String = CBE_GetExprTypeName(cbe.mod, node.child1);
if String_EndsWith(childType, "*") {
isPtr = true;
}
if node.child1.kind == hVar && node.child1.typeKind == tyPointer {
isPtr = true;
}
}
if isPtr {
StringBuilder_Append(&cbe.sb, "->");
} else {
StringBuilder_Append(&cbe.sb, ".");
}
StringBuilder_Append(&cbe.sb, node.strValue);
return;
}
@@ -565,7 +579,7 @@ func CBE_EmitExpr(cbe: *CEmitter, node: *HirNode) {
}
// Index: arr[idx] — emit as arr[idx]
// For Array<T> desugar pattern (fieldPtr "data"), emit bounds-checked access
// For Array/Iter desugar pattern (fieldPtr "data"), emit bounds-checked access
if kind == hIndexPtr {
var isArrayAccess: bool = false;
if node.child1 != null as *HirNode {
@@ -574,12 +588,27 @@ func CBE_EmitExpr(cbe: *CEmitter, node: *HirNode) {
}
}
if isArrayAccess {
CBE_EmitExpr(cbe, node.child1.child1);
StringBuilder_Append(&cbe.sb, ".data[bux_index_check(");
// self.data[i] is a raw pointer index; Bux source inserts
// bux_bounds_check explicitly where needed (Array_Get). Do NOT
// re-check against .len here — Push writes at index == len.
let base: *HirNode = node.child1.child1;
var isPtr: bool = false;
if base != null as *HirNode {
let childType: String = CBE_GetExprTypeName(cbe.mod, base);
if String_EndsWith(childType, "*") {
isPtr = true;
}
if base.kind == hVar && base.typeKind == tyPointer {
isPtr = true;
}
}
let sep: String = ".";
if isPtr { sep = "->"; }
CBE_EmitExpr(cbe, base);
StringBuilder_Append(&cbe.sb, sep);
StringBuilder_Append(&cbe.sb, "data[");
CBE_EmitExpr(cbe, node.child2);
StringBuilder_Append(&cbe.sb, ", ");
CBE_EmitExpr(cbe, node.child1.child1);
StringBuilder_Append(&cbe.sb, ".len)]");
StringBuilder_Append(&cbe.sb, "]");
} else {
CBE_EmitExpr(cbe, node.child1);
StringBuilder_Append(&cbe.sb, "[");
@@ -755,6 +784,11 @@ func CBE_EmitFatFuncTypedefs(cbe: *CEmitter, mod: *HirModule) {
StringBuilder_Append(&cbe.sb, " int (*code)(void* env, int a0, int a1);\n");
StringBuilder_Append(&cbe.sb, " void* env;\n");
StringBuilder_Append(&cbe.sb, "} BuxFn_int_int_int;\n");
// (int)->bool
StringBuilder_Append(&cbe.sb, "typedef struct BuxFn_bool_int {\n");
StringBuilder_Append(&cbe.sb, " bool (*code)(void* env, int a0);\n");
StringBuilder_Append(&cbe.sb, " void* env;\n");
StringBuilder_Append(&cbe.sb, "} BuxFn_bool_int;\n");
// ()->void
StringBuilder_Append(&cbe.sb, "typedef struct BuxFn_void_void {\n");
StringBuilder_Append(&cbe.sb, " void (*code)(void* env);\n");
@@ -795,6 +829,7 @@ func CBE_MaybeEmitExtraFat(cbe: *CEmitter, name: String) {
// Skip ones we already emit as built-ins
if String_Eq(name, "BuxFn_int_int") { return; }
if String_Eq(name, "BuxFn_int_int_int") { return; }
if String_Eq(name, "BuxFn_bool_int") { return; }
if String_Eq(name, "BuxFn_void_void") { return; }
if String_Eq(name, "BuxFn_int_void") { return; }
CBE_EmitOneFatTypedef(cbe, name);