168 lines
3.8 KiB
Zig
168 lines
3.8 KiB
Zig
const std = @import("std");
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const tokens = @import("tokens.zig");
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const Token = tokens.Token;
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pub const NodeList = std.ArrayList(*Node);
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pub const ExprList = std.ArrayList(*Expr);
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pub const ParamList = std.ArrayList(ParamDecl);
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pub const ConstList = std.ArrayList(SingleConst);
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// TODO convert FnCall to something like PrefixOp / InfixOp / SuffixOp
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pub const NodeType = enum {
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Root,
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FnDecl,
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ConstDecl,
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Block,
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Expr,
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};
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pub const ParamDecl = struct {
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name: Token,
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// TODO types
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typ: Token,
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};
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pub const FnDecl = struct {
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func_name: Token,
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params: ParamList,
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body: ExprList,
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};
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pub const SingleConst = struct {
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name: Token,
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// TODO expr
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value: Token,
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};
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pub const BinaryExpr = struct {
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left: *Expr,
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op: Token,
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right: *Expr,
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};
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pub const UnaryExpr = struct {
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op: Token,
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right: *Expr,
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};
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pub const LiteralExpr = union(enum) {
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Bool: bool,
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Integer: []const u8,
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Float: []const u8,
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String: []const u8,
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};
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pub const Expr = union(enum) {
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Binary: BinaryExpr,
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Unary: UnaryExpr,
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Literal: LiteralExpr,
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Grouping: *Expr,
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};
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pub const Node = union(NodeType) {
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Root: NodeList,
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FnDecl: FnDecl,
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ConstDecl: ConstList,
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// TODO StmtList
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Block: ExprList,
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Expr: *Expr,
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};
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pub fn mkRoot(allocator: *std.mem.Allocator) !*Node {
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var node = try allocator.create(Node);
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node.* = Node{ .Root = NodeList.init(allocator) };
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return node;
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}
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fn printIdent(ident: usize) void {
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var i: usize = 0;
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while (i < ident) : (i += 1) {
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std.debug.warn("\t");
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}
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}
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fn print(ident: usize, comptime fmt: []const u8, args: ...) void {
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printIdent(ident);
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std.debug.warn(fmt, args);
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}
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pub fn printNode(node: *Node, ident: usize) void {
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switch (node.*) {
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.FnDecl => |decl| {
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print(ident, "FnDecl name='{}'\n", decl.func_name.lexeme);
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for (decl.params.toSlice()) |param| {
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print(
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ident + 1,
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"param: '{}' {}\n",
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param.name.lexeme,
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param.typ.lexeme,
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);
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}
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for (decl.body.toSlice()) |expr| {
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printIdent(ident + 1);
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printExpr(expr);
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std.debug.warn("\n");
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}
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},
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.ConstDecl => |consts| {
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print(ident, "ConstDecl ({} consts)\n", consts.len);
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for (consts.toSlice()) |const_decl| {
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print(
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ident + 1,
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"'{}' = '{}'\n",
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const_decl.name.lexeme,
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const_decl.value.lexeme,
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);
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}
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},
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.Root => {
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for (node.Root.toSlice()) |child| {
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printNode(child, ident + 1);
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}
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},
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.Expr => |expr| printExpr(expr),
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else => {
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print(ident, "unknown node: {}\n", node);
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},
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}
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}
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fn parenthetize(name: []const u8, exprs: []*Expr) void {
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std.debug.warn("({}", name);
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for (exprs) |expr| {
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std.debug.warn(" ");
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printExpr(expr);
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}
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std.debug.warn(")");
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}
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pub fn printExpr(expr: *Expr) void {
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switch (expr.*) {
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.Binary => |binary| parenthetize(binary.op.lexeme, &[_]*Expr{ binary.left, binary.right }),
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.Unary => |unary| parenthetize(unary.op.lexeme, &[_]*Expr{unary.right}),
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.Grouping => |expr_ptr| parenthetize("group", &[_]*Expr{expr_ptr}),
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.Literal => |literal| {
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switch (literal) {
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.Bool => |val| std.debug.warn("{}", val),
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.Integer => |val| std.debug.warn("{}", val),
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.Float => |val| std.debug.warn("{}", val),
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.String => |val| std.debug.warn("'{}'", val),
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}
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},
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else => std.debug.warn("unknown"),
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}
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}
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