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Add support for basic lambda syntax

This commit is contained in:
kayomn 2023-08-26 16:00:17 +01:00
parent 0e26b8acde
commit f5ed4bbcad
4 changed files with 157 additions and 44 deletions
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12
debug/app.ona
View File

@ -1,18 +1,22 @@
var i = 0
let pr = lambda ():
@print("foo")
end
while i < 5:
@print("hello, world")
pr("hello, world")
i = i + 1
end
if i > 6:
@print("`i` greater than `6`")
pr("`i` greater than `6`")
elif i == 4:
@print("`i` is equal to `4`")
pr("`i` is equal to `4`")
else:
@print("i'unno")
pr("i'unno")
end
return {

117
source/ona/kym.zig
View File

@ -33,6 +33,7 @@ pub const RuntimeEnv = struct {
float: Float,
string: []const coral.io.Byte,
symbol: []const coral.io.Byte,
chunk: Chunk,
};
const Opcode = union (enum) {
@ -124,17 +125,35 @@ pub const RuntimeEnv = struct {
});
},
.table_literal => |fields| {
if (fields.values.len > coral.math.max_int(@typeInfo(u32).Int)) {
.table_literal => |literal| {
if (literal.values.len > coral.math.max_int(@typeInfo(u32).Int)) {
return error.OutOfMemory;
}
for (fields.values) |field| {
for (literal.values) |field| {
try self.compile_expression(chunk, field.value_expression);
try self.compile_expression(chunk, field.key_expression);
}
try chunk.opcodes.push_one(.{.push_table = @intCast(fields.values.len)});
try chunk.opcodes.push_one(.{.push_table = @intCast(literal.values.len)});
},
.lambda_literal => |literal| {
if (literal.argument_identifiers.values.len > coral.math.max_int(@typeInfo(u32).Int)) {
return error.OutOfMemory;
}
var lambda_chunk = try Chunk.make(chunk.env, "<lambda>");
errdefer lambda_chunk.free();
try lambda_chunk.compile(literal.block_statements.values);
try chunk.opcodes.push_one(.{
.push_const = try chunk.declare_constant(.{
.chunk = lambda_chunk,
}),
});
},
.binary_operation => |operation| {
@ -374,9 +393,18 @@ pub const RuntimeEnv = struct {
fn compile(self: *Chunk, statements: []const ast.Statement) RuntimeError!void {
var unit = CompilationUnit{};
var has_returned = false;
for (statements) |statement| {
try unit.compile_statement(self, statement);
if (statement == .@"return") {
has_returned = true;
}
}
if (!has_returned) {
try self.opcodes.push_one(.push_nil);
}
}
@ -385,27 +413,27 @@ pub const RuntimeEnv = struct {
return self.env.raise(error.BadSyntax, "chunks cannot contain more than 65,535 constants");
}
const constant_index = self.constants.values.len;
try self.constants.push_one(try switch (constant) {
const constant_object = try switch (constant) {
.fixed => |fixed| self.env.new_fixed(fixed),
.float => |float| self.env.new_float(float),
.string => |string| self.env.new_string(string),
.symbol => |symbol| self.env.new_symbol(symbol),
});
return @intCast(constant_index);
.chunk => |chunk| self.env.new_dynamic(coral.io.bytes_of(&chunk).ptr, &.{
.size = @sizeOf(Chunk),
.name = "lambda",
.destruct = typeinfo_destruct,
.call = typeinfo_call,
}),
};
errdefer self.env.discard(constant_object);
try self.constants.push_one(constant_object);
return @intCast(self.constants.values.len - 1);
}
fn execute(self: *Chunk) RuntimeError!?*RuntimeRef {
try self.env.frames.push_one(.{
.arg_count = 0,
.locals_top = self.env.locals.values.len,
.name = self.name,
});
defer coral.debug.assert(self.env.frames.pop() != null);
var opcode_cursor = @as(u32, 0);
while (opcode_cursor < self.opcodes.values.len) : (opcode_cursor += 1) {
@ -547,14 +575,16 @@ pub const RuntimeEnv = struct {
defer self.env.discard(callable);
try self.env.frames.push_one(.{
.name = "<lambda>",
.name = "<chunk>",
.arg_count = object_call,
.locals_top = self.env.locals.values.len,
});
defer coral.debug.assert(self.env.frames.pop() != null);
break: call try switch (callable.object().payload) {
const payload = callable.object().payload;
break: call try switch (payload) {
.syscall => |syscall| syscall(self.env),
.dynamic => |dynamic| dynamic.typeinfo().call(.{
@ -566,18 +596,18 @@ pub const RuntimeEnv = struct {
};
};
for (0 .. object_call) |_| {
if (try self.pop_local()) |popped_arg| {
self.env.discard(popped_arg);
}
}
errdefer {
if (result) |ref| {
self.env.discard(ref);
}
}
for (0 .. object_call) |_| {
if (try self.pop_local()) |popped_arg| {
self.env.discard(popped_arg);
}
}
try self.env.locals.push_one(result);
},
@ -934,6 +964,14 @@ pub const RuntimeEnv = struct {
fn pop_local(self: *Chunk) RuntimeError!?*RuntimeRef {
return self.env.locals.pop() orelse self.env.raise(error.IllegalState, "stack underflow");
}
fn typeinfo_call(method: Typeinfo.Method) RuntimeError!?*RuntimeRef {
return @as(*Chunk, @ptrCast(@alignCast(method.userdata))).execute();
}
fn typeinfo_destruct(method: Typeinfo.Method) void {
@as(*Chunk, @ptrCast(@alignCast(method.userdata))).free();
}
};
const ConstList = coral.list.Stack(*RuntimeRef);
@ -967,7 +1005,7 @@ pub const RuntimeEnv = struct {
contiguous: RefList,
fn typeinfo_destruct(method: Typeinfo.Method) void {
const table = @as(*Table, @ptrCast(@alignCast(method.userdata.ptr)));
const table = @as(*Table, @ptrCast(@alignCast(method.userdata)));
{
var field_iterable = table.associative.as_iterable();
@ -990,7 +1028,7 @@ pub const RuntimeEnv = struct {
}
fn typeinfo_get(method: Typeinfo.Method, index: *const RuntimeRef) RuntimeError!?*RuntimeRef {
const table = @as(*Table, @ptrCast(@alignCast(method.userdata.ptr)));
const table = @as(*Table, @ptrCast(@alignCast(method.userdata)));
const acquired_index = try method.env.acquire(index);
defer method.env.discard(acquired_index);
@ -1014,7 +1052,7 @@ pub const RuntimeEnv = struct {
}
fn typeinfo_set(method: Typeinfo.Method, index: *const RuntimeRef, value: ?*const RuntimeRef) RuntimeError!void {
const table = @as(*Table, @ptrCast(@alignCast(method.userdata.ptr)));
const table = @as(*Table, @ptrCast(@alignCast(method.userdata)));
const acquired_index = try method.env.acquire(index);
errdefer method.env.discard(acquired_index);
@ -1079,19 +1117,14 @@ pub const RuntimeEnv = struct {
return null;
}
pub fn bind_system(self: *RuntimeEnv, name: []const coral.io.Byte, value: *const RuntimeRef) RuntimeError!void {
const name_symbol = try self.new_symbol(name);
pub fn acquire_args(self: *RuntimeEnv) RuntimeError!*RuntimeRef {
const frame = self.frames.peek() orelse return self.raise(error.IllegalState, "stack underflow");
errdefer self.discard(name_symbol);
_ = frame;
const acquired_value = try self.acquire(value);
const args_table = self.new_table();
errdefer self.discard(acquired_value);
if (try self.system_bindings.replace(name_symbol, acquired_value)) |replaced| {
self.discard(replaced.key);
self.discard(replaced.value);
}
return args_table;
}
pub fn call(self: *RuntimeEnv, callable: *RuntimeRef, args: []const *RuntimeRef) RuntimeError!?*RuntimeRef {
@ -1172,6 +1205,14 @@ pub const RuntimeEnv = struct {
error.OutOfMemory => error.OutOfMemory,
});
try self.frames.push_one(.{
.name = file_name,
.arg_count = 0,
.locals_top = self.locals.values.len,
});
defer coral.debug.assert(self.frames.pop() != null);
return chunk.execute();
}

64
source/ona/kym/ast.zig
View File

@ -74,6 +74,11 @@ pub const Expression = union (enum) {
table_literal: TableLiteral,
grouped_expression: *Expression,
lambda_literal: struct {
argument_identifiers: IdentifierList,
block_statements: Statement.List,
},
local_get: struct {
identifier: []const coral.io.Byte,
},
@ -136,6 +141,8 @@ pub const DeclarationStorage = enum {
const ExpressionBuilder = fn (self: *Tree) ParseError!Expression;
const IdentifierList = coral.list.Stack([]const coral.io.Byte);
pub const ParseError = error {
OutOfMemory,
BadSyntax,
@ -221,8 +228,6 @@ pub const Tree = struct {
fn parse_branch(self: *Tree) ParseError!Statement {
const allocator = self.arena.as_allocator();
defer self.tokenizer.skip_newlines();
self.tokenizer.step();
const condition_expression = try self.parse_expression();
@ -238,6 +243,8 @@ pub const Tree = struct {
while (true) {
switch (self.tokenizer.token) {
.keyword_end => {
self.tokenizer.skip_newlines();
return .{
.@"if" = .{
.condition_expression = condition_expression,
@ -262,6 +269,8 @@ pub const Tree = struct {
try else_statements.push_one(try self.parse_statement());
}
self.tokenizer.skip_newlines();
return .{
.@"if" = .{
.else_statement = try coral.io.allocate_one(allocator, Statement{.block = else_statements}),
@ -404,6 +413,57 @@ pub const Tree = struct {
break: parse .{.builtin = builtin};
},
.keyword_lambda => {
self.tokenizer.skip_newlines();
if (self.tokenizer.token != .symbol_paren_left) {
return self.report("expected `(` after opening lambda block");
}
var argument_identifiers = IdentifierList.make(allocator);
while (true) {
self.tokenizer.skip_newlines();
switch (self.tokenizer.token) {
.identifier => |identifier| try argument_identifiers.push_one(identifier),
.symbol_paren_right => break,
else => return self.report("expected identifier or closing `)` in argument list"),
}
self.tokenizer.skip_newlines();
switch (self.tokenizer.token) {
.symbol_comma => continue,
.symbol_paren_right => break,
else => return self.report("expected `,` or closing `)` after identifier in argument list"),
}
}
self.tokenizer.skip_newlines();
if (self.tokenizer.token != .symbol_colon) {
return self.report("expected `:` after closing `)` of lambda block argument list");
}
self.tokenizer.skip_newlines();
var block_statements = Statement.List.make(allocator);
while (self.tokenizer.token != .keyword_end) {
try block_statements.push_one(try self.parse_statement());
}
self.tokenizer.skip_newlines();
break: parse .{
.lambda_literal = .{
.argument_identifiers = argument_identifiers,
.block_statements = block_statements,
},
};
},
.symbol_brace_left => {
var table_literal = Expression.TableLiteral.make(allocator);

8
source/ona/kym/tokens.zig
View File

@ -46,6 +46,7 @@ pub const Token = union(enum) {
keyword_elif,
keyword_var,
keyword_let,
keyword_lambda,
pub fn text(self: Token) []const coral.io.Byte {
return switch (self) {
@ -95,6 +96,7 @@ pub const Token = union(enum) {
.keyword_else => "else",
.keyword_var => "var",
.keyword_let => "let",
.keyword_lambda => "lambda",
};
}
};
@ -234,6 +236,12 @@ pub const Tokenizer = struct {
},
'l' => {
if (coral.io.ends_with(identifier, "ambda")) {
self.token = .keyword_lambda;
return;
}
if (coral.io.ends_with(identifier, "et")) {
self.token = .keyword_let;