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9 changed files with 144 additions and 219 deletions
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1
README.md
View File

@ -37,6 +37,7 @@ negatively charged towards
## wip
- no `for` yet
- no `map` yet
- no `in` yet (probably will be dropped)
- no `module`, `import` yet

5
examples/hello.v
View File

@ -17,8 +17,6 @@ fn main(a int) int {
mut a := 1+2
a = 2
a = 1 && 0
if a {
println(30)
} else {
@ -65,9 +63,6 @@ fn main(a int) int {
str.len /= 1
awoo := [1, 2, a(), b + 2, c(31) * d]
for a in b {}
for idx, a in b {}
}
fn (v Typ) voidfunc() {}

22
src/ast.zig
View File

@ -158,20 +158,12 @@ pub const LoopStmt = struct {
then_branch: Block,
};
pub const ForStmt = struct {
index: ?Token,
value: Token,
array: Token,
block: Block,
};
pub const Stmt = union(enum) {
Expr: *Expr,
Println: *Expr,
If: IfStmt,
Loop: LoopStmt,
For: ForStmt,
Return: ReturnStmt,
@ -220,20 +212,6 @@ pub const Stmt = union(enum) {
return stmt;
}
pub fn mkFor(allocator: *std.mem.Allocator, index: ?Token, value: Token, array: Token, block: Block) !*Stmt {
var stmt = try allocator.create(Stmt);
stmt.* = Stmt{
.For = ForStmt{
.index = index,
.value = value,
.array = array,
.block = block,
},
};
return stmt;
}
pub fn mkReturn(allocator: *std.mem.Allocator, tok: Token, value: *Expr) !*Stmt {
var stmt = try allocator.create(Stmt);
stmt.* = Stmt{

189
src/ast_printer.zig
View File

@ -9,28 +9,28 @@ const warn = std.debug.warn;
fn printIdent(ident: usize) void {
var i: usize = 0;
while (i < ident) : (i += 1) {
std.debug.warn("\t", .{});
std.debug.warn("\t");
}
}
fn print(ident: usize, comptime fmt: []const u8, args: anytype) void {
fn print(ident: usize, comptime fmt: []const u8, args: ...) void {
printIdent(ident);
std.debug.warn(fmt, args);
}
fn printBlock(ident: usize, block: anytype, endNewline: bool) void {
std.debug.warn("(\n", .{});
fn printBlock(ident: usize, block: var, endNewline: bool) void {
std.debug.warn("(\n");
for (block.items) |stmt| {
for (block.toSlice()) |stmt| {
printIdent(ident);
printStmt(ident, stmt);
std.debug.warn("\n", .{});
std.debug.warn("\n");
}
if (endNewline) {
print(ident - 1, ")\n", .{});
print(ident - 1, ")\n");
} else {
print(ident - 1, ")", .{});
print(ident - 1, ")");
}
}
@ -48,51 +48,55 @@ pub fn printNode(node: *Node, ident: usize) void {
const typ = method.typ.lexeme;
if (method.mutable) {
warn("(method mut {} {} {} {} ", .{ vari, typ, name, ret_type });
warn("(method mut {} {} {} {} ", vari, typ, name, ret_type);
} else {
warn("(method {} {} {} {} ", .{ vari, typ, name, ret_type });
warn("(method {} {} {} {} ", vari, typ, name, ret_type);
}
} else {
warn("(fn {} {} (", .{ name, ret_type });
warn("(fn {} {} (", name, ret_type);
}
for (decl.params.items) |param| {
warn("({} {}) ", .{ param.name.lexeme, param.typ.lexeme });
for (decl.params.toSlice()) |param| {
warn("({} {}) ", param.name.lexeme, param.typ.lexeme);
}
printBlock(ident + 1, decl.body, false);
warn(")\n", .{});
warn(")\n");
},
.ConstDecl => |consts| {
print(ident, "(const (\n", .{});
print(ident, "(const (\n");
for (consts.items) |const_decl| {
print(ident + 1, "({} ", .{
for (consts.toSlice()) |const_decl| {
print(
ident + 1,
"({} ",
const_decl.name.lexeme,
});
);
printExpr(const_decl.expr);
std.debug.warn(")\n", .{});
std.debug.warn(")\n");
}
print(ident, "))\n", .{});
print(ident, "))\n");
},
.Enum => |decl| {
print(ident, "(enum {} (\n", .{decl.name.lexeme});
print(ident, "(enum {} (\n", decl.name.lexeme);
for (decl.fields.items) |field| {
print(ident + 1, "{}\n", .{
for (decl.fields.toSlice()) |field| {
print(
ident + 1,
"{}\n",
field.lexeme,
});
);
}
print(ident, "))\n", .{});
print(ident, "))\n");
},
.Root => {
for (node.Root.items) |child| {
for (node.Root.toSlice()) |child| {
printNode(child, ident + 1);
}
},
@ -100,129 +104,129 @@ pub fn printNode(node: *Node, ident: usize) void {
.Stmt => |stmt| {
printIdent(ident);
printStmt(ident, stmt);
std.debug.warn("\n", .{});
std.debug.warn("\n");
},
.Struct => |struc| {
print(ident, "(struct {} (\n", .{struc.name.lexeme});
for (struc.fields.items) |field| {
print(ident, "(struct {} (\n", struc.name.lexeme);
for (struc.fields.toSlice()) |field| {
printIdent(ident + 1);
if (field.mutable) {
std.debug.warn("(mut ", .{});
std.debug.warn("(mut ");
} else {
std.debug.warn("(", .{});
std.debug.warn("(");
}
if (field.public) {
std.debug.warn("pub ", .{});
std.debug.warn("pub ");
}
if (field.mutable_outside) {
std.debug.warn("MUT_OUT ", .{});
std.debug.warn("MUT_OUT ");
}
std.debug.warn("{} {})\n", .{ field.name.lexeme, field.typ.lexeme });
std.debug.warn("{} {})\n", field.name.lexeme, field.typ.lexeme);
}
print(ident, "))\n", .{});
print(ident, "))\n");
},
else => {
print(ident, "unknown node: {}\n", .{node});
print(ident, "unknown node: {}\n", node);
},
}
}
fn parenthetize(name: []const u8, exprs: []*const Expr) void {
std.debug.warn("({}", .{name});
fn parenthetize(name: []const u8, exprs: []*Expr) void {
std.debug.warn("({}", name);
for (exprs) |expr| {
std.debug.warn(" ", .{});
std.debug.warn(" ");
printExpr(expr);
}
std.debug.warn(")", .{});
std.debug.warn(")");
}
pub fn printExpr(expr: *const Expr) void {
pub fn printExpr(expr: *Expr) void {
switch (expr.*) {
.Binary => |binary| parenthetize(binary.op.lexeme, &[_]*const Expr{ binary.left, binary.right }),
.Logical => |binary| parenthetize(binary.op.lexeme, &[_]*const Expr{ binary.left, binary.right }),
.Unary => |unary| parenthetize(unary.op.lexeme, &[_]*const Expr{unary.right}),
.Grouping => |expr_ptr| parenthetize("group", &[_]*const Expr{expr_ptr}),
.Binary => |binary| parenthetize(binary.op.lexeme, &[_]*Expr{ binary.left, binary.right }),
.Logical => |binary| parenthetize(binary.op.lexeme, &[_]*Expr{ binary.left, binary.right }),
.Unary => |unary| parenthetize(unary.op.lexeme, &[_]*Expr{unary.right}),
.Grouping => |expr_ptr| parenthetize("group", &[_]*Expr{expr_ptr}),
.Literal => |literal| {
switch (literal) {
.Bool => |val| std.debug.warn("{}", .{val}),
.Integer => |val| std.debug.warn("{}", .{val}),
.Float => |val| std.debug.warn("{}", .{val}),
.String => |val| std.debug.warn("'{}'", .{val}),
.Bool => |val| std.debug.warn("{}", val),
.Integer => |val| std.debug.warn("{}", val),
.Float => |val| std.debug.warn("{}", val),
.String => |val| std.debug.warn("'{}'", val),
.Array => |exprs| {
parenthetize("array", exprs.items);
parenthetize("array", exprs.toSlice());
},
else => |typ| std.debug.warn("UnknownLiteral-{}", .{typ}),
else => |typ| std.debug.warn("UnknownLiteral-{}", typ),
}
},
.Variable => |token| std.debug.warn("{}", .{token.lexeme}),
.Variable => |token| std.debug.warn("{}", token.lexeme),
.VarDecl => |decl| {
if (decl.mutable) {
std.debug.warn("(mut ", .{});
std.debug.warn("(mut ");
} else {
std.debug.warn("(", .{});
std.debug.warn("(");
}
std.debug.warn("let {} ", .{decl.assign.name.lexeme});
std.debug.warn("let {} ", decl.assign.name.lexeme);
printExpr(decl.assign.value);
std.debug.warn(")", .{});
std.debug.warn(")");
},
.Assign => |assign| {
std.debug.warn("(set ", .{});
std.debug.warn("{} ", .{assign.name.lexeme});
std.debug.warn("(set ");
std.debug.warn("{} ", assign.name.lexeme);
printExpr(assign.value);
std.debug.warn(")", .{});
std.debug.warn(")");
},
.Call => |call| {
std.debug.warn("(", .{});
std.debug.warn("(");
printExpr(call.callee);
for (call.arguments.items) |arg| {
std.debug.warn(" ", .{});
for (call.arguments.toSlice()) |arg| {
std.debug.warn(" ");
printExpr(arg);
}
std.debug.warn(")", .{});
std.debug.warn(")");
},
.Struct => |val| {
std.debug.warn("({} (", .{val.name.lexeme});
std.debug.warn("({} (", val.name.lexeme);
for (val.inits.items) |init| {
std.debug.warn(" ({} ", .{init.field.lexeme});
for (val.inits.toSlice()) |init| {
std.debug.warn(" ({} ", init.field.lexeme);
printExpr(init.expr);
std.debug.warn(")", .{});
std.debug.warn(")");
}
std.debug.warn("))", .{});
std.debug.warn("))");
},
.Get => |get| {
warn("(", .{});
warn("(");
printExpr(get.struc);
warn("{}", .{get.name.lexeme});
warn(".{})", get.name.lexeme);
},
.Set => |set| {
warn("(set ", .{});
warn("(set ");
printExpr(set.struc);
warn(" {} ", .{set.field.lexeme});
warn(" {} ", set.field.lexeme);
printExpr(set.value);
warn(")", .{});
warn(")");
},
else => std.debug.warn("UnknownExpr-{}", .{@tagName(expr.*)}),
else => std.debug.warn("UnknownExpr-{}", @tagName(expr.*)),
}
}
@ -232,53 +236,38 @@ pub fn printStmt(ident: usize, stmt: *Stmt) void {
.Expr => |expr| printExpr(expr),
.If => |ifstmt| {
std.debug.warn("(if ", .{});
std.debug.warn("(if ");
printExpr(ifstmt.condition);
std.debug.warn(" ", .{});
std.debug.warn(" ");
printBlock(ident + 1, ifstmt.then_branch, false);
if (ifstmt.else_branch) |else_branch| {
std.debug.warn(" else ", .{});
std.debug.warn(" else ");
printBlock(ident + 1, else_branch, false);
}
std.debug.warn(")\n", .{});
std.debug.warn(")\n");
},
.Loop => |loop| {
std.debug.warn("(loop ", .{});
std.debug.warn("(loop ");
if (loop.condition) |cond| {
printExpr(cond);
} else {
std.debug.warn("true", .{});
std.debug.warn("true");
}
std.debug.warn(" ", .{});
std.debug.warn(" ");
printBlock(ident + 1, loop.then_branch, false);
std.debug.warn(")\n", .{});
},
.For => |forstmt| {
std.debug.warn("(for ", .{});
if (forstmt.index) |index| {
std.debug.warn("({} {}) ", .{ index.lexeme, forstmt.value.lexeme });
} else {
std.debug.warn("{} ", .{forstmt.value.lexeme});
}
std.debug.warn("{} ", .{forstmt.array.lexeme});
printBlock(ident + 1, forstmt.block, false);
std.debug.warn(")\n", .{});
std.debug.warn(")\n");
},
.Return => |ret| {
std.debug.warn("(return ", .{});
std.debug.warn("(return ");
printExpr(ret.value);
std.debug.warn(")\n", .{});
std.debug.warn(")\n");
},
else => std.debug.warn("UnknownStmt-{}", .{@tagName(stmt.*)}),
else => std.debug.warn("UnknownStmt-{}", @tagName(stmt.*)),
}
}

8
src/errors.zig
View File

@ -1,14 +1,14 @@
const std = @import("std");
pub fn report(line: usize, where: []const u8, message: []const u8) void {
std.debug.warn("[line {}] Error{}: {}", .{ line, where, message });
std.debug.warn("[line {}] Error{}: {}", line, where, message);
}
pub fn reportN(line: usize, message: []const u8) void {
report(line, "", message);
}
pub fn reportFmt(line: usize, comptime fmt: []const u8, args: anytype) void {
std.debug.warn("[line {}] Error", .{line});
pub fn reportFmt(line: usize, comptime fmt: []const u8, args: ...) void {
std.debug.warn("[line {}] Error", line);
std.debug.warn(fmt, args);
std.debug.warn("\n", .{});
std.debug.warn("\n");
}

42
src/main.zig
View File

@ -10,16 +10,18 @@ pub const Result = error{
CompileError,
};
fn run(allocator: *Allocator, data: []const u8) !void {
var stdout_file = std.io.getStdOut();
const stdout = stdout_file.outStream();
pub const StdOut = *std.io.OutStream(std.fs.File.WriteError);
fn run(allocator: *Allocator, data: []u8) !void {
var stdout_file = try std.io.getStdOut();
const stdout = &stdout_file.outStream().stream;
var runner = runners.Runner.init(allocator, stdout);
return runner.execute(data);
}
fn runFile(allocator: *Allocator, path: []const u8) !void {
var file = try std.fs.cwd().openFile(path, .{});
var file = try std.fs.File.openRead(path);
defer file.close();
const total_bytes = try file.getEndPos();
@ -37,32 +39,26 @@ fn runFile(allocator: *Allocator, path: []const u8) !void {
}
fn runPrompt(allocator: *Allocator) !void {
var stdout_file = std.io.getStdOut();
const stdout = stdout_file.outStream();
var stdin_file = std.io.getStdIn();
const stdin = stdin_file.inStream();
var line_buf: [1024]u8 = undefined;
var stdout_file = try std.io.getStdOut();
const stdout = &stdout_file.outStream().stream;
while (true) {
try stdout.print("> ", .{});
try stdout.print("> ");
var buffer = try std.Buffer.init(allocator, ""[0..]);
const amt = try stdin.read(&line_buf);
if (amt == line_buf.len) {
try stdout.print("Input too long.\n", .{});
continue;
}
const line = std.mem.trimRight(u8, line_buf[0..amt], "\r\n");
var line = std.io.readLine(&buffer) catch |err| {
if (err == error.EndOfStream) return;
return err;
};
run(allocator, line) catch |err| {
switch (err) {
Result.Ok => {},
Result.ScannerError => blk: {
try stdout.print("scanner error.\n", .{});
try stdout.print("scanner error.\n");
},
Result.CompileError => blk: {
try stdout.print("compile error.\n", .{});
try stdout.print("compile error.\n");
},
else => return err,
}
@ -71,12 +67,12 @@ fn runPrompt(allocator: *Allocator) !void {
}
pub fn main() anyerror!void {
var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
var arena = std.heap.ArenaAllocator.init(std.heap.direct_allocator);
defer arena.deinit();
var allocator = &arena.allocator;
var stdout_file = std.io.getStdOut();
var stdout = stdout_file.outStream();
var stdout_file = try std.io.getStdOut();
var stdout = &stdout_file.outStream().stream;
var args_it = std.process.args();

73
src/parser.zig
View File

@ -43,27 +43,27 @@ pub const Parser = struct {
self.tokens.deinit();
}
fn doError(self: *Parser, comptime fmt: []const u8, args: anytype) void {
fn doError(self: *Parser, comptime fmt: []const u8, args: ...) void {
self.hadError = true;
std.debug.warn("parser error at line {}\n\t", .{self.scanner.line});
std.debug.warn("parser error at line {}\n\t", self.scanner.line);
std.debug.warn(fmt, args);
std.debug.warn("\n", .{});
std.debug.warn("\n");
}
fn peek(self: *Parser) Token {
return self.tokens.items[self.tokens.items.len - 1];
return self.tokens.at(self.tokens.len - 1);
}
fn previous(self: *Parser) Token {
return self.tokens.items[self.tokens.items.len - 2];
return self.tokens.at(self.tokens.len - 2);
}
fn tokenError(self: *Parser, token: Token, msg: []const u8) Result!void {
if (token.ttype == .EOF) {
err.report(token.line, " at end", msg);
} else {
err.reportFmt(token.line, " at '{}': {}", .{ token.lexeme, msg });
err.reportFmt(token.line, " at '{}': {}", token.lexeme, msg);
}
return Result.CompileError;
@ -90,7 +90,7 @@ pub const Parser = struct {
}
try self.tokens.append(token);
std.debug.warn("skip to {}\n", .{token});
std.debug.warn("skip to {}\n", token);
return token;
}
@ -117,17 +117,19 @@ pub const Parser = struct {
// TODO maybe this could be entirely comptime?
var buf_main: [1000]u8 = undefined;
var buf = try std.fmt.bufPrint(buf_main[0..], "expected {}, got {}", .{
var buf = try std.fmt.bufPrint(
buf_main[0..],
"expected {}, got {}",
ttype,
self.peek().ttype,
});
);
try self.tokenError(self.peek(), buf);
return Result.CompileError;
}
/// check() against multiple tokens
fn compareAnyOf(self: *@This(), ttypes: []const TokenType) bool {
fn compareAnyOf(self: *@This(), ttypes: []TokenType) bool {
for (ttypes) |ttype| {
if (self.check(ttype)) return true;
}
@ -189,7 +191,7 @@ pub const Parser = struct {
}
fn mkUnary(self: *Parser, op: Token, right: *Expr) !*Expr {
std.debug.warn("Unary\n", .{});
std.debug.warn("Unary\n");
var expr = try self.allocator.create(Expr);
expr.* = Expr{
@ -607,7 +609,7 @@ pub const Parser = struct {
.Enum => try self.parseEnumDecl(),
else => |ttype| blk: {
self.doError("expected Fn, Const, Struct, got {}\n", .{ttype});
self.doError("expected Fn, Const, Struct, got {}\n", ttype);
return Result.CompileError;
},
};
@ -634,7 +636,6 @@ pub const Parser = struct {
return switch (self.peek().ttype) {
.If => try self.parseIfStmt(),
.Loop => try self.parseLoop(),
.For => try self.parseForStmt(),
.Println => try self.parsePrintln(),
.Return => try self.parseReturn(),
else => try self.parseStmtExpr(),
@ -674,42 +675,6 @@ pub const Parser = struct {
);
}
fn parseForStmt(self: *@This()) !*Stmt {
// There are two types of for in vig's V subset:
// - for x in y
// - for idx, x in y
_ = try self.consumeSingle(.For);
var index_var: ?Token = null;
var value_var: Token = undefined;
const subject_1 = try self.consumeSingle(.Identifier);
if (self.check(.Comma)) {
_ = try self.consumeSingle(.Comma);
const subject_2 = try self.consumeSingle(.Identifier);
index_var = subject_1;
value_var = subject_2;
} else {
value_var = subject_1;
}
_ = try self.consumeSingle(.In);
// MUST be identifier
var array = try self.consumeSingle(.Identifier);
var block = try self.parseStmtBlock();
return try Stmt.mkFor(
self.allocator,
index_var,
value_var,
array,
block,
);
}
fn parseLoop(self: *@This()) !*Stmt {
_ = try self.consumeSingle(.Loop);
var expr: ?*Expr = null;
@ -837,7 +802,7 @@ pub const Parser = struct {
.Get => |get| {
switch (op.ttype) {
.ColonEqual => {
self.doError("can not initialize struct field", .{});
self.doError("can not initialize struct field");
return Result.CompileError;
},
@ -857,7 +822,7 @@ pub const Parser = struct {
},
else => |expr_typ| {
self.doError("Invalid assignment target {}", .{expr_typ});
self.doError("Invalid assignment target {}", expr_typ);
return Result.CompileError;
},
}
@ -1027,8 +992,8 @@ pub const Parser = struct {
fn finishStructVal(self: *@This(), expr: *Expr) !*Expr {
// <expr>{a: 10 b: 10}
// for this to work properly, <expr> must be Variable, since its a type.
if (@as(ast.ExprType, expr.*) != .Variable) {
self.doError("Expected variable for struct type, got {}", .{@as(ast.ExprType, expr.*)});
if (ast.ExprType(expr.*) != .Variable) {
self.doError("Expected variable for struct type, got {}", ast.ExprType(expr.*));
return Result.CompileError;
}
@ -1093,7 +1058,7 @@ pub const Parser = struct {
},
else => blk: {
self.doError("expected literal, got {}", .{curtype});
self.doError("expected literal, got {}", curtype);
return Result.CompileError;
},
};

19
src/runner.zig
View File

@ -13,31 +13,32 @@ const Parser = parsers.Parser;
pub const Runner = struct {
allocator: *Allocator,
stdout: std.fs.File.OutStream,
stdout: main.StdOut,
pub fn init(allocator: *Allocator, stdout: anytype) Runner {
return .{ .allocator = allocator, .stdout = stdout };
pub fn init(allocator: *Allocator, stdout: main.StdOut) Runner {
return Runner{ .allocator = allocator, .stdout = stdout };
}
fn testScanner(self: *Runner, scanner: *scanners.Scanner) !void {
while (true) {
var tok_opt = scanner.nextToken() catch |err| {
try self.stdout.print("error at '{}': {}\n", .{
try self.stdout.print(
"error at '{}': {}\n",
scanner.currentLexeme(),
err,
});
);
return Result.ScannerError;
};
if (tok_opt) |tok| {
if (tok.ttype == .EOF) break;
try self.stdout.print("{x}\n", .{tok});
try self.stdout.print("{x}\n", tok);
}
}
}
pub fn execute(self: *Runner, code: []const u8) !void {
pub fn execute(self: *Runner, code: []u8) !void {
var scanner = scanners.Scanner.init(self.allocator, code);
try self.testScanner(&scanner);
@ -45,9 +46,9 @@ pub const Runner = struct {
var parser = Parser.init(self.allocator, &scanner);
var root = try parser.parse();
// var it = root.Root.iterator();
var it = root.Root.iterator();
std.debug.warn("parse tree\n", .{});
std.debug.warn("parse tree\n");
printer.printNode(root, 0);
return Result.Ok;

4
src/scanner.zig
View File

@ -97,13 +97,13 @@ fn getKeyword(keyword: []const u8) ?TokenType {
/// Scanner for vlang tokens.
pub const Scanner = struct {
allocator: *Allocator,
source: []const u8,
source: []u8,
start: usize = 0,
current: usize = 0,
line: usize = 1,
pub fn init(allocator: *Allocator, source: []const u8) Scanner {
pub fn init(allocator: *Allocator, source: []u8) Scanner {
return Scanner{ .allocator = allocator, .source = source };
}