2019-06-05 01:11:11 +00:00
|
|
|
const std = @import("std");
|
|
|
|
const scanners = @import("scanner.zig");
|
|
|
|
const main = @import("main.zig");
|
|
|
|
const ast = @import("ast.zig");
|
|
|
|
const tokens = @import("tokens.zig");
|
2019-06-06 01:06:12 +00:00
|
|
|
const err = @import("errors.zig");
|
2019-06-05 01:11:11 +00:00
|
|
|
|
|
|
|
const Allocator = std.mem.Allocator;
|
|
|
|
const Scanner = scanners.Scanner;
|
|
|
|
const Token = tokens.Token;
|
|
|
|
const TokenType = tokens.TokenType;
|
|
|
|
const Result = main.Result;
|
2019-07-01 18:01:43 +00:00
|
|
|
const Node = ast.Node;
|
2019-06-06 01:06:12 +00:00
|
|
|
|
2019-06-05 01:11:11 +00:00
|
|
|
pub const Parser = struct {
|
|
|
|
allocator: *Allocator,
|
|
|
|
scanner: *Scanner,
|
2019-06-06 01:06:12 +00:00
|
|
|
|
|
|
|
tokens: []Token = undefined,
|
2019-06-05 01:11:11 +00:00
|
|
|
|
2019-08-23 14:57:49 +00:00
|
|
|
hadError: bool = false,
|
|
|
|
|
2019-06-05 01:11:11 +00:00
|
|
|
pub fn init(allocator: *Allocator, scanner: *Scanner) Parser {
|
|
|
|
return Parser{ .allocator = allocator, .scanner = scanner };
|
|
|
|
}
|
|
|
|
|
2019-08-23 14:57:49 +00:00
|
|
|
fn doError(self: *Parser, comptime fmt: []const u8, args: ...) void {
|
|
|
|
self.hadError = true;
|
|
|
|
|
2019-06-05 01:11:11 +00:00
|
|
|
std.debug.warn("parser error at line {}\n\t", self.scanner.line);
|
|
|
|
std.debug.warn(fmt, args);
|
|
|
|
std.debug.warn("\n");
|
|
|
|
}
|
|
|
|
|
2019-06-06 01:06:12 +00:00
|
|
|
fn peek(self: *Parser) Token {
|
2019-07-01 18:39:48 +00:00
|
|
|
return self.tokens[self.tokens.len - 1];
|
2019-06-06 01:06:12 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
fn previous(self: *Parser) Token {
|
2019-07-01 18:39:48 +00:00
|
|
|
return self.tokens[self.tokens.len - 2];
|
2019-06-06 01:06:12 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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);
|
2019-06-05 01:11:11 +00:00
|
|
|
}
|
2019-06-06 01:06:12 +00:00
|
|
|
|
|
|
|
return Result.CompileError;
|
2019-06-05 01:11:11 +00:00
|
|
|
}
|
|
|
|
|
2019-06-06 01:06:12 +00:00
|
|
|
fn isAtEnd(self: *Parser) bool {
|
|
|
|
return self.peek().ttype == .EOF;
|
|
|
|
}
|
|
|
|
|
|
|
|
fn check(self: *Parser, ttype: TokenType) bool {
|
|
|
|
if (self.isAtEnd()) return false;
|
|
|
|
return self.peek().ttype == ttype;
|
|
|
|
}
|
|
|
|
|
2019-07-01 18:39:48 +00:00
|
|
|
fn nextToken(self: *Parser) !Token {
|
|
|
|
var token: Token = undefined;
|
|
|
|
|
|
|
|
while (true) {
|
|
|
|
var next_token_opt = try self.scanner.nextToken();
|
|
|
|
if (next_token_opt) |token_nice| {
|
|
|
|
token = token_nice;
|
|
|
|
break;
|
2019-06-06 01:06:12 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-07-01 18:39:48 +00:00
|
|
|
self.tokens = try self.allocator.realloc(
|
|
|
|
self.tokens,
|
|
|
|
self.tokens.len + 1,
|
|
|
|
);
|
2019-06-06 01:06:12 +00:00
|
|
|
|
2019-07-01 18:39:48 +00:00
|
|
|
self.tokens[self.tokens.len - 1] = token;
|
|
|
|
return token;
|
2019-06-06 01:06:12 +00:00
|
|
|
}
|
|
|
|
|
2019-07-01 18:39:48 +00:00
|
|
|
fn consume(self: *Parser, ttype: TokenType, comptime msg: []const u8) !Token {
|
|
|
|
if (self.check(ttype)) return try self.nextToken();
|
2019-06-06 01:06:12 +00:00
|
|
|
|
|
|
|
try self.tokenError(self.peek(), msg);
|
|
|
|
return Result.CompileError;
|
2019-06-05 01:11:11 +00:00
|
|
|
}
|
|
|
|
|
2019-07-01 18:25:07 +00:00
|
|
|
fn consumeSingle(self: *Parser, ttype: TokenType) !Token {
|
2019-07-01 18:39:48 +00:00
|
|
|
std.debug.warn("consume {}, has {}\n", ttype, self.peek().ttype);
|
|
|
|
|
|
|
|
if (self.check(ttype)) {
|
|
|
|
var cur = self.peek();
|
|
|
|
_ = try self.nextToken();
|
|
|
|
std.debug.warn("now has {}\n", self.peek());
|
|
|
|
return cur;
|
|
|
|
}
|
2019-07-01 18:25:07 +00:00
|
|
|
|
|
|
|
var buf_main: [1000]u8 = undefined;
|
|
|
|
var buf = try std.fmt.bufPrint(
|
|
|
|
buf_main[0..],
|
|
|
|
"expected {}, got {}",
|
|
|
|
ttype,
|
|
|
|
self.peek().ttype,
|
|
|
|
);
|
|
|
|
try self.tokenError(self.peek(), buf);
|
|
|
|
|
|
|
|
return Result.CompileError;
|
|
|
|
}
|
|
|
|
|
2019-07-01 18:55:19 +00:00
|
|
|
fn mkFnDecl(self: *Parser, name: Token, params: ast.ParamList) !*ast.Node {
|
2019-07-01 18:25:07 +00:00
|
|
|
var node = try self.allocator.create(Node);
|
2019-07-01 18:55:19 +00:00
|
|
|
node.* = Node{
|
|
|
|
.FnDecl = ast.FnDecl{
|
|
|
|
.func_name = name,
|
|
|
|
.params = params,
|
|
|
|
|
|
|
|
// TODO replace by arg when statements work
|
|
|
|
.body = ast.NodeList.init(self.allocator),
|
|
|
|
},
|
|
|
|
};
|
2019-07-01 18:01:43 +00:00
|
|
|
return node;
|
2019-06-06 01:06:12 +00:00
|
|
|
}
|
|
|
|
|
2019-07-01 18:01:43 +00:00
|
|
|
fn functionDecl(self: *Parser) !*ast.Node {
|
2019-07-01 18:39:48 +00:00
|
|
|
_ = try self.consumeSingle(.Fn);
|
|
|
|
var name = try self.consumeSingle(.Identifier);
|
2019-07-01 18:25:07 +00:00
|
|
|
_ = try self.consumeSingle(.LeftParen);
|
2019-07-01 18:39:48 +00:00
|
|
|
|
2019-07-01 18:55:19 +00:00
|
|
|
var param_list = ast.ParamList.init(self.allocator);
|
|
|
|
|
|
|
|
while (true) {
|
|
|
|
var tok = self.peek();
|
|
|
|
|
2019-07-01 20:45:13 +00:00
|
|
|
switch (tok.ttype) {
|
|
|
|
.RightParen => break,
|
|
|
|
.Identifier => {},
|
|
|
|
else => try self.doError("expected identifier, got {}", tok.ttype),
|
2019-07-01 18:55:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
var typetok = try self.nextToken();
|
|
|
|
if (typetok.ttype != .Identifier) {
|
|
|
|
try self.doError("expected identifier for type, got {}", typetok.ttype);
|
|
|
|
}
|
|
|
|
|
|
|
|
var param = try self.allocator.create(ast.ParamDecl);
|
|
|
|
param.* = ast.ParamDecl{ .param_name = tok, .param_type = typetok };
|
|
|
|
|
|
|
|
std.debug.warn("param! {}\n", param);
|
|
|
|
try param_list.append(param);
|
2019-07-01 20:45:13 +00:00
|
|
|
tok = try self.nextToken();
|
2019-07-01 18:55:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// function body
|
2019-07-01 20:45:13 +00:00
|
|
|
_ = try self.nextToken();
|
2019-07-01 18:55:19 +00:00
|
|
|
_ = try self.consumeSingle(.LeftBrace);
|
2019-08-23 14:57:49 +00:00
|
|
|
var body = ast.NodeList.init(self.allocator);
|
|
|
|
|
2019-07-01 18:55:19 +00:00
|
|
|
while (true) {
|
|
|
|
var tok = self.peek();
|
|
|
|
if (tok.ttype == .RightBrace) break;
|
2019-08-23 14:57:49 +00:00
|
|
|
|
|
|
|
// TODO statements
|
|
|
|
//var node = try self.processToken(tok);
|
|
|
|
//std.debug.warn("stmt:{}\n", node);
|
|
|
|
//try body.append(node);
|
|
|
|
|
|
|
|
tok = try self.nextToken();
|
2019-07-01 18:55:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
_ = try self.consumeSingle(.RightBrace);
|
|
|
|
|
|
|
|
return try self.mkFnDecl(name, param_list);
|
2019-06-06 01:06:12 +00:00
|
|
|
}
|
|
|
|
|
2019-08-23 14:57:49 +00:00
|
|
|
fn functionCall(self: *Parser) !*ast.Node {
|
|
|
|
var identifier = try self.consumeSingle(.Identifier);
|
|
|
|
_ = try self.consumeSingle(.LeftParen);
|
|
|
|
|
|
|
|
// arguments
|
|
|
|
var args = ast.NodeList.init(self.allocator);
|
|
|
|
|
|
|
|
while (true) {
|
|
|
|
var tok = self.peek();
|
|
|
|
|
|
|
|
switch (tok.ttype) {
|
|
|
|
.RightParen => break,
|
|
|
|
.String => blk: {
|
|
|
|
var node = try self.allocator.create(Node);
|
|
|
|
node.* = Node{ .String = tok };
|
|
|
|
try args.append(node);
|
|
|
|
},
|
|
|
|
else => {},
|
|
|
|
}
|
|
|
|
|
|
|
|
tok = try self.nextToken();
|
|
|
|
}
|
|
|
|
|
|
|
|
_ = try self.consumeSingle(.RightParen);
|
|
|
|
|
|
|
|
return Node{ .FnCall = ast.FnCall{ .func_name = identifier, .arguments = args } };
|
|
|
|
}
|
|
|
|
|
|
|
|
fn processToken(self: *Parser, token: Token) anyerror!*ast.Node {
|
2019-07-01 18:25:07 +00:00
|
|
|
var node = switch (token.ttype) {
|
|
|
|
.Fn => try self.functionDecl(),
|
2019-08-23 14:57:49 +00:00
|
|
|
.Identifier => try self.functionCall(),
|
2019-07-01 18:01:43 +00:00
|
|
|
else => blk: {
|
|
|
|
try self.doError("TODO handle {}\n", token.ttype);
|
|
|
|
return Result.CompileError;
|
|
|
|
},
|
2019-07-01 18:25:07 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
return node;
|
2019-06-06 01:06:12 +00:00
|
|
|
}
|
|
|
|
|
2019-08-23 14:57:49 +00:00
|
|
|
fn block(self: *Parser) anyerror!*ast.Node {
|
|
|
|
|
|
|
|
// TODO if(self.accept(.Const))
|
|
|
|
|
|
|
|
// while receiving functions, process more
|
|
|
|
while (self.accept(.Fn)) {
|
|
|
|
try self.consumeSingle(.LeftParen);
|
|
|
|
try self.consumeSingle(.RightParen);
|
|
|
|
var block = try self.block();
|
|
|
|
}
|
|
|
|
|
|
|
|
self.statement();
|
|
|
|
}
|
|
|
|
|
|
|
|
fn topDecl(self: *@This()) !?*Node {
|
|
|
|
return switch (self.peek().ttype) {
|
|
|
|
.Fn => blk: {
|
|
|
|
_ = try self.consumeSingle(.Fn);
|
|
|
|
var name = try self.consumeSingle(.Identifier);
|
2019-08-23 18:42:50 +00:00
|
|
|
_ = try self.consumeSingle(.LeftParen);
|
|
|
|
// TODO paramlist
|
|
|
|
_ = try self.consumeSingle(.RightParen);
|
|
|
|
_ = try self.consumeSingle(.LeftBrace);
|
|
|
|
// TODO block
|
|
|
|
_ = try self.consumeSingle(.RightBrace);
|
2019-08-23 14:57:49 +00:00
|
|
|
std.debug.warn("!fn name: {}\n", name);
|
|
|
|
break :blk try self.mkFnDecl(
|
|
|
|
name,
|
|
|
|
ast.ParamList.init(self.allocator),
|
|
|
|
);
|
|
|
|
},
|
|
|
|
else => |ttype| blk: {
|
|
|
|
self.doError("expected fn, got {}\n", ttype);
|
|
|
|
break :blk null;
|
|
|
|
},
|
|
|
|
};
|
|
|
|
}
|
|
|
|
|
2019-07-01 18:01:43 +00:00
|
|
|
pub fn parse(self: *Parser) !*ast.Node {
|
2019-06-06 01:06:12 +00:00
|
|
|
self.tokens = try self.allocator.alloc(Token, 0);
|
2019-07-01 18:01:43 +00:00
|
|
|
var root = try ast.mkRoot(self.allocator);
|
2019-06-06 01:06:12 +00:00
|
|
|
|
|
|
|
while (true) {
|
2019-07-01 18:39:48 +00:00
|
|
|
var token = try self.nextToken();
|
|
|
|
if (token.ttype == .EOF) break;
|
2019-07-01 18:01:43 +00:00
|
|
|
|
2019-08-23 14:57:49 +00:00
|
|
|
var node = try self.topDecl();
|
|
|
|
if (node == null) continue;
|
|
|
|
try root.Root.append(node.?);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (self.hadError) {
|
|
|
|
return error.ParseError;
|
2019-06-06 01:06:12 +00:00
|
|
|
}
|
|
|
|
|
2019-07-01 18:01:43 +00:00
|
|
|
return root;
|
2019-06-05 01:11:11 +00:00
|
|
|
}
|
|
|
|
};
|