self-hosted parsing std progress

[tiehuis]

Here is a summary of the remaining items left to parse std using the self-hosted parser. Using the following command:

zig fmt src/**/*.zig on the current master branch: (note: using compiler driver from here, shouldn't matter)

• std/event.zig

std/event.zig:46:59: error: expected call or fn proto, found InfixOp.
        self.accept_coro = try async<self.loop.allocator> TcpServer.handler(self);
                                                          ~~~~~~~~~
error parsing file 'std/event.zig': error.ParseError

• std/fmt/index.zig

std/fmt/index.zig:449:28: error: expected RBrace or Identifier, found Keyword_error
const ParseUnsignedError = error {
                           ~~~~~
error parsing file 'std/fmt/index.zig': error.ParseError

• std/heap.zig

std/heap.zig:121:65: error: expected primary expression, found Keyword_if
                    const new_addr_end_rounded = new_addr_end + if (rem == 0) 0 else (os.page_size - rem);
                                                                ~~
error parsing file 'std/heap.zig': error.ParseError

• std/io.zig

std/io.zig:284:12: error: expected Semicolon, found Keyword_struct
    return struct {
           ~~~~~~
error parsing file 'std/io.zig': error.ParseError

• std/math/x86_64/sqrt.zig

std/math/x86_64/sqrt.zig:2:12: error: expected Semicolon, found Keyword_asm
    return asm (
           ~~~
error parsing file 'std/math/x86_64/sqrt.zig': error.ParseError

• std/os/child_process.zig

std/os/child_process.zig:19:9: error: expected variable declaration or function, found Identifier
    pub pid: if (is_windows) void else i32,
        ~~~
error parsing file 'std/os/child_process.zig': error.ParseError

• std/os/index.zig

std/os/index.zig:1083:53: error: expected ',' or RBrace, found Equal
            error.AccessDenied => got_access_denied = true,
                                                    ~
error parsing file 'std/os/index.zig': error.ParseError

• std/os/zen.zig

std/os/zen.zig:180:1: error: expected variable declaration or function, found Keyword_inline
inline fn syscall0(number: Syscall) usize {
~~~~~~
error parsing file 'std/os/zen.zig': error.ParseError

• std/special/build_runner.zig

std/special/build_runner.zig:200:77: error: expected RBrace or Comma, found Keyword_error
fn usageAndErr(builder: &Builder, already_ran_build: bool, out_stream: var) error {
                                                                            ~~~~~
error parsing file 'std/special/build_runner.zig': error.ParseError

• std/special/compiler_rt/aulldiv.zig

std/special/compiler_rt/aulldiv.zig:4:9: error: expected StringLiteral, found MultilineStringLiteralLine
        \\.intel_syntax noprefix
        ~~~~~~~~~~~~~~~~~~~~~~~~~
error parsing file 'std/special/compiler_rt/aulldiv.zig': error.ParseError

• std/special/compiler_rt/aullrem.zig

std/special/compiler_rt/aullrem.zig:4:9: error: expected StringLiteral, found MultilineStringLiteralLine
        \\.intel_syntax noprefix
        ~~~~~~~~~~~~~~~~~~~~~~~~~
error parsing file 'std/special/compiler_rt/aullrem.zig': error.ParseError

• std/special/compiler_rt/index.zig

std/special/compiler_rt/index.zig:155:9: error: expected StringLiteral, found MultilineStringLiteralLine
        \\ push    { lr }
        ~~~~~~~~~~~~~~~~~~
error parsing file 'std/special/compiler_rt/index.zig': error.ParseError

• std/zig/parser.zig

std/zig/parser.zig:74:45: error: expected ',' or RBrace, found Equal
                DestPtr.Field => |ptr| *ptr = value,
                                            ~
error parsing file 'std/zig/parser.zig': error.ParseError

• std/zig/tokenizer.zig

std/zig/tokenizer.zig:1163:51: error: expected primary expression, found Keyword_switch
                std.debug.assert(expected_kind == switch (token.id) { Token.Id.StringLiteral => |kind| kind, else => unreachable });
                                                  ~~~~~~
error parsing file 'std/zig/tokenizer.zig': error.ParseError

[Hejsil]

I also think the code for optional expressions in return and friends, should be redone. The current solution produces bad error messages in some cases (see std/io.zig and std/math/x86_64/sqrt.zig). More thoughs here

[Hejsil]

4b0556e also allows parsing of std/io.zig and std/zig/tokenizer.zig

[tiehuis]

Great work, @Hejsil. With that last commit zig fmt successfully parses all of std!

We can defer style changes to #911.