mirror of
https://github.com/ziglang/zig.git
synced 2024-12-03 18:38:45 +00:00
1732 lines
59 KiB
Zig
1732 lines
59 KiB
Zig
const std = @import("std.zig");
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const math = std.math;
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const assert = std.debug.assert;
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const mem = std.mem;
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const builtin = @import("builtin");
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const errol = @import("fmt/errol.zig");
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const lossyCast = std.math.lossyCast;
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pub const default_max_depth = 3;
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pub const Alignment = enum {
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Left,
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Center,
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Right,
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};
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pub const FormatOptions = struct {
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precision: ?usize = null,
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width: ?usize = null,
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alignment: ?Alignment = null,
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fill: u8 = ' ',
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};
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fn peekIsAlign(comptime fmt: []const u8) bool {
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// Should only be called during a state transition to the format segment.
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comptime assert(fmt[0] == ':');
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inline for (([_]u8{ 1, 2 })[0..]) |i| {
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if (fmt.len > i and (fmt[i] == '<' or fmt[i] == '^' or fmt[i] == '>')) {
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return true;
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}
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}
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return false;
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}
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/// Renders fmt string with args, calling output with slices of bytes.
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/// If `output` returns an error, the error is returned from `format` and
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/// `output` is not called again.
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///
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/// The format string must be comptime known and may contain placeholders following
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/// this format:
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/// `{[position][specifier]:[fill][alignment][width].[precision]}`
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///
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/// Each word between `[` and `]` is a parameter you have to replace with something:
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///
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/// - *position* is the index of the argument that should be inserted
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/// - *specifier* is a type-dependent formatting option that determines how a type should formatted (see below)
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/// - *fill* is a single character which is used to pad the formatted text
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/// - *alignment* is one of the three characters `<`, `^` or `>`. they define if the text is *left*, *center*, or *right* aligned
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/// - *width* is the total width of the field in characters
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/// - *precision* specifies how many decimals a formatted number should have
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///
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/// Note that most of the parameters are optional and may be omitted. Also you can leave out separators like `:` and `.` when
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/// all parameters after the separator are omitted.
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/// Only exception is the *fill* parameter. If *fill* is required, one has to specify *alignment* as well, as otherwise
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/// the digits after `:` is interpreted as *width*, not *fill*.
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///
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/// The *specifier* has several options for types:
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/// - `x` and `X`:
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/// - format the non-numeric value as a string of bytes in hexadecimal notation ("binary dump") in either lower case or upper case
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/// - output numeric value in hexadecimal notation
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/// - `s`: print a pointer-to-many as a c-string, use zero-termination
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/// - `B` and `Bi`: output a memory size in either metric (1000) or power-of-two (1024) based notation. works for both float and integer values.
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/// - `e`: output floating point value in scientific notation
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/// - `d`: output numeric value in decimal notation
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/// - `b`: output integer value in binary notation
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/// - `c`: output integer as an ASCII character. Integer type must have 8 bits at max.
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/// - `*`: output the address of the value instead of the value itself.
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///
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/// If a formatted user type contains a function of the type
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/// ```
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/// pub fn format(value: ?, comptime fmt: []const u8, options: std.fmt.FormatOptions, out_stream: var) !void
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/// ```
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/// with `?` being the type formatted, this function will be called instead of the default implementation.
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/// This allows user types to be formatted in a logical manner instead of dumping all fields of the type.
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///
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/// A user type may be a `struct`, `vector`, `union` or `enum` type.
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pub fn format(
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out_stream: var,
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comptime fmt: []const u8,
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args: var,
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) !void {
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const ArgSetType = u32;
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if (@typeInfo(@TypeOf(args)) != .Struct) {
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@compileError("Expected tuple or struct argument, found " ++ @typeName(@TypeOf(args)));
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}
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if (args.len > ArgSetType.bit_count) {
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@compileError("32 arguments max are supported per format call");
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}
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const State = enum {
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Start,
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Positional,
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CloseBrace,
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Specifier,
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FormatFillAndAlign,
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FormatWidth,
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FormatPrecision,
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};
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comptime var start_index = 0;
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comptime var state = State.Start;
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comptime var maybe_pos_arg: ?comptime_int = null;
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comptime var specifier_start = 0;
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comptime var specifier_end = 0;
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comptime var options = FormatOptions{};
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comptime var arg_state: struct {
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next_arg: usize = 0,
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used_args: ArgSetType = 0,
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args_len: usize = args.len,
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fn hasUnusedArgs(comptime self: *@This()) bool {
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return (@popCount(ArgSetType, self.used_args) != self.args_len);
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}
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fn nextArg(comptime self: *@This(), comptime pos_arg: ?comptime_int) comptime_int {
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const next_idx = pos_arg orelse blk: {
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const arg = self.next_arg;
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self.next_arg += 1;
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break :blk arg;
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};
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if (next_idx >= self.args_len) {
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@compileError("Too few arguments");
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}
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// Mark this argument as used
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self.used_args |= 1 << next_idx;
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return next_idx;
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}
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} = .{};
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inline for (fmt) |c, i| {
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switch (state) {
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.Start => switch (c) {
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'{' => {
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if (start_index < i) {
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try out_stream.writeAll(fmt[start_index..i]);
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}
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start_index = i;
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specifier_start = i + 1;
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specifier_end = i + 1;
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maybe_pos_arg = null;
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state = .Positional;
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options = FormatOptions{};
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},
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'}' => {
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if (start_index < i) {
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try out_stream.writeAll(fmt[start_index..i]);
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}
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state = .CloseBrace;
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},
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else => {},
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},
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.Positional => switch (c) {
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'{' => {
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state = .Start;
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start_index = i;
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},
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':' => {
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state = if (comptime peekIsAlign(fmt[i..])) State.FormatFillAndAlign else State.FormatWidth;
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specifier_end = i;
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},
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'0'...'9' => {
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if (maybe_pos_arg == null) {
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maybe_pos_arg = 0;
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}
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maybe_pos_arg.? *= 10;
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maybe_pos_arg.? += c - '0';
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specifier_start = i + 1;
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if (maybe_pos_arg.? >= args.len) {
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@compileError("Positional value refers to non-existent argument");
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}
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},
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'}' => {
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const arg_to_print = comptime arg_state.nextArg(maybe_pos_arg);
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try formatType(
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args[arg_to_print],
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fmt[0..0],
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options,
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out_stream,
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default_max_depth,
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);
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state = .Start;
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start_index = i + 1;
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},
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else => {
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state = .Specifier;
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specifier_start = i;
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},
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},
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.CloseBrace => switch (c) {
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'}' => {
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state = .Start;
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start_index = i;
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},
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else => @compileError("Single '}' encountered in format string"),
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},
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.Specifier => switch (c) {
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':' => {
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specifier_end = i;
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state = if (comptime peekIsAlign(fmt[i..])) State.FormatFillAndAlign else State.FormatWidth;
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},
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'}' => {
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const arg_to_print = comptime arg_state.nextArg(maybe_pos_arg);
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try formatType(
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args[arg_to_print],
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fmt[specifier_start..i],
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options,
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out_stream,
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default_max_depth,
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);
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state = .Start;
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start_index = i + 1;
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},
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else => {},
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},
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// Only entered if the format string contains a fill/align segment.
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.FormatFillAndAlign => switch (c) {
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'<' => {
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options.alignment = Alignment.Left;
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state = .FormatWidth;
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},
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'^' => {
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options.alignment = Alignment.Center;
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state = .FormatWidth;
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},
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'>' => {
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options.alignment = Alignment.Right;
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state = .FormatWidth;
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},
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else => {
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options.fill = c;
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},
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},
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.FormatWidth => switch (c) {
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'0'...'9' => {
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if (options.width == null) {
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options.width = 0;
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}
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options.width.? *= 10;
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options.width.? += c - '0';
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},
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'.' => {
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state = .FormatPrecision;
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},
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'}' => {
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const arg_to_print = comptime arg_state.nextArg(maybe_pos_arg);
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try formatType(
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args[arg_to_print],
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fmt[specifier_start..specifier_end],
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options,
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out_stream,
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default_max_depth,
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);
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state = .Start;
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start_index = i + 1;
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},
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else => {
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@compileError("Unexpected character in width value: " ++ [_]u8{c});
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},
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},
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.FormatPrecision => switch (c) {
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'0'...'9' => {
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if (options.precision == null) {
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options.precision = 0;
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}
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options.precision.? *= 10;
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options.precision.? += c - '0';
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},
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'}' => {
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const arg_to_print = comptime arg_state.nextArg(maybe_pos_arg);
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try formatType(
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args[arg_to_print],
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fmt[specifier_start..specifier_end],
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options,
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out_stream,
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default_max_depth,
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);
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state = .Start;
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start_index = i + 1;
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},
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else => {
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@compileError("Unexpected character in precision value: " ++ [_]u8{c});
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},
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},
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}
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}
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comptime {
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if (comptime arg_state.hasUnusedArgs()) {
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@compileError("Unused arguments");
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}
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if (state != State.Start) {
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@compileError("Incomplete format string: " ++ fmt);
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}
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}
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if (start_index < fmt.len) {
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try out_stream.writeAll(fmt[start_index..]);
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}
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}
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pub fn formatType(
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value: var,
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comptime fmt: []const u8,
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options: FormatOptions,
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out_stream: var,
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max_depth: usize,
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) @TypeOf(out_stream).Error!void {
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if (comptime std.mem.eql(u8, fmt, "*")) {
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try out_stream.writeAll(@typeName(@TypeOf(value).Child));
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try out_stream.writeAll("@");
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try formatInt(@ptrToInt(value), 16, false, FormatOptions{}, out_stream);
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return;
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}
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const T = @TypeOf(value);
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if (comptime std.meta.trait.hasFn("format")(T)) {
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return try value.format(fmt, options, out_stream);
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}
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switch (@typeInfo(T)) {
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.ComptimeInt, .Int, .ComptimeFloat, .Float => {
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return formatValue(value, fmt, options, out_stream);
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},
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.Void => {
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return formatBuf("void", options, out_stream);
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},
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.Bool => {
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return formatBuf(if (value) "true" else "false", options, out_stream);
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},
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.Optional => {
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if (value) |payload| {
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return formatType(payload, fmt, options, out_stream, max_depth);
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} else {
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return formatBuf("null", options, out_stream);
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}
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},
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.ErrorUnion => {
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if (value) |payload| {
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return formatType(payload, fmt, options, out_stream, max_depth);
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} else |err| {
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return formatType(err, fmt, options, out_stream, max_depth);
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}
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},
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.ErrorSet => {
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try out_stream.writeAll("error.");
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return out_stream.writeAll(@errorName(value));
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},
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.Enum => |enumInfo| {
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try out_stream.writeAll(@typeName(T));
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if (enumInfo.is_exhaustive) {
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try out_stream.writeAll(".");
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try out_stream.writeAll(@tagName(value));
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} else {
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// TODO: when @tagName works on exhaustive enums print known enum strings
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try out_stream.writeAll("(");
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try formatType(@enumToInt(value), fmt, options, out_stream, max_depth);
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try out_stream.writeAll(")");
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}
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},
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.Union => {
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try out_stream.writeAll(@typeName(T));
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if (max_depth == 0) {
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return out_stream.writeAll("{ ... }");
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}
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const info = @typeInfo(T).Union;
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if (info.tag_type) |UnionTagType| {
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try out_stream.writeAll("{ .");
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try out_stream.writeAll(@tagName(@as(UnionTagType, value)));
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try out_stream.writeAll(" = ");
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inline for (info.fields) |u_field| {
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if (@enumToInt(@as(UnionTagType, value)) == u_field.enum_field.?.value) {
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try formatType(@field(value, u_field.name), fmt, options, out_stream, max_depth - 1);
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}
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}
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try out_stream.writeAll(" }");
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} else {
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try format(out_stream, "@{x}", .{@ptrToInt(&value)});
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}
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},
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.Struct => |StructT| {
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try out_stream.writeAll(@typeName(T));
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if (max_depth == 0) {
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return out_stream.writeAll("{ ... }");
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}
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try out_stream.writeAll("{");
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inline for (StructT.fields) |f, i| {
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if (i == 0) {
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try out_stream.writeAll(" .");
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} else {
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try out_stream.writeAll(", .");
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}
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try out_stream.writeAll(f.name);
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try out_stream.writeAll(" = ");
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try formatType(@field(value, f.name), fmt, options, out_stream, max_depth - 1);
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}
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try out_stream.writeAll(" }");
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},
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.Pointer => |ptr_info| switch (ptr_info.size) {
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.One => switch (@typeInfo(ptr_info.child)) {
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.Array => |info| {
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if (info.child == u8) {
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return formatText(value, fmt, options, out_stream);
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}
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return format(out_stream, "{}@{x}", .{ @typeName(T.Child), @ptrToInt(value) });
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},
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.Enum, .Union, .Struct => {
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return formatType(value.*, fmt, options, out_stream, max_depth);
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},
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else => return format(out_stream, "{}@{x}", .{ @typeName(T.Child), @ptrToInt(value) }),
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},
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|
.Many, .C => {
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if (ptr_info.sentinel) |sentinel| {
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|
return formatType(mem.span(value), fmt, options, out_stream, max_depth);
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|
}
|
|
if (ptr_info.child == u8) {
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|
if (fmt.len > 0 and fmt[0] == 's') {
|
|
return formatText(mem.span(value), fmt, options, out_stream);
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}
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|
}
|
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return format(out_stream, "{}@{x}", .{ @typeName(T.Child), @ptrToInt(value) });
|
|
},
|
|
.Slice => {
|
|
if (fmt.len > 0 and ((fmt[0] == 'x') or (fmt[0] == 'X'))) {
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|
return formatText(value, fmt, options, out_stream);
|
|
}
|
|
if (ptr_info.child == u8) {
|
|
return formatText(value, fmt, options, out_stream);
|
|
}
|
|
return format(out_stream, "{}@{x}", .{ @typeName(ptr_info.child), @ptrToInt(value.ptr) });
|
|
},
|
|
},
|
|
.Array => |info| {
|
|
const Slice = @Type(builtin.TypeInfo{
|
|
.Pointer = .{
|
|
.size = .Slice,
|
|
.is_const = true,
|
|
.is_volatile = false,
|
|
.is_allowzero = false,
|
|
.alignment = @alignOf(info.child),
|
|
.child = info.child,
|
|
.sentinel = null,
|
|
},
|
|
});
|
|
return formatType(@as(Slice, &value), fmt, options, out_stream, max_depth);
|
|
},
|
|
.Vector => {
|
|
const len = @typeInfo(T).Vector.len;
|
|
try out_stream.writeAll("{ ");
|
|
var i: usize = 0;
|
|
while (i < len) : (i += 1) {
|
|
try formatValue(value[i], fmt, options, out_stream);
|
|
if (i < len - 1) {
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|
try out_stream.writeAll(", ");
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|
}
|
|
}
|
|
try out_stream.writeAll(" }");
|
|
},
|
|
.Fn => {
|
|
return format(out_stream, "{}@{x}", .{ @typeName(T), @ptrToInt(value) });
|
|
},
|
|
.Type => return out_stream.writeAll(@typeName(T)),
|
|
.EnumLiteral => {
|
|
const buffer = [_]u8{'.'} ++ @tagName(value);
|
|
return formatType(buffer, fmt, options, out_stream, max_depth);
|
|
},
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|
else => @compileError("Unable to format type '" ++ @typeName(T) ++ "'"),
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|
}
|
|
}
|
|
|
|
fn formatValue(
|
|
value: var,
|
|
comptime fmt: []const u8,
|
|
options: FormatOptions,
|
|
out_stream: var,
|
|
) !void {
|
|
if (comptime std.mem.eql(u8, fmt, "B")) {
|
|
return formatBytes(value, options, 1000, out_stream);
|
|
} else if (comptime std.mem.eql(u8, fmt, "Bi")) {
|
|
return formatBytes(value, options, 1024, out_stream);
|
|
}
|
|
|
|
const T = @TypeOf(value);
|
|
switch (@typeInfo(T)) {
|
|
.Float, .ComptimeFloat => return formatFloatValue(value, fmt, options, out_stream),
|
|
.Int, .ComptimeInt => return formatIntValue(value, fmt, options, out_stream),
|
|
.Bool => return formatBuf(if (value) "true" else "false", options, out_stream),
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|
else => comptime unreachable,
|
|
}
|
|
}
|
|
|
|
pub fn formatIntValue(
|
|
value: var,
|
|
comptime fmt: []const u8,
|
|
options: FormatOptions,
|
|
out_stream: var,
|
|
) !void {
|
|
comptime var radix = 10;
|
|
comptime var uppercase = false;
|
|
|
|
const int_value = if (@TypeOf(value) == comptime_int) blk: {
|
|
const Int = math.IntFittingRange(value, value);
|
|
break :blk @as(Int, value);
|
|
} else
|
|
value;
|
|
|
|
if (fmt.len == 0 or comptime std.mem.eql(u8, fmt, "d")) {
|
|
radix = 10;
|
|
uppercase = false;
|
|
} else if (comptime std.mem.eql(u8, fmt, "c")) {
|
|
if (@TypeOf(int_value).bit_count <= 8) {
|
|
return formatAsciiChar(@as(u8, int_value), options, out_stream);
|
|
} else {
|
|
@compileError("Cannot print integer that is larger than 8 bits as a ascii");
|
|
}
|
|
} else if (comptime std.mem.eql(u8, fmt, "b")) {
|
|
radix = 2;
|
|
uppercase = false;
|
|
} else if (comptime std.mem.eql(u8, fmt, "x")) {
|
|
radix = 16;
|
|
uppercase = false;
|
|
} else if (comptime std.mem.eql(u8, fmt, "X")) {
|
|
radix = 16;
|
|
uppercase = true;
|
|
} else {
|
|
@compileError("Unknown format string: '" ++ fmt ++ "'");
|
|
}
|
|
|
|
return formatInt(int_value, radix, uppercase, options, out_stream);
|
|
}
|
|
|
|
fn formatFloatValue(
|
|
value: var,
|
|
comptime fmt: []const u8,
|
|
options: FormatOptions,
|
|
out_stream: var,
|
|
) !void {
|
|
if (fmt.len == 0 or comptime std.mem.eql(u8, fmt, "e")) {
|
|
return formatFloatScientific(value, options, out_stream);
|
|
} else if (comptime std.mem.eql(u8, fmt, "d")) {
|
|
return formatFloatDecimal(value, options, out_stream);
|
|
} else {
|
|
@compileError("Unknown format string: '" ++ fmt ++ "'");
|
|
}
|
|
}
|
|
|
|
pub fn formatText(
|
|
bytes: []const u8,
|
|
comptime fmt: []const u8,
|
|
options: FormatOptions,
|
|
out_stream: var,
|
|
) !void {
|
|
if (comptime std.mem.eql(u8, fmt, "s") or (fmt.len == 0)) {
|
|
return formatBuf(bytes, options, out_stream);
|
|
} else if (comptime (std.mem.eql(u8, fmt, "x") or std.mem.eql(u8, fmt, "X"))) {
|
|
for (bytes) |c| {
|
|
try formatInt(c, 16, fmt[0] == 'X', FormatOptions{ .width = 2, .fill = '0' }, out_stream);
|
|
}
|
|
return;
|
|
} else {
|
|
@compileError("Unknown format string: '" ++ fmt ++ "'");
|
|
}
|
|
}
|
|
|
|
pub fn formatAsciiChar(
|
|
c: u8,
|
|
options: FormatOptions,
|
|
out_stream: var,
|
|
) !void {
|
|
return out_stream.writeAll(@as(*const [1]u8, &c));
|
|
}
|
|
|
|
pub fn formatBuf(
|
|
buf: []const u8,
|
|
options: FormatOptions,
|
|
out_stream: var,
|
|
) !void {
|
|
const width = options.width orelse buf.len;
|
|
const alignment = options.alignment orelse .Left;
|
|
var padding = if (width > buf.len) (width - buf.len) else 0;
|
|
const pad_byte = [1]u8{options.fill};
|
|
switch (alignment) {
|
|
.Left => {
|
|
try out_stream.writeAll(buf);
|
|
while (padding > 0) : (padding -= 1) {
|
|
try out_stream.writeAll(&pad_byte);
|
|
}
|
|
},
|
|
.Center => {
|
|
const padl = padding / 2;
|
|
var i: usize = 0;
|
|
while (i < padl) : (i += 1) try out_stream.writeAll(&pad_byte);
|
|
try out_stream.writeAll(buf);
|
|
while (i < padding) : (i += 1) try out_stream.writeAll(&pad_byte);
|
|
},
|
|
.Right => {
|
|
while (padding > 0) : (padding -= 1) {
|
|
try out_stream.writeAll(&pad_byte);
|
|
}
|
|
try out_stream.writeAll(buf);
|
|
},
|
|
}
|
|
}
|
|
|
|
// Print a float in scientific notation to the specified precision. Null uses full precision.
|
|
// It should be the case that every full precision, printed value can be re-parsed back to the
|
|
// same type unambiguously.
|
|
pub fn formatFloatScientific(
|
|
value: var,
|
|
options: FormatOptions,
|
|
out_stream: var,
|
|
) !void {
|
|
var x = @floatCast(f64, value);
|
|
|
|
// Errol doesn't handle these special cases.
|
|
if (math.signbit(x)) {
|
|
try out_stream.writeAll("-");
|
|
x = -x;
|
|
}
|
|
|
|
if (math.isNan(x)) {
|
|
return out_stream.writeAll("nan");
|
|
}
|
|
if (math.isPositiveInf(x)) {
|
|
return out_stream.writeAll("inf");
|
|
}
|
|
if (x == 0.0) {
|
|
try out_stream.writeAll("0");
|
|
|
|
if (options.precision) |precision| {
|
|
if (precision != 0) {
|
|
try out_stream.writeAll(".");
|
|
var i: usize = 0;
|
|
while (i < precision) : (i += 1) {
|
|
try out_stream.writeAll("0");
|
|
}
|
|
}
|
|
} else {
|
|
try out_stream.writeAll(".0");
|
|
}
|
|
|
|
try out_stream.writeAll("e+00");
|
|
return;
|
|
}
|
|
|
|
var buffer: [32]u8 = undefined;
|
|
var float_decimal = errol.errol3(x, buffer[0..]);
|
|
|
|
if (options.precision) |precision| {
|
|
errol.roundToPrecision(&float_decimal, precision, errol.RoundMode.Scientific);
|
|
|
|
try out_stream.writeAll(float_decimal.digits[0..1]);
|
|
|
|
// {e0} case prints no `.`
|
|
if (precision != 0) {
|
|
try out_stream.writeAll(".");
|
|
|
|
var printed: usize = 0;
|
|
if (float_decimal.digits.len > 1) {
|
|
const num_digits = math.min(float_decimal.digits.len, precision + 1);
|
|
try out_stream.writeAll(float_decimal.digits[1..num_digits]);
|
|
printed += num_digits - 1;
|
|
}
|
|
|
|
while (printed < precision) : (printed += 1) {
|
|
try out_stream.writeAll("0");
|
|
}
|
|
}
|
|
} else {
|
|
try out_stream.writeAll(float_decimal.digits[0..1]);
|
|
try out_stream.writeAll(".");
|
|
if (float_decimal.digits.len > 1) {
|
|
const num_digits = if (@TypeOf(value) == f32) math.min(@as(usize, 9), float_decimal.digits.len) else float_decimal.digits.len;
|
|
|
|
try out_stream.writeAll(float_decimal.digits[1..num_digits]);
|
|
} else {
|
|
try out_stream.writeAll("0");
|
|
}
|
|
}
|
|
|
|
try out_stream.writeAll("e");
|
|
const exp = float_decimal.exp - 1;
|
|
|
|
if (exp >= 0) {
|
|
try out_stream.writeAll("+");
|
|
if (exp > -10 and exp < 10) {
|
|
try out_stream.writeAll("0");
|
|
}
|
|
try formatInt(exp, 10, false, FormatOptions{ .width = 0 }, out_stream);
|
|
} else {
|
|
try out_stream.writeAll("-");
|
|
if (exp > -10 and exp < 10) {
|
|
try out_stream.writeAll("0");
|
|
}
|
|
try formatInt(-exp, 10, false, FormatOptions{ .width = 0 }, out_stream);
|
|
}
|
|
}
|
|
|
|
// Print a float of the format x.yyyyy where the number of y is specified by the precision argument.
|
|
// By default floats are printed at full precision (no rounding).
|
|
pub fn formatFloatDecimal(
|
|
value: var,
|
|
options: FormatOptions,
|
|
out_stream: var,
|
|
) !void {
|
|
var x = @as(f64, value);
|
|
|
|
// Errol doesn't handle these special cases.
|
|
if (math.signbit(x)) {
|
|
try out_stream.writeAll("-");
|
|
x = -x;
|
|
}
|
|
|
|
if (math.isNan(x)) {
|
|
return out_stream.writeAll("nan");
|
|
}
|
|
if (math.isPositiveInf(x)) {
|
|
return out_stream.writeAll("inf");
|
|
}
|
|
if (x == 0.0) {
|
|
try out_stream.writeAll("0");
|
|
|
|
if (options.precision) |precision| {
|
|
if (precision != 0) {
|
|
try out_stream.writeAll(".");
|
|
var i: usize = 0;
|
|
while (i < precision) : (i += 1) {
|
|
try out_stream.writeAll("0");
|
|
}
|
|
} else {
|
|
try out_stream.writeAll(".0");
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
// non-special case, use errol3
|
|
var buffer: [32]u8 = undefined;
|
|
var float_decimal = errol.errol3(x, buffer[0..]);
|
|
|
|
if (options.precision) |precision| {
|
|
errol.roundToPrecision(&float_decimal, precision, errol.RoundMode.Decimal);
|
|
|
|
// exp < 0 means the leading is always 0 as errol result is normalized.
|
|
var num_digits_whole = if (float_decimal.exp > 0) @intCast(usize, float_decimal.exp) else 0;
|
|
|
|
// the actual slice into the buffer, we may need to zero-pad between num_digits_whole and this.
|
|
var num_digits_whole_no_pad = math.min(num_digits_whole, float_decimal.digits.len);
|
|
|
|
if (num_digits_whole > 0) {
|
|
// We may have to zero pad, for instance 1e4 requires zero padding.
|
|
try out_stream.writeAll(float_decimal.digits[0..num_digits_whole_no_pad]);
|
|
|
|
var i = num_digits_whole_no_pad;
|
|
while (i < num_digits_whole) : (i += 1) {
|
|
try out_stream.writeAll("0");
|
|
}
|
|
} else {
|
|
try out_stream.writeAll("0");
|
|
}
|
|
|
|
// {.0} special case doesn't want a trailing '.'
|
|
if (precision == 0) {
|
|
return;
|
|
}
|
|
|
|
try out_stream.writeAll(".");
|
|
|
|
// Keep track of fractional count printed for case where we pre-pad then post-pad with 0's.
|
|
var printed: usize = 0;
|
|
|
|
// Zero-fill until we reach significant digits or run out of precision.
|
|
if (float_decimal.exp <= 0) {
|
|
const zero_digit_count = @intCast(usize, -float_decimal.exp);
|
|
const zeros_to_print = math.min(zero_digit_count, precision);
|
|
|
|
var i: usize = 0;
|
|
while (i < zeros_to_print) : (i += 1) {
|
|
try out_stream.writeAll("0");
|
|
printed += 1;
|
|
}
|
|
|
|
if (printed >= precision) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Remaining fractional portion, zero-padding if insufficient.
|
|
assert(precision >= printed);
|
|
if (num_digits_whole_no_pad + precision - printed < float_decimal.digits.len) {
|
|
try out_stream.writeAll(float_decimal.digits[num_digits_whole_no_pad .. num_digits_whole_no_pad + precision - printed]);
|
|
return;
|
|
} else {
|
|
try out_stream.writeAll(float_decimal.digits[num_digits_whole_no_pad..]);
|
|
printed += float_decimal.digits.len - num_digits_whole_no_pad;
|
|
|
|
while (printed < precision) : (printed += 1) {
|
|
try out_stream.writeAll("0");
|
|
}
|
|
}
|
|
} else {
|
|
// exp < 0 means the leading is always 0 as errol result is normalized.
|
|
var num_digits_whole = if (float_decimal.exp > 0) @intCast(usize, float_decimal.exp) else 0;
|
|
|
|
// the actual slice into the buffer, we may need to zero-pad between num_digits_whole and this.
|
|
var num_digits_whole_no_pad = math.min(num_digits_whole, float_decimal.digits.len);
|
|
|
|
if (num_digits_whole > 0) {
|
|
// We may have to zero pad, for instance 1e4 requires zero padding.
|
|
try out_stream.writeAll(float_decimal.digits[0..num_digits_whole_no_pad]);
|
|
|
|
var i = num_digits_whole_no_pad;
|
|
while (i < num_digits_whole) : (i += 1) {
|
|
try out_stream.writeAll("0");
|
|
}
|
|
} else {
|
|
try out_stream.writeAll("0");
|
|
}
|
|
|
|
// Omit `.` if no fractional portion
|
|
if (float_decimal.exp >= 0 and num_digits_whole_no_pad == float_decimal.digits.len) {
|
|
return;
|
|
}
|
|
|
|
try out_stream.writeAll(".");
|
|
|
|
// Zero-fill until we reach significant digits or run out of precision.
|
|
if (float_decimal.exp < 0) {
|
|
const zero_digit_count = @intCast(usize, -float_decimal.exp);
|
|
|
|
var i: usize = 0;
|
|
while (i < zero_digit_count) : (i += 1) {
|
|
try out_stream.writeAll("0");
|
|
}
|
|
}
|
|
|
|
try out_stream.writeAll(float_decimal.digits[num_digits_whole_no_pad..]);
|
|
}
|
|
}
|
|
|
|
pub fn formatBytes(
|
|
value: var,
|
|
options: FormatOptions,
|
|
comptime radix: usize,
|
|
out_stream: var,
|
|
) !void {
|
|
if (value == 0) {
|
|
return out_stream.writeAll("0B");
|
|
}
|
|
|
|
const mags_si = " kMGTPEZY";
|
|
const mags_iec = " KMGTPEZY";
|
|
const magnitude = switch (radix) {
|
|
1000 => math.min(math.log2(value) / comptime math.log2(1000), mags_si.len - 1),
|
|
1024 => math.min(math.log2(value) / 10, mags_iec.len - 1),
|
|
else => unreachable,
|
|
};
|
|
const new_value = lossyCast(f64, value) / math.pow(f64, lossyCast(f64, radix), lossyCast(f64, magnitude));
|
|
const suffix = switch (radix) {
|
|
1000 => mags_si[magnitude],
|
|
1024 => mags_iec[magnitude],
|
|
else => unreachable,
|
|
};
|
|
|
|
try formatFloatDecimal(new_value, options, out_stream);
|
|
|
|
if (suffix == ' ') {
|
|
return out_stream.writeAll("B");
|
|
}
|
|
|
|
const buf = switch (radix) {
|
|
1000 => &[_]u8{ suffix, 'B' },
|
|
1024 => &[_]u8{ suffix, 'i', 'B' },
|
|
else => unreachable,
|
|
};
|
|
return out_stream.writeAll(buf);
|
|
}
|
|
|
|
pub fn formatInt(
|
|
value: var,
|
|
base: u8,
|
|
uppercase: bool,
|
|
options: FormatOptions,
|
|
out_stream: var,
|
|
) !void {
|
|
const int_value = if (@TypeOf(value) == comptime_int) blk: {
|
|
const Int = math.IntFittingRange(value, value);
|
|
break :blk @as(Int, value);
|
|
} else
|
|
value;
|
|
|
|
if (@TypeOf(int_value).is_signed) {
|
|
return formatIntSigned(int_value, base, uppercase, options, out_stream);
|
|
} else {
|
|
return formatIntUnsigned(int_value, base, uppercase, options, out_stream);
|
|
}
|
|
}
|
|
|
|
fn formatIntSigned(
|
|
value: var,
|
|
base: u8,
|
|
uppercase: bool,
|
|
options: FormatOptions,
|
|
out_stream: var,
|
|
) !void {
|
|
const new_options = FormatOptions{
|
|
.width = if (options.width) |w| (if (w == 0) 0 else w - 1) else null,
|
|
.precision = options.precision,
|
|
.fill = options.fill,
|
|
};
|
|
const bit_count = @typeInfo(@TypeOf(value)).Int.bits;
|
|
const Uint = std.meta.Int(false, bit_count);
|
|
if (value < 0) {
|
|
try out_stream.writeAll("-");
|
|
const new_value = math.absCast(value);
|
|
return formatIntUnsigned(new_value, base, uppercase, new_options, out_stream);
|
|
} else if (options.width == null or options.width.? == 0) {
|
|
return formatIntUnsigned(@intCast(Uint, value), base, uppercase, options, out_stream);
|
|
} else {
|
|
try out_stream.writeAll("+");
|
|
const new_value = @intCast(Uint, value);
|
|
return formatIntUnsigned(new_value, base, uppercase, new_options, out_stream);
|
|
}
|
|
}
|
|
|
|
fn formatIntUnsigned(
|
|
value: var,
|
|
base: u8,
|
|
uppercase: bool,
|
|
options: FormatOptions,
|
|
out_stream: var,
|
|
) !void {
|
|
assert(base >= 2);
|
|
var buf: [math.max(@TypeOf(value).bit_count, 1)]u8 = undefined;
|
|
const min_int_bits = comptime math.max(@TypeOf(value).bit_count, @TypeOf(base).bit_count);
|
|
const MinInt = std.meta.Int(@TypeOf(value).is_signed, min_int_bits);
|
|
var a: MinInt = value;
|
|
var index: usize = buf.len;
|
|
|
|
while (true) {
|
|
const digit = a % base;
|
|
index -= 1;
|
|
buf[index] = digitToChar(@intCast(u8, digit), uppercase);
|
|
a /= base;
|
|
if (a == 0) break;
|
|
}
|
|
|
|
const digits_buf = buf[index..];
|
|
const width = options.width orelse 0;
|
|
const padding = if (width > digits_buf.len) (width - digits_buf.len) else 0;
|
|
|
|
if (padding > index) {
|
|
const zero_byte: u8 = options.fill;
|
|
var leftover_padding = padding - index;
|
|
while (true) {
|
|
try out_stream.writeAll(@as(*const [1]u8, &zero_byte)[0..]);
|
|
leftover_padding -= 1;
|
|
if (leftover_padding == 0) break;
|
|
}
|
|
mem.set(u8, buf[0..index], options.fill);
|
|
return out_stream.writeAll(&buf);
|
|
} else {
|
|
const padded_buf = buf[index - padding ..];
|
|
mem.set(u8, padded_buf[0..padding], options.fill);
|
|
return out_stream.writeAll(padded_buf);
|
|
}
|
|
}
|
|
|
|
pub fn formatIntBuf(out_buf: []u8, value: var, base: u8, uppercase: bool, options: FormatOptions) usize {
|
|
var fbs = std.io.fixedBufferStream(out_buf);
|
|
formatInt(value, base, uppercase, options, fbs.outStream()) catch unreachable;
|
|
return fbs.pos;
|
|
}
|
|
|
|
pub fn parseInt(comptime T: type, buf: []const u8, radix: u8) !T {
|
|
if (!T.is_signed) return parseUnsigned(T, buf, radix);
|
|
if (buf.len == 0) return @as(T, 0);
|
|
if (buf[0] == '-') {
|
|
return math.negate(try parseUnsigned(T, buf[1..], radix));
|
|
} else if (buf[0] == '+') {
|
|
return parseUnsigned(T, buf[1..], radix);
|
|
} else {
|
|
return parseUnsigned(T, buf, radix);
|
|
}
|
|
}
|
|
|
|
test "parseInt" {
|
|
std.testing.expect((parseInt(i32, "-10", 10) catch unreachable) == -10);
|
|
std.testing.expect((parseInt(i32, "+10", 10) catch unreachable) == 10);
|
|
std.testing.expect(if (parseInt(i32, " 10", 10)) |_| false else |err| err == error.InvalidCharacter);
|
|
std.testing.expect(if (parseInt(i32, "10 ", 10)) |_| false else |err| err == error.InvalidCharacter);
|
|
std.testing.expect(if (parseInt(u32, "-10", 10)) |_| false else |err| err == error.InvalidCharacter);
|
|
std.testing.expect((parseInt(u8, "255", 10) catch unreachable) == 255);
|
|
std.testing.expect(if (parseInt(u8, "256", 10)) |_| false else |err| err == error.Overflow);
|
|
}
|
|
|
|
pub const ParseUnsignedError = error{
|
|
/// The result cannot fit in the type specified
|
|
Overflow,
|
|
|
|
/// The input had a byte that was not a digit
|
|
InvalidCharacter,
|
|
};
|
|
|
|
pub fn parseUnsigned(comptime T: type, buf: []const u8, radix: u8) ParseUnsignedError!T {
|
|
var x: T = 0;
|
|
|
|
for (buf) |c| {
|
|
const digit = try charToDigit(c, radix);
|
|
|
|
if (x != 0) x = try math.mul(T, x, try math.cast(T, radix));
|
|
x = try math.add(T, x, try math.cast(T, digit));
|
|
}
|
|
|
|
return x;
|
|
}
|
|
|
|
test "parseUnsigned" {
|
|
std.testing.expect((try parseUnsigned(u16, "050124", 10)) == 50124);
|
|
std.testing.expect((try parseUnsigned(u16, "65535", 10)) == 65535);
|
|
std.testing.expectError(error.Overflow, parseUnsigned(u16, "65536", 10));
|
|
|
|
std.testing.expect((try parseUnsigned(u64, "0ffffffffffffffff", 16)) == 0xffffffffffffffff);
|
|
std.testing.expectError(error.Overflow, parseUnsigned(u64, "10000000000000000", 16));
|
|
|
|
std.testing.expect((try parseUnsigned(u32, "DeadBeef", 16)) == 0xDEADBEEF);
|
|
|
|
std.testing.expect((try parseUnsigned(u7, "1", 10)) == 1);
|
|
std.testing.expect((try parseUnsigned(u7, "1000", 2)) == 8);
|
|
|
|
std.testing.expectError(error.InvalidCharacter, parseUnsigned(u32, "f", 10));
|
|
std.testing.expectError(error.InvalidCharacter, parseUnsigned(u8, "109", 8));
|
|
|
|
std.testing.expect((try parseUnsigned(u32, "NUMBER", 36)) == 1442151747);
|
|
|
|
// these numbers should fit even though the radix itself doesn't fit in the destination type
|
|
std.testing.expect((try parseUnsigned(u1, "0", 10)) == 0);
|
|
std.testing.expect((try parseUnsigned(u1, "1", 10)) == 1);
|
|
std.testing.expectError(error.Overflow, parseUnsigned(u1, "2", 10));
|
|
std.testing.expect((try parseUnsigned(u1, "001", 16)) == 1);
|
|
std.testing.expect((try parseUnsigned(u2, "3", 16)) == 3);
|
|
std.testing.expectError(error.Overflow, parseUnsigned(u2, "4", 16));
|
|
}
|
|
|
|
pub const parseFloat = @import("fmt/parse_float.zig").parseFloat;
|
|
|
|
test "parseFloat" {
|
|
_ = @import("fmt/parse_float.zig");
|
|
}
|
|
|
|
pub fn charToDigit(c: u8, radix: u8) (error{InvalidCharacter}!u8) {
|
|
const value = switch (c) {
|
|
'0'...'9' => c - '0',
|
|
'A'...'Z' => c - 'A' + 10,
|
|
'a'...'z' => c - 'a' + 10,
|
|
else => return error.InvalidCharacter,
|
|
};
|
|
|
|
if (value >= radix) return error.InvalidCharacter;
|
|
|
|
return value;
|
|
}
|
|
|
|
pub fn digitToChar(digit: u8, uppercase: bool) u8 {
|
|
return switch (digit) {
|
|
0...9 => digit + '0',
|
|
10...35 => digit + ((if (uppercase) @as(u8, 'A') else @as(u8, 'a')) - 10),
|
|
else => unreachable,
|
|
};
|
|
}
|
|
|
|
pub const BufPrintError = error{
|
|
/// As much as possible was written to the buffer, but it was too small to fit all the printed bytes.
|
|
NoSpaceLeft,
|
|
};
|
|
pub fn bufPrint(buf: []u8, comptime fmt: []const u8, args: var) BufPrintError![]u8 {
|
|
var fbs = std.io.fixedBufferStream(buf);
|
|
try format(fbs.outStream(), fmt, args);
|
|
return fbs.getWritten();
|
|
}
|
|
|
|
// Count the characters needed for format. Useful for preallocating memory
|
|
pub fn count(comptime fmt: []const u8, args: var) u64 {
|
|
var counting_stream = std.io.countingOutStream(std.io.null_out_stream);
|
|
format(counting_stream.outStream(), fmt, args) catch |err| switch (err) {};
|
|
return counting_stream.bytes_written;
|
|
}
|
|
|
|
pub const AllocPrintError = error{OutOfMemory};
|
|
|
|
pub fn allocPrint(allocator: *mem.Allocator, comptime fmt: []const u8, args: var) AllocPrintError![]u8 {
|
|
const size = math.cast(usize, count(fmt, args)) catch |err| switch (err) {
|
|
// Output too long. Can't possibly allocate enough memory to display it.
|
|
error.Overflow => return error.OutOfMemory,
|
|
};
|
|
const buf = try allocator.alloc(u8, size);
|
|
return bufPrint(buf, fmt, args) catch |err| switch (err) {
|
|
error.NoSpaceLeft => unreachable, // we just counted the size above
|
|
};
|
|
}
|
|
|
|
pub fn allocPrint0(allocator: *mem.Allocator, comptime fmt: []const u8, args: var) AllocPrintError![:0]u8 {
|
|
const result = try allocPrint(allocator, fmt ++ "\x00", args);
|
|
return result[0 .. result.len - 1 :0];
|
|
}
|
|
|
|
test "bufPrintInt" {
|
|
var buffer: [100]u8 = undefined;
|
|
const buf = buffer[0..];
|
|
|
|
std.testing.expectEqualSlices(u8, "-1", bufPrintIntToSlice(buf, @as(i1, -1), 10, false, FormatOptions{}));
|
|
|
|
std.testing.expectEqualSlices(u8, "-101111000110000101001110", bufPrintIntToSlice(buf, @as(i32, -12345678), 2, false, FormatOptions{}));
|
|
std.testing.expectEqualSlices(u8, "-12345678", bufPrintIntToSlice(buf, @as(i32, -12345678), 10, false, FormatOptions{}));
|
|
std.testing.expectEqualSlices(u8, "-bc614e", bufPrintIntToSlice(buf, @as(i32, -12345678), 16, false, FormatOptions{}));
|
|
std.testing.expectEqualSlices(u8, "-BC614E", bufPrintIntToSlice(buf, @as(i32, -12345678), 16, true, FormatOptions{}));
|
|
|
|
std.testing.expectEqualSlices(u8, "12345678", bufPrintIntToSlice(buf, @as(u32, 12345678), 10, true, FormatOptions{}));
|
|
|
|
std.testing.expectEqualSlices(u8, " 666", bufPrintIntToSlice(buf, @as(u32, 666), 10, false, FormatOptions{ .width = 6 }));
|
|
std.testing.expectEqualSlices(u8, " 1234", bufPrintIntToSlice(buf, @as(u32, 0x1234), 16, false, FormatOptions{ .width = 6 }));
|
|
std.testing.expectEqualSlices(u8, "1234", bufPrintIntToSlice(buf, @as(u32, 0x1234), 16, false, FormatOptions{ .width = 1 }));
|
|
|
|
std.testing.expectEqualSlices(u8, "+42", bufPrintIntToSlice(buf, @as(i32, 42), 10, false, FormatOptions{ .width = 3 }));
|
|
std.testing.expectEqualSlices(u8, "-42", bufPrintIntToSlice(buf, @as(i32, -42), 10, false, FormatOptions{ .width = 3 }));
|
|
}
|
|
|
|
fn bufPrintIntToSlice(buf: []u8, value: var, base: u8, uppercase: bool, options: FormatOptions) []u8 {
|
|
return buf[0..formatIntBuf(buf, value, base, uppercase, options)];
|
|
}
|
|
|
|
test "parse u64 digit too big" {
|
|
_ = parseUnsigned(u64, "123a", 10) catch |err| {
|
|
if (err == error.InvalidCharacter) return;
|
|
unreachable;
|
|
};
|
|
unreachable;
|
|
}
|
|
|
|
test "parse unsigned comptime" {
|
|
comptime {
|
|
std.testing.expect((try parseUnsigned(usize, "2", 10)) == 2);
|
|
}
|
|
}
|
|
|
|
test "optional" {
|
|
{
|
|
const value: ?i32 = 1234;
|
|
try testFmt("optional: 1234\n", "optional: {}\n", .{value});
|
|
}
|
|
{
|
|
const value: ?i32 = null;
|
|
try testFmt("optional: null\n", "optional: {}\n", .{value});
|
|
}
|
|
}
|
|
|
|
test "error" {
|
|
{
|
|
const value: anyerror!i32 = 1234;
|
|
try testFmt("error union: 1234\n", "error union: {}\n", .{value});
|
|
}
|
|
{
|
|
const value: anyerror!i32 = error.InvalidChar;
|
|
try testFmt("error union: error.InvalidChar\n", "error union: {}\n", .{value});
|
|
}
|
|
}
|
|
|
|
test "int.small" {
|
|
{
|
|
const value: u3 = 0b101;
|
|
try testFmt("u3: 5\n", "u3: {}\n", .{value});
|
|
}
|
|
}
|
|
|
|
test "int.specifier" {
|
|
{
|
|
const value: u8 = 'a';
|
|
try testFmt("u8: a\n", "u8: {c}\n", .{value});
|
|
}
|
|
{
|
|
const value: u8 = 0b1100;
|
|
try testFmt("u8: 0b1100\n", "u8: 0b{b}\n", .{value});
|
|
}
|
|
}
|
|
|
|
test "int.padded" {
|
|
try testFmt("u8: ' 1'", "u8: '{:4}'", .{@as(u8, 1)});
|
|
try testFmt("u8: 'xxx1'", "u8: '{:x<4}'", .{@as(u8, 1)});
|
|
}
|
|
|
|
test "buffer" {
|
|
{
|
|
var buf1: [32]u8 = undefined;
|
|
var fbs = std.io.fixedBufferStream(&buf1);
|
|
try formatType(1234, "", FormatOptions{}, fbs.outStream(), default_max_depth);
|
|
std.testing.expect(mem.eql(u8, fbs.getWritten(), "1234"));
|
|
|
|
fbs.reset();
|
|
try formatType('a', "c", FormatOptions{}, fbs.outStream(), default_max_depth);
|
|
std.testing.expect(mem.eql(u8, fbs.getWritten(), "a"));
|
|
|
|
fbs.reset();
|
|
try formatType(0b1100, "b", FormatOptions{}, fbs.outStream(), default_max_depth);
|
|
std.testing.expect(mem.eql(u8, fbs.getWritten(), "1100"));
|
|
}
|
|
}
|
|
|
|
test "array" {
|
|
{
|
|
const value: [3]u8 = "abc".*;
|
|
try testFmt("array: abc\n", "array: {}\n", .{value});
|
|
try testFmt("array: abc\n", "array: {}\n", .{&value});
|
|
|
|
var buf: [100]u8 = undefined;
|
|
try testFmt(
|
|
try bufPrint(buf[0..], "array: [3]u8@{x}\n", .{@ptrToInt(&value)}),
|
|
"array: {*}\n",
|
|
.{&value},
|
|
);
|
|
}
|
|
}
|
|
|
|
test "slice" {
|
|
{
|
|
const value: []const u8 = "abc";
|
|
try testFmt("slice: abc\n", "slice: {}\n", .{value});
|
|
}
|
|
{
|
|
var runtime_zero: usize = 0;
|
|
const value = @intToPtr([*]align(1) const []const u8, 0xdeadbeef)[runtime_zero..runtime_zero];
|
|
try testFmt("slice: []const u8@deadbeef\n", "slice: {}\n", .{value});
|
|
}
|
|
|
|
try testFmt("buf: Test \n", "buf: {s:5}\n", .{"Test"});
|
|
try testFmt("buf: Test\n Other text", "buf: {s}\n Other text", .{"Test"});
|
|
}
|
|
|
|
test "pointer" {
|
|
{
|
|
const value = @intToPtr(*align(1) i32, 0xdeadbeef);
|
|
try testFmt("pointer: i32@deadbeef\n", "pointer: {}\n", .{value});
|
|
try testFmt("pointer: i32@deadbeef\n", "pointer: {*}\n", .{value});
|
|
}
|
|
{
|
|
const value = @intToPtr(fn () void, 0xdeadbeef);
|
|
try testFmt("pointer: fn() void@deadbeef\n", "pointer: {}\n", .{value});
|
|
}
|
|
{
|
|
const value = @intToPtr(fn () void, 0xdeadbeef);
|
|
try testFmt("pointer: fn() void@deadbeef\n", "pointer: {}\n", .{value});
|
|
}
|
|
}
|
|
|
|
test "cstr" {
|
|
try testFmt(
|
|
"cstr: Test C\n",
|
|
"cstr: {s}\n",
|
|
.{@ptrCast([*c]const u8, "Test C")},
|
|
);
|
|
try testFmt(
|
|
"cstr: Test C \n",
|
|
"cstr: {s:10}\n",
|
|
.{@ptrCast([*c]const u8, "Test C")},
|
|
);
|
|
}
|
|
|
|
test "filesize" {
|
|
try testFmt("file size: 63MiB\n", "file size: {Bi}\n", .{@as(usize, 63 * 1024 * 1024)});
|
|
try testFmt("file size: 66.06MB\n", "file size: {B:.2}\n", .{@as(usize, 63 * 1024 * 1024)});
|
|
}
|
|
|
|
test "struct" {
|
|
{
|
|
const Struct = struct {
|
|
field: u8,
|
|
};
|
|
const value = Struct{ .field = 42 };
|
|
try testFmt("struct: Struct{ .field = 42 }\n", "struct: {}\n", .{value});
|
|
try testFmt("struct: Struct{ .field = 42 }\n", "struct: {}\n", .{&value});
|
|
}
|
|
{
|
|
const Struct = struct {
|
|
a: u0,
|
|
b: u1,
|
|
};
|
|
const value = Struct{ .a = 0, .b = 1 };
|
|
try testFmt("struct: Struct{ .a = 0, .b = 1 }\n", "struct: {}\n", .{value});
|
|
}
|
|
}
|
|
|
|
test "enum" {
|
|
const Enum = enum {
|
|
One,
|
|
Two,
|
|
};
|
|
const value = Enum.Two;
|
|
try testFmt("enum: Enum.Two\n", "enum: {}\n", .{value});
|
|
try testFmt("enum: Enum.Two\n", "enum: {}\n", .{&value});
|
|
}
|
|
|
|
test "non-exhaustive enum" {
|
|
const Enum = enum(u16) {
|
|
One = 0x000f,
|
|
Two = 0xbeef,
|
|
_,
|
|
};
|
|
try testFmt("enum: Enum(15)\n", "enum: {}\n", .{Enum.One});
|
|
try testFmt("enum: Enum(48879)\n", "enum: {}\n", .{Enum.Two});
|
|
try testFmt("enum: Enum(4660)\n", "enum: {}\n", .{@intToEnum(Enum, 0x1234)});
|
|
try testFmt("enum: Enum(f)\n", "enum: {x}\n", .{Enum.One});
|
|
try testFmt("enum: Enum(beef)\n", "enum: {x}\n", .{Enum.Two});
|
|
try testFmt("enum: Enum(1234)\n", "enum: {x}\n", .{@intToEnum(Enum, 0x1234)});
|
|
}
|
|
|
|
test "float.scientific" {
|
|
try testFmt("f32: 1.34000003e+00", "f32: {e}", .{@as(f32, 1.34)});
|
|
try testFmt("f32: 1.23400001e+01", "f32: {e}", .{@as(f32, 12.34)});
|
|
try testFmt("f64: -1.234e+11", "f64: {e}", .{@as(f64, -12.34e10)});
|
|
try testFmt("f64: 9.99996e-40", "f64: {e}", .{@as(f64, 9.999960e-40)});
|
|
}
|
|
|
|
test "float.scientific.precision" {
|
|
try testFmt("f64: 1.40971e-42", "f64: {e:.5}", .{@as(f64, 1.409706e-42)});
|
|
try testFmt("f64: 1.00000e-09", "f64: {e:.5}", .{@as(f64, @bitCast(f32, @as(u32, 814313563)))});
|
|
try testFmt("f64: 7.81250e-03", "f64: {e:.5}", .{@as(f64, @bitCast(f32, @as(u32, 1006632960)))});
|
|
// libc rounds 1.000005e+05 to 1.00000e+05 but zig does 1.00001e+05.
|
|
// In fact, libc doesn't round a lot of 5 cases up when one past the precision point.
|
|
try testFmt("f64: 1.00001e+05", "f64: {e:.5}", .{@as(f64, @bitCast(f32, @as(u32, 1203982400)))});
|
|
}
|
|
|
|
test "float.special" {
|
|
try testFmt("f64: nan", "f64: {}", .{math.nan_f64});
|
|
// negative nan is not defined by IEE 754,
|
|
// and ARM thus normalizes it to positive nan
|
|
if (builtin.arch != builtin.Arch.arm) {
|
|
try testFmt("f64: -nan", "f64: {}", .{-math.nan_f64});
|
|
}
|
|
try testFmt("f64: inf", "f64: {}", .{math.inf_f64});
|
|
try testFmt("f64: -inf", "f64: {}", .{-math.inf_f64});
|
|
}
|
|
|
|
test "float.decimal" {
|
|
try testFmt("f64: 152314000000000000000000000000", "f64: {d}", .{@as(f64, 1.52314e+29)});
|
|
try testFmt("f32: 0", "f32: {d}", .{@as(f32, 0.0)});
|
|
try testFmt("f32: 1.1", "f32: {d:.1}", .{@as(f32, 1.1234)});
|
|
try testFmt("f32: 1234.57", "f32: {d:.2}", .{@as(f32, 1234.567)});
|
|
// -11.1234 is converted to f64 -11.12339... internally (errol3() function takes f64).
|
|
// -11.12339... is rounded back up to -11.1234
|
|
try testFmt("f32: -11.1234", "f32: {d:.4}", .{@as(f32, -11.1234)});
|
|
try testFmt("f32: 91.12345", "f32: {d:.5}", .{@as(f32, 91.12345)});
|
|
try testFmt("f64: 91.1234567890", "f64: {d:.10}", .{@as(f64, 91.12345678901235)});
|
|
try testFmt("f64: 0.00000", "f64: {d:.5}", .{@as(f64, 0.0)});
|
|
try testFmt("f64: 6", "f64: {d:.0}", .{@as(f64, 5.700)});
|
|
try testFmt("f64: 10.0", "f64: {d:.1}", .{@as(f64, 9.999)});
|
|
try testFmt("f64: 1.000", "f64: {d:.3}", .{@as(f64, 1.0)});
|
|
try testFmt("f64: 0.00030000", "f64: {d:.8}", .{@as(f64, 0.0003)});
|
|
try testFmt("f64: 0.00000", "f64: {d:.5}", .{@as(f64, 1.40130e-45)});
|
|
try testFmt("f64: 0.00000", "f64: {d:.5}", .{@as(f64, 9.999960e-40)});
|
|
}
|
|
|
|
test "float.libc.sanity" {
|
|
try testFmt("f64: 0.00001", "f64: {d:.5}", .{@as(f64, @bitCast(f32, @as(u32, 916964781)))});
|
|
try testFmt("f64: 0.00001", "f64: {d:.5}", .{@as(f64, @bitCast(f32, @as(u32, 925353389)))});
|
|
try testFmt("f64: 0.10000", "f64: {d:.5}", .{@as(f64, @bitCast(f32, @as(u32, 1036831278)))});
|
|
try testFmt("f64: 1.00000", "f64: {d:.5}", .{@as(f64, @bitCast(f32, @as(u32, 1065353133)))});
|
|
try testFmt("f64: 10.00000", "f64: {d:.5}", .{@as(f64, @bitCast(f32, @as(u32, 1092616192)))});
|
|
|
|
// libc differences
|
|
//
|
|
// This is 0.015625 exactly according to gdb. We thus round down,
|
|
// however glibc rounds up for some reason. This occurs for all
|
|
// floats of the form x.yyyy25 on a precision point.
|
|
try testFmt("f64: 0.01563", "f64: {d:.5}", .{@as(f64, @bitCast(f32, @as(u32, 1015021568)))});
|
|
// errol3 rounds to ... 630 but libc rounds to ...632. Grisu3
|
|
// also rounds to 630 so I'm inclined to believe libc is not
|
|
// optimal here.
|
|
try testFmt("f64: 18014400656965630.00000", "f64: {d:.5}", .{@as(f64, @bitCast(f32, @as(u32, 1518338049)))});
|
|
}
|
|
|
|
test "custom" {
|
|
const Vec2 = struct {
|
|
const SelfType = @This();
|
|
x: f32,
|
|
y: f32,
|
|
|
|
pub fn format(
|
|
self: SelfType,
|
|
comptime fmt: []const u8,
|
|
options: FormatOptions,
|
|
out_stream: var,
|
|
) !void {
|
|
if (fmt.len == 0 or comptime std.mem.eql(u8, fmt, "p")) {
|
|
return std.fmt.format(out_stream, "({d:.3},{d:.3})", .{ self.x, self.y });
|
|
} else if (comptime std.mem.eql(u8, fmt, "d")) {
|
|
return std.fmt.format(out_stream, "{d:.3}x{d:.3}", .{ self.x, self.y });
|
|
} else {
|
|
@compileError("Unknown format character: '" ++ fmt ++ "'");
|
|
}
|
|
}
|
|
};
|
|
|
|
var buf1: [32]u8 = undefined;
|
|
var value = Vec2{
|
|
.x = 10.2,
|
|
.y = 2.22,
|
|
};
|
|
try testFmt("point: (10.200,2.220)\n", "point: {}\n", .{&value});
|
|
try testFmt("dim: 10.200x2.220\n", "dim: {d}\n", .{&value});
|
|
|
|
// same thing but not passing a pointer
|
|
try testFmt("point: (10.200,2.220)\n", "point: {}\n", .{value});
|
|
try testFmt("dim: 10.200x2.220\n", "dim: {d}\n", .{value});
|
|
}
|
|
|
|
test "struct" {
|
|
const S = struct {
|
|
a: u32,
|
|
b: anyerror,
|
|
};
|
|
|
|
const inst = S{
|
|
.a = 456,
|
|
.b = error.Unused,
|
|
};
|
|
|
|
try testFmt("S{ .a = 456, .b = error.Unused }", "{}", .{inst});
|
|
}
|
|
|
|
test "union" {
|
|
const TU = union(enum) {
|
|
float: f32,
|
|
int: u32,
|
|
};
|
|
|
|
const UU = union {
|
|
float: f32,
|
|
int: u32,
|
|
};
|
|
|
|
const EU = extern union {
|
|
float: f32,
|
|
int: u32,
|
|
};
|
|
|
|
const tu_inst = TU{ .int = 123 };
|
|
const uu_inst = UU{ .int = 456 };
|
|
const eu_inst = EU{ .float = 321.123 };
|
|
|
|
try testFmt("TU{ .int = 123 }", "{}", .{tu_inst});
|
|
|
|
var buf: [100]u8 = undefined;
|
|
const uu_result = try bufPrint(buf[0..], "{}", .{uu_inst});
|
|
std.testing.expect(mem.eql(u8, uu_result[0..3], "UU@"));
|
|
|
|
const eu_result = try bufPrint(buf[0..], "{}", .{eu_inst});
|
|
std.testing.expect(mem.eql(u8, uu_result[0..3], "EU@"));
|
|
}
|
|
|
|
test "enum" {
|
|
const E = enum {
|
|
One,
|
|
Two,
|
|
Three,
|
|
};
|
|
|
|
const inst = E.Two;
|
|
|
|
try testFmt("E.Two", "{}", .{inst});
|
|
}
|
|
|
|
test "struct.self-referential" {
|
|
const S = struct {
|
|
const SelfType = @This();
|
|
a: ?*SelfType,
|
|
};
|
|
|
|
var inst = S{
|
|
.a = null,
|
|
};
|
|
inst.a = &inst;
|
|
|
|
try testFmt("S{ .a = S{ .a = S{ .a = S{ ... } } } }", "{}", .{inst});
|
|
}
|
|
|
|
test "struct.zero-size" {
|
|
const A = struct {
|
|
fn foo() void {}
|
|
};
|
|
const B = struct {
|
|
a: A,
|
|
c: i32,
|
|
};
|
|
|
|
const a = A{};
|
|
const b = B{ .a = a, .c = 0 };
|
|
|
|
try testFmt("B{ .a = A{ }, .c = 0 }", "{}", .{b});
|
|
}
|
|
|
|
test "bytes.hex" {
|
|
const some_bytes = "\xCA\xFE\xBA\xBE";
|
|
try testFmt("lowercase: cafebabe\n", "lowercase: {x}\n", .{some_bytes});
|
|
try testFmt("uppercase: CAFEBABE\n", "uppercase: {X}\n", .{some_bytes});
|
|
//Test Slices
|
|
try testFmt("uppercase: CAFE\n", "uppercase: {X}\n", .{some_bytes[0..2]});
|
|
try testFmt("lowercase: babe\n", "lowercase: {x}\n", .{some_bytes[2..]});
|
|
const bytes_with_zeros = "\x00\x0E\xBA\xBE";
|
|
try testFmt("lowercase: 000ebabe\n", "lowercase: {x}\n", .{bytes_with_zeros});
|
|
}
|
|
|
|
fn testFmt(expected: []const u8, comptime template: []const u8, args: var) !void {
|
|
var buf: [100]u8 = undefined;
|
|
const result = try bufPrint(buf[0..], template, args);
|
|
if (mem.eql(u8, result, expected)) return;
|
|
|
|
std.debug.warn("\n====== expected this output: =========\n", .{});
|
|
std.debug.warn("{}", .{expected});
|
|
std.debug.warn("\n======== instead found this: =========\n", .{});
|
|
std.debug.warn("{}", .{result});
|
|
std.debug.warn("\n======================================\n", .{});
|
|
return error.TestFailed;
|
|
}
|
|
|
|
pub fn trim(buf: []const u8) []const u8 {
|
|
var start: usize = 0;
|
|
while (start < buf.len and isWhiteSpace(buf[start])) : (start += 1) {}
|
|
|
|
var end: usize = buf.len;
|
|
while (true) {
|
|
if (end > start) {
|
|
const new_end = end - 1;
|
|
if (isWhiteSpace(buf[new_end])) {
|
|
end = new_end;
|
|
continue;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
return buf[start..end];
|
|
}
|
|
|
|
test "trim" {
|
|
std.testing.expect(mem.eql(u8, "abc", trim("\n abc \t")));
|
|
std.testing.expect(mem.eql(u8, "", trim(" ")));
|
|
std.testing.expect(mem.eql(u8, "", trim("")));
|
|
std.testing.expect(mem.eql(u8, "abc", trim(" abc")));
|
|
std.testing.expect(mem.eql(u8, "abc", trim("abc ")));
|
|
}
|
|
|
|
pub fn isWhiteSpace(byte: u8) bool {
|
|
return switch (byte) {
|
|
' ', '\t', '\n', '\r' => true,
|
|
else => false,
|
|
};
|
|
}
|
|
|
|
pub fn hexToBytes(out: []u8, input: []const u8) !void {
|
|
if (out.len * 2 < input.len)
|
|
return error.InvalidLength;
|
|
|
|
var in_i: usize = 0;
|
|
while (in_i != input.len) : (in_i += 2) {
|
|
const hi = try charToDigit(input[in_i], 16);
|
|
const lo = try charToDigit(input[in_i + 1], 16);
|
|
out[in_i / 2] = (hi << 4) | lo;
|
|
}
|
|
}
|
|
|
|
test "hexToBytes" {
|
|
const test_hex_str = "909A312BB12ED1F819B3521AC4C1E896F2160507FFC1C8381E3B07BB16BD1706";
|
|
var pb: [32]u8 = undefined;
|
|
try hexToBytes(pb[0..], test_hex_str);
|
|
try testFmt(test_hex_str, "{X}", .{pb});
|
|
}
|
|
|
|
test "formatIntValue with comptime_int" {
|
|
const value: comptime_int = 123456789123456789;
|
|
|
|
var buf: [20]u8 = undefined;
|
|
var fbs = std.io.fixedBufferStream(&buf);
|
|
try formatIntValue(value, "", FormatOptions{}, fbs.outStream());
|
|
std.testing.expect(mem.eql(u8, fbs.getWritten(), "123456789123456789"));
|
|
}
|
|
|
|
test "formatFloatValue with comptime_float" {
|
|
const value: comptime_float = 1.0;
|
|
|
|
var buf: [20]u8 = undefined;
|
|
var fbs = std.io.fixedBufferStream(&buf);
|
|
try formatFloatValue(value, "", FormatOptions{}, fbs.outStream());
|
|
std.testing.expect(mem.eql(u8, fbs.getWritten(), "1.0e+00"));
|
|
|
|
try testFmt("1.0e+00", "{}", .{value});
|
|
try testFmt("1.0e+00", "{}", .{1.0});
|
|
}
|
|
|
|
test "formatType max_depth" {
|
|
const Vec2 = struct {
|
|
const SelfType = @This();
|
|
x: f32,
|
|
y: f32,
|
|
|
|
pub fn format(
|
|
self: SelfType,
|
|
comptime fmt: []const u8,
|
|
options: FormatOptions,
|
|
out_stream: var,
|
|
) !void {
|
|
if (fmt.len == 0) {
|
|
return std.fmt.format(out_stream, "({d:.3},{d:.3})", .{ self.x, self.y });
|
|
} else {
|
|
@compileError("Unknown format string: '" ++ fmt ++ "'");
|
|
}
|
|
}
|
|
};
|
|
const E = enum {
|
|
One,
|
|
Two,
|
|
Three,
|
|
};
|
|
const TU = union(enum) {
|
|
const SelfType = @This();
|
|
float: f32,
|
|
int: u32,
|
|
ptr: ?*SelfType,
|
|
};
|
|
const S = struct {
|
|
const SelfType = @This();
|
|
a: ?*SelfType,
|
|
tu: TU,
|
|
e: E,
|
|
vec: Vec2,
|
|
};
|
|
|
|
var inst = S{
|
|
.a = null,
|
|
.tu = TU{ .ptr = null },
|
|
.e = E.Two,
|
|
.vec = Vec2{ .x = 10.2, .y = 2.22 },
|
|
};
|
|
inst.a = &inst;
|
|
inst.tu.ptr = &inst.tu;
|
|
|
|
var buf: [1000]u8 = undefined;
|
|
var fbs = std.io.fixedBufferStream(&buf);
|
|
try formatType(inst, "", FormatOptions{}, fbs.outStream(), 0);
|
|
std.testing.expect(mem.eql(u8, fbs.getWritten(), "S{ ... }"));
|
|
|
|
fbs.reset();
|
|
try formatType(inst, "", FormatOptions{}, fbs.outStream(), 1);
|
|
std.testing.expect(mem.eql(u8, fbs.getWritten(), "S{ .a = S{ ... }, .tu = TU{ ... }, .e = E.Two, .vec = (10.200,2.220) }"));
|
|
|
|
fbs.reset();
|
|
try formatType(inst, "", FormatOptions{}, fbs.outStream(), 2);
|
|
std.testing.expect(mem.eql(u8, fbs.getWritten(), "S{ .a = S{ .a = S{ ... }, .tu = TU{ ... }, .e = E.Two, .vec = (10.200,2.220) }, .tu = TU{ .ptr = TU{ ... } }, .e = E.Two, .vec = (10.200,2.220) }"));
|
|
|
|
fbs.reset();
|
|
try formatType(inst, "", FormatOptions{}, fbs.outStream(), 3);
|
|
std.testing.expect(mem.eql(u8, fbs.getWritten(), "S{ .a = S{ .a = S{ .a = S{ ... }, .tu = TU{ ... }, .e = E.Two, .vec = (10.200,2.220) }, .tu = TU{ .ptr = TU{ ... } }, .e = E.Two, .vec = (10.200,2.220) }, .tu = TU{ .ptr = TU{ .ptr = TU{ ... } } }, .e = E.Two, .vec = (10.200,2.220) }"));
|
|
}
|
|
|
|
test "positional" {
|
|
try testFmt("2 1 0", "{2} {1} {0}", .{ @as(usize, 0), @as(usize, 1), @as(usize, 2) });
|
|
try testFmt("2 1 0", "{2} {1} {}", .{ @as(usize, 0), @as(usize, 1), @as(usize, 2) });
|
|
try testFmt("0 0", "{0} {0}", .{@as(usize, 0)});
|
|
try testFmt("0 1", "{} {1}", .{ @as(usize, 0), @as(usize, 1) });
|
|
try testFmt("1 0 0 1", "{1} {} {0} {}", .{ @as(usize, 0), @as(usize, 1) });
|
|
}
|
|
|
|
test "positional with specifier" {
|
|
try testFmt("10.0", "{0d:.1}", .{@as(f64, 9.999)});
|
|
}
|
|
|
|
test "positional/alignment/width/precision" {
|
|
try testFmt("10.0", "{0d: >3.1}", .{@as(f64, 9.999)});
|
|
}
|
|
|
|
test "vector" {
|
|
if (builtin.arch == .mipsel or builtin.arch == .mips) {
|
|
// https://github.com/ziglang/zig/issues/3317
|
|
return error.SkipZigTest;
|
|
}
|
|
if (builtin.arch == .riscv64) {
|
|
// https://github.com/ziglang/zig/issues/4486
|
|
return error.SkipZigTest;
|
|
}
|
|
if (builtin.arch != .wasm32) {
|
|
// TODO investigate why this fails on wasm32
|
|
const vbool: std.meta.Vector(4, bool) = [_]bool{ true, false, true, false };
|
|
try testFmt("{ true, false, true, false }", "{}", .{vbool});
|
|
}
|
|
|
|
const vi64: std.meta.Vector(4, i64) = [_]i64{ -2, -1, 0, 1 };
|
|
const vu64: std.meta.Vector(4, u64) = [_]u64{ 1000, 2000, 3000, 4000 };
|
|
|
|
try testFmt("{ -2, -1, 0, 1 }", "{}", .{vi64});
|
|
try testFmt("{ - 2, - 1, + 0, + 1 }", "{d:5}", .{vi64});
|
|
try testFmt("{ 1000, 2000, 3000, 4000 }", "{}", .{vu64});
|
|
try testFmt("{ 3e8, 7d0, bb8, fa0 }", "{x}", .{vu64});
|
|
try testFmt("{ 1kB, 2kB, 3kB, 4kB }", "{B}", .{vu64});
|
|
try testFmt("{ 1000B, 1.953125KiB, 2.9296875KiB, 3.90625KiB }", "{Bi}", .{vu64});
|
|
}
|
|
|
|
test "enum-literal" {
|
|
try testFmt(".hello_world", "{}", .{.hello_world});
|
|
}
|
|
|
|
test "padding" {
|
|
try testFmt("Simple", "{}", .{"Simple"});
|
|
try testFmt("true ", "{:10}", .{true});
|
|
try testFmt(" true", "{:>10}", .{true});
|
|
try testFmt("======true", "{:=>10}", .{true});
|
|
try testFmt("true======", "{:=<10}", .{true});
|
|
try testFmt(" true ", "{:^10}", .{true});
|
|
try testFmt("===true===", "{:=^10}", .{true});
|
|
try testFmt("Minimum width", "{:18} width", .{"Minimum"});
|
|
try testFmt("==================Filled", "{:=>24}", .{"Filled"});
|
|
try testFmt(" Centered ", "{:^24}", .{"Centered"});
|
|
}
|