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Formatting

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This commit is contained in:
tgschultz 2018-05-30 10:41:48 -05:00
parent 4e1d0a59fa
commit 8938c16f38
1 changed files with 19 additions and 6 deletions
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25
std/fmt/index.zig
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@ -11,7 +11,10 @@ const max_int_digits = 65;
/// Renders fmt string with args, calling output with slices of bytes.
/// If `output` returns an error, the error is returned from `format` and
/// `output` is not called again.
pub fn format(context: var, comptime Errors: type, output: fn(@typeOf(context), []const u8) Errors!void, comptime fmt: []const u8, args: ...) Errors!void {
pub fn format(context: var, comptime Errors: type,
output: fn(@typeOf(context), []const u8) Errors!void, comptime fmt: []const u8,
args: ...) Errors!void
{
const State = enum {
Start,
OpenBrace,
@ -281,7 +284,9 @@ pub fn formatText(bytes: []const u8, comptime fmt: []const u8, context: var,
return output(context, bytes);
}
pub fn formatAsciiChar(c: u8, context: var, comptime Errors: type, output: fn(@typeOf(context), []const u8) Errors!void) Errors!void {
pub fn formatAsciiChar(c: u8, context: var, comptime Errors: type,
output: fn(@typeOf(context), []const u8) Errors!void) Errors!void
{
return output(context, (&c)[0..1]);
}
@ -300,7 +305,9 @@ pub fn formatBuf(buf: []const u8, width: usize, context: var,
// 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, maybe_precision: ?usize, context: var, comptime Errors: type, output: fn(@typeOf(context), []const u8) Errors!void) Errors!void {
pub fn formatFloatScientific(value: var, maybe_precision: ?usize, context: var,
comptime Errors: type, output: fn(@typeOf(context), []const u8) Errors!void) Errors!void
{
var x = f64(value);
// Errol doesn't handle these special cases.
@ -389,7 +396,9 @@ pub fn formatFloatScientific(value: var, maybe_precision: ?usize, context: var,
// 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, maybe_precision: ?usize, context: var, comptime Errors: type, output: fn(@typeOf(context), []const u8) Errors!void) Errors!void {
pub fn formatFloatDecimal(value: var, maybe_precision: ?usize, context: var, comptime Errors: type,
output: fn(@typeOf(context), []const u8) Errors!void) Errors!void
{
var x = f64(value);
// Errol doesn't handle these special cases.
@ -579,7 +588,9 @@ pub fn formatInt(
}
}
fn formatIntSigned(value: var, base: u8, uppercase: bool, width: usize, context: var, comptime Errors: type, output: fn(@typeOf(context), []const u8) Errors!void) Errors!void {
fn formatIntSigned(value: var, base: u8, uppercase: bool, width: usize, context: var,
comptime Errors: type, output: fn(@typeOf(context), []const u8) Errors!void) Errors!void
{
const uint = @IntType(false, @typeOf(value).bit_count);
if (value < 0) {
const minus_sign: u8 = '-';
@ -598,7 +609,9 @@ fn formatIntSigned(value: var, base: u8, uppercase: bool, width: usize, context:
}
}
fn formatIntUnsigned(value: var, base: u8, uppercase: bool, width: usize, context: var, comptime Errors: type, output: fn(@typeOf(context), []const u8) Errors!void) Errors!void {
fn formatIntUnsigned(value: var, base: u8, uppercase: bool, width: usize, context: var,
comptime Errors: type, output: fn(@typeOf(context), []const u8) Errors!void) Errors!void
{
// max_int_digits accounts for the minus sign. when printing an unsigned
// number we don't need to do that.
var buf: [max_int_digits - 1]u8 = undefined;