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Fix variable names & clarify comments

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Jared Ramirez 2021-06-18 12:53:09 -07:00
parent 5868518758
commit 711daee650
1 changed files with 14 additions and 13 deletions
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27
compiler/builtins/bitcode/src/dec.zig
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@ -126,17 +126,17 @@ pub const RocDec = struct {
var num_digits = std.fmt.formatIntBuf(digit_bytes[0..], num, 10, false, .{}); var num_digits = std.fmt.formatIntBuf(digit_bytes[0..], num, 10, false, .{});
// Get the slice for before the decimal point // Get the slice for before the decimal point
var before_digits_slice_t: []const u8 = undefined; var before_digits_slice: []const u8 = undefined;
var before_digits_offset: usize = 0; var before_digits_offset: usize = 0;
var before_digits_adjust: u6 = 0; var before_digits_adjust: u6 = 0;
if (num_digits > decimal_places) { if (num_digits > decimal_places) {
before_digits_offset = num_digits - decimal_places; before_digits_offset = num_digits - decimal_places;
before_digits_slice_t = digit_bytes[0..before_digits_offset]; before_digits_slice = digit_bytes[0..before_digits_offset];
} else { } else {
before_digits_adjust = @intCast(u6, math.absInt(@intCast(i7, num_digits) - decimal_places) catch { before_digits_adjust = @intCast(u6, math.absInt(@intCast(i7, num_digits) - decimal_places) catch {
std.debug.panic("TODO runtime exception for overflow when getting abs", .{}); std.debug.panic("TODO runtime exception for overflow when getting abs", .{});
}); });
before_digits_slice_t = "0"; before_digits_slice = "0";
} }
// Figure out how many trailing zeros there are // Figure out how many trailing zeros there are
@ -160,33 +160,34 @@ pub const RocDec = struct {
} }
// Figure out if we need to prepend any zeros to the after decimal point // Figure out if we need to prepend any zeros to the after decimal point
// For example, for the number 1.00023 we need to prepend 3 zeros after the decimal point // For example, for the number 0.000123 we need to prepend 3 zeros after the decimal point
// This will only be needed for numbers less 0.01, otherwise after_digits_slice will handle this
const after_zeros_num = if (num_digits < decimal_places) decimal_places - num_digits else 0; const after_zeros_num = if (num_digits < decimal_places) decimal_places - num_digits else 0;
const after_zeros_slice: []const u8 = leading_zeros[0..after_zeros_num]; const after_zeros_slice: []const u8 = leading_zeros[0..after_zeros_num];
// Get the slice for after the decimal point // Get the slice for after the decimal point
var after_digits_slice_t: []const u8 = undefined; var after_digits_slice: []const u8 = undefined;
if ((num_digits - before_digits_offset) == trailing_zeros) { if ((num_digits - before_digits_offset) == trailing_zeros) {
after_digits_slice_t = "0"; after_digits_slice = "0";
} else { } else {
after_digits_slice_t = digit_bytes[before_digits_offset .. num_digits - trailing_zeros]; after_digits_slice = digit_bytes[before_digits_offset .. num_digits - trailing_zeros];
} }
// Get the slice for the sign // Get the slice for the sign
const sign_slice: []const u8 = if (is_negative) "-" else leading_zeros[0..0]; const sign_slice: []const u8 = if (is_negative) "-" else leading_zeros[0..0];
// Hardcode adding a `1` for the '.' character // Hardcode adding a `1` for the '.' character
const str_len_t: usize = sign_slice.len + before_digits_slice_t.len + 1 + after_zeros_slice.len + after_digits_slice_t.len; const str_len: usize = sign_slice.len + before_digits_slice.len + 1 + after_zeros_slice.len + after_digits_slice.len;
// Join the slices together // Join the slices together
// We do `max_digits + 2` here becuase we need to account for a possible sign ('-') and the dot ('.'). // We do `max_digits + 2` here because we need to account for a possible sign ('-') and the dot ('.').
// Ideally, we'd use str_len_t here // Ideally, we'd use str_len here
var str_bytes_t: [max_digits + 2]u8 = undefined; var str_bytes: [max_digits + 2]u8 = undefined;
_ = std.fmt.bufPrint(str_bytes_t[0..str_len_t], "{s}{s}.{s}{s}", .{ sign_slice, before_digits_slice_t, after_zeros_slice, after_digits_slice_t }) catch { _ = std.fmt.bufPrint(str_bytes[0..str_len], "{s}{s}.{s}{s}", .{ sign_slice, before_digits_slice, after_zeros_slice, after_digits_slice }) catch {
std.debug.panic("TODO runtime exception failing to print slices", .{}); std.debug.panic("TODO runtime exception failing to print slices", .{});
}; };
return RocStr.init(&str_bytes_t, str_len_t); return RocStr.init(&str_bytes, str_len);
} }
pub fn negate(self: RocDec) ?RocDec { pub fn negate(self: RocDec) ?RocDec {