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feat(RocDec): fromString takes RocStr

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rvcas 2021-06-01 19:56:21 -04:00
parent f855228339
commit f6f2a13daa
1 changed files with 32 additions and 16 deletions
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48
compiler/builtins/bitcode/src/dec.zig
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@ -1,6 +1,8 @@
const std = @import("std");
const str = @import("str.zig");
const math = std.math;
const RocStr = str.RocStr;
pub const RocDec = struct {
num: i128,
@ -17,18 +19,22 @@ pub const RocDec = struct {
return .{ .num = @intCast(i128, num) * one_point_zero_i128 };
}
pub fn fromString(bytes_ptr: [*]const u8, length: usize) ?RocDec {
if (length == 0) {
pub fn fromString(roc_str: RocStr) ?RocDec {
if (roc_str.isEmpty()) {
return null;
}
var is_negative: bool = bytes_ptr[0] == '-';
const length = roc_str.len();
const roc_str_slice = roc_str.asSlice();
var is_negative: bool = roc_str_slice[0] == '-';
var initial_index: usize = if (is_negative) 1 else 0;
var point_index: ?usize = null;
var index: usize = 0;
while (index < length) {
var byte: u8 = bytes_ptr[index];
var byte: u8 = roc_str_slice[index];
if (byte == '.' and point_index == null) {
point_index = index;
index += 1;
@ -52,12 +58,12 @@ pub const RocDec = struct {
}
var diff_decimal_places = decimal_places - after_str_len;
var after_str = bytes_ptr[pi + 1 .. length];
var after_str = roc_str_slice[pi + 1 .. length];
var after_u64 = std.fmt.parseUnsigned(u64, after_str, 10) catch null;
after_val_i128 = if (after_u64) |f| @intCast(i128, f) * math.pow(i128, 10, diff_decimal_places) else null;
}
var before_str = bytes_ptr[initial_index..before_str_length];
var before_str = roc_str_slice[initial_index..before_str_length];
var before_val_not_adjusted = std.fmt.parseUnsigned(i128, before_str, 10) catch null;
var before_val_i128: ?i128 = null;
@ -321,61 +327,71 @@ test "fromU64" {
}
test "fromString: empty" {
var dec = RocDec.fromString("", 0);
var roc_str = RocStr.init("", 0);
var dec = RocDec.fromString(roc_str);
expectEqual(dec, null);
}
test "fromString: 0" {
var dec = RocDec.fromString("0", 1);
var roc_str = RocStr.init("0", 1);
var dec = RocDec.fromString(roc_str);
expectEqual(RocDec{ .num = 0 }, dec.?);
}
test "fromString: 1" {
var dec = RocDec.fromString("1", 1);
var roc_str = RocStr.init("1", 1);
var dec = RocDec.fromString(roc_str);
expectEqual(RocDec.one_point_zero, dec.?);
}
test "fromString: 123.45" {
var dec = RocDec.fromString("123.45", 6);
var roc_str = RocStr.init("123.45", 6);
var dec = RocDec.fromString(roc_str);
expectEqual(RocDec{ .num = 123450000000000000000 }, dec.?);
}
test "fromString: .45" {
var dec = RocDec.fromString(".45", 3);
var roc_str = RocStr.init(".45", 3);
var dec = RocDec.fromString(roc_str);
expectEqual(RocDec{ .num = 450000000000000000 }, dec.?);
}
test "fromString: 123" {
var dec = RocDec.fromString("123", 3);
var roc_str = RocStr.init("123", 3);
var dec = RocDec.fromString(roc_str);
expectEqual(RocDec{ .num = 123000000000000000000 }, dec.?);
}
test "fromString: abc" {
var dec = RocDec.fromString("abc", 3);
var roc_str = RocStr.init("abc", 3);
var dec = RocDec.fromString(roc_str);
expectEqual(dec, null);
}
test "fromString: 123.abc" {
var dec = RocDec.fromString("123.abc", 7);
var roc_str = RocStr.init("123.abc", 7);
var dec = RocDec.fromString(roc_str);
expectEqual(dec, null);
}
test "fromString: abc.123" {
var dec = RocDec.fromString("abc.123", 7);
var roc_str = RocStr.init("abc.123", 7);
var dec = RocDec.fromString(roc_str);
expectEqual(dec, null);
}
test "fromString: .123.1" {
var dec = RocDec.fromString(".123.1", 6);
var roc_str = RocStr.init(".123.1", 6);
var dec = RocDec.fromString(roc_str);
expectEqual(dec, null);
}