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Add native string -> int conversions. Fix to getline and add tgetline.

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This commit is contained in:
Christoffer Lerno
2022-12-01 16:13:52 +01:00
parent 07700ed2c5
commit 299ec1814b
3 changed files with 105 additions and 1 deletions
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90
lib/std/core/str.c3
View File

@@ -11,6 +11,13 @@ private const uint SURROGATE_BITS = 10;
private const uint SURROGATE_LOW_VALUE = 0xDC00;
private const uint SURROGATE_HIGH_VALUE = 0xD800;
fault NumberConversion
{
EMPTY_STRING,
NEGATIVE_VALUE,
MALFORMED_INTEGER,
INTEGER_OVERFLOW,
}
fn String join(char[][] s, char[] joiner)
{
if (!s.len) return (String)null;
@@ -37,6 +44,89 @@ macro bool char_in_set(char c, char[] set)
}
return false;
}
private macro char_is_space_tab(char c)
{
return c == ' ' || c == '\t';
}
private macro to_signed_integer($Type, char[] string)
{
usz len = string.len;
usz index = 0;
char* ptr = string.ptr;
while (index < len && char_is_space_tab(ptr[index])) index++;
if (len == index) return NumberConversion.EMPTY_STRING!;
bool is_negative;
switch (string[index])
{
case '-':
if ($Type.min == 0) return NumberConversion.NEGATIVE_VALUE!;
is_negative = true;
index++;
case '+':
index++;
default:
break;
}
if (len == index) return NumberConversion.MALFORMED_INTEGER!;
$Type base = 10;
if (string[index] == '0')
{
index++;
if (index == len) return ($Type)0;
switch (string[index])
{
case 'x':
case 'X':
base = 16;
index++;
case 'b':
case 'B':
base = 2;
index++;
case 'o':
case 'O':
base = 8;
index++;
default:
break;
}
if (len == index) return NumberConversion.MALFORMED_INTEGER!;
}
$Type value = 0;
while (index != len)
{
char c = {|
char ch = string[index++];
if (base != 16 || ch < 'A') return (char)(ch - '0');
if (ch <= 'F') return (char)(ch - 'A');
if (ch < 'a') return NumberConversion.MALFORMED_INTEGER!;
if (ch > 'f') return NumberConversion.MALFORMED_INTEGER!;
return (char)(ch - 'a');
|}?;
if (c >= base) return NumberConversion.MALFORMED_INTEGER!;
value = {|
if (is_negative)
{
$Type new_value = value * base - c;
if (new_value > value) return NumberConversion.INTEGER_OVERFLOW!;
return new_value;
}
$Type new_value = value * base + c;
if (new_value < value) return NumberConversion.INTEGER_OVERFLOW!;
return new_value;
|}?;
}
return value;
}
fn int128! to_int128(char[] string) = to_signed_integer(int128, string);
fn long! to_long(char[] string) = to_signed_integer(long, string);
fn int! to_int(char[] string) = to_signed_integer(int, string);
fn short! to_short(char[] string) = to_signed_integer(short, string);
fn ichar! to_ichar(char[] string) = to_signed_integer(ichar, string);
fn char[] trim(char[] string, char[] to_trim = "\t\n\r ")
{
usz start = 0;

14
lib/std/io/io.c3
View File

@@ -179,12 +179,26 @@ fn String File.getline(File* file, Allocator* allocator = mem::current_allocator
while (!file.eof())
{
int c = libc::fgetc(file.file);
if (c == -1) break;
if (c == '\n') break;
s.append_char((char)c);
}
return s;
}
/**
* @param [&in] file
* @require file.file `File must be initialized`
* @return "a zero terminated char[] (the pointer may be safely cast into a ZString)"
*/
fn char[] File.tgetline(File* file)
{
String s = file.getline(mem::temp_allocator());
ZString z = s.zstr();
return z[:s.len()];
}
fn char! File.getc(File* file)
{
int c = libc::fgetc(file.file);