1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196

use crate::core::{
    def::{NSTDAny, NSTDBool, NSTDChar, NSTDErrorCode},
    range::NSTDURange,
    slice::NSTDSlice,
    NSTD_CORE_NULL,
};

/// Represents a view into an array of UTF-8 chars.
#[repr(C)]
#[derive(Clone, Copy, Debug)]
pub struct NSTDStr {
    /// UTF-8 encoded bytes.
    pub bytes: NSTDSlice,
}

/// Creates a new `NSTDStr` from a cstring.
/// Parameters:
///     `const NSTDChar *const cstr` - The cstring.
/// Returns: `NSTDStr str` - The new string slice, excluding the null terminator.
#[inline]
#[cfg_attr(feature = "clib", no_mangle)]
pub unsafe extern "C" fn nstd_core_str_from_cstring(cstring: *const NSTDChar) -> NSTDStr {
    const C_CHAR_SIZE: usize = core::mem::size_of::<NSTDChar>();
    let size = crate::core::cstr::nstd_core_cstr_len(cstring);
    NSTDStr {
        bytes: crate::core::slice::nstd_core_slice_new(size, C_CHAR_SIZE, cstring as NSTDAny),
    }
}

/// Creates a new `NSTDStr` from a cstring.
/// Parameters:
///     `const NSTDChar *const cstr` - The cstring.
/// Returns: `NSTDStr str` - The new string slice, including the null terminator.
#[inline]
#[cfg_attr(feature = "clib", no_mangle)]
pub unsafe extern "C" fn nstd_core_str_from_cstring_with_null(cstring: *const NSTDChar) -> NSTDStr {
    let mut str = nstd_core_str_from_cstring(cstring);
    str.bytes.size += 1;
    str
}

/// Creates a new `NSTDStr` from an `NSTDSlice`. `slice->element_size` must be the size of one byte.
/// Parameters:
///     `const NSTDSlice *const slice` - The UTF-8 encoded byte slice.
/// Returns: `NSTDStr str` - The new string slice.
#[inline]
#[cfg_attr(feature = "clib", no_mangle)]
pub unsafe extern "C" fn nstd_core_str_from_bytes(slice: &NSTDSlice) -> NSTDStr {
    NSTDStr {
        bytes: match slice.ptr.size == 1 {
            true => *slice,
            _ => crate::core::slice::nstd_core_slice_new(0, 0, NSTD_CORE_NULL),
        },
    }
}

/// Gets the length of a string slice.
/// Parameters:
///     `const NSTDStr *const str` - The string slice.
/// Returns: `NSTDUSize len` - The length of the UTF-8 encoded string slice, -1 on error.
#[inline]
#[cfg_attr(feature = "clib", no_mangle)]
pub unsafe extern "C" fn nstd_core_str_len(str: &NSTDStr) -> usize {
    if let Ok(str) = core::str::from_utf8(str.bytes.as_byte_slice()) {
        return str.chars().count();
    }
    usize::MAX
}

/// Returns the number of bytes used by this string slice.
/// Parameters:
///     `const NSTDStr *const str` - The string slice.
/// Returns: `NSTDUSize len` - The number of bytes in the string slice.
#[inline]
#[cfg_attr(feature = "clib", no_mangle)]
pub unsafe extern "C" fn nstd_core_str_byte_len(str: &NSTDStr) -> usize {
    str.bytes.byte_count()
}

/// Returns a subslice of `str` based on `range`.
/// Parameters:
///     `const NSTDStr *const str` - The string slice.
///     `const NSTDURange *const range` - The range of bytes to make a subslice out of.
/// Returns: `NSTDStr subslice` - The string subslice.
#[inline]
#[cfg_attr(feature = "clib", no_mangle)]
pub unsafe extern "C" fn nstd_core_str_get(str: &NSTDStr, range: &NSTDURange) -> NSTDStr {
    let len = range.end - range.start;
    let start = str.bytes.ptr.raw.add(range.start);
    let slice = crate::core::slice::nstd_core_slice_new(len, str.bytes.ptr.size, start);
    nstd_core_str_from_bytes(&slice)
}

/// Checks if a string slice is entirely ASCII.
/// Parameters:
///     `const NSTDStr *const str` - The string slice.
/// Returns: `NSTDBool is_ascii` - True if the string slice is entirely ASCII.
#[inline]
#[cfg_attr(feature = "clib", no_mangle)]
pub unsafe extern "C" fn nstd_core_str_is_ascii(str: &NSTDStr) -> NSTDBool {
    if let Ok(str) = core::str::from_utf8(str.bytes.as_byte_slice()) {
        return NSTDBool::from(str.is_ascii());
    }
    NSTDBool::NSTD_BOOL_FALSE
}

/// Compares two string slices.
/// Parameters:
///     `const NSTDStr *const str1` - The first string slice.
///     `const NSTDStr *const str2` - The second string slice.
/// Returns: `NSTDBool is_eq` - True if the two slices are equal.
#[inline]
#[cfg_attr(feature = "clib", no_mangle)]
pub unsafe extern "C" fn nstd_core_str_compare(str1: &NSTDStr, str2: &NSTDStr) -> NSTDBool {
    NSTDBool::from(str1.bytes.as_byte_slice() == str2.bytes.as_byte_slice())
}

/// Generates pattern checking functions.
macro_rules! nstd_str_pat_check {
    ($fn_name: ident, $method: ident) => {
        #[cfg_attr(feature = "clib", no_mangle)]
        pub unsafe extern "C" fn $fn_name(str: &NSTDStr, pattern: &NSTDStr) -> NSTDBool {
            if let Ok(str) = core::str::from_utf8(str.bytes.as_byte_slice()) {
                if let Ok(pattern) = core::str::from_utf8(pattern.bytes.as_byte_slice()) {
                    return NSTDBool::from(str.$method(pattern));
                }
            }
            NSTDBool::NSTD_BOOL_FALSE
        }
    };
}
nstd_str_pat_check!(nstd_core_str_contains, contains);
nstd_str_pat_check!(nstd_core_str_starts_with, starts_with);
nstd_str_pat_check!(nstd_core_str_ends_with, ends_with);

/// Generates pattern finding functions.
macro_rules! nstd_str_find {
    ($fn_name: ident, $method: ident) => {
        #[cfg_attr(feature = "clib", no_mangle)]
        pub unsafe extern "C" fn $fn_name(str: &NSTDStr, pattern: &NSTDStr) -> usize {
            if let Ok(str) = core::str::from_utf8(str.bytes.as_byte_slice()) {
                if let Ok(pattern) = core::str::from_utf8(pattern.bytes.as_byte_slice()) {
                    return str.$method(pattern).unwrap_or(usize::MAX);
                }
            }
            usize::MAX
        }
    };
}
nstd_str_find!(nstd_core_str_find, find);
nstd_str_find!(nstd_core_str_find_last, rfind);

/// Generates `nstd_core_str_to_*case` functions.
macro_rules! nstd_core_str_to_case {
    ($name: ident, $method: ident) => {
        #[inline]
        #[cfg_attr(feature = "clib", no_mangle)]
        pub unsafe extern "C" fn $name(str: &mut NSTDStr) -> NSTDErrorCode {
            if let Ok(str) = core::str::from_utf8_mut(str.bytes.as_byte_slice_mut()) {
                str.$method();
                return 0;
            }
            1
        }
    };
}
nstd_core_str_to_case!(nstd_core_str_to_uppercase, make_ascii_uppercase);
nstd_core_str_to_case!(nstd_core_str_to_lowercase, make_ascii_lowercase);

/// Generates str => number conversion functions.
macro_rules! nstd_str_to_num {
    ($name: ident, $type: ty) => {
        #[cfg_attr(feature = "clib", no_mangle)]
        pub unsafe extern "C" fn $name(str: &NSTDStr, is_err: &mut NSTDErrorCode) -> $type {
            if let Ok(str) = core::str::from_utf8(str.bytes.as_byte_slice()) {
                if let Ok(v) = str.parse::<$type>() {
                    return v;
                }
            }
            *is_err = 1;
            <$type>::default()
        }
    };
}
nstd_str_to_num!(nstd_core_str_to_f32, f32);
nstd_str_to_num!(nstd_core_str_to_f64, f64);
nstd_str_to_num!(nstd_core_str_to_i8, i8);
nstd_str_to_num!(nstd_core_str_to_u8, u8);
nstd_str_to_num!(nstd_core_str_to_i16, i16);
nstd_str_to_num!(nstd_core_str_to_u16, u16);
nstd_str_to_num!(nstd_core_str_to_i32, i32);
nstd_str_to_num!(nstd_core_str_to_u32, u32);
nstd_str_to_num!(nstd_core_str_to_i64, i64);
nstd_str_to_num!(nstd_core_str_to_u64, u64);
nstd_str_to_num!(nstd_core_str_to_isize, isize);
nstd_str_to_num!(nstd_core_str_to_usize, usize);