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const std = @import("std");
const expect = std.testing.expect;
const JavascriptString = @import("ast/base.zig").JavascriptString;
usingnamespace @import("string_types.zig");
pub fn containsChar(self: string, char: u8) bool {
return std.mem(char) != null;
}
pub fn indexOfChar(self: string, char: u8) ?usize {
return std.mem.indexOfScalar(@TypeOf(char), self, char);
}
pub fn lastIndexOfChar(self: string, char: u8) ?usize {
return std.mem.lastIndexOfScalar(u8, self, char);
}
pub fn lastIndexOf(self: string, str: u8) ?usize {
return std.mem.lastIndexOf(u8, self, str);
}
pub fn indexOf(self: string, str: u8) ?usize {
return std.mem.indexOf(u8, self, str);
}
pub fn startsWith(self: string, str: string) bool {
if (str.len > self.len) {
return false;
}
var i: usize = 0;
while (i < str.len) {
if (str[i] != self[i]) {
return false;
}
i += 1;
}
return true;
}
pub fn endsWithAny(self: string, str: string) bool {
const end = self[self.len - 1];
for (str) |char| {
if (char == end) {
return true;
}
}
return false;
}
pub fn lastNonwhitespace(self: string, str: string) bool {}
pub fn endsWithAnyComptime(self: string, comptime str: string) bool {
if (str.len < 10) {
const last = self[self.len - 1];
inline while (str) |char| {
if (char == last) {
return true;
}
}
return false;
} else {
return endsWithAny(self, str);
}
}
pub fn eql(self: string, other: anytype) bool {
return std.mem.eql(u8, self, other);
}
pub fn append(allocator: *std.mem.Allocator, self: string, other: string) !string {
return std.fmt.allocPrint(allocator, "{s}{s}", .{ self, other });
}
pub fn index(self: string, str: string) i32 {
if (std.mem.indexOf(u8, self, str)) |i| {
return @intCast(i32, i);
} else {
return -1;
}
}
pub fn eqlUtf16(comptime self: string, other: JavascriptString) bool {
return std.mem.eql(u16, std.unicode.utf8ToUtf16LeStringLiteral(self), other);
}
pub fn utf16EqlString(text: []u16, str: string) bool {
if (text.len > str.len) {
// Strings can't be equal if UTF-16 encoding is longer than UTF-8 encoding
return false;
}
var temp = [4]u8{ 0, 0, 0, 0 };
const n = text.len;
var j: usize = 0;
var i: usize = 0;
// TODO: is it safe to just make this u32 or u21?
var r1: i32 = undefined;
var k: u4 = 0;
while (i < n) : (i += 1) {
r1 = text[i];
if (r1 >= 0xD800 and r1 <= 0xDBFF and i + 1 < n) {
const r2: i32 = text[i + 1];
if (r2 >= 0xDC00 and r2 <= 0xDFFF) {
r1 = (r1 - 0xD800) << 10 | (r2 - 0xDC00) + 0x10000;
i += 1;
}
}
const width = encodeWTF8Rune(&temp, r1);
if (j + width > str.len) {
return false;
}
k = 0;
while (k < width) : (k += 1) {
if (temp[k] != str[j]) {
return false;
}
j += 1;
}
}
return j == str.len;
}
// This is a clone of golang's "utf8.EncodeRune" that has been modified to encode using
// WTF-8 instead. See https://simonsapin.github.io/wtf-8/ for more info.
pub fn encodeWTF8Rune(p: []u8, r: i32) u3 {
// Negative values are erroneous. Making it unsigned addresses the problem.
const i = @intCast(u32, r);
switch (i) {
0...0x7F => {
p[0] = @intCast(u8, r);
return 1;
},
(0x7F + 1)...0x7FF => {
p[0] = 0xC0 | @intCast(u8, r >> 6);
p[1] = 0x80 | @intCast(u8, r) & 0x3F;
return 2;
},
(0x7FF + 1)...0xFFFF => {
p[0] = 0xE0 | @intCast(u8, r >> 12);
p[1] = 0x80 | @intCast(u8, r >> 6) & 0x3F;
p[2] = 0x80 | @intCast(u8, r) & 0x3F;
return 3;
},
else => {
p[0] = 0xF0 | @intCast(u8, r >> 18);
p[1] = 0x80 | @intCast(u8, r >> 12) & 0x3F;
p[2] = 0x80 | @intCast(u8, r >> 6) & 0x3F;
p[3] = 0x80 | @intCast(u8, r) & 0x3F;
return 4;
},
}
}
pub fn toUTF16Buf(in: string, out: []u16) usize {
var utf8Iterator = std.unicode.Utf8Iterator{ .bytes = in, .i = 0 };
var c: u21 = 0;
var i: usize = 0;
while (utf8Iterator.nextCodepoint()) |code_point| {
switch (code_point) {
0...0xFFFF => {
out[i] = @intCast(u16, code_point);
i += 1;
},
else => {
c = code_point - 0x10000;
out[i] = @intCast(u16, 0xD800 + ((c >> 10) & 0x3FF));
i += 1;
out[i] = @intCast(u16, 0xDC00 + (c & 0x3FF));
i += 1;
},
}
}
return utf8Iterator.i;
}
pub fn toUTF16Alloc(in: string, allocator: *std.mem.Allocator) !JavascriptString {
var utf8Iterator = std.unicode.Utf8Iterator{ .bytes = in, .i = 0 };
var out = try std.ArrayList(u16).initCapacity(allocator, in.len);
var c: u21 = 0;
var i: usize = 0;
while (utf8Iterator.nextCodepoint()) |code_point| {
switch (code_point) {
0...0xFFFF => {
try out.append(@intCast(u16, code_point));
},
else => {
c = code_point - 0x10000;
try out.append(@intCast(u16, 0xD800 + ((c >> 10) & 0x3FF)));
try out.append(@intCast(u16, 0xDC00 + (c & 0x3FF)));
},
}
}
return out.toOwnedSlice();
}
pub fn containsNonBmpCodePoint(text: string) bool {
var iter = std.unicode.Utf8Iterator{ .bytes = text, .i = 0 };
while (iter.nextCodepoint()) |codepoint| {
if (codepoint > 0xFFFF) {
return true;
}
}
return false;
}
pub fn containsNonBmpCodePointUTF16(_text: JavascriptString) bool {
const n = _text.len;
if (n > 0) {
var i: usize = 0;
var c: u16 = 0;
var c2: u16 = 0;
var text = _text[0 .. n - 1];
while (i < n - 1) : (i += 1) {
c = text[i];
if (c >= 0xD800 and c <= 0xDBFF) {
c2 = text[i + 1];
if (c2 >= 0xDC00 and c2 <= 0xDFFF) {
return true;
}
}
}
}
return false;
}
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