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

use std::mem;
use std::ptr;

use crate::{check_status, sys, Result, Value};

pub use latin1::JsStringLatin1;
pub use utf16::JsStringUtf16;
pub use utf8::JsStringUtf8;

mod latin1;
mod utf16;
mod utf8;

#[derive(Clone, Copy)]
pub struct JsString(pub(crate) Value);

impl JsString {
  #[inline]
  pub fn utf8_len(&self) -> Result<usize> {
    let mut length = 0;
    check_status!(unsafe {
      sys::napi_get_value_string_utf8(self.0.env, self.0.value, ptr::null_mut(), 0, &mut length)
    })?;
    Ok(length as usize)
  }

  #[inline]
  pub fn utf16_len(&self) -> Result<usize> {
    let mut length = 0;
    check_status!(unsafe {
      sys::napi_get_value_string_utf16(self.0.env, self.0.value, ptr::null_mut(), 0, &mut length)
    })?;
    Ok(length as usize)
  }

  #[inline]
  pub fn latin1_len(&self) -> Result<usize> {
    let mut length = 0;
    check_status!(unsafe {
      sys::napi_get_value_string_latin1(self.0.env, self.0.value, ptr::null_mut(), 0, &mut length)
    })?;
    Ok(length as usize)
  }

  #[inline]
  pub fn into_utf8(self) -> Result<JsStringUtf8> {
    let mut written_char_count = 0;
    let len = self.utf8_len()? + 1;
    let mut result = Vec::with_capacity(len);
    let buf_ptr = result.as_mut_ptr();
    check_status!(unsafe {
      sys::napi_get_value_string_utf8(
        self.0.env,
        self.0.value,
        buf_ptr,
        len,
        &mut written_char_count,
      )
    })?;

    Ok(JsStringUtf8 {
      inner: self,
      buf: result,
    })
  }

  #[inline]
  pub fn into_utf16(self) -> Result<JsStringUtf16> {
    let mut written_char_count = 0usize;
    let len = self.utf16_len()? + 1;
    let mut result = Vec::with_capacity(len);
    let buf_ptr = result.as_mut_ptr();
    check_status!(unsafe {
      sys::napi_get_value_string_utf16(
        self.0.env,
        self.0.value,
        buf_ptr,
        len,
        &mut written_char_count,
      )
    })?;

    Ok(JsStringUtf16 {
      inner: self,
      buf: result,
    })
  }

  #[inline]
  pub fn into_latin1(self) -> Result<JsStringLatin1> {
    let mut written_char_count = 0usize;
    let len = self.latin1_len()? + 1;
    let mut result = Vec::with_capacity(len);
    let buf_ptr = result.as_mut_ptr();
    check_status!(unsafe {
      sys::napi_get_value_string_latin1(
        self.0.env,
        self.0.value,
        buf_ptr,
        len,
        &mut written_char_count,
      )
    })?;

    mem::forget(result);

    Ok(JsStringLatin1 {
      inner: self,
      buf: mem::ManuallyDrop::new(unsafe {
        Vec::from_raw_parts(buf_ptr as *mut _, written_char_count, written_char_count)
      }),
    })
  }
}