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js: implement more functions for JS backend (#12167)

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playX
2021-10-13 09:40:14 +03:00
committed by GitHub
parent ade5774313
commit d373eba79b
7 changed files with 134 additions and 3 deletions
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26
vlib/builtin/js/byte.js.v
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@ -68,3 +68,29 @@ pub fn (c byte) is_letter() bool {
pub fn (c byte) is_alnum() bool {
return c.is_letter() || c.is_digit()
}
// Define this on byte as well, so that we can do `s[0].is_capital()`
pub fn (c byte) is_capital() bool {
return c >= `A` && c <= `Z`
}
// str_escaped returns the contents of `byte` as an escaped `string`.
// Example: assert byte(0).str_escaped() == r'`\0`'
pub fn (b byte) str_escaped() string {
mut str := ''
match b {
0 { str = r'`\0`' }
7 { str = r'`\a`' }
8 { str = r'`\b`' }
9 { str = r'`\t`' }
10 { str = r'`\n`' }
11 { str = r'`\v`' }
12 { str = r'`\f`' }
13 { str = r'`\r`' }
27 { str = r'`\e`' }
32...126 { str = b.ascii_str() }
else { str = '0x' + b.hex() }
}
return str
}