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test_lit.rs
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#![allow(
clippy::float_cmp,
clippy::needless_raw_string_hashes,
clippy::non_ascii_literal,
clippy::single_match_else,
clippy::uninlined_format_args
)]
#[macro_use]
mod macros;
use proc_macro2::{Delimiter, Group, Literal, Span, TokenStream, TokenTree};
use quote::ToTokens;
use std::ffi::CStr;
use std::str::FromStr;
use syn::{Lit, LitFloat, LitInt, LitStr};
#[track_caller]
fn lit(s: &str) -> Lit {
let mut tokens = TokenStream::from_str(s).unwrap().into_iter();
match tokens.next().unwrap() {
TokenTree::Literal(lit) => {
assert!(tokens.next().is_none());
Lit::new(lit)
}
wrong => panic!("{:?}", wrong),
}
}
#[test]
fn strings() {
#[track_caller]
fn test_string(s: &str, value: &str) {
let s = s.trim();
match lit(s) {
Lit::Str(lit) => {
assert_eq!(lit.value(), value);
let again = lit.into_token_stream().to_string();
if again != s {
test_string(&again, value);
}
}
wrong => panic!("{:?}", wrong),
}
}
test_string(r#" "" "#, "");
test_string(r#" "a" "#, "a");
test_string(r#" "\n" "#, "\n");
test_string(r#" "\r" "#, "\r");
test_string(r#" "\t" "#, "\t");
test_string(r#" "🐕" "#, "🐕"); // NOTE: This is an emoji
test_string(r#" "\"" "#, "\"");
test_string(r#" "'" "#, "'");
test_string(r#" "\u{1F415}" "#, "\u{1F415}");
test_string(r#" "\u{1_2__3_}" "#, "\u{123}");
test_string(
"\"contains\nnewlines\\\nescaped newlines\"",
"contains\nnewlinesescaped newlines",
);
test_string(
"\"escaped newline\\\n \x0C unsupported whitespace\"",
"escaped newline\x0C unsupported whitespace",
);
test_string("r\"raw\nstring\\\nhere\"", "raw\nstring\\\nhere");
test_string("\"...\"q", "...");
test_string("r\"...\"q", "...");
test_string("r##\"...\"##q", "...");
}
#[test]
fn byte_strings() {
#[track_caller]
fn test_byte_string(s: &str, value: &[u8]) {
let s = s.trim();
match lit(s) {
Lit::ByteStr(lit) => {
assert_eq!(lit.value(), value);
let again = lit.into_token_stream().to_string();
if again != s {
test_byte_string(&again, value);
}
}
wrong => panic!("{:?}", wrong),
}
}
test_byte_string(r#" b"" "#, b"");
test_byte_string(r#" b"a" "#, b"a");
test_byte_string(r#" b"\n" "#, b"\n");
test_byte_string(r#" b"\r" "#, b"\r");
test_byte_string(r#" b"\t" "#, b"\t");
test_byte_string(r#" b"\"" "#, b"\"");
test_byte_string(r#" b"'" "#, b"'");
test_byte_string(
"b\"contains\nnewlines\\\nescaped newlines\"",
b"contains\nnewlinesescaped newlines",
);
test_byte_string("br\"raw\nstring\\\nhere\"", b"raw\nstring\\\nhere");
test_byte_string("b\"...\"q", b"...");
test_byte_string("br\"...\"q", b"...");
test_byte_string("br##\"...\"##q", b"...");
}
#[test]
fn c_strings() {
#[track_caller]
fn test_c_string(s: &str, value: &CStr) {
let s = s.trim();
match lit(s) {
Lit::CStr(lit) => {
assert_eq!(*lit.value(), *value);
let again = lit.into_token_stream().to_string();
if again != s {
test_c_string(&again, value);
}
}
wrong => panic!("{:?}", wrong),
}
}
test_c_string(r#" c"" "#, c"");
test_c_string(r#" c"a" "#, c"a");
test_c_string(r#" c"\n" "#, c"\n");
test_c_string(r#" c"\r" "#, c"\r");
test_c_string(r#" c"\t" "#, c"\t");
test_c_string(r#" c"\\" "#, c"\\");
test_c_string(r#" c"\'" "#, c"'");
test_c_string(r#" c"\"" "#, c"\"");
test_c_string(
"c\"contains\nnewlines\\\nescaped newlines\"",
c"contains\nnewlinesescaped newlines",
);
test_c_string("cr\"raw\nstring\\\nhere\"", c"raw\nstring\\\nhere");
test_c_string("c\"...\"q", c"...");
test_c_string("cr\"...\"", c"...");
test_c_string("cr##\"...\"##", c"...");
test_c_string(
r#" c"hello\x80我叫\u{1F980}" "#, // from the RFC
c"hello\x80我叫\u{1F980}",
);
}
#[test]
fn bytes() {
#[track_caller]
fn test_byte(s: &str, value: u8) {
let s = s.trim();
match lit(s) {
Lit::Byte(lit) => {
assert_eq!(lit.value(), value);
let again = lit.into_token_stream().to_string();
assert_eq!(again, s);
}
wrong => panic!("{:?}", wrong),
}
}
test_byte(r#" b'a' "#, b'a');
test_byte(r#" b'\n' "#, b'\n');
test_byte(r#" b'\r' "#, b'\r');
test_byte(r#" b'\t' "#, b'\t');
test_byte(r#" b'\'' "#, b'\'');
test_byte(r#" b'"' "#, b'"');
test_byte(r#" b'a'q "#, b'a');
}
#[test]
fn chars() {
#[track_caller]
fn test_char(s: &str, value: char) {
let s = s.trim();
match lit(s) {
Lit::Char(lit) => {
assert_eq!(lit.value(), value);
let again = lit.into_token_stream().to_string();
if again != s {
test_char(&again, value);
}
}
wrong => panic!("{:?}", wrong),
}
}
test_char(r#" 'a' "#, 'a');
test_char(r#" '\n' "#, '\n');
test_char(r#" '\r' "#, '\r');
test_char(r#" '\t' "#, '\t');
test_char(r#" '🐕' "#, '🐕'); // NOTE: This is an emoji
test_char(r#" '\'' "#, '\'');
test_char(r#" '"' "#, '"');
test_char(r#" '\u{1F415}' "#, '\u{1F415}');
test_char(r#" 'a'q "#, 'a');
}
#[test]
fn ints() {
#[track_caller]
fn test_int(s: &str, value: u64, suffix: &str) {
match lit(s) {
Lit::Int(lit) => {
assert_eq!(lit.base10_digits().parse::<u64>().unwrap(), value);
assert_eq!(lit.suffix(), suffix);
let again = lit.into_token_stream().to_string();
if again != s {
test_int(&again, value, suffix);
}
}
wrong => panic!("{:?}", wrong),
}
}
test_int("5", 5, "");
test_int("5u32", 5, "u32");
test_int("0E", 0, "E");
test_int("0ECMA", 0, "ECMA");
test_int("0o0A", 0, "A");
test_int("5_0", 50, "");
test_int("5_____0_____", 50, "");
test_int("0x7f", 127, "");
test_int("0x7F", 127, "");
test_int("0b1001", 9, "");
test_int("0o73", 59, "");
test_int("0x7Fu8", 127, "u8");
test_int("0b1001i8", 9, "i8");
test_int("0o73u32", 59, "u32");
test_int("0x__7___f_", 127, "");
test_int("0x__7___F_", 127, "");
test_int("0b_1_0__01", 9, "");
test_int("0o_7__3", 59, "");
test_int("0x_7F__u8", 127, "u8");
test_int("0b__10__0_1i8", 9, "i8");
test_int("0o__7__________________3u32", 59, "u32");
test_int("0e1\u{5c5}", 0, "e1\u{5c5}");
}
#[test]
fn floats() {
#[track_caller]
fn test_float(s: &str, value: f64, suffix: &str) {
match lit(s) {
Lit::Float(lit) => {
assert_eq!(lit.base10_digits().parse::<f64>().unwrap(), value);
assert_eq!(lit.suffix(), suffix);
let again = lit.into_token_stream().to_string();
if again != s {
test_float(&again, value, suffix);
}
}
wrong => panic!("{:?}", wrong),
}
}
test_float("5.5", 5.5, "");
test_float("5.5E12", 5.5e12, "");
test_float("5.5e12", 5.5e12, "");
test_float("1.0__3e-12", 1.03e-12, "");
test_float("1.03e+12", 1.03e12, "");
test_float("9e99e99", 9e99, "e99");
test_float("1e_0", 1.0, "");
test_float("0.0ECMA", 0.0, "ECMA");
}
#[test]
fn negative() {
let span = Span::call_site();
assert_eq!("-1", LitInt::new("-1", span).to_string());
assert_eq!("-1i8", LitInt::new("-1i8", span).to_string());
assert_eq!("-1i16", LitInt::new("-1i16", span).to_string());
assert_eq!("-1i32", LitInt::new("-1i32", span).to_string());
assert_eq!("-1i64", LitInt::new("-1i64", span).to_string());
assert_eq!("-1.5", LitFloat::new("-1.5", span).to_string());
assert_eq!("-1.5f32", LitFloat::new("-1.5f32", span).to_string());
assert_eq!("-1.5f64", LitFloat::new("-1.5f64", span).to_string());
}
#[test]
fn suffix() {
#[track_caller]
fn get_suffix(token: &str) -> String {
let lit = syn::parse_str::<Lit>(token).unwrap();
match lit {
Lit::Str(lit) => lit.suffix().to_owned(),
Lit::ByteStr(lit) => lit.suffix().to_owned(),
Lit::CStr(lit) => lit.suffix().to_owned(),
Lit::Byte(lit) => lit.suffix().to_owned(),
Lit::Char(lit) => lit.suffix().to_owned(),
Lit::Int(lit) => lit.suffix().to_owned(),
Lit::Float(lit) => lit.suffix().to_owned(),
_ => unimplemented!(),
}
}
assert_eq!(get_suffix("\"\"s"), "s");
assert_eq!(get_suffix("r\"\"r"), "r");
assert_eq!(get_suffix("r#\"\"#r"), "r");
assert_eq!(get_suffix("b\"\"b"), "b");
assert_eq!(get_suffix("br\"\"br"), "br");
assert_eq!(get_suffix("br#\"\"#br"), "br");
assert_eq!(get_suffix("c\"\"c"), "c");
assert_eq!(get_suffix("cr\"\"cr"), "cr");
assert_eq!(get_suffix("cr#\"\"#cr"), "cr");
assert_eq!(get_suffix("'c'c"), "c");
assert_eq!(get_suffix("b'b'b"), "b");
assert_eq!(get_suffix("1i32"), "i32");
assert_eq!(get_suffix("1_i32"), "i32");
assert_eq!(get_suffix("1.0f32"), "f32");
assert_eq!(get_suffix("1.0_f32"), "f32");
}
#[test]
fn test_deep_group_empty() {
let tokens = TokenStream::from_iter([TokenTree::Group(Group::new(
Delimiter::None,
TokenStream::from_iter([TokenTree::Group(Group::new(
Delimiter::None,
TokenStream::from_iter([TokenTree::Literal(Literal::string("hi"))]),
))]),
))]);
snapshot!(tokens as Lit, @r#""hi""# );
}
#[test]
fn test_error() {
let err = syn::parse_str::<LitStr>("...").unwrap_err();
assert_eq!("expected string literal", err.to_string());
let err = syn::parse_str::<LitStr>("5").unwrap_err();
assert_eq!("expected string literal", err.to_string());
}