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|
//! Validation of byte literals
use crate::{
ast::{self, AstNode, AstToken},
string_lexing::{self, StringComponentKind},
TextRange,
validation::char,
SyntaxError,
SyntaxErrorKind::*,
};
pub(super) fn validate_byte_node(node: &ast::Byte, errors: &mut Vec<SyntaxError>) {
let literal_text = node.text();
let literal_range = node.syntax().range();
let mut components = string_lexing::parse_byte_literal(literal_text);
let mut len = 0;
for component in &mut components {
len += 1;
let text = &literal_text[component.range];
let range = component.range + literal_range.start();
validate_byte_component(text, component.kind, range, errors);
}
if !components.has_closing_quote {
errors.push(SyntaxError::new(UnclosedByte, literal_range));
}
if let Some(range) = components.suffix {
errors.push(SyntaxError::new(InvalidSuffix, range + literal_range.start()));
}
if len == 0 {
errors.push(SyntaxError::new(EmptyByte, literal_range));
}
if len > 1 {
errors.push(SyntaxError::new(OverlongByte, literal_range));
}
}
pub(super) fn validate_byte_component(
text: &str,
kind: StringComponentKind,
range: TextRange,
errors: &mut Vec<SyntaxError>,
) {
use self::StringComponentKind::*;
match kind {
AsciiEscape => validate_byte_escape(text, range, errors),
AsciiCodeEscape => validate_byte_code_escape(text, range, errors),
UnicodeEscape => errors.push(SyntaxError::new(UnicodeEscapeForbidden, range)),
CodePoint => {
let c = text.chars().next().expect("Code points should be one character long");
// These bytes must always be escaped
if c == '\t' || c == '\r' || c == '\n' {
errors.push(SyntaxError::new(UnescapedByte, range));
}
// Only ASCII bytes are allowed
if c > 0x7F as char {
errors.push(SyntaxError::new(ByteOutOfRange, range));
}
}
IgnoreNewline => { /* always valid */ }
}
}
fn validate_byte_escape(text: &str, range: TextRange, errors: &mut Vec<SyntaxError>) {
if text.len() == 1 {
// Escape sequence consists only of leading `\`
errors.push(SyntaxError::new(EmptyByteEscape, range));
} else {
let escape_code = text.chars().skip(1).next().unwrap();
if !char::is_ascii_escape(escape_code) {
errors.push(SyntaxError::new(InvalidByteEscape, range));
}
}
}
fn validate_byte_code_escape(text: &str, range: TextRange, errors: &mut Vec<SyntaxError>) {
// A ByteCodeEscape has 4 chars, example: `\xDD`
if !text.is_ascii() {
errors.push(SyntaxError::new(MalformedByteCodeEscape, range));
} else if text.chars().count() < 4 {
errors.push(SyntaxError::new(TooShortByteCodeEscape, range));
} else {
assert!(text.chars().count() == 4, "ByteCodeEscape cannot be longer than 4 chars");
if u8::from_str_radix(&text[2..], 16).is_err() {
errors.push(SyntaxError::new(MalformedByteCodeEscape, range));
}
}
}
#[cfg(test)]
mod test {
use crate::{SourceFile, TreeArc};
fn build_file(literal: &str) -> TreeArc<SourceFile> {
let src = format!("const C: u8 = b'{}';", literal);
SourceFile::parse(&src)
}
fn assert_valid_byte(literal: &str) {
let file = build_file(literal);
assert!(file.errors().len() == 0, "Errors for literal '{}': {:?}", literal, file.errors());
}
fn assert_invalid_byte(literal: &str) {
let file = build_file(literal);
assert!(file.errors().len() > 0);
}
#[test]
fn test_ansi_codepoints() {
for byte in 0..128 {
match byte {
b'\n' | b'\r' | b'\t' => assert_invalid_byte(&(byte as char).to_string()),
b'\'' | b'\\' => { /* Ignore character close and backslash */ }
_ => assert_valid_byte(&(byte as char).to_string()),
}
}
for byte in 128..=255u8 {
assert_invalid_byte(&(byte as char).to_string());
}
}
#[test]
fn test_unicode_codepoints() {
let invalid = ["Ƒ", "バ", "メ", "﷽"];
for c in &invalid {
assert_invalid_byte(c);
}
}
#[test]
fn test_unicode_multiple_codepoints() {
let invalid = ["नी", "👨👨"];
for c in &invalid {
assert_invalid_byte(c);
}
}
#[test]
fn test_valid_byte_escape() {
let valid = [r"\'", "\"", "\\\\", "\\\"", r"\n", r"\r", r"\t", r"\0"];
for c in &valid {
assert_valid_byte(c);
}
}
#[test]
fn test_invalid_byte_escape() {
let invalid = [r"\a", r"\?", r"\"];
for c in &invalid {
assert_invalid_byte(c);
}
}
#[test]
fn test_valid_byte_code_escape() {
let valid = [r"\x00", r"\x7F", r"\x55", r"\xF0"];
for c in &valid {
assert_valid_byte(c);
}
}
#[test]
fn test_invalid_byte_code_escape() {
let invalid = [r"\x", r"\x7"];
for c in &invalid {
assert_invalid_byte(c);
}
}
#[test]
fn test_invalid_unicode_escape() {
let well_formed = [r"\u{FF}", r"\u{0}", r"\u{F}", r"\u{10FFFF}", r"\u{1_0__FF___FF_____}"];
for c in &well_formed {
assert_invalid_byte(c);
}
let invalid = [
r"\u",
r"\u{}",
r"\u{",
r"\u{FF",
r"\u{FFFFFF}",
r"\u{_F}",
r"\u{00FFFFF}",
r"\u{110000}",
];
for c in &invalid {
assert_invalid_byte(c);
}
}
}
|
