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|
use crate::{
ast::{self, AstNode, AstToken},
string_lexing,
SyntaxError,
SyntaxErrorKind::*,
};
use super::char;
pub(crate) fn validate_string_node(node: &ast::String, errors: &mut Vec<SyntaxError>) {
let literal_text = node.text();
let literal_range = node.syntax().range();
let mut components = string_lexing::parse_string_literal(literal_text);
for component in &mut components {
let range = component.range + literal_range.start();
// Chars must escape \t, \n and \r codepoints, but strings don't
let text = &literal_text[component.range];
match text {
"\t" | "\n" | "\r" => { /* always valid */ }
_ => char::validate_char_component(text, component.kind, range, errors),
}
}
if !components.has_closing_quote {
errors.push(SyntaxError::new(UnclosedString, literal_range));
}
if let Some(range) = components.suffix {
errors.push(SyntaxError::new(InvalidSuffix, range + literal_range.start()));
}
}
#[cfg(test)]
mod test {
use crate::{SourceFile, TreeArc};
fn build_file(literal: &str) -> TreeArc<SourceFile> {
let src = format!(r#"const S: &'static str = "{}";"#, literal);
println!("Source: {}", src);
SourceFile::parse(&src)
}
fn assert_valid_str(literal: &str) {
let file = build_file(literal);
assert!(file.errors().len() == 0, "Errors for literal '{}': {:?}", literal, file.errors());
}
fn assert_invalid_str(literal: &str) {
let file = build_file(literal);
assert!(file.errors().len() > 0);
}
#[test]
fn test_ansi_codepoints() {
for byte in 0..=255u8 {
match byte {
b'\"' | b'\\' => { /* Ignore string close and backslash */ }
_ => assert_valid_str(&(byte as char).to_string()),
}
}
}
#[test]
fn test_unicode_codepoints() {
let valid = ["Ƒ", "バ", "メ", "﷽"];
for c in &valid {
assert_valid_str(c);
}
}
#[test]
fn test_unicode_multiple_codepoints() {
let valid = ["नी", "👨👨"];
for c in &valid {
assert_valid_str(c);
}
}
#[test]
fn test_valid_ascii_escape() {
let valid = [r"\'", r#"\""#, r"\\", r"\n", r"\r", r"\t", r"\0", "a", "b"];
for c in &valid {
assert_valid_str(c);
}
}
#[test]
fn test_invalid_ascii_escape() {
let invalid = [r"\a", r"\?", r"\"];
for c in &invalid {
assert_invalid_str(c);
}
}
#[test]
fn test_valid_ascii_code_escape() {
let valid = [r"\x00", r"\x7F", r"\x55"];
for c in &valid {
assert_valid_str(c);
}
}
#[test]
fn test_invalid_ascii_code_escape() {
let invalid = [r"\x", r"\x7", r"\xF0"];
for c in &invalid {
assert_invalid_str(c);
}
}
#[test]
fn test_valid_unicode_escape() {
let valid = [r"\u{FF}", r"\u{0}", r"\u{F}", r"\u{10FFFF}", r"\u{1_0__FF___FF_____}"];
for c in &valid {
assert_valid_str(c);
}
}
#[test]
fn test_invalid_unicode_escape() {
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_str(c);
}
}
#[test]
fn test_mixed() {
assert_valid_str(
r"This is the tale of a string
with a newline in between, some emoji (👨👨) here and there,
unicode escapes like this: \u{1FFBB} and weird stuff like
this ﷽",
);
}
#[test]
fn test_ignore_newline() {
assert_valid_str(
"Hello \
World",
);
}
}
|
