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use proc_macro2::{Ident, Span};
use syn::{spanned::Spanned, LitByteStr, LitStr};
use crate::error::{Errors, Result};
use crate::leaf::Callback;
use crate::mir::Mir;
use crate::parser::nested::NestedValue;
use crate::parser::{IgnoreFlags, Parser, Subpatterns};
use super::ignore_flags::ascii_case::MakeAsciiCaseInsensitive;
pub struct Definition {
pub literal: Literal,
pub priority: Option<usize>,
pub callback: Option<Callback>,
pub ignore_flags: IgnoreFlags,
}
pub enum Literal {
Utf8(LitStr),
Bytes(LitByteStr),
}
impl Definition {
pub fn new(literal: Literal) -> Self {
Definition {
literal,
priority: None,
callback: None,
ignore_flags: IgnoreFlags::Empty,
}
}
pub fn named_attr(&mut self, name: Ident, value: NestedValue, parser: &mut Parser) {
match (name.to_string().as_str(), value) {
("priority", NestedValue::Assign(tokens)) => {
let prio = match tokens.to_string().parse() {
Ok(prio) => prio,
Err(_) => {
parser.err("Expected an unsigned integer", tokens.span());
return;
}
};
if self.priority.replace(prio).is_some() {
parser.err("Resetting previously set priority", tokens.span());
}
}
("priority", _) => {
parser.err("Expected: priority = <integer>", name.span());
}
("callback", NestedValue::Assign(tokens)) => {
let span = tokens.span();
let callback = match parser.parse_callback(tokens) {
Some(callback) => callback,
None => {
parser.err("Not a valid callback", span);
return;
}
};
if let Some(previous) = self.callback.replace(callback) {
parser
.err(
"Callback has been already set",
span.join(name.span()).unwrap(),
)
.err("Previous callback set here", previous.span());
}
}
("callback", _) => {
parser.err("Expected: callback = ...", name.span());
}
("ignore", NestedValue::Group(tokens)) => {
self.ignore_flags.parse_group(name, tokens, parser);
}
("ignore", _) => {
parser.err("Expected: ignore(<flag>, ...)", name.span());
}
(unknown, _) => {
parser.err(
format!(
"\
Unknown nested attribute: {}\n\
\n\
Expected one of: priority, callback\
",
unknown
),
name.span(),
);
}
}
}
}
impl Literal {
pub fn to_bytes(&self) -> Vec<u8> {
match self {
Literal::Utf8(string) => string.value().into_bytes(),
Literal::Bytes(bytes) => bytes.value(),
}
}
pub fn escape_regex(&self) -> Literal {
match self {
Literal::Utf8(string) => Literal::Utf8(LitStr::new(
regex_syntax::escape(&string.value()).as_str(),
self.span(),
)),
Literal::Bytes(bytes) => Literal::Bytes(LitByteStr::new(
regex_syntax::escape(&bytes_to_regex_string(bytes.value())).as_bytes(),
self.span(),
)),
}
}
pub fn to_mir(
&self,
subpatterns: &Subpatterns,
ignore_flags: IgnoreFlags,
errors: &mut Errors,
) -> Result<Mir> {
let value = subpatterns.fix(self, errors);
if ignore_flags.contains(IgnoreFlags::IgnoreAsciiCase) {
match self {
Literal::Utf8(_) => {
Mir::utf8(&value).map(MakeAsciiCaseInsensitive::make_ascii_case_insensitive)
}
Literal::Bytes(_) => Mir::binary_ignore_case(&value),
}
} else if ignore_flags.contains(IgnoreFlags::IgnoreCase) {
match self {
Literal::Utf8(_) => Mir::utf8_ignore_case(&value),
Literal::Bytes(_) => Mir::binary_ignore_case(&value),
}
} else {
match self {
Literal::Utf8(_) => Mir::utf8(&value),
Literal::Bytes(_) => Mir::binary(&value),
}
}
}
pub fn span(&self) -> Span {
match self {
Literal::Utf8(string) => string.span(),
Literal::Bytes(bytes) => bytes.span(),
}
}
}
impl syn::parse::Parse for Literal {
fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
let la = input.lookahead1();
if la.peek(LitStr) {
Ok(Literal::Utf8(input.parse()?))
} else if la.peek(LitByteStr) {
Ok(Literal::Bytes(input.parse()?))
} else {
Err(la.error())
}
}
}
pub fn bytes_to_regex_string(bytes: Vec<u8>) -> String {
if bytes.is_ascii() {
unsafe {
return String::from_utf8_unchecked(bytes);
}
}
let mut string = String::with_capacity(bytes.len() * 2);
for byte in bytes {
if byte < 0x80 {
string.push(byte as char);
} else {
static DIGITS: [u8; 16] = *b"0123456789abcdef";
string.push_str(r"\x");
string.push(DIGITS[(byte / 16) as usize] as char);
string.push(DIGITS[(byte % 16) as usize] as char);
}
}
string
}