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// Heredoc scanner for shell-like languages
use crate::external_scanner::{ExternalScanner, Lexer, ScanResult};
/// Scanner for heredoc strings in shell-like languages
#[derive(Debug, Clone, Default)]
pub struct HeredocScanner {
delimiter: Vec<u8>,
in_heredoc: bool,
}
impl HeredocScanner {
pub fn new() -> Self {
HeredocScanner {
delimiter: Vec::new(),
in_heredoc: false,
}
}
}
impl ExternalScanner for HeredocScanner {
fn scan(&mut self, lexer: &mut dyn Lexer, valid_symbols: &[bool]) -> Option<ScanResult> {
const HEREDOC_START: usize = 0;
const HEREDOC_BODY: usize = 1;
const HEREDOC_END: usize = 2;
if lexer.is_eof() {
return None;
}
if !self.in_heredoc {
// Look for heredoc start (<<DELIMITER)
if valid_symbols.get(HEREDOC_START) == Some(&true) {
// Check for <<
if lexer.lookahead() == Some(b'<') {
lexer.advance(1);
if lexer.lookahead() == Some(b'<') {
lexer.advance(1);
// Skip optional whitespace
while lexer.lookahead() == Some(b' ') || lexer.lookahead() == Some(b'\t') {
lexer.advance(1);
}
// Read delimiter
self.delimiter.clear();
while !lexer.is_eof() {
if let Some(ch) = lexer.lookahead() {
if ch == b'\n' || ch == b' ' || ch == b'\t' {
break;
}
self.delimiter.push(ch);
lexer.advance(1);
} else {
break;
}
}
if !self.delimiter.is_empty() {
self.in_heredoc = true;
lexer.mark_end();
return Some(ScanResult {
symbol: HEREDOC_START as u16,
length: 2 + self.delimiter.len(),
});
}
}
}
}
} else {
// Inside heredoc - look for delimiter or body
if valid_symbols.get(HEREDOC_END) == Some(&true) {
// Check if current line starts with delimiter
if lexer.column() == 0 {
let mut matches = true;
let mut temp_pos = 0;
for &expected in &self.delimiter {
if lexer.lookahead() != Some(expected) {
matches = false;
break;
}
lexer.advance(1);
temp_pos += 1;
}
if matches && (lexer.lookahead() == Some(b'\n') || lexer.is_eof()) {
self.in_heredoc = false;
self.delimiter.clear();
lexer.mark_end();
return Some(ScanResult {
symbol: HEREDOC_END as u16,
length: temp_pos,
});
}
// Rewind if not a match
// Note: This is simplified - proper implementation would need better lookahead
}
}
if valid_symbols.get(HEREDOC_BODY) == Some(&true) {
// Consume heredoc body until end of line
let mut length = 0;
while !lexer.is_eof() && lexer.lookahead() != Some(b'\n') {
lexer.advance(1);
length += 1;
}
if lexer.lookahead() == Some(b'\n') {
lexer.advance(1);
length += 1;
}
if length > 0 {
lexer.mark_end();
return Some(ScanResult {
symbol: HEREDOC_BODY as u16,
length,
});
}
}
}
None
}
fn serialize(&self, buffer: &mut Vec<u8>) {
// Serialize delimiter length and content
buffer.extend_from_slice(&(self.delimiter.len() as u16).to_le_bytes());
buffer.extend_from_slice(&self.delimiter);
// Serialize state
buffer.push(if self.in_heredoc { 1 } else { 0 });
}
fn deserialize(&mut self, buffer: &[u8]) {
if buffer.len() < 2 {
return;
}
// Deserialize delimiter
let delimiter_len = u16::from_le_bytes([buffer[0], buffer[1]]) as usize;
self.delimiter.clear();
let offset = 2;
if offset + delimiter_len <= buffer.len() {
self.delimiter
.extend_from_slice(&buffer[offset..offset + delimiter_len]);
}
// Deserialize state
let state_offset = offset + delimiter_len;
if state_offset < buffer.len() {
self.in_heredoc = buffer[state_offset] != 0;
}
}
}