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|
use crate::*;
use std::path::PathBuf;
pub fn parse_syntactic<P: Into<PathBuf>>(source_code: &str, path: Option<P>) -> Result<Vec<Tracked<SyntacticToken>>, Vec<Tracked<SyntacticError>>> {
parse_syntactic_from_tokeniser(Tokeniser::new(source_code, path))
}
fn parse_syntactic_from_tokeniser(mut t: Tokeniser) -> Result<Vec<Tracked<SyntacticToken>>, Vec<Tracked<SyntacticError>>> {
t.add_delimiters(&['@','&','%',';','{','}','(',')','[',']','#','~','"','\'']);
t.add_terminators(&[':']);
let mut tokens = Vec::new();
let mut errors = Vec::new();
let mut label_name = String::new();
macro_rules! err {
($error:expr) => {{
err!($error, t.get_source());
}};
($error:expr, $source:expr) => {{
errors.push(Tracked::from($error, $source));
continue;
}};
}
macro_rules! is_any {
($close:expr) => {
|t: &mut Tokeniser| { t.eat_char() == Some($close) }
};
}
loop {
t.eat_whitespace();
t.mark_start();
let Some(c) = t.eat_char() else { break };
let token = match c {
'"' => {
let source = t.get_source();
match t.track_until(is_any!('"')) {
Some(string) => {
let mut bytes = string.into_bytes();
bytes.push(0x00);
SyntacticToken::String(bytes)
}
None => err!(SyntacticError::UnterminatedNullString, source),
}
}
'\'' => {
let source = t.get_source();
match t.track_until(is_any!('\'')) {
Some(string) => SyntacticToken::String(string.into_bytes()),
None => err!(SyntacticError::UnterminatedRawString, source),
}
}
'(' => {
let source = t.get_source();
if let Some(string) = t.track_until(is_any!(')')) {
// Check if the comment fills the entire line.
if t.start.position.column == 0 && t.end_of_line() {
if let Some(path) = string.strip_prefix(": ") {
t.embedded_path = Some(PathBuf::from(path.trim()));
t.embedded_first_line = t.start.position.line + 1;
continue;
}
}
SyntacticToken::Comment(string)
} else {
err!(SyntacticError::UnterminatedComment, source)
}
}
'%' => {
let name = t.eat_token();
let source = t.get_source();
t.mark_child();
if let Some(_) = t.track_until(is_any!(';')) {
let child = t.tokenise_child_span();
match parse_body_from_tokeniser(child) {
Ok(body) => {
let name = Tracked::from(name, source);
let definition = SyntacticMacroDefinition { name, body };
SyntacticToken::MacroDefinition(definition)
}
Err(mut err) => {
errors.append(&mut err);
continue;
}
}
} else {
err!(SyntacticError::UnterminatedMacroDefinition, source);
}
}
'{' => SyntacticToken::BlockOpen,
'}' => SyntacticToken::BlockClose,
'[' => continue,
']' => continue,
')' => err!(SyntacticError::UnmatchedCommentTerminator),
';' => err!(SyntacticError::UnmatchedMacroTerminator),
'@' => {
label_name = t.eat_token();
SyntacticToken::LabelDefinition(label_name.clone())
}
'&' => {
let name = t.eat_token();
SyntacticToken::LabelDefinition(format!("{label_name}/{name}"))
}
'~' => {
let name = t.eat_token();
SyntacticToken::Invocation(format!("{label_name}/{name}"))
}
'#' => {
let token = t.eat_token();
match token.parse::<Value>() {
Ok(value) => SyntacticToken::Padding(value),
Err(_) => err!(SyntacticError::InvalidPaddingValue),
}
},
c => {
let token = format!("{c}{}", t.eat_token());
if let Ok(value) = token.parse::<Value>() {
SyntacticToken::RawValue(value)
} else if let Ok(instruction) = token.parse::<Instruction>() {
SyntacticToken::Instruction(instruction)
} else {
SyntacticToken::Invocation(token)
}
}
};
t.mark_end();
let source = t.get_source();
tokens.push(Tracked::from(token, source));
}
// Check that every block open matches a block close.
let mut stack = Vec::new();
for token in &tokens {
match &token.value {
SyntacticToken::BlockOpen => stack.push(token.source.clone()),
SyntacticToken::BlockClose => if let None = stack.pop() {
let error = SyntacticError::UnmatchedBlockTerminator;
errors.push(Tracked::from(error, token.source.clone()));
}
_ => (),
}
}
for source in stack {
let error = SyntacticError::UnterminatedBlock;
errors.push(Tracked::from(error, source));
}
match errors.is_empty() {
true => Ok(tokens),
false => Err(errors),
}
}
fn parse_body_from_tokeniser(t: Tokeniser) -> Result<Vec<Tracked<SyntacticToken>>, Vec<Tracked<SyntacticError>>> {
let mut tokens = Vec::new();
let mut errors = Vec::new();
for token in parse_syntactic_from_tokeniser(t)? {
match token.value {
SyntacticToken::LabelDefinition(_) => {
let error = SyntacticError::LabelDefinitionInMacroDefinition;
errors.push(Tracked::from(error, token.source));
continue;
}
SyntacticToken::MacroDefinition(_) => {
let error = SyntacticError::MacroDefinitionInMacroDefinition;
errors.push(Tracked::from(error, token.source));
continue;
}
_ => tokens.push(token),
};
}
match errors.is_empty() {
true => Ok(tokens),
false => Err(errors),
}
}
|
