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use std::collections::VecDeque;
use crate::grammars::generated::macrointconstantexpressionastparser;
use crate::grammars::macrointconstantexpressionast::{PreTokenIf, VisitorEvaluator};
use crate::preprocessor::multilexer::MultiLexer;
use crate::preprocessor::pretoken::PreToken;
use crate::utils::antlrlexerwrapper::AntlrLexerWrapper;
use crate::utils::structs::{CompileError, CompileMsg, FilePreTokPos, PreTokPos};
use crate::{filePreTokPosMatchArm, filePreTokPosMatches};
use antlr_rust::common_token_stream::CommonTokenStream;
use super::Preprocessor;
impl Preprocessor {
fn getDefinedName(
lexer: &mut MultiLexer,
definedToken: &FilePreTokPos<PreToken>,
) -> Result<String, CompileMsg> {
let mut name = String::new();
// Skip whitespace. Push back the meta tokens. When we get the first open paren, wait.
let mut metaToks = vec![];
let openParenTok: FilePreTokPos<PreToken> = loop {
if let Some(tok) = lexer.next() {
match tok.tokPos.tok {
PreToken::Whitespace(_) => {}
PreToken::Ident(id) => {
// Shortcut! :D
return Ok(id);
}
PreToken::ValidNop | PreToken::EnableMacro(_) | PreToken::DisableMacro(_) => {
metaToks.push(tok);
}
PreToken::Newline => {
lexer.pushToken(tok.clone());
return Err(CompileError::from_preTo(
"Expected identifier after the defined. Instead, found a newline"
.to_string(),
definedToken,
));
}
PreToken::OperatorPunctuator("(") => {
break tok;
}
_ => {
return Err(CompileError::from_preTo(
format!(
"Expected identifier after the defined. Instead, found: {}",
tok.tokPos.tok.to_str()
),
definedToken,
));
}
}
} else {
return Err(CompileError::from_preTo(
"Expected identifier after the defined. Instead, found EOF",
definedToken,
));
}
};
// Capture everything until the next matching close paren
let mut openParens: usize = 0;
let mut tokies: Vec<FilePreTokPos<PreToken>> = vec![];
loop {
let tok = lexer.next();
match (openParens, &tok) {
(_, Some(filePreTokPosMatchArm!(PreToken::Newline)) | None) => {
if let Some(tok) = tok {
lexer.pushToken(tok);
}
return Err(CompileError::from_preTo(
"Expected matching closing paren for this opening paren",
&openParenTok,
));
}
(0, Some(filePreTokPosMatchArm!(PreToken::OperatorPunctuator(")")))) => {
break;
}
(_, Some(filePreTokPosMatchArm!(PreToken::OperatorPunctuator(")")))) => {
tokies.push(tok.unwrap());
openParens -= 1;
}
(_, Some(filePreTokPosMatchArm!(PreToken::OperatorPunctuator("(")))) => {
tokies.push(tok.unwrap());
openParens += 1;
}
_ => {
tokies.push(tok.unwrap());
}
};
}
// Cleaning all whitespace things, and then looking at first element for a name
if let Some(tok) = tokies
.iter()
.filter(|x| {
!filePreTokPosMatches!(
x,
PreToken::Whitespace(_)
| PreToken::EnableMacro(_)
| PreToken::DisableMacro(_)
| PreToken::ValidNop
)
})
.take(1)
.filter(|x| filePreTokPosMatches!(x, PreToken::Ident(_)))
.map(|x| x.tokPos.tok.to_str())
.into_iter()
.next()
{
name = tok.to_string();
}
if name.is_empty() {
Err(CompileError::from_preTo(
"Expected identifier after defined",
definedToken,
))
} else {
Ok(name)
}
}
pub fn consumeMacroExpr(&mut self) -> Result<VecDeque<FilePreTokPos<PreToken>>, CompileMsg> {
let mut paramDisabledMacros = self.disabledMacros.clone();
paramDisabledMacros.remove(&"__has_include".to_owned());
paramDisabledMacros.remove(&"__has_cpp_attribute".to_owned());
let mut preproTokie = VecDeque::new();
while let Some(tok) = self.multilexer.next() {
match &tok {
filePreTokPosMatchArm!(PreToken::Newline) => {
break;
}
filePreTokPosMatchArm!(PreToken::EnableMacro(nameMacro)) => {
paramDisabledMacros.remove(nameMacro);
preproTokie.push_back(tok.clone());
}
filePreTokPosMatchArm!(PreToken::DisableMacro(nameMacro)) => {
paramDisabledMacros.insert(nameMacro.clone());
preproTokie.push_back(tok.clone());
}
filePreTokPosMatchArm!(PreToken::Ident(name)) => {
if name == "defined" {
let nameDefined = Self::getDefinedName(&mut self.multilexer, &tok);
match nameDefined {
Ok(nameDefined) => {
preproTokie.push_back(FilePreTokPos::new_meta_c(
PreToken::PPNumber(
if self.definitions.contains_key(&nameDefined) {
"1"
} else {
"0"
}
.to_owned(),
),
&tok,
));
}
Err(err) => {
self.reachNl();
return Err(err);
}
}
} else {
let toks = Self::macroExpandInternal(
&self.definitions,
¶mDisabledMacros,
&mut self.multilexer,
tok,
);
match toks {
Ok(toks) => {
preproTokie.extend(toks);
}
Err(err) => {
self.reachNl();
return Err(err);
}
}
}
}
_ => {
preproTokie.push_back(tok);
}
}
}
Ok(preproTokie
.into_iter()
.filter(|x| {
!filePreTokPosMatches!(
x,
PreToken::ValidNop
| PreToken::EnableMacro(_)
| PreToken::DisableMacro(_)
| PreToken::Whitespace(_)
| PreToken::Newline
)
})
.filter_map(|x| match x {
filePreTokPosMatchArm!(
PreToken::ValidNop
| PreToken::EnableMacro(_)
| PreToken::DisableMacro(_)
| PreToken::Whitespace(_)
| PreToken::Newline
) => None,
filePreTokPosMatchArm!(PreToken::CharLiteral(ref char)) => {
// TODO: THIS IS NOT CORRECT. We need to evaluate the escape sequences! I'm ignoring this for now
let mut chars = char.chars();
chars.next();
let mut buffer = [0; 4];
chars.next().unwrap_or('\0').encode_utf8(&mut buffer);
Some(FilePreTokPos::new_meta_c(
PreToken::PPNumber(buffer[0].to_string()),
&x,
))
}
filePreTokPosMatchArm!(PreToken::Keyword(key)) if key == "true" => Some(
FilePreTokPos::new_meta_c(PreToken::PPNumber("1".to_owned()), &x),
),
filePreTokPosMatchArm!(PreToken::Keyword(_) | PreToken::Ident(_)) => Some(
FilePreTokPos::new_meta_c(PreToken::PPNumber("0".to_owned()), &x),
),
_ => Some(x),
})
.collect())
}
fn transformToParserTokens(
sequence: &VecDeque<FilePreTokPos<PreToken>>,
token: &FilePreTokPos<PreToken>,
) -> Result<VecDeque<FilePreTokPos<PreTokenIf>>, Vec<CompileMsg>> {
let mut errors = vec![];
for invalid in sequence.iter().filter(|x| {
!filePreTokPosMatches!(x, PreToken::PPNumber(_) | PreToken::OperatorPunctuator(_))
|| filePreTokPosMatches!(
x,
PreToken::OperatorPunctuator(
r"{" | r"}"
| r"["
| r"]"
| r"<:"
| r":>"
| r"<%"
| r"%>"
| r";"
| r"..."
| r"::"
| r"."
| r".*"
| r"->"
| r"->*"
| r"="
| r"+="
| r"-="
| r"*="
| r"/="
| r"%="
| r"^="
| r"&="
| r"|="
| r"<<="
| r">>="
| r"and_eq"
| r"or_eq"
| r"xor_eq"
| r"not_eq"
)
)
}) {
errors.push(CompileError::from_preTo(
format!(
"Invalid token in if eval scope: {}",
invalid.tokPos.tok.to_str()
),
invalid,
));
}
// TODO: THIS IS NOT CORRECT. We should evaluate the pretocens to full tokens, but I'll wait for the lexer to be done
let mut intconstantValues: VecDeque<FilePreTokPos<_>> = VecDeque::new();
for token in sequence {
match token {
filePreTokPosMatchArm!(PreToken::PPNumber(ref num)) => {
let mut numClone = num.clone();
numClone.retain(char::is_numeric);
match numClone.parse::<i128>() {
Ok(num) => {
intconstantValues
.push_back(FilePreTokPos::new_meta_c(PreTokenIf::Num(num), token));
}
Err(err) => errors.push(CompileError::from_preTo(
format!("Invalid number in if eval scope: {}", err),
token,
)),
}
}
filePreTokPosMatchArm!(PreToken::OperatorPunctuator(s)) => {
intconstantValues.push_back(FilePreTokPos::new_meta_c(
PreTokenIf::stringToPreTokenIfOperator(s),
token,
));
}
_ => {}
}
}
if !errors.is_empty() {
return Err(errors);
}
if intconstantValues.front().is_none() {
return Err(vec![CompileError::from_preTo(
"Missing data for integer constant evaluation",
token,
)]);
}
return Ok(intconstantValues);
}
pub fn evalIfScope(
sequence: VecDeque<FilePreTokPos<PreToken>>,
token: &FilePreTokPos<PreToken>,
) -> Result<bool, Vec<CompileMsg>> {
let numSequence = Self::transformToParserTokens(&sequence, token)?;
let tokenStream = CommonTokenStream::new(AntlrLexerWrapper::new(
numSequence,
token.file.path().clone(),
));
let mut basicParser =
macrointconstantexpressionastparser::macrointconstantexpressionast::new(tokenStream);
let tree = basicParser.exprRes().unwrap();
let mut visitor = VisitorEvaluator::new();
visitor.visit_start(&tree);
return Ok(visitor.res() != 0);
}
}