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|
use super::preprocess::{Error, LinePreProcessor};
use std::{iter::Enumerate, str::Lines};
#[derive(Clone, Debug)]
pub struct PreProcessor<'a> {
lines: Enumerate<Lines<'a>>,
input: String,
line: usize,
offset: usize,
line_pp: LinePreProcessor,
}
impl<'a> PreProcessor<'a> {
pub fn new(input: &'a str) -> Self {
let mut lexer = PreProcessor {
lines: input.lines().enumerate(),
input: "".to_string(),
line: 0,
offset: 0,
line_pp: LinePreProcessor::new(),
};
lexer.next_line();
lexer
}
fn next_line(&mut self) -> bool {
if let Some((line, input)) = self.lines.next() {
let mut input = String::from(input);
while input.ends_with('\\') {
if let Some((_, next)) = self.lines.next() {
input.pop();
input.push_str(next);
} else {
break;
}
}
self.input = input;
self.line = line;
self.offset = 0;
true
} else {
false
}
}
pub fn process(&mut self) -> Result<String, Error> {
let mut res = String::new();
loop {
let line = &self.line_pp.process_line(&self.input)?;
if let Some(line) = line {
res.push_str(line);
}
if !self.next_line() {
break;
}
if line.is_some() {
res.push_str("\n");
}
}
Ok(res)
}
}
#[test]
fn preprocess() {
// line continuation
let mut pp = PreProcessor::new(
"void main my_\
func",
);
assert_eq!(pp.process().unwrap(), "void main my_func");
// preserve #version
let mut pp = PreProcessor::new(
"#version 450 core\n\
void main()",
);
assert_eq!(pp.process().unwrap(), "#version 450 core\nvoid main()");
// simple define
let mut pp = PreProcessor::new(
"#define FOO 42 \n\
fun=FOO",
);
assert_eq!(pp.process().unwrap(), "\nfun=42");
// ifdef with else
let mut pp = PreProcessor::new(
"#define FOO\n\
#ifdef FOO\n\
foo=42\n\
#endif\n\
some=17\n\
#ifdef BAR\n\
bar=88\n\
#else\n\
mm=49\n\
#endif\n\
done=1",
);
assert_eq!(
pp.process().unwrap(),
"\n\
foo=42\n\
\n\
some=17\n\
\n\
mm=49\n\
\n\
done=1"
);
// nested ifdef/ifndef
let mut pp = PreProcessor::new(
"#define FOO\n\
#define BOO\n\
#ifdef FOO\n\
foo=42\n\
#ifdef BOO\n\
boo=44\n\
#endif\n\
ifd=0\n\
#ifndef XYZ\n\
nxyz=8\n\
#endif\n\
#endif\n\
some=17\n\
#ifdef BAR\n\
bar=88\n\
#else\n\
mm=49\n\
#endif\n\
done=1",
);
assert_eq!(
pp.process().unwrap(),
"\n\
foo=42\n\
\n\
boo=44\n\
\n\
ifd=0\n\
\n\
nxyz=8\n\
\n\
some=17\n\
\n\
mm=49\n\
\n\
done=1"
);
// undef
let mut pp = PreProcessor::new(
"#define FOO\n\
#ifdef FOO\n\
foo=42\n\
#endif\n\
some=17\n\
#undef FOO\n\
#ifdef FOO\n\
foo=88\n\
#else\n\
nofoo=66\n\
#endif\n\
done=1",
);
assert_eq!(
pp.process().unwrap(),
"\n\
foo=42\n\
\n\
some=17\n\
\n\
nofoo=66\n\
\n\
done=1"
);
// single-line comment
let mut pp = PreProcessor::new(
"#define FOO 42//1234\n\
fun=FOO",
);
assert_eq!(pp.process().unwrap(), "\nfun=42");
// multi-line comments
let mut pp = PreProcessor::new(
"#define FOO 52/*/1234\n\
#define FOO 88\n\
end of comment*/ /* one more comment */ #define FOO 56\n\
fun=FOO",
);
assert_eq!(pp.process().unwrap(), "\nfun=56");
// unmatched endif
let mut pp = PreProcessor::new(
"#ifdef FOO\n\
foo=42\n\
#endif\n\
#endif",
);
assert_eq!(pp.process(), Err(Error::UnmatchedEndif));
// unmatched else
let mut pp = PreProcessor::new(
"#ifdef FOO\n\
foo=42\n\
#else\n\
bar=88\n\
#else\n\
bad=true\n\
#endif",
);
assert_eq!(pp.process(), Err(Error::UnmatchedElse));
}
|
