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use std::cell::RefCell;
use std::collections::HashMap;
use std::env;
use std::fmt;
use std::rc::{Rc, Weak};
use regex::Regex;
use super::functions;
use super::token::{Token, TokenString};
#[derive(Debug, Clone)]
pub(crate) enum MacroSource {
File,
CommandLineOrMakeflags,
Environment,
Builtin,
}
pub(crate) trait LookupInternal: for<'a> Fn(&'a str) -> String {}
impl<F: for<'a> Fn(&'a str) -> String> LookupInternal for F {}
fn lookup_fail(_: &str) -> String {
panic!("internal variables not available!");
}
#[derive(Clone)]
pub(crate) struct MacroSet {
data: HashMap<String, (MacroSource, TokenString)>,
lookup_internal: RefCell<Weak<dyn LookupInternal>>,
}
impl MacroSet {
pub(crate) fn new() -> Self {
let lookup_fail: Rc<dyn LookupInternal> = Rc::new(lookup_fail);
Self {
data: HashMap::new(),
lookup_internal: RefCell::new(Rc::downgrade(&lookup_fail)),
}
}
pub(crate) fn lookup(&self, lookup: Weak<dyn LookupInternal>) {
self.lookup_internal.replace(lookup);
}
pub(crate) fn add_builtins(&mut self) {
for (k, v) in builtins() {
self.data.insert(k.into(), (MacroSource::Builtin, v));
}
}
pub(crate) fn add_env(&mut self) {
for (k, v) in env::vars() {
if k != "MAKEFLAGS" && k != "SHELL" {
self.data
.insert(k, (MacroSource::Environment, TokenString::text(v)));
}
}
}
pub(crate) fn set(&mut self, name: String, source: MacroSource, text: TokenString) {
self.data.insert(name, (source, text));
}
pub(crate) fn is_defined(&self, name: &str) -> bool {
self.data.contains_key(name)
}
pub(crate) fn get(&self, name: &str) -> Option<&(MacroSource, TokenString)> {
self.data.get(name)
}
// `remove` is fine, but I think for "remove-and-return" `pop` is better
pub(crate) fn pop(&mut self, name: &str) -> Option<(MacroSource, TokenString)> {
self.data.remove(name)
}
pub(crate) fn expand(&self, text: &TokenString) -> String {
let mut result = String::new();
for token in text.tokens() {
match token {
Token::Text(t) => result.push_str(t),
Token::MacroExpansion { name, replacement } => {
let internal_macro_names = &['@', '?', '<', '*'][..];
let internal_macro_suffices = &['D', 'F'][..];
let just_internal = name.len() == 1 && name.starts_with(internal_macro_names);
let suffixed_internal = name.len() == 2
&& name.starts_with(internal_macro_names)
&& name.ends_with(internal_macro_suffices);
let macro_value = if just_internal || suffixed_internal {
let lookup_internal = self.lookup_internal.borrow();
let lookup_internal = match lookup_internal.upgrade() {
Some(f) => f,
None => Rc::new(lookup_fail),
};
lookup_internal(name)
} else {
self.data
.get(name)
.map_or_else(String::new, |(_, macro_value)| self.expand(macro_value))
};
let macro_value = match replacement {
Some((subst1, subst2)) => {
let subst1 = self.expand(subst1);
let subst1_suffix = regex::escape(&subst1);
let subst1_suffix =
Regex::new(&format!(r"{}\b", subst1_suffix)).unwrap();
let subst2 = self.expand(subst2);
subst1_suffix.replace_all(¯o_value, subst2).to_string()
}
None => macro_value,
};
result.push_str(¯o_value);
}
Token::FunctionCall { name, args } => {
result.push_str(&functions::call(name, args, &self));
}
}
}
result
}
}
impl fmt::Debug for MacroSet {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:?}", &self.data)
}
}
impl fmt::Display for MacroSet {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let pieces = self
.data
.iter()
.map(|(k, (_, v))| format!("{}={}", k, v))
.collect::<Vec<_>>();
write!(f, "{}", pieces.join("\n"))
}
}
fn builtins() -> Vec<(&'static str, TokenString)> {
// Fuck it, might as well.
macro_rules! handle {
($value:ident) => {
stringify!($value)
};
($value:literal) => {
$value
};
}
macro_rules! make {
($($name:ident=$value:tt)+) => {vec![$(
(stringify!($name), handle!($value).parse().unwrap())
),+]};
}
make![
MAKE=makers
AR=ar
YACC=yacc
YFLAGS=""
LEX=lex
LFLAGS=""
LDFLAGS=""
AS=as
CC=cc
CXX="g++"
CPP="$(CC) -E"
FC=f77
PC=pc
CO=co
GET=get
LINT=lint
MAKEINFO=makeinfo
TEX=tex
TEXI2DVI=texi2dvi
WEAVE=weave
CWEAVE=cweave
TANGLE=tangle
CTANGLE=ctangle
RM="rm -f"
ARFLAGS="rv"
CFLAGS=""
FFLAGS=""
]
}
|
