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|
use std::collections::HashMap;
use std::env;
use std::fmt;
use anyhow::Context;
use regex::Regex;
use super::functions;
use super::token::{Token, TokenString};
#[derive(Debug, Clone)]
pub enum Source {
File,
CommandLineOrMakeflags,
Environment,
Builtin,
}
pub trait LookupInternal: for<'a> Fn(&'a str) -> anyhow::Result<String> {}
impl<F: for<'a> Fn(&'a str) -> anyhow::Result<String>> LookupInternal for F {}
#[derive(Clone)]
pub struct Set<'parent, 'lookup> {
parent: Option<&'parent Set<'parent, 'lookup>>,
data: HashMap<String, (Source, TokenString)>,
lookup_internal: Option<&'lookup dyn LookupInternal>,
}
impl<'parent, 'lookup> Set<'parent, 'lookup> {
pub fn new() -> Self {
Self {
parent: None,
data: HashMap::new(),
lookup_internal: None,
}
}
pub fn add_builtins(&mut self) {
for (k, v) in builtins() {
self.data.insert(k.into(), (Source::Builtin, v));
}
}
pub fn add_env(&mut self) {
for (k, v) in env::vars() {
if k != "MAKEFLAGS" && k != "SHELL" {
self.data
.insert(k, (Source::Environment, TokenString::text(v)));
}
}
}
fn lookup_internal(&self, name: &str) -> anyhow::Result<String> {
if let Some(lookup) = self.lookup_internal {
lookup(name)
} else if let Some(parent) = self.parent {
parent.lookup_internal(name)
} else {
anyhow::bail!("no lookup possible")
}
}
pub fn get(&self, name: &str) -> Option<&(Source, TokenString)> {
self.data
.get(name)
.or_else(|| self.parent.and_then(|parent| parent.get(name)))
}
pub fn set(&mut self, name: String, source: Source, text: TokenString) {
self.data.insert(name, (source, text));
}
pub fn is_defined(&self, name: &str) -> bool {
self.data.contains_key(name)
}
// `remove` is fine, but I think for "remove-and-return" `pop` is better
pub fn pop(&mut self, name: &str) -> Option<(Source, TokenString)> {
self.data.remove(name)
}
pub fn expand(&self, text: &TokenString) -> anyhow::Result<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 {
self.lookup_internal(name)?
} else {
self.get(name).map_or_else(
|| Ok(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))
.context("formed invalid regex somehow")?;
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::expand_call(name, args, self)?);
}
}
}
Ok(result)
}
pub fn with_lookup<'l, 's: 'l>(&'s self, lookup: &'l dyn LookupInternal) -> Set<'s, 'l> {
Set {
parent: Some(self),
data: HashMap::new(),
lookup_internal: Some(lookup),
}
}
pub fn with_overlay<'s>(&'s self) -> Set<'s, 'lookup> {
Set {
parent: Some(self),
data: HashMap::new(),
lookup_internal: None,
}
}
}
impl fmt::Display for Set<'_, '_> {
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=""
]
}
|
