1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
#[cfg(feature = "full")]
use std::cell::RefCell;
use std::collections::HashMap;
use std::env;
use std::fmt;
#[cfg(feature = "full")]
use std::rc::Rc;
use eyre::{bail, Result, WrapErr};
use regex::Regex;
#[cfg(feature = "full")]
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) -> Result<String> {}
impl<F: for<'a> Fn(&'a str) -> Result<String>> LookupInternal for F {}
#[derive(Clone)]
pub struct Set<'parent, 'lookup> {
parent: Option<&'parent Set<'parent, 'lookup>>,
pub data: HashMap<String, (Source, TokenString)>,
lookup_internal: Option<&'lookup dyn LookupInternal>,
#[cfg(feature = "full")]
pub to_eval: Rc<RefCell<Vec<String>>>,
}
impl<'parent, 'lookup> Set<'parent, 'lookup> {
pub fn new() -> Self {
Self {
parent: None,
data: HashMap::new(),
lookup_internal: None,
#[cfg(feature = "full")]
to_eval: Rc::new(RefCell::new(Vec::new())),
}
}
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) -> Result<String> {
if let Some(lookup) = self.lookup_internal {
lookup(name)
} else if let Some(parent) = self.parent {
parent.lookup_internal(name)
} else {
bail!(
"tried to lookup {:?} but no lookup function is available",
name
)
}
}
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));
}
#[cfg(feature = "full")]
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 extend(&mut self, other: HashMap<String, (Source, TokenString)>) {
self.data.extend(other);
}
pub fn expand(&self, text: &TokenString) -> 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);
}
#[cfg(feature = "full")]
Token::FunctionCall { name, args } => {
result.push_str(&functions::expand_call(
name,
args,
self,
Some(Rc::clone(&self.to_eval)),
)?);
}
}
}
Ok(result)
}
#[cfg(feature = "full")]
pub fn origin(&self, name: &str) -> &'static str {
match self.data.get(name) {
None => self.parent.map_or("undefined", |p| p.origin(name)),
Some((Source::Builtin, _)) => "default",
Some((Source::Environment, _)) => "environment",
// TODO figure out when to return "environment override"
Some((Source::File, _)) => "file",
Some((Source::CommandLineOrMakeflags, _)) => "command line",
// TODO handle override and automatic
}
}
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),
#[cfg(feature = "full")]
to_eval: Default::default(),
}
}
#[cfg(feature = "full")]
pub fn with_overlay<'s>(&'s self) -> Set<'s, 'lookup> {
Set {
parent: Some(self),
data: HashMap::new(),
lookup_internal: None,
#[cfg(feature = "full")]
to_eval: Default::default(),
}
}
}
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=""
]
}
|
