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use std::collections::HashMap;
use std::fs;
// print only with debug_assertions
macro_rules! dprint {
($($x:tt)*) => {
#[cfg(debug_assertions)]
print!($($x)*)
}
}
// // println only with debug_assertions
// macro_rules! dprintln {
// ($($x:tt)*) => {
// #[cfg(debug_assertions)]
// println!($($x)*)
// }
// }
// Point to one or more ranges of a string, useful for highlighting parts of string
macro_rules! highlight_debug {
($hi_col:expr, $str:expr $(, ($pos:tt -> $endpos:tt))*) => {
for (i, _c) in $str.char_indices() {
if false $(|| (i >= $pos) && (i < $endpos))* {
dprint!("{}{}\x1b[0m", $hi_col, _c);
} else {
dprint!("{}", _c);
}
}
dprint!("\n");
};
($str:expr, $pos:expr, $endpos:expr) => {
highlight_debug!("\x1b[7m", $str, ($pos -> $endpos))
};
($str:expr, $pos:expr) => {
highlight_debug!($str, $pos, $pos+1)
};
}
#[derive(Debug)]
pub struct MacroProcessor {
macros: HashMap<String, String>,
}
impl MacroProcessor {
pub fn new() -> Self {
Self {
macros: HashMap::new(),
}
}
pub fn define_macro(&mut self, name: String, body: String) {
self.macros.insert(name, body);
}
/// This expands a macro definition, and it executes builtin functions, like define
/// Currently, you cannot overwrite builtin's.
/// This is partly by design, and I don't currently see why I would want that.
/// In the future, this may change
///
/// (The HashMap might become a HashMap<String, Box<dyn FnMut>> or something similar.
/// Then, all builtins would also be functions, and "normal" macros, would simply
/// be closures returning the string)
fn expand_macro(&mut self, macro_name: &str, args: &mut [String]) -> String {
if macro_name == "define" {
if args.len() < 1 {
println!("Missing argument(s) to `define`, found {} but expected 1 or 2", args.len());
return String::new();
}
let arg0 = self.process_input(&args[0]);
if args.len() > 1 {
let arg1 = self.process_input(&args[1]);
self.define_macro(arg0, arg1);
} else {
self.define_macro(arg0, String::new());
}
return String::new();
}
if macro_name == "ifdef" {
if args.len() < 2 {
println!("Missing argument(s) to `ifdef`, found {} but expected 2 or 3", args.len());
return String::new();
}
// We need to expand the first argument here as well, but we need to make the parser
// support literal, and phrase strings
if self.macros.contains_key(&args[0]) {
return self.process_input(&args[1]);
}
if args.len() > 2 {
return self.process_input(&args[2]);
}
return String::new();
}
if macro_name == "ifndef" {
if args.len() < 2 {
println!("Missing argument(s) to `ifndef`, found {} but expected 2 or 3", args.len());
return String::new();
}
// We need to expand the first argument here as well, but we need to make the parser
// support literal, and phrase strings
if !self.macros.contains_key(&args[0]) {
return self.process_input(&args[1]);
}
if args.len() > 2 {
return self.process_input(&args[2]);
}
return String::new();
}
if macro_name == "ifeq" {
if args.len() < 3 {
println!("Missing argument(s) to `ifeq`, found {} but expected 3 or 4", args.len());
return String::new();
}
let arg0 = self.process_input(&args[0]);
let arg1 = self.process_input(&args[1]);
if arg0 == arg1 {
return self.process_input(&args[2]);
}
if args.len() > 3 {
return self.process_input(&args[3]);
}
return String::new();
}
if macro_name == "ifneq" {
if args.len() < 3 {
println!("Missing argument(s) to `ifneq`, found {} but expected 3 or 4", args.len());
return String::new();
}
let arg0 = self.process_input(&args[0]);
let arg1 = self.process_input(&args[1]);
if arg0 != arg1 {
return self.process_input(&args[2]);
}
if args.len() > 3 {
return self.process_input(&args[3]);
}
return String::new();
}
if macro_name == "include" {
if args.len() < 1 {
println!("Missing argument(s) to `include`, found {} but expected 1", args.len());
return String::new();
}
let arg0 = self.process_input(&args[0]);
let input_file = fs::read_to_string(&arg0).expect("Failed to read input file");
return self.process_input(&input_file);
}
//Expand macro name? somwhat unsure on how to do this safely
//let macro_name = self.process_input(macro_name);
let Some(macro_body) = self.macros.get(macro_name) else {
return format!("{}", macro_name);
};
let mut expanded = macro_body.clone();
for (i, arg) in args.iter().enumerate() {
let placeholder = format!("${}", i + 1);
expanded = expanded.replace(&placeholder, arg);
}
expanded
}
pub fn process_input(&mut self, input: &str) -> String {
let mut output = String::new();
let mut state = ParserState::Normal;
let mut state_previous = ParserState::Normal;
let mut macro_name = String::new();
let mut macro_args = Vec::new();
let mut argument = String::new();
let mut macro_name_start = 0;
let mut skip_next_line_ending = false;
let mut in_quote_single = false;
let mut in_quote_double = false;
for (i, c) in input.char_indices() {
highlight_debug!(input, macro_name_start, i);
match state {
ParserState::Normal => {
macro_name_start = i;
if skip_next_line_ending && (c == '\n') {
skip_next_line_ending = false;
continue;
}
if c.is_alphanumeric() {
state = ParserState::InMacro;
state_previous = ParserState::Normal;
macro_name.push(c);
} else {
output.push(c);
}
}
ParserState::InMacro => {
if c.is_alphanumeric() || c == '_' {
macro_name.push(c);
} else if c == '(' {
state = ParserState::InMacroArgs;
state_previous = ParserState::InMacro;
} else {
if self.macros.contains_key(¯o_name) {
highlight_debug!("\x1b[32m\x1b[7m", input, (macro_name_start -> i));
}
if macro_name == "DNL" {
skip_next_line_ending = c != '\n';
} else {
let expanded = self.expand_macro(¯o_name, &mut []);
output.push_str(&expanded);
output.push(c);
}
macro_name.clear();
state = ParserState::Normal;
state_previous = ParserState::InMacro;
}
}
ParserState::InMacroArgs => {
if c == ')' {
highlight_debug!("\x1b[32m\x1b[7m", input, (macro_name_start -> i));
macro_args.push(argument.trim().to_string());
let expanded = self.expand_macro(¯o_name, &mut macro_args);
output.push_str(&expanded);
state = ParserState::Normal;
state_previous = ParserState::InMacroArgs;
macro_name.clear();
macro_args.clear();
argument.clear();
} else if c == ',' {
macro_args.push(argument.trim().to_string());
argument.clear();
} else {
argument.push(c);
}
}
}
}
// Handle cases where the text ends with a macro without arguments
if !macro_name.is_empty() {
output.push_str(&self.expand_macro(¯o_name, &mut []));
}
output
}
}
#[derive(Debug, PartialEq)]
enum ParserState {
Normal,
InMacro,
InMacroArgs,
}
|
