309 lines
8.1 KiB
Rust
309 lines
8.1 KiB
Rust
use std::fmt::Write;
|
|
use std::str;
|
|
|
|
pub const DEFAULT_WIDTH: usize = 80;
|
|
|
|
pub trait Emittable: std::fmt::Debug {
|
|
fn write_on(&self, f: &mut Formatter);
|
|
}
|
|
|
|
pub type Item = std::rc::Rc<dyn Emittable>;
|
|
|
|
#[derive(Clone)]
|
|
pub struct Sequence {
|
|
pub items: Vec<Item>,
|
|
pub separator: &'static str,
|
|
pub terminator: &'static str,
|
|
}
|
|
|
|
#[derive(Clone)]
|
|
pub struct Grouping {
|
|
pub sequence: Sequence,
|
|
pub open: &'static str,
|
|
pub close: &'static str,
|
|
}
|
|
|
|
pub struct Formatter {
|
|
pub width: usize,
|
|
indent_delta: String,
|
|
current_indent: String,
|
|
pub buffer: String,
|
|
}
|
|
|
|
impl Formatter {
|
|
pub fn new() -> Self {
|
|
Formatter {
|
|
width: DEFAULT_WIDTH,
|
|
indent_delta: " ".to_owned(),
|
|
current_indent: "\n".to_owned(),
|
|
buffer: String::new(),
|
|
}
|
|
}
|
|
|
|
pub fn copy_empty(&self) -> Formatter {
|
|
Formatter {
|
|
width: self.width,
|
|
indent_delta: self.indent_delta.clone(),
|
|
current_indent: self.current_indent.clone(),
|
|
buffer: String::new(),
|
|
}
|
|
}
|
|
|
|
pub fn indent_size(self) -> usize {
|
|
self.indent_delta.len()
|
|
}
|
|
|
|
pub fn set_indent_size(&mut self, n: usize) {
|
|
self.indent_delta = str::repeat(" ", n)
|
|
}
|
|
|
|
pub fn write<E: Emittable>(&mut self, e: E) {
|
|
e.write_on(self)
|
|
}
|
|
|
|
pub fn newline(&mut self) {
|
|
self.buffer.push_str(&self.current_indent)
|
|
}
|
|
|
|
pub fn to_string<E: Emittable>(e: E) -> String {
|
|
let mut f = Formatter::new();
|
|
f.write(e);
|
|
f.buffer
|
|
}
|
|
|
|
pub fn with_indent<R, F: FnOnce(&mut Self) -> R>(&mut self, f: F) -> R {
|
|
let old_indent = self.current_indent.clone();
|
|
self.current_indent += &self.indent_delta;
|
|
let r = f(self);
|
|
self.current_indent = old_indent;
|
|
r
|
|
}
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
|
|
impl Emittable for &str {
|
|
fn write_on(&self, f: &mut Formatter) {
|
|
f.buffer.push_str(self)
|
|
}
|
|
}
|
|
|
|
impl Emittable for String {
|
|
fn write_on(&self, f: &mut Formatter) {
|
|
f.write(self.as_str())
|
|
}
|
|
}
|
|
|
|
impl<'a, E: Emittable> Emittable for &'a Vec<E> where &'a E: Emittable {
|
|
fn write_on(&self, f: &mut Formatter) {
|
|
for e in self.iter() {
|
|
f.write(e)
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Emittable for Sequence {
|
|
fn write_on(&self, f: &mut Formatter) {
|
|
let mut need_sep = false;
|
|
for e in self.items.iter() {
|
|
if need_sep {
|
|
self.separator.write_on(f)
|
|
} else {
|
|
need_sep = true
|
|
}
|
|
e.write_on(f)
|
|
}
|
|
self.terminator.write_on(f)
|
|
}
|
|
}
|
|
|
|
impl Emittable for Grouping {
|
|
fn write_on(&self, f: &mut Formatter) {
|
|
let mut g = f.copy_empty();
|
|
self.open.write_on(&mut g);
|
|
g.write(&self.sequence);
|
|
self.close.write_on(&mut g);
|
|
let s = g.buffer;
|
|
if s.len() <= f.width {
|
|
f.write(&s)
|
|
} else {
|
|
self.open.write_on(f);
|
|
if !self.sequence.items.is_empty() {
|
|
f.with_indent(|f| {
|
|
let mut i = self.sequence.items.len();
|
|
for e in self.sequence.items.iter() {
|
|
f.newline();
|
|
e.write_on(f);
|
|
let delim = if i == 1 { self.sequence.terminator } else { self.sequence.separator };
|
|
delim.trim_end().write_on(f);
|
|
i = i - 1;
|
|
}
|
|
});
|
|
f.newline()
|
|
}
|
|
self.close.write_on(f);
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a, E: Emittable> Emittable for &'a E {
|
|
fn write_on(&self, f: &mut Formatter) {
|
|
(*self).write_on(f)
|
|
}
|
|
}
|
|
|
|
impl Emittable for Item {
|
|
fn write_on(&self, f: &mut Formatter) {
|
|
(**self).write_on(f)
|
|
}
|
|
}
|
|
|
|
impl std::fmt::Debug for Sequence {
|
|
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
|
|
f.write_str(&Formatter::to_string(self))
|
|
}
|
|
}
|
|
|
|
impl std::fmt::Debug for Grouping {
|
|
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
|
|
f.write_str(&Formatter::to_string(self))
|
|
}
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
|
|
pub fn escape_string(s: &str) -> String {
|
|
let mut buf = String::new();
|
|
buf.push('"');
|
|
for c in s.chars() {
|
|
match c {
|
|
'\\' => buf.push_str("\\\\"),
|
|
'"' => buf.push_str("\\\""),
|
|
_ if c >= ' ' && c <= '~' => buf.push(c),
|
|
_ => write!(&mut buf, "\\u{{{:x}}}", c as i32).expect("no IO errors building a string"),
|
|
}
|
|
}
|
|
buf.push('"');
|
|
buf
|
|
}
|
|
|
|
pub fn escape_bytes(bs: &[u8]) -> String {
|
|
let mut buf = String::new();
|
|
buf.push_str("b\"");
|
|
for b in bs {
|
|
let c = *b as char;
|
|
match c {
|
|
'\\' => buf.push_str("\\\\"),
|
|
'"' => buf.push_str("\\\""),
|
|
_ if c >= ' ' && c <= '~' => buf.push(c),
|
|
_ => write!(&mut buf, "\\x{{{:02x}}}", b).expect("no IO errors building a string"),
|
|
}
|
|
}
|
|
buf.push('"');
|
|
buf
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
|
|
pub mod constructors {
|
|
use super::Sequence;
|
|
use super::Grouping;
|
|
use super::Item;
|
|
use super::Emittable;
|
|
|
|
pub fn item<E: 'static + Emittable>(i: E) -> Item {
|
|
std::rc::Rc::new(i)
|
|
}
|
|
|
|
pub fn name(pieces: Vec<Item>) -> Sequence {
|
|
Sequence { items: pieces, separator: "::", terminator: "" }
|
|
}
|
|
|
|
pub fn seq(items: Vec<Item>) -> Sequence {
|
|
Sequence { items: items, separator: "", terminator: "" }
|
|
}
|
|
|
|
pub fn commas(items: Vec<Item>) -> Sequence {
|
|
Sequence { items: items, separator: ", ", terminator: "" }
|
|
}
|
|
|
|
pub fn parens(items: Vec<Item>) -> Grouping {
|
|
Grouping { sequence: commas(items), open: "(", close: ")" }
|
|
}
|
|
|
|
pub fn brackets(items: Vec<Item>) -> Grouping {
|
|
Grouping { sequence: commas(items), open: "[", close: "]" }
|
|
}
|
|
|
|
pub fn anglebrackets(items: Vec<Item>) -> Grouping {
|
|
Grouping { sequence: commas(items), open: "<", close: ">" }
|
|
}
|
|
|
|
pub fn braces(items: Vec<Item>) -> Grouping {
|
|
Grouping { sequence: commas(items), open: "{", close: "}" }
|
|
}
|
|
|
|
pub fn block(items: Vec<Item>) -> Grouping {
|
|
Grouping {
|
|
sequence: Sequence { items: items, separator: " ", terminator: "" },
|
|
open: "{",
|
|
close: "}",
|
|
}
|
|
}
|
|
|
|
pub fn semiblock(items: Vec<Item>) -> Grouping {
|
|
Grouping {
|
|
sequence: Sequence { items: items, separator: "; ", terminator: "" },
|
|
open: "{",
|
|
close: "}",
|
|
}
|
|
}
|
|
}
|
|
|
|
pub mod macros {
|
|
#[macro_export]
|
|
macro_rules! name {
|
|
($($item:expr),*) => {crate::syntax::block::constructors::name(vec![$(std::rc::Rc::new($item)),*])}
|
|
}
|
|
|
|
#[macro_export]
|
|
macro_rules! seq {
|
|
($($item:expr),*) => {crate::syntax::block::constructors::seq(vec![$(std::rc::Rc::new($item)),*])}
|
|
}
|
|
|
|
#[macro_export]
|
|
macro_rules! commas {
|
|
($($item:expr),*) => {crate::syntax::block::constructors::commas(vec![$(std::rc::Rc::new($item)),*])}
|
|
}
|
|
|
|
#[macro_export]
|
|
macro_rules! parens {
|
|
($($item:expr),*) => {crate::syntax::block::constructors::parens(vec![$(std::rc::Rc::new($item)),*])}
|
|
}
|
|
|
|
#[macro_export]
|
|
macro_rules! brackets {
|
|
($($item:expr),*) => {crate::syntax::block::constructors::brackets(vec![$(std::rc::Rc::new($item)),*])}
|
|
}
|
|
|
|
#[macro_export]
|
|
macro_rules! anglebrackets {
|
|
($($item:expr),*) => {crate::syntax::block::constructors::anglebrackets(vec![$(std::rc::Rc::new($item)),*])}
|
|
}
|
|
|
|
#[macro_export]
|
|
macro_rules! braces {
|
|
($($item:expr),*) => {crate::syntax::block::constructors::braces(vec![$(std::rc::Rc::new($item)),*])}
|
|
}
|
|
|
|
#[macro_export]
|
|
macro_rules! block {
|
|
($($item:expr),*) => {crate::syntax::block::constructors::block(vec![$(std::rc::Rc::new($item)),*])}
|
|
}
|
|
|
|
#[macro_export]
|
|
macro_rules! semiblock {
|
|
($($item:expr),*) => {crate::syntax::block::constructors::semiblock(vec![$(std::rc::Rc::new($item)),*])}
|
|
}
|
|
}
|