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ex_6.rs
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ex_6.rs
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/*
Copyright © 2013 Free Software Foundation, Inc
See licensing in LICENSE file
File: examples/ex_6.rs
Author: Jesse 'Jeaye' Wilkerson
Description:
Extension of ex_3 that adds naive syntax
highlighting to showcase attributes.
Usage:
./bin/ex_6 <rust file>
Example:
./bin/ex_6 examples/ex_6.rs
*/
extern crate ncurses;
use std::{ char, env, fs };
use std::path::Path;
use std::io::{Read, Bytes};
use std::iter::Peekable;
use ncurses::*;
/* Individual color handles. */
static COLOR_BACKGROUND: i16 = 16;
static COLOR_FOREGROUND: i16 = 17;
static COLOR_KEYWORD: i16 = 18;
static COLOR_TYPE: i16 = 19;
static COLOR_STORAGE: i16 = 20;
static COLOR_COMMENT: i16 = 21;
static COLOR_STRING: i16 = 22;
static COLOR_CHAR: i16 = 23;
static COLOR_NUMBER: i16 = 24;
/* Color pairs; foreground && background. */
static COLOR_PAIR_DEFAULT: i16 = 1;
static COLOR_PAIR_KEYWORD: i16 = 2;
static COLOR_PAIR_TYPE: i16 = 3;
static COLOR_PAIR_STORAGE: i16 = 4;
static COLOR_PAIR_COMMENT: i16 = 5;
static COLOR_PAIR_STRING: i16 = 6;
static COLOR_PAIR_CHAR: i16 = 7;
static COLOR_PAIR_NUMBER: i16 = 8;
/* Word delimiters. */
static WORD_LIMITS: &'static [u8] = &
[
' ' as u8,
'(' as u8,
')' as u8,
':' as u8,
';' as u8,
'&' as u8,
'+' as u8,
'-' as u8,
',' as u8,
'.' as u8,
'@' as u8,
'~' as u8,
'\\' as u8,
'\n' as u8,
'\r' as u8,
'\0' as u8,
!0 as u8,
];
struct Pager
{
file_reader: Peekable<Bytes<fs::File>>,
in_comment: bool,
in_string: bool,
in_char: bool,
screen_width: i32,
screen_height: i32,
curr_x: i32,
curr_y: i32,
}
impl Pager
{
pub fn new() -> Pager
{
Pager
{
file_reader: open_file().bytes().peekable(),
in_comment: false,
in_string: false,
in_char: false,
screen_width: 0,
screen_height: 0,
curr_x: 0,
curr_y: 0,
}
}
pub fn initialize(&mut self)
{
/* Start ncurses. */
initscr();
keypad(stdscr(), true);
noecho();
/* Start colors. */
start_color();
init_color(COLOR_BACKGROUND, 0, 43 * 4, 54 * 4);
init_color(COLOR_FOREGROUND, 142 * 4, 161 * 4, 161 * 4);
init_color(COLOR_KEYWORD, 130 * 4, 151 * 4, 0);
init_color(COLOR_TYPE, 197 * 4, 73 * 4, 27 * 4);
init_color(COLOR_STORAGE, 219 * 4, 51 * 4, 47 * 4);
init_color(COLOR_COMMENT, 33 * 4, 138 * 4, 206 * 4);
init_color(COLOR_STRING, 34 * 4, 154 * 4, 142 * 4);
init_color(COLOR_CHAR, 34 * 4, 154 * 4, 142 * 4);
init_color(COLOR_NUMBER, 236 * 4, 107 * 4, 83 * 4);
init_pair(COLOR_PAIR_DEFAULT, COLOR_FOREGROUND, COLOR_BACKGROUND);
init_pair(COLOR_PAIR_KEYWORD, COLOR_KEYWORD, COLOR_BACKGROUND);
init_pair(COLOR_PAIR_TYPE, COLOR_TYPE, COLOR_BACKGROUND);
init_pair(COLOR_PAIR_STORAGE, COLOR_STORAGE, COLOR_BACKGROUND);
init_pair(COLOR_PAIR_COMMENT, COLOR_COMMENT, COLOR_BACKGROUND);
init_pair(COLOR_PAIR_STRING, COLOR_STRING, COLOR_BACKGROUND);
init_pair(COLOR_PAIR_CHAR, COLOR_CHAR, COLOR_BACKGROUND);
init_pair(COLOR_PAIR_NUMBER, COLOR_NUMBER, COLOR_BACKGROUND);
/* Set the window's background color. */
bkgd(' ' as chtype | COLOR_PAIR(COLOR_PAIR_DEFAULT) as chtype);
/* Get the screen bounds. */
getmaxyx(stdscr(), &mut self.screen_height, &mut self.screen_width);
}
/* Returns the word and delimiter following it. */
pub fn read_word(&mut self) -> (String, char)
{
let mut s: Vec<u8> = vec![];
let mut ch : u8 = self.file_reader.next().unwrap().ok().expect("Unable to read byte");
/* Read until we hit a word delimiter. */
while !WORD_LIMITS.contains(&ch)
{
s.push(ch);
ch = self.file_reader.next().unwrap().ok().expect("Unable to read byte");
}
/* Return the word string and the terminating delimiter. */
match char::from_u32(ch as u32)
{
Some(ch) => (String::from_utf8(s).ok().expect("utf-8 conversion failed"), ch),
None => (String::from_utf8(s).ok().expect("utf-8 conversion failed"), ' '),
}
}
/* Retuns the attribute the given word requires. */
pub fn highlight_word(&mut self, word: &str) -> attr_t
{
/* Comments. */
if self.in_comment && !word.contains("*/")
{ return COLOR_PAIR(COLOR_PAIR_COMMENT); }
else if self.in_comment && word.contains("*/")
{
self.in_comment = false;
return COLOR_PAIR(COLOR_PAIR_COMMENT);
}
else if !self.in_comment && word.contains("/*")
{
self.in_comment = true;
return COLOR_PAIR(COLOR_PAIR_COMMENT);
}
/* Strings. */
if !self.in_char
{
if self.in_string && !word.contains("\"")
{ return COLOR_PAIR(COLOR_PAIR_STRING); }
else if self.in_string && word.contains("\"")
{
self.in_string = false;
return COLOR_PAIR(COLOR_PAIR_STRING);
}
else if !self.in_string && word.contains("\"")
{
/* If the same quote is found from either direction
* then it's the only quote in the string. */
if word.find('\"') == word.rfind('\"')
{ self.in_string = true; }
return COLOR_PAIR(COLOR_PAIR_STRING);
}
}
/* Chars. */
if self.in_char && !word.contains("\'")
{ return COLOR_PAIR(COLOR_PAIR_CHAR); }
else if self.in_char && word.contains("\'")
{
self.in_char = false;
return COLOR_PAIR(COLOR_PAIR_CHAR);
}
else if !self.in_char && word.contains("\'") && !word.contains("static")
{
/* If the same quote is found from either direction
* then it's the only quote in the string. */
if word.find('\'') == word.rfind('\'')
{ self.in_char = true; }
return COLOR_PAIR(COLOR_PAIR_CHAR);
}
/* Trim the word of all delimiters. */
let word = word.trim_matches(|ch: char|
{ WORD_LIMITS.contains(&(ch as u8)) });
if word.len() == 0
{ return 0; }
/* If it starts with a number, it is a number. */
if word.as_bytes()[0] >= '0' as u8 && word.as_bytes()[0] <= '9' as u8
{ return COLOR_PAIR(COLOR_PAIR_NUMBER); }
match word
{
/* Key words. */
"break" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"continue" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"do" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"else" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"extern" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"in" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"if" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"impl" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"let" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"log" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"loop" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"match" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"once" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"priv" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"pub" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"return" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"unsafe" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"while" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"use" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"mod" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"trait" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"struct" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"enum" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"type" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
"fn" => { COLOR_PAIR(COLOR_PAIR_KEYWORD) },
/* Types. */
"int" => { COLOR_PAIR(COLOR_PAIR_TYPE) },
"uint" => { COLOR_PAIR(COLOR_PAIR_TYPE) },
"char" => { COLOR_PAIR(COLOR_PAIR_TYPE) },
"bool" => { COLOR_PAIR(COLOR_PAIR_TYPE) },
"u8" => { COLOR_PAIR(COLOR_PAIR_TYPE) },
"u16" => { COLOR_PAIR(COLOR_PAIR_TYPE) },
"u32" => { COLOR_PAIR(COLOR_PAIR_TYPE) },
"u64" => { COLOR_PAIR(COLOR_PAIR_TYPE) },
"i16" => { COLOR_PAIR(COLOR_PAIR_TYPE) },
"i32" => { COLOR_PAIR(COLOR_PAIR_TYPE) },
"i64" => { COLOR_PAIR(COLOR_PAIR_TYPE) },
"f32" => { COLOR_PAIR(COLOR_PAIR_TYPE) },
"f64" => { COLOR_PAIR(COLOR_PAIR_TYPE) },
"str" => { COLOR_PAIR(COLOR_PAIR_TYPE) },
"self" => { COLOR_PAIR(COLOR_PAIR_TYPE) },
"Self" => { COLOR_PAIR(COLOR_PAIR_TYPE) },
/* Storage. */
"const" => { COLOR_PAIR(COLOR_PAIR_STORAGE) },
"mut" => { COLOR_PAIR(COLOR_PAIR_STORAGE) },
"ref" => { COLOR_PAIR(COLOR_PAIR_STORAGE) },
"static" => { COLOR_PAIR(COLOR_PAIR_STORAGE) },
/* Not something we need to highlight. */
_ => 0,
}
}
}
impl Drop for Pager
{
fn drop(&mut self)
{
/* Final prompt before closing. */
mv(self.screen_height - 1, 0);
prompt();
endwin();
}
}
fn main()
{
let mut pager = Pager::new();
pager.initialize();
/* Read the whole file. */
while pager.file_reader.peek().is_some()
{
/* Read a word at a time. */
let (word, leftover) = pager.read_word();
let attr = pager.highlight_word(word.as_ref());
let leftover_attr = pager.highlight_word(format!("{}", leftover).as_ref());
/* Get the current position on the screen. */
getyx(stdscr(), &mut pager.curr_y, &mut pager.curr_x);
if pager.curr_y == (pager.screen_height - 1)
{
/* Status bar at the bottom. */
prompt();
/* Once a key is pressed, clear the screen and continue. */
clear();
mv(0, 0);
}
else
{
attron(attr);
addstr(word.as_ref()).unwrap();
attroff(attr);
attron(leftover_attr);
addch(leftover as chtype);
attroff(leftover_attr);
}
}
}
fn prompt()
{
attron(A_BOLD);
addstr("<-Press Space->").unwrap();
while getch() != ' ' as i32
{ }
attroff(A_BOLD);
}
fn open_file() -> fs::File
{
let args : Vec<_> = env::args().collect();
if args.len() != 2
{
println!("Usage:\n\t{} <rust file>", args[0]);
println!("Example:\n\t{} examples/ex_5.rs", args[0]);
panic!("Exiting");
}
let reader = fs::File::open(Path::new(&args[1]));
reader.ok().expect("Unable to open file")
}