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extern crate pom;
use pom::char_class::{alpha, hex_digit, oct_digit, multispace};
use pom::Parser;
use pom::parser::*;
use pom::DataInput;
use std::collections::HashMap;
use std::str::FromStr;
#[derive(Debug)]
pub enum Value {
LiteralString(Vec<u8>),
Name(Vec<u8>),
Number(String),
Integer(i64),
Array(Vec<Value>),
Operator(String),
Boolean(bool),
Dictionary(HashMap<String, Value>),
}
fn hex_char() -> Parser<u8, u8> {
let number = is_a(hex_digit).repeat(2);
number.collect().convert(|v|u8::from_str_radix(&String::from_utf8(v).unwrap(), 16))
}
fn comment() -> Parser<u8, ()> {
sym(b'%') * none_of(b"\r\n").repeat(0..) * eol().discard()
}
fn content_space() -> Parser<u8, ()> {
is_a(multispace).repeat(0..).discard()
}
fn operator() -> Parser<u8, String> {
(is_a(alpha) | one_of(b"*'\"")).repeat(1..).convert(|v|String::from_utf8(v))
}
fn oct_char() -> Parser<u8, u8> {
let number = is_a(oct_digit).repeat(1..4);
number.collect().convert(|v|u8::from_str_radix(&String::from_utf8(v).unwrap(), 8))
}
fn escape_sequence() -> Parser<u8, Vec<u8>> {
sym(b'\\') *
( sym(b'\\').map(|_| vec![b'\\'])
| sym(b'(').map(|_| vec![b'('])
| sym(b')').map(|_| vec![b')'])
| sym(b'n').map(|_| vec![b'\n'])
| sym(b'r').map(|_| vec![b'\r'])
| sym(b't').map(|_| vec![b'\t'])
| sym(b'b').map(|_| vec![b'\x08'])
| sym(b'f').map(|_| vec![b'\x0C'])
| oct_char().map(|c| vec![c])
| eol() .map(|_| vec![])
| empty() .map(|_| vec![])
)
}
fn nested_literal_string() -> Parser<u8, Vec<u8>> {
sym(b'(') *
( none_of(b"\\()").repeat(1..)
| escape_sequence()
| call(nested_literal_string)
).repeat(0..).map(|segments| {
let mut bytes = segments.into_iter().fold(
vec![b'('],
|mut bytes, mut segment| {
bytes.append(&mut segment);
bytes
});
bytes.push(b')');
bytes
})
- sym(b')')
}
fn literal_string() -> Parser<u8, Vec<u8>> {
sym(b'(') *
( none_of(b"\\()").repeat(1..)
| escape_sequence()
| nested_literal_string()
).repeat(0..).map(|segments|segments.concat())
- sym(b')')
}
fn name() -> Parser<u8, Vec<u8>> {
sym(b'/') * (none_of(b" \t\n\r\x0C()<>[]{}/%#") | sym(b'#') * hex_char()).repeat(0..)
}
fn integer() -> Parser<u8, i64> {
let number = one_of(b"+-").opt() + one_of(b"0123456789").repeat(1..);
number.collect().convert(|v|String::from_utf8(v)).convert(|s|i64::from_str(&s))
}
fn number() -> Parser<u8, String> {
let number = one_of(b"+-").opt() +
( (one_of(b"0123456789") - one_of(b"0123456789").repeat(0..).discard())
| (one_of(b"0123456789").repeat(1..) * sym(b'.') - one_of(b"0123456789").repeat(0..))
| sym(b'.') - one_of(b"0123456789").repeat(1..)
);
number.collect().convert(|v|String::from_utf8(v))
}
fn space() -> Parser<u8, ()> {
( one_of(b" \t\n\r\0\x0C").repeat(1..).discard()
).repeat(0..).discard()
}
fn dictionary() -> Parser<u8, HashMap<String, Value>> {
let entry = name() - space() + call(value);
let entries = seq(b"<<") * space() * entry.repeat(0..) - seq(b">>");
entries.map(|entries| entries.into_iter().fold(
HashMap::new(),
|mut dict: HashMap<String, Value>, (key, value)| { dict.insert(String::from_utf8(key).unwrap(), value); dict }
))
}
fn hexadecimal_string() -> Parser<u8, Vec<u8>> {
sym(b'<') * (space() * hex_char()).repeat(0..) - (space() * sym(b'>'))
}
fn eol() -> Parser<u8, u8> {
sym(b'\r') * sym(b'\n') | sym(b'\n') | sym(b'\r')
}
fn value() -> Parser<u8, Value> {
( seq(b"true").map(|_| Value::Boolean(true))
| seq(b"false").map(|_| Value::Boolean(false))
| integer().map(|v| Value::Integer(v))
| number().map(|v| Value::Number(v))
| name().map(|v| Value::Name(v))
| operator().map(|v| Value::Operator(v))
| literal_string().map(|v| Value::LiteralString(v))
| dictionary().map(|v| Value::Dictionary(v))
| hexadecimal_string().map(|v| Value::LiteralString(v))
| array().map(|v| Value::Array(v))
) - content_space()
}
fn array() -> Parser<u8, Vec<Value>> {
sym(b'[') * space() * call(value).repeat(0..) - sym(b']')
}
fn file() -> Parser<u8,Vec<Value>>
{
( comment().repeat(0..) * content_space() * value()).repeat(1..)
}
pub fn parse(input: &[u8]) -> Result<Vec<Value>, pom::Error> {
file().parse(&mut DataInput::new(input))
}
fn as_code(str: &[u8]) -> u32 {
let mut code: u32 = 0;
for c in str {
code = (code << 8) | (*c as u32);
}
code
}
pub fn get_unicode_map(input: &[u8]) -> Result<HashMap<u32, Vec<u8>>, &'static str> {
let lexed = parse(&input).expect("failed to parse");
let mut i = 0;
let mut map = HashMap::new();
while i < lexed.len() {
match lexed[i] {
Value::Operator(ref o) => {
match o.as_ref() {
"beginbfchar" => {
let count = if let &Value::Integer(ref c) = &lexed[i-1] { Ok(*c) } else { Err("beginbfchar exected int") }?;
i += 1;
for _ in 0..count {
let char_code = if let &Value::LiteralString(ref s) = &lexed[i] { Ok(s) } else { Err("beginbfchar exected hexstring") }?;
let uni_code = if let &Value::LiteralString(ref s) = &lexed[i+1] { Ok(s) } else { Err("beginbfchar exected hexstring") }?;
map.insert(as_code(char_code), uni_code.clone());
i += 2;
}
i += 1;
}
"beginbfrange" => {
let count = if let &Value::Integer(ref c) = &lexed[i-1] { Ok(*c) } else { Err("beginbfrange exected int") }?;
i += 1;
for _ in 0..count {
let lower_code = if let &Value::LiteralString(ref s) = &lexed[i] { Ok(as_code(s)) } else { Err("beginbfrange exected hexstring") }?;
let upper_code = if let &Value::LiteralString(ref s) = &lexed[i+1] { Ok(as_code(s)) } else { Err("beginbfrange exected hexstring") }?;
match &lexed[i+2] {
&Value::LiteralString(ref start) => {
let mut unicode = start.clone();
let n = unicode.len() - 1;
for c in lower_code..upper_code+1 {
let mut unicode = unicode.clone();
unicode[n] += (c - lower_code) as u8;
map.insert(c, unicode);
}
}
&Value::Array(ref codes) => {
let mut i = 0;
if (upper_code - lower_code + 1) as usize != codes.len() {
return Err("bad length of array");
}
for c in lower_code..upper_code+1 {
map.insert(c, if let &Value::LiteralString(ref s) = &codes[i] { Ok(s.clone()) } else { Err("beginbfrange exected hexstring") }?);
i += 1;
}
}
_ => { return Err("beginbfrange exected array or literal") }
}
i += 3;
}
i += 1;
}
_ => { i += 1; }
}
}
_ => { i += 1; }
}
}
Ok(map)
}
#[cfg(test)]
mod tests {
use parse;
use std::fs::File;
use std::io::BufReader;
use std::io::Read;
fn do_parse(input: &[u8]) {
let result = parse(input);
if let Ok(lines) = result {
for l in lines {
println!("{:?}", l)
}
} else {
println!("{:?}", result)
}
}
#[test]
fn it_works() {
let f = File::open("example").unwrap();
let mut f = BufReader::new(f);
let mut contents = Vec::new();
f.read_to_end(&mut contents);
do_parse(&contents);
}
}