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
#[cfg(feature = "std")]
use crate::internal::IResult;
#[cfg(feature = "std")]
use std::fmt::Debug;

#[cfg(feature = "std")]
/// Helper trait to show a byte slice as a hex dump
pub trait HexDisplay {
  /// Converts the value of `self` to a hex dump, returning the owned
  /// string.
  fn to_hex(&self, chunk_size: usize) -> String;

  /// Converts the value of `self` to a hex dump beginning at `from` address, returning the owned
  /// string.
  fn to_hex_from(&self, chunk_size: usize, from: usize) -> String;
}

#[cfg(feature = "std")]
static CHARS: &'static [u8] = b"0123456789abcdef";

#[cfg(feature = "std")]
impl HexDisplay for [u8] {
  #[allow(unused_variables)]
  fn to_hex(&self, chunk_size: usize) -> String {
    self.to_hex_from(chunk_size, 0)
  }

  #[allow(unused_variables)]
  fn to_hex_from(&self, chunk_size: usize, from: usize) -> String {
    let mut v = Vec::with_capacity(self.len() * 3);
    let mut i = from;
    for chunk in self.chunks(chunk_size) {
      let s = format!("{:08x}", i);
      for &ch in s.as_bytes().iter() {
        v.push(ch);
      }
      v.push(b'\t');

      i += chunk_size;

      for &byte in chunk {
        v.push(CHARS[(byte >> 4) as usize]);
        v.push(CHARS[(byte & 0xf) as usize]);
        v.push(b' ');
      }
      if chunk_size > chunk.len() {
        for j in 0..(chunk_size - chunk.len()) {
          v.push(b' ');
          v.push(b' ');
          v.push(b' ');
        }
      }
      v.push(b'\t');

      for &byte in chunk {
        if (byte >= 32 && byte <= 126) || byte >= 128 {
          v.push(byte);
        } else {
          v.push(b'.');
        }
      }
      v.push(b'\n');
    }

    String::from_utf8_lossy(&v[..]).into_owned()
  }
}

#[cfg(feature = "std")]
impl HexDisplay for str {
  #[allow(unused_variables)]
  fn to_hex(&self, chunk_size: usize) -> String {
    self.to_hex_from(chunk_size, 0)
  }

  #[allow(unused_variables)]
  fn to_hex_from(&self, chunk_size: usize, from: usize) -> String {
    self.as_bytes().to_hex_from(chunk_size, from)
  }
}

#[doc(hidden)]
#[macro_export]
macro_rules! nom_line (
  () => (line!());
);

#[doc(hidden)]
#[macro_export]
macro_rules! nom_println (
  ($($args:tt)*) => (println!($($args)*));
);

#[doc(hidden)]
#[macro_export]
macro_rules! nom_stringify (
  ($($args:tt)*) => (stringify!($($args)*));
);


/// Prints a message if the parser fails
///
/// The message prints the `Error` or `Incomplete`
/// and the parser's calling code
///
/// ```
/// # #[macro_use] extern crate nom;
/// # fn main() {
///    named!(f, dbg!( tag!( "abcd" ) ) );
///
///    let a = &b"efgh"[..];
///
///    // Will print the following message:
///    // Error(Position(0, [101, 102, 103, 104])) at l.5 by ' tag ! ( "abcd" ) '
///    f(a);
/// # }
/// ```
#[macro_export(local_inner_macros)]
macro_rules! dbg (
  ($i: expr, $submac:ident!( $($args:tt)* )) => (
    {
      use $crate::lib::std::result::Result::*;
      let l = nom_line!();
      match $submac!($i, $($args)*) {
        Err(e) => {
          nom_println!("Err({:?}) at l.{} by ' {} '", e, l, nom_stringify!($submac!($($args)*)));
          Err(e)
        },
        a => a,
      }
    }
  );

  ($i:expr, $f:ident) => (
      dbg!($i, call!($f));
  );
);

/// Prints a message and the input if the parser fails
///
/// The message prints the `Error` or `Incomplete`
/// and the parser's calling code.
///
/// It also displays the input in hexdump format
///
/// ```rust
/// use nom::{IResult, dbg_dmp, bytes::complete::tag};
///
/// fn f(i: &[u8]) -> IResult<&[u8], &[u8]> {
///   dbg_dmp(tag("abcd"), "tag")(i)
/// }
///
///   let a = &b"efghijkl"[..];
///
/// // Will print the following message:
/// // Error(Position(0, [101, 102, 103, 104, 105, 106, 107, 108])) at l.5 by ' tag ! ( "abcd" ) '
/// // 00000000        65 66 67 68 69 6a 6b 6c         efghijkl
/// f(a);
/// ```
#[cfg(feature = "std")]
pub fn dbg_dmp<'a, F, O, E: Debug>(f: F, context: &'static str) -> impl Fn(&'a [u8]) -> IResult<&'a [u8], O, E>
  where F: Fn(&'a [u8]) -> IResult<&'a [u8], O, E> {
  move |i: &'a [u8]| {
      match f(i) {
        Err(e) => {
          println!("{}: Error({:?}) at:\n{}", context, e, i.to_hex(8));
          Err(e)
        },
        a => a,
      }
  }
}

/// Prints a message and the input if the parser fails
///
/// The message prints the `Error` or `Incomplete`
/// and the parser's calling code.
///
/// It also displays the input in hexdump format
///
/// ```ignore
/// # #[macro_use] extern crate nom;
/// # fn main() {
///    named!(f, dbg_dmp!( tag!( "abcd" ) ) );
///
///    let a = &b"efghijkl"[..];
///
///    // Will print the following message:
///    // Error(Position(0, [101, 102, 103, 104, 105, 106, 107, 108])) at l.5 by ' tag ! ( "abcd" ) '
///    // 00000000        65 66 67 68 69 6a 6b 6c         efghijkl
///    f(a);
/// # }
#[macro_export(local_inner_macros)]
#[cfg(feature = "std")]
macro_rules! dbg_dmp (
  ($i: expr, $submac:ident!( $($args:tt)* )) => (
    {
      use $crate::HexDisplay;
      let l = nom_line!();
      match $submac!($i, $($args)*) {
        Err(e) => {
          nom_println!("Error({:?}) at l.{} by ' {} '\n{}", e, l, nom_stringify!($submac!($($args)*)), $i.to_hex(8));
          Err(e)
        },
        a => a,
      }
    }
  );

  ($i:expr, $f:ident) => (
      dbg_dmp!($i, call!($f));
  );
);