From d1c09f2561f75a911f044245c96ad2e862444c6c Mon Sep 17 00:00:00 2001
From: "Dustin J. Mitchell" <dustin@mozilla.com>
Date: Fri, 9 Nov 2018 19:34:55 -0500
Subject: [PATCH] parse a TDB2 file

---
 .gitignore     |   2 +
 Cargo.lock     | 468 +++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml     |   9 +
 src/main.rs    | 103 +++++++++++
 src/nibbler.rs | 292 ++++++++++++++++++++++++++++++
 5 files changed, 874 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs
 create mode 100644 src/nibbler.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 000000000..53eaa2196
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+**/*.rs.bk
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 000000000..81866a154
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,468 @@
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 000000000..39089eff2
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "rask"
+version = "0.1.0"
+authors = ["Dustin J. Mitchell <dustin@mozilla.com>"]
+
+[dependencies]
+clap = "2.32"
+console = "0.6.2"
+indicatif = "0.9.0"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 000000000..169c99a71
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,103 @@
+mod nibbler;
+
+use std::str;
+
+use std::io::{stdin, BufRead, Result, Error, ErrorKind};
+use nibbler::Nibbler;
+
+/// Decode the given byte slice into a string using Taskwarrior JSON's escaping The slice is
+/// assumed to be ASCII; unicode escapes within it will be expanded.
+// TODO: return Cow
+fn json_decode(value: &[u8]) -> String {
+    let length = value.len();
+    let mut rv = String::with_capacity(length);
+
+    let mut pos = 0;
+    while pos < length {
+        let v = value[pos];
+        if v == b'\\' {
+            pos += 1;
+            if pos == length {
+                rv.push(v as char);
+                break;
+            }
+            let v = value[pos];
+            match v {
+                b'"' | b'\\' | b'/' => rv.push(v as char),
+                b'b' => rv.push(8 as char),
+                b'f' => rv.push(12 as char),
+                b'n' => rv.push('\n' as char),
+                b'r' => rv.push('\r' as char),
+                b't' => rv.push('\t' as char),
+                b'u' => panic!("omg please no"),
+                _ => {
+                    rv.push(b'\\' as char);
+                    rv.push(v as char);
+                }
+            }
+        } else {
+            rv.push(v as char)
+        }
+        pos += 1;
+    }
+
+    rv
+}
+
+fn decode(value: String) -> String {
+    if let Some(_) = value.find('&') {
+        return value.replace("&open;", "[").replace("&close;", "]");
+    }
+    value
+}
+
+fn parse_ff4(line: &str) -> Result<()> {
+    let mut nib = Nibbler::new(line.as_bytes());
+    println!("{}", line);
+
+    if !nib.skip(b'[') {
+        return Err(Error::new(ErrorKind::Other, "bad line"));
+    }
+    if let Some(line) = nib.get_until(b']') {
+        let mut nib = Nibbler::new(line);
+        while !nib.depleted() {
+            if let Some(name) = nib.get_until(b':') {
+                if !nib.skip(b':') {
+                    return Err(Error::new(ErrorKind::Other, "bad line"));
+                }
+                if let Some(value) = nib.get_quoted(b'"') {
+                    let value = json_decode(value);
+                    let value = decode(value);
+                    println!("{}={}", str::from_utf8(name).unwrap(), value);
+                } else {
+                    return Err(Error::new(ErrorKind::Other, "bad line"));
+                }
+                nib.skip(b' ');
+            } else {
+                return Err(Error::new(ErrorKind::Other, "bad line"));
+            }
+        }
+    } else {
+        return Err(Error::new(ErrorKind::Other, "bad line"));
+    }
+    if !nib.skip(b']') {
+        return Err(Error::new(ErrorKind::Other, "bad line"));
+    }
+    if !nib.depleted() {
+        return Err(Error::new(ErrorKind::Other, "bad line"));
+    }
+    Ok(())
+}
+
+fn parse_tdb2() -> Result<()> {
+    let input = stdin();
+    for line in input.lock().lines() {
+        parse_ff4(&line?)?;
+    }
+    Ok(())
+}
+
+fn main() {
+    parse_tdb2().unwrap();
+    println!("Done");
+}
diff --git a/src/nibbler.rs b/src/nibbler.rs
new file mode 100644
index 000000000..dbc3df920
--- /dev/null
+++ b/src/nibbler.rs
@@ -0,0 +1,292 @@
+pub struct Nibbler<'a> {
+    input: &'a [u8],
+    cursor: usize,
+}
+
+impl<'a> Nibbler<'a> {
+    pub fn new(input: &'a [u8]) -> Self {
+        Nibbler {
+            input: input,
+            cursor: 0,
+        }
+    }
+
+    pub fn get_until(&mut self, c: u8) -> Option<&'a [u8]> {
+        if self.cursor >= self.input.len() {
+            return None;
+        }
+
+        let mut i = self.cursor;
+        while i < self.input.len() {
+            if self.input[i] == c {
+                let rv = &self.input[self.cursor..i];
+                self.cursor = i;
+                return Some(rv);
+            }
+            i += 1;
+        }
+        let rv = &self.input[self.cursor..];
+        self.cursor = self.input.len();
+        Some(rv)
+    }
+
+    // TODO: get_until_str
+    // TODO: get_until_one_of
+    // TODO: get_until_ws
+
+    pub fn get_until_eos(&mut self) -> Option<&'a [u8]> {
+        if self.cursor >= self.input.len() {
+            return None;
+        }
+        let rv = &self.input[self.cursor..];
+        self.cursor = self.input.len();
+        return Some(rv);
+    }
+
+    // TODO: get_n
+
+    pub fn get_quoted(&mut self, c: u8) -> Option<&'a [u8]> {
+        let length = self.input.len();
+        if self.cursor >= length || self.input[self.cursor] != c {
+            return None;
+        }
+
+        let start = self.cursor + 1;
+        let mut i = start;
+
+        while i < length {
+            while i < length && self.input[i] != c {
+                i += 1
+            }
+            if i == length {
+                // unclosed quote
+                return None;
+            }
+            if i == start {
+                return Some(&self.input[i..i]);
+            }
+
+            if self.input[i - 1] == b'\\' {
+                // work backward looking for escaped backslashes
+                let mut j = i - 2;
+                let mut quote = true;
+                while j >= start && self.input[j] == b'\\' {
+                    quote = !quote;
+                    j -= 1;
+                }
+
+                if quote {
+                    i += 1;
+                    continue;
+                }
+            }
+
+            // none of the above matched, so we are at the end
+            self.cursor = i + 1;
+            return Some(&self.input[start..i]);
+        }
+
+        unreachable!();
+    }
+
+    // TODO: (missing funcs)
+
+    pub fn skip_n(&mut self, n: usize) -> bool {
+        let length = self.input.len();
+        if self.cursor < length && self.cursor + n <= length {
+            self.cursor += n;
+            return true;
+        }
+
+        return false;
+    }
+
+    pub fn skip(&mut self, c: u8) -> bool {
+        if self.cursor < self.input.len() && self.input[self.cursor] == c {
+            self.cursor += 1;
+            return true;
+        }
+        false
+    }
+
+    // TODO: skip_all_one_of
+    // TODO: skip_ws
+
+    pub fn next(&mut self) -> Option<u8> {
+        if self.cursor >= self.input.len() {
+            return None;
+        }
+        let rv = self.input[self.cursor];
+        self.cursor += 1;
+        return Some(rv);
+    }
+
+    // TODO: next_n
+    // TODO: cursor
+    // TODO: save
+    // TODO: restore
+
+    pub fn depleted(&self) -> bool {
+        self.cursor >= self.input.len()
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::Nibbler;
+
+    #[test]
+    fn test_get_until() {
+        let s = b"abc:123";
+        let mut nib = Nibbler::new(s);
+        assert_eq!(nib.get_until(b':'), Some(&s[..3]));
+    }
+
+    #[test]
+    fn test_get_until_empty() {
+        let s = b"abc:123";
+        let mut nib = Nibbler::new(s);
+        assert_eq!(nib.get_until(b'a'), Some(&s[..0]));
+    }
+
+    #[test]
+    fn test_get_until_not_found() {
+        let s = b"abc:123";
+        let mut nib = Nibbler::new(s);
+        assert_eq!(nib.get_until(b'/'), Some(&s[..]));
+    }
+
+    #[test]
+    fn test_get_until_eos() {
+        let s = b"abc:123";
+        let mut nib = Nibbler::new(s);
+        assert_eq!(nib.get_until_eos(), Some(&s[..]));
+    }
+
+    #[test]
+    fn test_get_quoted() {
+        let s = b"'abcd'efg";
+        let mut nib = Nibbler::new(s);
+        assert_eq!(nib.get_quoted(b'\''), Some(&s[1..5]));
+        assert_eq!(nib.next(), Some(b'e'));
+    }
+
+    #[test]
+    fn test_get_quoted_unopened() {
+        let s = b"abcd'efg";
+        let mut nib = Nibbler::new(s);
+        assert_eq!(nib.get_quoted(b'\''), None);
+        assert_eq!(nib.next(), Some(b'a')); // nothing consumed
+    }
+
+    #[test]
+    fn test_get_quoted_unclosed() {
+        let s = b"'abcdefg";
+        let mut nib = Nibbler::new(s);
+        assert_eq!(nib.get_quoted(b'\''), None);
+        assert_eq!(nib.next(), Some(b'\'')); // nothing consumed
+    }
+
+    #[test]
+    fn test_get_quoted_escaped() {
+        let s = b"'abc\\'de'fg";
+        let mut nib = Nibbler::new(s);
+        assert_eq!(nib.get_quoted(b'\''), Some(&s[1..8]));
+        assert_eq!(nib.next(), Some(b'f'));
+    }
+
+    #[test]
+    fn test_get_quoted_double_escaped() {
+        let s = b"'abc\\\\'de'fg";
+        let mut nib = Nibbler::new(s);
+        assert_eq!(nib.get_quoted(b'\''), Some(&s[1..6]));
+        assert_eq!(nib.next(), Some(b'd'));
+    }
+
+    #[test]
+    fn test_get_quoted_triple_escaped() {
+        let s = b"'abc\\\\\\'de'fg";
+        let mut nib = Nibbler::new(s);
+        assert_eq!(nib.get_quoted(b'\''), Some(&s[1..10]));
+        assert_eq!(nib.next(), Some(b'f'));
+    }
+
+    #[test]
+    fn test_get_quoted_all_escapes() {
+        let s = b"'\\\\\\'\\\\'fg";
+        let mut nib = Nibbler::new(s);
+        assert_eq!(nib.get_quoted(b'\''), Some(&s[1..7]));
+        assert_eq!(nib.next(), Some(b'f'));
+    }
+
+    #[test]
+    fn test_skip_n() {
+        let s = b"abc:123";
+        let mut nib = Nibbler::new(s);
+        assert!(nib.skip_n(3));
+        assert_eq!(nib.get_until_eos(), Some(&s[3..]));
+    }
+
+    #[test]
+    fn test_skip_n_too_long() {
+        let s = b"abc:123";
+        let mut nib = Nibbler::new(s);
+        assert!(!nib.skip_n(33));
+        // nothing is consumed
+        assert_eq!(nib.get_until_eos(), Some(&s[..]));
+    }
+
+    #[test]
+    fn test_skip_n_exact_eos() {
+        let s = b"abc:123";
+        let mut nib = Nibbler::new(s);
+        assert!(nib.skip_n(7));
+        assert_eq!(nib.get_until_eos(), None);
+    }
+
+    #[test]
+    fn test_skip_match() {
+        let s = b"foo";
+        let mut nib = Nibbler::new(s);
+        assert!(nib.skip(b'f'));
+        assert_eq!(nib.get_until_eos(), Some(&s[1..]));
+    }
+
+    #[test]
+    fn test_skip_no_match() {
+        let s = b"foo";
+        let mut nib = Nibbler::new(s);
+        assert!(!nib.skip(b'x'));
+        assert_eq!(nib.get_until_eos(), Some(&s[..]));
+    }
+
+    #[test]
+    fn test_skip_eos() {
+        let s = b"foo";
+        let mut nib = Nibbler::new(s);
+        assert!(nib.skip_n(3));
+        assert!(!nib.skip(b'x'));
+    }
+
+    #[test]
+    fn test_next() {
+        let s = b"foo";
+        let mut nib = Nibbler::new(s);
+        assert_eq!(nib.next(), Some(b'f'));
+        assert_eq!(nib.next(), Some(b'o'));
+        assert_eq!(nib.next(), Some(b'o'));
+        assert_eq!(nib.next(), None);
+        assert_eq!(nib.next(), None);
+    }
+
+    #[test]
+    fn test_depleted() {
+        let s = b"xy";
+        let mut nib = Nibbler::new(s);
+        assert!(!nib.depleted());
+        assert_eq!(nib.next(), Some(b'x'));
+        assert!(!nib.depleted());
+        assert_eq!(nib.next(), Some(b'y'));
+        assert!(nib.depleted());
+    }
+}