681 lines
24 KiB
Rust
681 lines
24 KiB
Rust
//! Find the optimal data mode sequence to encode a piece of data.
|
||
use std::slice::Iter;
|
||
use types::{Mode, Version};
|
||
|
||
#[cfg(feature = "bench")]
|
||
use test::Bencher;
|
||
|
||
//------------------------------------------------------------------------------
|
||
//{{{ Segment
|
||
|
||
/// A segment of data committed to an encoding mode.
|
||
#[derive(PartialEq, Eq, Debug, Copy, Clone)]
|
||
pub struct Segment {
|
||
/// The encoding mode of the segment of data.
|
||
pub mode: Mode,
|
||
|
||
/// The start index of the segment.
|
||
pub begin: usize,
|
||
|
||
/// The end index (exclusive) of the segment.
|
||
pub end: usize,
|
||
}
|
||
|
||
impl Segment {
|
||
/// Compute the number of bits (including the size of the mode indicator and
|
||
/// length bits) when this segment is encoded.
|
||
pub fn encoded_len(&self, version: Version) -> usize {
|
||
let byte_size = self.end - self.begin;
|
||
let chars_count = if self.mode == Mode::Kanji { byte_size / 2 } else { byte_size };
|
||
|
||
let mode_bits_count = version.mode_bits_count();
|
||
let length_bits_count = self.mode.length_bits_count(version);
|
||
let data_bits_count = self.mode.data_bits_count(chars_count);
|
||
|
||
mode_bits_count + length_bits_count + data_bits_count
|
||
}
|
||
}
|
||
|
||
//}}}
|
||
//------------------------------------------------------------------------------
|
||
//{{{ Parser
|
||
|
||
/// This iterator is basically equivalent to
|
||
///
|
||
/// ```ignore
|
||
/// data.map(|c| ExclCharSet::from_u8(*c))
|
||
/// .chain(Some(ExclCharSet::End).move_iter())
|
||
/// .enumerate()
|
||
/// ```
|
||
///
|
||
/// But the type is too hard to write, thus the new type.
|
||
///
|
||
struct EcsIter<I> {
|
||
base: I,
|
||
index: usize,
|
||
ended: bool,
|
||
}
|
||
|
||
impl<'a, I: Iterator<Item = &'a u8>> Iterator for EcsIter<I> {
|
||
type Item = (usize, ExclCharSet);
|
||
|
||
fn next(&mut self) -> Option<(usize, ExclCharSet)> {
|
||
if self.ended {
|
||
return None;
|
||
}
|
||
|
||
match self.base.next() {
|
||
None => {
|
||
self.ended = true;
|
||
Some((self.index, ExclCharSet::End))
|
||
}
|
||
Some(c) => {
|
||
let old_index = self.index;
|
||
self.index += 1;
|
||
Some((old_index, ExclCharSet::from_u8(*c)))
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/// QR code data parser to classify the input into distinct segments.
|
||
pub struct Parser<'a> {
|
||
ecs_iter: EcsIter<Iter<'a, u8>>,
|
||
state: State,
|
||
begin: usize,
|
||
pending_single_byte: bool,
|
||
}
|
||
|
||
impl<'a> Parser<'a> {
|
||
/// Creates a new iterator which parse the data into segments that only
|
||
/// contains their exclusive subsets. No optimization is done at this point.
|
||
///
|
||
/// use qrcode::optimize::{Parser, Segment};
|
||
/// use qrcode::types::Mode::{Alphanumeric, Numeric, Byte};
|
||
///
|
||
/// let parse_res = Parser::new(b"ABC123abcd").collect::<Vec<Segment>>();
|
||
/// assert_eq!(parse_res, vec![Segment { mode: Alphanumeric, begin: 0, end: 3 },
|
||
/// Segment { mode: Numeric, begin: 3, end: 6 },
|
||
/// Segment { mode: Byte, begin: 6, end: 10 }]);
|
||
///
|
||
pub fn new(data: &[u8]) -> Parser {
|
||
Parser {
|
||
ecs_iter: EcsIter { base: data.iter(), index: 0, ended: false },
|
||
state: State::Init,
|
||
begin: 0,
|
||
pending_single_byte: false,
|
||
}
|
||
}
|
||
}
|
||
|
||
impl<'a> Iterator for Parser<'a> {
|
||
type Item = Segment;
|
||
|
||
fn next(&mut self) -> Option<Segment> {
|
||
if self.pending_single_byte {
|
||
self.pending_single_byte = false;
|
||
self.begin += 1;
|
||
return Some(Segment { mode: Mode::Byte, begin: self.begin - 1, end: self.begin });
|
||
}
|
||
|
||
loop {
|
||
let (i, ecs) = match self.ecs_iter.next() {
|
||
None => return None,
|
||
Some(a) => a,
|
||
};
|
||
let (next_state, action) = STATE_TRANSITION[self.state as usize + ecs as usize];
|
||
self.state = next_state;
|
||
|
||
let old_begin = self.begin;
|
||
let push_mode = match action {
|
||
Action::Idle => continue,
|
||
Action::Numeric => Mode::Numeric,
|
||
Action::Alpha => Mode::Alphanumeric,
|
||
Action::Byte => Mode::Byte,
|
||
Action::Kanji => Mode::Kanji,
|
||
Action::KanjiAndSingleByte => {
|
||
let next_begin = i - 1;
|
||
if self.begin == next_begin {
|
||
Mode::Byte
|
||
} else {
|
||
self.pending_single_byte = true;
|
||
self.begin = next_begin;
|
||
return Some(Segment { mode: Mode::Kanji, begin: old_begin, end: next_begin });
|
||
}
|
||
}
|
||
};
|
||
|
||
self.begin = i;
|
||
return Some(Segment { mode: push_mode, begin: old_begin, end: i });
|
||
}
|
||
}
|
||
}
|
||
|
||
#[cfg(test)]
|
||
mod parse_tests {
|
||
use optimize::{Parser, Segment};
|
||
use types::Mode;
|
||
|
||
fn parse(data: &[u8]) -> Vec<Segment> {
|
||
Parser::new(data).collect()
|
||
}
|
||
|
||
#[test]
|
||
fn test_parse_1() {
|
||
let segs = parse(b"01049123451234591597033130128%10ABC123");
|
||
assert_eq!(
|
||
segs,
|
||
vec![
|
||
Segment { mode: Mode::Numeric, begin: 0, end: 29 },
|
||
Segment { mode: Mode::Alphanumeric, begin: 29, end: 30 },
|
||
Segment { mode: Mode::Numeric, begin: 30, end: 32 },
|
||
Segment { mode: Mode::Alphanumeric, begin: 32, end: 35 },
|
||
Segment { mode: Mode::Numeric, begin: 35, end: 38 },
|
||
]
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_parse_shift_jis_example_1() {
|
||
let segs = parse(b"\x82\xa0\x81\x41\x41\xb1\x81\xf0"); // "あ、AｱÅ"
|
||
assert_eq!(
|
||
segs,
|
||
vec![
|
||
Segment { mode: Mode::Kanji, begin: 0, end: 4 },
|
||
Segment { mode: Mode::Alphanumeric, begin: 4, end: 5 },
|
||
Segment { mode: Mode::Byte, begin: 5, end: 6 },
|
||
Segment { mode: Mode::Kanji, begin: 6, end: 8 },
|
||
]
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_parse_utf_8() {
|
||
// Mojibake?
|
||
let segs = parse(b"\xe3\x81\x82\xe3\x80\x81A\xef\xbd\xb1\xe2\x84\xab");
|
||
assert_eq!(
|
||
segs,
|
||
vec![
|
||
Segment { mode: Mode::Kanji, begin: 0, end: 4 },
|
||
Segment { mode: Mode::Byte, begin: 4, end: 5 },
|
||
Segment { mode: Mode::Kanji, begin: 5, end: 7 },
|
||
Segment { mode: Mode::Byte, begin: 7, end: 10 },
|
||
Segment { mode: Mode::Kanji, begin: 10, end: 12 },
|
||
Segment { mode: Mode::Byte, begin: 12, end: 13 },
|
||
]
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_not_kanji_1() {
|
||
let segs = parse(b"\x81\x30");
|
||
assert_eq!(
|
||
segs,
|
||
vec![Segment { mode: Mode::Byte, begin: 0, end: 1 }, Segment { mode: Mode::Numeric, begin: 1, end: 2 },]
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_not_kanji_2() {
|
||
// Note that it's implementation detail that the byte seq is split into
|
||
// two. Perhaps adjust the test to check for this.
|
||
let segs = parse(b"\xeb\xc0");
|
||
assert_eq!(
|
||
segs,
|
||
vec![Segment { mode: Mode::Byte, begin: 0, end: 1 }, Segment { mode: Mode::Byte, begin: 1, end: 2 },]
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_not_kanji_3() {
|
||
let segs = parse(b"\x81\x7f");
|
||
assert_eq!(
|
||
segs,
|
||
vec![Segment { mode: Mode::Byte, begin: 0, end: 1 }, Segment { mode: Mode::Byte, begin: 1, end: 2 },]
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_not_kanji_4() {
|
||
let segs = parse(b"\x81\x40\x81");
|
||
assert_eq!(
|
||
segs,
|
||
vec![Segment { mode: Mode::Kanji, begin: 0, end: 2 }, Segment { mode: Mode::Byte, begin: 2, end: 3 },]
|
||
);
|
||
}
|
||
}
|
||
|
||
//}}}
|
||
//------------------------------------------------------------------------------
|
||
//{{{ Optimizer
|
||
|
||
#[cfg_attr(feature = "cargo-clippy", allow(stutter))] // rust-lang-nursery/rust-clippy#2212 ಠ_ಠ
|
||
pub struct Optimizer<I> {
|
||
parser: I,
|
||
last_segment: Segment,
|
||
last_segment_size: usize,
|
||
version: Version,
|
||
ended: bool,
|
||
}
|
||
|
||
impl<I: Iterator<Item = Segment>> Optimizer<I> {
|
||
/// Optimize the segments by combining adjacent segments when possible.
|
||
///
|
||
/// Currently this method uses a greedy algorithm by combining segments from
|
||
/// left to right until the new segment is longer than before. This method
|
||
/// does *not* use Annex J from the ISO standard.
|
||
///
|
||
pub fn new(mut segments: I, version: Version) -> Self {
|
||
match segments.next() {
|
||
None => Self {
|
||
parser: segments,
|
||
last_segment: Segment { mode: Mode::Numeric, begin: 0, end: 0 },
|
||
last_segment_size: 0,
|
||
version,
|
||
ended: true,
|
||
},
|
||
Some(segment) => Self {
|
||
parser: segments,
|
||
last_segment: segment,
|
||
last_segment_size: segment.encoded_len(version),
|
||
version,
|
||
ended: false,
|
||
},
|
||
}
|
||
}
|
||
}
|
||
|
||
impl<'a> Parser<'a> {
|
||
pub fn optimize(self, version: Version) -> Optimizer<Parser<'a>> {
|
||
Optimizer::new(self, version)
|
||
}
|
||
}
|
||
|
||
impl<I: Iterator<Item = Segment>> Iterator for Optimizer<I> {
|
||
type Item = Segment;
|
||
|
||
fn next(&mut self) -> Option<Segment> {
|
||
if self.ended {
|
||
return None;
|
||
}
|
||
|
||
loop {
|
||
match self.parser.next() {
|
||
None => {
|
||
self.ended = true;
|
||
return Some(self.last_segment);
|
||
}
|
||
Some(segment) => {
|
||
let seg_size = segment.encoded_len(self.version);
|
||
|
||
let new_segment = Segment {
|
||
mode: self.last_segment.mode.max(segment.mode),
|
||
begin: self.last_segment.begin,
|
||
end: segment.end,
|
||
};
|
||
let new_size = new_segment.encoded_len(self.version);
|
||
|
||
if self.last_segment_size + seg_size >= new_size {
|
||
self.last_segment = new_segment;
|
||
self.last_segment_size = new_size;
|
||
} else {
|
||
let old_segment = self.last_segment;
|
||
self.last_segment = segment;
|
||
self.last_segment_size = seg_size;
|
||
return Some(old_segment);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Computes the total encoded length of all segments.
|
||
pub fn total_encoded_len(segments: &[Segment], version: Version) -> usize {
|
||
segments.iter().map(|seg| seg.encoded_len(version)).sum()
|
||
}
|
||
|
||
#[cfg(test)]
|
||
mod optimize_tests {
|
||
use optimize::{total_encoded_len, Optimizer, Segment};
|
||
use types::{Mode, Version};
|
||
|
||
fn test_optimization_result(given: Vec<Segment>, expected: Vec<Segment>, version: Version) {
|
||
let prev_len = total_encoded_len(&*given, version);
|
||
let opt_segs = Optimizer::new(given.iter().map(|seg| *seg), version).collect::<Vec<_>>();
|
||
let new_len = total_encoded_len(&*opt_segs, version);
|
||
if given != opt_segs {
|
||
assert!(prev_len > new_len, "{} > {}", prev_len, new_len);
|
||
}
|
||
assert!(
|
||
opt_segs == expected,
|
||
"Optimization gave something better: {} < {} ({:?})",
|
||
new_len,
|
||
total_encoded_len(&*expected, version),
|
||
opt_segs
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_example_1() {
|
||
test_optimization_result(
|
||
vec![
|
||
Segment { mode: Mode::Alphanumeric, begin: 0, end: 3 },
|
||
Segment { mode: Mode::Numeric, begin: 3, end: 6 },
|
||
Segment { mode: Mode::Byte, begin: 6, end: 10 },
|
||
],
|
||
vec![
|
||
Segment { mode: Mode::Alphanumeric, begin: 0, end: 6 },
|
||
Segment { mode: Mode::Byte, begin: 6, end: 10 },
|
||
],
|
||
Version::Normal(1),
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_example_2() {
|
||
test_optimization_result(
|
||
vec![
|
||
Segment { mode: Mode::Numeric, begin: 0, end: 29 },
|
||
Segment { mode: Mode::Alphanumeric, begin: 29, end: 30 },
|
||
Segment { mode: Mode::Numeric, begin: 30, end: 32 },
|
||
Segment { mode: Mode::Alphanumeric, begin: 32, end: 35 },
|
||
Segment { mode: Mode::Numeric, begin: 35, end: 38 },
|
||
],
|
||
vec![
|
||
Segment { mode: Mode::Numeric, begin: 0, end: 29 },
|
||
Segment { mode: Mode::Alphanumeric, begin: 29, end: 38 },
|
||
],
|
||
Version::Normal(9),
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_example_3() {
|
||
test_optimization_result(
|
||
vec![
|
||
Segment { mode: Mode::Kanji, begin: 0, end: 4 },
|
||
Segment { mode: Mode::Alphanumeric, begin: 4, end: 5 },
|
||
Segment { mode: Mode::Byte, begin: 5, end: 6 },
|
||
Segment { mode: Mode::Kanji, begin: 6, end: 8 },
|
||
],
|
||
vec![Segment { mode: Mode::Byte, begin: 0, end: 8 }],
|
||
Version::Normal(1),
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_example_4() {
|
||
test_optimization_result(
|
||
vec![Segment { mode: Mode::Kanji, begin: 0, end: 10 }, Segment { mode: Mode::Byte, begin: 10, end: 11 }],
|
||
vec![Segment { mode: Mode::Kanji, begin: 0, end: 10 }, Segment { mode: Mode::Byte, begin: 10, end: 11 }],
|
||
Version::Normal(1),
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_annex_j_guideline_1a() {
|
||
test_optimization_result(
|
||
vec![
|
||
Segment { mode: Mode::Numeric, begin: 0, end: 3 },
|
||
Segment { mode: Mode::Alphanumeric, begin: 3, end: 4 },
|
||
],
|
||
vec![
|
||
Segment { mode: Mode::Numeric, begin: 0, end: 3 },
|
||
Segment { mode: Mode::Alphanumeric, begin: 3, end: 4 },
|
||
],
|
||
Version::Micro(2),
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_annex_j_guideline_1b() {
|
||
test_optimization_result(
|
||
vec![
|
||
Segment { mode: Mode::Numeric, begin: 0, end: 2 },
|
||
Segment { mode: Mode::Alphanumeric, begin: 2, end: 4 },
|
||
],
|
||
vec![Segment { mode: Mode::Alphanumeric, begin: 0, end: 4 }],
|
||
Version::Micro(2),
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_annex_j_guideline_1c() {
|
||
test_optimization_result(
|
||
vec![
|
||
Segment { mode: Mode::Numeric, begin: 0, end: 3 },
|
||
Segment { mode: Mode::Alphanumeric, begin: 3, end: 4 },
|
||
],
|
||
vec![Segment { mode: Mode::Alphanumeric, begin: 0, end: 4 }],
|
||
Version::Micro(3),
|
||
);
|
||
}
|
||
}
|
||
|
||
#[cfg(feature = "bench")]
|
||
#[bench]
|
||
fn bench_optimize(bencher: &mut Bencher) {
|
||
use types::Version;
|
||
|
||
let data = b"QR\x83R\x81[\x83h\x81i\x83L\x83\x85\x81[\x83A\x81[\x83\x8b\x83R\x81[\x83h\x81j\
|
||
\x82\xc6\x82\xcd\x81A1994\x94N\x82\xc9\x83f\x83\x93\x83\\\x81[\x82\xcc\x8aJ\
|
||
\x94\xad\x95\x94\x96\xe5\x81i\x8c\xbb\x8d\xdd\x82\xcd\x95\xaa\x97\xa3\x82\xb5\x83f\
|
||
\x83\x93\x83\\\x81[\x83E\x83F\x81[\x83u\x81j\x82\xaa\x8aJ\x94\xad\x82\xb5\x82\xbd\
|
||
\x83}\x83g\x83\x8a\x83b\x83N\x83X\x8c^\x93\xf1\x8e\x9f\x8c\xb3\x83R\x81[\x83h\
|
||
\x82\xc5\x82\xa0\x82\xe9\x81B\x82\xc8\x82\xa8\x81AQR\x83R\x81[\x83h\x82\xc6\
|
||
\x82\xa2\x82\xa4\x96\xbc\x8f\xcc\x81i\x82\xa8\x82\xe6\x82\xd1\x92P\x8c\xea\x81j\
|
||
\x82\xcd\x83f\x83\x93\x83\\\x81[\x83E\x83F\x81[\x83u\x82\xcc\x93o\x98^\x8f\xa4\
|
||
\x95W\x81i\x91\xe64075066\x8d\x86\x81j\x82\xc5\x82\xa0\x82\xe9\x81BQR\x82\xcd\
|
||
Quick Response\x82\xc9\x97R\x97\x88\x82\xb5\x81A\x8d\x82\x91\xac\x93\xc7\x82\xdd\
|
||
\x8e\xe6\x82\xe8\x82\xaa\x82\xc5\x82\xab\x82\xe9\x82\xe6\x82\xa4\x82\xc9\x8aJ\
|
||
\x94\xad\x82\xb3\x82\xea\x82\xbd\x81B\x93\x96\x8f\x89\x82\xcd\x8e\xa9\x93\xae\
|
||
\x8e\xd4\x95\x94\x95i\x8dH\x8f\xea\x82\xe2\x94z\x91\x97\x83Z\x83\x93\x83^\x81[\
|
||
\x82\xc8\x82\xc7\x82\xc5\x82\xcc\x8eg\x97p\x82\xf0\x94O\x93\xaa\x82\xc9\x8aJ\
|
||
\x94\xad\x82\xb3\x82\xea\x82\xbd\x82\xaa\x81A\x8c\xbb\x8d\xdd\x82\xc5\x82\xcd\x83X\
|
||
\x83}\x81[\x83g\x83t\x83H\x83\x93\x82\xcc\x95\x81\x8by\x82\xc8\x82\xc7\x82\xc9\
|
||
\x82\xe6\x82\xe8\x93\xfa\x96{\x82\xc9\x8c\xc0\x82\xe7\x82\xb8\x90\xa2\x8aE\x93I\
|
||
\x82\xc9\x95\x81\x8by\x82\xb5\x82\xc4\x82\xa2\x82\xe9\x81B";
|
||
bencher.iter(|| Parser::new(data).optimize(Version::Normal(15)));
|
||
}
|
||
|
||
//}}}
|
||
//------------------------------------------------------------------------------
|
||
//{{{ Internal types and data for parsing
|
||
|
||
/// All values of `u8` can be split into 9 different character sets when
|
||
/// determining which encoding to use. This enum represents these groupings for
|
||
/// parsing purpose.
|
||
#[derive(Copy, Clone)]
|
||
enum ExclCharSet {
|
||
/// The end of string.
|
||
End = 0,
|
||
|
||
/// All symbols supported by the Alphanumeric encoding, i.e. space, `$`, `%`,
|
||
/// `*`, `+`, `-`, `.`, `/` and `:`.
|
||
Symbol = 1,
|
||
|
||
/// All numbers (0–9).
|
||
Numeric = 2,
|
||
|
||
/// All uppercase letters (A–Z). These characters may also appear in the
|
||
/// second byte of a Shift JIS 2-byte encoding.
|
||
Alpha = 3,
|
||
|
||
/// The first byte of a Shift JIS 2-byte encoding, in the range 0x81–0x9f.
|
||
KanjiHi1 = 4,
|
||
|
||
/// The first byte of a Shift JIS 2-byte encoding, in the range 0xe0–0xea.
|
||
KanjiHi2 = 5,
|
||
|
||
/// The first byte of a Shift JIS 2-byte encoding, of value 0xeb. This is
|
||
/// different from the other two range that the second byte has a smaller
|
||
/// range.
|
||
KanjiHi3 = 6,
|
||
|
||
/// The second byte of a Shift JIS 2-byte encoding, in the range 0x40–0xbf,
|
||
/// excluding letters (covered by `Alpha`), 0x81–0x9f (covered by `KanjiHi1`),
|
||
/// and the invalid byte 0x7f.
|
||
KanjiLo1 = 7,
|
||
|
||
/// The second byte of a Shift JIS 2-byte encoding, in the range 0xc0–0xfc,
|
||
/// excluding the range 0xe0–0xeb (covered by `KanjiHi2` and `KanjiHi3`).
|
||
/// This half of byte-pair cannot appear as the second byte leaded by
|
||
/// `KanjiHi3`.
|
||
KanjiLo2 = 8,
|
||
|
||
/// Any other values not covered by the above character sets.
|
||
Byte = 9,
|
||
}
|
||
|
||
impl ExclCharSet {
|
||
/// Determines which character set a byte is in.
|
||
fn from_u8(c: u8) -> Self {
|
||
match c {
|
||
0x20 | 0x24 | 0x25 | 0x2a | 0x2b | 0x2d...0x2f | 0x3a => ExclCharSet::Symbol,
|
||
0x30...0x39 => ExclCharSet::Numeric,
|
||
0x41...0x5a => ExclCharSet::Alpha,
|
||
0x81...0x9f => ExclCharSet::KanjiHi1,
|
||
0xe0...0xea => ExclCharSet::KanjiHi2,
|
||
0xeb => ExclCharSet::KanjiHi3,
|
||
0x40 | 0x5b...0x7e | 0x80 | 0xa0...0xbf => ExclCharSet::KanjiLo1,
|
||
0xc0...0xdf | 0xec...0xfc => ExclCharSet::KanjiLo2,
|
||
_ => ExclCharSet::Byte,
|
||
}
|
||
}
|
||
}
|
||
|
||
/// The current parsing state.
|
||
#[derive(Copy, Clone)]
|
||
enum State {
|
||
/// Just initialized.
|
||
Init = 0,
|
||
|
||
/// Inside a string that can be exclusively encoded as Numeric.
|
||
Numeric = 10,
|
||
|
||
/// Inside a string that can be exclusively encoded as Alphanumeric.
|
||
Alpha = 20,
|
||
|
||
/// Inside a string that can be exclusively encoded as 8-Bit Byte.
|
||
Byte = 30,
|
||
|
||
/// Just encountered the first byte of a Shift JIS 2-byte sequence of the
|
||
/// set `KanjiHi1` or `KanjiHi2`.
|
||
KanjiHi12 = 40,
|
||
|
||
/// Just encountered the first byte of a Shift JIS 2-byte sequence of the
|
||
/// set `KanjiHi3`.
|
||
KanjiHi3 = 50,
|
||
|
||
/// Inside a string that can be exclusively encoded as Kanji.
|
||
Kanji = 60,
|
||
}
|
||
|
||
/// What should the parser do after a state transition.
|
||
#[derive(Copy, Clone)]
|
||
enum Action {
|
||
/// The parser should do nothing.
|
||
Idle,
|
||
|
||
/// Push the current segment as a Numeric string, and reset the marks.
|
||
Numeric,
|
||
|
||
/// Push the current segment as an Alphanumeric string, and reset the marks.
|
||
Alpha,
|
||
|
||
/// Push the current segment as a 8-Bit Byte string, and reset the marks.
|
||
Byte,
|
||
|
||
/// Push the current segment as a Kanji string, and reset the marks.
|
||
Kanji,
|
||
|
||
/// Push the current segment excluding the last byte as a Kanji string, then
|
||
/// push the remaining single byte as a Byte string, and reset the marks.
|
||
KanjiAndSingleByte,
|
||
}
|
||
|
||
static STATE_TRANSITION: [(State, Action); 70] = [
|
||
// STATE_TRANSITION[current_state + next_character] == (next_state, what_to_do)
|
||
|
||
// Init state:
|
||
(State::Init, Action::Idle), // End
|
||
(State::Alpha, Action::Idle), // Symbol
|
||
(State::Numeric, Action::Idle), // Numeric
|
||
(State::Alpha, Action::Idle), // Alpha
|
||
(State::KanjiHi12, Action::Idle), // KanjiHi1
|
||
(State::KanjiHi12, Action::Idle), // KanjiHi2
|
||
(State::KanjiHi3, Action::Idle), // KanjiHi3
|
||
(State::Byte, Action::Idle), // KanjiLo1
|
||
(State::Byte, Action::Idle), // KanjiLo2
|
||
(State::Byte, Action::Idle), // Byte
|
||
// Numeric state:
|
||
(State::Init, Action::Numeric), // End
|
||
(State::Alpha, Action::Numeric), // Symbol
|
||
(State::Numeric, Action::Idle), // Numeric
|
||
(State::Alpha, Action::Numeric), // Alpha
|
||
(State::KanjiHi12, Action::Numeric), // KanjiHi1
|
||
(State::KanjiHi12, Action::Numeric), // KanjiHi2
|
||
(State::KanjiHi3, Action::Numeric), // KanjiHi3
|
||
(State::Byte, Action::Numeric), // KanjiLo1
|
||
(State::Byte, Action::Numeric), // KanjiLo2
|
||
(State::Byte, Action::Numeric), // Byte
|
||
// Alpha state:
|
||
(State::Init, Action::Alpha), // End
|
||
(State::Alpha, Action::Idle), // Symbol
|
||
(State::Numeric, Action::Alpha), // Numeric
|
||
(State::Alpha, Action::Idle), // Alpha
|
||
(State::KanjiHi12, Action::Alpha), // KanjiHi1
|
||
(State::KanjiHi12, Action::Alpha), // KanjiHi2
|
||
(State::KanjiHi3, Action::Alpha), // KanjiHi3
|
||
(State::Byte, Action::Alpha), // KanjiLo1
|
||
(State::Byte, Action::Alpha), // KanjiLo2
|
||
(State::Byte, Action::Alpha), // Byte
|
||
// Byte state:
|
||
(State::Init, Action::Byte), // End
|
||
(State::Alpha, Action::Byte), // Symbol
|
||
(State::Numeric, Action::Byte), // Numeric
|
||
(State::Alpha, Action::Byte), // Alpha
|
||
(State::KanjiHi12, Action::Byte), // KanjiHi1
|
||
(State::KanjiHi12, Action::Byte), // KanjiHi2
|
||
(State::KanjiHi3, Action::Byte), // KanjiHi3
|
||
(State::Byte, Action::Idle), // KanjiLo1
|
||
(State::Byte, Action::Idle), // KanjiLo2
|
||
(State::Byte, Action::Idle), // Byte
|
||
// KanjiHi12 state:
|
||
(State::Init, Action::KanjiAndSingleByte), // End
|
||
(State::Alpha, Action::KanjiAndSingleByte), // Symbol
|
||
(State::Numeric, Action::KanjiAndSingleByte), // Numeric
|
||
(State::Kanji, Action::Idle), // Alpha
|
||
(State::Kanji, Action::Idle), // KanjiHi1
|
||
(State::Kanji, Action::Idle), // KanjiHi2
|
||
(State::Kanji, Action::Idle), // KanjiHi3
|
||
(State::Kanji, Action::Idle), // KanjiLo1
|
||
(State::Kanji, Action::Idle), // KanjiLo2
|
||
(State::Byte, Action::KanjiAndSingleByte), // Byte
|
||
// KanjiHi3 state:
|
||
(State::Init, Action::KanjiAndSingleByte), // End
|
||
(State::Alpha, Action::KanjiAndSingleByte), // Symbol
|
||
(State::Numeric, Action::KanjiAndSingleByte), // Numeric
|
||
(State::Kanji, Action::Idle), // Alpha
|
||
(State::Kanji, Action::Idle), // KanjiHi1
|
||
(State::KanjiHi12, Action::KanjiAndSingleByte), // KanjiHi2
|
||
(State::KanjiHi3, Action::KanjiAndSingleByte), // KanjiHi3
|
||
(State::Kanji, Action::Idle), // KanjiLo1
|
||
(State::Byte, Action::KanjiAndSingleByte), // KanjiLo2
|
||
(State::Byte, Action::KanjiAndSingleByte), // Byte
|
||
// Kanji state:
|
||
(State::Init, Action::Kanji), // End
|
||
(State::Alpha, Action::Kanji), // Symbol
|
||
(State::Numeric, Action::Kanji), // Numeric
|
||
(State::Alpha, Action::Kanji), // Alpha
|
||
(State::KanjiHi12, Action::Idle), // KanjiHi1
|
||
(State::KanjiHi12, Action::Idle), // KanjiHi2
|
||
(State::KanjiHi3, Action::Idle), // KanjiHi3
|
||
(State::Byte, Action::Kanji), // KanjiLo1
|
||
(State::Byte, Action::Kanji), // KanjiLo2
|
||
(State::Byte, Action::Kanji), // Byte
|
||
];
|
||
|
||
//}}}
|