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|
use std::path::Path;
use std::str::FromStr;
use lazy_static::lazy_static;
use regex::Regex;
use crate::common::{Codepoint, CodepointIter, UcdFile, UcdFileByCodepoint};
use crate::error::Error;
/// Represents a single row in the `ArabicShaping.txt` file.
///
/// The field names were taken from the header of ArabicShaping.txt.
#[derive(Clone, Debug, Default, Eq, PartialEq)]
pub struct ArabicShaping {
/// The codepoint corresponding to this row.
pub codepoint: Codepoint,
/// A short schematic name for the codepoint.
///
/// The schematic name is descriptive of the shape, based as consistently as
/// possible on a name for the skeleton and then the diacritic marks applied
/// to the skeleton, if any. Note that this schematic name is considered a
/// comment, and does not constitute a formal property value.
pub schematic_name: String,
/// The "joining type" of this codepoint.
pub joining_type: JoiningType,
/// The "joining group" of this codepoint.
pub joining_group: String,
}
/// The Joining_Type field read from ArabicShaping.txt
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum JoiningType {
RightJoining,
LeftJoining,
DualJoining,
JoinCausing,
NonJoining,
Transparent,
}
impl JoiningType {
pub fn as_str(&self) -> &str {
match self {
JoiningType::RightJoining => "R",
JoiningType::LeftJoining => "L",
JoiningType::DualJoining => "D",
JoiningType::JoinCausing => "C",
JoiningType::NonJoining => "U",
JoiningType::Transparent => "T",
}
}
}
impl Default for JoiningType {
fn default() -> JoiningType {
JoiningType::NonJoining
}
}
impl FromStr for JoiningType {
type Err = Error;
fn from_str(s: &str) -> Result<JoiningType, Error> {
match s {
"R" => Ok(JoiningType::RightJoining),
"L" => Ok(JoiningType::LeftJoining),
"D" => Ok(JoiningType::DualJoining),
"C" => Ok(JoiningType::JoinCausing),
"U" => Ok(JoiningType::NonJoining),
"T" => Ok(JoiningType::Transparent),
_ => err!(
"unrecognized joining type: '{}' \
(must be one of R, L, D, C, U or T)",
s
),
}
}
}
impl UcdFile for ArabicShaping {
fn relative_file_path() -> &'static Path {
Path::new("ArabicShaping.txt")
}
}
impl UcdFileByCodepoint for ArabicShaping {
fn codepoints(&self) -> CodepointIter {
self.codepoint.into_iter()
}
}
impl FromStr for ArabicShaping {
type Err = Error;
fn from_str(line: &str) -> Result<ArabicShaping, Error> {
lazy_static! {
static ref PARTS: Regex = Regex::new(
r"(?x)
^
\s*(?P<codepoint>[A-F0-9]+)\s*;
\s*(?P<name>[^;]+)\s*;
\s*(?P<joining_type>[^;]+)\s*;
\s*(?P<joining_group>[^;]+)
$
"
)
.unwrap();
};
let caps = match PARTS.captures(line.trim()) {
Some(caps) => caps,
None => return err!("invalid ArabicShaping line"),
};
Ok(ArabicShaping {
codepoint: caps["codepoint"].parse()?,
schematic_name: caps["name"].to_string(),
joining_type: caps["joining_type"].parse()?,
joining_group: caps["joining_group"].to_string(),
})
}
}
#[cfg(test)]
mod tests {
use crate::common::Codepoint;
use super::{ArabicShaping, JoiningType};
fn codepoint(n: u32) -> Codepoint {
Codepoint::from_u32(n).unwrap()
}
fn s(string: &str) -> String {
string.to_string()
}
#[test]
fn parse1() {
let line = "0600; ARABIC NUMBER SIGN; U; No_Joining_Group\n";
let data: ArabicShaping = line.parse().unwrap();
assert_eq!(
data,
ArabicShaping {
codepoint: codepoint(0x0600),
schematic_name: s("ARABIC NUMBER SIGN"),
joining_type: JoiningType::NonJoining,
joining_group: s("No_Joining_Group")
}
);
}
#[test]
fn parse2() {
let line = "063D; FARSI YEH WITH INVERTED V ABOVE; D; FARSI YEH\n";
let data: ArabicShaping = line.parse().unwrap();
assert_eq!(
data,
ArabicShaping {
codepoint: codepoint(0x063D),
schematic_name: s("FARSI YEH WITH INVERTED V ABOVE"),
joining_type: JoiningType::DualJoining,
joining_group: s("FARSI YEH")
}
);
}
#[test]
fn parse3() {
let line =
"10D23; HANIFI ROHINGYA DOTLESS KINNA YA WITH DOT ABOVE; D; HANIFI ROHINGYA KINNA YA\n";
let data: ArabicShaping = line.parse().unwrap();
assert_eq!(
data,
ArabicShaping {
codepoint: codepoint(0x10D23),
schematic_name: s(
"HANIFI ROHINGYA DOTLESS KINNA YA WITH DOT ABOVE"
),
joining_type: JoiningType::DualJoining,
joining_group: s("HANIFI ROHINGYA KINNA YA")
}
);
}
}
|
