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use crate::{model::Line, util::serialization};
use anyhow::{Error, Result};
use std::fmt;
use std::fs::File;
use std::io::{prelude::*, BufReader};
use std::path::Path;
#[derive(Debug, Clone)]
struct ParseError {
line: usize,
message: String,
}
impl fmt::Display for ParseError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "Line {}: {}", self.line, self.message)
}
}
impl std::error::Error for ParseError {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
None
}
}
pub fn read_file(path: &str) -> Result<Vec<Line>> {
let file = File::open(path)?;
let reader = BufReader::new(file);
let mut entries: Vec<Line> = Vec::new();
for (index, line) in reader.lines().enumerate() {
let line = line?;
if let Some(line) = read_line(index, &line)? {
entries.push(line)
}
}
Ok(entries)
}
fn read_line(index: usize, line: &str) -> Result<Option<Line>> {
let line = line.trim();
if line.starts_with('#') || line.is_empty() {
Ok(None)
} else if !line.starts_with('-') {
Err(Error::from(ParseError {
line: index + 1,
message: "an entry should starts with “-”.".to_string(),
}))
} else {
let without_minus = line.split('-').skip(1).collect::<Vec<&str>>().join("-");
let without_comment = without_minus.split('#').collect::<Vec<&str>>()[0].trim();
let translation = without_comment.split(':').collect::<Vec<&str>>();
if translation.len() != 2 {
Err(Error::from(ParseError {
line: index + 1,
message: "an entry should contain two parts separated by “:”.".to_string(),
}))
} else {
let t1 = translation[0].trim();
let t2 = translation[1].trim();
if t1.is_empty() || t2.is_empty() {
Err(Error::from(ParseError {
line: index + 1,
message: "an entry should contain two parts separated by “:”.".to_string(),
}))
} else {
Ok(Some(Line {
part_1: serialization::line_to_words(t1),
part_2: serialization::line_to_words(t2),
}))
}
}
}
}
pub fn pp_from_path(path: &str) -> Option<String> {
Some(capitalize(
Path::new(&path).with_extension("").file_name()?.to_str()?,
))
}
fn capitalize(s: &str) -> String {
let mut c = s.chars();
match c.next() {
None => String::new(),
Some(f) => f.to_uppercase().collect::<String>() + c.as_str(),
}
}
#[cfg(test)]
pub mod tests {
use crate::model::Line;
use anyhow::Result;
#[test]
fn errors() {
is_error("A : a");
is_error("- A");
is_error("- A -> a");
is_error("- A : B : C");
is_error("- : ");
is_error("- A : a\n-")
}
#[test]
fn ignored() {
check("", &[]);
check(" ", &[]);
check(" \n \n ", &[]);
check("# 1", &[]);
check("# 1\n\n # 2", &[]);
}
#[test]
fn card() {
check("- A : a", &[(&["A"], &["a"])]);
}
#[test]
fn cards() {
check("- A : a\n- B : b", &[(&["A"], &["a"]), (&["B"], &["b"])]);
}
#[test]
fn alternatives() {
check("- A : a1 | a2", &[(&["A"], &["a1", "a2"])]);
check("- A1 | A2 : a", &[(&["A1", "A2"], &["a"])]);
check("- A1 | A2 : a1 | a2", &[(&["A1", "A2"], &["a1", "a2"])]);
}
fn is_error(content: &str) {
assert!(read_string(content).is_err())
}
fn check(content: &str, res: &[(&[&str], &[&str])]) {
assert_eq!(
read_string(content).unwrap(),
res.iter()
.map(|(part_1, part_2)| Line {
part_1: part_1.iter().map(|x| x.to_string()).collect::<Vec<_>>(),
part_2: part_2.iter().map(|x| x.to_string()).collect::<Vec<_>>()
})
.collect::<Vec<_>>()
)
}
pub fn read_string(content: &str) -> Result<Vec<Line>> {
let mut entries: Vec<Line> = Vec::new();
for (index, line) in content.lines().enumerate() {
if let Some(line) = super::read_line(index, line)? {
entries.push(line)
}
}
Ok(entries)
}
}
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