60 lines
2.1 KiB
Rust
60 lines
2.1 KiB
Rust
use epiphany_textproj::COMPANION_VERSION;
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fn title_page_version(source: &str) -> Result<(u32, u32, u32), String> {
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let title_page = source
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.split_once("\\begin{titlepage}")
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.and_then(|(_, after_start)| after_start.split_once("\\end{titlepage}"))
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.map(|(title_page, _)| title_page)
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.ok_or_else(|| "companion must contain one complete titlepage environment".to_owned())?;
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let candidates: Vec<_> = title_page
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.lines()
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.filter_map(|line| line.split_once("Version ").map(|(_, suffix)| suffix))
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.collect();
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if candidates.len() != 1 {
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return Err(format!(
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"title page must contain exactly one `Version <major>.<minor>.<patch>` anchor; found {}",
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candidates.len()
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));
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}
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let token: String = candidates[0]
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.chars()
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.take_while(|character| character.is_ascii_digit() || *character == '.')
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.collect();
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let components: Vec<_> = token.split('.').collect();
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if components.len() != 3 || components.iter().any(|component| component.is_empty()) {
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return Err(format!(
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"title-page version must have exactly three numeric components; found `{token}`"
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));
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}
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let parse_component = |component: &str| {
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component
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.parse::<u32>()
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.map_err(|_| format!("invalid numeric component `{component}` in title-page version"))
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};
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Ok((
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parse_component(components[0])?,
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parse_component(components[1])?,
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parse_component(components[2])?,
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))
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}
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#[test]
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fn companion_version_matches_title_page() {
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let companion_path = concat!(
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env!("CARGO_MANIFEST_DIR"),
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"/../../spec/text_projection.tex"
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);
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let companion = std::fs::read_to_string(companion_path)
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.unwrap_or_else(|error| panic!("failed to read {companion_path}: {error}"));
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let title_version = title_page_version(&companion)
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.unwrap_or_else(|error| panic!("failed to parse {companion_path}: {error}"));
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assert_eq!(
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title_version, COMPANION_VERSION,
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"title-page companion version differs from epiphany_textproj::COMPANION_VERSION"
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);
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}
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