From: Ruben Beltran del Rio Date: Sat, 4 Jan 2025 22:04:42 +0000 (+0100) Subject: Add the library X-Git-Tag: 1.0.0~3 X-Git-Url: https://git.r.bdr.sh/rbdr/gema_texto/commitdiff_plain/8beb2bfa1af988442550c9e6999d924dd14b5236?ds=inline Add the library --- 8beb2bfa1af988442550c9e6999d924dd14b5236 diff --git a/.build.yml b/.build.yml new file mode 100644 index 0000000..66f066d --- /dev/null +++ b/.build.yml @@ -0,0 +1,20 @@ +image: archlinux +packages: + - make + - coreutils + - lld + - rustup +sources: + - git@git.sr.ht:~rbdr/gema_texto +secrets: + - 89d3b676-25d6-4942-8231-38b73aa62bf6 + - 4b8a54f9-66fc-4227-8d3c-6f4940207d91 +tasks: + - set_rust: | + cd gema_texto + make set_rust + - install_coverage_tool: | + cargo install cargo-tarpaulin + - package: | + cd gema_texto + make ci diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..0592392 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +/target +.DS_Store diff --git a/Cargo.lock b/Cargo.lock new file mode 100644 index 0000000..daf6010 --- /dev/null +++ b/Cargo.lock @@ -0,0 +1,7 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +version = 4 + +[[package]] +name = "gema_texto" +version = "1.0.0" diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..04e4283 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,13 @@ +[package] +name = "gema_texto" +version = "1.0.0" +edition = "2021" +license = "AGPL-3.0-or-later" +description = "Library to parse gemtext and render HTML" +homepage = "https://git.sr.ht/~rbdr/gema_texto" +authors = ["Rubén Beltrán del Río "] + +[dependencies] + +[lints.clippy] +pedantic = "warn" diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..6e80594 --- /dev/null +++ b/LICENSE @@ -0,0 +1,661 @@ +GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + gema_teto, a gemini parser and html renderer. + Copyright (C) 2024 Ruben Beltran del Rio + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU Affero General Public License as published + by the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License + along with this program. If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..f08d153 --- /dev/null +++ b/Makefile @@ -0,0 +1,37 @@ +profile := dev +target = $(shell rustc -vV | grep host | awk '{print $$2}') +architectures := x86_64-unknown-linux-gnu aarch64-unknown-linux-gnu +app_name := page + +default: build + +set_rust: + rustup default stable + +prepare: + rustup target add $(target) + +build: prepare + cargo build --profile $(profile) --target $(target) + +test: + cargo test + +coverage: + cargo tarpaulin --fail-under 100 + +format: + cargo fmt && cargo clippy --fix + +lint: + cargo fmt -- --check && cargo clippy + +release: + cargo publish + +ci: lint coverage +ifneq (,$(findstring refs/tags/,$(GIT_REF))) + $(MAKE) release +endif + +.PHONY: default set_rust prepare build test coverage format lint release ci diff --git a/README.md b/README.md new file mode 100644 index 0000000..7497cf1 --- /dev/null +++ b/README.md @@ -0,0 +1,35 @@ +# gema_texto + +`gema_texto` parses gemtext and renders html. + +This library powers [blog](https://r.bdr.sh/blog.html) and +[page](https://r.bdr.sh/page.html), so it makes some decisions on +for those projects. Here's how each line is handled: + +- Headings and the content under them is wrapped in a `
` tag. +- All text lines are `

`, even empty ones. +- URLs are wrapped in a `

` +- Alt Text is supported for preformatted-toggles, and is written as + the aria-label of the `

` tag.
+- Consecutive list items are wrapped in a `
    ` and rendered as `
  • ` tags. +- Quotes are wrapped in a single `
    ` + +# Usage + +More in-depth usage docs in the source. This is an overview of the included +functionality. + +- `gemini_parser` deals with parsing the gemini file itself. +- `html_renderer` takes a parsed gemini file and renders it to html. + +## `gema_texto::gemini_parser::GeminiLine` + +An `enum` that represents the six different types of lines in gemtext. + +## `gema_texto::gemini_parser::parse` + +Parses a `&str` of gemtext source and returns a `Vec`. + +## `gema_texto::html_renderer::render_html` + +Renders a `Vec` into some html `String` diff --git a/src/gemini_parser.rs b/src/gemini_parser.rs new file mode 100644 index 0000000..6d19092 --- /dev/null +++ b/src/gemini_parser.rs @@ -0,0 +1,331 @@ +#[derive(PartialEq, Eq, Debug)] + +/// Represents one of the six line types in gemtext. +/// +/// # Examples +/// ``` +/// use gema_texto::gemini_parser::GeminiLine; +/// use gema_texto::gemini_parser::parse; +/// +/// let gemini_source = "\ +/// # Hello +/// This is some gemini text! +/// => https://test Go to the test page. +/// +/// This text actually has more linkes +/// => https://test2 Go to the second test page. +/// => https://test3 Go to the third test page. +/// "; +/// +/// let gemini_lines = parse(&gemini_source); +/// // Count the number of links +/// let link_count = gemini_lines.iter() +/// .filter(|line| matches!(line, GeminiLine::Link(_, _))) +/// .count(); +/// assert_eq!(link_count, 3); +/// ``` +pub enum GeminiLine { + /// Text line, with a bool that shows whether it's preformatted. + Text(String, bool), + + /// Preformatted toggle line with alt text. + /// + /// The boolean indicates whether it turned preformatted mode on or off. + /// The string is the optional alt-text. + PreformattedToggle(bool, String), + + /// Heading with a number between 1 and 3 inclusive indicating level. + Heading(u8, String), + + /// Link with URL and text. + Link(String, String), + + /// Quote + Quote(String), + + /// List item + ListItem(String), +} + +/// Parses gemtext source code into a vector of `GeminiLine` elements. +/// +/// # Arguments +/// * `source` - A string slice that contains the gemtext +/// +/// # Returns +/// A `Vec` containing the rendered HTML. +/// +/// # Examples +/// +/// ``` +/// use std::fs::read_to_string; +/// use gema_texto::gemini_parser::parse; +/// let gemini_source = "\ +/// # Hello +/// This is some gemini text! +/// => https://test Go to the test page. +/// "; +/// +/// let gemini_lines = parse(&gemini_source); +/// +/// // Prints the different lines in the array. +/// for line in gemini_lines { +/// println!("{:#?}", line); +/// } +/// ``` +#[must_use] +pub fn parse(source: &str) -> Vec { + source + .lines() + .fold((Vec::new(), false), |(mut lines, is_preformatted), line| { + let parsed = if is_preformatted { + parse_preformatted_line(line) + } else { + parse_line(line) + }; + + let new_is_preformatted = match parsed { + GeminiLine::PreformattedToggle(x, _) => x, + _ => is_preformatted, + }; + + lines.push(parsed); + (lines, new_is_preformatted) + }) + .0 +} + +fn parse_preformatted_line(line: &str) -> GeminiLine { + match line { + s if s.starts_with("```") => GeminiLine::PreformattedToggle(false, String::new()), + _ => GeminiLine::Text(line.to_string(), true), + } +} + +fn parse_line(line: &str) -> GeminiLine { + match line { + s if s.starts_with("###") => GeminiLine::Heading(3, s[3..].to_string()), + s if s.starts_with("##") => GeminiLine::Heading(2, s[2..].to_string()), + s if s.starts_with('#') => GeminiLine::Heading(1, s[1..].to_string()), + s if s.starts_with("=>") => { + let content = s[2..].trim(); + match content.split_once(char::is_whitespace) { + Some((url, text)) => { + GeminiLine::Link(url.trim().to_string(), text.trim().to_string()) + } + None => GeminiLine::Link(content.trim().to_string(), String::new()), + } + } + s if s.starts_with("* ") => GeminiLine::ListItem(s[2..].to_string()), + s if s.starts_with('>') => GeminiLine::Quote(s[1..].to_string()), + s if s.starts_with("```") => GeminiLine::PreformattedToggle(true, s[3..].to_string()), + _ => GeminiLine::Text(line.to_string(), false), + } +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn test_headings() { + assert_eq!( + parse_line("### Heading"), + GeminiLine::Heading(3, " Heading".to_string()) + ); + assert_eq!( + parse_line("## Heading"), + GeminiLine::Heading(2, " Heading".to_string()) + ); + assert_eq!( + parse_line("# Heading"), + GeminiLine::Heading(1, " Heading".to_string()) + ); + assert_eq!(parse_line("###"), GeminiLine::Heading(3, String::new())); + assert_eq!( + parse_line("#####"), + GeminiLine::Heading(3, "##".to_string()) + ); + assert_eq!(parse_line("# "), GeminiLine::Heading(1, " ".to_string())); + + assert_eq!( + parse_preformatted_line("### Heading"), + GeminiLine::Text("### Heading".to_string(), true) + ); + assert_eq!( + parse_preformatted_line("## Heading"), + GeminiLine::Text("## Heading".to_string(), true) + ); + assert_eq!( + parse_preformatted_line("# Heading"), + GeminiLine::Text("# Heading".to_string(), true) + ); + } + + #[test] + fn test_links() { + assert_eq!( + parse_line("=> https://example.com Link text"), + GeminiLine::Link("https://example.com".to_string(), "Link text".to_string()) + ); + assert_eq!( + parse_line("=> /local/path"), + GeminiLine::Link("/local/path".to_string(), String::new()) + ); + + assert_eq!( + parse_line("=>"), + GeminiLine::Link(String::new(), String::new()) + ); + assert_eq!( + parse_line("=> "), + GeminiLine::Link(String::new(), String::new()) + ); + assert_eq!( + parse_line("=> multiple spaces in text"), + GeminiLine::Link("multiple".to_string(), "spaces in text".to_string()) + ); + + assert_eq!( + parse_preformatted_line("=> https://example.com Link text"), + GeminiLine::Text("=> https://example.com Link text".to_string(), true) + ); + } + + #[test] + fn test_list_items() { + assert_eq!( + parse_line("* List item"), + GeminiLine::ListItem("List item".to_string()) + ); + + assert_eq!(parse_line("* "), GeminiLine::ListItem(String::new())); + assert_eq!(parse_line("*"), GeminiLine::Text("*".to_string(), false)); + assert_eq!( + parse_line("*WithText"), + GeminiLine::Text("*WithText".to_string(), false) + ); + assert_eq!( + parse_line("* Multiple spaces"), + GeminiLine::ListItem(" Multiple spaces".to_string()) + ); + } + + #[test] + fn test_quotes() { + assert_eq!( + parse_line(">Quote text"), + GeminiLine::Quote("Quote text".to_string()) + ); + + assert_eq!(parse_line(">"), GeminiLine::Quote(String::new())); + assert_eq!(parse_line("> "), GeminiLine::Quote(" ".to_string())); + assert_eq!( + parse_line(">>Nested"), + GeminiLine::Quote(">Nested".to_string()) + ); + } + + #[test] + fn test_preformatted() { + assert_eq!( + parse_line("```alt-text"), + GeminiLine::PreformattedToggle(true, "alt-text".to_string()) + ); + + assert_eq!( + parse_line("```"), + GeminiLine::PreformattedToggle(true, String::new()) + ); + assert_eq!( + parse_line("``` "), + GeminiLine::PreformattedToggle(true, " ".to_string()) + ); + assert_eq!( + parse_line("````"), + GeminiLine::PreformattedToggle(true, "`".to_string()) + ); + + assert_eq!( + parse_preformatted_line("```alt-text"), + GeminiLine::PreformattedToggle(false, String::new()) + ); + assert_eq!( + parse_preformatted_line("```"), + GeminiLine::PreformattedToggle(false, String::new()) + ); + } + + #[test] + fn test_text() { + // Normal case + assert_eq!( + parse_line("Regular text"), + GeminiLine::Text("Regular text".to_string(), false) + ); + + // Edge cases + assert_eq!(parse_line(""), GeminiLine::Text(String::new(), false)); + assert_eq!(parse_line(" "), GeminiLine::Text(" ".to_string(), false)); + assert_eq!(parse_line(" "), GeminiLine::Text(" ".to_string(), false)); + } + + #[test] + fn test_malformed_input() { + assert_eq!( + parse_line("= >Not a link"), + GeminiLine::Text("= >Not a link".to_string(), false) + ); + assert_eq!( + parse_line("``Not preformatted"), + GeminiLine::Text("``Not preformatted".to_string(), false) + ); + assert_eq!( + parse_line("** Not a list"), + GeminiLine::Text("** Not a list".to_string(), false) + ); + } + + #[test] + fn test_full_document() { + let input = "\ +# Heading 1 +## Heading 2 +### Heading 3 +Regular text +=> https://example.com Link text +* List item +>Quote +```alt +code +# Heading 1 +## Heading 2 +### Heading 3 +=> https://example.com Link text +* List item +>Quote +```trailing alt"; + let result = parse(input); + assert_eq!( + result, + vec![ + GeminiLine::Heading(1, " Heading 1".to_string()), + GeminiLine::Heading(2, " Heading 2".to_string()), + GeminiLine::Heading(3, " Heading 3".to_string()), + GeminiLine::Text("Regular text".to_string(), false), + GeminiLine::Link("https://example.com".to_string(), "Link text".to_string()), + GeminiLine::ListItem("List item".to_string()), + GeminiLine::Quote("Quote".to_string()), + GeminiLine::PreformattedToggle(true, "alt".to_string()), + GeminiLine::Text("code".to_string(), true), + GeminiLine::Text("# Heading 1".to_string(), true), + GeminiLine::Text("## Heading 2".to_string(), true), + GeminiLine::Text("### Heading 3".to_string(), true), + GeminiLine::Text("=> https://example.com Link text".to_string(), true), + GeminiLine::Text("* List item".to_string(), true), + GeminiLine::Text(">Quote".to_string(), true), + GeminiLine::PreformattedToggle(false, String::new()), + ] + ); + } +} diff --git a/src/html_renderer.rs b/src/html_renderer.rs new file mode 100644 index 0000000..e513533 --- /dev/null +++ b/src/html_renderer.rs @@ -0,0 +1,274 @@ +use crate::gemini_parser::GeminiLine; + +/// Renders HTML from a vector of `GeminiLine` elements. +/// +/// # Arguments +/// * `lines` - Vector of `GeminiLine` elements to render +/// +/// # Returns +/// A String containing the rendered HTML. +/// +/// # Examples +/// ``` +/// use std::fs::read_to_string; +/// use gema_texto::gemini_parser::parse; +/// use gema_texto::html_renderer::render_html; +/// +/// let gemini_source = "\ +/// # Hello +/// This is some gemini text! +/// => https://test Go to the test page. +/// "; +/// +/// let gemini_lines = parse(&gemini_source); +/// let html_source = render_html(&gemini_lines); +/// println!("{html_source}"); +/// ``` +#[must_use] +pub fn render_html(lines: &[GeminiLine]) -> String { + let mut heading_stack = Vec::new(); + let mut last_line: Option<&GeminiLine> = None; + let mut result = String::new(); + + for line in lines { + result.push_str(&line_preamble(line, last_line, &mut heading_stack)); + result.push_str(&line_content(line)); + result.push('\n'); + last_line = Some(line); + } + + result.push_str(&finalize_html(&heading_stack, last_line)); + result +} + +fn line_preamble( + line: &GeminiLine, + last_line: Option<&GeminiLine>, + heading_stack: &mut Vec, +) -> String { + let mut html = String::new(); + + if let Some(last_line) = last_line { + match last_line { + GeminiLine::ListItem(_) => match line { + GeminiLine::ListItem(_) => {} + _ => html.push_str("
\n"), + }, + GeminiLine::Quote(_) => match line { + GeminiLine::Quote(_) => {} + _ => html.push_str("\n"), + }, + _ => {} + } + } + + match line { + GeminiLine::Heading(level, _) => { + while let Some(open_heading) = heading_stack.pop() { + // You just encountered a more important heading. + // Put it back. Desist. + if open_heading < *level { + heading_stack.push(open_heading); + break; + } + + html.push_str("
\n"); + + if open_heading == *level { + break; + } + } + heading_stack.push(*level); + html.push_str(&format!("
\n")); + } + GeminiLine::ListItem(_) => match last_line { + Some(GeminiLine::ListItem(_)) => {} + _ => html.push_str("
    \n"), + }, + GeminiLine::Quote(_) => match last_line { + Some(GeminiLine::Quote(_)) => {} + _ => html.push_str("
    \n"), + }, + _ => {} + } + + html +} + +fn line_content(line: &GeminiLine) -> String { + match line { + GeminiLine::Text(content, false) => format!("

    {content}

    "), + GeminiLine::Link(url, text) => { + let display = if text.is_empty() { url } else { text }; + format!("

    {display}

    ") + } + GeminiLine::Heading(level, content) => format!("{content}"), + GeminiLine::ListItem(content) => format!("
  • {content}
  • "), + GeminiLine::PreformattedToggle(true, alt_text) => { + format!("
    ")
    +        }
    +        GeminiLine::PreformattedToggle(false, _) => "
    ".to_string(), + GeminiLine::Text(content, true) | GeminiLine::Quote(content) => content.to_string(), + } +} + +fn finalize_html(heading_stack: &[u8], last_line: Option<&GeminiLine>) -> String { + let mut html = String::new(); + + match last_line { + Some(GeminiLine::ListItem(_)) => html.push_str("
\n"), + Some(GeminiLine::Quote(_)) => html.push_str("\n"), + _ => {} + } + + for _ in heading_stack { + html.push_str("
\n"); + } + + html +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn test_simple_text() { + let input = vec![GeminiLine::Text("Hello world".to_string(), false)]; + assert_eq!(render_html(&input), "

Hello world

\n"); + } + + #[test] + fn test_heading_nesting() { + let input = vec![ + GeminiLine::Heading(1, "Top".to_string()), + GeminiLine::Heading(2, "Sub".to_string()), + GeminiLine::Heading(3, "SubSub".to_string()), + GeminiLine::Heading(2, "Another Sub".to_string()), + ]; + assert_eq!( + render_html(&input), + "
\n\ +

Top

\n\ +
\n\ +

Sub

\n\ +
\n\ +

SubSub

\n\ +
\n\ +
\n\ +
\n\ +

Another Sub

\n\ +
\n\ +
\n" + ); + } + + #[test] + fn test_list_transitions() { + let input = vec![ + GeminiLine::ListItem("First".to_string()), + GeminiLine::ListItem("Second".to_string()), + GeminiLine::Text("Break".to_string(), false), + GeminiLine::ListItem("New list".to_string()), + ]; + assert_eq!( + render_html(&input), + "
    \n\ +
  • First
  • \n\ +
  • Second
  • \n\ +
\n\ +

Break

\n\ +
    \n\ +
  • New list
  • \n\ +
\n" + ); + } + + #[test] + fn test_quote_transitions() { + let input = vec![ + GeminiLine::Quote("First quote".to_string()), + GeminiLine::Quote("Still quoting".to_string()), + GeminiLine::Text("Normal text".to_string(), false), + GeminiLine::Quote("New quote".to_string()), + ]; + assert_eq!( + render_html(&input), + "
\n\ + First quote\n\ + Still quoting\n\ +
\n\ +

Normal text

\n\ +
\n\ + New quote\n\ +
\n" + ); + } + + #[test] + fn test_preformatted() { + let input = vec![ + GeminiLine::PreformattedToggle(true, "code".to_string()), + GeminiLine::Text("let x = 42;".to_string(), true), + GeminiLine::PreformattedToggle(false, String::new()), + ]; + assert_eq!( + render_html(&input), + "
\n\
+             let x = 42;\n\
+             
\n" + ); + } + + #[test] + fn test_links() { + let input = vec![ + GeminiLine::Link("https://example.com".to_string(), "Example".to_string()), + GeminiLine::Link("https://rust-lang.org".to_string(), String::new()), + ]; + assert_eq!( + render_html(&input), + "

Example

\n\ +

https://rust-lang.org

\n" + ); + } + + #[test] + fn test_complex_nesting() { + let input = vec![ + GeminiLine::Heading(1, "Title".to_string()), + GeminiLine::Text("Intro".to_string(), false), + GeminiLine::Heading(2, "Section".to_string()), + GeminiLine::ListItem("Point 1".to_string()), + GeminiLine::ListItem("Point 2".to_string()), + GeminiLine::Quote("Important quote".to_string()), + GeminiLine::Heading(2, "Another Section".to_string()), + ]; + assert_eq!( + render_html(&input), + "
\n\ +

Title

\n\ +

Intro

\n\ +
\n\ +

Section

\n\ +
    \n\ +
  • Point 1
  • \n\ +
  • Point 2
  • \n\ +
\n\ +
\n\ + Important quote\n\ +
\n\ +
\n\ +
\n\ +

Another Section

\n\ +
\n\ +
\n" + ); + } + + #[test] + fn test_empty_input() { + let input = Vec::new(); + assert_eq!(render_html(&input), ""); + } +} diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..53acfcf --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,16 @@ +//! `gema_texto` parses gemtext and renders html. +//! +//! This library powers [blog](https://r.bdr.sh/blog.html) and +//! [page](https://r.bdr.sh/page.html), so it makes some decisions on +//! for those projects. Here's how each line is handled: +//! +//! - Headings and the content under them is wrapped in a `
` tag. +//! - All text lines are `

`, even empty ones. +//! - URLs are wrapped in a `

` +//! - Alt Text is supported for preformatted-toggles, and is written as +//! the aria-label of the `

` tag.
+//! - Consecutive list items are wrapped in a `
    ` and rendered as `
  • ` tags. +//! - Quotes are wrapped in a single `
    ` +//! +pub mod gemini_parser; +pub mod html_renderer;