Initial Commit
This commit is contained in:
Nathan Fisher
commit
e9ff1c9e87
6 changed files with 336 additions and 0 deletions
1
.gitignore
vendored
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1
.gitignore
vendored
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@ -0,0 +1 @@
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/target
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95
Cargo.lock
generated
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95
Cargo.lock
generated
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@ -0,0 +1,95 @@
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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version = 3
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[[package]]
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name = "gemtext-rs"
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version = "0.1.0"
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dependencies = [
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"serde",
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"textwrap",
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]
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[[package]]
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name = "proc-macro2"
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version = "1.0.79"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "e835ff2298f5721608eb1a980ecaee1aef2c132bf95ecc026a11b7bf3c01c02e"
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dependencies = [
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"unicode-ident",
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]
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[[package]]
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name = "quote"
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version = "1.0.35"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
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dependencies = [
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"proc-macro2",
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]
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[[package]]
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name = "serde"
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version = "1.0.197"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "3fb1c873e1b9b056a4dc4c0c198b24c3ffa059243875552b2bd0933b1aee4ce2"
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dependencies = [
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"serde_derive",
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]
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[[package]]
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name = "serde_derive"
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version = "1.0.197"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "7eb0b34b42edc17f6b7cac84a52a1c5f0e1bb2227e997ca9011ea3dd34e8610b"
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dependencies = [
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"proc-macro2",
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"quote",
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"syn",
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]
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[[package]]
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name = "smawk"
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version = "0.3.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "b7c388c1b5e93756d0c740965c41e8822f866621d41acbdf6336a6a168f8840c"
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[[package]]
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name = "syn"
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version = "2.0.58"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "44cfb93f38070beee36b3fef7d4f5a16f27751d94b187b666a5cc5e9b0d30687"
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dependencies = [
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"proc-macro2",
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"quote",
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"unicode-ident",
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]
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[[package]]
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name = "textwrap"
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version = "0.16.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "23d434d3f8967a09480fb04132ebe0a3e088c173e6d0ee7897abbdf4eab0f8b9"
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dependencies = [
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"smawk",
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"unicode-linebreak",
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"unicode-width",
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]
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[[package]]
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name = "unicode-ident"
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version = "1.0.12"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
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[[package]]
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name = "unicode-linebreak"
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version = "0.1.5"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "3b09c83c3c29d37506a3e260c08c03743a6bb66a9cd432c6934ab501a190571f"
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[[package]]
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name = "unicode-width"
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version = "0.1.11"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "e51733f11c9c4f72aa0c160008246859e340b00807569a0da0e7a1079b27ba85"
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13
Cargo.toml
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13
Cargo.toml
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@ -0,0 +1,13 @@
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[package]
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name = "gemtext-rs"
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[features]
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serde = ["dep:serde"]
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[dependencies]
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serde = { version = "1.0.197", optional = true }
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textwrap = "0.16.1"
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6
src/lib.rs
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6
src/lib.rs
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@ -0,0 +1,6 @@
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#![warn(clippy::all, clippy::pedantic)]
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mod node;
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mod parser;
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pub use {node::Node, parser::Parser};
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103
src/node.rs
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103
src/node.rs
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@ -0,0 +1,103 @@
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use std::fmt::{self, Write};
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#[cfg(feature = "serde")]
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use serde::{Deserialize, Serialize};
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#[derive(Clone, Debug, PartialEq)]
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#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
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pub enum Node {
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Text(String),
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H1(String),
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H2(String),
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H3(String),
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ListItem(String),
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Quote(String),
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PreStart {
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alt: Option<String>,
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},
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PreBody(String),
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PreEnd,
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Link {
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url: String,
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display: Option<String>,
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},
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Prompt {
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url: String,
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display: Option<String>,
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},
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}
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impl fmt::Display for Node {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self {
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Self::Text(s) | Self::PreBody(s) => writeln!(f, "{s}"),
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Self::H1(s) => writeln!(f, "# {s}"),
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Self::H2(s) => writeln!(f, "## {s}"),
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Self::H3(s) => writeln!(f, "### {s}"),
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Self::ListItem(s) => writeln!(f, "* {s}"),
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Self::Quote(s) => writeln!(f, "> {s}"),
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Self::PreStart { alt } => match alt {
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Some(s) => writeln!(f, "```{s}"),
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None => writeln!(f, "```"),
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},
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Self::PreEnd => writeln!(f, "```"),
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Self::Link {
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url,
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display: Some(display),
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} => writeln!(f, "=> {url} {display}"),
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Self::Link { url, display: None } => writeln!(f, "=> {url}"),
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Self::Prompt {
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url,
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display: Some(display),
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} => writeln!(f, "=: {url} {display}"),
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Self::Prompt { url, display: None } => writeln!(f, "=: {url}"),
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}
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}
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}
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impl Node {
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pub fn write_html<W: Write>(&self, mut writer: W) -> fmt::Result {
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match self {
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Self::Text(s) => {
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writeln!(writer, "<p>")?;
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textwrap::wrap(s, 80)
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.into_iter()
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.try_for_each(|line| writeln!(writer, "{line}"))?;
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writeln!(writer, "</p>")
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}
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Self::H1(s) => writeln!(writer, "<h1>{s}</h1>"),
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Self::H2(s) => writeln!(writer, "<h2>{s}</h3>"),
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Self::H3(s) => writeln!(writer, "<h3>{s}</h3>"),
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Self::ListItem(s) => {
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write!(writer, "<li>")?;
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textwrap::wrap(s, 80)
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.iter()
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.try_for_each(|line| write!(writer, "{line}"))?;
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writeln!(writer, "</li>")
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}
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Self::Quote(s) => {
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write!(writer, "<blockquote>")?;
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textwrap::wrap(s, 80)
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.iter()
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.try_for_each(|line| writeln!(writer, "{line}"))?;
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writeln!(writer, "</blockquote>")
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}
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Self::PreStart { alt: Some(s) } => {
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writeln!(writer, "<pre title=\"{s}\">")
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}
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Self::PreStart { alt: None } => writeln!(writer, "<pre>"),
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Self::PreBody(s) => writeln!(writer, "{s}"),
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Self::PreEnd => writeln!(writer, "</pre>"),
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Self::Link { url, display } | Self::Prompt { url, display } => {
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writeln!(
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writer,
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"<a href=\"{url}\">{}</a>",
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match display {
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Some(d) => d,
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None => url,
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}
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)
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}
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}
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}
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}
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118
src/parser.rs
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118
src/parser.rs
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use {
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crate::Node,
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std::{
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io::{self, BufRead, Write},
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string::ToString,
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},
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};
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#[derive(Debug, Default)]
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enum Mode {
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#[default]
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Normal,
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Preformatted,
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}
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#[derive(Debug)]
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pub struct Parser<B: BufRead, W: Write> {
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reader: B,
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writer: Option<W>,
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mode: Mode,
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}
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impl<B: BufRead, W: Write> Iterator for Parser<B, W> {
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type Item = io::Result<Node>;
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fn next(&mut self) -> Option<Self::Item> {
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let mut s = String::new();
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let node = match self.reader.read_line(&mut s) {
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Ok(0) => None,
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Err(e) => Some(Err(e)),
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Ok(_) if self.is_preformatted() => Some(Ok(self.parse_preformatted(&s))),
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Ok(_) => Some(Ok(self.parse_normal(&s))),
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};
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if let Some(ref mut w) = self.writer {
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if let Some(Ok(_)) = node {
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// We throw away the possible error here if writing to our cache
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// fails. TODO: Log this somehow
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let _s = writeln!(w, "{s}");
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}
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}
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node
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}
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}
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impl<B: BufRead, W: Write> Parser<B, W> {
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pub fn new(reader: B, writer: Option<W>) -> Self {
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Self {
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reader,
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writer,
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mode: Mode::default(),
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}
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}
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fn is_preformatted(&self) -> bool {
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matches!(self.mode, Mode::Preformatted)
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}
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fn parse_normal(&mut self, s: &str) -> Node {
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if let Some(s) = s.strip_prefix("```").map(str::trim) {
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self.mode = Mode::Preformatted;
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Self::parse_pre_alt(s)
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} else if let Some(s) = s.strip_prefix("=>").map(str::trim) {
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Self::parse_link(s)
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} else if let Some(s) = s.strip_prefix("=:").map(str::trim) {
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Self::parse_prompt(s)
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} else if let Some(s) = s
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.strip_prefix("###")
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.map(str::trim)
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.map(ToString::to_string)
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{
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Node::H3(s)
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} else if let Some(s) = s.strip_prefix("##").map(str::trim).map(ToString::to_string) {
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Node::H2(s)
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} else if let Some(s) = s.strip_prefix('#').map(str::trim).map(ToString::to_string) {
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Node::H1(s)
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} else if let Some(s) = s.strip_prefix('*').map(str::trim).map(ToString::to_string) {
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Node::ListItem(s)
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} else if let Some(s) = s.strip_prefix('>').map(str::trim).map(ToString::to_string) {
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Node::Quote(s)
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} else {
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Node::Text(s.to_string())
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}
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}
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fn parse_preformatted(&mut self, s: &str) -> Node {
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if s.starts_with("```") {
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self.mode = Mode::Normal;
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Node::PreEnd
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} else {
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Node::PreBody(s.to_string())
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}
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}
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fn parse_link(s: &str) -> Node {
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let (url, display) = s
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.split_once(|x: char| x.is_ascii_whitespace())
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.map(|(u, d)| (u.trim().to_string(), Some(d.trim().to_string())))
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.unwrap_or((s.to_string(), None));
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Node::Link { url, display }
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}
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fn parse_prompt(s: &str) -> Node {
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let (url, display) = s
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.split_once(|x: char| x.is_ascii_whitespace())
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.map(|(u, d)| (u.trim().to_string(), Some(d.trim().to_string())))
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.unwrap_or((s.to_string(), None));
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Node::Prompt { url, display }
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}
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fn parse_pre_alt(s: &str) -> Node {
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let alt = if s.is_empty() {
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None
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} else {
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Some(s.to_string())
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};
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Node::PreStart { alt }
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}
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}
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