Parsing front matter

This commit is contained in:
Vincent Prouillet 2016-12-06 20:53:14 +09:00
parent a48a4c9bdf
commit a6e421c5e4
5 changed files with 343 additions and 14 deletions

118
Cargo.lock generated
View file

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"checksum url 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "48ccf7bd87a81b769cf84ad556e034541fb90e1cd6d4bc375c822ed9500cd9d7"
"checksum utf8-ranges 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a1ca13c08c41c9c3e04224ed9ff80461d97e121589ff27c753a16cb10830ae0f" "checksum utf8-ranges 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a1ca13c08c41c9c3e04224ed9ff80461d97e121589ff27c753a16cb10830ae0f"
"checksum vec_map 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "cac5efe5cb0fa14ec2f84f83c701c562ee63f6dcc680861b21d65c682adfb05f" "checksum vec_map 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "cac5efe5cb0fa14ec2f84f83c701c562ee63f6dcc680861b21d65c682adfb05f"
"checksum walkdir 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "dd7c16466ecc507c7cb5988db03e6eab4aaeab89a5c37a29251fcfd3ac9b7afe" "checksum walkdir 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "dd7c16466ecc507c7cb5988db03e6eab4aaeab89a5c37a29251fcfd3ac9b7afe"

View file

@ -16,6 +16,7 @@ walkdir = "1"
pulldown-cmark = "0" pulldown-cmark = "0"
regex = "0.1" regex = "0.1"
lazy_static = "0.2" lazy_static = "0.2"
tera = { git = "https://github.com/Keats/tera.git" }
clippy = {version = "~0.0.103", optional = true} clippy = {version = "~0.0.103", optional = true}
[dependencies.toml] [dependencies.toml]

View file

@ -1,6 +1,6 @@
use config:: Config; use config:: Config;
use errors::{Result, ErrorKind}; use errors::{Result};
pub fn build(config: Config) -> Result<()> { pub fn build(config: Config) -> Result<()> {

View file

@ -8,6 +8,7 @@ extern crate toml;
extern crate walkdir; extern crate walkdir;
extern crate pulldown_cmark; extern crate pulldown_cmark;
extern crate regex; extern crate regex;
extern crate tera;
mod config; mod config;
mod errors; mod errors;

View file

@ -1,17 +1,37 @@
/// A page, can be a blog post or a basic page /// A page, can be a blog post or a basic page
use std::collections::HashMap; use std::collections::{HashMap, BTreeMap};
use std::default::Default;
use pulldown_cmark as cmark; // use pulldown_cmark as cmark;
use regex::Regex; use regex::Regex;
use toml::Parser; use toml::{Parser, Value as TomlValue};
use tera::{Value, to_value};
use errors::{Result, ErrorKind}; use errors::{Result};
use errors::ErrorKind::InvalidFrontMatter;
lazy_static! { lazy_static! {
static ref DELIM_RE: Regex = Regex::new(r"\+\+\+\s*\r?\n").unwrap(); static ref DELIM_RE: Regex = Regex::new(r"\+\+\+\s*\r?\n").unwrap();
} }
// Converts from one value (Toml) to another (Tera)
// Used to fill the Page::extra map
fn toml_to_tera(val: &TomlValue) -> Value {
match *val {
TomlValue::String(ref s) | TomlValue::Datetime(ref s) => to_value(s),
TomlValue::Boolean(ref b) => to_value(b),
TomlValue::Integer(ref n) => to_value(n),
TomlValue::Float(ref n) => to_value(n),
TomlValue::Array(ref arr) => to_value(&arr.into_iter().map(toml_to_tera).collect::<Vec<_>>()),
TomlValue::Table(ref table) => {
to_value(&table.into_iter().map(|(k, v)| {
(k, toml_to_tera(v))
}).collect::<BTreeMap<_,_>>())
}
}
}
#[derive(Debug, PartialEq)] #[derive(Debug, PartialEq)]
struct Page { struct Page {
@ -23,14 +43,16 @@ struct Page {
content: String, content: String,
// tags, not to be confused with categories // tags, not to be confused with categories
tags: Vec<String>, tags: Vec<String>,
// whether this page should be public or not
is_draft: bool,
// any extra parameter present in the front matter // any extra parameter present in the front matter
// it will be passed to the template context // it will be passed to the template context
extra: HashMap<String, String>, extra: HashMap<String, Value>,
// only one category allowed // only one category allowed
category: Option<String>, category: Option<String>,
// optional date if we want to order pages (ie block) // optional date if we want to order pages (ie blog post)
date: Option<bool>, date: Option<String>,
// optional layout, if we want to specify which html to render for that page // optional layout, if we want to specify which html to render for that page
layout: Option<String>, layout: Option<String>,
// description that appears when linked, e.g. on twitter // description that appears when linked, e.g. on twitter
@ -38,42 +60,229 @@ struct Page {
} }
impl Default for Page {
fn default() -> Page {
Page {
title: "".to_string(),
url: "".to_string(),
content: "".to_string(),
tags: vec![],
is_draft: false,
extra: HashMap::new(),
category: None,
date: None,
layout: None,
description: None,
}
}
}
impl Page { impl Page {
// Parse a page given the content of the .md file // Parse a page given the content of the .md file
// Files without front matter or with invalid front matter are considered // Files without front matter or with invalid front matter are considered
// erroneous // erroneous
pub fn from_str(filename: &str, content: &str) -> Result<()> { pub fn from_str(filename: &str, content: &str) -> Result<Page> {
// 1. separate front matter from content // 1. separate front matter from content
if !DELIM_RE.is_match(content) { if !DELIM_RE.is_match(content) {
return Err(ErrorKind::InvalidFrontMatter(filename.to_string()).into()); return Err(InvalidFrontMatter(filename.to_string()).into());
} }
// 2. extract the front matter and the content // 2. extract the front matter and the content
let splits: Vec<&str> = DELIM_RE.splitn(content, 2).collect(); let splits: Vec<&str> = DELIM_RE.splitn(content, 2).collect();
let front_matter = splits[0]; let front_matter = splits[0];
if front_matter.trim() == "" {
return Err(InvalidFrontMatter(filename.to_string()).into());
}
let content = splits[1]; let content = splits[1];
// 2. parse front matter // 2. create our page, parse front matter and assign all of that
let mut page = Page::default();
page.content = content.to_string();
// Keeps track of required fields: title, url
let mut num_required_fields = 2;
let mut parser = Parser::new(&front_matter); let mut parser = Parser::new(&front_matter);
if let Some(value) = parser.parse() { if let Some(value) = parser.parse() {
for (key, value) in value.iter() {
if key == "title" {
page.title = value
.as_str()
.ok_or(InvalidFrontMatter(filename.to_string()))?
.to_string();
num_required_fields -= 1;
} else if key == "url" {
page.url = value
.as_str()
.ok_or(InvalidFrontMatter(filename.to_string()))?
.to_string();
num_required_fields -= 1;
} else if key == "draft" {
page.is_draft = value
.as_bool()
.ok_or(InvalidFrontMatter(filename.to_string()))?;
} else if key == "category" {
page.category = Some(
value
.as_str()
.ok_or(InvalidFrontMatter(filename.to_string()))?.to_string()
);
} else if key == "layout" {
page.layout = Some(
value
.as_str()
.ok_or(InvalidFrontMatter(filename.to_string()))?.to_string()
);
} else if key == "description" {
page.description = Some(
value
.as_str()
.ok_or(InvalidFrontMatter(filename.to_string()))?.to_string()
);
} else if key == "date" {
page.date = Some(
value
.as_datetime()
.ok_or(InvalidFrontMatter(filename.to_string()))?.to_string()
);
} else if key == "tags" {
let toml_tags = value
.as_slice()
.ok_or(InvalidFrontMatter(filename.to_string()))?;
for tag in toml_tags {
page.tags.push(
tag
.as_str()
.ok_or(InvalidFrontMatter(filename.to_string()))?
.to_string()
);
}
} else {
page.extra.insert(key.to_string(), toml_to_tera(value));
}
}
} else { } else {
// TODO: handle error in parsing TOML // TODO: handle error in parsing TOML
println!("parse errors: {:?}", parser.errors); println!("parse errors: {:?}", parser.errors);
} }
Ok(()) if num_required_fields > 0 {
println!("Not all required fields");
return Err(InvalidFrontMatter(filename.to_string()).into());
}
Ok(page)
} }
} }
#[cfg(test)] #[cfg(test)]
mod tests { mod tests {
use super::*; use super::{Page};
use tera::to_value;
#[test] #[test]
fn test_can_extract_front_matter() { fn test_can_parse_a_valid_page() {
let content = r#"
title = "Hello"
url = "hello-world"
+++
Hello world"#;
let res = Page::from_str("", content);
assert!(res.is_ok());
let page = res.unwrap();
assert_eq!(page.title, "Hello".to_string());
assert_eq!(page.url, "hello-world".to_string());
assert_eq!(page.content, "Hello world".to_string());
}
#[test]
fn test_can_parse_tags() {
let content = r#"
title = "Hello"
url = "hello-world"
tags = ["rust", "html"]
+++
Hello world"#;
let res = Page::from_str("", content);
assert!(res.is_ok());
let page = res.unwrap();
assert_eq!(page.title, "Hello".to_string());
assert_eq!(page.url, "hello-world".to_string());
assert_eq!(page.content, "Hello world".to_string());
assert_eq!(page.tags, ["rust".to_string(), "html".to_string()]);
}
#[test]
fn test_can_parse_extra_attributes_in_frontmatter() {
let content = r#"
title = "Hello"
url = "hello-world"
language = "en"
authors = ["Bob", "Alice"]
+++
Hello world"#;
let res = Page::from_str("", content);
assert!(res.is_ok());
let page = res.unwrap();
assert_eq!(page.title, "Hello".to_string());
assert_eq!(page.url, "hello-world".to_string());
assert_eq!(page.extra.get("language").unwrap(), &to_value("en"));
assert_eq!(
page.extra.get("authors").unwrap(),
&to_value(["Bob".to_string(), "Alice".to_string()])
);
}
#[test]
fn test_ignore_pages_with_no_front_matter() {
let content = r#"Hello world"#;
let res = Page::from_str("", content);
assert!(res.is_err());
}
#[test]
fn test_ignores_pages_with_empty_front_matter() {
let content = r#"+++\nHello world"#;
let res = Page::from_str("", content);
assert!(res.is_err());
}
#[test]
fn test_ignores_pages_with_invalid_front_matter() {
let content = r#"title = 1\n+++\nHello world"#;
let res = Page::from_str("", content);
assert!(res.is_err());
}
#[test]
fn test_ignores_pages_with_missing_required_value_front_matter() {
let content = r#"
title = ""
+++
Hello world"#;
let res = Page::from_str("", content);
assert!(res.is_err());
}
#[test]
fn test_errors_on_non_string_tag() {
let content = r#"
title = "Hello"
url = "hello-world"
tags = ["rust", 1]
+++
Hello world"#;
let res = Page::from_str("", content);
assert!(res.is_err());
} }
} }