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use std::collections::HashMap;
use std::io::prelude::*;
use std::fs::File;
use std::fmt;
use glob::glob;
use serde::Serialize;
use serde_json::value::to_value;
use template::Template;
use filters::{FilterFn, string, array, common, number};
use context::Context;
use errors::{Result, ResultExt};
use render::Renderer;
use testers::{self, TesterFn};
pub struct Tera {
#[doc(hidden)]
pub templates: HashMap<String, Template>,
#[doc(hidden)]
pub filters: HashMap<String, FilterFn>,
#[doc(hidden)]
pub testers: HashMap<String, TesterFn>,
#[doc(hidden)]
pub autoescape_extensions: Vec<&'static str>,
}
impl Tera {
pub fn new(dir: &str) -> Result<Tera> {
if dir.find('*').is_none() {
bail!("Tera expects a glob as input, no * were found in `{}`", dir);
}
let mut templates = HashMap::new();
let mut errors = String::new();
for entry in glob(dir).unwrap().filter_map(|e| e.ok()) {
let path = entry.as_path();
if path.is_file() {
let parent_dir = dir.split_at(dir.find('*').unwrap()).0;
let filepath = path.to_string_lossy()
.replace("\\", "/")
.replace(parent_dir, "");
let mut f = File::open(path).unwrap();
let mut input = String::new();
f.read_to_string(&mut input).unwrap();
match Template::new(&filepath, &input).chain_err(|| format!("Failed to parse '{}'", filepath)) {
Ok(tpl) => { templates.insert(filepath.to_string(), tpl); },
Err(e) => {
errors += &format!("\n* {}", e);
for e in e.iter().skip(1) {
errors += &format!("\n-- {}", e);
}
}
}
}
}
if errors != "" {
bail!(errors);
}
let mut tera = Tera {
templates: templates,
filters: HashMap::new(),
testers: HashMap::new(),
autoescape_extensions: vec![".html", ".htm", ".xml"]
};
tera.build_inheritance_chains()?;
tera.register_tera_filters();
tera.register_tera_testers();
Ok(tera)
}
fn build_inheritance_chains(&mut self) -> Result<()> {
fn build_chain(tera: &Tera, start: &Template, template: &Template, mut parents: Vec<String>) -> Result<Vec<String>> {
if !parents.is_empty() && start.name == template.name {
bail!("Circular extend detected for template '{}'. Inheritance chain: `{:?}`", start.name, parents);
}
match template.parent {
Some(ref p) => {
match tera.get_template(p) {
Ok(parent) => {
parents.push(parent.name.clone());
build_chain(tera, start, parent, parents)
},
Err(_) => {
bail!(
"Template '{}' is inheriting from '{}', which doesn't exist or isn't loaded.",
template.name, p
);
}
}
},
None => Ok(parents)
}
}
let mut templates = HashMap::new();
for template in self.templates.values() {
let mut tpl = template.clone();
tpl.parents = build_chain(self, template, template, vec![])?;
for (block_name, def) in &tpl.blocks {
let mut definitions = vec![(tpl.name.clone(), def.clone())];
for parent in &tpl.parents {
let t = self.get_template(parent)
.chain_err(|| format!("Couldn't find template {} while building inheritance chains", parent))?;
if let Some(b) = t.blocks.get(block_name) {
definitions.push((t.name.clone(), b.clone()));
}
}
tpl.blocks_definitions.insert(block_name.clone(), definitions);
}
templates.insert(tpl.name.clone(), tpl);
}
self.templates = templates;
Ok(())
}
pub fn render(&self, template_name: &str, data: Context) -> Result<String> {
let template = self.get_template(template_name)?;
let mut renderer = Renderer::new(template, self, data.as_json());
renderer.render()
}
pub fn value_render<T>(&self, template_name: &str, data: &T) -> Result<String>
where T: Serialize
{
let value = to_value(data);
if !value.is_object() {
bail!("Failed to value_render '{}': context isn't an object", template_name);
}
let template = self.get_template(template_name)?;
let mut renderer = Renderer::new(template, self, value);
renderer.render()
}
#[doc(hidden)]
pub fn get_template(&self, template_name: &str) -> Result<&Template> {
match self.templates.get(template_name) {
Some(tpl) => Ok(tpl),
None => bail!("Template '{}' not found", template_name),
}
}
pub fn add_template(&mut self, name: &str, content: &str) -> Result<()> {
let tpl = Template::new(name, content)
.chain_err(|| format!("Failed to parse '{}'", name))?;
self.templates.insert(name.to_string(),tpl);
self.build_inheritance_chains()?;
Ok(())
}
pub fn add_templates(&mut self, templates: Vec<(&str, &str)>) -> Result<()> {
for (name, content) in templates {
let tpl = Template::new(name, content)
.chain_err(|| format!("Failed to parse '{}'", name))?;
self.templates.insert(name.to_string(),tpl);
}
self.build_inheritance_chains()?;
Ok(())
}
#[doc(hidden)]
pub fn get_filter(&self, filter_name: &str) -> Result<&FilterFn> {
match self.filters.get(filter_name) {
Some(fil) => Ok(fil),
None => bail!("Filter '{}' not found", filter_name),
}
}
pub fn register_filter(&mut self, name: &str, filter: FilterFn) {
self.filters.insert(name.to_string(), filter);
}
#[doc(hidden)]
pub fn get_tester(&self, tester_name: &str) -> Result<&TesterFn> {
match self.testers.get(tester_name) {
Some(t) => Ok(t),
None => bail!("Tester '{}' not found", tester_name),
}
}
pub fn register_tester(&mut self, name: &str, tester: TesterFn) {
self.testers.insert(name.to_string(), tester);
}
fn register_tera_filters(&mut self) {
self.register_filter("upper", string::upper);
self.register_filter("lower", string::lower);
self.register_filter("trim", string::trim);
self.register_filter("truncate", string::truncate);
self.register_filter("wordcount", string::wordcount);
self.register_filter("replace", string::replace);
self.register_filter("capitalize", string::capitalize);
self.register_filter("title", string::title);
self.register_filter("striptags", string::striptags);
self.register_filter("urlencode", string::urlencode);
self.register_filter("escape", string::escape_html);
self.register_filter("slugify", string::slugify);
self.register_filter("addslashes", string::addslashes);
self.register_filter("first", array::first);
self.register_filter("last", array::last);
self.register_filter("join", array::join);
self.register_filter("pluralize", number::pluralize);
self.register_filter("round", number::round);
self.register_filter("filesizeformat", number::filesizeformat);
self.register_filter("length", common::length);
self.register_filter("reverse", common::reverse);
}
fn register_tera_testers(&mut self) {
self.register_tester("defined", testers::defined);
self.register_tester("undefined", testers::undefined);
self.register_tester("odd", testers::odd);
self.register_tester("even", testers::even);
self.register_tester("string", testers::string);
self.register_tester("number", testers::number);
self.register_tester("divisibleby", testers::divisible_by);
self.register_tester("iterable", testers::iterable);
}
pub fn autoescape_on(&mut self, extensions: Vec<&'static str>) {
self.autoescape_extensions = extensions;
}
}
impl Default for Tera {
fn default() -> Tera {
let mut tera = Tera {
templates: HashMap::new(),
filters: HashMap::new(),
testers: HashMap::new(),
autoescape_extensions: vec![".html", ".htm", ".xml"]
};
tera.register_tera_filters();
tera.register_tera_testers();
tera
}
}
impl fmt::Debug for Tera {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "Tera {}", "{")?;
write!(f, "\n\ttemplates: [\n")?;
for template in self.templates.keys() {
writeln!(f, "\t\t{},", template)?;
}
write!(f, "\t]")?;
write!(f, "\n\tfilters: [\n")?;
for filter in self.filters.keys() {
writeln!(f, "\t\t{},", filter)?;
}
write!(f, "\t]")?;
write!(f, "\n\ttesters: [\n")?;
for tester in self.testers.keys() {
writeln!(f, "\t\t{},", tester)?;
}
write!(f, "\t]\n")?;
writeln!(f, "{}", "}")
}
}
#[cfg(test)]
mod tests {
use super::{Tera};
#[test]
fn test_get_inheritance_chain() {
let mut tera = Tera::default();
tera.add_templates(vec![
("a", "{% extends \"b\" %}"),
("b", "{% extends \"c\" %}"),
("c", "{% extends \"d\" %}"),
("d", ""),
]).unwrap();
assert_eq!(
tera.get_template("a").unwrap().parents,
vec!["b".to_string(), "c".to_string(), "d".to_string()]
);
assert_eq!(
tera.get_template("b").unwrap().parents,
vec!["c".to_string(), "d".to_string()]
);
assert_eq!(
tera.get_template("c").unwrap().parents,
vec!["d".to_string()]
);
assert_eq!(
tera.get_template("d").unwrap().parents.len(),
0
);
}
#[test]
fn test_missing_parent_template() {
let mut tera = Tera::default();
assert_eq!(
tera.add_template("a", "{% extends \"b\" %}").unwrap_err().description(),
"Template \'a\' is inheriting from \'b\', which doesn\'t exist or isn\'t loaded."
);
}
#[test]
fn test_circular_extends() {
let mut tera = Tera::default();
let err = tera.add_templates(vec![
("a", "{% extends \"b\" %}"),
("b", "{% extends \"a\" %}"),
]).unwrap_err();
assert!(err.description().contains("Circular extend detected for template"));
}
#[test]
fn test_get_parent_blocks_definition() {
let mut tera = Tera::default();
tera.add_templates(vec![
("grandparent", "{% block hey %}hello{% endblock hey %} {% block ending %}sincerely{% endblock ending %}"),
("parent", "{% extends \"grandparent\" %}{% block hey %}hi and grandma says {{ super() }}{% endblock hey %}"),
("child", "{% extends \"parent\" %}{% block hey %}dad says {{ super() }}{% endblock hey %}{% block ending %}{{ super() }} with love{% endblock ending %}"),
]).unwrap();
let hey_definitions = tera.get_template("child").unwrap().blocks_definitions.get("hey").unwrap();
assert_eq!(hey_definitions.len(), 3);
let ending_definitions = tera.get_template("child").unwrap().blocks_definitions.get("ending").unwrap();
assert_eq!(ending_definitions.len(), 2);
}
#[test]
fn test_get_parent_blocks_definition_nested_block() {
let mut tera = Tera::default();
tera.add_templates(vec![
("grandparent", "{% block hey %}hello{% endblock hey %}"),
("parent", "{% extends \"grandparent\" %}{% block hey %}hi and grandma says {{ super() }} {% block ending %}sincerely{% endblock ending %}{% endblock hey %}"),
("child", "{% extends \"parent\" %}{% block hey %}dad says {{ super() }}{% endblock hey %}{% block ending %}{{ super() }} with love{% endblock ending %}"),
]).unwrap();
let hey_definitions = tera.get_template("child").unwrap().blocks_definitions.get("hey").unwrap();
assert_eq!(hey_definitions.len(), 3);
let ending_definitions = tera.get_template("parent").unwrap().blocks_definitions.get("ending").unwrap();
assert_eq!(ending_definitions.len(), 1);
}
}