extern crate pest;
use pest::iterators::Pair;
use pest::iterators::Pairs;
use pest::Parser;
use jujube_lib::commit::Commit;
use jujube_lib::store::{CommitId, Signature};
use crate::styler::PlainTextStyler;
use crate::templater::{
AuthorProperty, ChangeIdProperty, CommitIdKeyword, CommitterProperty, ConditionalTemplate,
ConflictProperty, ConstantTemplateProperty, CurrentCheckoutProperty, DescriptionProperty,
DivergentProperty, DynamicLabelTemplate, LabelTemplate, ListTemplate, LiteralTemplate,
ObsoleteProperty, OpenProperty, OrphanProperty, PrunedProperty, StringPropertyTemplate,
Template, TemplateFunction, TemplateProperty,
};
use jujube_lib::repo::Repo;
#[derive(Parser)]
#[grammar = "template.pest"]
pub struct TemplateParser;
fn parse_string_literal(pair: Pair<Rule>) -> String {
assert_eq!(pair.as_rule(), Rule::literal);
let mut result = String::new();
for part in pair.into_inner() {
match part.as_rule() {
Rule::raw_literal => {
result.push_str(part.as_str());
}
Rule::escape => match part.as_str().as_bytes()[1] as char {
'"' => result.push('"'),
'\\' => result.push('\\'),
'n' => result.push('\n'),
char => panic!("invalid escape: \\{:?}", char),
},
_ => panic!("unexpected part of string: {:?}", part),
}
}
result
}
struct StringShort;
impl TemplateProperty<String, String> for StringShort {
fn extract(&self, context: &String) -> String {
context.chars().take(12).collect()
}
}
struct StringFirstLine;
impl TemplateProperty<String, String> for StringFirstLine {
fn extract(&self, context: &String) -> String {
context.lines().next().unwrap().to_string()
}
}
struct CommitIdShortest;
impl TemplateProperty<CommitId, String> for CommitIdShortest {
fn extract(&self, context: &CommitId) -> String {
CommitIdKeyword::shortest_format(context.clone())
}
}
struct SignatureName;
impl TemplateProperty<Signature, String> for SignatureName {
fn extract(&self, context: &Signature) -> String {
context.name.clone()
}
}
struct SignatureEmail;
impl TemplateProperty<Signature, String> for SignatureEmail {
fn extract(&self, context: &Signature) -> String {
context.email.clone()
}
}
fn parse_method_chain<'a, I: 'a>(
pair: Pair<Rule>,
input_property: Property<'a, I>,
) -> Property<'a, I> {
assert_eq!(pair.as_rule(), Rule::maybe_method);
if pair.as_str().is_empty() {
input_property
} else {
let method = pair.into_inner().next().unwrap();
match input_property {
Property::String(property) => {
let next_method = parse_string_method(method);
next_method.after(property)
}
Property::Boolean(property) => {
let next_method = parse_boolean_method(method);
next_method.after(property)
}
Property::CommitId(property) => {
let next_method = parse_commit_id_method(method);
next_method.after(property)
}
Property::Signature(property) => {
let next_method = parse_signature_method(method);
next_method.after(property)
}
}
}
}
fn parse_string_method<'a>(method: Pair<Rule>) -> Property<'a, String> {
assert_eq!(method.as_rule(), Rule::method);
let mut inner = method.into_inner();
let name = inner.next().unwrap();
let this_function = match name.as_str() {
"short" => Property::String(Box::new(StringShort)),
"first_line" => Property::String(Box::new(StringFirstLine)),
name => panic!("no such string method: {}", name),
};
let chain_method = inner.last().unwrap();
parse_method_chain(chain_method, this_function)
}
fn parse_boolean_method<'a>(method: Pair<Rule>) -> Property<'a, bool> {
assert_eq!(method.as_rule(), Rule::maybe_method);
let mut inner = method.into_inner();
let name = inner.next().unwrap();
panic!("no such boolean method: {}", name.as_str());
}
fn parse_commit_id_method<'a>(method: Pair<Rule>) -> Property<'a, CommitId> {
assert_eq!(method.as_rule(), Rule::method);
let mut inner = method.into_inner();
let name = inner.next().unwrap();
let this_function = match name.as_str() {
"short" => Property::String(Box::new(CommitIdShortest)),
name => panic!("no such commit id method: {}", name),
};
let chain_method = inner.last().unwrap();
parse_method_chain(chain_method, this_function)
}
fn parse_signature_method<'a>(method: Pair<Rule>) -> Property<'a, Signature> {
assert_eq!(method.as_rule(), Rule::method);
let mut inner = method.into_inner();
let name = inner.next().unwrap();
let this_function: Property<'a, Signature> = match name.as_str() {
"name" => Property::String(Box::new(SignatureName)),
"email" => Property::String(Box::new(SignatureEmail)),
name => panic!("no such commit id method: {}", name),
};
let chain_method = inner.last().unwrap();
parse_method_chain(chain_method, this_function)
}
enum Property<'a, I> {
String(Box<dyn TemplateProperty<I, String> + 'a>),
Boolean(Box<dyn TemplateProperty<I, bool> + 'a>),
CommitId(Box<dyn TemplateProperty<I, CommitId> + 'a>),
Signature(Box<dyn TemplateProperty<I, Signature> + 'a>),
}
impl<'a, I: 'a> Property<'a, I> {
fn after<C: 'a>(self, first: Box<dyn TemplateProperty<C, I> + 'a>) -> Property<'a, C> {
match self {
Property::String(property) => Property::String(Box::new(TemplateFunction::new(
first,
Box::new(move |value| property.extract(&value)),
))),
Property::Boolean(property) => Property::Boolean(Box::new(TemplateFunction::new(
first,
Box::new(move |value| property.extract(&value)),
))),
Property::CommitId(property) => Property::CommitId(Box::new(TemplateFunction::new(
first,
Box::new(move |value| property.extract(&value)),
))),
Property::Signature(property) => Property::Signature(Box::new(TemplateFunction::new(
first,
Box::new(move |value| property.extract(&value)),
))),
}
}
}
fn parse_commit_keyword<'a, 'r: 'a>(
repo: &'r dyn Repo,
pair: Pair<Rule>,
) -> (Property<'a, Commit>, String) {
assert_eq!(pair.as_rule(), Rule::identifier);
let property = match pair.as_str() {
"description" => Property::String(Box::new(DescriptionProperty)),
"change_id" => Property::String(Box::new(ChangeIdProperty)),
"commit_id" => Property::CommitId(Box::new(CommitIdKeyword)),
"author" => Property::Signature(Box::new(AuthorProperty)),
"committer" => Property::Signature(Box::new(CommitterProperty)),
"open" => Property::Boolean(Box::new(OpenProperty)),
"pruned" => Property::Boolean(Box::new(PrunedProperty)),
"current_checkout" => Property::Boolean(Box::new(CurrentCheckoutProperty { repo })),
"obsolete" => Property::Boolean(Box::new(ObsoleteProperty { repo })),
"orphan" => Property::Boolean(Box::new(OrphanProperty { repo })),
"divergent" => Property::Boolean(Box::new(DivergentProperty { repo })),
"conflict" => Property::Boolean(Box::new(ConflictProperty)),
name => panic!("unexpected identifier: {}", name),
};
(property, pair.as_str().to_string())
}
fn coerce_to_string<'a, I: 'a>(
property: Property<'a, I>,
) -> Box<dyn TemplateProperty<I, String> + 'a> {
match property {
Property::String(property) => property,
Property::Boolean(property) => Box::new(TemplateFunction::new(
property,
Box::new(|value| String::from(if value { "true" } else { "false" })),
)),
Property::CommitId(property) => Box::new(TemplateFunction::new(
property,
Box::new(CommitIdKeyword::default_format),
)),
Property::Signature(property) => Box::new(TemplateFunction::new(
property,
Box::new(|signature| signature.name),
)),
}
}
fn parse_boolean_commit_property<'a, 'r: 'a>(
repo: &'r dyn Repo,
pair: Pair<Rule>,
) -> Box<dyn TemplateProperty<Commit, bool> + 'a> {
let mut inner = pair.into_inner();
let pair = inner.next().unwrap();
let _method = inner.next().unwrap();
assert!(inner.next().is_none());
match pair.as_rule() {
Rule::identifier => match parse_commit_keyword(repo, pair.clone()).0 {
Property::Boolean(property) => property,
_ => panic!("cannot yet use this as boolean: {:?}", pair),
},
_ => panic!("cannot yet use this as boolean: {:?}", pair),
}
}
fn parse_commit_term<'a, 'r: 'a>(
repo: &'r dyn Repo,
pair: Pair<Rule>,
) -> Box<dyn Template<Commit> + 'a> {
assert_eq!(pair.as_rule(), Rule::term);
if pair.as_str().is_empty() {
Box::new(LiteralTemplate(String::new()))
} else {
let mut inner = pair.into_inner();
let expr = inner.next().unwrap();
let maybe_method = inner.next().unwrap();
assert!(inner.next().is_none());
match expr.as_rule() {
Rule::literal => {
let text = parse_string_literal(expr);
if maybe_method.as_str().is_empty() {
Box::new(LiteralTemplate(text))
} else {
let input_property =
Property::String(Box::new(ConstantTemplateProperty { output: text }));
let property = parse_method_chain(maybe_method, input_property);
let string_property = coerce_to_string(property);
Box::new(StringPropertyTemplate {
property: string_property,
})
}
}
Rule::identifier => {
let (term_property, labels) = parse_commit_keyword(repo, expr);
let property = parse_method_chain(maybe_method, term_property);
let string_property = coerce_to_string(property);
Box::new(LabelTemplate::new(
Box::new(StringPropertyTemplate {
property: string_property,
}),
labels,
))
}
Rule::function => {
let mut inner = expr.into_inner();
let name = inner.next().unwrap().as_str();
match name {
"label" => {
let label_pair = inner.next().unwrap();
let label_template = parse_commit_template_rule(
repo,
label_pair.into_inner().next().unwrap(),
);
let arg_template = match inner.next() {
None => panic!("label() requires two arguments"),
Some(pair) => pair,
};
if inner.next().is_some() {
panic!("label() accepts only two arguments")
}
let content: Box<dyn Template<Commit> + 'a> =
parse_commit_template_rule(repo, arg_template);
let get_labels = move |commit: &Commit| -> String {
let mut buf: Vec<u8> = vec![];
{
let writer = Box::new(&mut buf);
let mut styler = PlainTextStyler::new(writer);
label_template.format(commit, &mut styler);
}
String::from_utf8(buf).unwrap()
};
Box::new(DynamicLabelTemplate::new(content, Box::new(get_labels)))
}
"if" => {
let condition_pair = inner.next().unwrap();
let condition_template = condition_pair.into_inner().next().unwrap();
let condition = parse_boolean_commit_property(repo, condition_template);
let true_template = match inner.next() {
None => panic!("if() requires at least two arguments"),
Some(pair) => parse_commit_template_rule(repo, pair),
};
let false_template = match inner.next() {
None => None,
Some(pair) => Some(parse_commit_template_rule(repo, pair)),
};
if inner.next().is_some() {
panic!("if() accepts at most three arguments")
}
Box::new(ConditionalTemplate::new(
condition,
true_template,
false_template,
))
}
name => panic!("function {} not implemented", name),
}
}
other => panic!("unexpected term: {:?}", other),
}
}
}
fn parse_commit_template_rule<'a, 'r: 'a>(
repo: &'r dyn Repo,
pair: Pair<Rule>,
) -> Box<dyn Template<Commit> + 'a> {
match pair.as_rule() {
Rule::template => {
let mut inner = pair.into_inner();
let formatter = parse_commit_template_rule(repo, inner.next().unwrap());
assert!(inner.next().is_none());
formatter
}
Rule::term => parse_commit_term(repo, pair),
Rule::list => {
let mut formatters: Vec<Box<dyn Template<Commit>>> = vec![];
for inner_pair in pair.into_inner() {
formatters.push(parse_commit_template_rule(repo, inner_pair));
}
Box::new(ListTemplate(formatters))
}
_ => Box::new(LiteralTemplate(String::new())),
}
}
pub fn parse_commit_template<'a, 'r: 'a>(
repo: &'r dyn Repo,
template_text: &str,
) -> Box<dyn Template<Commit> + 'a> {
let mut pairs: Pairs<Rule> = TemplateParser::parse(Rule::template, template_text).unwrap();
let first_pair = pairs.next().unwrap();
assert!(pairs.next().is_none());
if first_pair.as_span().end() != template_text.len() {
panic!(
"failed to parse template past position {}",
first_pair.as_span().end()
);
}
parse_commit_template_rule(repo, first_pair)
}