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extern crate pest;
#[macro_use]
extern crate pest_derive;
use pest::Parser;
pub mod metrics;
#[derive(Parser)]
#[grammar = "metric_grammar.pest"]
pub struct MetricParser;
pub fn parse_metrics(unparsed_metrics: String) -> metrics::Metrics {
let raw_metrics = MetricParser::parse(Rule::metrics, &unparsed_metrics)
.expect("unsuccessful parse 😥")
.next().unwrap();
let mut metrics = metrics::Metrics::new();
for raw_metric in raw_metrics.into_inner() {
let mut base_metric_name = String::new();
for line in raw_metric.into_inner() {
match line.as_rule() {
Rule::helpLine => {
let mut inner = line.into_inner();
let metric_name = inner.next().unwrap().as_str().to_string();
base_metric_name = metric_name.clone();
let help_text = match inner.next() {
Some(t) => t.as_str(),
_ => "",
};
metrics.entry(metric_name)
.and_modify(|m| m.help = help_text.to_string())
.or_insert(metrics::MetricGroup::new_with_help(help_text));
}
Rule::typeLine => {
let mut inner = line.into_inner();
let metric_name = inner.next().unwrap().as_str().to_string();
base_metric_name = metric_name.clone();
let type_text = match inner.next() {
Some(t) => t.as_str(),
_ => "",
};
metrics.entry(metric_name)
.and_modify(
|m| m.r#type = match type_text {
"counter" => metrics::MetricType::COUNTER,
"gauge" => metrics::MetricType::GAUGE,
"histogram" => metrics::MetricType::HISTOGRAM,
"summary" => metrics::MetricType::SUMMARY,
_ => metrics::MetricType::NONE,
})
.or_insert(
metrics::MetricGroup::new_with_type(type_text));
}
Rule::metricLine => {
let mut inner = line.into_inner();
let metric_name = inner.next().unwrap().as_str();
let metric_text = match inner.next() {
Some(t) => t.as_str(),
_ => "",
};
metrics.entry(base_metric_name.clone())
.and_modify(
|m| m.metric.0.push(
metrics::add(metric_name, metric_text)))
.or_insert(
metrics::MetricGroup::new_with_metric(
metric_name, metric_text));
}
_ => { () }
}
}
}
metrics
}