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use pest::Parser;
use pest::iterators::Pair;
use pest_derive::Parser;
use crate::filter::osmfilter::logic;
const VERSION: &str = env!("CARGO_PKG_VERSION");
#[derive(Parser)]
#[grammar = "filter/osmfilter/osmfilter.pest"]
struct OSMFilterParser;
fn _interpret_statement(pair: Pair<Rule>) -> logic::Statement {
match pair.as_rule() {
Rule::commit => {
logic::Statement::CommitStatement
},
Rule::drop => {
logic::Statement::DropStatement
},
Rule::delete => {
let mut inner = pair.into_inner();
logic::Statement::DeleteStatement {
key: inner.next()
.unwrap()
.as_span()
.as_str()
.to_owned(),
}
},
Rule::set => {
let mut inner = pair.into_inner();
logic::Statement::SetStatement {
key: inner.next()
.unwrap()
.as_span()
.as_str()
.to_owned(),
value: inner.next()
.unwrap()
.as_span()
.as_str()
.to_owned(),
}
},
Rule::rename => {
let mut inner = pair.into_inner();
logic::Statement::RenameStatement {
old_key: inner.next()
.unwrap()
.as_span()
.as_str()
.to_owned(),
new_key: inner.next()
.unwrap()
.as_span()
.as_str()
.to_owned(),
}
},
Rule::selection_block => {
let mut inner = pair.into_inner();
let this_selector = inner.next()
.unwrap()
.into_inner()
.next()
.unwrap();
let mut statements = Vec::new();
for p in inner {
statements.push(_interpret_statement(p));
}
let this_selector_rule = this_selector.as_rule();
let mut this_selector_inner = this_selector.into_inner();
logic::Statement::SelectionBlock {
selector: match this_selector_rule {
Rule::has => {
logic::SelectorStatement::Has {
key: this_selector_inner.next()
.unwrap()
.as_span()
.as_str()
.to_owned()
}
},
Rule::equals => {
logic::SelectorStatement::Equals {
key: this_selector_inner.next()
.unwrap()
.as_span()
.as_str()
.to_owned(),
value: this_selector_inner.next()
.unwrap()
.as_span()
.as_str()
.to_owned(),
}
},
Rule::type_selector => {
let mut this_node = false;
let mut this_way = false;
let mut this_relation = false;
for p in this_selector_inner {
match p.as_rule() {
Rule::node => {
this_node = true;
},
Rule::way => {
this_way = true;
},
Rule::relation => {
this_relation = true;
},
_ => {
unreachable!();
},
}
}
logic::SelectorStatement::Type {
node: this_node,
way: this_way,
relation: this_relation,
}
},
_ => {
unreachable!();
},
},
statements,
}
},
_ => {
unreachable!();
},
}
}
fn _interpret_body(body: Pair<Rule>) -> logic::Filter {
match body.as_rule() {
Rule::body => {
let mut statements = Vec::new();
for pair in body.into_inner() {
statements.push(_interpret_statement(pair));
}
logic::Filter {
statements
}
},
_ => {
unreachable!();
},
}
}
pub fn parse_filter(filter_content: &str) -> logic::Filter {
let mut file = match OSMFilterParser::parse(Rule::file, filter_content) {
Ok(v) => v,
Err(e) => {
panic!("Unable to parse filter: {e:?}");
}
};
match file.next() {
Some(a) => {
let rule = a.as_rule();
match rule {
Rule::version => {
let filter_version = a.as_str();
if filter_version != VERSION {
eprintln!("WARNING: Version mismatch, the filter is version {} but you are running skyway {}. You may encounter unexpected behavior.", filter_version, VERSION);
}
},
_ => {
unreachable!();
}
}
},
_ => {
unreachable!();
}
}
match file.next() {
Some(a) => {
match a.as_rule() {
Rule::body => {
_interpret_body(a)
},
_ => {
unreachable!();
}
}
},
_ => {
unreachable!();
},
}
}