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use nom::{
branch::alt,
bytes::complete::{is_not, take_till1},
character::complete::{char, multispace0},
combinator::complete,
multi::{many0, many1},
sequence::delimited,
IResult,
};
use alloc::collections::BTreeMap;
use alloc::vec;
use alloc::vec::Vec;
use core::result::Result;
use crate::elements::*;
use crate::error::Error;
enum ParsedValue<'a> {
Subentry(&'a str),
Value(&'a str),
}
fn open_entry(input: &str) -> IResult<&str, char> {
let (input, _) = multispace0(input)?;
let (input, open) = char('(')(input)?;
Ok((input, open))
}
fn close_entry(input: &str) -> IResult<&str, char> {
let (input, _) = multispace0(input)?;
let (input, close) = char(')')(input)?;
Ok((input, close))
}
fn subentry_contents(input: &str) -> IResult<&str, &str> {
delimited(char('('), is_not(")"), char(')'))(input)
}
fn quoted_string(input: &str) -> IResult<&str, &str> {
delimited(char('"'), is_not("\""), char('"'))(input)
}
fn unquoted_string(input: &str) -> IResult<&str, &str> {
take_till1(|c| c == ' ' || c == '\n')(input)
}
fn string_key(input: &str) -> IResult<&str, &str> {
let (input, _) = multispace0(input)?;
let (input, key) = take_till1(|c| c == ' ' || c == '\n' || c == '"')(input)?;
Ok((input, key))
}
fn parse_string_value(input: &str) -> IResult<&str, (&str, ParsedValue)> {
let (input, _) = multispace0(input)?;
let (input, key) = string_key(input)?;
let (input, _) = char(' ')(input)?;
let (input, value) = alt((quoted_string, unquoted_string))(input)?;
Ok((input, (key, ParsedValue::Value(value))))
}
fn parse_sub_entry(input: &str) -> IResult<&str, (&str, ParsedValue)> {
let (input, _) = multispace0(input)?;
let (input, key) = string_key(input)?;
let (input, _) = char(' ')(input)?;
let (input, contents) = subentry_contents(input)?;
Ok((input, (key, ParsedValue::Subentry(contents))))
}
fn parse_sub_entry_data<'a>(input: &'a str) -> IResult<&'a str, SubEntry<'a>> {
let (input, _) = multispace0(input)?;
let (input, keys) = complete(many1(parse_string_value))(input)?;
let mut map = BTreeMap::new();
for (key, value) in keys {
match value {
ParsedValue::Value(value) => {
map.insert(key, value);
}
_ => unreachable!(),
}
}
Ok((input, SubEntry { keys: map }))
}
pub fn parse_document<'a>(input: &'a str) -> Result<DatDocument<'a>, Error> {
let (_, fragments) = complete(many1(parse_fragment_internal))(input)?;
let mut document: BTreeMap<&'a str, Vec<EntryFragment<'a>>> = BTreeMap::new();
for (key, entry) in fragments {
if let Some(existing) = document.get_mut(key) {
existing.push(entry);
} else {
document.insert(key, vec![entry]);
}
}
Ok(DatDocument { document })
}
pub fn parse_fragment<'a, 'b>(input: &'a str) -> Result<(&'a str, EntryFragment<'a>), Error> {
let (_, fragment) = parse_fragment_internal(input)?;
Ok(fragment)
}
fn parse_fragment_internal<'a, 'b>(
input: &'a str,
) -> IResult<&'a str, (&'a str, EntryFragment<'a>)> {
let (input, _) = multispace0(input)?;
let (input, entry_key) = string_key(input)?;
let (input, _) = open_entry(input)?;
let mut map = BTreeMap::new();
let (input, keys) = many0(alt((parse_sub_entry, parse_string_value)))(input)?;
for (key, value) in keys {
match value {
ParsedValue::Subentry(value) => {
if let Ok((_, subentry)) = parse_sub_entry_data(value) {
if let Some(node) = map.remove(key) {
match node {
EntryNode::Unique(prev) => {
map.insert(
key,
EntryNode::Many(vec![prev, EntryData::SubEntry(subentry)]),
);
}
EntryNode::Many(mut prevs) => {
prevs.push(EntryData::SubEntry(subentry));
map.insert(key, EntryNode::Many(prevs));
}
}
} else {
map.insert(key, EntryNode::Unique(EntryData::SubEntry(subentry)));
}
}
}
ParsedValue::Value(value) => {
if let Some(node) = map.remove(key) {
match node {
EntryNode::Unique(prev) => {
map.insert(key, EntryNode::Many(vec![prev, EntryData::Scalar(value)]));
}
EntryNode::Many(mut prevs) => {
prevs.push(EntryData::Scalar(value));
map.insert(key, EntryNode::Many(prevs));
}
}
} else {
map.insert(key, EntryNode::Unique(EntryData::Scalar(value)));
}
}
}
}
let (input, _) = close_entry(input)?;
Ok((input, (entry_key, EntryFragment::new(map))))
}