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use crate::{lex::Stanza, Dict};
pub struct ParseState {
dict: Dict,
status: Status,
current_entry: EntryBuilder,
errors: Vec<ParseError>,
}
#[derive(Debug)]
enum ParseError {
Build(EntryBuilderError),
UndefinedState(Status, EntryBuilder, Stanza),
}
impl ParseState {
pub fn new() -> Self {
Self {
dict: Dict::new(),
status: Status::Start,
current_entry: EntryBuilder::new(),
errors: Vec::new(),
}
}
pub fn advance(mut self, stanza: Stanza) -> Self {
match (self.status, stanza) {
(Status::Start, Stanza::Entry(e)) => {
self.current_entry.set_name(e);
self.status = Status::ContainsName;
}
(Status::ContainsName, Stanza::Defn(d)) => {
self.current_entry.push_defn(d);
self.status = Status::ContainsOneDefn;
}
(Status::ContainsOneDefn | Status::ContainsMulDefn, Stanza::Defn(d)) => {
self.current_entry.push_defn(d);
self.status = Status::ContainsMulDefn;
}
(
Status::ContainsOneDefn | Status::ContainsMulDefn | Status::ContainsSynonym,
Stanza::Note(n),
) => {
self.current_entry.set_note(n);
self.status = Status::ContainsNote;
}
(
Status::ContainsOneDefn | Status::ContainsMulDefn | Status::ContainsNote,
Stanza::Synonym(s),
) => {
self.current_entry.set_synonym(s);
self.status = Status::ContainsSynonym;
}
(
Status::ContainsOneDefn
| Status::ContainsMulDefn
| Status::ContainsNote
| Status::ContainsSynonym,
Stanza::Entry(e),
) => {
// flush the current entry
match self.current_entry.build() {
Ok(entry) => self.dict.insert(entry.name, entry.into()),
Err(b) => self.register_error(ParseError::Build(b)),
};
// begin with the new one
self.current_entry.clear();
self.current_entry.set_name(e);
self.status = Status::ContainsName;
}
(Status::ContainsName, Stanza::Entry(e)) => {
// dump unfinished entry and enter new entry
self.current_entry.clear();
self.current_entry.set_name(e);
self.status = Status::ContainsName;
}
(_, new_entry) => {
// any other states means our parser is entering undefined teritorry
// register an error if we have anything in current_entry
self.register_undefined_state_error(new_entry);
// and set the status to Start and fast forward to the next entry
self.current_entry.clear();
self.status = Status::Start;
}
}
self
}
fn register_error(&mut self, error: ParseError) {
self.errors.push(error)
}
fn register_undefined_state_error(&mut self, new_entry: Stanza) {
self.register_error(ParseError::UndefinedState(
self.status,
self.current_entry.clone(),
new_entry,
));
}
pub fn finish(self) -> Dict {
self.dict
}
pub fn dump(&self) {
for err in &self.errors {
eprintln!("{err:?}");
}
}
}
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone, Copy)]
enum Status {
// ready to accept a new entry
Start,
// ready to accept a defn
ContainsName,
// can accept notes or synonyms, or flush this entry
ContainsOneDefn,
// can accept notes or synonyms, or flush this entry
ContainsMulDefn,
// can accept a synonym
ContainsNote,
// can accept a note
ContainsSynonym,
// mangled stanza, skip until the next entry occurs
}
#[derive(Debug, Clone)]
struct Entry {
name: &'static str,
defn: Vec<&'static str>,
note: Option<&'static str>,
synonym: Option<&'static str>,
}
impl From<Entry> for crate::DictValue {
fn from(entry: Entry) -> Self {
Self {
defn: entry.defn,
note: entry.note,
synonym: entry.synonym,
}
}
}
#[derive(Debug, Default, Clone)]
struct EntryBuilder {
name: Option<&'static str>,
defn: Vec<&'static str>,
note: Option<&'static str>,
synonym: Option<&'static str>,
}
#[derive(Debug)]
enum EntryBuilderError {
MissingField(&'static str),
}
impl EntryBuilder {
fn new() -> Self {
Self::default()
}
fn clear(&mut self) {
*self = Self::default();
}
fn set_name(&mut self, name: &'static str) {
self.name = Some(name);
}
fn push_defn(&mut self, defn: &'static str) {
self.defn.push(defn);
}
fn set_note(&mut self, note: &'static str) {
self.note = Some(note);
}
fn set_synonym(&mut self, synonym: &'static str) {
self.synonym = Some(synonym);
}
fn build(&self) -> Result<Entry, EntryBuilderError> {
let name = self.name.ok_or(EntryBuilderError::MissingField("name"))?;
let defn = if self.defn.is_empty() {
return Err(EntryBuilderError::MissingField("defn"));
} else {
self.defn.clone()
};
Ok(Entry {
name,
defn,
note: self.note,
synonym: self.synonym,
})
}
}
|
