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//! This file provides the Emacs binding for the core.
#![allow(unused_imports)]
extern crate repcore;
use repcore::{
derive::stdag::{PFRecorder, STDAGParser},
grammar::{Grammar, GrammarInfo},
semiring::{IdentityRecorder, Nat, PFS},
tokenizer::to_tokenizer,
valuation::{Count, ParseForest},
};
use repcore::parser::Parser as PParser;
use repcore::parser::ParserReportConfig as PParserConfig;
// TODO: Write Emacs binding
// Let's design the API for Emacs to use.
//
// Emacs offers the grammar file or grammar string, and then we
// generate a parser.
//
// Thereafter when we want to parse some input, Emacs gives the input
// file name or the input file string to this package, and then the
// package gives back the parse result.
//
// Besides, we need a data type to deal with errors.
//
// Handling a string is not a problem for us, but to return a parser
// to Emacs, and to return the parse result, are kind of troublesome.
//
// To achieve this, we need data types for a parser and for the parse
// result. Since a parser is just an implementation detail and should
// not be of concern to the user, we mught just represent a parser as
// just a custom user-ptr in Emacs.
//
// As to the parse result, we return a set of tuples:
//
// (label, i, k, j),
//
// where LABEL is represented as a tuple
//
// (INDEX, STRING),
//
// where index is the index of the rule and the string is the name of
// the non-terminal or the terminal that is spanned by this packed
// node.
//
// This is not intended for the user to inspect and play with. The
// package should provide another function to interpret this data, for
// example to search something or to display it. The reason we don't
// directly return something to display is that the plain forest might
// contain cyclic data, and is inconvenient to represent in Emacs. So
// we only try to display this information to the user if the need
// arises.
#[derive(Debug, Clone)]
#[repr(C)]
pub struct Parser {
g: Grammar,
gi: GrammarInfo,
stparser: STDAGParser<PFS, ParseForest, PFRecorder>,
}
impl Parser {
fn new(gs: &str) -> Result<Self, Box<dyn std::error::Error>> {
let g: Grammar = gs.parse()?;
let mut stparser = STDAGParser::new();
let mut gi = g.generate_info()?;
stparser.init(&g, &mut gi)?;
Ok(Self { g, gi, stparser })
}
}
#[no_mangle]
extern "C" fn new_parser(
gs: *mut std::os::raw::c_char,
error: *mut std::os::raw::c_int,
) -> *mut Parser {
let parsed_str;
let parser_result;
unsafe {
let cstr = std::ffi::CStr::from_ptr(gs).to_str();
if cstr.is_err() {
*error = 1;
return std::ptr::null_mut();
}
parsed_str = cstr.unwrap().to_owned();
parser_result = Parser::new(&parsed_str);
if parser_result.is_err() {
*error = 2;
eprintln!("failed: {parser_result:?}");
return std::ptr::null_mut();
}
*error = 0;
}
Box::into_raw(Box::new(parser_result.unwrap()))
}
#[no_mangle]
extern "C" fn clean_parser(parser: *const std::ffi::c_void) {
unsafe {
Box::from_raw(parser as *mut Parser);
}
}
// #[no_mangle]
// extern "C" fn reset_parser(parser: *mut Parser) {
// let mut parser_box;
// unsafe {
// parser_box = Box::from_raw(parser);
// }
// parser_box
// .stparser
// .init(&parser_box.g, &parser_box.gi)
// .unwrap();
// std::mem::forget(parser_box);
// }
// FIXME: Use a pointer to int to indicate the type of errors, and use
// a pointer to a custom error struct to convey the error messages.
#[no_mangle]
extern "C" fn parser_parse(
parser: *mut Parser,
file: *const std::os::raw::c_char,
) -> std::os::raw::c_int {
let mut parser_box;
let cstr;
unsafe {
parser_box = Box::from_raw(parser);
cstr = std::ffi::CStr::from_ptr(file).to_str();
if cstr.is_err() {
eprintln!("error reading string: {:?}", cstr);
return 0;
}
}
parser_box.stparser.reinit();
let file_string = std::fs::read_to_string(cstr.unwrap());
if file_string.is_err() {
eprintln!("error reading file: {:?}", file_string);
return 0;
}
let file_string = file_string.unwrap();
let parse_result = parser_box
.stparser
.parse(&file_string.chars().collect::<Vec<_>>());
if parse_result.is_err() {
eprintln!("failed to parse: {:?}", parse_result);
return 0;
}
let (accepting, _) = parse_result.unwrap();
std::mem::forget(parser_box);
accepting as std::os::raw::c_int
}
#[no_mangle]
extern "C" fn parser_parse_string(
parser: *mut Parser,
input: *const std::os::raw::c_char,
) -> std::os::raw::c_int {
let mut parser_box;
let cstr;
unsafe {
parser_box = Box::from_raw(parser);
cstr = std::ffi::CStr::from_ptr(input).to_str();
if cstr.is_err() {
eprintln!("error reading string: {:?}", cstr);
return 0;
}
}
parser_box.stparser.reinit();
let file_string = cstr.unwrap().to_owned();
let parse_result = parser_box
.stparser
.parse(&file_string.chars().collect::<Vec<_>>());
if parse_result.is_err() {
eprintln!("failed to parse: {:?}", parse_result);
return 0;
}
let (accepting, _) = parse_result.unwrap();
std::mem::forget(parser_box);
accepting as std::os::raw::c_int
}
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