1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148

//! Provides File record for handling files
use std::borrow::Borrow;
use std::boxed::Box;
use std::fs::{File, OpenOptions};
use std::io::{Read, Seek, SeekFrom, Write};

use crate::vmbindings::record::Record;
use crate::vmbindings::value::Value;
use crate::vmbindings::vm::Vm;
use crate::vmbindings::vmerror::VmError;

#[hana_function()]
fn constructor(path: Value::Str, mode: Value::Str) -> Value {
    // options
    let mut options = OpenOptions::new();
    for ch in mode.as_ref().chars() {
        match ch {
            'r' => options.read(true),
            'w' => options.write(true),
            'c' => options.create(true),
            'n' => options.create_new(true),
            'a' => options.append(true),
            't' => options.truncate(true),
            _ => {
                panic!("expected options");
            }
        };
    }

    // file object
    let rec = vm.malloc(Record::new());
    // store native file
    match options.open(path.as_ref().borrow() as &String) {
        Ok(file) => {
            rec.as_mut().native_field = Some(Box::new(file));
        }
        Err(err) => {
            rec.as_mut().insert(
                "prototype",
                Value::Record(vm.stdlib.as_ref().unwrap().io_error.clone()).wrap(),
            );
            rec.as_mut().insert(
                "why",
                Value::Str(vm.malloc(format!("{:?}", err).into())).wrap(),
            );
            rec.as_mut().insert("where", Value::Str(path).wrap());
            hana_raise!(vm, Value::Record(rec));
        }
    }
    rec.as_mut().insert(
        "prototype",
        Value::Record(vm.stdlib.as_ref().unwrap().file_rec.clone()).wrap(),
    );
    rec.as_mut().insert("path", Value::Str(path).wrap());
    rec.as_mut().insert("mode", Value::Str(mode).wrap());
    Value::Record(rec)
}

// reopen
#[hana_function()]
fn close(file: Value::Record) -> Value {
    file.as_mut().native_field = None;
    Value::Nil
}

// read
#[hana_function()]
fn read(file: Value::Record) -> Value {
    let field = file.as_mut().native_field.as_mut().unwrap();
    let file = field.downcast_mut::<File>().unwrap();
    let mut s = String::new();
    file.read_to_string(&mut s);
    Value::Str(vm.malloc(s.into()))
}

#[hana_function()]
fn read_up_to(file: Value::Record, n: Value::Int) -> Value {
    let field = file.as_mut().native_field.as_mut().unwrap();
    let file = field.downcast_mut::<File>().unwrap();
    let mut bytes: Vec<u8> = Vec::new();
    bytes.resize(n as usize, 0);
    file.read_exact(&mut bytes);
    Value::Str(
        vm.malloc(
            String::from_utf8(bytes)
                .unwrap_or_else(|e| panic!("error decoding file: {:?}", e))
                .into(),
        ),
    )
}

// write
#[hana_function()]
fn write(file: Value::Record, buf: Value::Str) -> Value {
    let file = file.as_mut();
    if let Some(field) = file.native_field.as_mut() {
        let file = field.downcast_mut::<File>().unwrap();
        Value::Int(file.write_all(buf.as_ref().as_bytes()).is_ok() as i64)
    } else {
        Value::Int(0)
    }
}

// positioning
#[hana_function()]
fn seek(file: Value::Record, pos: Value::Int) -> Value {
    let file = file.as_mut();
    if let Some(field) = file.native_field.as_mut() {
        let file = field.downcast_mut::<File>().unwrap();
        if let Ok(result) = file.seek(SeekFrom::Current(pos)) {
            Value::Int(result as i64)
        } else {
            Value::Int(-1)
        }
    } else {
        Value::Int(-1)
    }
}

#[hana_function()]
fn seek_from_start(file: Value::Record, pos: Value::Int) -> Value {
    let file = file.as_mut();
    if let Some(field) = file.native_field.as_mut() {
        let file = field.downcast_mut::<File>().unwrap();
        if let Ok(result) = file.seek(SeekFrom::Start(pos as u64)) {
            Value::Int(result as i64)
        } else {
            Value::Int(-1)
        }
    } else {
        Value::Int(-1)
    }
}

#[hana_function()]
fn seek_from_end(file: Value::Record, pos: Value::Int) -> Value {
    let file = file.as_mut();
    if let Some(field) = file.native_field.as_mut() {
        let file = field.downcast_mut::<File>().unwrap();
        if let Ok(result) = file.seek(SeekFrom::End(pos)) {
            Value::Int(result as i64)
        } else {
            Value::Int(-1)
        }
    } else {
        Value::Int(-1)
    }
}