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
|
"use strict";
const assert = require('assert');
const fs = require('fs');
const lua = require('./lua.js');
const lauxlib = require('./lauxlib.js');
const IO_PREFIX = "_IO_";
const IOPREF_LEN = IO_PREFIX.length;
const IO_INPUT = lua.to_luastring(IO_PREFIX + "input");
const IO_OUTPUT = lua.to_luastring(IO_PREFIX + "output");
const tolstream = function(L) {
return lauxlib.luaL_checkudata(L, 1, lauxlib.LUA_FILEHANDLE);
};
const isclosed = function(p) {
return p.closef === null;
};
const f_tostring = function(L) {
let p = tolstream(L);
if (isclosed(p))
lua.lua_pushliteral(L, "file (closed)");
else
lua.lua_pushstring(L, lua.to_luastring(`file (${p.f.toString()})`));
return 1;
};
const tofile = function(L) {
let p = tolstream(L);
if (isclosed(p))
lauxlib.luaL_error(L, lua.to_luastring("attempt to use a closed file"));
assert(p.f);
return p.f;
};
const newprefile = function(L) {
let p = lua.lua_newuserdata(L);
p.f = null;
p.closef = null;
lauxlib.luaL_setmetatable(L, lauxlib.LUA_FILEHANDLE);
return p;
};
const aux_close = function(L) {
let p = tolstream(L);
let cf = p.closef;
p.closef = null;
return cf(L);
};
const io_close = function(L) {
if (lua.lua_isnone(L, 1)) /* no argument? */
lua.lua_getfield(L, lua.LUA_REGISTRYINDEX, IO_OUTPUT); /* use standard output */
tofile(L); /* make sure argument is an open stream */
return aux_close(L);
};
const getiofile = function(L, findex) {
lua.lua_getfield(L, lua.LUA_REGISTRYINDEX, findex);
let p = lua.lua_touserdata(L, -1);
if (isclosed(p))
lauxlib.luaL_error(L, lua.to_luastring("standard %s file is closed"), findex.slice(IOPREF_LEN));
return p.f;
};
const g_write = function(L, f, arg) {
let nargs = lua.lua_gettop(L) - arg;
let status = true;
let err;
for (; nargs--; arg++) {
let s = lauxlib.luaL_checklstring(L, arg);
try {
status = status && (fs.writeSync(f.fd, Uint8Array.from(s)) === s.length);
} catch (e) {
status = false;
err = e;
}
}
if (status) return 1; /* file handle already on stack top */
else return lauxlib.luaL_fileresult(L, status, null, err);
};
const io_write = function(L) {
return g_write(L, getiofile(L, IO_OUTPUT), 1);
};
const f_write = function(L) {
let f = tofile(L);
lua.lua_pushvalue(L, 1); /* push file at the stack top (to be returned) */
return g_write(L, f, 2);
};
const iolib = {
"close": io_close,
"write": io_write
};
const flib = {
"close": io_close,
"write": f_write,
"__tostring": f_tostring
};
const createmeta = function(L) {
lauxlib.luaL_newmetatable(L, lauxlib.LUA_FILEHANDLE); /* create metatable for file handles */
lua.lua_pushvalue(L, -1); /* push metatable */
lua.lua_setfield(L, -2, lua.to_luastring("__index", true)); /* metatable.__index = metatable */
lauxlib.luaL_setfuncs(L, flib, 0); /* add file methods to new metatable */
lua.lua_pop(L, 1); /* pop new metatable */
};
const io_noclose = function(L) {
let p = tolstream(L);
p.closef = io_noclose;
lua.lua_pushnil(L);
lua.lua_pushliteral(L, "cannot close standard file");
return 2;
};
const createstdfile = function(L, f, k, fname) {
let p = newprefile(L);
p.f = f;
p.closef = io_noclose;
if (k !== null) {
lua.lua_pushvalue(L, -1);
lua.lua_setfield(L, lua.LUA_REGISTRYINDEX, k); /* add file to registry */
}
lua.lua_setfield(L, -2, fname); /* add file to module */
};
const luaopen_io = function(L) {
lauxlib.luaL_newlib(L, iolib);
createmeta(L);
/* create (and set) default files */
createstdfile(L, process.stdin, IO_INPUT, lua.to_luastring("stdin"));
createstdfile(L, process.stdout, IO_OUTPUT, lua.to_luastring("stdout"));
createstdfile(L, process.stderr, null, lua.to_luastring("stderr"));
return 1;
};
module.exports.luaopen_io = luaopen_io;
|
