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authorBenoit Giannangeli <benoit.giannangeli@boursorama.fr>2017-03-21 15:29:53 +0100
committerBenoit Giannangeli <benoit.giannangeli@boursorama.fr>2017-03-23 08:28:07 +0100
commit9e08fa3a4b9f8848bb4eac3e745079282099a3d8 (patch)
tree64be88a45075fe93bbd8c03c3244d3a83fad7491 /src/lauxlib.js
parentc4b23126f0cb803ec944c5d7877bbf669f582374 (diff)
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loadfile
Diffstat (limited to 'src/lauxlib.js')
-rw-r--r--src/lauxlib.js129
1 files changed, 124 insertions, 5 deletions
diff --git a/src/lauxlib.js b/src/lauxlib.js
index ac7ab00..dbdb251 100644
--- a/src/lauxlib.js
+++ b/src/lauxlib.js
@@ -3,11 +3,12 @@
const assert = require('assert');
-const lstate = require('./lstate.js');
-const lapi = require('./lapi.js');
-const lua = require('./lua.js');
-const ldebug = require('./ldebug.js');
-const CT = lua.constant_types;
+const lstate = require('./lstate.js');
+const lapi = require('./lapi.js');
+const lua = require('./lua.js');
+const ldebug = require('./ldebug.js');
+const lobject = require('./lobject.js');
+const CT = lua.constant_types;
const LUA_LOADED_TABLE = "_LOADED";
@@ -399,6 +400,124 @@ const luaL_newlib = function(L, l) {
luaL_setfuncs(L, l, 0);
};
+// Only with Node
+if (typeof window === "undefined") {
+ const fs = require('fs');
+
+ class LoadF {
+ constructor() {
+ this.n = NaN; /* number of pre-read characters */
+ this.f = null; /* file being read */
+ this.buff = new Buffer(1024); /* area for reading file */
+ this.pos = 0; /* current position in file */
+ }
+ }
+
+ const getF = function(L, ud) {
+ let lf = ud;
+ let bytes = 0;
+ if (lf.n > 0) { /* are there pre-read characters to be read? */
+ lf.n = 0; /* no more pre-read characters */
+ } else { /* read a block from file */
+ lf.buff.fill(0);
+ bytes = fs.readSync(lf.f, lf.buff, 0, lf.buff.length, lf.pos); /* read block */
+ lf.pos += bytes;
+ }
+ return bytes > 0 ? new lobject.TValue(0, lf.buff).jsstring() : null; // TODO: Here reading utf8 only
+ };
+
+ const errfile = function(L, what, fnameindex, error) {
+ let serr = error.message;
+ let filename = lapi.lua_tostring(L, fnameindex).slice(1);
+ lapi.lua_pushstring(L, `cannot ${what} ${filename}: ${serr}`);
+ lapi.lua_remove(L, fnameindex);
+ return lua.thread_status.LUA_ERRFILE;
+ };
+
+ const getc = function(lf) {
+ let b = new Buffer(1);
+ let bytes = fs.readSync(lf.f, b, 0, 1, lf.pos);
+ lf.pos += bytes;
+ return bytes > 0 ? b.readUInt8() : null;
+ };
+
+ const skipBOM = function(lf) {
+ let p = "\xEF\xBB\xBF"; /* UTF-8 BOM mark */
+ lf.n = 0;
+ let c;
+ do {
+ c = getc(lf);
+ if (c === null || c !== p.charCodeAt(0)) return c;
+ p = p.slice(1);
+ lf.buff[lf.n++] = c; /* to be read by the parser */
+ } while (p.length > 0);
+ lf.n = 0; /* prefix matched; discard it */
+ return getc(lf); /* return next character */
+ };
+
+ /*
+ ** reads the first character of file 'f' and skips an optional BOM mark
+ ** in its beginning plus its first line if it starts with '#'. Returns
+ ** true if it skipped the first line. In any case, '*cp' has the
+ ** first "valid" character of the file (after the optional BOM and
+ ** a first-line comment).
+ */
+ const skipcomment = function(lf) {
+ let c = skipBOM(lf);
+ if (c === '#'.charCodeAt(0)) { /* first line is a comment (Unix exec. file)? */
+ do { /* skip first line */
+ c = getc(lf);
+ } while (c && c !== '\n'.charCodeAt(0));
+ return getc(lf); /* skip end-of-line, if present */
+ } else {
+ lf.pos--;
+ return false;
+ }
+ };
+
+ const luaL_loadfilex = function(L, filename, mode) {
+ let lf = new LoadF();
+ let fnameindex = lapi.lua_gettop(L) + 1; /* index of filename on the stack */
+ if (filename === null) {
+ lapi.lua_pushliteral(L, "=stdin");
+ lf.f = process.stdin.fd;
+ } else {
+ lapi.lua_pushstring(L, `@${filename}`);
+ try {
+ lf.f = fs.openSync(filename, "r");
+ } catch (e) {
+ return errfile(L, "open", fnameindex, e);
+ }
+ }
+
+ try {
+ let c;
+ if ((c = skipcomment(lf))) /* read initial portion */
+ lf.buff[lf.n++] = '\n'.charCodeAt(0); /* add line to correct line numbers */
+
+ if (c === lua.LUA_SIGNATURE.charCodeAt(0) && filename) { /* binary file? */
+ // ...
+ }
+
+ let status = lapi.lua_load(L, getF, lf, lapi.lua_tostring(L, -1), mode);
+ if (filename) fs.closeSync(lf.f); /* close file (even in case of errors) */
+ lapi.lua_remove(L, fnameindex);
+ return status;
+ } catch (err) {
+ lapi.lua_settop(L, fnameindex); /* ignore results from 'lua_load' */
+ return errfile(L, "read", fnameindex);
+ }
+ };
+
+ const luaL_loadfile = function(L, filename) {
+ return luaL_loadfilex(L, filename, null);
+ };
+
+ module.exports.luaL_loadfilex = luaL_loadfilex;
+ module.exports.luaL_loadfile = luaL_loadfile;
+
+}
+
module.exports.LUA_LOADED_TABLE = LUA_LOADED_TABLE;
module.exports.luaL_Buffer = luaL_Buffer;
module.exports.luaL_addchar = luaL_addchar;