debug.debug

Use readline-sync to read from stdin interactively

1 files changed, 55 insertions, 0 deletions

diff --git a/src/ldblib.js b/src/ldblib.js
new file mode 100644
index 0000000..39b9574
--- /dev/null
+++ b/src/ldblib.js
@@ -0,0 +1,55 @@
+"use strict";
+
+const assert  = require('assert');
+
+const lua     = require('./lua.js');
+const lapi    = require('./lapi.js');
+const lauxlib = require('./lauxlib.js');
+
+
+const dblib = {
+};
+
+// Only with Node
+if (typeof require === "function") {
+    let fs = false;
+    try {
+        fs = require('fs');
+    } catch (e) {}
+
+    if (fs) {
+        const readlineSync = require('readline-sync');
+        readlineSync.setDefaultOptions({
+            prompt: 'lua_debug> '
+        });
+
+        // TODO: if in browser, use a designated input in the DOM ?  
+        const db_debug = function(L) {
+            for (;;) {
+                let input = readlineSync.prompt();
+
+                if (input === "cont")
+                    return 0;
+
+                if (input.length === 0)
+                    continue;
+
+                let buffer = lua.to_luastring(input);
+                if (lauxlib.luaL_loadbuffer(L, buffer, buffer.length, lua.to_luastring("=(debug command)"))
+                    || lapi.lua_pcall(L, 0, 0, 0)) {
+                    lauxlib.lua_writestringerror(`${lapi.lua_tojsstring(L, -1)}\n`);
+                }
+                lapi.lua_settop(L, 0);  /* remove eventual returns */
+            }
+        };
+
+        dblib.debug = db_debug;
+    }
+}
+
+const luaopen_debug = function(L) {
+    lauxlib.luaL_newlib(L, dblib);
+    return 1;
+};
+
+module.exports.luaopen_debug = luaopen_debug;