From 5d66234c47be4b7708f159aef7055613408a3725 Mon Sep 17 00:00:00 2001
From: minjaesong <alswo9628@gmail.com>
Date: Sun, 1 Nov 2020 17:48:23 +0900
Subject: [PATCH] empty commit message

---
 assets/tvdos/TVDOS.SYS  |  6 ++++
 assets/tvdos/command.js | 67 ++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 72 insertions(+), 1 deletion(-)

diff --git a/assets/tvdos/TVDOS.SYS b/assets/tvdos/TVDOS.SYS
index 25b0cad..cafaca3 100644
--- a/assets/tvdos/TVDOS.SYS
+++ b/assets/tvdos/TVDOS.SYS
@@ -71,6 +71,12 @@ var execApp = function(cmdsrc, args) {
 ///////////////////////////////////////////////////////////////////////////////
 
 // Boot script
+_TVDOS.defaults = {
+    path: [
+        ""
+    ]
+};
+
 filesystem.open("A", "tvdos/command.js", "R");
 let cmdsrc = filesystem.readAll("A");
 
diff --git a/assets/tvdos/command.js b/assets/tvdos/command.js
index fd6301a..ee29a4e 100644
--- a/assets/tvdos/command.js
+++ b/assets/tvdos/command.js
@@ -16,7 +16,72 @@ function greet() {
 
 
 let shell = {};
-shell.test = "command.js test string";
+// example input: echo "the string" > subdir\test.txt
+shell.parse = function(input) {
+    let tokens = [];
+    let stringBuffer = "";
+    let mode = "LITERAL"; // LITERAL, QUOTE, ESCAPE, LIMBO
+    let i = 0
+    while (i < input.length) {
+        const c = input[i];
+/*digraph g {
+	LITERAL -> QUOTE [label="\""]
+	LITERAL -> LIMBO [label="space"]
+	LITERAL -> LITERAL [label=else]
+
+	QUOTE -> LIMBO [label="\""]
+	QUOTE -> ESCAPE [label="\\"]
+	QUOTE -> QUOTE [label=else]
+
+	ESCAPE -> QUOTE
+
+	LIMBO -> LITERAL [label="not space"]
+	LIMBO -> LIMBO [label="space"]
+}*/
+        if (mode == "LITERAL") {
+            if (c == ' ') {
+                tokens.push(stringBuffer); stringBuffer = "";
+                mode = "LIMBO";
+            }
+            else if (c == '"') {
+                tokens.push(stringBuffer); stringBuffer = "";
+                mode = "QUOTE";
+            }
+            else {
+                stringBuffer += c;
+            }
+        }
+        else if (mode == "LIMBO") {
+            if (c != ' ') {
+                mode = "LITERAL";
+                stringBuffer += c;
+            }
+        }
+        else if (mode == "QUOTE") {
+            if (c == '"') {
+                tokens.push(stringBuffer); stringBuffer = "";
+            }
+            else if (c == '\\') {
+                mode = "ESCAPE";
+            }
+            else {
+                stringBuffer += c;
+            }
+        }
+        else if (mode == "ESCAPE") {
+
+        }
+
+        // end of the input string
+        if (i == input.length - 1) {
+            stringBuffer += c;
+            tokens.push(stringBuffer);
+        }
+
+        i += 1;
+    }
+    return tokens;
+}
 if (exec_args !== undefined) return shell;