[rkward-cvs] SF.net SVN: rkward:[2679] trunk/rkward/rkward/plugins/php2js.js

[tfry at users.sourceforge.net]

Revision: 2679
          http://rkward.svn.sourceforge.net/rkward/?rev=2679&view=rev
Author:   tfry
Date:     2009-10-03 11:39:22 +0000 (Sat, 03 Oct 2009)

Log Message:
-----------
Add initial version of a quick and dirty php->js converter

Added Paths:
-----------
    trunk/rkward/rkward/plugins/php2js.js

Added: trunk/rkward/rkward/plugins/php2js.js
===================================================================
--- trunk/rkward/rkward/plugins/php2js.js	                        (rev 0)
+++ trunk/rkward/rkward/plugins/php2js.js	2009-10-03 11:39:22 UTC (rev 2679)
@@ -0,0 +1,209 @@
+// php2js.js a small converter for PHP-code -> JS-code.
+//
+// usage: rhino php2js.js file.php > file.js
+//
+// Anybody stumbling on this, please note that this covers only a very limited range of functionality,
+// specific to the needs of the RKWard project. Give it a try if you like, but probably it does not
+// help you much.
+
+function convertTopLevel (input) {
+	var in_echo = false;
+	var first_char = true;
+	for (var i = 0; i < input.length; ++i) {
+		var c = input.charAt (i);
+		var cn = input.charAt (i+1);
+
+		// start of PHP block detection
+		if (c == "<") {
+			if (cn == "?") {
+				if (in_echo) {
+					output += "'); ";
+					in_echo = false;
+				}
+				i += 1 + convertPHPBlock (input.substr (i+2));
+				first_char = true;
+				continue;
+			}
+		}
+
+		// fallthrough: echo it
+		if (!in_echo) {
+			if ((first_char) && (c == "\n")) {
+				output += "\n";
+				first_char = false;
+				continue;
+			}
+
+			output += "echo ('";
+			in_echo = true;
+		}
+
+		if (c == "'") c = "\\'";
+//		else if (c == "\t") c = "\\t";
+		else if (c == "\n") {
+			c = "\\n');\n"
+			in_echo = false;
+		}
+
+		first_char = false;
+		output += c;
+
+		if (i >= input.length) {
+			print ("Something's wrong. Closure not found.");
+		}
+	}
+}
+
+function convertPHPBlock (input) {
+	for (var i = 0; i < input.length; ++i) {
+		var c = input.charAt (i);
+		var cn = input.charAt (i+1);
+
+		if (i == 0) {
+			if (c == " ") continue;
+			if ((c == "\n") && (output[output.length - 1] == "\n")) continue;
+		}
+
+		// end of PHP block detection
+		if (c == "?") {
+			if (cn == ">") {
+				return (i + 2);
+			}
+		}
+
+		// handle quotes
+		if (c == "\"") {
+			output += c;
+			i += convertPHPQuote (input.substr (i+1), "\"");
+			continue;
+		}
+		if (c == "\'") {
+			output += c;
+			i += convertPHPQuote (input.substr (i+1), "\'");
+			continue;
+		}
+
+		if (c == "$") {
+			var token = getToken (input.substr (i + 1));
+			output += token;
+			i += token.length;
+			continue;
+		}
+
+		// replace some functions
+		if (input.indexOf ("getRK_val", i) == i) {
+			output += "getValue";
+			i += 9;
+			continue;
+		} else if (input.indexOf ("getRK", i) == i) {
+			// replace with an echo form to allow later merging of echo statements
+			output += "echo (getValue";
+			closure = input.indexOf (")", i);
+			output += input.substring (i + 5, closure + 1) + ")";
+			i = closure;
+			continue;
+		} else if (input.indexOf ("Array", i) == i) {
+			output += "new ";
+		} else if (input.indexOf ("global ", i) == i) {
+			i += 7 + eatGlobals (input.substr (i + 7));
+			continue;
+		}
+
+		// associative array operator
+		if ((c == "=") && (cn == ">")) {
+			print ("Warning: please check correctness of conversion of arrays by hand");
+			output += ", ";
+			i++;
+			continue;
+		}
+
+		// string concatenation operator
+		if (c == ".") c = "+";
+
+		output += c;
+	}
+
+	print ("Something's wrong. Closing ?> not found.");
+	return input.length;
+}
+
+function convertPHPQuote (input, quote_char) {
+	for (var i = 0; i < input.length; ++i) {
+		var c = input.charAt (i);
+
+		// handle escapes first
+		if (c == "\\") {
+			output += c;
+			output += input.charAt (++i);
+			continue;
+		}
+
+		if ((c == "$") && (quote_char == "\"")) {
+			token = getToken (input.substr (i + 1));
+			output += quote_char + " + " + token;
+			i += token.length;
+			if (input.charAt (i + 1) != quote_char) output += " + " + quote_char;
+			continue;
+		}
+
+		// end of string
+		if (c == quote_char) {
+			output += c;
+			return (i + 1);
+		}
+
+		output += c;
+	}
+
+	print ("Something's wrong. Closing " + quote_char + " not found.");
+	return input.length;
+}
+
+function getToken (input) {
+	var i = input.search (/[^a-zA-Z0-9_]+/);
+	if ((input.charAt (i) == "[") || (input.charAt (i+1) == "[")) {	// array subscripts
+		i = input.indexOf ("]", i);
+	}
+	if (i < 1) {
+		print ("Something's wrong. Token end not found. Token start was " + input.substr (0, 10));
+		return (input);
+	}
+	return (input.substr (0, i));
+}
+
+function eatGlobals (input) {
+	var end = input.indexOf (";") + 1;
+	var text = input.substr (0, end);
+	var tokens = text.split (",");
+	for (var i = 0; i < tokens.length; ++i) {
+		globals.push (getToken (tokens[i].substr (1)));
+	}
+	return (end);
+}
+
+
+
+
+
+
+// the output buffer
+var output = "";
+// list of global vars
+globals = new Array ();
+
+file = readFile (arguments[0]);
+
+// main conversion step
+convertTopLevel (file);
+
+// add global var declarations
+globals.sort ();
+var prev_token;
+for (var i = globals.length; i >= 0; --i) {
+	if (prev_token != globals[i]) {		// print each var only once
+		prev_token = globals[i];
+		output = "var " + globals[i] + ";\n" + output;
+	}
+	if (i == 0) output = "// globals\n" + output;
+}
+print (output);


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