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+/*
+Copyright (c) 2008-2009 Yahoo! Inc. All rights reserved.
+The copyrights embodied in the content of this file are licensed by
+Yahoo! Inc. under the BSD (revised) open source license
+
+@author Dan Vlad Dascalescu <dandv@yahoo-inc.com>
+
+
+Parse function for PHP. Makes use of the tokenizer from tokenizephp.js.
+Based on parsejavascript.js by Marijn Haverbeke.
+
+
+Features:
+ + special "deprecated" style for PHP4 keywords like 'var'
+ + support for PHP 5.3 keywords: 'namespace', 'use'
+ + 911 predefined constants, 1301 predefined functions, 105 predeclared classes
+   from a typical PHP installation in a LAMP environment
+ + new feature: syntax error flagging, thus enabling strict parsing of:
+   + function definitions with explicitly or implicitly typed arguments and default values
+   + modifiers (public, static etc.) applied to method and member definitions
+   + foreach(array_expression as $key [=> $value]) loops
+ + differentiation between single-quoted strings and double-quoted interpolating strings
+
+*/
+
+
+// add the Array.indexOf method for JS engines that don't support it (e.g. IE)
+// code from https://developer.mozilla.org/En/Core_JavaScript_1.5_Reference/Global_Objects/Array/IndexOf
+if (!Array.prototype.indexOf)
+{
+  Array.prototype.indexOf = function(elt /*, from*/)
+  {
+    var len = this.length;
+
+    var from = Number(arguments[1]) || 0;
+    from = (from < 0)
+         ? Math.ceil(from)
+         : Math.floor(from);
+    if (from < 0)
+      from += len;
+
+    for (; from < len; from++)
+    {
+      if (from in this &&
+          this[from] === elt)
+        return from;
+    }
+    return -1;
+  };
+};
+
+
+var PHPParser = Editor.Parser = (function() {
+  // Token types that can be considered to be atoms, part of operator expressions
+  var atomicTypes = {
+    "atom": true, "number": true, "variable": true, "string": true
+  };
+  // Constructor for the lexical context objects.
+  function PHPLexical(indented, column, type, align, prev, info) {
+    // indentation at start of this line
+    this.indented = indented;
+    // column at which this scope was opened
+    this.column = column;
+    // type of scope ('stat' (statement), 'form' (special form), '[', '{', or '(')
+    this.type = type;
+    // '[', '{', or '(' blocks that have any text after their opening
+    // character are said to be 'aligned' -- any lines below are
+    // indented all the way to the opening character.
+    if (align != null)
+      this.align = align;
+    // Parent scope, if any.
+    this.prev = prev;
+    this.info = info;
+  };
+
+  // PHP indentation rules
+  function indentPHP(lexical) {
+    return function(firstChars) {
+      var firstChar = firstChars && firstChars.charAt(0), type = lexical.type;
+      var closing = firstChar == type;
+      if (type == "form" && firstChar == "{")
+        return lexical.indented;
+      else if (type == "stat" || type == "form")
+        return lexical.indented + indentUnit;
+      else if (lexical.info == "switch" && !closing)
+        return lexical.indented + (/^(?:case|default)\b/.test(firstChars) ? indentUnit : 2 * indentUnit);
+      else if (lexical.align)
+        return lexical.column - (closing ? 1 : 0);
+      else
+        return lexical.indented + (closing ? 0 : indentUnit);
+    };
+  };
+
+  // The parser-iterator-producing function itself.
+  function parsePHP(input, basecolumn) {
+    // Wrap the input in a token stream
+    var tokens = tokenizePHP(input);
+    // The parser state. cc is a stack of actions that have to be
+    // performed to finish the current statement. For example we might
+    // know that we still need to find a closing parenthesis and a
+    // semicolon. Actions at the end of the stack go first. It is
+    // initialized with an infinitely looping action that consumes
+    // whole statements.
+    var cc = [statements];
+    // The lexical scope, used mostly for indentation.
+    var lexical = new PHPLexical((basecolumn || 0) - indentUnit, 0, "block", false);
+    // Current column, and the indentation at the start of the current
+    // line. Used to create lexical scope objects.
+    var column = 0;
+    var indented = 0;
+    // Variables which are used by the mark, cont, and pass functions
+    // below to communicate with the driver loop in the 'next' function.
+    var consume, marked;
+
+    // The iterator object.
+    var parser = {next: next, copy: copy};
+
+    // parsing is accomplished by calling next() repeatedly
+    function next(){
+      // Start by performing any 'lexical' actions (adjusting the
+      // lexical variable), or the operations below will be working
+      // with the wrong lexical state.
+      while(cc[cc.length - 1].lex)
+        cc.pop()();
+
+      // Fetch the next token.
+      var token = tokens.next();
+
+      // Adjust column and indented.
+      if (token.type == "whitespace" && column == 0)
+        indented = token.value.length;
+      column += token.value.length;
+      if (token.content == "\n"){
+        indented = column = 0;
+        // If the lexical scope's align property is still undefined at
+        // the end of the line, it is an un-aligned scope.
+        if (!("align" in lexical))
+          lexical.align = false;
+        // Newline tokens get an indentation function associated with
+        // them.
+        token.indentation = indentPHP(lexical);
+      }
+      // No more processing for meaningless tokens.
+      if (token.type == "whitespace" || token.type == "comment"
+        || token.type == "string_not_terminated" )
+        return token;
+      // When a meaningful token is found and the lexical scope's
+      // align is undefined, it is an aligned scope.
+      if (!("align" in lexical))
+        lexical.align = true;
+
+      // Execute actions until one 'consumes' the token and we can
+      // return it. 'marked' is used to change the style of the current token.
+      while(true) {
+        consume = marked = false;
+        // Take and execute the topmost action.
+        var action = cc.pop();
+        action(token);
+
+        if (consume){
+          if (marked)
+            token.style = marked;
+          // Here we differentiate between local and global variables.
+          return token;
+        }
+      }
+      return 1; // Firebug workaround for http://code.google.com/p/fbug/issues/detail?id=1239#c1
+    }
+
+    // This makes a copy of the parser state. It stores all the
+    // stateful variables in a closure, and returns a function that
+    // will restore them when called with a new input stream. Note
+    // that the cc array has to be copied, because it is contantly
+    // being modified. Lexical objects are not mutated, so they can
+    // be shared between runs of the parser.
+    function copy(){
+      var _lexical = lexical, _cc = cc.concat([]), _tokenState = tokens.state;
+
+      return function copyParser(input){
+        lexical = _lexical;
+        cc = _cc.concat([]); // copies the array
+        column = indented = 0;
+        tokens = tokenizePHP(input, _tokenState);
+        return parser;
+      };
+    }
+
+    // Helper function for pushing a number of actions onto the cc
+    // stack in reverse order.
+    function push(fs){
+      for (var i = fs.length - 1; i >= 0; i--)
+        cc.push(fs[i]);
+    }
+    // cont and pass are used by the action functions to add other
+    // actions to the stack. cont will cause the current token to be
+    // consumed, pass will leave it for the next action.
+    function cont(){
+      push(arguments);
+      consume = true;
+    }
+    function pass(){
+      push(arguments);
+      consume = false;
+    }
+    // Used to change the style of the current token.
+    function mark(style){
+      marked = style;
+    }
+    // Add a lyer of style to the current token, for example syntax-error
+    function mark_add(style){
+      marked = marked + ' ' + style;
+    }
+
+    // Push a new lexical context of the given type.
+    function pushlex(type, info) {
+      var result = function pushlexing() {
+        lexical = new PHPLexical(indented, column, type, null, lexical, info)
+      };
+      result.lex = true;
+      return result;
+    }
+    // Pop off the current lexical context.
+    function poplex(){
+      lexical = lexical.prev;
+    }
+    poplex.lex = true;
+    // The 'lex' flag on these actions is used by the 'next' function
+    // to know they can (and have to) be ran before moving on to the
+    // next token.
+
+    // Creates an action that discards tokens until it finds one of
+    // the given type. This will ignore (and recover from) syntax errors.
+    function expect(wanted){
+      return function expecting(token){
+        if (token.type == wanted) cont();  // consume the token
+        else {
+          cont(arguments.callee);  // continue expecting() - call itself
+        }
+      };
+    }
+
+    // Require a specific token type, or one of the tokens passed in the 'wanted' array
+    // Used to detect blatant syntax errors. 'execute' is used to pass extra code
+    // to be executed if the token is matched. For example, a '(' match could
+    // 'execute' a cont( compasep(funcarg), require(")") )
+    function require(wanted, execute){
+      return function requiring(token){
+        var ok;
+        var type = token.type;
+        if (typeof(wanted) == "string")
+          ok = (type == wanted) -1;
+        else
+          ok = wanted.indexOf(type);
+        if (ok >= 0) {
+          if (execute && typeof(execute[ok]) == "function")
+            execute[ok](token);
+            cont();  // just consume the token
+        }
+        else {
+          if (!marked) mark(token.style);
+          mark_add("syntax-error");
+          cont(arguments.callee);
+        }
+      };
+    }
+
+    // Looks for a statement, and then calls itself.
+    function statements(token){
+      return pass(statement, statements);
+    }
+    // Dispatches various types of statements based on the type of the current token.
+    function statement(token){
+      var type = token.type;
+      if (type == "keyword a") cont(pushlex("form"), expression, statement, poplex);
+      else if (type == "keyword b") cont(pushlex("form"), statement, poplex);
+      else if (type == "{") cont(pushlex("}"), block, poplex);
+      else if (type == "function") funcdef();
+      // technically, "class implode {...}" is correct, but we'll flag that as an error because it overrides a predefined function
+      else if (type == "class") cont(require("t_string"), expect("{"), pushlex("}"), block, poplex);
+      else if (type == "foreach") cont(pushlex("form"), require("("), pushlex(")"), expression, require("as"), require("variable"), /* => $value */ expect(")"), poplex, statement, poplex);
+      else if (type == "for") cont(pushlex("form"), require("("), pushlex(")"), expression, require(";"), expression, require(";"), expression, require(")"), poplex, statement, poplex);
+      // public final function foo(), protected static $bar;
+      else if (type == "modifier") cont(require(["modifier", "variable", "function"], [null, null, funcdef]));
+      else if (type == "switch") cont(pushlex("form"), require("("), expression, require(")"), pushlex("}", "switch"), require([":", "{"]), block, poplex, poplex);
+      else if (type == "case") cont(expression, require(":"));
+      else if (type == "default") cont(require(":"));
+      else if (type == "catch") cont(pushlex("form"), require("("), require("t_string"), require("variable"), require(")"), statement, poplex);
+      else if (type == "const") cont(require("t_string"));  // 'const static x=5' is a syntax error
+      // technically, "namespace implode {...}" is correct, but we'll flag that as an error because it overrides a predefined function
+      else if (type == "namespace") cont(namespacedef, require(";"));
+      // $variables may be followed by operators, () for variable function calls, or [] subscripts
+      else pass(pushlex("stat"), expression, require(";"), poplex);
+    }
+    // Dispatch expression types.
+    function expression(token){
+      var type = token.type;
+      if (atomicTypes.hasOwnProperty(type)) cont(maybeoperator);
+      else if (type == "<<<") cont(require("string"), maybeoperator);  // heredoc/nowdoc
+      else if (type == "t_string") cont(maybe_double_colon, maybeoperator);
+      else if (type == "keyword c") cont(expression);
+      // function call or parenthesized expression: $a = ($b + 1) * 2;
+      else if (type == "(") cont(pushlex(")"), commasep(expression), require(")"), poplex, maybeoperator);
+      else if (type == "operator") cont(expression);
+    }
+    // Called for places where operators, function calls, or subscripts are
+    // valid. Will skip on to the next action if none is found.
+    function maybeoperator(token){
+      var type = token.type;
+      if (type == "operator") {
+        if (token.content == "?") cont(expression, require(":"), expression);  // ternary operator
+        else cont(expression);
+      }
+      else if (type == "(") cont(pushlex(")"), expression, commasep(expression), require(")"), poplex, maybeoperator /* $varfunc() + 3 */);
+      else if (type == "[") cont(pushlex("]"), expression, require("]"), maybeoperator /* for multidimensional arrays, or $func[$i]() */, poplex);
+    }
+    // A regular use of the double colon to specify a class, as in self::func() or myclass::$var;
+    // Differs from `namespace` or `use` in that only one class can be the parent; chains (A::B::$var) are a syntax error.
+    function maybe_double_colon(token) {
+      if (token.type == "t_double_colon")
+        // A::$var, A::func(), A::const
+        cont(require(["t_string", "variable"]), maybeoperator);
+      else {
+        // a t_string wasn't followed by ::, such as in a function call: foo()
+        pass(expression)
+      }
+    }
+    // the declaration or definition of a function
+    function funcdef() {
+      cont(require("t_string"), require("("), pushlex(")"), commasep(funcarg), require(")"), poplex, block);
+    }
+    // Parses a comma-separated list of the things that are recognized
+    // by the 'what' argument.
+    function commasep(what){
+      function proceed(token) {
+        if (token.type == ",") cont(what, proceed);
+      };
+      return function commaSeparated() {
+        pass(what, proceed);
+      };
+    }
+    // Look for statements until a closing brace is found.
+    function block(token) {
+      if (token.type == "}") cont();
+      else pass(statement, block);
+    }
+    function maybedefaultparameter(token){
+      if (token.content == "=") cont(expression);
+    }
+    // support for default arguments: http://us.php.net/manual/en/functions.arguments.php#functions.arguments.default
+    function funcarg(token){
+      // function foo(myclass $obj) {...}
+      if (token.type == "t_string") cont(require("variable"), maybedefaultparameter);
+      // function foo($string) {...}
+      else if (token.type == "variable") cont(maybedefaultparameter);
+    }
+
+    // A namespace definition or use
+    function maybe_double_colon_def(token) {
+      if (token.type == "t_double_colon")
+        cont(namespacedef);
+    }
+    function namespacedef(token) {
+      pass(require("t_string"), maybe_double_colon_def);
+    }
+
+    return parser;
+  }
+
+  return {make: parsePHP, electricChars: "{}:"};
+
+})();