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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(){
if (lexical.prev)
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") pass(execute[ok]);
else cont();
}
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, altsyntax, statement, poplex);
else if (type == "keyword b") cont(pushlex("form"), altsyntax, 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") classdef();
else if (type == "foreach") cont(pushlex("form"), require("("), pushlex(")"), expression, require("as"), require("variable"), /* => $value */ expect(")"), altsyntax, poplex, statement, poplex);
else if (type == "for") cont(pushlex("form"), require("("), pushlex(")"), expression, require(";"), expression, require(";"), expression, require(")"), altsyntax, poplex, statement, poplex);
// public final function foo(), protected static $bar;
else if (type == "modifier") cont(require(["modifier", "variable", "function", "abstract"],
[null, commasep(require("variable")), funcdef, absfun]));
else if (type == "abstract") abs();
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" || type == "operator") cont(expression);
// lambda
else if (type == "function") lambdadef();
// function call or parenthesized expression: $a = ($b + 1) * 2;
else if (type == "(") cont(pushlex(")"), commasep(expression), require(")"), poplex, maybeoperator);
}
// 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);
}
// the declaration or definition of a lambda
function lambdadef() {
cont(require("("), pushlex(")"), commasep(funcarg), require(")"), maybe_lambda_use, poplex, require("{"), pushlex("}"), block, poplex);
}
// optional lambda 'use' statement
function maybe_lambda_use(token) {
if(token.type == "namespace") {
cont(require('('), commasep(funcarg), require(')'));
}
else {
pass(expression);
}
}
// the definition of a class
function classdef() {
cont(require("t_string"), expect("{"), pushlex("}"), block, poplex);
}
// either funcdef if the current token is "function", or the keyword "function" + funcdef
function absfun(token) {
if(token.type == "function") funcdef();
else cont(require(["function"], [funcdef]));
}
// the abstract class or function (with optional modifier)
function abs(token) {
cont(require(["modifier", "function", "class"], [absfun, funcdef, classdef]));
}
// 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 empty_parens_if_array(token) {
if(token.content == "array")
cont(require("("), require(")"));
}
function maybedefaultparameter(token){
if (token.content == "=") cont(require(["t_string", "string", "number", "atom"], [empty_parens_if_array, null, null]));
}
function var_or_reference(token) {
if(token.type == "variable") cont(maybedefaultparameter);
else if(token.content == "&") cont(require("variable"), maybedefaultparameter);
}
// support for default arguments: http://us.php.net/manual/en/functions.arguments.php#functions.arguments.default
function funcarg(token){
// function foo(myclass $obj) {...} or function foo(myclass &objref) {...}
if (token.type == "t_string") cont(var_or_reference);
// function foo($var) {...} or function foo(&$ref) {...}
else var_or_reference(token);
}
// 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);
}
function altsyntax(token){
if(token.content==':')
cont(altsyntaxBlock,poplex);
}
function altsyntaxBlock(token){
if (token.type == "altsyntaxend") cont(require(';'));
else pass(statement, altsyntaxBlock);
}
return parser;
}
return {make: parsePHP, electricChars: "{}:"};
})();