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| /*!
* Copyright (C) 2017 Glayzzle (BSD3 License)
* @authors https://github.com/glayzzle/php-parser/graphs/contributors
* @url http://glayzzle.com
*/
"use strict";
module.exports = {
/**
* Reads a variable
*
* ```ebnf
* variable ::= &? ...complex @todo
* ```
*
* Some samples of parsed code :
* ```php
* &$var // simple var
* $var // simple var
* classname::CONST_NAME // dynamic class name with const retrieval
* foo() // function call
* $var->func()->property // chained calls
* ```
*/
read_variable: function(read_only, encapsed, byref) {
var result;
// check the byref flag
if (!byref && this.token === '&') {
byref = true;
this.next();
}
// reads the entry point
if (this.is([this.tok.T_VARIABLE, '$'])) {
result = this.read_reference_variable(encapsed, byref);
} else if (this.is([this.tok.T_NS_SEPARATOR, this.tok.T_STRING, this.tok.T_NAMESPACE])) {
result = this.node();
var name = this.read_namespace_name();
if (
this.token != this.tok.T_DOUBLE_COLON
&& this.token != '('
) {
// @see parser.js line 130 : resolves a conflict with scalar
var literal = name.name.toLowerCase();
if (literal === 'true') {
result = result('boolean', true);
} else if (literal === 'false') {
result = result('boolean', false);
} else {
// @todo null keyword ?
result = result('constref', name);
}
} else {
result = name;
}
} else Eif (this.token === this.tok.T_STATIC) {
result = this.node('constref');
this.next();
result = result('static');
} else {
this.expect('VARIABLE');
}
// static mode
if (this.token === this.tok.T_DOUBLE_COLON) {
result = this.read_static_getter(result, encapsed);
}
return this.recursive_variable_chain_scan(result, read_only, encapsed);
}
// resolves a static call
,read_static_getter: function(what, encapsed) {
var result = this.node('staticlookup');
var offset = null;
if (this.next().is([this.tok.T_VARIABLE, '$'])) {
offset = this.read_reference_variable(encapsed, false);
} else Eif (
this.token === this.tok.T_STRING
|| this.token === this.tok.T_CLASS
) {
offset = this.node('constref');
var name = this.text();
this.next();
offset = offset(name);
} else {
this.error([this.tok.T_VARIABLE, this.tok.T_STRING]);
// graceful mode : set getter as error node and continue
offset = this.node('constref');
var name = this.text();
this.next();
offset = offset(name);
}
return result(what, offset);
}
,recursive_variable_chain_scan: function(result, read_only, encapsed) {
recursive_scan_loop:
while(this.token != this.EOF) {
switch(this.token) {
case '(':
if (read_only) {
// @fixme : add more informations & test
return result;
} else {
result = this.node('call')(
result, this.read_function_argument_list()
);
}
break;
case '[':
var node = this.node('offsetlookup');
this.next();
var offset = false;
Iif (encapsed) {
offset = this.read_encaps_var_offset();
this.expect(']') && this.next();
} else {
// callable_variable : https://github.com/php/php-src/blob/493524454d66adde84e00d249d607ecd540de99f/Zend/zend_language_parser.y#L1122
Eif (this.token !== ']') {
offset = this.read_expr();
this.expect(']') && this.next();
} else {
this.next();
}
}
result = node(result, offset);
break;
case this.tok.T_OBJECT_OPERATOR:
var node = this.node('propertylookup');
var what = null;
switch(this.next().token) {
case this.tok.T_STRING:
what = this.node('constref');
var name = this.text();
this.next();
what = what(name);
Iif (this.token === this.tok.T_VARIABLE) {
var inner = this.node('variable');
name = this.text().substring(1);
this.next();
what = this.node('encapsed')(
[what, inner(name, false)],
'offset'
);
if (what.loc && what.value[0].loc) {
what.loc.start = what.value[0].loc.start;
}
} else Iif (this.token === '{') {
var expr = this.next().read_expr();
this.expect('}') && this.next();
what = this.node('encapsed')(
[what, expr],
'offset'
);
if (what.loc && what.value[0].loc) {
what.loc.start = what.value[0].loc.start;
}
}
break;
case this.tok.T_VARIABLE:
what = this.node('variable');
var name = this.text().substring(1);
this.next();
what = what(name, false);
break;
case '$':
this.next().expect(['{', this.tok.T_VARIABLE]);
if (this.token === '{') {
// $obj->${$varname}
what = this.next().read_expr();
this.expect('}') && this.next();
} else {
// $obj->$$varname
what = this.read_expr();
}
break;
case '{':
what = this.next().read_expr();
this.expect('}') && this.next();
break;
default:
this.error([this.tok.T_STRING, this.tok.T_VARIABLE]);
// graceful mode : set what as error mode & continue
what = this.node('constref');
var name = this.text();
this.next();
what = what(name);
break;
}
result = node(result, what);
break;
default:
break recursive_scan_loop;
}
}
return result;
}
/**
* https://github.com/php/php-src/blob/493524454d66adde84e00d249d607ecd540de99f/Zend/zend_language_parser.y#L1231
*/
,read_encaps_var_offset: function() {
var offset = this.node();
Iif (this.token === this.tok.T_STRING) {
var text = this.text();
var isDblQuote = text[0] === '"';
text = text.substring(1, text.length - 1);
this.next();
offset = offset(
'string', isDblQuote, this.resolve_special_chars(text)
);
} else Eif (this.token === this.tok.T_NUM_STRING) {
var num = this.text();
this.next();
offset = offset('number', num);
} else if (this.token === this.tok.T_VARIABLE) {
var name = this.text().substring(1);
this.next();
offset = offset('variable', name, false);
} else {
this.expect([
this.tok.T_STRING,
this.tok.T_NUM_STRING,
this.tok.T_VARIABLE
]);
// fallback : consider as text
var text = this.text();
this.next();
offset = offset('string', false, text);
}
return offset;
}
/**
* ```ebnf
* reference_variable ::= simple_variable ('[' OFFSET ']')* | '{' EXPR '}'
* ```
* <code>
* $foo[123]; // foo is an array ==> gets its entry
* $foo{1}; // foo is a string ==> get the 2nd char offset
* ${'foo'}[123]; // get the dynamic var $foo
* $foo[123]{1}; // gets the 2nd char from the 123 array entry
* </code>
*/
,read_reference_variable: function(encapsed, byref) {
var result = this.read_simple_variable(byref);
while(this.token != this.EOF) {
var node = this.node();
if (this.token == '[') {
var offset = null;
Iif (encapsed) {
offset = this.next().read_encaps_var_offset();
} else {
offset = this.next().token === ']' ? null : this.read_dim_offset();
}
this.expect(']') && this.next();
result = node('offsetlookup', result, offset);
} else if (this.token == '{' && !encapsed) {
var offset = this.next().read_expr();
this.expect('}') && this.next();
result = node('offsetlookup', result, offset);
} else break;
}
return result;
}
/**
* ```ebnf
* simple_variable ::= T_VARIABLE | '$' '{' expr '}' | '$' simple_variable
* ```
*/
,read_simple_variable: function(byref) {
var result = this.node('variable');
if (this.expect([this.tok.T_VARIABLE, '$']) && this.token === this.tok.T_VARIABLE) {
// plain variable name
var name = this.text().substring(1);
this.next();
result = result(name, byref);
} else {
Eif (this.token === '$') this.next();
// dynamic variable name
switch(this.token) {
case '{':
var expr = this.next().read_expr();
this.expect('}') && this.next();
result = result(expr, byref);
break;
case '$': // $$$var
result = result(this.read_simple_variable(false), byref);
break;
case this.tok.T_VARIABLE: // $$var
var name = this.text().substring(1);
var node = this.node('variable');
this.next();
result = result(node(name, false), byref);
break;
default:
this.error(['{', '$', this.tok.T_VARIABLE]);
// graceful mode
var name = this.text();
this.next();
result = result(name, byref);
}
}
return result;
}
};
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