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function.js
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198 lines (197 loc) · 4.9 KB
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/**
* Copyright (C) 2014 Glayzzle (BSD3 License)
* @authors https://github.com/glayzzle/php-parser/graphs/contributors
* @url http://glayzzle.com
*/
module.exports = {
/**
* checks if current token is a reference keyword
*/
is_reference: function() {
if (this.token == '&') {
this.next();
return true;
}
return false;
}
/**
* checks if current token is a variadic keyword
*/
,is_variadic: function() {
if (this.token === this.tok.T_ELLIPSIS) {
this.next();
return true;
}
return false;
}
/**
* reading a function
* <ebnf>
* function ::= function_declaration code_block
* </ebnf>
*/
,read_function: function(closure, flag) {
var result = this.node(
this.read_function_declaration(closure ? 1 : flag ? 2 : 0)
);
if (flag && flag[2] == 1) {
result = result(flag);
this.expect(';').nextWithComments();
} else {
var body = this.expect('{').read_code_block(false);
if (flag) {
result = result(body, flag);
} else {
result = result(body);
}
}
return result;
}
/**
* reads a function declaration (without his body)
* <ebnf>
* function_declaration ::= T_FUNCTION '&'? T_STRING '(' parameter_list ')'
* </ebnf>
*/
,read_function_declaration: function(type) {
var nodeName = 'function';
if (type === 1) {
nodeName = 'closure';
} else if (type === 2) {
nodeName = 'method';
}
var result = this.node(nodeName);
this.expect(this.tok.T_FUNCTION);
var isRef = this.next().is_reference();
var name = false, use = [], returnType = false;
if (type !== 1) {
name = this.expect(this.tok.T_STRING).text();
this.next();
}
this.expect('(').next();
var params = this.read_parameter_list();
this.expect(')').next();
if (type === 1 && this.token === this.tok.T_USE) {
use = this.next().expect('(').next().read_list(this.read_lexical_var, ',');
this.expect(')').next();
}
if (this.token === ':') {
returnType = this.next().read_type();
}
if (type === 1) {
return result(params, isRef, use, returnType);
}
return result(name, params, isRef, returnType);
}
/**
* <ebnf>
* lexical_var ::= '&'? T_VARIABLE
* </ebnf>
*/
,read_lexical_var: function() {
var result = [false, null];
if (this.token === '&') {
result[0] = true;
this.next();
}
if (this.token === this.tok.T_VARIABLE) {
result[1] = this.text();
this.next();
} else {
this.expect(['&', this.tok.T_VARIABLE]);
}
return result;
}
/**
* reads a list of parameters
* <ebnf>
* parameter_list ::= (parameter ',')* parameter?
* </ebnf>
*/
,read_parameter_list: function() {
var result = [];
if (this.token != ')') {
while(this.token != this.EOF) {
result.push(this.read_parameter());
if (this.token == ',') {
this.next();
} else if (this.token == ')') {
break;
} else {
this.error([',', ')']);
break;
}
}
}
return result;
}
/**
* <ebnf>
* parameter ::= type? '&'? T_ELLIPSIS? T_VARIABLE ('=' expr)?
* </ebnf>
* @see https://github.com/php/php-src/blob/493524454d66adde84e00d249d607ecd540de99f/Zend/zend_language_parser.y#L640
*/
,read_parameter: function() {
var node = this.node('param');
var type = this.read_type();
var isRef = this.is_reference();
var isVariadic = this.is_variadic();
var name = this.expect(this.tok.T_VARIABLE).text();
var value = null;
if (this.next().token == '=') {
value = this.next().read_expr();
}
return node(name, type, value, isRef, isVariadic);
}
/**
* <ebnf>
* function_argument_list ::= '(' (argument_list (',' argument_list)*)? ')'
* </ebnf>
*/
,read_function_argument_list: function() {
var result = [];
this.expect('(').next();
if (this.token !== ')') {
while(this.token != this.EOF) {
result.push(this.read_argument_list());
if (this.token === ',') {
this.next();
} else break;
}
}
this.expect(')').next();
return result;
}
/**
* <ebnf>
* argument_list ::= T_ELLIPSIS? expr
* </ebnf>
*/
,read_argument_list: function() {
if (this.token === this.tok.T_ELLIPSIS ) {
return this.node('variadic')(this.next().read_expr());
}
return this.read_expr();
}
/**
* read type hinting
* <ebnf>
* type ::= T_ARRAY | T_CALLABLE | namespace_name
* </ebnf>
*/
,read_type: function() {
switch(this.token) {
case this.tok.T_ARRAY:
this.next();
return ['array'];
case this.tok.T_NS_SEPARATOR:
case this.tok.T_STRING:
return this.read_namespace_name();
case this.tok.T_CALLABLE:
this.next();
return ['callable'];
default:
return null;
}
}
};