语法解析BUG: yield from捕获
<?php
function from123(){}
function bug() {
yield from123();
}
bug();
/*
# 引入yield from语法之前版本 && >= 7.1.4版本无此BUG
Output for 5.6.0 - 5.6.30, hhvm-3.12.14 - 3.19.0, 7.0.18, 7.1.4
# 语法错误
Output for 7.0.0 - 7.0.17, 7.1.0 - 7.1.3
Parse error: syntax error, unexpected '(' in /in/PqKpi on line 4
Process exited with code 255.
*/
<?php
class from123 {
public static function xxx() { }
}
function g() {
yield from123::xxx();
}
Output for 7.0.0 - 7.0.17, 7.1.0 - 7.1.3
Parse error: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM) in /in/sFgBN on line 6
Process exited with code 255.
说明
yield from 匹配过早
影响
匹配该正则的生成器函数/from\d[a-zA-Z0-9_\x80-\xff]/i, 不能进行yield.
暂时规避方案
<?php
function from123(){}
function bug() {
yield (from123());
}
bug();
修复方案
官方7.1.4FIX方案, 修改词法文件
-<ST_IN_SCRIPTING>"yield"{WHITESPACE}"from" {
+<ST_IN_SCRIPTING>"yield"{WHITESPACE}"from"[^a-zA-Z0-9_\x80-\xff] {
+ yyless(--yyleng);