Web Speech API中语法的影响

Question

在Web Speech API的示例中,始终指定语法.例如,在MDN的颜色更改示例中,语法为:

#JSGF V1.0;
grammar colors;
public <color> = aqua | azure | beige | bisque | black | blue | brown | chocolate | coral | crimson | cyan | fuchsia | ghostwhite | gold | goldenrod | gray | green | indigo | ivory | khaki | lavender | lime | linen | magenta | maroon | moccasin | navy | olive | orange | orchid | peru | pink | plum | purple | red | salmon | sienna | silver | snow | tan | teal | thistle | tomato | turquoise | violet | white | yellow ;

但是,在实际使用API​​(在Chrome 54.0.2840.71上)时,结果函数:

1. 有时会返回不符合提供的语法的字符串
2. 不提供描述语音的解析树

然后语法实际上做了什么？如何获得这些行为中的任何一种(限制语法并查看解析树)？

Answer 1

目前有一个专门与此相关的开放式 Chromium 问题：

https://bugs.chromium.org/p/chromium/issues/detail?id=799849&q=SpeechRecognition%20grammar&colspec=ID%20Pri%20M%20Stars%20ReleaseBlock%20Component%20Status%20Owner%20Summary%20OS%20Modified