试图了解 html5lib-test 中的 ParseError 数量

Question

我正在查看 html5lib-tests 中的以下测试用例：

{"description":"<!DOCTYPE\u0008",
"input":"<!DOCTYPE\u0008",
"output":["ParseError", "ParseError", "ParseError", 
           ["DOCTYPE",  "\u0008", null, null, false]]},

source

State                      |Input char |  Actions
--------------------------------------------------------------------------------------------
Data State                 |  "<"      | -> TagOpenState
TagOpenState               | "!"       | -> MarkupDeclarationOpenState
MarkupDeclarationOpenState | "DOCTYPE" | -> DOCTYPE state
DOCTYPE state              | "\u0008"  | Parse error; -> before DOCTYPE name state (reconsume)
before DOCTYPE name state  | "\u0008"  | DOCTYPE(name = "\u0008"); -> DOCTYPE name state
DOCTYPE name state         | EOF       | Parse error. Set force quirks on. Emit DOCTYPE -> Data state. 
Data state                 | EOF       | Emit EOF.

我想知道这三个错误是从哪里来的？我只能跟踪两个，但我假设我在某个地方犯了逻辑错误。

Answer 1

您缺少的是 "Preprocessing the input stream" 部分中的那个：

Any occurrences of any characters in the ranges U+0001 to U+0008, U+000E to U+001F, U+007F to U+009F, U+FDD0 to U+FDEF, and characters U+000B, U+FFFE, U+FFFF, U+1FFFE, U+1FFFF, U+2FFFE, U+2FFFF, U+3FFFE, U+3FFFF, U+4FFFE, U+4FFFF, U+5FFFE, U+5FFFF, U+6FFFE, U+6FFFF, U+7FFFE, U+7FFFF, U+8FFFE, U+8FFFF, U+9FFFE, U+9FFFF, U+AFFFE, U+AFFFF, U+BFFFE, U+BFFFF, U+CFFFE, U+CFFFF, U+DFFFE, U+DFFFF, U+EFFFE, U+EFFFF, U+FFFFE, U+FFFFF, U+10FFFE, and U+10FFFF are parse errors. These are all control characters or permanently undefined Unicode characters (noncharacters).

这会在 U+0008 字符到达分词器之前导致解析错误。鉴于分词器被定义为从输入流读取，分词器测试假设输入流应用了正常的预处理。

试图了解 html5lib-test 中的 ParseError 数量

Trying to understand number of ParseError in html5lib-test

html

testing

specifications