Go 语言规范符号
语法符号是通过扩展 BNF （EBNF）的形式定义的：
Production = production_name "=" [ Expression ] "." .
Expression = Alternative { "|" Alternative } .
Alternative = Term { Term } .
Term = production_name | token [ "…" token ] | Group | Option | Repetition .
Group = "(" Expression ")" .
Option = "[" Expression "]" .
Repetition = "{" Expression "}" .Production 是由下面的术语和操作符构造的表达式，其优先级生序排列：
| alternation
() grouping
[] option (0 or 1 times)
{} repetition (0 to n times)小写的 Production 用于标识词汇标记。词汇标记在字面表示中用用双引号或反引号括起来。
a … b 的形式表示从 a 到 b 的可替代字符集。在规范中的其他地方也使用水平省略号 … 来非正式地表示各种枚举或未进一步指定的代码段。单个字符 … (不是三个字符 .. .)不是Go语言的标记。
The syntax is specified using Extended Backus-Naur Form (EBNF):
Production = production_name "=" [ Expression ] "." .
Expression = Alternative { "|" Alternative } .
Alternative = Term { Term } .
Term = production_name | token [ "…" token ] | Group | Option | Repetition .
Group = "(" Expression ")" .
Option = "[" Expression "]" .
Repetition = "{" Expression "}" .Productions are expressions constructed from terms and the following operators, in increasing precedence:
| alternation
() grouping
[] option (0 or 1 times)
{} repetition (0 to n times)Lower-case production names are used to identify lexical tokens. Non-terminals are in CamelCase. Lexical tokens are enclosed in double quotes "" or back quotes ``.
The form a … b represents the set of characters from a through b as alternatives. The horizontal ellipsis … is also used elsewhere in the spec to informally denote various enumerations or code snippets that are not further specified. The character … (as opposed to the three characters ...) is not a token of the Go language.
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