合并语法

2025-02-25

词法语法

lexical-unit:
      lexical-elements_opt
lexical-elements:
      lexical-element lexical-elements_opt
lexical-element:
      whitespace
      token
      注释

空格

空格：
      带有 Unicode 类 Zs 的任何字符
      水平制表符字符 (U+0009)
      垂直制表符 (U+000B)
      换页符 (U+000C)
      后跟换行符 (U+000D) 的回车符 (U+000A) new-line-character
new-line-character:
      回车符 (U+000D)
      换行符 (U+000A)
      换行符 (U+0085)
      行分隔符 (U+2028)
      段落分隔符 (U+2029)

注释

comment:
      single-line-comment
      delimited-comment
single-line-comment:
       // 单行注释字符_选择
single-line-comment-characters:
      single-line-comment-character single-line-comment-characters_opt
single-line-comment-character:
      除 new-line-character 之外的任何 Unicode 字符
delimited-comment:
       /* delimited-comment-text_选择星号/
delimited-comment-text:
      delimited-comment-section delimited-comment-text_opt
delimited-comment-section:
      /
       asterisks_opt not-slash-or-asterisk
asterisks:
       * 选择星号
not-slash-or-asterisk:
      除 * 或 / 之外的任何 Unicode 字符

令牌

token:
      标识符
      关键字 (keyword)
      文本
      operator-or-punctuator

字符转义序列

character-escape-sequence:
       #( escape-sequence-list)
escape-sequence-list:
      single-escape-sequence
      escape-sequence-list,single-escape-sequence
single-escape-sequence:
      long-unicode-escape-sequence
      short-unicode-escape-sequence
      control-character-escape-sequence
      escape-escape
long-unicode-escape-sequence:
      hex-digit hex-digit hex-digit hex-digit hex-digit hex-digit hex-digit hex-digit
short-unicode-escape-sequence:
      hex-digit hex-digit hex-digit hex-digit
control-character-escape-sequence:
      control-character
control-character:
      cr
      lf
      tab
escape-escape:
      #

文本

literal:
      logical-literal
      number-literal
      text-literal
      null-literal
      verbatim-literal
logical-literal:
      true
      false
number-literal:
      decimal-number-literal
      hexadecimal-number-literal
decimal-digits:
      decimal-digit decimal-digits_opt
decimal-digit: one of
      0 1 2 3 4 5 6 7 8 9
hexadecimal-number-literal:
       0x 十六进制数字
       0X 十六进制数字
hex-digits:
      hex-digit hex-digits_opt
hex-digit: one of
      0 1 2 3 4 5 6 7 8 9 A B C D E F a b c d e f
decimal-number-literal:
      decimal-digits.decimal-digits exponent-part_opt
       . decimal-digits exponent-part_opt
      decimal-digits exponent-part_opt
exponent-part:
       e sign_opt decimal-digits
       E sign_opt decimal-digits
sign: one of
      + -
text-literal:
       " 文本文本字符_选择"
text-literal-characters:
      text-literal-character text-literal-characters_opt
text-literal-character:
      single-text-character
      character-escape-sequence
      double-quote-escape-sequence
single-text-character:
      除后跟 " (U+0022) 的 # (U+0023) 或 ( (U+0028) 外的任何字符
double-quote-escape-sequence:
       "" （U+0022、 U+0022）
null-literal:
      null
verbatim-literal:
       #!" 文本文本字符_选择"

标识符

identifier:
      regular-identifier
      quoted-identifier
regular-identifier:
      available-identifier
      available-identifier dot-character regular-identifier
available-identifier:
      不是 keyword 的 keyword-or-identifier
keyword-or-identifier:
      letter-character
      underscore-character
      identifier-start-character identifier-part-characters
identifier-start-character:
      letter-character
      underscore-character
identifier-part-characters:
      identifier-part-character identifier-part-characters_opt
identifier-part-character:
      letter-character
      decimal-digit-character
      underscore-character
      connecting-character
      combining-character
      formatting-character
generalized-identifier:
      generalized-identifier-part
      generalized-identifier separated only by blanks (U+0020) generalized-identifier-part
generalized-identifier-part:
      generalized-identifier-segment
      decimal-digit-character generalized-identifier-segment
generalized-identifier-segment:
      keyword-or-identifier
      keyword-or-identifier dot-character keyword-or-identifier
dot-character:
       . （U+002E）
underscore-character:
       _ （U+005F）
letter-character:_
      Lu、Ll、Lt、Lm、Lo 或 Nl 类的 Unicode 字符
combining-character:
      Mn 或 Mc 类的 Unicode 字符
decimal-digit-character:
      Nd 类的 Unicode 字符
connecting-character:
      Pc 类的 Unicode 字符
formatting-character:
      Cf 类的 Unicode 字符
quoted-identifier:
       #" 文本文本字符_选择"

关键字和预定义标识符

无法重新定义预定义的标识符和关键字。带引号的标识符可用于处理与预定义标识符或关键字冲突的标识符。

keyword: one of
and as each else error false if in is let meta not null or otherwise
section shared then true try type #binary #date #datetime
#datetimezone #duration #infinity #nan #sections #shared #table #time

运算符和标点符号

operator-or-punctuator: one of
, ; = < <= > >= <> + - * / & ( ) [ ] { } @ ? ?? => .. ...

语法语法

文档

document:
section-document
expression-document

节文档

section-document:
      section
section:
      literal-attributes_optsectionsection-name;section-members opt
section-name:
      标识符
section-members:
      section-member section-members_opt
section-member:
      literal-attributes_{optd shared_opt} section-member-name=表达式 ;
section-member-name:
      identifier

表达式文档

表达式

expression-document:
      表达式
expression:
      logical-or-expression
each-expression
      function-expression
      let-expression
      if-expression
      error-raising-expression
      error-handling-expression

逻辑表达式

logical-or-expression:
      logical-and-expression
      logical-and-expressionorlogical-or-expression
logical-and-expression:
      is-expression
      logical-and-expressionandis-expression

Is 表达式

is-expression:
as-expression
is-expressionisprimitive-or-nullable-primitive-type

As 表达式

as-expression:
equality-expression
作为表达式as原始类型或可空原始类型

相等表达式

equality-expression:
      relational-expression
      relational-expression=equality-expression
      relational-expression<>equality-expression

关系表达式

relational-expression:
      additive-expression
      additive-expression<relational-expression
      additive-expression>relational-expression
      additive-expression<=relational-expression
      additive-expression>=relational-expression

算术表达式

additive-expression:
      multiplicative-expression
      multiplicative-expression+additive-expression
      multiplicative-expression-additive-expression
      multiplicative-expression& _additive-expression
multiplicative-expression:
      metadata-expression
      metadata-expression*multiplicative-expression
      metadata-expression/multiplicative-expression

元数据表达式

metadata-expression:
unary-expression
unary-expressionmetaunary-expression

一元表达式

unary-expression:
      type-expression
       + unary-expression
       - unary-expression
       not unary-expression

主表达式

primary-expression:
      literal-expression
      list-expression
      record-expression
      identifier-expression
      section-access-expression
      parenthesized-expression
      field-access-expression
      item-access-expression
      invoke-expression
      not-implemented-expression

文本表达式

literal-expression:
文本

标识符表达式

identifier-expression:
      identifier-reference
identifier-reference:
      exclusive-identifier-reference
      inclusive-identifier-reference
exclusive-identifier-reference:
      标识符
inclusive-identifier-reference:
       @ 标识符

Section-access 表达式

section-access-expression:
标识符!标识符

带圆括号表达式

parenthesized-expression:
( 表达式)

Not-implemented 表达式

not-implemented-expression:
...

调用表达式

invoke-expression:
      primary-expression(参数列表_选择)
argument-list:
      表达式
      expression,argument-list

列表表达式

list-expression:
       { item-list_opt}
item-list:
      item
      item-list,
item：
      表达式
      表达式..

记录表达式

record-expression:
       [ _{field-list_opt]

field-list:

      field

      field-list,

字段中输入名称的配置设置：

      field-name=表达式

field-name:

      generalized-identifier

      quoted-identifier}

项访问表达式

item-access-expression:
      item-selection
      optional-item-selection
item-selection：
primary-expression{item-selector}
optional-item-selection:
      primary-expression{item-selector} ?
item-selector:
      expression

字段访问表达式

field-access-expression:
      field-selection
      implicit-target-field-selection
      投影 (projection)
      implicit-target-projection
field-selection:
      primary-expression field-selector
field-selector:
      required-field-selector
      optional-field-selector
required-field-selector:
       [ field-name]
optional-field-selector:
       [ field-name] ?
implicit-target-field-selection:
      field-selector
projection:
      primary-expression required-projection
      primary-expression optional-projection
必需-投影:_
       [ required-selector-list]
optional-projection:
       [ required-selector-list] ?
required-selector-list:
      required-field-selector
      required-field-selector,required-selector-list
implicit-target-projection:
      required-projection
      optional-projection

函数表达式

function-expression:
       ( parameter-listopt return-type_opt)=>function-body
function-body:
      表达式
parameter-list:
      fixed-parameter-list
      fixed-parameter-list,optional-parameter-list
      optional-parameter-list
fixed-parameter-list:
      parameter
      parameter,fixed-parameter-list
parameter：
      参数名称参数类型_选择
parameter-name:
      标识符
parameter-type:
      原始或可为空的原始类型断言
return-type:
      原始或可空原始类型断言
primitive-or-nullable-primitive-type-assertion：
       as 原始或可为空的原始类型
optional-parameter-list:
      optional-parameter
      optional-parameter optional-parameter-list,
optional-parameter:
       optional 参数

每个表达式

each-expression:
each each-expression-body
each-expression-body:
function-body

Let 表达式

let-expression:
       let variable-listin表达式
variable-list:
      variable
      variable-list,
variable：
      variable-name=表达式
variable-name:
      identifier

If 表达式

if-expression:
       if if-conditionthentrue-expressionelsefalse-expression
if-condition:
      表达式
true-expression:
      表达式
false-expression:
      expression

类型表达式

type-expression:
      primary-expression
       type primary-type
类型:
      primary-expression
      primary-type
primary-type:
      原始类型或可空原始类型
      record-type
      list-type
      function-type
      table-type
      可为空类型（nullable-type）
原始类型或可为空的原始类型：
       nullable _opt primitive-type
基元类型： 之一
      any anynonnull binary date datetime datetimezone duration function list logical
      none null number record table text time type
record-type:
       [ open-record-marker]
       [ field-specification-list_opt]
       [ field-specification-list,open-record-marker]
field-specification-list:
      field-specification
      field-specification field-specification-list,
field-specification:
       optional _opt field-name field-type-specification_opt
field-type-specification:
       = field-type
field-type:
      type
open-record-marker:
      ...
list-type:
       { item-type}
item-type:
      type
function-type:
       function ( parameter-specification-list_opt)return-type
parameter-specification-list:
      required-parameter-specification-list
      required-parameter-specification-list,optional-parameter-specification-list
      optional-parameter-specification-list
required-parameter-specification-list:
      required-parameter-specification
      required-parameter-specification,required-parameter-specification-list
required-parameter-specification:
      parameter-specification
optional-parameter-specification-list:
      optional-parameter-specification
      optional-parameter-specification,optional-parameter-specification-list
optional-parameter-specification:
       optional parameter-specification
parameter-specification:
      parameter-name parameter-type
parameter-type:
      类型断言
type-assertion：
       as 类型
table-type:
       table row-type
row-type:
       [ field-specification-list_opt]
nullable-type:
       nullable 类型

错误引发表达式

error-raising-expression:
error expression_

错误处理表达式

error-handling-expression:
       try protected-expression error-handler_选择
protected-expression:
      表达式
error-handler:
      otherwise-clause
      catch-clause
otherwise-clause:
       otherwise default-expression
default-expression:
       expression
catch-clause:
       catch catch-function
catch-function:
       ( ) => function-body

文本属性

literal-attributes:
      record-literal
record-literal:
       [ literal-field-list_opt]
literal-field-list:
      literal-field
      literal-field,literal-field-list
literal-field:
      field-name=any-literal
list-literal:
       { literal-item-list_opt}
literal-item-list:
      any-literal
      any-literal-item-list,
any-literal:
      record-literal
      list-literal
      logical-literal
      number-literal
      text-literal
      null-literal