字符型

StringValue ::
    ""
    "StringCharacter list"
StringCharacter ::
    SourceCharacter but not " or \ or LineTerminator
    \u EscapedUnicode
    \E scapedCharacter
EscapedUnicode ::
    /[0-9A-Fa-f]{4}/
EscapedCharacter :: one of 
    " \ / b f n r t

Strings are sequences of characters wrapped in double‐quotes ("). (ex."Hello World"). White space and other otherwise‐ignored characters are significant within a string value.

Unicode characters are allowed within String value literals, however GraphQL source must not contain some ASCII control characters so escape sequences must be used to represent these characters.

语义

StringValue :: ""
    Return an empty Unicode character sequence.
StringValue :: "StringCharacter list"
    Return the Unicode character sequence of all StringCharacter Unicode character values.
StringCharacter :: SourceCharacter but not " or \ or LineTerminator
    Return the character value of SourceCharacter.
StringCharacter :: \uEscapedUnicode
    Return the character whose code unit value in the Unicode Basic Multilingual Plane is the 16‐bit hexadecimal value EscapedUnicode.
StringCharacter :: \EscapedCharacter
    Return the character value of EscapedCharacter according to the table below.