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Victor Zverovich 2024-05-29 18:32:33 -07:00
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doc/syntax.md
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@ -1,6 +1,6 @@
# Format String Syntax {#syntax}
[Formatting functions](api) such as `fmt::format` and `fmt::print` use the same
[Formatting functions](api.md) such as `fmt::format` and `fmt::print` use the same
format string syntax described in this section.
Format strings contain "replacement fields" surrounded by curly braces `{}`.
@ -11,15 +11,15 @@ literal text, it can be escaped by doubling: `{{` and `}}`.
The grammar for a replacement field is as follows:
<a id="replacement-field"></a>
<code class="grammar">
replacement_field ::= "{" [arg_id] [":" ([format_spec](#format-spec) | [chrono_format_spec](#chrono-format-spec))] "}"
<pre>
replacement_field ::= "{" [arg_id] [":" (<a href="#format-spec">format_spec</a> | <a href="#chrono-format-spec">chrono_format_spec</a>)] "}"
arg_id ::= integer | identifier
integer ::= digit+
digit ::= "0"..."9"
identifier ::= id_start id_continue*
id_start ::= "a"..."z" | "A"..."Z" | "_"
id_continue ::= id_start | digit
</code>
</pre>
In less formal terms, the replacement field can start with an *arg_id* that
specifies the argument whose value is to be formatted and inserted into the
@ -70,7 +70,7 @@ The general form of a *standard format specifier* is:
<a id="format-spec"></a>
<code class="grammar">
format_spec ::= [[fill]align][sign]["#"]["0"][width]["." precision]["L"][type]
format_spec ::= [[fill]align]\[sign]["#"]\["0"][width]["." precision]["L"]\[type]
fill ::= <a character other than '{' or '}'\>
align ::= "<" | ">" | "^"
sign ::= "+" | "-" | " "
@ -330,7 +330,7 @@ month) are valid only for `std::tm` and time points but not durations.
Format specifications for range types have the following syntax:
<code class="grammar">
range_format_spec ::= ["n"][range_type][range_underlying_spec]
range_format_spec ::= ["n"]\[range_type][range_underlying_spec]
</code>
The `'n'` option formats the range without the opening and closing