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Fix markdown
This commit is contained in:
Victor Zverovich
parent
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commit
191b0cb486
225
doc/syntax.md
225
doc/syntax.md
@ -12,7 +12,8 @@ The grammar for a replacement field is as follows:
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<a id="replacement-field"></a>
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<pre>
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replacement_field ::= "{" [arg_id] [":" (<a href="#format-spec">format_spec</a> | <a href="#chrono-format-spec">chrono_format_spec</a>)] "}"
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replacement_field ::= "{" [arg_id] [":" (<a href="#format-spec">format_spec</a
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> | <a href="#chrono-format-spec">chrono_format_spec</a>)] "}"
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arg_id ::= integer | identifier
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integer ::= digit+
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digit ::= "0"..."9"
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@ -77,8 +78,10 @@ format_spec ::= [[fill]align][sign]["#"]["0"][width]["." precision]["L"][type]
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fill ::= <a character other than '{' or '}'>
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align ::= "<" | ">" | "^"
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sign ::= "+" | "-" | " "
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width ::= <a href="#replacement-field">integer</a> | "{" [<a href="#replacement-field">arg_id</a>] "}"
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precision ::= <a href="#replacement-field">integer</a> | "{" [<a href="#replacement-field">arg_id</a>] "}"
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width ::= <a href="#replacement-field">integer</a> | "{" [<a
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href="#replacement-field">arg_id</a>] "}"
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precision ::= <a href="#replacement-field">integer</a> | "{" [<a
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href="#replacement-field">arg_id</a>] "}"
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type ::= "a" | "A" | "b" | "B" | "c" | "d" | "e" | "E" | "f" | "F" |
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"g" | "G" | "o" | "p" | "s" | "x" | "X" | "?"
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</pre>
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@ -92,13 +95,10 @@ the fill character and the alignment option are absent.
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The meaning of the various alignment options is as follows:
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<table>
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<thead>
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<tr>
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<th>Option</th>
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<th>Meaning</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>'<'</code></td>
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<td>
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@ -117,7 +117,6 @@ The meaning of the various alignment options is as follows:
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<td><code>'^'</code></td>
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<td>Forces the field to be centered within the available space.</td>
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</tr>
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</tbody>
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</table>
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Note that unless a minimum field width is defined, the field width will
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@ -127,11 +126,29 @@ option has no meaning in this case.
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The *sign* option is only valid for floating point and signed integer
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types, and can be one of the following:
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| Option | Meaning |
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|--------|-------------------------------------------------------------------------------------------------------------|
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| `'+'` | indicates that a sign should be used for both nonnegative as well as negative numbers. |
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| `'-'` | indicates that a sign should be used only for negative numbers (this is the default behavior). |
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| space | indicates that a leading space should be used on nonnegative numbers, and a minus sign on negative numbers. |
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<table>
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<tr>
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<th>Option</th>
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<th>Meaning</th>
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</tr>
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<tr>
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<td><code>'+'</code></td>
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<td>
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Indicates that a sign should be used for both nonnegative as well as
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negative numbers.
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</td>
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<td><code>'-'</code></td>
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<td>
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Indicates that a sign should be used only for negative numbers (this is the
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default behavior).
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</td>
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<td>space</td>
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<td>
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Indicates that a leading space should be used on nonnegative numbers, and a
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minus sign on negative numbers.
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</td>
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</tr>
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</table>
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The `'#'` option causes the "alternate form" to be used for the
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conversion. The alternate form is defined differently for different
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@ -191,16 +208,58 @@ The available character presentation types are:
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The available integer presentation types are:
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| Type | Meaning |
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|-------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| `'b'` | Binary format. Outputs the number in base 2. Using the `'#'` option with this type adds the prefix `"0b"` to the output value. |
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| `'B'` | Binary format. Outputs the number in base 2. Using the `'#'` option with this type adds the prefix `"0B"` to the output value. |
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| `'c'` | Character format. Outputs the number as a character. |
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| `'d'` | Decimal integer. Outputs the number in base 10. |
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| `'o'` | Octal format. Outputs the number in base 8. |
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| `'x'` | Hex format. Outputs the number in base 16, using lower-case letters for the digits above 9. Using the `'#'` option with this type adds the prefix `"0x"` to the output value. |
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| `'X'` | Hex format. Outputs the number in base 16, using upper-case letters for the digits above 9. Using the `'#'` option with this type adds the prefix `"0X"` to the output value. |
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| none | The same as `'d'`. |
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<table>
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<tr>
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<th>Type</th>
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<th>Meaning</th>
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</tr>
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<tr>
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<td><code>'b'</code></td>
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<td>
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Binary format. Outputs the number in base 2. Using the <code>'#'</code>
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option with this type adds the prefix <code>"0b"</code> to the output value.
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</td>
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</tr>
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<tr>
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<td><code>'B'</code></td>
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<td>
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Binary format. Outputs the number in base 2. Using the <code>'#'</code>
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option with this type adds the prefix <code>"0B"</code> to the output value.
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</td>
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</tr>
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<tr>
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<td><code>'c'</code></td>
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<td>Character format. Outputs the number as a character.</td>
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</tr>
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<tr>
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<td><code>'d'</code></td>
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<td>Decimal integer. Outputs the number in base 10.</td>
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</tr>
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<tr>
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<td><code>'o'</code></td>
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<td>Octal format. Outputs the number in base 8.</td>
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</tr>
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<tr>
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<td><code>'x'</code></td>
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<td>
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Hex format. Outputs the number in base 16, using lower-case letters for the
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digits above 9. Using the <code>'#'</code> option with this type adds the
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prefix <code>"0x"</code> to the output value.
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</td>
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</tr>
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<tr>
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<td><code>'X'</code></td>
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<td>
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Hex format. Outputs the number in base 16, using upper-case letters for the
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digits above 9. Using the <code>'#'</code> option with this type adds the
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prefix <code>"0X"</code> to the output value.
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</td>
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</tr>
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<tr>
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<td>none</td>
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<td>The same as <code>'d'</code>.</td>
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</tr>
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</table>
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Integer presentation types can also be used with character and Boolean values
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with the only exception that `'c'` cannot be used with `bool`. Boolean values
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@ -209,69 +268,77 @@ presentation type is not specified.
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The available presentation types for floating-point values are:
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<table style="width:96%;">
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<colgroup>
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<col style="width: 13%" />
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<col style="width: 81%" />
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</colgroup>
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<thead>
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<tr class="header">
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<th>Type</th>
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<th>Meaning</th>
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<table>
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<tr>
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<th>Type</th>
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<th>Meaning</th>
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</tr>
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</thead>
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<tbody>
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<tr class="odd">
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<td><code>'a'</code></td>
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<td>Hexadecimal floating point format. Prints the number in base 16 with
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prefix <code>"0x"</code> and lower-case letters for digits above 9. Uses
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<code>'p'</code> to indicate the exponent.</td>
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<tr>
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<td><code>'a'</code></td>
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<td>
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Hexadecimal floating point format. Prints the number in base 16 with
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prefix <code>"0x"</code> and lower-case letters for digits above 9.
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Uses <code>'p'</code> to indicate the exponent.
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</td>
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</tr>
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<tr class="even">
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<td><code>'A'</code></td>
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<td>Same as <code>'a'</code> except it uses upper-case letters for the
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prefix, digits above 9 and to indicate the exponent.</td>
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<tr>
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<td><code>'A'</code></td>
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<td>
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Same as <code>'a'</code> except it uses upper-case letters for the
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prefix, digits above 9 and to indicate the exponent.
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</td>
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</tr>
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<tr class="odd">
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<td><code>'e'</code></td>
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<td>Exponent notation. Prints the number in scientific notation using
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the letter 'e' to indicate the exponent.</td>
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<tr>
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<td><code>'e'</code></td>
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<td>
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Exponent notation. Prints the number in scientific notation using
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the letter 'e' to indicate the exponent.
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</td>
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</tr>
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<tr class="even">
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<td><code>'E'</code></td>
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<td>Exponent notation. Same as <code>'e'</code> except it uses an
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upper-case <code>'E'</code> as the separator character.</td>
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<tr>
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<td><code>'E'</code></td>
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<td>
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Exponent notation. Same as <code>'e'</code> except it uses an
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upper-case <code>'E'</code> as the separator character.
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</td>
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</tr>
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<tr class="odd">
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<td><code>'f'</code></td>
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<td>Fixed point. Displays the number as a fixed-point number.</td>
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<tr>
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<td><code>'f'</code></td>
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<td>Fixed point. Displays the number as a fixed-point number.</td>
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</tr>
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<tr class="even">
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<td><code>'F'</code></td>
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<td>Fixed point. Same as <code>'f'</code>, but converts <code>nan</code>
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to <code>NAN</code> and <code>inf</code> to <code>INF</code>.</td>
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<tr>
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<td><code>'F'</code></td>
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<td>
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Fixed point. Same as <code>'f'</code>, but converts <code>nan</code>
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to <code>NAN</code> and <code>inf</code> to <code>INF</code>.
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</td>
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</tr>
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<tr class="odd">
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<td><code>'g'</code></td>
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<td><p>General format. For a given precision <code>p >= 1</code>,
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this rounds the number to <code>p</code> significant digits and then
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formats the result in either fixed-point format or in scientific
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notation, depending on its magnitude.</p>
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<p>A precision of <code>0</code> is treated as equivalent to a precision
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of <code>1</code>.</p></td>
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<tr>
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<td><code>'g'</code></td>
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<td>
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<p>General format. For a given precision <code>p >= 1</code>,
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this rounds the number to <code>p</code> significant digits and then
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formats the result in either fixed-point format or in scientific
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notation, depending on its magnitude.</p>
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<p>A precision of <code>0</code> is treated as equivalent to a precision
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of <code>1</code>.</p>
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</td>
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</tr>
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<tr class="even">
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<td><code>'G'</code></td>
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<td>General format. Same as <code>'g'</code> except switches to
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<code>'E'</code> if the number gets too large. The representations of
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infinity and NaN are uppercased, too.</td>
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<tr>
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<td><code>'G'</code></td>
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<td>
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General format. Same as <code>'g'</code> except switches to
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<code>'E'</code> if the number gets too large. The representations of
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infinity and NaN are uppercased, too.
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</td>
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</tr>
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<tr class="odd">
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<td>none</td>
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<td>Similar to <code>'g'</code>, except that the default precision is as
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high as needed to represent the particular value.</td>
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<tr>
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<td>none</td>
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<td>
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Similar to <code>'g'</code>, except that the default precision is as
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high as needed to represent the particular value.
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</td>
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</tr>
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</tbody>
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</table>
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The available presentation types for pointers are:
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@ -288,7 +355,9 @@ as `std::tm` have the following syntax:
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<a id="chrono-format-spec"></a>
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<pre>
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chrono_format_spec ::= [[<a href="#format-spec">fill</a>]<a href="#format-spec">align</a>][<a href="#format-spec">width</a>]["." <a href="#format-spec">precision</a>][chrono_specs]
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chrono_format_spec ::= [[<a href="#format-spec">fill</a>]<a href="#format-spec"
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>align</a>][<a href="#format-spec">width</a>]["." <a href="#format-spec"
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>precision</a>][chrono_specs]
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chrono_specs ::= [chrono_specs] conversion_spec | chrono_specs literal_char
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conversion_spec ::= "%" [padding_modifier] [locale_modifier] chrono_type
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literal_char ::= <a character other than '{', '}' or '%'>
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@ -359,8 +428,8 @@ The available padding modifiers (*padding_modifier*) are:
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| `'_'` | Do not pad a numeric result string. |
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| `'0'` | Pad a numeric result string with zeros. |
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Currently, these modifiers are only supported for the ``'H', 'I', 'M', 'S', 'U', 'V'``
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and ``'W'`` presentation types.
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Currently, these modifiers are only supported for the `'H'`, `'I'`, `'M'`,
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`'S'`, `'U'`, `'V'` and `'W'` presentation types.
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## Range Format Specifications
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