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Use parsed literal block for the grammar. Document 0 flag.

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Victor Zverovich 2012-12-12 15:41:53 -08:00
parent 363352754c
commit 4dea3200a9
1 changed files with 13 additions and 7 deletions
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README.rst
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@ -79,14 +79,20 @@ braces ``{}``. Text outside of braces is copied unchanged to the output.
If you need to include a brace character in the literal text, it can be
escaped by doubling: ``{{`` and ``}}``.
The grammar for a replacement field is as follows::
The grammar for a replacement field is as follows:
replacement_field: "{" arg_index [":" format_spec] "}"
arg_index: integer
format_spec: ["+"]["0"][width]["." precision][type]
width: integer
precision: integer
type: "c" | "d" | "e" | "E" | "f" | "F" | "g" | "G" | "o" | "p" | "s" | "x" | "X"
.. parsed-literal::
_`replacement_field`: "{" `arg_index`_ [":" `format_spec`_] "}"
_`arg_index`: integer
_`format_spec`: ["+"]["0"][`width`_]["." `precision`_][`type`_]
_`width`: integer
_`precision`: integer | "{" `arg_index`_ "}"
_`type`: "c" | "d" | "e" | "E" | "f" | "F" | "g" | "G" | "o" | "p" | "s" | "x" | "X"
Preceding the `width`_ field with ``0`` makes the padding to be placed
after the sign (if any) but before the digits. This is used for printing
fields in the form ``+000000120``. This option is only valid for numeric types.
Motivation
----------