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There are a number of issues, such as left adjustment not
working and such. This needs a better treatment from the
requirements level, through to a set of test cases.
* stream.c (max, min): Macros macros added, in their usual
form.
(vformat_num): Implement new rules which suppress the zero and
space characters used in place of a sign if they overflow the
field width.
(formatv): Clamp integer precision field to width - 1 for
integers, for consistency with floating-point handling.
For floating-point values under ~a and ~s, do not force
the second stage precision to width - 1; only clamp it
if it is greater.
* format.tl: Numerous new tests.
* txr.1: Significant redocumenting of this area. The handling
of numbers is described as a two stage process, clarifying the
changing role of "precision" in the two stages.
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* stream.c (formatv): The - precision option character
produces a "sign" that is a zero. If this is used with leading
zeros, it will avoid generating a space. The requirements can
use improvement here, but one step at a time.
* tests/018/format.tl: Some tests.
* txr.1: Documented.
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* share/txr/stdlib/pic.tl (pic): Refactor string compilation
code into local function which has access to the overall
argument list. Recognize the quasiliteral case and translate
by compiling all the string parts, then forming a recombined
quasiliteral where the compiled parts are substituted.
* tests/018/format.tl: test case for this.
* txr.1: Documented.
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* share/txr/stdlib/pic.tl (expand-pic-num, expand-pic, pic):
Allow ### to be followed by a single !. This is not counted
toward the field width.
* tests/018/format.tl: Cover with some tests.
* txr.1: Doc updated.
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* tests/018/format.tl: Add tests which combine overflow
flagging with +/-. The space generated by - contributes to
overflow.
* txr.1: Clarify overflow issue in documentation.
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* share/txr/stdlib/pic.tl (expand-pic-num): Bug: when a field
overflows, the (rest ...) call truncates the leftmost digit.
A failing test case is (pic "#.#" 12) which produces "2.0"
instead of "12.0". Firstly, we only need that logic at all in
the zero padding case. When the number is positive, we stick
in the + request, so we are sure to get a + character. The
rest call then predictably chops off the + rather than a
digit.
(pic-join-opt): Fix two bugs here in the string-string combine
case: using s2 instead of s1, and not splicing in rest.
(expand-pic, pic): Implement tightening for escape sequences.
If ~ is not followed by anything, or not followed by the
documented characters for escaping, it is erroneous.
* format.tl: Battery of new tests.
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* buf.c (buf_hex): New function.
* buf.h (buf_hex): Declared.
* stream.c (formatv): Support printing of buffers in hex
via temporary buffer containing hex characters, similarly
to how bignums are handled.
* tests/018/format.tl: New file, providing some coverage over
new and affected code.
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