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* pic: support parenthesis negative notation.Kaz Kylheku2021-10-191-3/+19
| | | | | | | | | | * pic.tl (add-neg-parens): New system function. (expand-neg-parens): New macro. (expand-pic): New numeric pattern with parentheses. Also suport escaping of parentheses. (pic): Recognize parenthesized numeric pattern here also. * tests/018/format.tl: New tests.
* pic: digit separator tests.Kaz Kylheku2021-10-181-0/+24
| | | | * tests/018/format.tl: New test cases.
* pic: preserve decimal period in ### overflow fill.Kaz Kylheku2021-10-181-4/+4
| | | | | | | | | | | | | | | | | | * pic.tl (expand-pic-num): If the overflowing field specifies a decimal point other than in the rightmost position, then stick one into the fill pattern. The motivation for this is that it harmonizes with the digit separators. The new digit separator insertion logic will treat the # characters like digits, and requires the embedded decimal in order to work properly. Allowing digit separation to work in the fill pattern will make for better looking output in column displays. That's the same reason why we insert digit separators among leading zeros. * tests/018/format.tl: Overflow test cases updated in light of this requirement change. * txr.1: Documented.
* format: bug: sign not reset before each conversion.Kaz Kylheku2021-08-161-0/+4
| | | | | | | | | | | | | | | | | | For instance, this bad output is produced: (pic "+0####.## <<<<<" 123 1) -> "+00123.00 +1 " The second argument should not have any leading + sign. * stream.c (formatv): For each new conversion specifier introduced by ~, reset the sign variable to zero also. That's the semantic change here, occluded by the fact that I'm rearranging the declaration of the variables, adding comments, and condensing the assignments while also getting them into the same order as the declarations, in order that this sort of bug does not creep in in the future, should another such variable be added. * tests/018/format.tl: Adding correct version of above test case.
* format: revise numeric handling.Kaz Kylheku2021-06-141-5/+96
| | | | | | | | | | | | | | | | | | | | | | | 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.
* format: new precision - character for zero.Kaz Kylheku2021-06-141-0/+5
| | | | | | | | | | | * 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.
* pic: support quasiliteral as format string.Kaz Kylheku2021-06-111-0/+5
| | | | | | | | | | | | * 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.
* pic: allow trailing exclamation.Kaz Kylheku2021-06-111-0/+5
| | | | | | | | | | * 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.
* pic: clarification and tests.Kaz Kylheku2021-06-111-0/+6
| | | | | | | | * 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.
* pic: test cases and fixes.Kaz Kylheku2021-06-111-0/+88
| | | | | | | | | | | | | | | | | | * 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.
* format: ~x/~X specifiers support buffers.Kaz Kylheku2021-05-041-0/+29
* 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.