Changeset 37635 in project


Ignore:
Timestamp:
06/01/19 09:06:48 (7 weeks ago)
Author:
wasamasa
Message:

Fix markup

File:
1 edited

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  • wiki/eggref/5/format

    r36277 r37635  
    3737A list of all supported, non-supported and extended directives follows:
    3838
    39 Format Specification (Format version 3.1)
    40 -----------------------------------------
    41 
    42 Please consult a Common LISP format reference manual for a detailed
    43 description of the format string syntax.
    44 
    45 This implementation supports directive parameters and modifiers (`:' and `@'
    46 characters). Multiple parameters must be separated by a comma (`,').
    47 Parameters can be numerical parameters (positive or negative), character
    48 parameters (prefixed by a quote character (`''), variable parameters (`v'),
    49 number of rest arguments parameter (`#'), empty and default parameters.
    50 Directive characters are case independent.
    51 
    52 The general form of a directive is:
    53 
    54 DIRECTIVE ::= ~{DIRECTIVE-PARAMETER,}[:][@]DIRECTIVE-CHARACTER
    55 
    56 DIRECTIVE-PARAMETER ::= [ [-|+]{0-9}+ | 'CHARACTER | v | # ]
    57 
    58 Implemented CL Format Control Directives
    59 ........................................
    60 
    61 Documentation syntax: Uppercase characters represent the corresponding control
    62 directive characters. Lowercase characters represent control directive
    63 parameter descriptions.
    64 
    65 `~A'
    66 
    67     Any (print as `display' does).
    68 
    69    `~@A'
    70 
    71          left pad.
    72 
    73    `~MINCOL,COLINC,MINPAD,PADCHARA'
    74 
    75          full padding.
    76 
    77 `~S'
    78 
    79     S-expression (print as `write' does).
    80 
    81    `~@S'
    82 
    83          left pad.
    84 
    85    `~MINCOL,COLINC,MINPAD,PADCHARS'
    86 
    87          full padding.
    88 
    89 `~D'
    90 
    91     Decimal.
    92 
    93    `~@D'
    94 
    95          print number sign always.
    96 
    97    `~:D'
    98 
    99          print comma separated.
    100 
    101    `~MINCOL,PADCHAR,COMMACHARD'
    102 
    103          padding.
    104 
    105 `~X'
    106 
    107     Hexadecimal.
    108 
    109    `~@X'
    110 
    111          print number sign always.
    112 
    113    `~:X'
    114 
    115          print comma separated.
    116 
    117    `~MINCOL,PADCHAR,COMMACHARX'
    118 
    119          padding.
    120 
    121 `~O'
    122 
    123     Octal.
    124 
    125    `~@O'
    126 
    127          print number sign always.
    128 
    129    `~:O'
    130 
    131          print comma separated.
    132 
    133    `~MINCOL,PADCHAR,COMMACHARO'
    134 
    135          padding.
    136 
    137 `~B'
    138 
    139     Binary.
    140 
    141    `~@B'
    142 
    143          print number sign always.
    144 
    145    `~:B'
    146 
    147          print comma separated.
    148 
    149    `~MINCOL,PADCHAR,COMMACHARB'
    150 
    151          padding.
    152 
    153 `~NR'
    154 
    155     Radix N.
    156 
    157    `~N,MINCOL,PADCHAR,COMMACHARR'
    158 
    159          padding.
    160 
    161 `~@R'
    162 
    163     print a number as a Roman numeral.
    164 
    165 `~:@R'
    166 
    167     print a number as an "old fashioned" Roman numeral.
    168 
    169 `~:R'
    170 
    171     print a number as an ordinal English number.
    172 
    173 `~R'
    174 
    175     print a number as a cardinal English number.
    176 
    177 `~P'
    178 
    179     Plural.
    180 
    181    `~@P'
    182 
    183          prints `y' and `ies'.
    184 
    185    `~:P'
    186 
    187          as `~P but jumps 1 argument backward.'
    188 
    189    `~:@P'
    190 
    191          as `~@P but jumps 1 argument backward.'
    192 
    193 `~C'
    194 
    195     Character.
    196 
    197    `~@C'
    198 
    199          prints a character as the reader can understand it (i.e. `#\' prefixing).
    200 
    201    `~:C'
    202 
    203          prints a character as emacs does (eg. `^C' for ASCII 03).
    204 
    205 `~F'
    206 
    207     Fixed-format floating-point (prints a flonum like MMM.NNN).
    208 
    209    `~WIDTH,DIGITS,SCALE,OVERFLOWCHAR,PADCHARF'
    210 
    211    `~@F'
    212          If the number is positive a plus sign is printed.
    213 
    214 `~E'
    215 
    216     Exponential floating-point (prints a flonum like MMM.NNN`E'EE).
    217 
    218    `~WIDTH,DIGITS,EXPONENTDIGITS,SCALE,OVERFLOWCHAR,PADCHAR,EXPONENTCHARE'
    219 
    220    `~@E'
    221 
    222          If the number is positive a plus sign is printed.
    223 
    224 `~G'
    225 
    226     General floating-point (prints a flonum either fixed or exponential).
    227 
    228    `~WIDTH,DIGITS,EXPONENTDIGITS,SCALE,OVERFLOWCHAR,PADCHAR,EXPONENTCHARG'
    229 
    230    `~@G'
    231 
    232          If the number is positive a plus sign is printed.
    233 
    234 `~$'
    235 
    236     Dollars floating-point (prints a flonum in fixed with signs separated).
    237 
    238    `~DIGITS,SCALE,WIDTH,PADCHAR$'
    239 
    240    `~@$'
    241 
    242          If the number is positive a plus sign is printed.
    243 
    244    `~:@$'
    245 
    246          A sign is always printed and appears before the padding.
    247 
    248    `~:$'
    249 
    250          The sign appears before the padding.
    251 
    252 `~%'
    253 
    254     Newline.
    255 
    256    `~N%'
    257 
    258          print N newlines.
    259 
    260 `~&'
    261 
    262     print newline if not at the beginning of the output line.
    263 
    264    `~N&'
    265 
    266          prints `~&' and then N-1 newlines.
    267 
    268 `~|'
    269 
    270     Page Separator.
    271 
    272    `~N|'
    273 
    274          print N page separators.
    275 
    276 `~~'
    277 
    278     Tilde.
    279 
    280    `~N~'
    281 
    282          print N tildes.
    283 
    284 `~'<newline>
    285 
    286     Continuation Line.
    287 
    288    `~:'<newline>
    289 
    290          newline is ignored, white space left.
    291 
    292    `~@'<newline>
    293 
    294          newline is left, white space ignored.
    295 
    296 `~T'
    297 
    298     Tabulation.
    299 
    300    `~@T'
    301 
    302          relative tabulation.
    303 
    304    `~COLNUM,COLINCT'
    305 
    306          full tabulation.
    307 
    308 `~?'
    309 
    310     Indirection (expects indirect arguments as a list).
    311 
    312    `~@?'
    313 
    314          extracts indirect arguments from format arguments.
    315 
    316 `~(STR~)'
    317 
    318     Case conversion (converts by `string-downcase').
    319 
    320    `~:(STR~)'
    321 
    322          converts by `string-capitalize'.
    323 
    324    `~@(STR~)'
    325 
    326          converts by `string-capitalize-first'.
    327 
    328    `~:@(STR~)'
    329 
    330          converts by `string-upcase'.
    331 
    332 `~*'
    333 
    334     Argument Jumping (jumps 1 argument forward).
    335 
    336    `~N*'
    337 
    338          jumps N arguments forward.
    339 
    340    `~:*'
    341 
    342          jumps 1 argument backward.
    343 
    344    `~N:*'
    345 
    346          jumps N arguments backward.
    347 
    348    `~@*'
    349 
    350          jumps to the 0th argument.
    351 
    352    `~N@*'
    353 
    354          jumps to the Nth argument (beginning from 0)
    355 
    356 `~[STR0~;STR1~;...~;STRN~]'
    357 
    358     Conditional Expression (numerical clause conditional).
    359 
    360    `~N['
    361 
    362          take argument from N.
    363 
    364    `~@['
    365 
    366          true test conditional.
    367 
    368    `~:['
    369 
    370          if-else-then conditional.
    371 
    372    `~;'
    373 
    374          clause separator.
    375 
    376    `~:;'
    377 
    378          default clause follows.
    379 
    380 `~{STR~}'
    381 
    382     Iteration (args come from the next argument (a list)). Iteration
    383     bounding is controlled by configuration variables
    384     format:iteration-bounded and format:max-iterations. With both variables
    385     default, a maximum of 100 iterations will be performed.
    386 
    387    `~N{'
    388 
    389          at most N iterations.
    390 
    391    `~:{'
    392 
    393          args from next arg (a list of lists).
    394 
    395    `~@{'
    396 
    397          args from the rest of arguments.
    398 
    399    `~:@{'
    400 
    401          args from the rest args (lists).
    402 
    403 `~^'
    404     Up and out.
    405 
    406    `~N^'
    407 
    408          aborts if N = 0
    409 
    410    `~N,M^'
    411 
    412          aborts if N = M
    413 
    414    `~N,M,K^'
    415 
    416          aborts if N <= M <= K
    417 
    418 Not Implemented CL Format Control Directives
    419 ............................................
    420 
    421 `~:A'
    422 
    423     print `#f' as an empty list (see below).
    424 
    425 `~:S'
    426 
    427     print `#f' as an empty list (see below).
    428 
    429 `~<~>'
    430 
    431     Justification.
    432 
    433 `~:^'
    434 
    435     (sorry I don't understand its semantics completely)
    436 
    437 Extended, Replaced and Additional Control Directives
    438 ....................................................
    439 
    440 `~MINCOL,PADCHAR,COMMACHAR,COMMAWIDTHD'
    441 
    442 `~MINCOL,PADCHAR,COMMACHAR,COMMAWIDTHX'
    443 
    444 `~MINCOL,PADCHAR,COMMACHAR,COMMAWIDTHO'
    445 
    446 `~MINCOL,PADCHAR,COMMACHAR,COMMAWIDTHB'
    447 
    448 `~N,MINCOL,PADCHAR,COMMACHAR,COMMAWIDTHR'
    449 
    450     COMMAWIDTH is the number of characters between two comma
    451     characters.
    452 
    453 `~I'
    454     print a R4RS complex number as `~F~@Fi' with passed parameters for
    455     `~F'.
    456 
    457 `~Y'
    458 
    459     Pretty print formatting of an argument for scheme code lists.
    460 
    461 `~K'
    462 
    463     Same as `~?.'
    464 
    465 `~!'
    466 
    467     Flushes the output if format DESTINATION is a port.
    468 
    469 `~_'
    470 
    471     Print a `#\space' character
    472 
    473    `~N_'
    474          print N `#\space' characters.
    475 
    476 `~/'
    477 
    478     Print a `#\tab' character
    479 
    480    `~N/'
    481          print N `#\tab' characters.
    482 
    483 `~NC'
    484 
    485     Takes N as an integer representation for a character. No arguments
    486     are consumed. N is converted to a character by `integer->char'.  N
    487     must be a positive decimal number.
    488 
    489 `~:S'
    490 
    491     Print out readproof.  Prints out internal objects represented as
    492     `#<...>' as strings `"#<...>"' so that the format output can always
    493     be processed by `read'.
    494 
    495 `~:A'
    496 
    497     Print out readproof.  Prints out internal objects represented as
    498     `#<...>' as strings `"#<...>"' so that the format output can always
    499     be processed by `read'.
    500 
    501 `~Q'
    502 
    503     Prints information and a copyright notice on the format
    504     implementation.
    505 
    506    `~:Q'
    507          prints format version.
    508 
    509 `~F, ~E, ~G, ~$'
    510 
    511     May also print number strings, i.e. passing a number as a string and
    512     format it accordingly.
    513 
    514 Configuration Variables
    515 -----------------------
    516 
    517 Format has some configuration variables. There should be no modification
    518 necessary for the default configuration. If modification is desired the
    519 variable should be set after the format code is loaded.
    520 
    521 format:floats
    522 
    523     System has floating-point numbers. (default #t)
    524 
    525 format:complex-numbers
    526 
    527     System has complex numbers. (default #f)
    528 
    529 format:fn-max
    530 
    531     Maximum number of number digits. (default 200)
    532 
    533 format:format:en-max
    534 
    535     Maximum number of exponent digits. (default 10)
    536 
    537 format:expch
    538 
    539     The character prefixing the exponent value in ~E printing.
    540     (default #\E)
    541 
    542 format:radix-pref
    543 
    544     Does number->string add a radix prefix? (default <detects upon load>)
    545 
    546 format:symbol-case-conv
    547 
    548     Symbols are converted by symbol->string so the case type of the
    549     printed symbols is implementation dependent.
    550     format:symbol-case-conv is a one arg closure which is either #f (no
    551     conversion), string-upcase, string-downcase or string-capitalize.
    552     (default #f)
    553 
    554 format:iobj-case-conv
    555 
    556     As format:symbol-case-conv but applies for the representation of
    557     implementation internal objects. (default #f)
    558 
    559 format:iteration-bounded
    560 
    561     When #t, a ~{...~} control will iterate no more than the number of
    562     times specified by format:max-iterations regardless of the number
    563     of iterations implied by modifiers and arguments. When #f, a
    564     ~{...~} control will iterate the number of times implied by
    565     modifiers and arguments, unless termination is forced by language
    566     or system limitations. (default #t)
    567 
    568 format:max-iterations
    569 
    570     The maximum number of iterations performed by a ~{...~} control.
    571     Has effect only when format:iteration-bounded is #t. (default 100)
    572 
    573 format:unprocessed-arguments-error?
    574 
    575     Are superfluous arguments treated as an error. (default #f)
     39 Format Specification (Format version 3.1)
     40 -----------------------------------------
     41 
     42 Please consult a Common LISP format reference manual for a detailed
     43 description of the format string syntax.
     44 
     45 This implementation supports directive parameters and modifiers (`:' and `@'
     46 characters). Multiple parameters must be separated by a comma (`,').
     47 Parameters can be numerical parameters (positive or negative), character
     48 parameters (prefixed by a quote character (`''), variable parameters (`v'),
     49 number of rest arguments parameter (`#'), empty and default parameters.
     50 Directive characters are case independent.
     51 
     52 The general form of a directive is:
     53 
     54 DIRECTIVE ::= ~{DIRECTIVE-PARAMETER,}[:][@]DIRECTIVE-CHARACTER
     55 
     56 DIRECTIVE-PARAMETER ::= [ [-|+]{0-9}+ | 'CHARACTER | v | # ]
     57 
     58 Implemented CL Format Control Directives
     59 ........................................
     60 
     61 Documentation syntax: Uppercase characters represent the corresponding control
     62 directive characters. Lowercase characters represent control directive
     63 parameter descriptions.
     64 
     65 `~A'
     66 
     67     Any (print as `display' does).
     68 
     69    `~@A'
     70 
     71          left pad.
     72 
     73    `~MINCOL,COLINC,MINPAD,PADCHARA'
     74 
     75          full padding.
     76 
     77 `~S'
     78 
     79     S-expression (print as `write' does).
     80 
     81    `~@S'
     82 
     83          left pad.
     84 
     85    `~MINCOL,COLINC,MINPAD,PADCHARS'
     86 
     87          full padding.
     88 
     89 `~D'
     90 
     91     Decimal.
     92 
     93    `~@D'
     94 
     95          print number sign always.
     96 
     97    `~:D'
     98 
     99          print comma separated.
     100 
     101    `~MINCOL,PADCHAR,COMMACHARD'
     102 
     103          padding.
     104 
     105 `~X'
     106 
     107     Hexadecimal.
     108 
     109    `~@X'
     110 
     111          print number sign always.
     112 
     113    `~:X'
     114 
     115          print comma separated.
     116 
     117    `~MINCOL,PADCHAR,COMMACHARX'
     118 
     119          padding.
     120 
     121 `~O'
     122 
     123     Octal.
     124 
     125    `~@O'
     126 
     127          print number sign always.
     128 
     129    `~:O'
     130 
     131          print comma separated.
     132 
     133    `~MINCOL,PADCHAR,COMMACHARO'
     134 
     135          padding.
     136 
     137 `~B'
     138 
     139     Binary.
     140 
     141    `~@B'
     142 
     143          print number sign always.
     144 
     145    `~:B'
     146 
     147          print comma separated.
     148 
     149    `~MINCOL,PADCHAR,COMMACHARB'
     150 
     151          padding.
     152 
     153 `~NR'
     154 
     155     Radix N.
     156 
     157    `~N,MINCOL,PADCHAR,COMMACHARR'
     158 
     159          padding.
     160 
     161 `~@R'
     162 
     163     print a number as a Roman numeral.
     164 
     165 `~:@R'
     166 
     167     print a number as an "old fashioned" Roman numeral.
     168 
     169 `~:R'
     170 
     171     print a number as an ordinal English number.
     172 
     173 `~R'
     174 
     175     print a number as a cardinal English number.
     176 
     177 `~P'
     178 
     179     Plural.
     180 
     181    `~@P'
     182 
     183          prints `y' and `ies'.
     184 
     185    `~:P'
     186 
     187          as `~P but jumps 1 argument backward.'
     188 
     189    `~:@P'
     190 
     191          as `~@P but jumps 1 argument backward.'
     192 
     193 `~C'
     194 
     195     Character.
     196 
     197    `~@C'
     198 
     199          prints a character as the reader can understand it (i.e. `#\' prefixing).
     200 
     201    `~:C'
     202 
     203          prints a character as emacs does (eg. `^C' for ASCII 03).
     204 
     205 `~F'
     206 
     207     Fixed-format floating-point (prints a flonum like MMM.NNN).
     208 
     209    `~WIDTH,DIGITS,SCALE,OVERFLOWCHAR,PADCHARF'
     210 
     211    `~@F'
     212          If the number is positive a plus sign is printed.
     213 
     214 `~E'
     215 
     216     Exponential floating-point (prints a flonum like MMM.NNN`E'EE).
     217 
     218    `~WIDTH,DIGITS,EXPONENTDIGITS,SCALE,OVERFLOWCHAR,PADCHAR,EXPONENTCHARE'
     219 
     220    `~@E'
     221 
     222          If the number is positive a plus sign is printed.
     223 
     224 `~G'
     225 
     226     General floating-point (prints a flonum either fixed or exponential).
     227 
     228    `~WIDTH,DIGITS,EXPONENTDIGITS,SCALE,OVERFLOWCHAR,PADCHAR,EXPONENTCHARG'
     229 
     230    `~@G'
     231 
     232          If the number is positive a plus sign is printed.
     233 
     234 `~$'
     235 
     236     Dollars floating-point (prints a flonum in fixed with signs separated).
     237 
     238    `~DIGITS,SCALE,WIDTH,PADCHAR$'
     239 
     240    `~@$'
     241 
     242          If the number is positive a plus sign is printed.
     243 
     244    `~:@$'
     245 
     246          A sign is always printed and appears before the padding.
     247 
     248    `~:$'
     249 
     250          The sign appears before the padding.
     251 
     252 `~%'
     253 
     254     Newline.
     255 
     256    `~N%'
     257 
     258          print N newlines.
     259 
     260 `~&'
     261 
     262     print newline if not at the beginning of the output line.
     263 
     264    `~N&'
     265 
     266          prints `~&' and then N-1 newlines.
     267 
     268 `~|'
     269 
     270     Page Separator.
     271 
     272    `~N|'
     273 
     274          print N page separators.
     275 
     276 `~~'
     277 
     278     Tilde.
     279 
     280    `~N~'
     281 
     282          print N tildes.
     283 
     284 `~'<newline>
     285 
     286     Continuation Line.
     287 
     288    `~:'<newline>
     289 
     290          newline is ignored, white space left.
     291 
     292    `~@'<newline>
     293 
     294          newline is left, white space ignored.
     295 
     296 `~T'
     297 
     298     Tabulation.
     299 
     300    `~@T'
     301 
     302          relative tabulation.
     303 
     304    `~COLNUM,COLINCT'
     305 
     306          full tabulation.
     307 
     308 `~?'
     309 
     310     Indirection (expects indirect arguments as a list).
     311 
     312    `~@?'
     313 
     314          extracts indirect arguments from format arguments.
     315 
     316 `~(STR~)'
     317 
     318     Case conversion (converts by `string-downcase').
     319 
     320    `~:(STR~)'
     321 
     322          converts by `string-capitalize'.
     323 
     324    `~@(STR~)'
     325 
     326          converts by `string-capitalize-first'.
     327 
     328    `~:@(STR~)'
     329 
     330          converts by `string-upcase'.
     331 
     332 `~*'
     333 
     334     Argument Jumping (jumps 1 argument forward).
     335 
     336    `~N*'
     337 
     338          jumps N arguments forward.
     339 
     340    `~:*'
     341 
     342          jumps 1 argument backward.
     343 
     344    `~N:*'
     345 
     346          jumps N arguments backward.
     347 
     348    `~@*'
     349 
     350          jumps to the 0th argument.
     351 
     352    `~N@*'
     353 
     354          jumps to the Nth argument (beginning from 0)
     355 
     356 `~[STR0~;STR1~;...~;STRN~]'
     357 
     358     Conditional Expression (numerical clause conditional).
     359 
     360    `~N['
     361 
     362          take argument from N.
     363 
     364    `~@['
     365 
     366          true test conditional.
     367 
     368    `~:['
     369 
     370          if-else-then conditional.
     371 
     372    `~;'
     373 
     374          clause separator.
     375 
     376    `~:;'
     377 
     378          default clause follows.
     379 
     380 `~{STR~}'
     381 
     382     Iteration (args come from the next argument (a list)). Iteration
     383     bounding is controlled by configuration variables
     384     format:iteration-bounded and format:max-iterations. With both variables
     385     default, a maximum of 100 iterations will be performed.
     386 
     387    `~N{'
     388 
     389          at most N iterations.
     390 
     391    `~:{'
     392 
     393          args from next arg (a list of lists).
     394 
     395    `~@{'
     396 
     397          args from the rest of arguments.
     398 
     399    `~:@{'
     400 
     401          args from the rest args (lists).
     402 
     403 `~^'
     404     Up and out.
     405 
     406    `~N^'
     407 
     408          aborts if N = 0
     409 
     410    `~N,M^'
     411 
     412          aborts if N = M
     413 
     414    `~N,M,K^'
     415 
     416          aborts if N <= M <= K
     417 
     418 Not Implemented CL Format Control Directives
     419 ............................................
     420 
     421 `~:A'
     422 
     423     print `#f' as an empty list (see below).
     424 
     425 `~:S'
     426 
     427     print `#f' as an empty list (see below).
     428 
     429 `~<~>'
     430 
     431     Justification.
     432 
     433 `~:^'
     434 
     435     (sorry I don't understand its semantics completely)
     436 
     437 Extended, Replaced and Additional Control Directives
     438 ....................................................
     439 
     440 `~MINCOL,PADCHAR,COMMACHAR,COMMAWIDTHD'
     441 
     442 `~MINCOL,PADCHAR,COMMACHAR,COMMAWIDTHX'
     443 
     444 `~MINCOL,PADCHAR,COMMACHAR,COMMAWIDTHO'
     445 
     446 `~MINCOL,PADCHAR,COMMACHAR,COMMAWIDTHB'
     447 
     448 `~N,MINCOL,PADCHAR,COMMACHAR,COMMAWIDTHR'
     449 
     450     COMMAWIDTH is the number of characters between two comma
     451     characters.
     452 
     453 `~I'
     454     print a R4RS complex number as `~F~@Fi' with passed parameters for
     455     `~F'.
     456 
     457 `~Y'
     458 
     459     Pretty print formatting of an argument for scheme code lists.
     460 
     461 `~K'
     462 
     463     Same as `~?.'
     464 
     465 `~!'
     466 
     467     Flushes the output if format DESTINATION is a port.
     468 
     469 `~_'
     470 
     471     Print a `#\space' character
     472 
     473    `~N_'
     474          print N `#\space' characters.
     475 
     476 `~/'
     477 
     478     Print a `#\tab' character
     479 
     480    `~N/'
     481          print N `#\tab' characters.
     482 
     483 `~NC'
     484 
     485     Takes N as an integer representation for a character. No arguments
     486     are consumed. N is converted to a character by `integer->char'.  N
     487     must be a positive decimal number.
     488 
     489 `~:S'
     490 
     491     Print out readproof.  Prints out internal objects represented as
     492     `#<...>' as strings `"#<...>"' so that the format output can always
     493     be processed by `read'.
     494 
     495 `~:A'
     496 
     497     Print out readproof.  Prints out internal objects represented as
     498     `#<...>' as strings `"#<...>"' so that the format output can always
     499     be processed by `read'.
     500 
     501 `~Q'
     502 
     503     Prints information and a copyright notice on the format
     504     implementation.
     505 
     506    `~:Q'
     507          prints format version.
     508 
     509 `~F, ~E, ~G, ~$'
     510 
     511     May also print number strings, i.e. passing a number as a string and
     512     format it accordingly.
     513 
     514 Configuration Variables
     515 -----------------------
     516 
     517 Format has some configuration variables. There should be no modification
     518 necessary for the default configuration. If modification is desired the
     519 variable should be set after the format code is loaded.
     520 
     521 format:floats
     522 
     523     System has floating-point numbers. (default #t)
     524 
     525 format:complex-numbers
     526 
     527     System has complex numbers. (default #f)
     528 
     529 format:fn-max
     530 
     531     Maximum number of number digits. (default 200)
     532 
     533 format:format:en-max
     534 
     535     Maximum number of exponent digits. (default 10)
     536 
     537 format:expch
     538 
     539     The character prefixing the exponent value in ~E printing.
     540     (default #\E)
     541 
     542 format:radix-pref
     543 
     544     Does number->string add a radix prefix? (default <detects upon load>)
     545 
     546 format:symbol-case-conv
     547 
     548     Symbols are converted by symbol->string so the case type of the
     549     printed symbols is implementation dependent.
     550     format:symbol-case-conv is a one arg closure which is either #f (no
     551     conversion), string-upcase, string-downcase or string-capitalize.
     552     (default #f)
     553 
     554 format:iobj-case-conv
     555 
     556     As format:symbol-case-conv but applies for the representation of
     557     implementation internal objects. (default #f)
     558 
     559 format:iteration-bounded
     560 
     561     When #t, a ~{...~} control will iterate no more than the number of
     562     times specified by format:max-iterations regardless of the number
     563     of iterations implied by modifiers and arguments. When #f, a
     564     ~{...~} control will iterate the number of times implied by
     565     modifiers and arguments, unless termination is forced by language
     566     or system limitations. (default #t)
     567 
     568 format:max-iterations
     569 
     570     The maximum number of iterations performed by a ~{...~} control.
     571     Has effect only when format:iteration-bounded is #t. (default 100)
     572 
     573 format:unprocessed-arguments-error?
     574 
     575     Are superfluous arguments treated as an error. (default #f)
    576576
    577577
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