| 1 | #!/usr/bin/env python2
|
| 2 | """
|
| 3 | Pretty print Oils values (and later other data/languages as well).
|
| 4 |
|
| 5 | Pretty printing means intelligently choosing whitespace including indentation
|
| 6 | and newline placement, to attempt to display data nicely while staying within a
|
| 7 | maximum line width.
|
| 8 | """
|
| 9 |
|
| 10 | # ~~~ Architecture ~~~
|
| 11 | #
|
| 12 | # Based on a version of the algorithm from Wadler's "A Prettier Printer".
|
| 13 | #
|
| 14 | # Pretty printing proceeds in two phases:
|
| 15 | #
|
| 16 | # 1. Convert the thing you want to print into a `doc`.
|
| 17 | # 2. Print the `doc` using a standard algorithm.
|
| 18 | #
|
| 19 | # This separation keeps the details of the data you want to print separate from
|
| 20 | # the printing algorithm.
|
| 21 |
|
| 22 | # ~~~ Pretty Printing Overview ~~~
|
| 23 | #
|
| 24 | # If you're just using this file, you don't need to know how pretty printing
|
| 25 | # works. Just call `PrettyPrinter().PrintValue()`. However if you want to change
|
| 26 | # or extend how values are printed, you'll need to know, so here's an overview.
|
| 27 | #
|
| 28 | # You may want to first read Walder's "A Prettier Printer", which this is based
|
| 29 | # off of:
|
| 30 | # https://homepages.inf.ed.ac.uk/wadler/papers/prettier/prettier.pdf
|
| 31 | #
|
| 32 | # Some additional reading, though only tangentially related:
|
| 33 | #
|
| 34 | # - https://homepages.inf.ed.ac.uk/wadler/papers/prettier/prettier.pdf
|
| 35 | # - https://lindig.github.io/papers/strictly-pretty-2000.pdf
|
| 36 | # - https://justinpombrio.net/2024/02/23/a-twist-on-Wadlers-printer.html
|
| 37 | # - https://lobste.rs/s/1r0aak/twist_on_wadler_s_printer
|
| 38 | # - https://lobste.rs/s/aevptj/why_is_prettier_rock_solid
|
| 39 | #
|
| 40 | # ~ Constructors ~
|
| 41 | #
|
| 42 | # There are just a few constructors for `doc`, from which everything else is
|
| 43 | # built from.
|
| 44 | #
|
| 45 | # Text(string) prints like:
|
| 46 | # |string
|
| 47 | #
|
| 48 | # Break(string) prints like:
|
| 49 | # |string
|
| 50 | # or like a newline:
|
| 51 | # |
|
| 52 | # |
|
| 53 | # (It does the latter if printed in "flat" mode, and the former otherwise. See
|
| 54 | # Group for details.)
|
| 55 | #
|
| 56 | # Concat(a, b) prints like:
|
| 57 | # |AAAAA
|
| 58 | # |AAABBB
|
| 59 | # |BBBBB
|
| 60 | #
|
| 61 | # Indent(3, a) prints like:
|
| 62 | # |AAAAA
|
| 63 | # | AAAAA
|
| 64 | # | AAAAA
|
| 65 | #
|
| 66 | # Group(a) makes a decision. It either:
|
| 67 | # - Prints `a` "flat", meaning that (i) every Break inside of it is printed as a
|
| 68 | # string instead of as a newline, and (ii) every Group nested inside of it is
|
| 69 | # printed flat.
|
| 70 | # - Prints `a` normally, meaning that (i) the Breaks inside of it are printed as
|
| 71 | # newlines, and (ii) the Groups inside of it make their own decision about
|
| 72 | # whether to be flat.
|
| 73 | # It makes this decision greedily. If the current line would not overflow if the
|
| 74 | # group printed flat, then it will print flat. This takes into account not only
|
| 75 | # the group itself, but the content before and after it on the same line.
|
| 76 | #
|
| 77 | # IfFlat(a, b) prints a if in flat mode or b otherwise.
|
| 78 | #
|
| 79 | # ~ Measures ~
|
| 80 | #
|
| 81 | # The algorithm used here is close to the one originally described by Wadler,
|
| 82 | # but it precomputes a "measure" for each node in the `doc`. This "measure"
|
| 83 | # allows each Groups to decide whether to print flat or not without needing to
|
| 84 | # look ahead per Wadler's algorithm. A measure has two pieces of information:
|
| 85 | #
|
| 86 | # - Measure.flat is the width of the doc if it's printed flat.
|
| 87 | # - Measure.nonflat is the width of the doc until the _earliest possible_
|
| 88 | # newline, or -1 if it doesn't contain a Break.
|
| 89 | #
|
| 90 | # Measures are used in two steps. First, they're computed bottom-up on the
|
| 91 | # `doc`, measuring the size of each node. Later, _PrintDoc() stores a measure in
|
| 92 | # each DocFragment. These Measures measure something different: the width from
|
| 93 | # the doc _to the end of the entire doc tree_. This second set of Measures (the
|
| 94 | # ones in the DocFragments) are computed top-down, and they're used to decide
|
| 95 | # for each Group whether to use flat mode or not, without needing to scan ahead.
|
| 96 |
|
| 97 | from __future__ import print_function
|
| 98 |
|
| 99 | from _devbuild.gen.pretty_asdl import doc, doc_e, DocFragment, Measure, MeasuredDoc
|
| 100 | from _devbuild.gen.value_asdl import value, value_e, value_t, value_str
|
| 101 | from data_lang.j8 import ValueIdString, HeapValueId
|
| 102 | from core import ansi
|
| 103 | from frontend import match
|
| 104 | from mycpp import mops
|
| 105 | from mycpp.mylib import log, tagswitch, BufWriter, iteritems
|
| 106 | from typing import cast, List, Dict
|
| 107 | import fastfunc
|
| 108 | import libc
|
| 109 |
|
| 110 | _ = log
|
| 111 |
|
| 112 | ################
|
| 113 | # Measurements #
|
| 114 | ################
|
| 115 |
|
| 116 |
|
| 117 | def TryUnicodeWidth(s):
|
| 118 | # type: (str) -> int
|
| 119 | try:
|
| 120 | width = libc.wcswidth(s)
|
| 121 | except UnicodeError:
|
| 122 | # e.g. en_US.UTF-8 locale missing, just return the number of bytes
|
| 123 | width = len(s)
|
| 124 |
|
| 125 | if width == -1: # non-printable wide char
|
| 126 | return len(s)
|
| 127 |
|
| 128 | return width
|
| 129 |
|
| 130 |
|
| 131 | def _EmptyMeasure():
|
| 132 | # type: () -> Measure
|
| 133 | """The measure of an empty doc."""
|
| 134 | return Measure(0, -1)
|
| 135 |
|
| 136 |
|
| 137 | def _FlattenMeasure(measure):
|
| 138 | # type: (Measure) -> Measure
|
| 139 | """The measure if its document is rendered flat."""
|
| 140 | return Measure(measure.flat, -1)
|
| 141 |
|
| 142 |
|
| 143 | def _ConcatMeasure(m1, m2):
|
| 144 | # type: (Measure, Measure) -> Measure
|
| 145 | """Compute the measure of concatenated docs.
|
| 146 |
|
| 147 | If m1 and m2 are the measures of doc1 and doc2,
|
| 148 | then _ConcatMeasure(m1, m2) is the measure of doc.Concat([doc1, doc2]).
|
| 149 | This concatenation is associative but not commutative."""
|
| 150 | if m1.nonflat != -1:
|
| 151 | return Measure(m1.flat + m2.flat, m1.nonflat)
|
| 152 | elif m2.nonflat != -1:
|
| 153 | return Measure(m1.flat + m2.flat, m1.flat + m2.nonflat)
|
| 154 | else:
|
| 155 | return Measure(m1.flat + m2.flat, -1)
|
| 156 |
|
| 157 |
|
| 158 | def _SuffixLen(measure):
|
| 159 | # type: (Measure) -> int
|
| 160 | """The width until the earliest possible newline, or end of document."""
|
| 161 | if measure.nonflat != -1:
|
| 162 | return measure.nonflat
|
| 163 | else:
|
| 164 | return measure.flat
|
| 165 |
|
| 166 |
|
| 167 | ####################
|
| 168 | # Doc Construction #
|
| 169 | ####################
|
| 170 |
|
| 171 |
|
| 172 | def _Text(string):
|
| 173 | # type: (str) -> MeasuredDoc
|
| 174 | """Print `string` (which must not contain a newline)."""
|
| 175 | return MeasuredDoc(doc.Text(string), Measure(TryUnicodeWidth(string), -1))
|
| 176 |
|
| 177 |
|
| 178 | def _Break(string):
|
| 179 | # type: (str) -> MeasuredDoc
|
| 180 | """If in `flat` mode, print `string`, otherwise print `\n`."""
|
| 181 | return MeasuredDoc(doc.Break(string), Measure(TryUnicodeWidth(string), 0))
|
| 182 |
|
| 183 |
|
| 184 | def _Indent(indent, mdoc):
|
| 185 | # type: (int, MeasuredDoc) -> MeasuredDoc
|
| 186 | """Add `indent` spaces after every newline in `mdoc`."""
|
| 187 | return MeasuredDoc(doc.Indent(indent, mdoc), mdoc.measure)
|
| 188 |
|
| 189 |
|
| 190 | def _Concat(mdocs):
|
| 191 | # type: (List[MeasuredDoc]) -> MeasuredDoc
|
| 192 | """Print the mdocs in order (with no space in between)."""
|
| 193 | measure = _EmptyMeasure()
|
| 194 | for mdoc in mdocs:
|
| 195 | measure = _ConcatMeasure(measure, mdoc.measure)
|
| 196 | return MeasuredDoc(doc.Concat(mdocs), measure)
|
| 197 |
|
| 198 |
|
| 199 | def _Group(mdoc):
|
| 200 | # type: (MeasuredDoc) -> MeasuredDoc
|
| 201 | """Print `mdoc`. Use flat mode if `mdoc` will fit on the current line."""
|
| 202 | return MeasuredDoc(doc.Group(mdoc), mdoc.measure)
|
| 203 |
|
| 204 |
|
| 205 | def _IfFlat(flat_mdoc, nonflat_mdoc):
|
| 206 | # type: (MeasuredDoc, MeasuredDoc) -> MeasuredDoc
|
| 207 | """If in flat mode, print `flat_mdoc` otherwise print `nonflat_mdoc`."""
|
| 208 | return MeasuredDoc(
|
| 209 | doc.IfFlat(flat_mdoc, nonflat_mdoc),
|
| 210 | Measure(flat_mdoc.measure.flat, nonflat_mdoc.measure.nonflat))
|
| 211 |
|
| 212 |
|
| 213 | ###################
|
| 214 | # Pretty Printing #
|
| 215 | ###################
|
| 216 |
|
| 217 | _DEFAULT_MAX_WIDTH = 80
|
| 218 | _DEFAULT_INDENTATION = 4
|
| 219 | _DEFAULT_USE_STYLES = True
|
| 220 | _DEFAULT_SHOW_TYPE_PREFIX = True
|
| 221 |
|
| 222 | # Tuned for 'data_lang/pretty-benchmark.sh float-demo'
|
| 223 | # TODO: might want options for float width
|
| 224 | _DEFAULT_MAX_TABULAR_WIDTH = 22
|
| 225 |
|
| 226 |
|
| 227 | class PrettyPrinter(object):
|
| 228 | """Pretty print an Oils value."""
|
| 229 |
|
| 230 | def __init__(self):
|
| 231 | # type: () -> None
|
| 232 | """Construct a PrettyPrinter with default configuration options.
|
| 233 |
|
| 234 | Use the Set*() methods for configuration before printing."""
|
| 235 | self.max_width = _DEFAULT_MAX_WIDTH
|
| 236 | self.indent = _DEFAULT_INDENTATION
|
| 237 | self.use_styles = _DEFAULT_USE_STYLES
|
| 238 | self.show_type_prefix = _DEFAULT_SHOW_TYPE_PREFIX
|
| 239 | self.max_tabular_width = _DEFAULT_MAX_TABULAR_WIDTH
|
| 240 |
|
| 241 | def SetMaxWidth(self, max_width):
|
| 242 | # type: (int) -> None
|
| 243 | """Set the maximum line width.
|
| 244 |
|
| 245 | Pretty printing will attempt to (but does not guarantee to) fit the doc
|
| 246 | within this width.
|
| 247 | """
|
| 248 | self.max_width = max_width
|
| 249 |
|
| 250 | def SetIndent(self, indent):
|
| 251 | # type: (int) -> None
|
| 252 | """Set the number of spaces per indentation level."""
|
| 253 | self.indent = indent
|
| 254 |
|
| 255 | def SetUseStyles(self, use_styles):
|
| 256 | # type: (bool) -> None
|
| 257 | """If true, print with ansi colors and styles. Otherwise print with plain text."""
|
| 258 | self.use_styles = use_styles
|
| 259 |
|
| 260 | def SetShowTypePrefix(self, show_type_prefix):
|
| 261 | # type: (bool) -> None
|
| 262 | """Set whether or not to print a type before the top-level value.
|
| 263 |
|
| 264 | E.g. `(Bool) true`"""
|
| 265 | self.show_type_prefix = show_type_prefix
|
| 266 |
|
| 267 | def SetMaxTabularWidth(self, max_tabular_width):
|
| 268 | # type: (int) -> None
|
| 269 | """Set the maximum width that list elements can be, for them to be
|
| 270 | vertically aligned."""
|
| 271 | self.max_tabular_width = max_tabular_width
|
| 272 |
|
| 273 | def PrintValue(self, val, buf):
|
| 274 | # type: (value_t, BufWriter) -> None
|
| 275 | """Pretty print an Oils value to a BufWriter."""
|
| 276 | constructor = _DocConstructor(self.indent, self.use_styles,
|
| 277 | self.show_type_prefix,
|
| 278 | self.max_tabular_width)
|
| 279 | document = constructor.Value(val)
|
| 280 | self._PrintDoc(document, buf)
|
| 281 |
|
| 282 | def _Fits(self, prefix_len, group, suffix_measure):
|
| 283 | # type: (int, doc.Group, Measure) -> bool
|
| 284 | """Will `group` fit flat on the current line?"""
|
| 285 | measure = _ConcatMeasure(_FlattenMeasure(group.mdoc.measure),
|
| 286 | suffix_measure)
|
| 287 | return prefix_len + _SuffixLen(measure) <= self.max_width
|
| 288 |
|
| 289 | def _PrintDoc(self, document, buf):
|
| 290 | # type: (MeasuredDoc, BufWriter) -> None
|
| 291 | """Pretty print a `pretty.doc` to a BufWriter."""
|
| 292 |
|
| 293 | # The width of the text we've printed so far on the current line
|
| 294 | prefix_len = 0
|
| 295 | # A _stack_ of document fragments to print. Each fragment contains:
|
| 296 | # - A MeasuredDoc (doc node and its measure, saying how "big" it is)
|
| 297 | # - The indentation level to print this doc node at.
|
| 298 | # - Is this doc node being printed in flat mode?
|
| 299 | # - The measure _from just after the doc node, to the end of the entire document_.
|
| 300 | # (Call this the suffix_measure)
|
| 301 | fragments = [DocFragment(_Group(document), 0, False, _EmptyMeasure())]
|
| 302 |
|
| 303 | while len(fragments) > 0:
|
| 304 | frag = fragments.pop()
|
| 305 | with tagswitch(frag.mdoc.doc) as case:
|
| 306 |
|
| 307 | if case(doc_e.Text):
|
| 308 | text = cast(doc.Text, frag.mdoc.doc)
|
| 309 | buf.write(text.string)
|
| 310 | prefix_len += frag.mdoc.measure.flat
|
| 311 |
|
| 312 | elif case(doc_e.Break):
|
| 313 | if frag.is_flat:
|
| 314 | break_str = cast(doc.Break, frag.mdoc.doc).string
|
| 315 | buf.write(break_str)
|
| 316 | prefix_len += frag.mdoc.measure.flat
|
| 317 | else:
|
| 318 | buf.write('\n')
|
| 319 | buf.write_spaces(frag.indent)
|
| 320 | prefix_len = frag.indent
|
| 321 |
|
| 322 | elif case(doc_e.Indent):
|
| 323 | indented = cast(doc.Indent, frag.mdoc.doc)
|
| 324 | fragments.append(
|
| 325 | DocFragment(indented.mdoc,
|
| 326 | frag.indent + indented.indent,
|
| 327 | frag.is_flat, frag.measure))
|
| 328 |
|
| 329 | elif case(doc_e.Concat):
|
| 330 | # If we encounter Concat([A, B, C]) with a suffix measure M,
|
| 331 | # we need to push A,B,C onto the stack in reverse order:
|
| 332 | # - C, with suffix_measure = B.measure + A.measure + M
|
| 333 | # - B, with suffix_measure = A.measure + M
|
| 334 | # - A, with suffix_measure = M
|
| 335 | concat = cast(doc.Concat, frag.mdoc.doc)
|
| 336 | measure = frag.measure
|
| 337 | for mdoc in reversed(concat.mdocs):
|
| 338 | fragments.append(
|
| 339 | DocFragment(mdoc, frag.indent, frag.is_flat,
|
| 340 | measure))
|
| 341 | measure = _ConcatMeasure(mdoc.measure, measure)
|
| 342 |
|
| 343 | elif case(doc_e.Group):
|
| 344 | # If the group would fit on the current line when printed
|
| 345 | # flat, do so. Otherwise, print it non-flat.
|
| 346 | group = cast(doc.Group, frag.mdoc.doc)
|
| 347 | flat = self._Fits(prefix_len, group, frag.measure)
|
| 348 | fragments.append(
|
| 349 | DocFragment(group.mdoc, frag.indent, flat,
|
| 350 | frag.measure))
|
| 351 |
|
| 352 | elif case(doc_e.IfFlat):
|
| 353 | if_flat = cast(doc.IfFlat, frag.mdoc.doc)
|
| 354 | if frag.is_flat:
|
| 355 | subdoc = if_flat.flat_mdoc
|
| 356 | else:
|
| 357 | subdoc = if_flat.nonflat_mdoc
|
| 358 | fragments.append(
|
| 359 | DocFragment(subdoc, frag.indent, frag.is_flat,
|
| 360 | frag.measure))
|
| 361 |
|
| 362 |
|
| 363 | ################
|
| 364 | # Value -> Doc #
|
| 365 | ################
|
| 366 |
|
| 367 |
|
| 368 | class _DocConstructor:
|
| 369 | """Converts Oil values into `doc`s, which can then be pretty printed."""
|
| 370 |
|
| 371 | def __init__(self, indent, use_styles, show_type_prefix,
|
| 372 | max_tabular_width):
|
| 373 | # type: (int, bool, bool, int) -> None
|
| 374 | self.indent = indent
|
| 375 | self.use_styles = use_styles
|
| 376 | self.show_type_prefix = show_type_prefix
|
| 377 | self.max_tabular_width = max_tabular_width
|
| 378 | self.visiting = {} # type: Dict[int, bool]
|
| 379 |
|
| 380 | # These can be configurable later
|
| 381 | self.number_style = ansi.YELLOW
|
| 382 | self.null_style = ansi.BOLD + ansi.RED
|
| 383 | self.bool_style = ansi.BOLD + ansi.BLUE
|
| 384 | self.string_style = ansi.GREEN
|
| 385 | self.cycle_style = ansi.BOLD + ansi.MAGENTA
|
| 386 | self.type_style = ansi.CYAN
|
| 387 |
|
| 388 | def Value(self, val):
|
| 389 | # type: (value_t) -> MeasuredDoc
|
| 390 | """Convert an Oils value into a `doc`, which can then be pretty printed."""
|
| 391 | self.visiting.clear()
|
| 392 | if self.show_type_prefix:
|
| 393 | ysh_type = value_str(val.tag(), dot=False)
|
| 394 | return _Group(
|
| 395 | _Concat([
|
| 396 | _Text("(" + ysh_type + ")"),
|
| 397 | _Break(" "),
|
| 398 | self._Value(val)
|
| 399 | ]))
|
| 400 | else:
|
| 401 | return self._Value(val)
|
| 402 |
|
| 403 | def _Styled(self, style, mdoc):
|
| 404 | # type: (str, MeasuredDoc) -> MeasuredDoc
|
| 405 | """Apply the ANSI style string to the given node, if use_styles is set."""
|
| 406 | if self.use_styles:
|
| 407 | return _Concat([
|
| 408 | MeasuredDoc(doc.Text(style), _EmptyMeasure()), mdoc,
|
| 409 | MeasuredDoc(doc.Text(ansi.RESET), _EmptyMeasure())
|
| 410 | ])
|
| 411 | else:
|
| 412 | return mdoc
|
| 413 |
|
| 414 | def _Surrounded(self, open, mdoc, close):
|
| 415 | # type: (str, MeasuredDoc, str) -> MeasuredDoc
|
| 416 | """Print one of two options (using '[', ']' for open, close):
|
| 417 |
|
| 418 | ```
|
| 419 | [mdoc]
|
| 420 | ------
|
| 421 | [
|
| 422 | mdoc
|
| 423 | ]
|
| 424 | ```
|
| 425 | """
|
| 426 | return _Group(
|
| 427 | _Concat([
|
| 428 | _Text(open),
|
| 429 | _Indent(self.indent, _Concat([_Break(""), mdoc])),
|
| 430 | _Break(""),
|
| 431 | _Text(close)
|
| 432 | ]))
|
| 433 |
|
| 434 | def _SurroundedAndPrefixed(self, open, prefix, sep, mdoc, close):
|
| 435 | # type: (str, MeasuredDoc, str, MeasuredDoc, str) -> MeasuredDoc
|
| 436 | """Print one of two options
|
| 437 | (using '[', 'prefix', ':', 'mdoc', ']' for open, prefix, sep, mdoc, close):
|
| 438 |
|
| 439 | ```
|
| 440 | [prefix:mdoc]
|
| 441 | ------
|
| 442 | [prefix
|
| 443 | mdoc
|
| 444 | ]
|
| 445 | ```
|
| 446 | """
|
| 447 | return _Group(
|
| 448 | _Concat([
|
| 449 | _Text(open), prefix,
|
| 450 | _Indent(self.indent, _Concat([_Break(sep), mdoc])),
|
| 451 | _Break(""),
|
| 452 | _Text(close)
|
| 453 | ]))
|
| 454 |
|
| 455 | def _Join(self, items, sep, space):
|
| 456 | # type: (List[MeasuredDoc], str, str) -> MeasuredDoc
|
| 457 | """Join `items`, using either 'sep+space' or 'sep+newline' between them.
|
| 458 |
|
| 459 | E.g., if sep and space are ',' and '_', print one of these two cases:
|
| 460 | ```
|
| 461 | first,_second,_third
|
| 462 | ------
|
| 463 | first,
|
| 464 | second,
|
| 465 | third
|
| 466 | ```
|
| 467 | """
|
| 468 | seq = [] # type: List[MeasuredDoc]
|
| 469 | for i, item in enumerate(items):
|
| 470 | if i != 0:
|
| 471 | seq.append(_Text(sep))
|
| 472 | seq.append(_Break(space))
|
| 473 | seq.append(item)
|
| 474 | return _Concat(seq)
|
| 475 |
|
| 476 | def _Tabular(self, items, sep):
|
| 477 | # type: (List[MeasuredDoc], str) -> MeasuredDoc
|
| 478 | """Join `items` together, using one of three styles:
|
| 479 |
|
| 480 | (showing spaces as underscores for clarity)
|
| 481 | ```
|
| 482 | first,_second,_third,_fourth,_fifth,_sixth,_seventh,_eighth
|
| 483 | ------
|
| 484 | first,___second,__third,
|
| 485 | fourth,__fifth,___sixth,
|
| 486 | seventh,_eighth
|
| 487 | ------
|
| 488 | first,
|
| 489 | second,
|
| 490 | third,
|
| 491 | fourth,
|
| 492 | fifth,
|
| 493 | sixth,
|
| 494 | seventh,
|
| 495 | eighth
|
| 496 | ```
|
| 497 |
|
| 498 | The first "single line" style is used if the items fit on one line. The
|
| 499 | second "tabular' style is used if the flat width of all items is no
|
| 500 | greater than `self.max_tabular_width`. The third "multi line" style is
|
| 501 | used otherwise.
|
| 502 | """
|
| 503 |
|
| 504 | # Why not "just" use tabular alignment so long as two items fit on every
|
| 505 | # line? Because it isn't possible to check for that in the pretty
|
| 506 | # printing language. There are two sorts of conditionals we can do:
|
| 507 | #
|
| 508 | # A. Inside the pretty printing language, which supports exactly one
|
| 509 | # conditional: "does it fit on one line?".
|
| 510 | # B. Outside the pretty printing language we can run arbitrary Python
|
| 511 | # code, but we don't know how much space is available on the line
|
| 512 | # because it depends on the context in which we're printed, which may
|
| 513 | # vary.
|
| 514 | #
|
| 515 | # We're picking between the three styles, by using (A) to check if the
|
| 516 | # first style fits on one line, then using (B) with "are all the items
|
| 517 | # smaller than `self.max_tabular_width`?" to pick between style 2 and
|
| 518 | # style 3.
|
| 519 |
|
| 520 | if len(items) == 0:
|
| 521 | return _Text("")
|
| 522 |
|
| 523 | max_flat_len = 0
|
| 524 | seq = [] # type: List[MeasuredDoc]
|
| 525 | for i, item in enumerate(items):
|
| 526 | if i != 0:
|
| 527 | seq.append(_Text(sep))
|
| 528 | seq.append(_Break(" "))
|
| 529 | seq.append(item)
|
| 530 | max_flat_len = max(max_flat_len, item.measure.flat)
|
| 531 | non_tabular = _Concat(seq)
|
| 532 |
|
| 533 | sep_width = TryUnicodeWidth(sep)
|
| 534 | if max_flat_len + sep_width + 1 <= self.max_tabular_width:
|
| 535 | tabular_seq = [] # type: List[MeasuredDoc]
|
| 536 | for i, item in enumerate(items):
|
| 537 | tabular_seq.append(item)
|
| 538 | if i != len(items) - 1:
|
| 539 | padding = max_flat_len - item.measure.flat + 1
|
| 540 | tabular_seq.append(_Text(sep))
|
| 541 | tabular_seq.append(_Group(_Break(" " * padding)))
|
| 542 | tabular = _Concat(tabular_seq)
|
| 543 | return _Group(_IfFlat(non_tabular, tabular))
|
| 544 | else:
|
| 545 | return non_tabular
|
| 546 |
|
| 547 | def _DictKey(self, s):
|
| 548 | # type: (str) -> MeasuredDoc
|
| 549 | if match.IsValidVarName(s):
|
| 550 | return _Text(s)
|
| 551 | else:
|
| 552 | return _Text(fastfunc.J8EncodeString(s, True)) # lossy_json=True
|
| 553 |
|
| 554 | def _StringLiteral(self, s):
|
| 555 | # type: (str) -> MeasuredDoc
|
| 556 | return self._Styled(self.string_style,
|
| 557 | _Text(fastfunc.J8EncodeString(
|
| 558 | s, True))) # lossy_json=True
|
| 559 |
|
| 560 | def _BashStringLiteral(self, s):
|
| 561 | # type: (str) -> MeasuredDoc
|
| 562 | return self._Styled(self.string_style,
|
| 563 | _Text(fastfunc.ShellEncodeString(s, 0)))
|
| 564 |
|
| 565 | def _YshList(self, vlist):
|
| 566 | # type: (value.List) -> MeasuredDoc
|
| 567 | """Print a string literal."""
|
| 568 | if len(vlist.items) == 0:
|
| 569 | return _Text("[]")
|
| 570 | mdocs = [self._Value(item) for item in vlist.items]
|
| 571 | return self._Surrounded("[", self._Tabular(mdocs, ","), "]")
|
| 572 |
|
| 573 | def _YshDict(self, vdict):
|
| 574 | # type: (value.Dict) -> MeasuredDoc
|
| 575 | if len(vdict.d) == 0:
|
| 576 | return _Text("{}")
|
| 577 | mdocs = [] # type: List[MeasuredDoc]
|
| 578 | for k, v in iteritems(vdict.d):
|
| 579 | mdocs.append(
|
| 580 | _Concat([self._DictKey(k),
|
| 581 | _Text(": "),
|
| 582 | self._Value(v)]))
|
| 583 | return self._Surrounded("{", self._Join(mdocs, ",", " "), "}")
|
| 584 |
|
| 585 | def _BashArray(self, varray):
|
| 586 | # type: (value.BashArray) -> MeasuredDoc
|
| 587 | type_name = self._Styled(self.type_style, _Text("BashArray"))
|
| 588 | if len(varray.strs) == 0:
|
| 589 | return _Concat([_Text("("), type_name, _Text(")")])
|
| 590 | mdocs = [] # type: List[MeasuredDoc]
|
| 591 | for s in varray.strs:
|
| 592 | if s is None:
|
| 593 | mdocs.append(_Text("null"))
|
| 594 | else:
|
| 595 | mdocs.append(self._BashStringLiteral(s))
|
| 596 | return self._SurroundedAndPrefixed("(", type_name, " ",
|
| 597 | self._Tabular(mdocs, ""), ")")
|
| 598 |
|
| 599 | def _BashAssoc(self, vassoc):
|
| 600 | # type: (value.BashAssoc) -> MeasuredDoc
|
| 601 | type_name = self._Styled(self.type_style, _Text("BashAssoc"))
|
| 602 | if len(vassoc.d) == 0:
|
| 603 | return _Concat([_Text("("), type_name, _Text(")")])
|
| 604 | mdocs = [] # type: List[MeasuredDoc]
|
| 605 | for k2, v2 in iteritems(vassoc.d):
|
| 606 | mdocs.append(
|
| 607 | _Concat([
|
| 608 | _Text("["),
|
| 609 | self._BashStringLiteral(k2),
|
| 610 | _Text("]="),
|
| 611 | self._BashStringLiteral(v2)
|
| 612 | ]))
|
| 613 | return self._SurroundedAndPrefixed("(", type_name, " ",
|
| 614 | self._Join(mdocs, "", " "), ")")
|
| 615 |
|
| 616 | def _Value(self, val):
|
| 617 | # type: (value_t) -> MeasuredDoc
|
| 618 |
|
| 619 | with tagswitch(val) as case:
|
| 620 | if case(value_e.Null):
|
| 621 | return self._Styled(self.null_style, _Text("null"))
|
| 622 |
|
| 623 | elif case(value_e.Bool):
|
| 624 | b = cast(value.Bool, val).b
|
| 625 | return self._Styled(self.bool_style,
|
| 626 | _Text("true" if b else "false"))
|
| 627 |
|
| 628 | elif case(value_e.Int):
|
| 629 | i = cast(value.Int, val).i
|
| 630 | return self._Styled(self.number_style, _Text(mops.ToStr(i)))
|
| 631 |
|
| 632 | elif case(value_e.Float):
|
| 633 | f = cast(value.Float, val).f
|
| 634 | return self._Styled(self.number_style, _Text(str(f)))
|
| 635 |
|
| 636 | elif case(value_e.Str):
|
| 637 | s = cast(value.Str, val).s
|
| 638 | return self._StringLiteral(s)
|
| 639 |
|
| 640 | elif case(value_e.Range):
|
| 641 | r = cast(value.Range, val)
|
| 642 | return self._Styled(
|
| 643 | self.number_style,
|
| 644 | _Concat([
|
| 645 | _Text(str(r.lower)),
|
| 646 | _Text(" .. "),
|
| 647 | _Text(str(r.upper))
|
| 648 | ]))
|
| 649 |
|
| 650 | elif case(value_e.List):
|
| 651 | vlist = cast(value.List, val)
|
| 652 | heap_id = HeapValueId(vlist)
|
| 653 | if self.visiting.get(heap_id, False):
|
| 654 | return _Concat([
|
| 655 | _Text("["),
|
| 656 | self._Styled(self.cycle_style, _Text("...")),
|
| 657 | _Text("]")
|
| 658 | ])
|
| 659 | else:
|
| 660 | self.visiting[heap_id] = True
|
| 661 | result = self._YshList(vlist)
|
| 662 | self.visiting[heap_id] = False
|
| 663 | return result
|
| 664 |
|
| 665 | elif case(value_e.Dict):
|
| 666 | vdict = cast(value.Dict, val)
|
| 667 | heap_id = HeapValueId(vdict)
|
| 668 | if self.visiting.get(heap_id, False):
|
| 669 | return _Concat([
|
| 670 | _Text("{"),
|
| 671 | self._Styled(self.cycle_style, _Text("...")),
|
| 672 | _Text("}")
|
| 673 | ])
|
| 674 | else:
|
| 675 | self.visiting[heap_id] = True
|
| 676 | result = self._YshDict(vdict)
|
| 677 | self.visiting[heap_id] = False
|
| 678 | return result
|
| 679 |
|
| 680 | elif case(value_e.BashArray):
|
| 681 | varray = cast(value.BashArray, val)
|
| 682 | return self._BashArray(varray)
|
| 683 |
|
| 684 | elif case(value_e.BashAssoc):
|
| 685 | vassoc = cast(value.BashAssoc, val)
|
| 686 | return self._BashAssoc(vassoc)
|
| 687 |
|
| 688 | else:
|
| 689 | ysh_type = value_str(val.tag(), dot=False)
|
| 690 | id_str = ValueIdString(val)
|
| 691 | return self._Styled(self.type_style,
|
| 692 | _Text("<" + ysh_type + id_str + ">"))
|
| 693 |
|
| 694 |
|
| 695 | # vim: sw=4
|