| 1 | #!/usr/bin/env python2
|
| 2 | """
|
| 3 | j8.py: J8 Notation, a superset of JSON
|
| 4 |
|
| 5 | Later:
|
| 6 |
|
| 7 | - PrettyPrinter uses hnode.asdl?
|
| 8 | - color
|
| 9 | - line wrapping -- do this later
|
| 10 | - would like CONTRIBUTORS here
|
| 11 |
|
| 12 | - Unify with ASDL pretty printing - NIL8
|
| 13 | - {} [] are identical
|
| 14 | - () is for statically typed ASDL data
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| 15 | (command.Simple blame_tok:(...) words:[ ])
|
| 16 | although we are also using [] for typed ASDL arrays, not just JSON
|
| 17 | - object IDs
|
| 18 | - @ x123 can create an ID
|
| 19 | - ! x123 can reference an ID
|
| 20 | - <> can be for non-J8 data types? For the = operator
|
| 21 | - 'hi \(name)' interpolation is useful for code
|
| 22 |
|
| 23 | - Common between JSON8 and NIL8 - for writing by hand
|
| 24 | - comments - # line or // line (JSON5 uses // line, following JS)
|
| 25 | - unquoted identifier names - NIL8 could be more relaxed for (+ 1 (* 3 4))
|
| 26 | - commas
|
| 27 | - JSON8 could have trailing commas rule
|
| 28 | - NIL8 at least has no commas for [1 2 "hi"]
|
| 29 | """
|
| 30 |
|
| 31 | import math
|
| 32 |
|
| 33 | from _devbuild.gen.id_kind_asdl import Id, Id_t, Id_str
|
| 34 | from _devbuild.gen.value_asdl import (value, value_e, value_t, value_str)
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| 35 | from _devbuild.gen.nil8_asdl import (nvalue, nvalue_t)
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| 36 |
|
| 37 | from asdl import format as fmt
|
| 38 | from core import error
|
| 39 | from data_lang import pyj8
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| 40 | # dependency issue: consts.py pulls in frontend/option_def.py
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| 41 | from frontend import consts
|
| 42 | from frontend import match
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| 43 | from mycpp import mops
|
| 44 | from mycpp import mylib
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| 45 | from mycpp.mylib import tagswitch, iteritems, NewDict, log
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| 46 |
|
| 47 | import fastfunc
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| 48 |
|
| 49 | _ = log
|
| 50 |
|
| 51 | from typing import cast, Dict, List, Tuple, Optional
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| 52 |
|
| 53 |
|
| 54 | # COPIED from ui.ValType() to break dep
|
| 55 | def ValType(val):
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| 56 | # type: (value_t) -> str
|
| 57 | """For displaying type errors in the UI."""
|
| 58 |
|
| 59 | return value_str(val.tag(), dot=False)
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| 60 |
|
| 61 |
|
| 62 | if mylib.PYTHON:
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| 63 |
|
| 64 | def HeapValueId(val):
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| 65 | # type: (value_t) -> int
|
| 66 | """
|
| 67 | Python's id() returns the address, which is up to 64 bits.
|
| 68 |
|
| 69 | In C++ we can use the GC ID, which fits within 32 bits.
|
| 70 | """
|
| 71 | return id(val)
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| 72 |
|
| 73 |
|
| 74 | def ValueId(val):
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| 75 | # type: (value_t) -> int
|
| 76 | """
|
| 77 | Return an integer ID for object that:
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| 78 |
|
| 79 | 1. Can be used to determine whether 2 objects are the same, e.g. for
|
| 80 | List, Dict, Func, Proc, etc.
|
| 81 | 2. Will help detect object cycles
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| 82 |
|
| 83 | Primitives types like Int and Float don't have this notion. They're
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| 84 | immutable values that are copied and compared by value.
|
| 85 | """
|
| 86 | with tagswitch(val) as case:
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| 87 | if case(value_e.Null, value_e.Bool, value_e.Int, value_e.Float,
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| 88 | value_e.Str):
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| 89 | # These will not be on the heap if we switch to tagged pointers
|
| 90 | # Str is handled conservatively - when we add small string
|
| 91 | # optimization, some strings will be values, so we assume all are.
|
| 92 | return -1
|
| 93 | else:
|
| 94 | return HeapValueId(val)
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| 95 |
|
| 96 |
|
| 97 | def ValueIdString(val):
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| 98 | # type: (value_t) -> str
|
| 99 | """Used by pp value (42) and = 42"""
|
| 100 | heap_id = ValueId(val) # could be -1
|
| 101 | if heap_id == -1:
|
| 102 | return ''
|
| 103 | else:
|
| 104 | return ' 0x%s' % mylib.hex_lower(heap_id)
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| 105 |
|
| 106 |
|
| 107 | def Utf8Encode(code):
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| 108 | # type: (int) -> str
|
| 109 | """Return utf-8 encoded bytes from a unicode code point.
|
| 110 |
|
| 111 | Based on https://stackoverflow.com/a/23502707
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| 112 | """
|
| 113 | num_cont_bytes = 0
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| 114 |
|
| 115 | if code <= 0x7F:
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| 116 | return chr(code & 0x7F) # ASCII
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| 117 |
|
| 118 | elif code <= 0x7FF:
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| 119 | num_cont_bytes = 1
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| 120 | elif code <= 0xFFFF:
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| 121 | num_cont_bytes = 2
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| 122 | else:
|
| 123 | # What about the check code <= 0x10FFFF ?
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| 124 | # - it happens in statically parsed $'' u''
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| 125 | # - but not dynamically parsed echo -e / printf, following bash/zsh
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| 126 | num_cont_bytes = 3
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| 127 |
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| 128 | bytes_ = [] # type: List[int]
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| 129 | for _ in xrange(num_cont_bytes):
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| 130 | bytes_.append(0x80 | (code & 0x3F))
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| 131 | code >>= 6
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| 132 |
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| 133 | b = (0x1E << (6 - num_cont_bytes)) | (code & (0x3F >> num_cont_bytes))
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| 134 | bytes_.append(b)
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| 135 | bytes_.reverse()
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| 136 |
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| 137 | # mod 256 because Python ints don't wrap around!
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| 138 | tmp = [chr(b & 0xFF) for b in bytes_]
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| 139 | return ''.join(tmp)
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| 140 |
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| 141 |
|
| 142 | SHOW_CYCLES = 1 << 1 # show as [...] or {...} I think, with object ID
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| 143 | SHOW_NON_DATA = 1 << 2 # non-data objects like Eggex can be <Eggex 0xff>
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| 144 | LOSSY_JSON = 1 << 3 # JSON is lossy
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| 145 | INF_NAN_ARE_NULL = 1 << 4 # for JSON
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| 146 |
|
| 147 | # Hack until we fully translate
|
| 148 | assert pyj8.LOSSY_JSON == LOSSY_JSON
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| 149 |
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| 150 |
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| 151 | def _Print(val, buf, indent, options=0):
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| 152 | # type: (value_t, mylib.BufWriter, int, int) -> None
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| 153 | """
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| 154 | Args:
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| 155 | indent: number of spaces to indent, or -1 for everything on one line
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| 156 | """
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| 157 | p = InstancePrinter(buf, indent, options)
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| 158 | p.Print(val)
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| 159 |
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| 160 |
|
| 161 | def PrintMessage(val, buf, indent):
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| 162 | # type: (value_t, mylib.BufWriter, int) -> None
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| 163 | """ For json8 write (x) and toJson8()
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| 164 |
|
| 165 | Caller must handle error.Encode
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| 166 | """
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| 167 | _Print(val, buf, indent)
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| 168 |
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| 169 |
|
| 170 | def PrintJsonMessage(val, buf, indent):
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| 171 | # type: (value_t, mylib.BufWriter, int) -> None
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| 172 | """ For json write (x) and toJson()
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| 173 |
|
| 174 | Caller must handle error.Encode()
|
| 175 | Doesn't decay to b'' strings - will use Unicode replacement char.
|
| 176 | """
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| 177 | _Print(val, buf, indent, options=LOSSY_JSON | INF_NAN_ARE_NULL)
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| 178 |
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| 179 |
|
| 180 | def PrintLine(val, f):
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| 181 | # type: (value_t, mylib.Writer) -> None
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| 182 | """ For pp line (x) """
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| 183 |
|
| 184 | # error.Encode should be impossible - we show cycles and non-data
|
| 185 | buf = mylib.BufWriter()
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| 186 | _Print(val, buf, -1, options=SHOW_CYCLES | SHOW_NON_DATA)
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| 187 | f.write(buf.getvalue())
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| 188 | f.write('\n')
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| 189 |
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| 190 |
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| 191 | def EncodeString(s, buf, unquoted_ok=False):
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| 192 | # type: (str, mylib.BufWriter, bool) -> None
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| 193 | """ For pp proc, etc."""
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| 194 |
|
| 195 | if unquoted_ok and fastfunc.CanOmitQuotes(s):
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| 196 | buf.write(s)
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| 197 | return
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| 198 |
|
| 199 | _Print(value.Str(s), buf, -1)
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| 200 |
|
| 201 |
|
| 202 | def MaybeEncodeString(s):
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| 203 | # type: (str) -> str
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| 204 | """ For write --json8 $s and compexport """
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| 205 |
|
| 206 | # TODO: add unquoted_ok here?
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| 207 | # /usr/local/foo-bar/x.y/a_b
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| 208 |
|
| 209 | buf = mylib.BufWriter()
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| 210 | _Print(value.Str(s), buf, -1)
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| 211 | return buf.getvalue()
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| 212 |
|
| 213 |
|
| 214 | def MaybeEncodeJsonString(s):
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| 215 | # type: (str) -> str
|
| 216 | """ For write --json """
|
| 217 |
|
| 218 | # TODO: add unquoted_ok here?
|
| 219 | # /usr/local/foo-bar/x.y/a_b
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| 220 | buf = mylib.BufWriter()
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| 221 | _Print(value.Str(s), buf, -1, options=LOSSY_JSON)
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| 222 | return buf.getvalue()
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| 223 |
|
| 224 |
|
| 225 | # DFS traversal state
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| 226 | UNSEEN = 0
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| 227 | EXPLORING = 1
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| 228 | FINISHED = 2
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| 229 |
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| 230 |
|
| 231 | class InstancePrinter(object):
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| 232 | """Print a value tree as J8/JSON."""
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| 233 |
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| 234 | def __init__(self, buf, indent, options):
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| 235 | # type: (mylib.BufWriter, int, int) -> None
|
| 236 | self.buf = buf
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| 237 | self.indent = indent
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| 238 | self.options = options
|
| 239 |
|
| 240 | # Key is vm.HeapValueId(val)
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| 241 | # Value is always True
|
| 242 | # Dict[int, None] doesn't translate -- it would be nice to have a set()
|
| 243 | self.visited = {} # type: Dict[int, int]
|
| 244 |
|
| 245 | def _ItemIndent(self, level):
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| 246 | # type: (int) -> None
|
| 247 |
|
| 248 | if self.indent == -1:
|
| 249 | return
|
| 250 |
|
| 251 | self.buf.write_spaces((level + 1) * self.indent)
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| 252 |
|
| 253 | def _BracketIndent(self, level):
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| 254 | # type: (int) -> None
|
| 255 |
|
| 256 | if self.indent == -1:
|
| 257 | return
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| 258 |
|
| 259 | self.buf.write_spaces(level * self.indent)
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| 260 |
|
| 261 | def _MaybeNewline(self):
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| 262 | # type: () -> None
|
| 263 | if self.indent == -1:
|
| 264 | return
|
| 265 | self.buf.write('\n')
|
| 266 |
|
| 267 | def _MaybeSpace(self):
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| 268 | # type: () -> None
|
| 269 | if self.indent == -1:
|
| 270 | return
|
| 271 | self.buf.write(' ')
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| 272 |
|
| 273 | def _PrintList(self, val, level):
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| 274 | # type: (value.List, int) -> None
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| 275 |
|
| 276 | if len(val.items) == 0: # Special case like Python/JS
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| 277 | self.buf.write('[]')
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| 278 | else:
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| 279 | self.buf.write('[')
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| 280 | self._MaybeNewline()
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| 281 | for i, item in enumerate(val.items):
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| 282 | if i != 0:
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| 283 | self.buf.write(',')
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| 284 | self._MaybeNewline()
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| 285 |
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| 286 | self._ItemIndent(level)
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| 287 | self.Print(item, level + 1)
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| 288 | self._MaybeNewline()
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| 289 |
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| 290 | self._BracketIndent(level)
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| 291 | self.buf.write(']')
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| 292 |
|
| 293 | def _PrintDict(self, val, level):
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| 294 | # type: (value.Dict, int) -> None
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| 295 |
|
| 296 | if len(val.d) == 0: # Special case like Python/JS
|
| 297 | self.buf.write('{}')
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| 298 | else:
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| 299 | self.buf.write('{')
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| 300 | self._MaybeNewline()
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| 301 | i = 0
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| 302 | for k, v in iteritems(val.d):
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| 303 | if i != 0:
|
| 304 | self.buf.write(',')
|
| 305 | self._MaybeNewline()
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| 306 |
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| 307 | self._ItemIndent(level)
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| 308 |
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| 309 | pyj8.WriteString(k, self.options, self.buf)
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| 310 |
|
| 311 | self.buf.write(':')
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| 312 | self._MaybeSpace()
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| 313 |
|
| 314 | self.Print(v, level + 1)
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| 315 |
|
| 316 | i += 1
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| 317 |
|
| 318 | self._MaybeNewline()
|
| 319 | self._BracketIndent(level)
|
| 320 | self.buf.write('}')
|
| 321 |
|
| 322 | def Print(self, val, level=0):
|
| 323 | # type: (value_t, int) -> None
|
| 324 |
|
| 325 | # special value that means everything is on one line
|
| 326 | # It's like
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| 327 | # JSON.stringify(d, null, 0)
|
| 328 | # except we use -1, not 0. 0 can still have newlines.
|
| 329 |
|
| 330 | UP_val = val
|
| 331 | with tagswitch(val) as case:
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| 332 | if case(value_e.Null):
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| 333 | self.buf.write('null')
|
| 334 |
|
| 335 | elif case(value_e.Bool):
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| 336 | val = cast(value.Bool, UP_val)
|
| 337 | self.buf.write('true' if val.b else 'false')
|
| 338 |
|
| 339 | elif case(value_e.Int):
|
| 340 | val = cast(value.Int, UP_val)
|
| 341 | # TODO: avoid intermediate allocation with
|
| 342 | # self.buf.WriteBigInt(val.i)
|
| 343 | #
|
| 344 | # Or maybe we need pyj8.WriteBigInt() because truly BigInt may
|
| 345 | # be of arbitrary length, and will need a growth strategy.
|
| 346 | # Although that is not very common, so we could allocate in
|
| 347 | # that case.
|
| 348 |
|
| 349 | self.buf.write(mops.ToStr(val.i))
|
| 350 |
|
| 351 | elif case(value_e.Float):
|
| 352 | val = cast(value.Float, UP_val)
|
| 353 |
|
| 354 | fl = val.f
|
| 355 | if ((self.options & INF_NAN_ARE_NULL) and
|
| 356 | (math.isnan(fl) or math.isinf(fl))):
|
| 357 | # JavaScript JSON lib behavior: Inf and NaN are null
|
| 358 | # Python has a bug in the encoder by default, and then
|
| 359 | # allow_nan=False raises an error
|
| 360 | s = 'null'
|
| 361 | else:
|
| 362 | # TODO: can we avoid intermediate allocation?
|
| 363 | # self.buf.WriteFloat(val.f)
|
| 364 | s = str(fl)
|
| 365 |
|
| 366 | self.buf.write(s)
|
| 367 |
|
| 368 | elif case(value_e.Str):
|
| 369 | val = cast(value.Str, UP_val)
|
| 370 |
|
| 371 | pyj8.WriteString(val.s, self.options, self.buf)
|
| 372 |
|
| 373 | elif case(value_e.List):
|
| 374 | val = cast(value.List, UP_val)
|
| 375 |
|
| 376 | # Cycle detection, only for containers that can be in cycles
|
| 377 | heap_id = HeapValueId(val)
|
| 378 |
|
| 379 | node_state = self.visited.get(heap_id, UNSEEN)
|
| 380 | if node_state == FINISHED:
|
| 381 | # Print it AGAIN. We print a JSON tree, which means we can
|
| 382 | # visit and print nodes MANY TIMES, as long as they're not
|
| 383 | # in a cycle.
|
| 384 | self._PrintList(val, level)
|
| 385 | return
|
| 386 | if node_state == EXPLORING:
|
| 387 | if self.options & SHOW_CYCLES:
|
| 388 | self.buf.write('[ -->%s ]' % ValueIdString(val))
|
| 389 | return
|
| 390 | else:
|
| 391 | # node.js prints which index closes the cycle
|
| 392 | raise error.Encode(
|
| 393 | "Can't encode List%s in object cycle" %
|
| 394 | ValueIdString(val))
|
| 395 |
|
| 396 | self.visited[heap_id] = EXPLORING
|
| 397 | self._PrintList(val, level)
|
| 398 | self.visited[heap_id] = FINISHED
|
| 399 |
|
| 400 | elif case(value_e.Dict):
|
| 401 | val = cast(value.Dict, UP_val)
|
| 402 |
|
| 403 | # Cycle detection, only for containers that can be in cycles
|
| 404 | heap_id = HeapValueId(val)
|
| 405 |
|
| 406 | node_state = self.visited.get(heap_id, UNSEEN)
|
| 407 | if node_state == FINISHED:
|
| 408 | # Print it AGAIN. We print a JSON tree, which means we can
|
| 409 | # visit and print nodes MANY TIMES, as long as they're not
|
| 410 | # in a cycle.
|
| 411 | self._PrintDict(val, level)
|
| 412 | return
|
| 413 | if node_state == EXPLORING:
|
| 414 | if self.options & SHOW_CYCLES:
|
| 415 | self.buf.write('{ -->%s }' % ValueIdString(val))
|
| 416 | return
|
| 417 | else:
|
| 418 | # node.js prints which key closes the cycle
|
| 419 | raise error.Encode(
|
| 420 | "Can't encode Dict%s in object cycle" %
|
| 421 | ValueIdString(val))
|
| 422 |
|
| 423 | self.visited[heap_id] = EXPLORING
|
| 424 | self._PrintDict(val, level)
|
| 425 | self.visited[heap_id] = FINISHED
|
| 426 |
|
| 427 | # BashArray and BashAssoc should be printed with pp line (x), e.g.
|
| 428 | # for spec tests.
|
| 429 | # - BashAssoc has a clear encoding.
|
| 430 | # - BashArray could eventually be Dict[int, str]. But that's not
|
| 431 | # encodable in JSON, which has string keys!
|
| 432 | # So I think we can print it like ["a",null,'b"] and that won't
|
| 433 | # change. That's what users expect.
|
| 434 | elif case(value_e.BashArray):
|
| 435 | val = cast(value.BashArray, UP_val)
|
| 436 |
|
| 437 | self.buf.write('[')
|
| 438 | self._MaybeNewline()
|
| 439 | for i, s in enumerate(val.strs):
|
| 440 | if i != 0:
|
| 441 | self.buf.write(',')
|
| 442 | self._MaybeNewline()
|
| 443 |
|
| 444 | self._ItemIndent(level)
|
| 445 | if s is None:
|
| 446 | self.buf.write('null')
|
| 447 | else:
|
| 448 | pyj8.WriteString(s, self.options, self.buf)
|
| 449 |
|
| 450 | self._MaybeNewline()
|
| 451 |
|
| 452 | self._BracketIndent(level)
|
| 453 | self.buf.write(']')
|
| 454 |
|
| 455 | elif case(value_e.BashAssoc):
|
| 456 | val = cast(value.BashAssoc, UP_val)
|
| 457 |
|
| 458 | self.buf.write('{')
|
| 459 | self._MaybeNewline()
|
| 460 | i = 0
|
| 461 | for k2, v2 in iteritems(val.d):
|
| 462 | if i != 0:
|
| 463 | self.buf.write(',')
|
| 464 | self._MaybeNewline()
|
| 465 |
|
| 466 | self._ItemIndent(level)
|
| 467 |
|
| 468 | pyj8.WriteString(k2, self.options, self.buf)
|
| 469 |
|
| 470 | self.buf.write(':')
|
| 471 | self._MaybeSpace()
|
| 472 |
|
| 473 | pyj8.WriteString(v2, self.options, self.buf)
|
| 474 |
|
| 475 | i += 1
|
| 476 |
|
| 477 | self._MaybeNewline()
|
| 478 | self._BracketIndent(level)
|
| 479 | self.buf.write('}')
|
| 480 |
|
| 481 | else:
|
| 482 | pass # mycpp workaround
|
| 483 | if self.options & SHOW_NON_DATA:
|
| 484 | # Similar to = operator, ui.DebugPrint()
|
| 485 | # TODO: that prints value.Range in a special way
|
| 486 | ysh_type = ValType(val)
|
| 487 | id_str = ValueIdString(val)
|
| 488 | self.buf.write('<%s%s>' % (ysh_type, id_str))
|
| 489 | else:
|
| 490 | raise error.Encode("Can't serialize object of type %s" %
|
| 491 | ValType(val))
|
| 492 |
|
| 493 |
|
| 494 | class PrettyPrinter(object):
|
| 495 | """ Unused right now, but could enhance the = operator.
|
| 496 |
|
| 497 | Output to polymorphic ColorOutput
|
| 498 |
|
| 499 | Features like asdl/format.py:
|
| 500 | - line wrapping
|
| 501 | - color
|
| 502 | - sharing detection by passing in a REF COUTN dict
|
| 503 | - print @123 the first time, and then print ... the second time
|
| 504 |
|
| 505 | and
|
| 506 |
|
| 507 | - Pretty spaces: {"k": "v", "k2": "v2"} instead of {"k":"v","k2","v2"}
|
| 508 | - Unquoted: {k: "v", k2: "v2"} instead of {"k": "v", "k2": "v2"}
|
| 509 |
|
| 510 | - Omitting commas for ASDL? Maybe we can use two spaces
|
| 511 |
|
| 512 | (Token id: Id.VSub_DollarName start: 0 length: 3)
|
| 513 | (Token id:Id.VSub_DollarName start:0 length:3) - color makes this work
|
| 514 | """
|
| 515 |
|
| 516 | def __init__(self, max_col):
|
| 517 | # type: (int) -> None
|
| 518 | self.max_col = max_col
|
| 519 |
|
| 520 | # This could be an optimized set an C++ bit set like
|
| 521 | # mark_sweep_heap.h, rather than a Dict
|
| 522 | #self.unique_objs = mylib.UniqueObjects()
|
| 523 |
|
| 524 | # first pass of object ID -> number of times references
|
| 525 |
|
| 526 | self.ref_count = {} # type: Dict[int, int]
|
| 527 |
|
| 528 | def PrettyTree(self, val, f):
|
| 529 | # type: (value_t, fmt.ColorOutput) -> None
|
| 530 |
|
| 531 | # TODO: first convert to hnode.asdl types?
|
| 532 |
|
| 533 | # Although we might want
|
| 534 | # hnode.AlreadyShown = (str type, int unique_id)
|
| 535 | pass
|
| 536 |
|
| 537 | def Print(self, val, buf):
|
| 538 | # type: (value_t, mylib.BufWriter) -> None
|
| 539 |
|
| 540 | # Or print to stderr?
|
| 541 | f = fmt.DetectConsoleOutput(mylib.Stdout())
|
| 542 | self.PrettyTree(val, f)
|
| 543 |
|
| 544 | # Then print those with ASDL
|
| 545 | pass
|
| 546 |
|
| 547 |
|
| 548 | class LexerDecoder(object):
|
| 549 | """J8 lexer and string decoder.
|
| 550 |
|
| 551 | Similar interface as SimpleLexer, except we return an optional decoded
|
| 552 | string
|
| 553 | """
|
| 554 |
|
| 555 | def __init__(self, s, is_j8, lang_str):
|
| 556 | # type: (str, bool, str) -> None
|
| 557 | self.s = s
|
| 558 | self.is_j8 = is_j8
|
| 559 | self.lang_str = lang_str
|
| 560 |
|
| 561 | self.pos = 0
|
| 562 |
|
| 563 | # current line being lexed -- for error messages
|
| 564 | self.cur_line_num = 1
|
| 565 |
|
| 566 | # Reuse this instance to save GC objects. JSON objects could have
|
| 567 | # thousands of strings.
|
| 568 | self.decoded = mylib.BufWriter()
|
| 569 |
|
| 570 | def _Error(self, msg, end_pos):
|
| 571 | # type: (str, int) -> error.Decode
|
| 572 |
|
| 573 | # Use the current position as start pos
|
| 574 | return error.Decode(msg, self.s, self.pos, end_pos, self.cur_line_num)
|
| 575 |
|
| 576 | def Next(self):
|
| 577 | # type: () -> Tuple[Id_t, int, Optional[str]]
|
| 578 | """ Returns a token and updates self.pos """
|
| 579 |
|
| 580 | tok_id, end_pos = match.MatchJ8Token(self.s, self.pos)
|
| 581 |
|
| 582 | if not self.is_j8:
|
| 583 | if tok_id in (Id.Left_BSingleQuote, Id.Left_USingleQuote):
|
| 584 | raise self._Error(
|
| 585 | "Single quotes aren't part of JSON; you may want 'json8 read'",
|
| 586 | end_pos)
|
| 587 | if tok_id == Id.Ignored_Comment:
|
| 588 | raise self._Error(
|
| 589 | "Comments aren't part of JSON; you may want 'json8 read'",
|
| 590 | end_pos)
|
| 591 |
|
| 592 | if tok_id in (Id.Left_DoubleQuote, Id.Left_BSingleQuote,
|
| 593 | Id.Left_USingleQuote):
|
| 594 | return self._DecodeString(tok_id, end_pos)
|
| 595 |
|
| 596 | if tok_id == Id.Left_JDoubleQuote:
|
| 597 | if self.is_j8:
|
| 598 | return self._DecodeString(tok_id, end_pos)
|
| 599 | else:
|
| 600 | raise self._Error('Pure JSON does not accept j"" prefix',
|
| 601 | end_pos)
|
| 602 |
|
| 603 | if tok_id == Id.Ignored_Newline:
|
| 604 | #log('LINE %d', self.cur_line_num)
|
| 605 | self.cur_line_num += 1
|
| 606 |
|
| 607 | self.pos = end_pos
|
| 608 | return tok_id, end_pos, None
|
| 609 |
|
| 610 | def NextForLines(self):
|
| 611 | # type: () -> Tuple[Id_t, int, Optional[str]]
|
| 612 | """ Like Next(), but for J8 Lines """
|
| 613 |
|
| 614 | tok_id, end_pos = match.MatchJ8LinesToken(self.s, self.pos)
|
| 615 |
|
| 616 | if tok_id in (Id.Left_DoubleQuote, Id.Left_JDoubleQuote,
|
| 617 | Id.Left_BSingleQuote, Id.Left_USingleQuote):
|
| 618 | return self._DecodeString(tok_id, end_pos)
|
| 619 |
|
| 620 | # Check that UNQUOTED lines are valid UTF-8. (_DecodeString() does
|
| 621 | # this for quoted strings.)
|
| 622 | if (tok_id == Id.Lit_Chars and
|
| 623 | not pyj8.PartIsUtf8(self.s, self.pos, end_pos)):
|
| 624 | raise self._Error(
|
| 625 | 'Invalid UTF-8 in %s string literal' % self.lang_str, end_pos)
|
| 626 | if tok_id == Id.Char_AsciiControl:
|
| 627 | raise self._Error(
|
| 628 | "J8 Lines can't have unescaped ASCII control chars", end_pos)
|
| 629 |
|
| 630 | if tok_id == Id.J8_Newline:
|
| 631 | #log('LINE %d', self.cur_line_num)
|
| 632 | self.cur_line_num += 1
|
| 633 |
|
| 634 | self.pos = end_pos
|
| 635 | return tok_id, end_pos, None
|
| 636 |
|
| 637 | def _DecodeString(self, left_id, str_pos):
|
| 638 | # type: (Id_t, int) -> Tuple[Id_t, int, Optional[str]]
|
| 639 | """ Returns a string token and updates self.pos """
|
| 640 |
|
| 641 | while True:
|
| 642 | if left_id in (Id.Left_DoubleQuote, Id.Left_JDoubleQuote):
|
| 643 | tok_id, str_end = match.MatchJsonStrToken(self.s, str_pos)
|
| 644 | else:
|
| 645 | tok_id, str_end = match.MatchJ8StrToken(self.s, str_pos)
|
| 646 |
|
| 647 | #log('String tok %s %r', Id_str(tok_id), self.s[str_pos:str_end])
|
| 648 |
|
| 649 | if tok_id == Id.Eol_Tok:
|
| 650 | # TODO: point to beginning of # quote?
|
| 651 | raise self._Error(
|
| 652 | 'Unexpected EOF while lexing %s string' % self.lang_str,
|
| 653 | str_end)
|
| 654 | if tok_id == Id.Unknown_Backslash:
|
| 655 | raise self._Error(
|
| 656 | 'Bad backslash escape in %s string' % self.lang_str,
|
| 657 | str_end)
|
| 658 | if tok_id == Id.Char_AsciiControl:
|
| 659 | raise self._Error(
|
| 660 | "%s strings can't have unescaped ASCII control chars" %
|
| 661 | self.lang_str, str_end)
|
| 662 |
|
| 663 | if tok_id in (Id.Right_SingleQuote, Id.Right_DoubleQuote):
|
| 664 |
|
| 665 | self.pos = str_end
|
| 666 |
|
| 667 | s = self.decoded.getvalue()
|
| 668 | self.decoded.clear() # reuse this instance
|
| 669 |
|
| 670 | #log('decoded %r', self.decoded.getvalue())
|
| 671 | return Id.J8_String, str_end, s
|
| 672 |
|
| 673 | #
|
| 674 | # Now handle each kind of token
|
| 675 | #
|
| 676 |
|
| 677 | if tok_id == Id.Lit_Chars: # JSON and J8
|
| 678 | part = self.s[str_pos:str_end]
|
| 679 | if not pyj8.PartIsUtf8(self.s, str_pos, str_end):
|
| 680 | raise self._Error(
|
| 681 | 'Invalid UTF-8 in %s string literal' % self.lang_str,
|
| 682 | str_end)
|
| 683 |
|
| 684 | # TODO: would be nice to avoid allocation in all these cases.
|
| 685 | # But LookupCharC() would have to change.
|
| 686 |
|
| 687 | elif tok_id == Id.Char_OneChar: # JSON and J8
|
| 688 | ch = self.s[str_pos + 1]
|
| 689 | part = consts.LookupCharC(ch)
|
| 690 |
|
| 691 | elif tok_id == Id.Char_UBraced: # J8 only
|
| 692 | h = self.s[str_pos + 3:str_end - 1]
|
| 693 | i = int(h, 16)
|
| 694 |
|
| 695 | # Same checks in osh/word_compile.py
|
| 696 | if i > 0x10ffff:
|
| 697 | raise self._Error(
|
| 698 | "Code point can't be greater than U+10ffff", str_end)
|
| 699 | if 0xD800 <= i and i < 0xE000:
|
| 700 | raise self._Error(
|
| 701 | r"\u{%s} escape is illegal because it's in the surrogate range"
|
| 702 | % h, str_end)
|
| 703 |
|
| 704 | part = Utf8Encode(i)
|
| 705 |
|
| 706 | elif tok_id == Id.Char_YHex: # J8 only
|
| 707 | h = self.s[str_pos + 2:str_end]
|
| 708 |
|
| 709 | # Same check in osh/word_parse.py
|
| 710 | if left_id != Id.Left_BSingleQuote:
|
| 711 | assert left_id != Id.Left_BTSingleQuote, "Not handled here"
|
| 712 | raise self._Error(
|
| 713 | r"\y%s escapes not allowed in u'' strings" % h,
|
| 714 | str_end)
|
| 715 |
|
| 716 | i = int(h, 16)
|
| 717 | part = chr(i)
|
| 718 |
|
| 719 | elif tok_id == Id.Char_SurrogatePair:
|
| 720 | h1 = self.s[str_pos + 2:str_pos + 6]
|
| 721 | h2 = self.s[str_pos + 8:str_pos + 12]
|
| 722 |
|
| 723 | # https://www.oilshell.org/blog/2023/06/surrogate-pair.html
|
| 724 | i1 = int(h1, 16) - 0xD800 # high surrogate
|
| 725 | i2 = int(h2, 16) - 0xDC00 # low surrogate
|
| 726 | code_point = 0x10000 + (i1 << 10) + i2
|
| 727 |
|
| 728 | part = Utf8Encode(code_point)
|
| 729 |
|
| 730 | elif tok_id == Id.Char_Unicode4: # JSON only, unpaired
|
| 731 | h = self.s[str_pos + 2:str_end]
|
| 732 | i = int(h, 16)
|
| 733 | part = Utf8Encode(i)
|
| 734 |
|
| 735 | else:
|
| 736 | # Should never happen
|
| 737 | raise AssertionError(Id_str(tok_id))
|
| 738 |
|
| 739 | #log('%s part %r', Id_str(tok_id), part)
|
| 740 | self.decoded.write(part)
|
| 741 | str_pos = str_end
|
| 742 |
|
| 743 |
|
| 744 | class _Parser(object):
|
| 745 |
|
| 746 | def __init__(self, s, is_j8):
|
| 747 | # type: (str, bool) -> None
|
| 748 | self.s = s
|
| 749 | self.is_j8 = is_j8
|
| 750 | self.lang_str = "J8" if is_j8 else "JSON"
|
| 751 |
|
| 752 | self.lexer = LexerDecoder(s, is_j8, self.lang_str)
|
| 753 | self.tok_id = Id.Undefined_Tok
|
| 754 | self.start_pos = 0
|
| 755 | self.end_pos = 0
|
| 756 | self.decoded = '' # decoded J8 string
|
| 757 |
|
| 758 | def _Next(self):
|
| 759 | # type: () -> None
|
| 760 |
|
| 761 | # This isn't the start of a J8_Bool token, it's the END of the token before it
|
| 762 | while True:
|
| 763 | self.start_pos = self.end_pos
|
| 764 | self.tok_id, self.end_pos, self.decoded = self.lexer.Next()
|
| 765 | if self.tok_id not in (Id.Ignored_Space, Id.Ignored_Newline,
|
| 766 | Id.Ignored_Comment):
|
| 767 | break
|
| 768 | # TODO: add Ignored_Newline to count lines, and show line numbers
|
| 769 | # in errors messages. The position of the last newline and a token
|
| 770 | # can be used to calculate a column number.
|
| 771 |
|
| 772 | #log('NEXT %s %s %s %s', Id_str(self.tok_id), self.start_pos, self.end_pos, self.decoded or '-')
|
| 773 |
|
| 774 | def _Eat(self, tok_id):
|
| 775 | # type: (Id_t) -> None
|
| 776 |
|
| 777 | if self.tok_id != tok_id:
|
| 778 | #log('position %r %d-%d %r', self.s, self.start_pos,
|
| 779 | # self.end_pos, self.s[self.start_pos:self.end_pos])
|
| 780 | raise self._ParseError("Expected %s, got %s" %
|
| 781 | (Id_str(tok_id), Id_str(self.tok_id)))
|
| 782 | self._Next()
|
| 783 |
|
| 784 | def _NextForLines(self):
|
| 785 | # type: () -> None
|
| 786 | """Like _Next, but use the J8 Lines lexer."""
|
| 787 | self.start_pos = self.end_pos
|
| 788 | self.tok_id, self.end_pos, self.decoded = self.lexer.NextForLines()
|
| 789 |
|
| 790 | def _ParseError(self, msg):
|
| 791 | # type: (str) -> error.Decode
|
| 792 | return error.Decode(msg, self.s, self.start_pos, self.end_pos,
|
| 793 | self.lexer.cur_line_num)
|
| 794 |
|
| 795 |
|
| 796 | class Parser(_Parser):
|
| 797 | """JSON and JSON8 Parser."""
|
| 798 |
|
| 799 | def __init__(self, s, is_j8):
|
| 800 | # type: (str, bool) -> None
|
| 801 | _Parser.__init__(self, s, is_j8)
|
| 802 |
|
| 803 | def _ParsePair(self):
|
| 804 | # type: () -> Tuple[str, value_t]
|
| 805 |
|
| 806 | k = self.decoded # Save the potential string value
|
| 807 | self._Eat(Id.J8_String) # Check that it's a string
|
| 808 | assert k is not None
|
| 809 |
|
| 810 | self._Eat(Id.J8_Colon)
|
| 811 |
|
| 812 | v = self._ParseValue()
|
| 813 | return k, v
|
| 814 |
|
| 815 | def _ParseDict(self):
|
| 816 | # type: () -> value_t
|
| 817 | """
|
| 818 | pair = string ':' value
|
| 819 | Dict = '{' '}'
|
| 820 | | '{' pair (',' pair)* '}'
|
| 821 | """
|
| 822 | # precondition
|
| 823 | assert self.tok_id == Id.J8_LBrace, Id_str(self.tok_id)
|
| 824 |
|
| 825 | #log('> Dict')
|
| 826 |
|
| 827 | d = NewDict() # type: Dict[str, value_t]
|
| 828 |
|
| 829 | self._Next()
|
| 830 | if self.tok_id == Id.J8_RBrace:
|
| 831 | self._Next()
|
| 832 | return value.Dict(d)
|
| 833 |
|
| 834 | k, v = self._ParsePair()
|
| 835 | d[k] = v
|
| 836 | #log(' [1] k %s v %s Id %s', k, v, Id_str(self.tok_id))
|
| 837 |
|
| 838 | while self.tok_id == Id.J8_Comma:
|
| 839 | self._Next()
|
| 840 | k, v = self._ParsePair()
|
| 841 | d[k] = v
|
| 842 | #log(' [2] k %s v %s Id %s', k, v, Id_str(self.tok_id))
|
| 843 |
|
| 844 | self._Eat(Id.J8_RBrace)
|
| 845 |
|
| 846 | #log('< Dict')
|
| 847 |
|
| 848 | return value.Dict(d)
|
| 849 |
|
| 850 | def _ParseList(self):
|
| 851 | # type: () -> value_t
|
| 852 | """
|
| 853 | List = '[' ']'
|
| 854 | | '[' value (',' value)* ']'
|
| 855 | """
|
| 856 | assert self.tok_id == Id.J8_LBracket, Id_str(self.tok_id)
|
| 857 |
|
| 858 | items = [] # type: List[value_t]
|
| 859 |
|
| 860 | self._Next()
|
| 861 | if self.tok_id == Id.J8_RBracket:
|
| 862 | self._Next()
|
| 863 | return value.List(items)
|
| 864 |
|
| 865 | items.append(self._ParseValue())
|
| 866 |
|
| 867 | while self.tok_id == Id.J8_Comma:
|
| 868 | self._Next()
|
| 869 | items.append(self._ParseValue())
|
| 870 |
|
| 871 | self._Eat(Id.J8_RBracket)
|
| 872 |
|
| 873 | return value.List(items)
|
| 874 |
|
| 875 | def _ParseValue(self):
|
| 876 | # type: () -> value_t
|
| 877 | if self.tok_id == Id.J8_LBrace:
|
| 878 | return self._ParseDict()
|
| 879 |
|
| 880 | elif self.tok_id == Id.J8_LBracket:
|
| 881 | return self._ParseList()
|
| 882 |
|
| 883 | elif self.tok_id == Id.J8_Null:
|
| 884 | self._Next()
|
| 885 | return value.Null
|
| 886 |
|
| 887 | elif self.tok_id == Id.J8_Bool:
|
| 888 | #log('%r %d', self.s[self.start_pos], self.start_pos)
|
| 889 | b = value.Bool(self.s[self.start_pos] == 't')
|
| 890 | self._Next()
|
| 891 | return b
|
| 892 |
|
| 893 | elif self.tok_id == Id.J8_Int:
|
| 894 | part = self.s[self.start_pos:self.end_pos]
|
| 895 | self._Next()
|
| 896 | try:
|
| 897 | big = mops.FromStr(part)
|
| 898 | except ValueError:
|
| 899 | raise self._ParseError('Integer is too big')
|
| 900 | return value.Int(big)
|
| 901 |
|
| 902 | elif self.tok_id == Id.J8_Float:
|
| 903 | part = self.s[self.start_pos:self.end_pos]
|
| 904 | self._Next()
|
| 905 | return value.Float(float(part))
|
| 906 |
|
| 907 | # UString, BString too
|
| 908 | elif self.tok_id == Id.J8_String:
|
| 909 | str_val = value.Str(self.decoded)
|
| 910 | #log('d %r', self.decoded)
|
| 911 | self._Next()
|
| 912 | return str_val
|
| 913 |
|
| 914 | elif self.tok_id == Id.Eol_Tok:
|
| 915 | raise self._ParseError('Unexpected EOF while parsing %s' %
|
| 916 | self.lang_str)
|
| 917 |
|
| 918 | else: # Id.Unknown_Tok, Id.J8_{LParen,RParen}
|
| 919 | raise self._ParseError('Invalid token while parsing %s: %s' %
|
| 920 | (self.lang_str, Id_str(self.tok_id)))
|
| 921 |
|
| 922 | def ParseValue(self):
|
| 923 | # type: () -> value_t
|
| 924 | """ Raises error.Decode. """
|
| 925 | self._Next()
|
| 926 | obj = self._ParseValue()
|
| 927 |
|
| 928 | n = len(self.s)
|
| 929 | if self.start_pos != n:
|
| 930 | extra = n - self.start_pos
|
| 931 | #log('n %d pos %d', n, self.start_pos)
|
| 932 | raise self._ParseError(
|
| 933 | 'Got %d bytes of unexpected trailing input' % extra)
|
| 934 | return obj
|
| 935 |
|
| 936 |
|
| 937 | class Nil8Parser(_Parser):
|
| 938 | """
|
| 939 | Tokens not in JSON8:
|
| 940 | LParen RParen Symbol
|
| 941 |
|
| 942 | Tokens not in JSON, but in JSON8 and NIL8:
|
| 943 | Identifier (unquoted keys)
|
| 944 | Ignored_Comment
|
| 945 | """
|
| 946 |
|
| 947 | def __init__(self, s, is_j8):
|
| 948 | # type: (str, bool) -> None
|
| 949 | _Parser.__init__(self, s, is_j8)
|
| 950 |
|
| 951 | if 0:
|
| 952 |
|
| 953 | def _LookAhead(self):
|
| 954 | # type: () -> Id_t
|
| 955 | """
|
| 956 | Don't need this right now
|
| 957 | """
|
| 958 | end_pos = self.end_pos # look ahead from last token
|
| 959 | while True:
|
| 960 | tok_id, end_pos = match.MatchJ8Token(self.s, end_pos)
|
| 961 | if tok_id not in (Id.Ignored_Space, Id.Ignored_Newline,
|
| 962 | Id.Ignored_Comment):
|
| 963 | break
|
| 964 | return tok_id
|
| 965 |
|
| 966 | def _ParseRecord(self):
|
| 967 | # type: () -> nvalue_t
|
| 968 | """
|
| 969 | Yaks
|
| 970 | (self->Next) => (-> self Next)
|
| 971 | (self->Next obj.field) => ((-> self Next) (. obj field))
|
| 972 |
|
| 973 | Similar to
|
| 974 | ((identity identity) 42) => 42 in Clojure
|
| 975 |
|
| 976 | ASDL
|
| 977 | (Node left:(. x4beef2))
|
| 978 | (Node left !x4beef2)
|
| 979 |
|
| 980 | # Ambiguous because value can be identifier.
|
| 981 | # We have to look ahead to and see if there's a colon :
|
| 982 | field =
|
| 983 | Identifier ':' value
|
| 984 | | value
|
| 985 |
|
| 986 | record = '(' head field* ')'
|
| 987 |
|
| 988 | - Identifier | Symbol are treated the same, it's a side effect of
|
| 989 | the lexing style
|
| 990 | - do positional args come before named args
|
| 991 | - () is invalid? Use [] for empty list
|
| 992 | """
|
| 993 | assert self.tok_id == Id.J8_LParen, Id_str(self.tok_id)
|
| 994 |
|
| 995 | items = [] # type: List[nvalue_t]
|
| 996 |
|
| 997 | self._Next()
|
| 998 | if self.tok_id == Id.J8_RParen:
|
| 999 | self._Next()
|
| 1000 | return nvalue.List(items)
|
| 1001 |
|
| 1002 | #log('TOK %s', Id_str(self.tok_id))
|
| 1003 | while self.tok_id != Id.J8_RParen:
|
| 1004 | items.append(self._ParseNil8())
|
| 1005 | #log('TOK 2 %s', Id_str(self.tok_id))
|
| 1006 |
|
| 1007 | self._Eat(Id.J8_RParen)
|
| 1008 |
|
| 1009 | return nvalue.List(items)
|
| 1010 |
|
| 1011 | def _ParseList8(self):
|
| 1012 | # type: () -> nvalue_t
|
| 1013 | """
|
| 1014 | List8 = '[' value* ']'
|
| 1015 |
|
| 1016 | No commas, not even optional ones for now.
|
| 1017 | """
|
| 1018 | assert self.tok_id == Id.J8_LBracket, Id_str(self.tok_id)
|
| 1019 |
|
| 1020 | items = [] # type: List[nvalue_t]
|
| 1021 |
|
| 1022 | self._Next()
|
| 1023 | if self.tok_id == Id.J8_RBracket:
|
| 1024 | self._Next()
|
| 1025 | return nvalue.List(items)
|
| 1026 |
|
| 1027 | #log('TOK %s', Id_str(self.tok_id))
|
| 1028 | while self.tok_id != Id.J8_RBracket:
|
| 1029 | items.append(self._ParseNil8())
|
| 1030 | #log('TOK 2 %s', Id_str(self.tok_id))
|
| 1031 |
|
| 1032 | self._Eat(Id.J8_RBracket)
|
| 1033 |
|
| 1034 | return nvalue.List(items)
|
| 1035 |
|
| 1036 | def _ParseNil8(self):
|
| 1037 | # type: () -> nvalue_t
|
| 1038 | if self.tok_id == Id.J8_LParen:
|
| 1039 | obj = self._ParseRecord() # type: nvalue_t
|
| 1040 | #return obj
|
| 1041 |
|
| 1042 | elif self.tok_id == Id.J8_LBracket:
|
| 1043 | obj = self._ParseList8()
|
| 1044 | #return obj
|
| 1045 |
|
| 1046 | # Primitives are copied from J8 above.
|
| 1047 | # TODO: We also want hex literals.
|
| 1048 | elif self.tok_id == Id.J8_Null:
|
| 1049 | self._Next()
|
| 1050 | obj = nvalue.Null
|
| 1051 |
|
| 1052 | elif self.tok_id == Id.J8_Bool:
|
| 1053 | b = nvalue.Bool(self.s[self.start_pos] == 't')
|
| 1054 | self._Next()
|
| 1055 | obj = b
|
| 1056 |
|
| 1057 | elif self.tok_id == Id.J8_Int:
|
| 1058 | part = self.s[self.start_pos:self.end_pos]
|
| 1059 | self._Next()
|
| 1060 | obj = nvalue.Int(int(part))
|
| 1061 |
|
| 1062 | elif self.tok_id == Id.J8_Float:
|
| 1063 | part = self.s[self.start_pos:self.end_pos]
|
| 1064 | self._Next()
|
| 1065 | obj = nvalue.Float(float(part))
|
| 1066 |
|
| 1067 | elif self.tok_id == Id.J8_String:
|
| 1068 | str_val = nvalue.Str(self.decoded)
|
| 1069 | self._Next()
|
| 1070 | obj = str_val
|
| 1071 |
|
| 1072 | # <- etc.
|
| 1073 | elif self.tok_id in (Id.J8_Identifier, Id.J8_Operator, Id.J8_Colon,
|
| 1074 | Id.J8_Comma):
|
| 1075 | # unquoted "word" treated like a string
|
| 1076 | part = self.s[self.start_pos:self.end_pos]
|
| 1077 | self._Next()
|
| 1078 | obj = nvalue.Symbol(part)
|
| 1079 |
|
| 1080 | elif self.tok_id == Id.Eol_Tok:
|
| 1081 | raise self._ParseError('Unexpected EOF while parsing %s' %
|
| 1082 | self.lang_str)
|
| 1083 |
|
| 1084 | else: # Id.Unknown_Tok, Id.J8_{LParen,RParen}
|
| 1085 | raise self._ParseError('Invalid token while parsing %s: %s' %
|
| 1086 | (self.lang_str, Id_str(self.tok_id)))
|
| 1087 |
|
| 1088 | #log('YO %s', Id_str(self.tok_id))
|
| 1089 | if self.tok_id in (Id.J8_Operator, Id.J8_Colon, Id.J8_Comma):
|
| 1090 | #log('AT %s', Id_str(self.tok_id))
|
| 1091 |
|
| 1092 | # key: "value" -> (: key "value")
|
| 1093 | part = self.s[self.start_pos:self.end_pos]
|
| 1094 | op = nvalue.Symbol(part)
|
| 1095 |
|
| 1096 | self._Next()
|
| 1097 | operand2 = self._ParseNil8()
|
| 1098 | infix = nvalue.List([op, obj, operand2]) # type: nvalue_t
|
| 1099 | #print("--> INFIX %d %s" % (id(infix), infix))
|
| 1100 | return infix
|
| 1101 |
|
| 1102 | #next_id = self._LookAhead()
|
| 1103 | #print('NEXT %s' % Id_str(next_id))
|
| 1104 |
|
| 1105 | #raise AssertionError()
|
| 1106 | #print("--> OBJ %d %s" % (id(obj), obj))
|
| 1107 | return obj
|
| 1108 |
|
| 1109 | def ParseNil8(self):
|
| 1110 | # type: () -> nvalue_t
|
| 1111 | """ Raises error.Decode. """
|
| 1112 | self._Next()
|
| 1113 | #print('yo')
|
| 1114 | obj = self._ParseNil8()
|
| 1115 | #print("==> %d %s" % (id(obj), obj))
|
| 1116 | if self.tok_id != Id.Eol_Tok:
|
| 1117 | raise self._ParseError('Unexpected trailing input')
|
| 1118 | return obj
|
| 1119 |
|
| 1120 |
|
| 1121 | class J8LinesParser(_Parser):
|
| 1122 | """Decode lines from a string with newlines.
|
| 1123 |
|
| 1124 | We specify this with a grammar, to preserve location info and to reduce
|
| 1125 | allocations. (But note that unquoted_line is more like a LOOP than it is
|
| 1126 | grammatical.)
|
| 1127 |
|
| 1128 | Grammar:
|
| 1129 |
|
| 1130 | end = J8_Newline | Eol_Tok
|
| 1131 |
|
| 1132 | empty_line = WS_Space? end
|
| 1133 |
|
| 1134 | # special case: read until end token, but REMOVE trailing WS_Space
|
| 1135 | unquoted_line = WS_Space? Lit_Chars ANY* WS_Space? end
|
| 1136 |
|
| 1137 | j8_line = WS_Space? J8_String WS_Space? end
|
| 1138 |
|
| 1139 | lines = (empty_line | unquoted_line | j8_line)*
|
| 1140 |
|
| 1141 | where Lit_Chars is valid UTF-8
|
| 1142 |
|
| 1143 | Notes:
|
| 1144 |
|
| 1145 | (1) We disallow multiple strings on a line, like:
|
| 1146 |
|
| 1147 | "json" "json2"
|
| 1148 | "json" unquoted
|
| 1149 |
|
| 1150 | (2) Internal quotes are allowed on unquoted lines. Consider this line:
|
| 1151 |
|
| 1152 | foo "" u''
|
| 1153 |
|
| 1154 | The "" and u'' are not a decoded string, because the line started with
|
| 1155 | Id.Lit_Chars literals.
|
| 1156 |
|
| 1157 | (3) This is related to TSV8? Similar rules. Does TSV8 have empty cells?
|
| 1158 | Does it have - for empty cell?
|
| 1159 | """
|
| 1160 |
|
| 1161 | def __init__(self, s):
|
| 1162 | # type: (str) -> None
|
| 1163 | _Parser.__init__(self, s, True)
|
| 1164 |
|
| 1165 | def _Show(self, s):
|
| 1166 | # type: (str) -> None
|
| 1167 | log('%s tok_id %s %d-%d', s, Id_str(self.tok_id), self.start_pos,
|
| 1168 | self.end_pos)
|
| 1169 |
|
| 1170 | def _ParseLine(self, out):
|
| 1171 | # type: (List[str]) -> None
|
| 1172 | """ May append a line to 'out' """
|
| 1173 | #self._Show('1')
|
| 1174 | if self.tok_id == Id.WS_Space:
|
| 1175 | self._NextForLines()
|
| 1176 |
|
| 1177 | # Empty line - return without doing anything
|
| 1178 | if self.tok_id in (Id.J8_Newline, Id.Eol_Tok):
|
| 1179 | self._NextForLines()
|
| 1180 | return
|
| 1181 |
|
| 1182 | # Quoted string on line
|
| 1183 | if self.tok_id == Id.J8_String:
|
| 1184 | out.append(self.decoded)
|
| 1185 | self._NextForLines()
|
| 1186 |
|
| 1187 | if self.tok_id == Id.WS_Space: # trailing whitespace
|
| 1188 | self._NextForLines()
|
| 1189 |
|
| 1190 | if self.tok_id not in (Id.J8_Newline, Id.Eol_Tok):
|
| 1191 | raise self._ParseError('Unexpected text after J8 Line (%s)' %
|
| 1192 | Id_str(self.tok_id))
|
| 1193 |
|
| 1194 | self._NextForLines()
|
| 1195 | return
|
| 1196 |
|
| 1197 | # Unquoted line
|
| 1198 | if self.tok_id == Id.Lit_Chars:
|
| 1199 | # ' unquoted "" text on line ' # read every token until end
|
| 1200 | string_start = self.start_pos
|
| 1201 | while True:
|
| 1202 | # for stripping whitespace
|
| 1203 | prev_id = self.tok_id
|
| 1204 | prev_start = self.start_pos
|
| 1205 |
|
| 1206 | self._NextForLines()
|
| 1207 |
|
| 1208 | # It would be nicer if "middle" Id.WS_Space tokens didn't have
|
| 1209 | # \r, but we're sticking with the JSON spec definition of
|
| 1210 | # whitespace. (As another data point, CPython on Unix allows
|
| 1211 | # \r in the middle of expressions, treating it as whitespace.)
|
| 1212 | if self.tok_id in (Id.J8_Newline, Id.Eol_Tok):
|
| 1213 | break
|
| 1214 |
|
| 1215 | if prev_id == Id.WS_Space:
|
| 1216 | string_end = prev_start # remove trailing whitespace
|
| 1217 | else:
|
| 1218 | string_end = self.start_pos
|
| 1219 |
|
| 1220 | out.append(self.s[string_start:string_end])
|
| 1221 |
|
| 1222 | self._NextForLines() # past newline
|
| 1223 | return
|
| 1224 |
|
| 1225 | raise AssertionError(Id_str(self.tok_id))
|
| 1226 |
|
| 1227 | def Parse(self):
|
| 1228 | # type: () -> List[str]
|
| 1229 | """ Raises error.Decode. """
|
| 1230 | self._NextForLines()
|
| 1231 |
|
| 1232 | lines = [] # type: List[str]
|
| 1233 | while self.tok_id != Id.Eol_Tok:
|
| 1234 | self._ParseLine(lines)
|
| 1235 |
|
| 1236 | if self.tok_id != Id.Eol_Tok:
|
| 1237 | raise self._ParseError('Unexpected trailing input in J8 Lines')
|
| 1238 |
|
| 1239 | return lines
|
| 1240 |
|
| 1241 |
|
| 1242 | def SplitJ8Lines(s):
|
| 1243 | # type: (str) -> List[str]
|
| 1244 | """Used by @(echo split command sub)
|
| 1245 |
|
| 1246 | Raises:
|
| 1247 | error.Decode
|
| 1248 |
|
| 1249 | 3 Errors:
|
| 1250 | - J8 string syntax error inside quotes
|
| 1251 | - Extra input on line
|
| 1252 | - unquoted line isn't utf-8
|
| 1253 | """
|
| 1254 | p = J8LinesParser(s)
|
| 1255 | return p.Parse()
|
| 1256 |
|
| 1257 |
|
| 1258 | # vim: sw=4
|