1 | #!/usr/bin/env python2
|
2 | """
|
3 | j8.py: J8 Notation, a superset of JSON
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4 |
|
5 | Later:
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6 |
|
7 | - PrettyPrinter uses hnode.asdl?
|
8 | - color
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9 | - line wrapping -- do this later
|
10 | - would like CONTRIBUTORS here
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11 |
|
12 | - Unify with ASDL pretty printing - NIL8
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13 | - {} [] are identical
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14 | - () is for statically typed ASDL data
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15 | (command.Simple blame_tok:(...) words:[ ])
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16 | although we are also using [] for typed ASDL arrays, not just JSON
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17 | - object IDs
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18 | - @ x123 can create an ID
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19 | - ! x123 can reference an ID
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20 | - <> can be for non-J8 data types? For the = operator
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21 | - 'hi \(name)' interpolation is useful for code
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22 |
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23 | - Common between JSON8 and NIL8 - for writing by hand
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24 | - comments - # line or // line (JSON5 uses // line, following JS)
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25 | - unquoted identifier names - NIL8 could be more relaxed for (+ 1 (* 3 4))
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26 | - commas
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27 | - JSON8 could have trailing commas rule
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28 | - NIL8 at least has no commas for [1 2 "hi"]
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29 | """
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30 |
|
31 | import math
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32 |
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33 | from _devbuild.gen.id_kind_asdl import Id, Id_t, Id_str
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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 |
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37 | from asdl import format as fmt
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38 | from core import error
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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
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42 | from frontend import match
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43 | from mycpp import mops
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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
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50 |
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51 | from typing import cast, Dict, List, Tuple, Optional
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52 |
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53 |
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54 | # COPIED from ui.ValType() to break dep
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55 | def ValType(val):
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56 | # type: (value_t) -> str
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57 | """For displaying type errors in the UI."""
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58 |
|
59 | return value_str(val.tag(), dot=False)
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60 |
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61 |
|
62 | if mylib.PYTHON:
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63 |
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64 | def HeapValueId(val):
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65 | # type: (value_t) -> int
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66 | """
|
67 | Python's id() returns the address, which is up to 64 bits.
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68 |
|
69 | In C++ we can use the GC ID, which fits within 32 bits.
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70 | """
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71 | return id(val)
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72 |
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73 |
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74 | def ValueId(val):
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75 | # type: (value_t) -> int
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76 | """
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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
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80 | List, Dict, Func, Proc, etc.
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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.
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85 | """
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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
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90 | # Str is handled conservatively - when we add small string
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91 | # optimization, some strings will be values, so we assume all are.
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92 | return -1
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93 | else:
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94 | return HeapValueId(val)
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95 |
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96 |
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97 | def ValueIdString(val):
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98 | # type: (value_t) -> str
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99 | """Used by pp value (42) and = 42"""
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100 | heap_id = ValueId(val) # could be -1
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101 | if heap_id == -1:
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102 | return ''
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103 | else:
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104 | return ' 0x%s' % mylib.hex_lower(heap_id)
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105 |
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106 |
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107 | def Utf8Encode(code):
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108 | # type: (int) -> str
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109 | """Return utf-8 encoded bytes from a unicode code point.
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110 |
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111 | Based on https://stackoverflow.com/a/23502707
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112 | """
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113 | num_cont_bytes = 0
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114 |
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115 | if code <= 0x7F:
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116 | return chr(code & 0x7F) # ASCII
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117 |
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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:
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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 |
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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 |
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147 | # Hack until we fully translate
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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 |
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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 |
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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 |
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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 |
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174 | Caller must handle error.Encode()
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175 | Doesn't decay to b'' strings - will use Unicode replacement char.
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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 |
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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 |
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184 | # error.Encode should be impossible - we show cycles and non-data
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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 |
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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 |
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199 | _Print(value.Str(s), buf, -1)
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200 |
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201 |
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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 |
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206 | # TODO: add unquoted_ok here?
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207 | # /usr/local/foo-bar/x.y/a_b
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208 |
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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 |
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213 |
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214 | def MaybeEncodeJsonString(s):
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215 | # type: (str) -> str
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216 | """ For write --json """
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217 |
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218 | # TODO: add unquoted_ok here?
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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 |
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224 |
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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 |
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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
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236 | self.buf = buf
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237 | self.indent = indent
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238 | self.options = options
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239 |
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240 | # Key is vm.HeapValueId(val)
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241 | # Value is always True
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242 | # Dict[int, None] doesn't translate -- it would be nice to have a set()
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243 | self.visited = {} # type: Dict[int, int]
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244 |
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245 | def _ItemIndent(self, level):
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246 | # type: (int) -> None
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247 |
|
248 | if self.indent == -1:
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249 | return
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250 |
|
251 | self.buf.write_spaces((level + 1) * self.indent)
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252 |
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253 | def _BracketIndent(self, level):
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254 | # type: (int) -> None
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255 |
|
256 | if self.indent == -1:
|
257 | return
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258 |
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259 | self.buf.write_spaces(level * self.indent)
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260 |
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261 | def _MaybeNewline(self):
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262 | # type: () -> None
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263 | if self.indent == -1:
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264 | return
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265 | self.buf.write('\n')
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266 |
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267 | def _MaybeSpace(self):
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268 | # type: () -> None
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269 | if self.indent == -1:
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270 | return
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271 | self.buf.write(' ')
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272 |
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273 | def _PrintList(self, val, level):
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274 | # type: (value.List, int) -> None
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275 |
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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 |
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293 | def _PrintDict(self, val, level):
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294 | # type: (value.Dict, int) -> None
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295 |
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296 | if len(val.d) == 0: # Special case like Python/JS
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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:
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304 | self.buf.write(',')
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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 |
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311 | self.buf.write(':')
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312 | self._MaybeSpace()
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313 |
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314 | self.Print(v, level + 1)
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315 |
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316 | i += 1
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317 |
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318 | self._MaybeNewline()
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319 | self._BracketIndent(level)
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320 | self.buf.write('}')
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321 |
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322 | def Print(self, val, level=0):
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323 | # type: (value_t, int) -> None
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324 |
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325 | # special value that means everything is on one line
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326 | # It's like
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327 | # JSON.stringify(d, null, 0)
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328 | # except we use -1, not 0. 0 can still have newlines.
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329 |
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330 | UP_val = val
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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')
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334 |
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335 | elif case(value_e.Bool):
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336 | val = cast(value.Bool, UP_val)
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337 | self.buf.write('true' if val.b else 'false')
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338 |
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339 | elif case(value_e.Int):
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340 | val = cast(value.Int, UP_val)
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341 | # TODO: avoid intermediate allocation with
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342 | # self.buf.WriteBigInt(val.i)
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343 | #
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344 | # Or maybe we need pyj8.WriteBigInt() because truly BigInt may
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345 | # be of arbitrary length, and will need a growth strategy.
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346 | # Although that is not very common, so we could allocate in
|
347 | # that case.
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348 |
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349 | self.buf.write(mops.ToStr(val.i))
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350 |
|
351 | elif case(value_e.Float):
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352 | val = cast(value.Float, UP_val)
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353 |
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354 | fl = val.f
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355 | if ((self.options & INF_NAN_ARE_NULL) and
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356 | (math.isnan(fl) or math.isinf(fl))):
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357 | # JavaScript JSON lib behavior: Inf and NaN are null
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358 | # Python has a bug in the encoder by default, and then
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359 | # allow_nan=False raises an error
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360 | s = 'null'
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361 | else:
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362 | # TODO: can we avoid intermediate allocation?
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363 | # self.buf.WriteFloat(val.f)
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364 | s = str(fl)
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365 |
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366 | self.buf.write(s)
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367 |
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368 | elif case(value_e.Str):
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369 | val = cast(value.Str, UP_val)
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370 |
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371 | pyj8.WriteString(val.s, self.options, self.buf)
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372 |
|
373 | elif case(value_e.List):
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374 | val = cast(value.List, UP_val)
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375 |
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376 | # Cycle detection, only for containers that can be in cycles
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377 | heap_id = HeapValueId(val)
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378 |
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379 | node_state = self.visited.get(heap_id, UNSEEN)
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380 | if node_state == FINISHED:
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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.
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384 | self._PrintList(val, level)
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385 | return
|
386 | if node_state == EXPLORING:
|
387 | if self.options & SHOW_CYCLES:
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388 | self.buf.write('[ -->%s ]' % ValueIdString(val))
|
389 | return
|
390 | else:
|
391 | # node.js prints which index closes the cycle
|
392 | raise error.Encode(
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393 | "Can't encode List%s in object cycle" %
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394 | ValueIdString(val))
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395 |
|
396 | self.visited[heap_id] = EXPLORING
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397 | self._PrintList(val, level)
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398 | self.visited[heap_id] = FINISHED
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399 |
|
400 | elif case(value_e.Dict):
|
401 | val = cast(value.Dict, UP_val)
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402 |
|
403 | # Cycle detection, only for containers that can be in cycles
|
404 | heap_id = HeapValueId(val)
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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))
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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
|