1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
#
#
# The Nim Compiler
# (c) Copyright 2012 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## Serialization utilities for the compiler.
import strutils, math
proc c_snprintf(s: cstring; n:uint; frmt: cstring): cint {.importc: "snprintf", header: "<stdio.h>", nodecl, varargs.}
proc toStrMaxPrecision*(f: BiggestFloat, literalPostfix = ""): string =
case classify(f)
of fcNaN:
result = "NAN"
of fcNegZero:
result = "-0.0" & literalPostfix
of fcZero:
result = "0.0" & literalPostfix
of fcInf:
result = "INF"
of fcNegInf:
result = "-INF"
else:
when defined(nimNoArrayToCstringConversion):
result = newString(81)
let n = c_snprintf(result.cstring, result.len.uint, "%#.16e%s", f, literalPostfix.cstring)
setLen(result, n)
else:
var buf: array[0..80, char]
discard c_snprintf(buf.cstring, buf.len.uint, "%#.16e%s", f, literalPostfix.cstring)
result = $buf.cstring
proc encodeStr*(s: string, result: var string) =
for i in countup(0, len(s) - 1):
case s[i]
of 'a'..'z', 'A'..'Z', '0'..'9', '_': add(result, s[i])
else: add(result, '\\' & toHex(ord(s[i]), 2))
proc hexChar(c: char, xi: var int) =
case c
of '0'..'9': xi = (xi shl 4) or (ord(c) - ord('0'))
of 'a'..'f': xi = (xi shl 4) or (ord(c) - ord('a') + 10)
of 'A'..'F': xi = (xi shl 4) or (ord(c) - ord('A') + 10)
else: discard
proc decodeStr*(s: cstring, pos: var int): string =
var i = pos
result = ""
while true:
case s[i]
of '\\':
inc(i, 3)
var xi = 0
hexChar(s[i-2], xi)
hexChar(s[i-1], xi)
add(result, chr(xi))
of 'a'..'z', 'A'..'Z', '0'..'9', '_':
add(result, s[i])
inc(i)
else: break
pos = i
const
chars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
{.push overflowChecks: off.}
# since negative numbers require a leading '-' they use up 1 byte. Thus we
# subtract/add `vintDelta` here to save space for small negative numbers
# which are common in ROD files:
const
vintDelta = 5
template encodeIntImpl(self) =
var d: char
var v = x
var rem = v mod 190
if rem < 0:
add(result, '-')
v = - (v div 190)
rem = - rem
else:
v = v div 190
var idx = int(rem)
if idx < 62: d = chars[idx]
else: d = chr(idx - 62 + 128)
if v != 0: self(v, result)
add(result, d)
proc encodeVBiggestIntAux(x: BiggestInt, result: var string) =
## encode a biggest int as a variable length base 190 int.
encodeIntImpl(encodeVBiggestIntAux)
proc encodeVBiggestInt*(x: BiggestInt, result: var string) =
## encode a biggest int as a variable length base 190 int.
encodeVBiggestIntAux(x +% vintDelta, result)
# encodeIntImpl(encodeVBiggestInt)
proc encodeVIntAux(x: int, result: var string) =
## encode an int as a variable length base 190 int.
encodeIntImpl(encodeVIntAux)
proc encodeVInt*(x: int, result: var string) =
## encode an int as a variable length base 190 int.
encodeVIntAux(x +% vintDelta, result)
template decodeIntImpl() =
var i = pos
var sign = - 1
assert(s[i] in {'a'..'z', 'A'..'Z', '0'..'9', '-', '\x80'..'\xFF'})
if s[i] == '-':
inc(i)
sign = 1
result = 0
while true:
case s[i]
of '0'..'9': result = result * 190 - (ord(s[i]) - ord('0'))
of 'a'..'z': result = result * 190 - (ord(s[i]) - ord('a') + 10)
of 'A'..'Z': result = result * 190 - (ord(s[i]) - ord('A') + 36)
of '\x80'..'\xFF': result = result * 190 - (ord(s[i]) - 128 + 62)
else: break
inc(i)
result = result * sign -% vintDelta
pos = i
proc decodeVInt*(s: cstring, pos: var int): int =
decodeIntImpl()
proc decodeVBiggestInt*(s: cstring, pos: var int): BiggestInt =
decodeIntImpl()
{.pop.}
iterator decodeVIntArray*(s: cstring): int =
var i = 0
while s[i] != '\0':
yield decodeVInt(s, i)
if s[i] == ' ': inc i
iterator decodeStrArray*(s: cstring): string =
var i = 0
while s[i] != '\0':
yield decodeStr(s, i)
if s[i] == ' ': inc i
|