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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
#include "bu/xmlreader.h"
#include "bu/stream.h"
#include "bu/exceptions.h"
Bu::XmlReader::XmlReader( Stream &rInput ) :
rInput( rInput ),
iCurToken( 0 ),
iNextToken( 0 ),
bIgnoreWS( true )
{
nextToken();
stDocument();
}
Bu::XmlReader::~XmlReader()
{
}
void Bu::XmlReader::fillBuffer()
{
if( rInput.isEOS() )
return;
char buf[1024];
int iSize = rInput.read( buf, 1024 );
sBuf.append( buf, iSize );
}
void Bu::XmlReader::cleanupBuffer( int iUsed )
{
for( int j = 0; j < iUsed; j++ )
{
if( sBuf[j] == '\n' )
{
spNextToken.iLine++;
spNextToken.iChar = 1;
}
else
{
spNextToken.iChar++;
}
}
printf("--Deleting %d bytes from front of buffer.\n", iUsed );
sBuf.trimFront( iUsed );
}
int Bu::XmlReader::nextToken()
{
fillBuffer();
int iUsed = 1;
iCurToken = iNextToken;
spCurToken = spNextToken;
switch( sBuf[0] )
{
case '<':
if( !strncmp( sBuf.getStr(), "<?xml", 5 ) )
{
iNextToken = tokXmlDeclHead;
iUsed = 5;
}
else
{
iNextToken = '<';
}
break;
case '?':
if( sBuf[1] == '>' )
{
iNextToken = tokXmlDeclEnd;
iUsed = 2;
}
else
{
iNextToken = '?';
}
break;
case ' ':
case '\t':
case '\n':
case '\r':
for( int j = 1;; j++ )
{
if( j == sBuf.getSize() )
{
if( rInput.isEOS() )
error("Reached end of input while waiting for whitespace to end.");
fillBuffer();
}
if( sBuf[j] == ' ' || sBuf[j] == '\t' ||
sBuf[j] == '\n' || sBuf[j] == '\r' )
iUsed++;
else
break;
}
sStr.clear();
sStr.append( sBuf, iUsed );
iNextToken = tokWS;
break;
case '=':
iNextToken = sBuf[0];
break;
default:
if( (sBuf[0] >= 'a' && sBuf[0] <= 'z') ||
(sBuf[0] >= 'A' && sBuf[0] <= 'Z') )
{
for( int j = 1;; j++ )
{
if( j == sBuf.getSize() )
{
if( rInput.isEOS() )
error("Reached end of input while waiting for a string to end.");
fillBuffer();
}
if( (sBuf[j] >= 'a' && sBuf[j] <= 'z') ||
(sBuf[j] >= 'A' && sBuf[j] <= 'Z') )
iUsed++;
else
break;
}
sStr.clear();
sStr.append( sBuf, iUsed );
iNextToken = tokIdent;
}
}
cleanupBuffer( iUsed );
return iCurToken;
}
void Bu::XmlReader::error( const char *sMessage )
{
throw Bu::XmlException("%d:%d: %s",
spCurToken.iLine, spCurToken.iChar, sMessage );
}
void Bu::XmlReader::stDocument()
{
stProlog();
}
void Bu::XmlReader::stProlog()
{
stXmlDecl();
}
void Bu::XmlReader::stXmlDecl()
{
if( nextToken() != tokXmlDeclHead )
error("You must begin your xml file with a declaration: <?xml ... ?>");
if( nextToken() != tokIdent )
error("A version comes first!");
if( sStr != "version" )
error("No, a version!");
}
|
