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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
#include <antlr/config.h>
#include <string>
#include <list>
#include <vector>
#include <map>
#include <utility>
#include <iostream>
#include <iterator>
#include <sstream>
#include <cassert>
#include <antlr/TokenStream.h>
#include <antlr/TokenWithIndex.h>
#include <antlr/BitSet.h>
#include <antlr/TokenStreamRewriteEngine.h>
#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
namespace antlr {
#endif
#ifndef NO_STATIC_CONSTS
const size_t TokenStreamRewriteEngine::MIN_TOKEN_INDEX = 0;
const int TokenStreamRewriteEngine::PROGRAM_INIT_SIZE = 100;
#endif
const char* TokenStreamRewriteEngine::DEFAULT_PROGRAM_NAME = "default";
namespace {
struct compareOperationIndex {
typedef TokenStreamRewriteEngine::RewriteOperation RewriteOperation;
bool operator() ( const RewriteOperation* a, const RewriteOperation* b ) const
{
return a->getIndex() < b->getIndex();
}
};
struct dumpTokenWithIndex {
dumpTokenWithIndex( ANTLR_USE_NAMESPACE(std)ostream& o ) : out(o) {}
void operator() ( const RefTokenWithIndex& t ) {
out << "[txt='" << t->getText() << "' tp=" << t->getType() << " idx=" << t->getIndex() << "]\n";
}
ANTLR_USE_NAMESPACE(std)ostream& out;
};
}
TokenStreamRewriteEngine::TokenStreamRewriteEngine(TokenStream& upstream)
: stream(upstream)
, index(MIN_TOKEN_INDEX)
, tokens()
, programs()
, discardMask()
{
}
TokenStreamRewriteEngine::TokenStreamRewriteEngine(TokenStream& upstream, size_t initialSize )
: stream(upstream)
, index(MIN_TOKEN_INDEX)
, tokens(initialSize)
, programs()
, discardMask()
{
}
RefToken TokenStreamRewriteEngine::nextToken( void )
{
RefTokenWithIndex t;
// suck tokens until end of stream or we find a non-discarded token
do {
t = RefTokenWithIndex(stream.nextToken());
if ( t )
{
t->setIndex(index); // what is t's index in list?
if ( t->getType() != Token::EOF_TYPE ) {
tokens.push_back(t); // track all tokens except EOF
}
index++; // move to next position
}
} while ( t && discardMask.member(t->getType()) );
return RefToken(t);
}
void TokenStreamRewriteEngine::rollback( const std::string& programName,
size_t instructionIndex )
{
program_map::iterator rewrite = programs.find(programName);
if( rewrite != programs.end() )
{
operation_list& prog = rewrite->second;
operation_list::iterator
j = prog.begin(),
end = prog.end();
std::advance(j,instructionIndex);
if( j != end )
prog.erase(j, end);
}
}
void TokenStreamRewriteEngine::originalToStream( std::ostream& out,
size_t start,
size_t end ) const
{
token_list::const_iterator s = tokens.begin();
std::advance( s, start );
token_list::const_iterator e = s;
std::advance( e, end-start );
std::for_each( s, e, tokenToStream(out) );
}
void TokenStreamRewriteEngine::toStream( std::ostream& out,
const std::string& programName,
size_t firstToken,
size_t lastToken ) const
{
if( tokens.size() == 0 )
return;
program_map::const_iterator rewriter = programs.find(programName);
if ( rewriter == programs.end() )
return;
// get the prog and some iterators in it...
const operation_list& prog = rewriter->second;
operation_list::const_iterator
rewriteOpIndex = prog.begin(),
rewriteOpEnd = prog.end();
size_t tokenCursor = firstToken;
// make sure we don't run out of the tokens we have...
if( lastToken > (tokens.size() - 1) )
lastToken = tokens.size() - 1;
while ( tokenCursor <= lastToken )
{
// std::cout << "tokenCursor = " << tokenCursor << " first prog index = " << (*rewriteOpIndex)->getIndex() << std::endl;
if( rewriteOpIndex != rewriteOpEnd )
{
size_t up_to_here = std::min(lastToken,(*rewriteOpIndex)->getIndex());
while( tokenCursor < up_to_here )
out << tokens[tokenCursor++]->getText();
}
while ( rewriteOpIndex != rewriteOpEnd &&
tokenCursor == (*rewriteOpIndex)->getIndex() &&
tokenCursor <= lastToken )
{
tokenCursor = (*rewriteOpIndex)->execute(out);
++rewriteOpIndex;
}
if( tokenCursor <= lastToken )
out << tokens[tokenCursor++]->getText();
}
// std::cout << "Handling tail operations # left = " << std::distance(rewriteOpIndex,rewriteOpEnd) << std::endl;
// now see if there are operations (append) beyond last token index
std::for_each( rewriteOpIndex, rewriteOpEnd, executeOperation(out) );
rewriteOpIndex = rewriteOpEnd;
}
void TokenStreamRewriteEngine::toDebugStream( std::ostream& out,
size_t start,
size_t end ) const
{
token_list::const_iterator s = tokens.begin();
std::advance( s, start );
token_list::const_iterator e = s;
std::advance( e, end-start );
std::for_each( s, e, dumpTokenWithIndex(out) );
}
void TokenStreamRewriteEngine::addToSortedRewriteList( const std::string& programName,
RewriteOperation* op )
{
program_map::iterator rewrites = programs.find(programName);
// check if we got the program already..
if ( rewrites == programs.end() )
{
// no prog make a new one...
operation_list ops;
ops.push_back(op);
programs.insert(std::make_pair(programName,ops));
return;
}
operation_list& prog = rewrites->second;
if( prog.empty() )
{
prog.push_back(op);
return;
}
operation_list::iterator i, end = prog.end();
i = end;
--i;
// if at or beyond last op's index, just append
if ( op->getIndex() >= (*i)->getIndex() ) {
prog.push_back(op); // append to list of operations
return;
}
i = prog.begin();
if( i != end )
{
operation_list::iterator pos = std::upper_bound( i, end, op, compareOperationIndex() );
prog.insert(pos,op);
}
else
prog.push_back(op);
}
#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
}
#endif
|
