Annotation of embedaddon/pcre/pcre_scanner.cc, revision 1.1.1.1
1.1 misho 1: // Copyright (c) 2005, Google Inc.
2: // All rights reserved.
3: //
4: // Redistribution and use in source and binary forms, with or without
5: // modification, are permitted provided that the following conditions are
6: // met:
7: //
8: // * Redistributions of source code must retain the above copyright
9: // notice, this list of conditions and the following disclaimer.
10: // * Redistributions in binary form must reproduce the above
11: // copyright notice, this list of conditions and the following disclaimer
12: // in the documentation and/or other materials provided with the
13: // distribution.
14: // * Neither the name of Google Inc. nor the names of its
15: // contributors may be used to endorse or promote products derived from
16: // this software without specific prior written permission.
17: //
18: // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19: // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20: // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21: // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22: // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23: // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24: // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25: // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26: // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27: // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28: // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29: //
30: // Author: Sanjay Ghemawat
31:
32: #ifdef HAVE_CONFIG_H
33: #include "config.h"
34: #endif
35:
36: #include <vector>
37: #include <assert.h>
38:
39: #include "pcrecpp_internal.h"
40: #include "pcre_scanner.h"
41:
42: using std::vector;
43:
44: namespace pcrecpp {
45:
46: Scanner::Scanner()
47: : data_(),
48: input_(data_),
49: skip_(NULL),
50: should_skip_(false),
51: skip_repeat_(false),
52: save_comments_(false),
53: comments_(NULL),
54: comments_offset_(0) {
55: }
56:
57: Scanner::Scanner(const string& in)
58: : data_(in),
59: input_(data_),
60: skip_(NULL),
61: should_skip_(false),
62: skip_repeat_(false),
63: save_comments_(false),
64: comments_(NULL),
65: comments_offset_(0) {
66: }
67:
68: Scanner::~Scanner() {
69: delete skip_;
70: delete comments_;
71: }
72:
73: void Scanner::SetSkipExpression(const char* re) {
74: delete skip_;
75: if (re != NULL) {
76: skip_ = new RE(re);
77: should_skip_ = true;
78: skip_repeat_ = true;
79: ConsumeSkip();
80: } else {
81: skip_ = NULL;
82: should_skip_ = false;
83: skip_repeat_ = false;
84: }
85: }
86:
87: void Scanner::Skip(const char* re) {
88: delete skip_;
89: if (re != NULL) {
90: skip_ = new RE(re);
91: should_skip_ = true;
92: skip_repeat_ = false;
93: ConsumeSkip();
94: } else {
95: skip_ = NULL;
96: should_skip_ = false;
97: skip_repeat_ = false;
98: }
99: }
100:
101: void Scanner::DisableSkip() {
102: assert(skip_ != NULL);
103: should_skip_ = false;
104: }
105:
106: void Scanner::EnableSkip() {
107: assert(skip_ != NULL);
108: should_skip_ = true;
109: ConsumeSkip();
110: }
111:
112: int Scanner::LineNumber() const {
113: // TODO: Make it more efficient by keeping track of the last point
114: // where we computed line numbers and counting newlines since then.
115: // We could use std:count, but not all systems have it. :-(
116: int count = 1;
117: for (const char* p = data_.data(); p < input_.data(); ++p)
118: if (*p == '\n')
119: ++count;
120: return count;
121: }
122:
123: int Scanner::Offset() const {
124: return (int)(input_.data() - data_.c_str());
125: }
126:
127: bool Scanner::LookingAt(const RE& re) const {
128: int consumed;
129: return re.DoMatch(input_, RE::ANCHOR_START, &consumed, 0, 0);
130: }
131:
132:
133: bool Scanner::Consume(const RE& re,
134: const Arg& arg0,
135: const Arg& arg1,
136: const Arg& arg2) {
137: const bool result = re.Consume(&input_, arg0, arg1, arg2);
138: if (result && should_skip_) ConsumeSkip();
139: return result;
140: }
141:
142: // helper function to consume *skip_ and honour save_comments_
143: void Scanner::ConsumeSkip() {
144: const char* start_data = input_.data();
145: while (skip_->Consume(&input_)) {
146: if (!skip_repeat_) {
147: // Only one skip allowed.
148: break;
149: }
150: }
151: if (save_comments_) {
152: if (comments_ == NULL) {
153: comments_ = new vector<StringPiece>;
154: }
155: // already pointing one past end, so no need to +1
156: int length = (int)(input_.data() - start_data);
157: if (length > 0) {
158: comments_->push_back(StringPiece(start_data, length));
159: }
160: }
161: }
162:
163:
164: void Scanner::GetComments(int start, int end, vector<StringPiece> *ranges) {
165: // short circuit out if we've not yet initialized comments_
166: // (e.g., when save_comments is false)
167: if (!comments_) {
168: return;
169: }
170: // TODO: if we guarantee that comments_ will contain StringPieces
171: // that are ordered by their start, then we can do a binary search
172: // for the first StringPiece at or past start and then scan for the
173: // ones contained in the range, quit early (use equal_range or
174: // lower_bound)
175: for (vector<StringPiece>::const_iterator it = comments_->begin();
176: it != comments_->end(); ++it) {
177: if ((it->data() >= data_.c_str() + start &&
178: it->data() + it->size() <= data_.c_str() + end)) {
179: ranges->push_back(*it);
180: }
181: }
182: }
183:
184:
185: void Scanner::GetNextComments(vector<StringPiece> *ranges) {
186: // short circuit out if we've not yet initialized comments_
187: // (e.g., when save_comments is false)
188: if (!comments_) {
189: return;
190: }
191: for (vector<StringPiece>::const_iterator it =
192: comments_->begin() + comments_offset_;
193: it != comments_->end(); ++it) {
194: ranges->push_back(*it);
195: ++comments_offset_;
196: }
197: }
198:
199: } // namespace pcrecpp
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