1 // util.cc
2
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 //
15 // Copyright 2005-2010 Google, Inc.
16 // Author: riley@google.com (Michael Riley)
17 //
18 // \file
19 // FST utility definitions.
20
21 #include <cctype>
22 #include <string>
23 #include <fst/util.h>
24
25 // Utility flag definitions
26
27 DEFINE_bool(fst_error_fatal, true,
28 "FST errors are fatal; o.w. return objects flagged as bad: "
29 " e.g., FSTs - kError prop. true, FST weights - not a member()");
30
31 namespace fst {
32
StrToInt64(const string & s,const string & src,size_t nline,bool allow_negative=false,bool * error)33 int64 StrToInt64(const string &s, const string &src, size_t nline,
34 bool allow_negative = false, bool *error) {
35 int64 n;
36 const char *cs = s.c_str();
37 char *p;
38 if (error) *error = false;
39 n = strtoll(cs, &p, 10);
40 if (p < cs + s.size() || (!allow_negative && n < 0)) {
41 FSTERROR() << "StrToInt64: Bad integer = " << s
42 << "\", source = " << src << ", line = " << nline;
43 if (error) *error = true;
44 return 0;
45 }
46 return n;
47 }
48
Int64ToStr(int64 n,string * s)49 void Int64ToStr(int64 n, string *s) {
50 ostringstream nstr;
51 nstr << n;
52 *s = nstr.str();
53 }
54
ConvertToLegalCSymbol(string * s)55 void ConvertToLegalCSymbol(string *s) {
56 for (string::iterator it = s->begin(); it != s->end(); ++it)
57 if (!isalnum(*it)) *it = '_';
58 }
59
60 // Skips over input characters to align to 'align' bytes. Returns
61 // false if can't align.
AlignInput(istream & strm,int align)62 bool AlignInput(istream &strm, int align) {
63 char c;
64 for (int i = 0; i < align; ++i) {
65 int64 pos = strm.tellg();
66 if (pos < 0) {
67 LOG(ERROR) << "AlignInput: can't determine stream position";
68 return false;
69 }
70 if (pos % align == 0) break;
71 strm.read(&c, 1);
72 }
73 return true;
74 }
75
76 // Write null output characters to align to 'align' bytes. Returns
77 // false if can't align.
AlignOutput(ostream & strm,int align)78 bool AlignOutput(ostream &strm, int align) {
79 for (int i = 0; i < align; ++i) {
80 int64 pos = strm.tellp();
81 if (pos < 0) {
82 LOG(ERROR) << "AlignOutput: can't determine stream position";
83 return false;
84 }
85 if (pos % align == 0) break;
86 strm.write("", 1);
87 }
88 return true;
89 }
90
91
92 } // namespace fst
93