1 | #include <fstream> |
---|
2 | #include "token.h" |
---|
3 | #include "tofromstring.h" |
---|
4 | |
---|
5 | // |
---|
6 | // a token is a record in the pool file. |
---|
7 | // Format: |
---|
8 | // nmmmsssssssssssssssssssssssssssssssssssssssssssssssssssssssss |
---|
9 | // || | |
---|
10 | // || string |
---|
11 | // |number of times this string has been geven out |
---|
12 | // 0: not ready. 1: ready |
---|
13 | // |
---|
14 | // constructor: |
---|
15 | token::token() |
---|
16 | { |
---|
17 | this->setvalue(""); // value (string) |
---|
18 | this->setlinenr(0); // line number |
---|
19 | this->clearstatus(); // status: ready or not |
---|
20 | this->setcommitted(0); // counter |
---|
21 | this->pmarker = "pp"; // this marks the start of the pointer record |
---|
22 | this->pmarkerlen = this->pmarker.length(); |
---|
23 | } |
---|
24 | void token::clearstatus() |
---|
25 | { |
---|
26 | this->status = '0'; |
---|
27 | } |
---|
28 | char token::getstatus(void) |
---|
29 | { |
---|
30 | return this->status; |
---|
31 | } |
---|
32 | void token::ready() |
---|
33 | { |
---|
34 | this->status = '1'; |
---|
35 | } |
---|
36 | bool token::getready(void) |
---|
37 | { |
---|
38 | return this->status == '1'; |
---|
39 | } |
---|
40 | void token::setvalue(std::string v) |
---|
41 | { |
---|
42 | this->value = v; |
---|
43 | } |
---|
44 | void token::setlinenr(unsigned int l) |
---|
45 | { |
---|
46 | this->linenr = l; |
---|
47 | } |
---|
48 | unsigned int token::getlinenr(void) |
---|
49 | { |
---|
50 | return this->linenr; |
---|
51 | } |
---|
52 | std::string token::getvalue(void) |
---|
53 | { |
---|
54 | return this->value; |
---|
55 | } |
---|
56 | void token::setcommitted(unsigned int n) |
---|
57 | { |
---|
58 | this->committed = n; |
---|
59 | } |
---|
60 | unsigned int token::getcommitted(void) |
---|
61 | { |
---|
62 | return this->committed; |
---|
63 | } |
---|
64 | std::string token::gettotal(void) |
---|
65 | { |
---|
66 | return this->status + to_string(this->committed,comlen) + |
---|
67 | to_string(this->linenr,linenrlen)+ this->value; |
---|
68 | } |
---|
69 | // |
---|
70 | // puts everything that we know in repective variables |
---|
71 | // |
---|
72 | int token::puttotal(std::string t) |
---|
73 | { |
---|
74 | if (t.length() < this->valuestart) |
---|
75 | return 1; |
---|
76 | // check that all chars before the value are [0-9]: |
---|
77 | for (unsigned int i=0; i<valuestart; i++) |
---|
78 | { |
---|
79 | if (t[i] < '0' || t[i] > '9') |
---|
80 | return 1; |
---|
81 | } |
---|
82 | |
---|
83 | switch (t[this->statstart]) |
---|
84 | { |
---|
85 | case '0': break; |
---|
86 | case '1': break; |
---|
87 | default: return 1; |
---|
88 | break; |
---|
89 | } |
---|
90 | |
---|
91 | this->committed = from_string<long>(t.substr(comstart,comlen)); |
---|
92 | this->status = t[0]; |
---|
93 | this->linenr = from_string<unsigned int>(t.substr(linenrstart,linenrlen)); |
---|
94 | if (t.length() == valuestart) |
---|
95 | this->value=""; |
---|
96 | else |
---|
97 | this->value=t.substr(valuestart); |
---|
98 | return 0; |
---|
99 | } |
---|
100 | // |
---|
101 | // the file with the tokens |
---|
102 | // |
---|
103 | void token::setfile(std::fstream& file) |
---|
104 | { |
---|
105 | this->file = &file; |
---|
106 | } |
---|
107 | |
---|
108 | // |
---|
109 | // read token from file, from position pos, possibly |
---|
110 | // wrap around |
---|
111 | // on return: posused is used position |
---|
112 | // posnext is position of next token |
---|
113 | // |
---|
114 | int token::readnext(std::streampos pos, std::streampos& posused, std::streampos& posnext) |
---|
115 | { |
---|
116 | // |
---|
117 | // note: file is member of class token |
---|
118 | // |
---|
119 | posused = pos; |
---|
120 | file->seekg(posused); |
---|
121 | std::string line; |
---|
122 | getline(*file,line); |
---|
123 | if (file->eof() || file->fail() || file->bad()) |
---|
124 | return -1; |
---|
125 | if (line.substr(0,this->pmarkerlen) == this->pmarker) |
---|
126 | { |
---|
127 | posused = 0; |
---|
128 | file->seekg(posused); |
---|
129 | getline(*file,line); |
---|
130 | if (line.substr(0,this->pmarkerlen) == this->pmarker) |
---|
131 | return -1; |
---|
132 | } |
---|
133 | if (file->eof() || file->fail() || file->bad()) |
---|
134 | return -1; |
---|
135 | posnext = file->tellg(); |
---|
136 | return puttotal(line); |
---|
137 | } |
---|
138 | |
---|
139 | // |
---|
140 | // rewrite token on position p |
---|
141 | // on return, p contains the postion of the next token |
---|
142 | // |
---|
143 | int token::writetoken(std::streampos& p) |
---|
144 | { |
---|
145 | this->file->seekp(p); |
---|
146 | *file << this->gettotal() << std::endl; |
---|
147 | p = this->file->tellp(); |
---|
148 | this->file->flush(); |
---|
149 | |
---|
150 | return 0; |
---|
151 | } |
---|
152 | |
---|
153 | // |
---|
154 | // rewrites the location pointer |
---|
155 | // |
---|
156 | int token::writelocpointer(std::streampos locpointer) |
---|
157 | { |
---|
158 | // |
---|
159 | // note: in this function, file is member of class token |
---|
160 | // |
---|
161 | std::streampos g = file->tellg(); |
---|
162 | std::streampos p = file->tellp(); |
---|
163 | // |
---|
164 | // check if last line already contains locpointer |
---|
165 | // |
---|
166 | file->seekg(0,std::ios::end); |
---|
167 | long long filelength = file->tellg(); |
---|
168 | long long l = this->pointerlen +this->pmarkerlen+2; |
---|
169 | if ( l > filelength) |
---|
170 | { |
---|
171 | // |
---|
172 | // this file has no locpointer |
---|
173 | // |
---|
174 | file->seekp(0,std::ios::end); |
---|
175 | } |
---|
176 | else |
---|
177 | { |
---|
178 | file->seekg(-l,std::ios::end); |
---|
179 | char c = file->get(); |
---|
180 | std::string line; |
---|
181 | getline(*file,line); |
---|
182 | if (line.length() == this->pointerlen + this->pmarkerlen |
---|
183 | && line.substr(0,pmarkerlen) == pmarker |
---|
184 | && c == '\n') |
---|
185 | { |
---|
186 | // |
---|
187 | // this is a record with a locpointer value |
---|
188 | // |
---|
189 | file->seekp(-(std::streampos)((this->pointerlen)+this->pmarkerlen+1),std::ios::end); |
---|
190 | } |
---|
191 | else |
---|
192 | { |
---|
193 | file->seekp(0,std::ios::end); |
---|
194 | } |
---|
195 | } |
---|
196 | *file << pmarker << std::setfill('0') << std::setw(this->pointerlen) << |
---|
197 | locpointer << std::endl; |
---|
198 | file->flush(); |
---|
199 | file->seekg(g); |
---|
200 | file->seekp(p); |
---|
201 | return 0; |
---|
202 | } |
---|
203 | |
---|
204 | // |
---|
205 | // reads the location pinter |
---|
206 | // returns the value of the location pointer, |
---|
207 | // -1 if error |
---|
208 | // |
---|
209 | std::streampos token::readlocpointer() |
---|
210 | { |
---|
211 | std::streampos g = file->tellg(); |
---|
212 | |
---|
213 | long long l = this->pointerlen + this->pmarkerlen +2; |
---|
214 | file->seekg(0,std::ios::end); |
---|
215 | char c; |
---|
216 | if (file->tellg() < l) |
---|
217 | { |
---|
218 | file->seekg(0); |
---|
219 | c = '\n'; |
---|
220 | } |
---|
221 | else |
---|
222 | { |
---|
223 | file->seekg(-l,std::ios::end); |
---|
224 | c = file->get(); |
---|
225 | } |
---|
226 | std::string line; |
---|
227 | getline(*file,line); |
---|
228 | if (line.length() == this->pointerlen + this->pmarkerlen |
---|
229 | && line.substr(0,pmarkerlen) == pmarker |
---|
230 | && c == '\n') |
---|
231 | return from_string<long>(line.substr(2)); |
---|
232 | else |
---|
233 | return -1; |
---|
234 | file->seekg(g); |
---|
235 | return 0; |
---|
236 | } |
---|