|
1 /** |
|
2 * Relational pipes |
|
3 * Copyright © 2019 František Kučera (Frantovo.cz, GlobalCode.info) |
|
4 * |
|
5 * This program is free software: you can redistribute it and/or modify |
|
6 * it under the terms of the GNU General Public License as published by |
|
7 * the Free Software Foundation, either version 3 of the License, or |
|
8 * (at your option) any later version. |
|
9 * |
|
10 * This program is distributed in the hope that it will be useful, |
|
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
|
13 * GNU General Public License for more details. |
|
14 * |
|
15 * You should have received a copy of the GNU General Public License |
|
16 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
|
17 */ |
|
18 #pragma once |
|
19 |
|
20 #include <memory> |
|
21 #include <string> |
|
22 #include <vector> |
|
23 #include <iostream> |
|
24 #include <sstream> |
|
25 #include <locale> |
|
26 #include <codecvt> |
|
27 #include <regex> |
|
28 |
|
29 #include <relpipe/reader/typedefs.h> |
|
30 #include <relpipe/reader/TypeId.h> |
|
31 #include <relpipe/reader/handlers/RelationalReaderStringHandler.h> |
|
32 #include <relpipe/reader/handlers/AttributeMetadata.h> |
|
33 |
|
34 #include <relpipe/writer/Factory.h> |
|
35 |
|
36 #include <relpipe/cli/RelpipeCLIException.h> |
|
37 |
|
38 namespace relpipe { |
|
39 namespace tr { |
|
40 namespace guile { |
|
41 |
|
42 using namespace std; |
|
43 using namespace relpipe; |
|
44 using namespace relpipe::reader; |
|
45 using namespace relpipe::reader::handlers; |
|
46 |
|
47 class GuileHandler : public RelationalReaderStringHadler { |
|
48 private: |
|
49 shared_ptr<writer::RelationalWriter> relationalWriter; |
|
50 |
|
51 wregex relationNameRegEx; |
|
52 |
|
53 vector<AttributeMetadata> currentMetadata; |
|
54 vector<string_t> currentRecord; |
|
55 integer_t currentAttributeIndex = 0; |
|
56 boolean_t includeCurrentRecord = false; |
|
57 boolean_t filterCurrentRelation = false; |
|
58 |
|
59 public: |
|
60 |
|
61 GuileHandler(ostream& output, const vector<string_t>& arguments) { |
|
62 relationalWriter.reset(writer::Factory::create(output)); |
|
63 |
|
64 // TODO: options and parser |
|
65 if (arguments.size() == 1) { |
|
66 relationNameRegEx = wregex(arguments[0]); |
|
67 } else { |
|
68 throw cli::RelpipeCLIException(L"Usage: relpipe-tr-guile <relationNameRegExp>", cli::CLI::EXIT_CODE_UNKNOWN_COMMAND); |
|
69 } |
|
70 } |
|
71 |
|
72 void startRelation(string_t name, vector<AttributeMetadata> attributes) override { |
|
73 currentMetadata = attributes; |
|
74 // TODO: move to a reusable method (or use same metadata on both reader and writer side?) |
|
75 vector<writer::AttributeMetadata> writerMetadata; |
|
76 for (AttributeMetadata readerMetadata : attributes) { |
|
77 writerMetadata.push_back({readerMetadata.getAttributeName(), relationalWriter->toTypeId(readerMetadata.getTypeName())}); |
|
78 } |
|
79 |
|
80 currentRecord.resize(attributes.size()); |
|
81 filterCurrentRelation = regex_match(name, relationNameRegEx); |
|
82 |
|
83 relationalWriter->startRelation(name, writerMetadata, true); |
|
84 } |
|
85 |
|
86 void attribute(const string_t& value) override { |
|
87 if (filterCurrentRelation) { |
|
88 // TODO: evaluate condition and updates in Guile |
|
89 currentRecord[currentAttributeIndex] = value; |
|
90 includeCurrentRecord = false; |
|
91 |
|
92 currentAttributeIndex++; |
|
93 |
|
94 if (currentAttributeIndex > 0 && currentAttributeIndex % currentMetadata.size() == 0) { |
|
95 if (includeCurrentRecord) for (string_t v : currentRecord) relationalWriter->writeAttribute(v); |
|
96 includeCurrentRecord = false; |
|
97 } |
|
98 |
|
99 currentAttributeIndex = currentAttributeIndex % currentMetadata.size(); |
|
100 } else { |
|
101 relationalWriter->writeAttribute(value); |
|
102 } |
|
103 } |
|
104 |
|
105 void endOfPipe() { |
|
106 |
|
107 } |
|
108 |
|
109 }; |
|
110 |
|
111 } |
|
112 } |
|
113 } |