author | František Kučera <franta-hg@frantovo.cz> |
Tue, 05 Feb 2019 12:14:58 +0100 | |
branch | v_0 |
changeset 13 | c9fece435aa2 |
parent 12 | 7977c1bdba1f |
child 14 | 82bd0f57a889 |
permissions | -rw-r--r-- |
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/** |
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* Relational pipes |
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* Copyright © 2019 František Kučera (Frantovo.cz, GlobalCode.info) |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#pragma once |
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#include <memory> |
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#include <string> |
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#include <vector> |
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#include <iostream> |
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#include <sstream> |
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#include <locale> |
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#include <codecvt> |
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#include <regex> |
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#include <assert.h> |
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#include <libguile.h> |
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#include <relpipe/reader/typedefs.h> |
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#include <relpipe/reader/TypeId.h> |
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#include <relpipe/reader/handlers/RelationalReaderValueHandler.h> |
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#include <relpipe/reader/handlers/AttributeMetadata.h> |
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#include <relpipe/writer/Factory.h> |
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#include <relpipe/cli/RelpipeCLIException.h> |
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#include "Configuration.h" |
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namespace relpipe { |
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namespace tr { |
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namespace guile { |
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using namespace std; |
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using namespace relpipe; |
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using namespace relpipe::reader; |
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using namespace relpipe::reader::handlers; |
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class GuileHandler : public RelationalReaderValueHadler { |
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private: |
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std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings or use always UTF-8 between C++ and Guile |
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Configuration configuration; |
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writer::RelationalWriter* relationalWriter; |
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RelationConfiguration* currentRelationConfiguration = nullptr; |
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vector<AttributeMetadata> currentReaderMetadata; |
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vector<writer::AttributeMetadata> currentWriterMetadata; |
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integer_t currentAttributeIndex = 0; |
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boolean_t includeCurrentRecord = false; |
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/** |
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* @param attributeName name from relational pipe |
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* @return variable name in Guile |
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*/ |
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string_t a2v(const string_t& attributeName) { |
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// TODO: escape spaces and special characters |
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return L"$" + attributeName; |
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} |
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SCM toGuileSymbol(const string_t& name) { |
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return scm_string_to_symbol(scm_from_locale_string(convertor.to_bytes(name).c_str())); |
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} |
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/** |
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* @param code guile source code e.g. (+ 1 2 3) or #t |
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* @param defaultReturnValue is returned if code is empty |
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* @return result of code execution or defaultReturnValue |
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*/ |
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SCM evalGuileCode(const string_t& code, SCM defaultReturnValue = SCM_BOOL_F) { |
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if (code.size()) return scm_eval_string(toGuileValue(&code, typeid (string_t), TypeId::STRING)); |
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else return defaultReturnValue; |
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} |
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SCM toGuileValue(const void* value, const std::type_info& typeInfo, TypeId type) { |
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switch (type) { |
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case TypeId::BOOLEAN: |
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{ |
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assert(typeInfo == typeid (boolean_t)); |
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auto* typedValue = static_cast<const boolean_t*> (value); |
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return *typedValue ? SCM_BOOL_T : SCM_BOOL_F; |
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} |
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case TypeId::INTEGER: |
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{ |
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assert(typeInfo == typeid (integer_t)); |
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auto* typedValue = static_cast<const integer_t*> (value); |
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return scm_from_uint64(*typedValue); |
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} |
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case TypeId::STRING: |
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{ |
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assert(typeInfo == typeid (string_t)); |
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auto* typedValue = static_cast<const string_t*> (value); |
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return scm_from_locale_string(convertor.to_bytes(*typedValue).c_str()); |
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} |
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default: |
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throw cli::RelpipeCLIException(L"Unsupported type in toGuileValue()", cli::CLI::EXIT_CODE_UNEXPECTED_ERROR); |
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} |
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} |
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void defineGuileVariable(const string_t& name, const void* value, const std::type_info& typeInfo, TypeId type) { |
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scm_define(toGuileSymbol(name), toGuileValue(value, typeInfo, type)); |
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} |
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/** |
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* TODO: use a common method |
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*/ |
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bool parseBoolean(const string_t& value) { |
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if (value == L"true") return true; |
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else if (value == L"false") return false; |
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else throw relpipe::cli::RelpipeCLIException(L"Unable to parse boolean value: " + value + L" (expecting true or false)", relpipe::cli::CLI::EXIT_CODE_BAD_CLI_ARGUMENTS); |
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} |
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void defineGuileVariable(const DefinitionRecipe& definition) { |
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switch (relationalWriter->toTypeId(definition.type)) { |
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case writer::TypeId::BOOLEAN: |
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{ |
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boolean_t value = parseBoolean(definition.value); |
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defineGuileVariable(definition.name, &value, typeid (value), TypeId::BOOLEAN); |
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break; |
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} |
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case writer::TypeId::INTEGER: |
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{ |
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integer_t value = stoul(definition.value); |
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defineGuileVariable(definition.name, &value, typeid (value), TypeId::INTEGER); |
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break; |
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} |
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140 |
case writer::TypeId::STRING: |
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141 |
{ |
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142 |
defineGuileVariable(definition.name, &definition.value, typeid (definition.value), TypeId::STRING); |
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143 |
break; |
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|
144 |
} |
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145 |
default: |
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146 |
throw cli::RelpipeCLIException(L"Unsupported type in defineGuileVariable(): " + definition.type, cli::CLI::EXIT_CODE_UNEXPECTED_ERROR); |
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147 |
} |
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148 |
} |
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149 |
|
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150 |
void undefineGuileVariable(const string_t& name) { |
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151 |
scm_define(toGuileSymbol(name), scm_make_undefined_variable()); // undefined != (define n) |
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152 |
// TODO: or use: scm_variable_unset_x() ? |
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153 |
} |
0 | 154 |
|
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155 |
void writeGuileValueToAttribute(const writer::AttributeMetadata& attribute) { |
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156 |
string_t variableName = a2v(attribute.attributeName); |
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157 |
SCM guileValue = scm_eval_string(toGuileValue(&variableName, typeid (variableName), TypeId::STRING)); |
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158 |
|
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159 |
switch (attribute.typeId) { |
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160 |
case writer::TypeId::BOOLEAN: |
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161 |
{ |
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162 |
boolean_t value = scm_to_bool(guileValue); |
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163 |
return relationalWriter->writeAttribute(&value, typeid (value)); |
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164 |
} |
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165 |
case writer::TypeId::INTEGER: |
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166 |
{ |
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167 |
integer_t value = scm_to_uint64(guileValue); |
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168 |
return relationalWriter->writeAttribute(&value, typeid (value)); |
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|
169 |
} |
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170 |
case writer::TypeId::STRING: |
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171 |
{ |
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172 |
char* ch = scm_to_locale_string(guileValue); |
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173 |
string_t value = convertor.from_bytes(ch); |
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174 |
free(ch); |
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175 |
return relationalWriter->writeAttribute(&value, typeid (value)); |
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|
176 |
} |
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|
177 |
default: |
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178 |
throw cli::RelpipeCLIException(L"Unsupported type in writeGuileValueToAttribute()", cli::CLI::EXIT_CODE_UNEXPECTED_ERROR); |
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|
179 |
} |
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|
180 |
} |
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|
181 |
|
0 | 182 |
public: |
183 |
||
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|
184 |
GuileHandler(writer::RelationalWriter* relationalWriter, Configuration& configuration, const vector<string_t>& arguments) : relationalWriter(relationalWriter), configuration(configuration) { |
0 | 185 |
} |
186 |
||
187 |
void startRelation(string_t name, vector<AttributeMetadata> attributes) override { |
|
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188 |
if (currentRelationConfiguration) { |
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189 |
evalGuileCode(currentRelationConfiguration->guileAfterRecords); |
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|
190 |
for (DefinitionRecipe definition : currentRelationConfiguration->definitions) undefineGuileVariable(definition.name); |
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191 |
} |
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|
192 |
for (auto attribute : currentReaderMetadata) undefineGuileVariable(attribute.getAttributeName()); |
13
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|
193 |
|
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|
194 |
for (DefinitionRecipe definition : configuration.definitions) defineGuileVariable(definition); |
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|
195 |
|
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|
196 |
currentRelationConfiguration = nullptr; |
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|
197 |
for (int i = 0; i < configuration.relationConfigurations.size(); i++) { |
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|
198 |
if (regex_match(name, wregex(configuration.relationConfigurations[i].relation))) { |
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|
199 |
currentRelationConfiguration = &configuration.relationConfigurations[i]; |
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200 |
for (DefinitionRecipe definition : currentRelationConfiguration->definitions) defineGuileVariable(definition); |
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|
201 |
break; // it there are multiple matches, only the first configuration is used |
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|
202 |
} |
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|
203 |
} |
0 | 204 |
|
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|
205 |
currentReaderMetadata = attributes; |
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|
206 |
// TODO: move to a reusable method (or use same metadata on both reader and writer side?) |
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|
207 |
currentWriterMetadata.clear(); |
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|
208 |
if (currentRelationConfiguration && currentRelationConfiguration->writerMetadata.size()) { |
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|
209 |
currentWriterMetadata = currentRelationConfiguration->writerMetadata; |
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|
210 |
} else { |
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|
211 |
for (AttributeMetadata readerMetadata : attributes) currentWriterMetadata.push_back({readerMetadata.getAttributeName(), relationalWriter->toTypeId(readerMetadata.getTypeName())}); |
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|
212 |
} |
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changeset
|
213 |
|
5
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|
214 |
relationalWriter->startRelation(name, currentWriterMetadata, true); |
10
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Guile --before-records, --after-records and relpipe-relation-name variable
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|
215 |
|
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|
216 |
if (currentRelationConfiguration) { |
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|
217 |
// TODO: better variable name, object, function? |
f7f9a2553128
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|
218 |
defineGuileVariable(L"relpipe-relation-name", &name, typeid (name), TypeId::STRING); |
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|
219 |
evalGuileCode(currentRelationConfiguration->guileBeforeRecords); |
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|
220 |
} |
0 | 221 |
} |
222 |
||
5
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|
223 |
void attribute(const void* value, const std::type_info& type) override { |
8
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|
224 |
if (currentRelationConfiguration) { |
5
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|
225 |
defineGuileVariable(a2v(currentReaderMetadata[currentAttributeIndex].getAttributeName()), value, type, currentReaderMetadata[currentAttributeIndex].getTypeId()); |
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|
226 |
|
0 | 227 |
currentAttributeIndex++; |
228 |
||
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|
229 |
// TODO: > 0 ?: |
5
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|
230 |
if (currentAttributeIndex > 0 && currentAttributeIndex % currentReaderMetadata.size() == 0) { |
9
65f9d6b94f5c
Guile --for-each record
František Kučera <franta-hg@frantovo.cz>
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|
231 |
evalGuileCode(currentRelationConfiguration->guileForEach); |
65f9d6b94f5c
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|
232 |
includeCurrentRecord = scm_to_bool(evalGuileCode(currentRelationConfiguration->guileWhere, SCM_BOOL_T)); |
5
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|
233 |
if (includeCurrentRecord) for (auto attribute : currentWriterMetadata) writeGuileValueToAttribute(attribute); |
0 | 234 |
includeCurrentRecord = false; |
235 |
} |
|
236 |
||
5
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|
237 |
currentAttributeIndex = currentAttributeIndex % currentReaderMetadata.size(); |
0 | 238 |
} else { |
5
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|
239 |
relationalWriter->writeAttribute(value, type); |
0 | 240 |
} |
241 |
} |
|
242 |
||
243 |
void endOfPipe() { |
|
10
f7f9a2553128
Guile --before-records, --after-records and relpipe-relation-name variable
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|
244 |
if (currentRelationConfiguration) evalGuileCode(currentRelationConfiguration->guileAfterRecords); |
0 | 245 |
} |
246 |
||
247 |
}; |
|
248 |
||
249 |
} |
|
250 |
} |
|
251 |
} |