104ab5de1e
This allows for inserting it as a comment which is very useful while tweaking your typemappings as you can see what the input was.
119 lines
4.3 KiB
C++
119 lines
4.3 KiB
C++
#include "CodeBuilder.h"
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#include "FormatToStream.h"
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#include "Pgsql_Result.h"
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#include "IndentationConfig.h"
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#include "LanguageConfig.h"
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#include "ResultLoopTemplate.h"
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#include "StructureTemplate.h"
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#include "util.h"
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#include <QTextStream>
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void CodeBuilder::GenCodeForExecutingQuery(QTextStream &q, const QString &query, const Pgsql::Result &result, QString structname)
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{
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QString loop_template = m_configuration->resultLoopTemplate()->m_loopTemplate;;
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QString query_string_literal = ConvertToMultiLineCString(query);
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ColumnDataList columnData = createColumnDataList(result);
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auto get_var_func = [&] (QTextStream &out, QString var) {
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if (var == "structname") out << structname;
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else if (var == "queryliteral") out << query;
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else if (var == "assignfields") genFieldRetrieval(out, columnData);
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};
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// [optional] Gen declaration of result structure
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GenReturnStructDefinition(q, columnData, structname);
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// assume we have connection? What name???
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FormatToStream(q, loop_template, get_var_func);
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// gen code for creating and executing statement
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// - bind parameters
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// Gen code for iterating through result and filling the result struct/or local variables
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}
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void CodeBuilder::GenReturnStructDefinition(QTextStream &q, const ColumnDataList &columns, QString structname) const
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{
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std::shared_ptr<const StructureTemplate> templ = m_configuration->structureTemplate();
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auto struct_callback = [&] (QTextStream &out, QString var) {
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if (var == "structname") out << structname;
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else if (var == "structfields") genStructFields(out, columns);
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};
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FormatToStream(q, templ->m_structTemplate, struct_callback);
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}
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void CodeBuilder::genStructFields(QTextStream &q, const ColumnDataList &columns) const
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{
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std::shared_ptr<const StructureTemplate> templ = m_configuration->structureTemplate();
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QString field_format = templ->m_fieldTemplate;
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const int field_indent_levels = templ->m_fieldIndentation;
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QString field_indent_string = m_configuration->indentationConfig()->getIndentString(field_indent_levels);
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for (auto col : columns) {
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QString field_name = col.varName;
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Oid type_oid = col.oid;
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q << field_indent_string;
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genFieldDeclaration(q, field_format, field_name, type_oid);
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q << "\n";
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// Unfortunatly there is no easy reliable way to determine if a column can contain null values
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// For simple result columns we can have a look at the original column and if that has a NOT NULL constraint
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// then we can assume NOT NULL for the result if there are no LEFT/RIGHT JOINS or other constructs that can introduce NULL
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// values
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// Any way at generation time we might want to be able to specify the null handle
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// - exception/error return
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// - magic value
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// - std::optional
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// - boolean flags
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// - null pointer (useful for languages where this has no cost, other cases boolean flags will be more performant)
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}
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}
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QString CodeBuilder::columnNameToVariableName(QString column_name) const
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{
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return m_configuration->columnNameToFieldName(column_name);
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}
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TypeMappingResult CodeBuilder::getTypeName(Oid dbtype) const
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{
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return m_configuration->getTypeName(dbtype);
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}
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void CodeBuilder::genFieldRetrieval(QTextStream &q, const ColumnDataList &columns) const
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{
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QString assign_result_field_template = m_configuration->resultLoopTemplate()->m_retrieveValueTemplate;
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for (auto col : columns) {
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FormatToStream(q, assign_result_field_template, [&col] (QTextStream &out, QString var) {
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if (var == "varname") out << col.varName;
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});
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}
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}
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void CodeBuilder::genFieldDeclaration(QTextStream &q, const QString &format, const QString &field_name, Oid column_type) const
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{
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TypeMappingResult type_name = getTypeName(column_type);
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FormatToStream(q, format, [&] (QTextStream &out, QString var) {
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if (var == "typename") out << type_name.codeType();
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else if (var == "varname") out << field_name;
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else if (var == "dbtype") out << type_name.dbType();
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});
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}
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CodeBuilder::ColumnDataList CodeBuilder::createColumnDataList(const Pgsql::Result &result) const
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{
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ColumnDataList list;
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list.reserve(static_cast<size_t>(result.cols()));
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for (int column = 0; column < result.cols(); ++column) {
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Oid type_oid = result.type(column);
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QString column_name = result.getColName(column);
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QString field_name = columnNameToVariableName(column_name);
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list.push_back({type_oid, column_name, field_name});
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}
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return list;
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}
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