b210c570fc
instead the length of the string can be passed in. This is first step in process to allow Value to work without null terminator.
53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
#ifndef ARRAYPARSER_H
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#define ARRAYPARSER_H
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#include <optional>
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#include <tuple>
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#include <string>
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#include <string_view>
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namespace Pgsql {
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/** Class for parsing array values coming from postgresql
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*
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* exceptions are used to report serious errors
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* in production these kind of errors should rarely happen as
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* they are either a bug in this parser or postgres changed its format.
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*/
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class ArrayParser {
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public:
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/**
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* \param data The string that needs parsing (warning just the pointer is stored, the string is not copied)
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*/
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ArrayParser(const char *array_string, int length);
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class NextElemResult {
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public:
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bool ok;
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std::optional<std::string_view> value;
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};
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/**
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*
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* Usage:
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* auto [ok, val] = parser.GetNextElem();
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*
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* \return the bool signals if there was a next element when it is true or the end of the array in which
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* case it is false. The optional is not set when the next element IS NULL. Otherwise it refers to the
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* string value of the element. If the element was quoted it has been stripped of quotes and escapes.
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*/
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NextElemResult GetNextElem();
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private:
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const char *data;
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const char *end;
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std::string temp; // internal buffer for when a value needs escaping
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const char *pos;
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void parseQuotedValue();
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void initializeParse();
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/** Moves pos forward to the first non whitespace character.
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*/
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void skipWhitespace();
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};
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} // end namespace Pgsql
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#endif // ARRAYPARSER_H
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