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https://github.com/NixOS/nix
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3 changed files with 308 additions and 282 deletions
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@ -9,41 +9,45 @@
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#include <boost/format.hpp>
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namespace nix {
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namespace nix
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{
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typedef enum {
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typedef enum {
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elWarning,
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elError
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} ErrLevel;
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class ColumnRange {
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public:
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unsigned int start;
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unsigned int len;
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class ColumnRange
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{
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public:
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unsigned int start;
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unsigned int len;
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};
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class ErrorInfo;
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class ErrLine {
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public:
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int lineNumber;
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std::optional<ColumnRange> columnRange;
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std::optional<string> prevLineOfCode;
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string errLineOfCode;
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std::optional<string> nextLineOfCode;
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class ErrLine
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{
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public:
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int lineNumber;
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std::optional<ColumnRange> columnRange;
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std::optional<string> prevLineOfCode;
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string errLineOfCode;
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std::optional<string> nextLineOfCode;
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};
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class NixCode {
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public:
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std::optional<string> nixFile;
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std::optional<ErrLine> errLine;
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class NixCode
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{
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public:
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std::optional<string> nixFile;
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std::optional<ErrLine> errLine;
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ErrLine& ensureErrLine()
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{
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if (!this->errLine.has_value())
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this->errLine = std::optional(ErrLine());
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return *this->errLine;
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}
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ErrLine& ensureErrLine()
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{
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if (!this->errLine.has_value())
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this->errLine = std::optional(ErrLine());
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return *this->errLine;
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}
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};
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// -------------------------------------------------
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@ -65,149 +69,180 @@ class AddNixFile;
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template <class T>
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class AddErrLine;
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template <class T>
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template <class T>
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class AddLineNumber;
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template <class T>
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template <class T>
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class AddColumnRange;
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template <class T>
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template <class T>
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class AddLOC;
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// The error info class itself.
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class ErrorInfo {
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public:
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ErrLevel level;
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string name;
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string description;
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std::optional<NixCode> nixCode;
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std::optional<string> hint;
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ErrorInfo& GetEI() { return *this; }
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class ErrorInfo
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{
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public:
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ErrLevel level;
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string name;
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string description;
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std::optional<NixCode> nixCode;
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std::optional<string> hint;
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ErrorInfo& GetEI()
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{
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return *this;
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}
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static std::optional<string> programName;
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static std::optional<string> programName;
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// give these access to the private constructor,
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// when they are direct descendants (children but not grandchildren).
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friend AddName<ErrorInfo>;
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friend AddDescription<ErrorInfo>;
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friend AddNixCode<ErrorInfo>;
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friend AddNixFile<ErrorInfo>;
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friend AddErrLine<ErrorInfo>;
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friend AddLineNumber<ErrorInfo>;
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friend AddColumnRange<ErrorInfo>;
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friend AddLOC<ErrorInfo>;
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// give these access to the private constructor,
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// when they are direct descendants (children but not grandchildren).
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friend AddName<ErrorInfo>;
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friend AddDescription<ErrorInfo>;
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friend AddNixCode<ErrorInfo>;
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friend AddNixFile<ErrorInfo>;
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friend AddErrLine<ErrorInfo>;
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friend AddLineNumber<ErrorInfo>;
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friend AddColumnRange<ErrorInfo>;
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friend AddLOC<ErrorInfo>;
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NixCode& ensureNixCode()
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{
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if (!this->nixCode.has_value())
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this->nixCode = std::optional(NixCode());
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return *this->nixCode;
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}
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protected:
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// constructor is protected, so only the builder classes can create an ErrorInfo.
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ErrorInfo(ErrLevel level) { this->level = level; }
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NixCode& ensureNixCode()
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{
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if (!this->nixCode.has_value())
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this->nixCode = std::optional(NixCode());
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return *this->nixCode;
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}
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protected:
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// constructor is protected, so only the builder classes can create an ErrorInfo.
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ErrorInfo(ErrLevel level)
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{
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this->level = level;
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}
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};
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// Init as error
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class EIError : public ErrorInfo
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{
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protected:
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EIError() : ErrorInfo(elError) {}
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protected:
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EIError() : ErrorInfo(elError) {}
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};
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// Init as warning
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class EIWarning : public ErrorInfo
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{
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protected:
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EIWarning() : ErrorInfo(elWarning) {}
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protected:
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EIWarning() : ErrorInfo(elWarning) {}
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};
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// Builder class definitions.
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template <class T>
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class AddName : private T
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{
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public:
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T& name(const std::string &name){
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GetEI().name = name;
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return *this;
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}
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protected:
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ErrorInfo& GetEI() { return T::GetEI(); }
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public:
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T& name(const std::string &name)
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{
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GetEI().name = name;
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return *this;
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}
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protected:
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ErrorInfo& GetEI()
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{
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return T::GetEI();
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}
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};
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template <class T>
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class AddDescription : private T
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class AddDescription : private T
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{
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public:
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T& description(const std::string &description){
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GetEI().description = description;
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return *this;
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}
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protected:
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ErrorInfo& GetEI() { return T::GetEI(); }
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public:
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T& description(const std::string &description)
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{
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GetEI().description = description;
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return *this;
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}
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protected:
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ErrorInfo& GetEI()
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{
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return T::GetEI();
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}
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};
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template <class T>
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template <class T>
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class AddNixFile : private T
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{
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public:
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T& nixFile(string filename) {
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GetEI().ensureNixCode().nixFile = filename;
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return *this;
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}
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protected:
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ErrorInfo& GetEI() { return T::GetEI(); }
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public:
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T& nixFile(string filename)
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{
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GetEI().ensureNixCode().nixFile = filename;
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return *this;
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}
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protected:
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ErrorInfo& GetEI()
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{
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return T::GetEI();
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}
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};
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template <class T>
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template <class T>
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class AddLineNumber : private T
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{
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public:
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T& lineNumber(int lineNumber) {
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GetEI().ensureNixCode().ensureErrLine().lineNumber = lineNumber;
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return *this;
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}
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protected:
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ErrorInfo& GetEI() { return T::GetEI(); }
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public:
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T& lineNumber(int lineNumber)
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{
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GetEI().ensureNixCode().ensureErrLine().lineNumber = lineNumber;
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return *this;
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}
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protected:
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ErrorInfo& GetEI()
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{
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return T::GetEI();
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}
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};
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template <class T>
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template <class T>
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class AddColumnRange : private T
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{
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public:
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T& columnRange(unsigned int start, unsigned int len) {
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GetEI().ensureNixCode().ensureErrLine().columnRange = { start, len };
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return *this;
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}
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protected:
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ErrorInfo& GetEI() { return T::GetEI(); }
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public:
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T& columnRange(unsigned int start, unsigned int len)
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{
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GetEI().ensureNixCode().ensureErrLine().columnRange = { start, len };
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return *this;
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}
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protected:
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ErrorInfo& GetEI()
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{
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return T::GetEI();
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}
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};
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template <class T>
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template <class T>
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class AddLOC : private T
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{
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public:
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T& linesOfCode(std::optional<string> prevloc, string loc, std::optional<string> nextloc) {
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GetEI().ensureNixCode().ensureErrLine().prevLineOfCode = prevloc;
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GetEI().ensureNixCode().ensureErrLine().errLineOfCode = loc;
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GetEI().ensureNixCode().ensureErrLine().nextLineOfCode = nextloc;
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return *this;
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}
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protected:
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ErrorInfo& GetEI() { return T::GetEI(); }
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public:
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T& linesOfCode(std::optional<string> prevloc, string loc, std::optional<string> nextloc)
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{
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GetEI().ensureNixCode().ensureErrLine().prevLineOfCode = prevloc;
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GetEI().ensureNixCode().ensureErrLine().errLineOfCode = loc;
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GetEI().ensureNixCode().ensureErrLine().nextLineOfCode = nextloc;
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return *this;
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}
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protected:
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ErrorInfo& GetEI()
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{
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return T::GetEI();
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}
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};
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// ----------------------------------------------------------------
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// format for hints. same as boost format, except templated values
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// format for hints. same as boost format, except templated values
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// are always in yellow.
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template <class T>
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class yellowify
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{
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public:
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yellowify(T &s) : value(s) {}
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T &value;
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yellowify(T &s) : value(s) {}
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T &value;
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};
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template <class T>
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return out << ANSI_YELLOW << y.value << ANSI_NORMAL;
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}
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class hintfmt
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class hintfmt
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{
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public:
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hintfmt(string format) :fmt(format) {
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fmt.exceptions(boost::io::all_error_bits ^ boost::io::too_many_args_bit);
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}
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template<class T>
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hintfmt& operator%(const T &value) { fmt % yellowify(value); return *this; }
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public:
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hintfmt(string format) :fmt(format)
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{
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fmt.exceptions(boost::io::all_error_bits ^ boost::io::too_many_args_bit);
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}
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template<class T>
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hintfmt& operator%(const T &value)
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{
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fmt % yellowify(value);
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return *this;
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}
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template <typename U>
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friend class AddHint;
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private:
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format fmt;
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template <typename U>
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friend class AddHint;
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private:
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format fmt;
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};
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// the template layer for adding a hint.
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template <class T>
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template <class T>
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class AddHint : private T
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{
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public:
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T& hint(hintfmt &hfmt) {
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GetEI().hint = std::optional(hfmt.fmt.str());
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return *this;
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}
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T& nohint() {
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GetEI().hint = std::nullopt;
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return *this;
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}
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protected:
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ErrorInfo& GetEI() { return T::GetEI(); }
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public:
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T& hint(hintfmt &hfmt)
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{
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GetEI().hint = std::optional(hfmt.fmt.str());
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return *this;
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}
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T& nohint()
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{
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GetEI().hint = std::nullopt;
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return *this;
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}
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protected:
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ErrorInfo& GetEI()
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{
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return T::GetEI();
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}
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};
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// --------------------------------------------------------
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// error types
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typedef AddName<
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AddDescription<
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AddHint<
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EIError>>> ProgramError;
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AddDescription<
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AddHint<
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EIError>>> ProgramError;
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typedef AddName<
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AddDescription<
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AddHint<
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EIWarning>>> ProgramWarning;
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AddDescription<
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AddHint<
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EIWarning>>> ProgramWarning;
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typedef AddName<
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AddDescription<
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AddNixFile<
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AddLineNumber<
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AddColumnRange<
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AddLOC<
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AddHint<
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EIError>>>>>>> NixLangError;
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AddDescription<
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AddNixFile<
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AddLineNumber<
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AddColumnRange<
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AddLOC<
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AddHint<
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EIError>>>>>>> NixLangError;
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typedef AddName<
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AddDescription<
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AddNixFile<
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AddLineNumber<
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AddColumnRange<
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AddLOC<
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AddHint<
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EIWarning>>>>>>> NixLangWarning;
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AddDescription<
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AddNixFile<
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AddLineNumber<
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AddColumnRange<
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AddLOC<
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AddHint<
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EIWarning>>>>>>> NixLangWarning;
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// --------------------------------------------------------
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