497 lines
17 KiB
TeX
497 lines
17 KiB
TeX
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\section{\class{wxExpr}}\label{wxexpr}
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The {\bf wxExpr} class is the building brick of expressions similar to Prolog
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clauses, or objects. It can represent an expression of type long integer, float, string, word,
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or list, and lists can be nested.
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\wxheading{Derived from}
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None
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\wxheading{Include files}
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<wx/wxexpr.h>
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\wxheading{See also}
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\helpref{wxExpr overview}{exproverview}, \helpref{wxExprDatabase}{wxexprdatabase}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxExpr::wxExpr}\label{wxexprconstr}
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\func{}{wxExpr}{\param{const wxString\&}{functor}}
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Construct a new clause with this form, supplying the functor name. A clause is an object
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that will appear in the data file, with a list of attribute/value pairs.
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\func{}{wxExpr}{\param{wxExprType}{ type}, \param{const wxString\&}{ wordOrString = ``"}}
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Construct a new empty list, or a word (will be output with no quotes), or a string, depending on the
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value of {\it type}.
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{\it type} can be {\bf wxExprList}, {\bf wxExprWord}, or {\bf wxExprString}. If {\it type} is wxExprList,
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the value of {\it wordOrString} will be ignored.
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\func{}{wxExpr}{\param{long}{ value}}
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Construct an integer expression.
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\func{}{wxExpr}{\param{float}{ value}}
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Construct a floating point expression.
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\func{}{wxExpr}{\param{wxList* }{value}}
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Construct a list expression. The list's nodes' data should
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themselves be {\bf wxExpr}s.
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wxExpr no longer uses the {\bf wxList} internally,
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so this constructor turns the list into its internal
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format (assuming a non-nested list) and then deletes the supplied
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list.
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\membersection{wxExpr::\destruct{wxExpr}}
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\func{}{\destruct{wxExpr}}{\void}
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Destructor.
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\membersection{wxExpr::AddAttributeValue}\label{wxexpraddattributevalue}
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Use these on clauses ONLY. Note that the functions for adding strings
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and words must be differentiated by function name which is why
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they are missing from this group (see \helpref{wxExpr::AddAttributeValueString}{wxexpraddattributevaluestring} and
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\rtfsp\helpref{wxExpr::AddAttributeValueWord}{wxexpraddattributevalueword}).
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\func{void}{AddAttributeValue}{\param{const wxString\&}{ attribute}, \param{float }{value}}
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Adds an attribute and floating point value pair to the clause.
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\func{void}{AddAttributeValue}{\param{const wxString\&}{ attribute}, \param{long }{value}}
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Adds an attribute and long integer value pair to the clause.
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\func{void}{AddAttributeValue}{\param{const wxString\&}{ attribute}, \param{wxList* }{value}}
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Adds an attribute and list value pair to the clause, converting the list into
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internal form and then deleting {\bf value}. Note that the list should not contain
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nested lists (except if in internal {\bf wxExpr} form.)
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\func{void}{AddAttributeValue}{\param{const wxString\&}{ attribute}, \param{wxExpr* }{value}}
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Adds an attribute and wxExpr value pair to the clause. Do not delete\rtfsp
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{\it value} once this function has been called.
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\membersection{wxExpr::AddAttributeValueString}\label{wxexpraddattributevaluestring}
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\func{void}{AddAttributeValueString}{\param{const wxString\&}{ attribute}, \param{const wxString\&}{ value}}
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Adds an attribute and string value pair to the clause.
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\membersection{wxExpr::AddAttributeValueStringList}\label{wxexpraddattributevaluestringlist}
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\func{void}{AddAttributeValueStringList}{\param{const wxString\&}{ attribute}, \param{wxList* }{value}}
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Adds an attribute and string list value pair to the clause.
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Note that the list passed to this function is a list of strings, NOT a list
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of {\bf wxExpr}s; it gets turned into a list of {\bf wxExpr}s
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automatically. This is a convenience function, since lists of strings
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are often manipulated in C++.
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\membersection{wxExpr::AddAttributeValueWord}\label{wxexpraddattributevalueword}
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\func{void}{AddAttributeValueWord}{\param{const wxString\&}{ attribute}, \param{const wxString\&}{ value}}
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Adds an attribute and word value pair to the clause.
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\membersection{wxExpr::Append}\label{wxexprappend}
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\func{void}{Append}{\param{wxExpr*}{ value}}
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Append the {\bf value} to the end of the list. `this' must be a list.
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\membersection{wxExpr::Arg}\label{wxexprarg}
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\constfunc{wxExpr* }{Arg}{\param{wxExprType}{ type}, \param{int}{ n}}
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Get nth arg of the given clause (starting from 1). NULL is returned if
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the expression is not a clause, or {\it n} is invalid, or the given type
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does not match the actual type. See also \helpref{wxExpr::Nth}{wxexprnth}.
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\membersection{wxExpr::Insert}\label{wxexprinsert}
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\func{void}{Insert}{\param{wxExpr* }{value}}
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Insert the {\bf value} at the start of the list. `this' must be a list.
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\membersection{wxExpr::GetAttributeValue}\label{wxexprgetattributevalue}
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These functions are the easiest way to retrieve attribute values, by
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passing a pointer to variable. If the attribute is present, the
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variable will be filled with the appropriate value. If not, the
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existing value is left alone. This style of retrieving attributes
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makes it easy to set variables to default values before calling these
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functions; no code is necessary to check whether the attribute is
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present or not.
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\constfunc{bool}{GetAttributeValue}{\param{const wxString\&}{ attribute}, \param{wxString\&}{ value}}
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Retrieve a string (or word) value.
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\constfunc{bool}{GetAttributeValue}{\param{const wxString\&}{ attribute}, \param{float\& }{value}}
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Retrieve a floating point value.
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\constfunc{bool}{GetAttributeValue}{\param{const wxString\&}{ attribute}, \param{int\& }{value}}
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Retrieve an integer value.
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\constfunc{bool}{GetAttributeValue}{\param{const wxString\&}{ attribute}, \param{long\& }{value}}
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Retrieve a long integer value.
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\constfunc{bool}{GetAttributeValue}{\param{const wxString\&}{ attribute}, \param{wxExpr**}{ value}}
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Retrieve a wxExpr pointer.
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\membersection{wxExpr::GetAttributeValueStringList}\label{wxexprgetattributestringlist}
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\constfunc{void}{GetAttributeValueStringList}{\param{const wxString\&}{attribute}, \param{wxList* }{value}}
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Use this on clauses ONLY. See above for comments on this style of
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attribute value retrieval. This function expects to receive a pointer to
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a new list (created by the calling application); it will append strings
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to the list if the attribute is present in the clause.
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\membersection{wxExpr::AttributeValue}\label{wxexprattributevalue}
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\constfunc{wxExpr*}{AttributeValue}{\param{const wxString\&}{ word}}
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Use this on clauses ONLY. Searches the clause for an attribute
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matching {\it word}, and returns the value associated with it.
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\membersection{wxExpr::Copy}\label{wxexprcopy}
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\constfunc{wxExpr*}{Copy}{\void}
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Recursively copies the expression, allocating new storage space.
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\membersection{wxExpr::DeleteAttributeValue}\label{wxexprdeletattributevalue}
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\func{void}{DeleteAttributeValue}{\param{const wxString\&}{ attribute}}
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Use this on clauses only. Deletes the attribute and its value (if any) from the
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clause.
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\membersection{wxExpr::Functor}\label{wxexprfunctor}
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\constfunc{wxString}{Functor}{\void}
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Use this on clauses only. Returns the clause's functor (object name).
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\membersection{wxExpr::GetClientData}\label{wxexprgetclientdata}
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\constfunc{wxObject*}{GetClientData}{\void}
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Retrieve arbitrary data stored with this clause. This can be useful when
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reading in data for storing a pointer to the C++ object, so when another
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clause makes a reference to this clause, its C++ object can be retrieved.
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See \helpref{wxExpr::SetClientData}{wxexprsetclientdata}.
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\membersection{wxExpr::GetFirst}\label{wxexprgetfirst}
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\constfunc{wxExpr*}{GetFirst}{\void}
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If this is a list expression (or clause), gets the first element in the list.
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See also \helpref{wxExpr::GetLast}{wxexprgetlast}, \helpref{wxExpr::GetNext}{wxexprgetnext}, \helpref{wxExpr::Nth}{wxexprnth}.
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\membersection{wxExpr::GetLast}\label{wxexprgetlast}
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\constfunc{wxExpr*}{GetLast}{\void}
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If this is a list expression (or clause), gets the last element in the list.
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See also \helpref{wxExpr::GetFirst}{wxexprgetfirst}, \helpref{wxExpr::GetNext}{wxexprgetnext}, \helpref{wxExpr::Nth}{wxexprnth}.
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\membersection{wxExpr::GetNext}\label{wxexprgetnext}
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\constfunc{wxExpr*}{GetNext}{\void}
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If this is a node in a list (any wxExpr may be a node in a list), gets the
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next element in the list.
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See also \helpref{wxExpr::GetFirst}{wxexprgetfirst}, \helpref{wxExpr::GetLast}{wxexprgetlast}, \helpref{wxExpr::Nth}{wxexprnth}.
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\membersection{wxExpr::IntegerValue}\label{wxexprintegervalue}
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\constfunc{long}{IntegerValue}{\void}
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Returns the integer value of the expression.
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\membersection{wxExpr::Nth}\label{wxexprnth}
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\constfunc{wxExpr*}{Nth}{\param{int}{ n}}
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Get nth arg of the given list expression (starting from 0). NULL is returned if
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the expression is not a list expression, or {\it n} is invalid. See also \helpref{wxExpr::Arg}{wxexprarg}.
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Normally, you would use attribute-value pairs to add and retrieve data
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from objects (clauses) in a data file. However, if the data gets complex,
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you may need to store attribute values as lists, and pick them apart
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yourself.
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\membersection{wxExpr::RealValue}\label{wxexprrealvalue}
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\constfunc{float}{RealValue}{\void}
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Returns the floating point value of the expression.
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\membersection{wxExpr::SetClientData}\label{wxexprsetclientdata}
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\func{void}{SetClientData}{\param{wxObject *}{data}}
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Associate arbitrary data with this clause. This can be useful when
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reading in data for storing a pointer to the C++ object, so when another
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clause makes a reference to this clause, its C++ object can be retrieved.
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See \helpref{wxExpr::GetClientData}{wxexprgetclientdata}.
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\membersection{wxExpr::StringValue}\label{wxexprstringvalue}
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\constfunc{wxString}{StringValue}{\void}
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Returns the string value of the expression.
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\membersection{wxExpr::Type}\label{wxexprtype}
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\constfunc{wxExprType}{Type}{\void}
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Returns the type of the expression. {\bf wxExprType} is defined as follows:
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\begin{verbatim}
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typedef enum {
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wxExprNull,
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wxExprInteger,
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wxExprReal,
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wxExprWord,
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wxExprString,
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wxExprList
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} wxExprType;
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\end{verbatim}
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\membersection{wxExpr::WordValue}\label{wxexprwordvalue}
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\constfunc{wxString}{WordValue}{\void}
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Returns the word value of the expression.
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\membersection{wxExpr::WriteClause}\label{wxexprwriteprologclause}
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\func{void}{WriteClause}{\param{FILE *}{ stream}}
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Writes the clause to the given stream in Prolog format. Not normally needed, since
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the whole {\bf wxExprDatabase} will usually be written at once. The format is:
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functor, open parenthesis, list of comma-separated expressions, close parenthesis,
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full stop.
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\membersection{wxExpr::WriteExpr}\label{wxexprwriteexpr}
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\func{void}{WriteExpr}{\param{FILE *}{ stream}}
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Writes the expression (not clause) to the given stream in Prolog
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format. Not normally needed, since the whole {\bf wxExprDatabase} will
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usually be written at once. Lists are written in square bracketed,
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comma-delimited format.
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\membersection{Functions and macros}
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Below are miscellaneous functions and macros associated with wxExpr objects.
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\func{bool}{wxExprIsFunctor}{\param{wxExpr *}{expr}, \param{const wxString\&}{ functor}}
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Checks that the functor of {\it expr} is {\it functor}.
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\func{void}{wxExprCleanUp}{\void}
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Cleans up the wxExpr system (YACC/LEX buffers) to avoid memory-checking warnings as the program exits.
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\begin{verbatim}
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#define wxMakeInteger(x) (new wxExpr((long)x))
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#define wxMakeReal(x) (new wxExpr((float)x))
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#define wxMakeString(x) (new wxExpr(PrologString, x))
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#define wxMakeWord(x) (new wxExpr(PrologWord, x))
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#define wxMake(x) (new wxExpr(x))
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\end{verbatim}
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Macros to help make wxExpr objects.
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\section{\class{wxExprDatabase}}\label{wxexprdatabase}
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The {\bf wxExprDatabase} class represents a database, or list,
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of Prolog-like expressions. Instances of this class are used for reading,
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writing and creating data files.
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\wxheading{Derived from}
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\helpref{wxList}{wxlist}\\
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\helpref{wxObject}{wxobject}
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\wxheading{See also}
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\helpref{wxExpr overview}{exproverview}, \helpref{wxExpr}{wxexpr}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxExprDatabase::wxExprDatabase}\label{wxexprdatabaseconstr}
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\func{void}{wxExprDatabase}{\param{proioErrorHandler}{ handler = 0}}
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Construct a new, unhashed database, with an optional error handler. The
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error handler must be a function returning a bool and taking an integer and a string
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argument. When an error occurs when reading or writing a database, this function is
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called. The error is given as the first argument (currently one of WXEXPR\_ERROR\_GENERAL,
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WXEXPR\_ERROR\_SYNTAX) and an error message is given as the second argument. If false
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is returned by the error handler, processing of the wxExpr operation stops.
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Another way of handling errors is simply to call \helpref{wxExprDatabase::GetErrorCount}{wxexprdatabasegeterrorcount} after
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the operation, to check whether errors have occurred, instead of installing an error handler.
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If the error count is more than zero, \helpref{wxExprDatabase::Write}{wxexprdatabasewrite} and
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\rtfsp\helpref{wxExprDatabase::Read}{wxexprdatabaseread} will return false to
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the application.
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For example:
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\begin{verbatim}
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bool myErrorHandler(int err, chat *msg)
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{
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if (err == WXEXPR_ERROR_SYNTAX)
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{
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wxMessageBox(msg, "Syntax error");
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}
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return false;
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}
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wxExprDatabase database(myErrorHandler);
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\end{verbatim}
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\func{}{wxExprDatabase}{\param{wxExprType}{ type}, \param{const wxString\&}{attribute},
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\rtfsp\param{int}{ size = 500}, \param{proioErrorHandler}{ handler = 0}}
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Construct a new database hashed on a combination of the clause functor and
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a named attribute (often an integer identification).
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See above for an explanation of the error handler.
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\membersection{wxExprDatabase::\destruct{wxExprDatabase}}
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\func{}{\destruct{wxExprDatabase}}{\void}
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Delete the database and contents.
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\membersection{wxExprDatabase::Append}\label{wxexprdatabaseappend}
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\func{void}{Append}{\param{wxExpr* }{clause}}
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Append a clause to the end of the database. If the database is hashing,
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the functor and a user-specified attribute will be hashed upon, giving the
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option of random access in addition to linear traversal of the database.
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\membersection{wxExprDatabase::BeginFind}\label{wxexprdatabasebeginfind}
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\func{void}{BeginFind}{\void}
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Reset the current position to the start of the database. Subsequent
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\rtfsp\helpref{wxExprDatabase::FindClause}{wxexprdatabasefindclause} calls will move the pointer.
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\membersection{wxExprDatabase::ClearDatabase}\label{wxexprdatabasecleardatabase}
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\func{void}{ClearDatabase}{\void}
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Clears the contents of the database.
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\membersection{wxExprDatabase::FindClause}\label{wxexprdatabasefindclause}
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Various ways of retrieving clauses from the database. A return
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value of NULL indicates no (more) clauses matching the given criteria.
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Calling the functions repeatedly retrieves more matching clauses, if any.
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\func{wxExpr* }{FindClause}{\param{long}{ id}}
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Find a clause based on the special ``id'' attribute.
|
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\func{wxExpr* }{FindClause}{\param{const wxString\&}{ attribute}, \param{const wxString\&}{ value}}
|
||
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Find a clause which has the given attribute set to the given string or word value.
|
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\func{wxExpr*}{FindClause}{\param{const wxString\&}{ attribute}, \param{long}{ value}}
|
||
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Find a clause which has the given attribute set to the given integer value.
|
||
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||
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\func{wxExpr*}{FindClause}{\param{const wxString\&}{ attribute}, \param{float}{ value}}
|
||
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|
||
|
Find a clause which has the given attribute set to the given floating point value.
|
||
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||
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\membersection{wxExprDatabase::FindClauseByFunctor}\label{wxexprdatabasefindclausebyfunctor}
|
||
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|
||
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\func{wxExpr*}{FindClauseByFunctor}{\param{const wxString\&}{ functor}}
|
||
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|
||
|
Find the next clause with the specified functor.
|
||
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|
||
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\membersection{wxExprDatabase::GetErrorCount}\label{wxexprdatabasegeterrorcount}
|
||
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|
||
|
\constfunc{int}{GetErrorCount}{\void}
|
||
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|
||
|
Returns the number of errors encountered during the last read or write operation.
|
||
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|
||
|
\membersection{wxExprDatabase::HashFind}\label{wxexprdatabasehashfind}
|
||
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|
||
|
\constfunc{wxExpr*}{HashFind}{\param{const wxString\&}{ functor}, \param{long}{ value}}
|
||
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|
||
|
Finds the clause with the given functor and with the attribute specified
|
||
|
in the database constructor having the given integer value.
|
||
|
|
||
|
For example,
|
||
|
|
||
|
\begin{verbatim}
|
||
|
// Hash on a combination of functor and integer "id" attribute when reading in
|
||
|
wxExprDatabase db(wxExprInteger, "id");
|
||
|
|
||
|
// Read it in
|
||
|
db.ReadProlog("data");
|
||
|
|
||
|
// Retrieve a clause with specified functor and id
|
||
|
wxExpr *clause = db.HashFind("node", 24);
|
||
|
\end{verbatim}
|
||
|
|
||
|
This would retrieve a clause which is written: {\tt node(id = 24, ..., )}.
|
||
|
|
||
|
\func{wxExpr*}{HashFind}{\param{const wxString\&}{ functor}, \param{const wxString\&}{ value}}
|
||
|
|
||
|
Finds the clause with the given functor and with the attribute specified
|
||
|
in the database constructor having the given string value.
|
||
|
|
||
|
\membersection{wxExprDatabase::Read}\label{wxexprdatabaseread}
|
||
|
|
||
|
\func{bool}{Read}{\param{const wxString\&}{ filename}}
|
||
|
|
||
|
Reads in the given file, returning true if successful.
|
||
|
|
||
|
\membersection{wxExprDatabase::ReadFromString}\label{wxexprdatabasereadfromstring}
|
||
|
|
||
|
\func{bool}{ReadFromString}{\param{const wxString\&}{ buffer}}
|
||
|
|
||
|
Reads a Prolog database from the given string buffer, returning true if
|
||
|
successful.
|
||
|
|
||
|
\membersection{wxExprDatabase::Write}\label{wxexprdatabasewrite}
|
||
|
|
||
|
\func{bool}{Write}{\param{FILE *}{stream}}
|
||
|
|
||
|
\func{bool}{Write}{\param{const wxString\&}{ filename}}
|
||
|
|
||
|
Writes the database as a Prolog-format file.
|
||
|
|
||
|
|