141 lines
5.5 KiB
C++
141 lines
5.5 KiB
C++
#ifndef cwLex_H
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#define cwLex_H
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//( { file_desc:"User configurable lexer for tokenizing text files." kw:[text]}
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namespace cw
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{
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namespace lex
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{
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// Predefined Lexer Id's
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enum
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{
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kErrorLexTId, // 0 the lexer was unable to identify the current token
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kUnknownLexTId, // 1 the token is of an unknown type (only used when kReturnUnknownLexFl is set)
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kEofLexTId, // 2 the lexer reached the end of input
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kSpaceLexTId, // 3 white space
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kRealLexTId, // 4 real number (contains a decimal point or is in scientific notation)
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kIntLexTId, // 5 decimal integer
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kHexLexTId, // 6 hexidecimal integer
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kIdentLexTId, // 7 identifier
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kQStrLexTId, // 8 quoted string
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kQCharLexTId, // 9 quoted char
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kBlockCmtLexTId, // 10 block comment
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kLineCmtLexTId, // 11 line comment
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kUserLexTId // 12 user registered token (See lexRegisterToken().)
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};
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// Lexer control flags used with lexInit().
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enum
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{
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kReturnSpaceLexFl = 0x01, //< Return space tokens
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kReturnCommentsLexFl = 0x02, //< Return comment tokens
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kReturnUnknownLexFl = 0x04, //< Return unknown tokens
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kReturnQCharLexFl = 0x08, //< Return quoted characters
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kUserDefPriorityLexFl= 0x10 //< User defined tokens take priority even if a kIdentLexTId token has a longer match
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};
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typedef handle<struct lex_str> handle_t;
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// Iniitalize the lexer and receive a lexer handle in return.
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// Set cp to nullptr if the buffer will be later via lexSetTextBuffer();
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// See the kXXXLexFl enum's above for possible flag values.
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rc_t create( handle_t& hRef, const char* cp, unsigned cn, unsigned flags );
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// Finalize a lexer created by an earlier call to lexInit()
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rc_t destroy( handle_t& hRef );
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// Rewind the lexer to the begining of the buffer (the same as post initialize state)
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rc_t reset( handle_t h );
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// Verify that a lexer handle is valid
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bool isValid( handle_t h );
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// Set a new text buffer and reset the lexer to the post initialize state.
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rc_t setTextBuffer( handle_t h, const char* cp, unsigned cn );
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rc_t setFile( handle_t h, const char* fn );
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// Register a user defined token. The id of the first user defined token should be
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// kUserLexTId+1. Neither the id or token text can be used by a previously registered
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// or built-in token.
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rc_t registerToken( handle_t h, unsigned id, const char* token );
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// Register a user defined token recognition function. This function should return the count
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// of initial, consecutive, characters in 'cp[cn]' which match its token pattern.
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typedef unsigned (*lexUserMatcherPtr_t)( const char* cp, unsigned cn );
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rc_t registerMatcher( handle_t h, unsigned id, lexUserMatcherPtr_t funcPtr );
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// Enable or disable the specified token type.
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rc_t enableToken( handle_t h, unsigned id, bool enableFl );
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// Get and set the lexer filter flags kReturnXXXLexFl.
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// These flags can be safely enabled and disabled between
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// calls to lexGetNextToken().
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unsigned filterFlags( handle_t h );
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void setFilterFlags( handle_t h, unsigned flags );
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// Return the type id of the current token and advances to the next token
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unsigned getNextToken( handle_t h );
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// Return the type id associated with the current token. This is the same value
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// returned by the previous call to lexGetNextToken().
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unsigned tokenId( handle_t h );
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// Return a pointer to the first character of text associated with the
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// current token. The returned pointer directly references the text contained
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// in the buffer given to the lexer in the call to lexInit(). The string
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// is therefore not zero terminated. Use lexTokenCharCount() to get the
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// length of the token string.
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const char* tokenText( handle_t h );
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// Return the count of characters in the text associated with the current token.
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// This is the only way to get this count since the string returned by
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// lexTokenText() is not zero terminated.
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unsigned tokenCharCount( handle_t h );
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// Return the value of the current token as an integer.
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int tokenInt( handle_t h );
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// Return the value of the current token as an unsigned integer.
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unsigned tokenUInt( handle_t h );
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// Return the value of the current token as a float.
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float tokenFloat( handle_t h );
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// Return the value of the current token as a double.
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double tokenDouble( handle_t h );
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// Return true if the current token is an int and it was suffixed
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// with 'u' to indicate that it is unsigned.
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bool tokenIsUnsigned( handle_t h );
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// Return true if the current token is a real and it was suffexed
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// with 'f' to indicate that it is a single precision float.
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bool tokenIsSinglePrecision( handle_t h );
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// Return the line number associated with the current token
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unsigned currentLineNumber( handle_t h );
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// Return the starting column of the current token
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unsigned currentColumnNumber( handle_t h );
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// Return the RC code associated with the last error
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unsigned errorRC( handle_t h );
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// Return the label associated with a token id
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const char* idToLabel( handle_t h, unsigned typeId );
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// Lexer testing stub.
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rc_t test( );
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}
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}
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//)
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#endif
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