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251 lines
9.7 KiB
C++
251 lines
9.7 KiB
C++
/*
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*****************************************************************************************
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* *
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* COPYRIGHT: *
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* (C) Copyright Taligent, Inc., 1997 *
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* (C) Copyright International Business Machines Corporation, 1997 *
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* Licensed Material - Program-Property of IBM - All Rights Reserved. *
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* US Government Users Restricted Rights - Use, duplication, or disclosure *
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* restricted by GSA ADP Schedule Contract with IBM Corp. *
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* *
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*****************************************************************************************
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*
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* File READERS.H
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*
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* Contains support classes for the resource-bundle code
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* This file contains a group of support classes that are used by the resource-bundle code.
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* These classes are as follows:
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* UnicodeStreamReader - A small wrapper class around istream that allows it to read either ASCII
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* or Unicode data.
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* UnicodeStreamWriter - A small wrapper class around ostream that allows it to write Unicode data
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* ResourceFormatReader - A class that parses the low-level special characters in our resource
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* definition file format
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*
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* @author Richard Gillam
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*
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* Modification History:
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*
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* Date Name Description
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* 3/4/97 aliu Modified to support more efficient DataSink class as
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* an alternative to ostream objects.
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* 3/13/97 aliu Added getNextToken() and supporting methods to enable
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* tokenization and parsing of file from front to back.
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* 3/18/97 aliu Changed getNextToken() to getSingleToken() and wrote
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* a new getNextToken() which merges adjacent strings.
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* 3/20/97 aliu Removed obsolete classes to read tagged and comma-
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* delimited lists (now handled by getNextToken()), and
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* commented out unused classes UnicodeStreamWriter and
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* UnicodeDataSinkWriter.
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* 3/25/97 aliu Cleaned up code.
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*
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*****************************************************************************************
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*/
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#ifndef _READERS
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#define _READERS
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#ifndef _PTYPES
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#include "ptypes.h"
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#endif
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//#include "datasink.h"
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#include <stdio.h>
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class UnicodeString;
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enum {
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kNoErr = 0,
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kEofOnRead,
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kEofOnWrite,
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kItemNotFound
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};
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//========================================================================================
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// UnicodeStreamReader
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//========================================================================================
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/** Wrapper around istream for reading Unicode data
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* This class wraps an istream and allows us to read Unicode character data. The stream
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* may actually be in either ASCII or Unicode format, but this class always returns
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* Unicode characters. The caller can pass the following values for "format":
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* kASCII - Incoming data is ASCII; zero-pad everything out to 16 bits to get Unicode
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* kBigEndianUnicode - Incoming data is Unicode, and the most significant byte
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* of each character comes first
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* kLittleEndianUnicode - Incoming data is Unicode, and the least significant byte
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* of each character comes first
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* kAuto - Infer the character format from the incoming data. This relies on the
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* "official" Unicode text file format: A file containing Unicode starts with the
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* Unicode byte order mark ($FEFF). If we read something else, the file is assumed to
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* be ASCII. If it's $FEFF or $FFFE, we know it's Unicode and can infer the byte
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* ordering we need to use.
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* kDefault - Incoming data is Unicode, and whatever byte ordering the system we're
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* running on uses internally is the byte ordering we're using (used for memory streams).
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*/
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#ifdef NLS_MAC
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#pragma export on
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#endif
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class UnicodeStreamReader {
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public:
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enum CharFormat {
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kASCII,
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kBigEndianUnicode,
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kLittleEndianUnicode,
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kAuto,
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kDefault
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};
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UnicodeStreamReader( FILE* stream,
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CharFormat format);
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~UnicodeStreamReader();
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void reset();
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UniChar get(short& err);
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void putback(UniChar theChar,
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short err = kNoErr);
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enum Endian {
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kBig,
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kLittle,
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kUnknown
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};
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protected:
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static Endian fgEndian;
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private:
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static void determineEndianism();
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FILE* fStream;
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CharFormat fFormat;
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UniChar fPutback;
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};
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//========================================================================================
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// ResourceFormatReader
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//========================================================================================
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/**
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* Class for reading information from a file in our resource-definition format.
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* This takes care of interpreting (and when necessary disregarding) the extra stuff
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* we allow people to put into the file to make it human-readable. The special characters
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* we allow in resource files are as follows:
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* / * Begins a comment, which is terminated by * / (The spaces in these tokens aren't
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* really there; I inserted them to keep the C++ compiler from seeing them as
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* comment delimiters itself; this is standard C++/Java comment syntax). These
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* comments do not nest.
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* // Begins a comment that terminates at the end of the line.
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* " begins and ends a quoted string. Within a quoted string characters that would
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* otherwise have special meaning (except for backslash escape sequences) don't.
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* \ Begins an escape sequence. The following escape sequences are possible:
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* \n Line feed
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* \t Tab
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* \x## ASCII (Latin1) character. May be followed by one or two hex digits that
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* specify the actual character value (if there are no hex digits, or if
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* the value would be 0, the \x sequence is ignored)
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* \u#### Unicode character. May be followed by up to four hex digits that specify
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* the actual character value (if there are no hex digits, or if the value
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* would be 0, the \u sequence is ignored)
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* \ Backslash before any other character deprives that character of a special
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* meaning, if it had a special meaning. Thus, \\ represents a backslash,
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* and \" can be used to put a quote into a quoted string.
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* In addition, whitespace characters (spaces, tabs, line feeds, carriage returns, and
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* Unicode paragraph separators) are ignored, unless they occur within quoted strings.
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* Adjacent string literals are merged together, with a single interveing space, unless
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* both are quoted strings, in which case no space is added between them.
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*/
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class ResourceFormatReader {
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public:
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ResourceFormatReader( FILE* stream,
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UnicodeStreamReader::CharFormat format);
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~ResourceFormatReader();
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/**
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* The types of tokens which may be returned by getNextToken.
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*/
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enum ETokenType
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{
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kString, // A string token, such as "MonthNames"
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kOpenBrace, // An opening brace character
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kCloseBrace, // A closing brace character
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kComma, // A comma
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kEOF, // End of the file has been reached successfully
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kError, // An error, such an unterminated quoted string
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kTokenTypeCount = 4 // Number of "real" token types
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};
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/**
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* Read and return the next token from the stream. If the token is
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* of type kString, fill in the stringToken parameter with the
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* token. If the token is kError, then the err parameter will contain
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* the specific error. This will be kItemNotFound at the end of file,
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* indicating that all tokens have been returned. This method will
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* never return kString twice in a row; instead, multiple adjacent string
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* tokens will be merged into one, with a single intervening space, unless
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* both token are quoted strings, in which case no intervening space is
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* added.
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*
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* @param stringToken Fill in parameter to receive value of string
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* token, if the return value is kString.
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* @param err Fill in parameter to receive error code,
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* if the return value is kError. After the
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* last token is returned, this will be set to
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* kItemNotFound, and kError will be returned.
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* Any other value indicates an abnormal error.
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* @return The type of the next token. This will be either
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* kString, kOpenBrace, kCloseBrace, kComma, or
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* kError. It will never be kNull.
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*/
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ETokenType getNextToken( UnicodeString& stringToken,
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short& err);
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/**
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* Reset to the start of the input stream. After calling this method,
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* the next call to getNextToken() will return the first token in the
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* stream (if there is one).
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*/
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void reset();
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protected:
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/**
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* Retrieve the next character, ignoring comments. If skipwhite is true,
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* whitespace is skipped as well.
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*/
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UniChar getNextChar(t_bool skipwhite, short& err);
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ETokenType getStringToken(UniChar initialChar,
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UnicodeString& stringToken,
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short& err);
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void seekUntilNewline(short& err);
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void seekUntilEndOfComment(short& err);
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UniChar convertEscapeSequence(short& err);
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static t_bool isWhitespace(UniChar c);
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static t_bool isNewline(UniChar c);
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static t_bool isHexDigit(UniChar c);
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// Special characters we recognize during processing
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static const UniChar kOPENBRACE;
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static const UniChar kCLOSEBRACE;
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static const UniChar kCOMMA;
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static const UniChar kQUOTE;
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static const UniChar kESCAPE;
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static const UniChar kSLASH;
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static const UniChar kASTERISK;
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static const UniChar kSPACE;
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UnicodeStreamReader fReader;
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};
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#ifdef NLS_MAC
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#pragma export off
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#endif
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#endif
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