420 lines
11 KiB
C
420 lines
11 KiB
C
/*
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*******************************************************************************
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*
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* Copyright (C) 1998-2000, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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*
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* File read.c
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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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* 05/26/99 stephen Creation.
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* 5/10/01 Ram removed ustdio dependency
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*******************************************************************************
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*/
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#include "read.h"
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#include "error.h"
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#include "unicode/ustring.h"
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#define OPENBRACE 0x007B
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#define CLOSEBRACE 0x007D
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#define COMMA 0x002C
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#define QUOTE 0x0022
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#define ESCAPE 0x005C
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#define SLASH 0x002F
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#define ASTERISK 0x002A
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#define SPACE 0x0020
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#define COLON 0x003A
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#define BADBOM 0xFFFE
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static int32_t lineCount;
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/* Protos */
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static enum ETokenType getStringToken(UCHARBUF *buf,
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UChar32 initialChar,
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struct UString *token,
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UErrorCode *status);
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static UChar32 getNextChar (UCHARBUF *buf, UBool skipwhite, UErrorCode *status);
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static void seekUntilNewline (UCHARBUF *buf, UErrorCode *status);
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static void seekUntilEndOfComment (UCHARBUF *buf, UErrorCode *status);
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static UBool isWhitespace (UChar32 c);
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static UBool isNewline (UChar32 c);
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void resetLineNumber() {
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lineCount = 1;
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}
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/* Read and return the next token from the stream. If the token is of
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type eString, fill in the token parameter with the token. If the
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token is eError, then the status parameter will contain the
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specific error. This will be eItemNotFound 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 eString twice in a row; instead, multiple adjacent
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string tokens will be merged into one, with no intervening
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space. */
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enum ETokenType getNextToken(UCHARBUF* buf,
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struct UString *token,
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uint32_t *linenumber, /* out: linenumber of token */
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UErrorCode *status) {
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enum ETokenType result;
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UChar32 c;
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if (U_FAILURE(*status)) {
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return TOK_ERROR;
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}
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/* Skip whitespace */
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c = getNextChar(buf, TRUE, status);
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if (U_FAILURE(*status)) {
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return TOK_ERROR;
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}
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*linenumber = lineCount;
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switch(c) {
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case BADBOM:
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return TOK_ERROR;
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case OPENBRACE:
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return TOK_OPEN_BRACE;
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case CLOSEBRACE:
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return TOK_CLOSE_BRACE;
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case COMMA:
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return TOK_COMMA;
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case U_EOF:
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return TOK_EOF;
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case COLON:
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return TOK_COLON;
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default:
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result = getStringToken(buf, c, token, status);
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}
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*linenumber = lineCount;
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return result;
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}
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/* Copy a string token into the given UnicodeString. Upon entry, we
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have already read the first character of the string token, which is
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not a whitespace character (but may be a QUOTE or ESCAPE). This
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function reads all subsequent characters that belong with this
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string, and copy them into the token parameter. The other
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important, and slightly convoluted purpose of this function is to
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merge adjacent strings. It looks forward a bit, and if the next
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non comment, non whitespace item is a string, it reads it in as
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well. If two adjacent strings are quoted, they are merged without
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intervening space. Otherwise a single SPACE character is
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inserted. */
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static enum ETokenType getStringToken(UCHARBUF* buf,
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UChar32 initialChar,
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struct UString *token,
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UErrorCode *status) {
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UBool lastStringWasQuoted;
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UChar32 c;
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UChar target[3] = { '\0' };
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UChar *pTarget = target;
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int len=0;
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UBool isFollowingCharEscaped=FALSE;
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/* We are guaranteed on entry that initialChar is not a whitespace
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character. If we are at the EOF, or have some other problem, it
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doesn't matter; we still want to validly return the initialChar
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(if nothing else) as a string token. */
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if (U_FAILURE(*status)) {
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return TOK_ERROR;
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}
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/* setup */
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lastStringWasQuoted = FALSE;
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c = initialChar;
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ustr_setlen(token, 0, status);
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if (U_FAILURE(*status)) {
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return TOK_ERROR;
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}
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for (;;) {
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if (c == QUOTE) {
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if (!lastStringWasQuoted && token->fLength > 0) {
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ustr_ucat(token, SPACE, status);
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if (U_FAILURE(*status)) {
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return TOK_ERROR;
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}
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}
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lastStringWasQuoted = TRUE;
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for (;;) {
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c = ucbuf_getc(buf,status);
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/* EOF reached */
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if (c == U_EOF) {
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return TOK_EOF;
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}
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/* Unterminated quoted strings */
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if (U_FAILURE(*status)) {
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return TOK_ERROR;
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}
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if (c == QUOTE && !isFollowingCharEscaped) {
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break;
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}
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if (c == ESCAPE) {
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pTarget = target;
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c = unescape(buf, status);
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if (c == U_ERR) {
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return TOK_ERROR;
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}
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}
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if(c==ESCAPE && !isFollowingCharEscaped){
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isFollowingCharEscaped = TRUE;
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}else{
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U_APPEND_CHAR32(c, pTarget,len);
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pTarget = target;
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ustr_uscat(token, pTarget,len, status);
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isFollowingCharEscaped = FALSE;
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len=0;
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}
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if (U_FAILURE(*status)) {
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return TOK_ERROR;
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}
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}
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} else {
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if (token->fLength > 0) {
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ustr_ucat(token, SPACE, status);
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if (U_FAILURE(*status)) {
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return TOK_ERROR;
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}
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}
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lastStringWasQuoted = FALSE;
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if (c == ESCAPE) {
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pTarget = target;
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c = unescape(buf, status);
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/* EOF reached */
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if (c == U_EOF) {
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return TOK_ERROR;
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}
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}
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U_APPEND_CHAR32(c, pTarget,len);
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pTarget = target;
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ustr_uscat(token, pTarget,len, status);
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len=0;
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if (U_FAILURE(*status)) {
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return TOK_ERROR;
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}
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for (;;) {
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/* DON'T skip whitespace */
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c = getNextChar(buf, FALSE, status);
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/* EOF reached */
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if (c == U_EOF) {
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ucbuf_ungetc(c, buf);
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return TOK_STRING;
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}
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if (U_FAILURE(*status)) {
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return TOK_STRING;
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}
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if (c == QUOTE
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|| c == OPENBRACE
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|| c == CLOSEBRACE
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|| c == COMMA
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|| c == COLON) {
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ucbuf_ungetc(c, buf);
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break;
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}
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if (isWhitespace(c)) {
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break;
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}
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if (c == ESCAPE) {
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pTarget = target;
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c = unescape(buf, status);
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if (c == U_ERR) {
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return TOK_ERROR;
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}
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}
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U_APPEND_CHAR32(c, pTarget,len);
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pTarget = target;
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ustr_uscat(token, pTarget,len, status);
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len=0;
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if (U_FAILURE(*status)) {
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return TOK_ERROR;
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}
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}
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}
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/* DO skip whitespace */
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c = getNextChar(buf, TRUE, status);
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if (U_FAILURE(*status)) {
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return TOK_STRING;
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}
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if (c == OPENBRACE || c == CLOSEBRACE || c == COMMA || c == COLON) {
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ucbuf_ungetc(c, buf);
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return TOK_STRING;
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}
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}
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}
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/* Retrieve the next character, ignoring comments. If skipwhite is
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true, whitespace is skipped as well. */
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static UChar32 getNextChar(UCHARBUF* buf,
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UBool skipwhite,
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UErrorCode *status) {
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UChar32 c;
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if (U_FAILURE(*status)) {
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return U_EOF;
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}
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for (;;) {
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c = ucbuf_getc(buf,status);
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if (c == U_EOF) {
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return U_EOF;
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}
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if (skipwhite && isWhitespace(c)) {
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continue;
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}
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/* This also handles the get() failing case */
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if (c != SLASH) {
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return c;
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}
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c = ucbuf_getc(buf,status);
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if (c == U_EOF) {
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return U_EOF;
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}
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switch (c) {
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case SLASH:
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seekUntilNewline(buf, status);
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break;
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case ASTERISK:
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seekUntilEndOfComment(buf, status);
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break;
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default:
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ucbuf_ungetc(c, buf);
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/* If get() failed this is a NOP */
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return SLASH;
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}
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}
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}
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static void seekUntilNewline(UCHARBUF* buf,
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UErrorCode *status) {
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UChar32 c;
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if (U_FAILURE(*status)) {
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return;
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}
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do {
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c = ucbuf_getc(buf,status);
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} while (!isNewline(c) && c != U_EOF && *status == U_ZERO_ERROR);
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}
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static void seekUntilEndOfComment(UCHARBUF *buf,
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UErrorCode *status) {
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UChar32 c, d;
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uint32_t line;
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if (U_FAILURE(*status)) {
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return;
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}
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line = lineCount;
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do {
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c = ucbuf_getc(buf, status);
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if (c == ASTERISK) {
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d = ucbuf_getc(buf, status);
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if (d != SLASH) {
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ucbuf_ungetc(d, buf);
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} else {
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break;
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}
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}
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} while (c != U_EOF && *status == U_ZERO_ERROR);
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if (c == U_EOF) {
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*status = U_INVALID_FORMAT_ERROR;
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error(line, "unterminated comment detected");
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}
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}
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UChar32 unescape(UCHARBUF *buf,
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UErrorCode *status) {
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if (U_FAILURE(*status)) {
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return U_EOF;
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}
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/* We expect to be called after the ESCAPE has been seen, but
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* u_fgetcx needs an ESCAPE to do its magic. */
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ucbuf_ungetc(ESCAPE, buf);
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return ucbuf_getcx(buf, status);
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}
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static UBool isWhitespace(UChar32 c) {
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switch (c) {
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/* ' ', '\t', '\n', '\r', 0x2029, 0xFEFF */
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case 0x000A:
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case 0x2029:
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lineCount++;
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case 0x000D:
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case 0x0020:
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case 0x0009:
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case 0xFEFF:
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return TRUE;
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default:
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return FALSE;
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}
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}
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static UBool isNewline(UChar32 c) {
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switch (c) {
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/* '\n', '\r', 0x2029 */
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case 0x000A:
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case 0x2029:
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lineCount++;
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case 0x000D:
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return TRUE;
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default:
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return FALSE;
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}
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}
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