// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*
* Copyright (C) 1998-2012, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
*
* File read.c
*
* Modification History:
*
* Date Name Description
* 05/26/99 stephen Creation.
* 5/10/01 Ram removed ustdio dependency
*******************************************************************************
*/
#include "read.h"
#include "errmsg.h"
#include "unicode/ustring.h"
#include "unicode/utf16.h"
#define OPENBRACE 0x007B
#define CLOSEBRACE 0x007D
#define COMMA 0x002C
#define QUOTE 0x0022
#define ESCAPE 0x005C
#define SLASH 0x002F
#define ASTERISK 0x002A
#define SPACE 0x0020
#define COLON 0x003A
#define BADBOM 0xFFFE
#define CR 0x000D
#define LF 0x000A
static int32_t lineCount;
/* Protos */
static enum ETokenType getStringToken(UCHARBUF *buf,
UChar32 initialChar,
struct UString *token,
UErrorCode *status);
static UChar32 getNextChar (UCHARBUF *buf, UBool skipwhite, struct UString *token, UErrorCode *status);
static void seekUntilNewline (UCHARBUF *buf, struct UString *token, UErrorCode *status);
static void seekUntilEndOfComment (UCHARBUF *buf, struct UString *token, UErrorCode *status);
static UBool isWhitespace (UChar32 c);
static UBool isNewline (UChar32 c);
U_CFUNC void resetLineNumber() {
lineCount = 1;
}
/* Read and return the next token from the stream. If the token is of
type eString, fill in the token parameter with the token. If the
token is eError, then the status parameter will contain the
specific error. This will be eItemNotFound at the end of file,
indicating that all tokens have been returned. This method will
never return eString twice in a row; instead, multiple adjacent
string tokens will be merged into one, with no intervening
space. */
U_CFUNC enum ETokenType
getNextToken(UCHARBUF* buf,
struct UString *token,
uint32_t *linenumber, /* out: linenumber of token */
struct UString *comment,
UErrorCode *status) {
enum ETokenType result;
UChar32 c;
if (U_FAILURE(*status)) {
return TOK_ERROR;
}
/* Skip whitespace */
c = getNextChar(buf, TRUE, comment, status);
if (U_FAILURE(*status)) {
return TOK_ERROR;
}
*linenumber = lineCount;
switch(c) {
case BADBOM:
return TOK_ERROR;
case OPENBRACE:
return TOK_OPEN_BRACE;
case CLOSEBRACE:
return TOK_CLOSE_BRACE;
case COMMA:
return TOK_COMMA;
case U_EOF:
return TOK_EOF;
case COLON:
return TOK_COLON;
default:
result = getStringToken(buf, c, token, status);
}
*linenumber = lineCount;
return result;
}
/* Copy a string token into the given UnicodeString. Upon entry, we
have already read the first character of the string token, which is
not a whitespace character (but may be a QUOTE or ESCAPE). This
function reads all subsequent characters that belong with this
string, and copy them into the token parameter. The other
important, and slightly convoluted purpose of this function is to
merge adjacent strings. It looks forward a bit, and if the next
non comment, non whitespace item is a string, it reads it in as
well. If two adjacent strings are quoted, they are merged without
intervening space. Otherwise a single SPACE character is
inserted. */
static enum ETokenType getStringToken(UCHARBUF* buf,
UChar32 initialChar,
struct UString *token,
UErrorCode *status) {
UBool lastStringWasQuoted;
UChar32 c;
UChar target[3] = { '\0' };
UChar *pTarget = target;
int len=0;
UBool isFollowingCharEscaped=FALSE;
UBool isNLUnescaped = FALSE;
UChar32 prevC=0;
/* We are guaranteed on entry that initialChar is not a whitespace
character. If we are at the EOF, or have some other problem, it
doesn't matter; we still want to validly return the initialChar
(if nothing else) as a string token. */
if (U_FAILURE(*status)) {
return TOK_ERROR;
}
/* setup */
lastStringWasQuoted = FALSE;
c = initialChar;
ustr_setlen(token, 0, status);
if (U_FAILURE(*status)) {
return TOK_ERROR;
}
for (;;) {
if (c == QUOTE) {
if (!lastStringWasQuoted && token->fLength > 0) {
ustr_ucat(token, SPACE, status);
if (U_FAILURE(*status)) {
return TOK_ERROR;
}
}
lastStringWasQuoted = TRUE;
for (;;) {
c = ucbuf_getc(buf,status);
/* EOF reached */
if (c == U_EOF) {
return TOK_EOF;
}
/* Unterminated quoted strings */
if (U_FAILURE(*status)) {
return TOK_ERROR;
}
if (c == QUOTE && !isFollowingCharEscaped) {
break;
}
if (c == ESCAPE && !isFollowingCharEscaped) {
pTarget = target;
c = unescape(buf, status);
if (c == U_ERR) {
return TOK_ERROR;
}
if(c == CR || c == LF){
isNLUnescaped = TRUE;
}
}
if(c==ESCAPE && !isFollowingCharEscaped){
isFollowingCharEscaped = TRUE;
}else{
U_APPEND_CHAR32(c, pTarget,len);
pTarget = target;
ustr_uscat(token, pTarget,len, status);
isFollowingCharEscaped = FALSE;
len=0;
if(c == CR || c == LF){
if(isNLUnescaped == FALSE && prevC!=CR){
lineCount++;
}
isNLUnescaped = FALSE;
}
}
if (U_FAILURE(*status)) {
return TOK_ERROR;
}
prevC = c;
}
} else {
if (token->fLength > 0) {
ustr_ucat(token, SPACE, status);
if (U_FAILURE(*status)) {
return TOK_ERROR;
}
}
if(lastStringWasQuoted){
if(getShowWarning()){
warning(lineCount, "Mixing quoted and unquoted strings");
}
if(isStrict()){
return TOK_ERROR;
}
}
lastStringWasQuoted = FALSE;
/* if we reach here we are mixing
* quoted and unquoted strings
* warn in normal mode and error in
* pedantic mode
*/
if (c == ESCAPE) {
pTarget = target;
c = unescape(buf, status);
/* EOF reached */
if (c == U_EOF) {
return TOK_ERROR;
}
}
U_APPEND_CHAR32(c, pTarget,len);
pTarget = target;
ustr_uscat(token, pTarget,len, status);
len=0;
if (U_FAILURE(*status)) {
return TOK_ERROR;
}
for (;;) {
/* DON'T skip whitespace */
c = getNextChar(buf, FALSE, NULL, status);
/* EOF reached */
if (c == U_EOF) {
ucbuf_ungetc(c, buf);
return TOK_STRING;
}
if (U_FAILURE(*status)) {
return TOK_STRING;
}
if (c == QUOTE
|| c == OPENBRACE
|| c == CLOSEBRACE
|| c == COMMA
|| c == COLON) {
ucbuf_ungetc(c, buf);
break;
}
if (isWhitespace(c)) {
break;
}
if (c == ESCAPE) {
pTarget = target;
c = unescape(buf, status);
if (c == U_ERR) {
return TOK_ERROR;
}
}
U_APPEND_CHAR32(c, pTarget,len);
pTarget = target;
ustr_uscat(token, pTarget,len, status);
len=0;
if (U_FAILURE(*status)) {
return TOK_ERROR;
}
}
}
/* DO skip whitespace */
c = getNextChar(buf, TRUE, NULL, status);
if (U_FAILURE(*status)) {
return TOK_STRING;
}
if (c == OPENBRACE || c == CLOSEBRACE || c == COMMA || c == COLON) {
ucbuf_ungetc(c, buf);
return TOK_STRING;
}
}
}
/* Retrieve the next character. If skipwhite is
true, whitespace is skipped as well. */
static UChar32 getNextChar(UCHARBUF* buf,
UBool skipwhite,
struct UString *token,
UErrorCode *status) {
UChar32 c, c2;
if (U_FAILURE(*status)) {
return U_EOF;
}
for (;;) {
c = ucbuf_getc(buf,status);
if (c == U_EOF) {
return U_EOF;
}
if (skipwhite && isWhitespace(c)) {
continue;
}
/* This also handles the get() failing case */
if (c != SLASH) {
return c;
}
c = ucbuf_getc(buf,status); /* "/c" */
if (c == U_EOF) {
return U_EOF;
}
switch (c) {
case SLASH: /* "//" */
seekUntilNewline(buf, NULL, status);
break;
case ASTERISK: /* " / * " */
c2 = ucbuf_getc(buf, status); /* "/ * c" */
if(c2 == ASTERISK){ /* "/ * *" */
/* parse multi-line comment and store it in token*/
seekUntilEndOfComment(buf, token, status);
} else {
ucbuf_ungetc(c2, buf); /* c2 is the non-asterisk following "/ *". Include c2 back in buffer. */
seekUntilEndOfComment(buf, NULL, status);
}
break;
default:
ucbuf_ungetc(c, buf); /* "/c" - put back the c */
/* If get() failed this is a NOP */
return SLASH;
}
}
}
static void seekUntilNewline(UCHARBUF* buf,
struct UString *token,
UErrorCode *status) {
UChar32 c;
if (U_FAILURE(*status)) {
return;
}
do {
c = ucbuf_getc(buf,status);
/* add the char to token */
if(token!=NULL){
ustr_u32cat(token, c, status);
}
} while (!isNewline(c) && c != U_EOF && *status == U_ZERO_ERROR);
}
static void seekUntilEndOfComment(UCHARBUF *buf,
struct UString *token,
UErrorCode *status) {
UChar32 c, d;
uint32_t line;
if (U_FAILURE(*status)) {
return;
}
line = lineCount;
do {
c = ucbuf_getc(buf, status);
if (c == ASTERISK) {
d = ucbuf_getc(buf, status);
if (d != SLASH) {
ucbuf_ungetc(d, buf);
} else {
break;
}
}
/* add the char to token */
if(token!=NULL){
ustr_u32cat(token, c, status);
}
/* increment the lineCount */
isNewline(c);
} while (c != U_EOF && *status == U_ZERO_ERROR);
if (c == U_EOF) {
*status = U_INVALID_FORMAT_ERROR;
error(line, "unterminated comment detected");
}
}
U_CFUNC UChar32 unescape(UCHARBUF *buf, UErrorCode *status) {
if (U_FAILURE(*status)) {
return U_EOF;
}
/* We expect to be called after the ESCAPE has been seen, but
* u_fgetcx needs an ESCAPE to do its magic. */
ucbuf_ungetc(ESCAPE, buf);
return ucbuf_getcx32(buf, status);
}
static UBool isWhitespace(UChar32 c) {
switch (c) {
/* ' ', '\t', '\n', '\r', 0x2029, 0xFEFF */
case 0x000A:
case 0x2029:
lineCount++;
case 0x000D:
case 0x0020:
case 0x0009:
case 0xFEFF:
return TRUE;
default:
return FALSE;
}
}
static UBool isNewline(UChar32 c) {
switch (c) {
/* '\n', '\r', 0x2029 */
case 0x000A:
case 0x2029:
lineCount++;
case 0x000D:
return TRUE;
default:
return FALSE;
}
}