// Switch to new zone ("!zone" or "!zn"). Has to be re-entrant.
static enum eos_t PO_zone(void) {
section_t entry_values;// buffer for outer zone
char* new_title;
bool allocated;
// remember everything about current structure
entry_values = *Section_now;
// set default values in case there is no valid title
new_title = untitled;
allocated = FALSE;
// Check whether a zone title is given. If yes and it can be read,
// get copy, remember pointer and remember to free it later on.
if(BYTEFLAGS(GotByte) & CONTS_KEYWORD) {
// Because we know of one character for sure,
// there's no need to check the return value.
Input_read_keyword();
new_title = DynaBuf_get_copy(GlobalDynaBuf);
allocated = TRUE;
}
// setup new section
// section type is "subzone", just in case a block follows
Section_new_zone(Section_now, "Subzone", new_title, allocated);
if(Parse_optional_block()) {
// Block has been parsed, so it was a SUBzone.
Section_finalize(Section_now);// end inner zone
*Section_now = entry_values;// restore entry values
} else {
// no block found, so it's a normal zone change
Section_finalize(&entry_values);// end outer zone
Section_now->type = type_zone;// change type to "zone"
}
return(ENSURE_EOS);
}
// Append to GlobalDynaBuf while characters are legal for keywords.
// Throws "missing string" error if none.
// Returns number of characters added.
int Input_append_keyword_to_global_dynabuf(void) {
int length = 0;
// add characters to buffer until an illegal one comes along
while(BYTEFLAGS(GotByte) & CONTS_KEYWORD) {
DYNABUF_APPEND(GlobalDynaBuf, GotByte);
length++;
GetByte();
}
if(length == 0)
Throw_error(exception_missing_string);
return(length);
}
// Deliver source code from current file (!) in shortened high-level format
static char get_processed_from_file(void) {
int from_file;
do {
switch(Input_now->state) {
case INPUTSTATE_NORMAL:
// fetch a fresh byte from the current source file
//from_file = getc(Input_now->src.fd);
from_file = hacked_getc(Input_now);
// now process it
/*FALLTHROUGH*/
case INPUTSTATE_AGAIN:
// Process the latest byte again. Of course, this only
// makes sense if the loop has executed at least once,
// otherwise the contents of from_file are undefined.
// If the source is changed so there is a possibility
// to enter INPUTSTATE_AGAIN mode without first having
// defined "from_file", trouble may arise...
Input_now->state = INPUTSTATE_NORMAL;
// EOF must be checked first because it cannot be used
// as an index into Byte_flags[]
if(from_file == EOF) {
// remember to send an end-of-file
Input_now->state = INPUTSTATE_EOF;
return(CHAR_EOS);// end of statement
}
// check whether character is special one
// if not, everything's cool and froody, so return it
if((BYTEFLAGS(from_file) & BYTEIS_SYNTAX) == 0)
return((char) from_file);
// check special characters ("0x00 TAB LF CR SPC :;}")
switch(from_file) {
case CHAR_TAB:// TAB character
case ' ':
// remember to skip all following blanks
Input_now->state = INPUTSTATE_SKIPBLANKS;
return(' ');
case CHAR_LF:// LF character
// remember to send a start-of-line
Input_now->state = INPUTSTATE_LF;
return(CHAR_EOS);// end of statement
case CHAR_CR:// CR character
// remember to check CRLF + send start-of-line
Input_now->state = INPUTSTATE_CR;
return(CHAR_EOS);// end of statement
case CHAR_EOB:
// remember to send an end-of-block
Input_now->state = INPUTSTATE_EOB;
return(CHAR_EOS);// end of statement
case CHAR_STATEMENT_DELIMITER:
// just deliver an EOS instead
return(CHAR_EOS);// end of statement
case CHAR_COMMENT_SEPARATOR:
// remember to skip remainder of line
Input_now->state = INPUTSTATE_COMMENT;
return(CHAR_EOS);// end of statement
default:
// complain if byte is 0
Throw_error("Source file contains illegal character.");
return((char) from_file);
}
case INPUTSTATE_SKIPBLANKS:
// read until non-blank, then deliver that
do {
// from_file = getc(Input_now->src.fd);
from_file = hacked_getc(Input_now);
} while((from_file == CHAR_TAB) || (from_file == ' '));
// re-process last byte
Input_now->state = INPUTSTATE_AGAIN;
break;
case INPUTSTATE_LF:
// return start-of-line, then continue in normal mode
Input_now->state = INPUTSTATE_NORMAL;
return(CHAR_SOL);// new line
case INPUTSTATE_CR:
// return start-of-line, remember to check for LF
Input_now->state = INPUTSTATE_SKIPLF;
return(CHAR_SOL);// new line
case INPUTSTATE_SKIPLF:
from_file = hacked_getc(Input_now);
// if LF, ignore it and fetch another byte
// otherwise, process current byte
if(from_file == CHAR_LF)
Input_now->state = INPUTSTATE_NORMAL;
else
Input_now->state = INPUTSTATE_AGAIN;
break;
case INPUTSTATE_COMMENT:
// read until end-of-line or end-of-file
do
from_file = hacked_getc(Input_now);
while((from_file != EOF) && (from_file != CHAR_CR) && (from_file != CHAR_LF));
// re-process last byte
Input_now->state = INPUTSTATE_AGAIN;
break;
case INPUTSTATE_EOB:
// deliver EOB
Input_now->state = INPUTSTATE_NORMAL;
return(CHAR_EOB);// end of block
case INPUTSTATE_EOF:
// deliver EOF
Input_now->state = INPUTSTATE_NORMAL;
return(CHAR_EOF);// end of file
default:
Bug_found("StrangeInputMode", Input_now->state);
}
} while(TRUE);
}