lyx_mirror/src/lyxlex_pimpl.C

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#include <config.h>
#ifdef __GNUG__
#pragma implementation
#endif
#include <algorithm>
#include "lyxlex_pimpl.h"
#include "support/lyxalgo.h"
#include "support/filetools.h"
#include "debug.h"
using std::sort;
using std::ostream;
using std::ios;
using std::istream;
using std::endl;
using std::lower_bound;
// namespace {
struct compare_tags {
// used by lower_bound
inline
int operator()(keyword_item const & a, char const * const tag) const {
return compare_no_case(a.tag, tag) < 0;
}
// used by sorted and sort
inline
int operator()(keyword_item const & a, keyword_item const & b) const {
return compare_no_case(a.tag, b.tag) < 0;
}
};
// } // end of anon namespace
LyXLex::Pimpl::Pimpl(keyword_item * tab, int num)
: is(&fb__), table(tab), no_items(num),
status(0), pushed(0), lineno(0)
{
if (table && !sorted(table, table + no_items, compare_tags())) {
lyxerr << "The table passed to LyXLex is not sorted!!\n"
<< "Tell the developers to fix it!" << endl;
// We sort it anyway to avoid problems.
lyxerr << "\nUnsorted:\n";
printTable(lyxerr);
sort(table, table + no_items,
compare_tags());
lyxerr << "\nSorted:\n";
printTable(lyxerr);
}
}
string const LyXLex::Pimpl::GetString() const
{
return string(buff);
}
void LyXLex::Pimpl::printError(string const & message) const
{
string tmpmsg = subst(message, "$$Token", GetString());
lyxerr << "LyX: " << tmpmsg << " [around line " << lineno
<< " of file " << MakeDisplayPath(name) << ']' << endl;
}
void LyXLex::Pimpl::printTable(ostream & os)
{
os << "\nNumber of tags: " << no_items << '\n';
for(int i= 0; i < no_items; ++i)
os << "table[" << i
<< "]: tag: `" << table[i].tag
<< "' code:" << table[i].code << '\n';
os.flush();
}
void LyXLex::Pimpl::pushTable(keyword_item * tab, int num)
{
pushed_table * tmppu = new pushed_table;
tmppu->next = pushed;
tmppu->table_elem = table;
tmppu->table_siz = no_items;
pushed = tmppu;
table = tab;
no_items = num;
// Check if the table is sorted and if not, sort it.
if (table
&& !sorted(table, table + no_items, compare_tags())) {
lyxerr << "The table passed to LyXLex is not sorted!!\n"
<< "Tell the developers to fix it!" << endl;
// We sort it anyway to avoid problems.
lyxerr << "\nUnsorted:\n";
printTable(lyxerr);
sort(table, table + no_items, compare_tags());
lyxerr << "\nSorted:\n";
printTable(lyxerr);
}
}
void LyXLex::Pimpl::popTable()
{
if (pushed == 0)
lyxerr << "LyXLex error: nothing to pop!" << endl;
pushed_table * tmp;
tmp = pushed;
table = tmp->table_elem;
no_items = tmp->table_siz;
tmp->table_elem = 0;
pushed = tmp->next;
delete tmp;
}
bool LyXLex::Pimpl::setFile(string const & filename)
{
if (fb__.is_open())
lyxerr << "Error in LyXLex::setFile: "
"file or stream already set." << endl;
fb__.open(filename.c_str(), ios::in);
is.rdbuf(&fb__);
name = filename;
lineno = 0;
return fb__.is_open() && is.good();
}
void LyXLex::Pimpl::setStream(istream & i)
{
if (fb__.is_open() || is.rdbuf()->in_avail())
lyxerr << "Error in LyXLex::setStream: "
"file or stream already set." << endl;
is.rdbuf(i.rdbuf());
lineno = 0;
}
bool LyXLex::Pimpl::next(bool esc = false)
{
if (!esc) {
unsigned char c = 0; // getc() returns an int
char cc = 0;
status = 0;
while (is && !status) {
is.get(cc);
c = cc;
if (c == '#') {
// Read rest of line (fast :-)
is.getline(buff, sizeof(buff));
lyxerr[Debug::LYXLEX] << "Comment read: `" << c
<< buff << "'" << endl;
++lineno;
continue;
}
if (c == '\"') {
int i = -1;
do {
is.get(cc);
c = cc;
if (c != '\r')
buff[++i] = c;
} while (c != '\"' && c != '\n' && is &&
i != (LEX_MAX_BUFF - 2));
if (i == (LEX_MAX_BUFF - 2)) {
printError("Line too long");
c = '\"'; // Pretend we got a "
++i;
}
if (c != '\"') {
printError("Missing quote");
if (c == '\n')
++lineno;
}
buff[i] = '\0';
status = LEX_DATA;
break;
}
if (c == ',')
continue; /* Skip ','s */
// using relational operators with chars other
// than == and != is not safe. And if it is done
// the type _have_ to be unsigned. It usually a
// lot better to use the functions from cctype
if (c > ' ' && is) {
int i = 0;
do {
buff[i++] = c;
is.get(cc);
c = cc;
} while (c > ' ' && c != ',' && is
&& (i != LEX_MAX_BUFF - 1) );
if (i == LEX_MAX_BUFF - 1) {
printError("Line too long");
}
buff[i] = '\0';
status = LEX_TOKEN;
}
if (c == '\r' && is) {
// The Windows support has lead to the
// possibility of "\r\n" at the end of
// a line. This will stop LyX choking
// when it expected to find a '\n'
is.get(cc);
c = cc;
}
if (c == '\n')
++lineno;
}
if (status) return true;
status = is.eof() ? LEX_FEOF: LEX_UNDEF;
buff[0] = '\0';
return false;
} else {
unsigned char c = 0; // getc() returns an int
char cc = 0;
status = 0;
while (is && !status) {
is.get(cc);
c = cc;
// skip ','s
if (c == ',') continue;
if (c == '\\') {
// escape
int i = 0;
do {
if (c == '\\') {
// escape the next char
is.get(cc);
c = cc;
}
buff[i++] = c;
is.get(cc);
c = cc;
} while (c > ' ' && c != ',' && is
&& (i != LEX_MAX_BUFF - 1) );
if (i == LEX_MAX_BUFF - 1) {
printError("Line too long");
}
buff[i] = '\0';
status = LEX_TOKEN;
continue;
}
if (c == '#') {
// Read rest of line (fast :-)
is.getline(buff, sizeof(buff));
lyxerr[Debug::LYXLEX] << "Comment read: `" << c
<< buff << "'" << endl;
++lineno;
continue;
}
// string
if (c == '\"') {
int i = -1;
bool escaped = false;
do {
escaped = false;
is.get(cc);
c = cc;
if (c == '\r') continue;
if (c == '\\') {
// escape the next char
is.get(cc);
c = cc;
escaped = true;
}
buff[++i] = c;
if (!escaped && c == '\"') break;
} while (c != '\n' && is &&
i != (LEX_MAX_BUFF - 2));
if (i == (LEX_MAX_BUFF - 2)) {
printError("Line too long");
c = '\"'; // Pretend we got a "
++i;
}
if (c != '\"') {
printError("Missing quote");
if (c == '\n')
++lineno;
}
buff[i] = '\0';
status = LEX_DATA;
break;
}
if (c > ' ' && is) {
int i = 0;
do {
if (c == '\\') {
// escape the next char
is.get(cc);
c = cc;
//escaped = true;
}
buff[i++] = c;
is.get(cc);
c = cc;
} while (c > ' ' && c != ',' && is
&& (i != LEX_MAX_BUFF-1) );
if (i == LEX_MAX_BUFF-1) {
printError("Line too long");
}
buff[i] = '\0';
status = LEX_TOKEN;
}
// new line
if (c == '\n')
++lineno;
}
if (status) return true;
status = is.eof() ? LEX_FEOF : LEX_UNDEF;
buff[0] = '\0';
return false;
}
}
///
int LyXLex::Pimpl::search_kw(char const * const tag) const
{
keyword_item * res =
lower_bound(table, table + no_items,
tag, compare_tags());
if (res != table + no_items
&& !compare_no_case(res->tag, tag))
return res->code;
return LEX_UNDEF;
}
int LyXLex::Pimpl::lex()
{
//NOTE: possible bug.
if (next() && status == LEX_TOKEN)
return search_kw(buff);
else
return status;
}
bool LyXLex::Pimpl::EatLine()
{
int i = 0;
unsigned char c = '\0';
char cc = 0;
while(is && c != '\n' && i != (LEX_MAX_BUFF - 1)) {
is.get(cc);
c = cc;
lyxerr[Debug::LYXLEX] << "LyXLex::EatLine read char: `"
<< c << "'" << endl;
if (c != '\r')
buff[i++] = c;
}
if (i == (LEX_MAX_BUFF - 1) && c != '\n') {
printError("Line too long");
c = '\n'; // Pretend we had an end of line
--lineno; // but don't increase line counter (netto effect)
++i; // and preserve last character read.
}
if (c == '\n') {
++lineno;
buff[--i] = '\0'; // i can never be 0 here, so no danger
status = LEX_DATA;
return true;
} else {
buff[i] = '\0';
return false;
}
}
bool LyXLex::Pimpl::nextToken()
{
status = 0;
while (is && !status) {
unsigned char c = 0;
char cc = 0;
is.get(cc);
c = cc;
if (c >= ' ' && is) {
int i = 0;
if (c == '\\') { // first char == '\\'
do {
buff[i++] = c;
is.get(cc);
c = cc;
} while (c > ' ' && c != '\\' && is
&& i != (LEX_MAX_BUFF-1));
} else {
do {
buff[i++] = c;
is.get(cc);
c = cc;
} while (c >= ' ' && c != '\\' && is
&& i != (LEX_MAX_BUFF-1));
}
if (i == (LEX_MAX_BUFF - 1)) {
printError("Line too long");
}
if (c == '\\') is.putback(c); // put it back
buff[i] = '\0';
status = LEX_TOKEN;
}
if (c == '\n')
++lineno;
}
if (status) return true;
status = is.eof() ? LEX_FEOF: LEX_UNDEF;
buff[0] = '\0';
return false;
}