mirror of
https://git.lyx.org/repos/lyx.git
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1a3ed565d9
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@1206 a592a061-630c-0410-9148-cb99ea01b6c8
470 lines
9.2 KiB
C
470 lines
9.2 KiB
C
#include <config.h>
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#ifdef __GNUG__
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#pragma implementation
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#endif
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#include <algorithm>
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#include "lyxlex_pimpl.h"
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#include "support/lyxalgo.h"
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#include "support/filetools.h"
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#include "debug.h"
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using std::sort;
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using std::ostream;
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using std::ios;
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using std::istream;
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using std::endl;
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using std::lower_bound;
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// namespace {
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struct compare_tags {
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// used by lower_bound, sort and sorted
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inline
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int operator()(keyword_item const & a, keyword_item const & b) const {
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return compare_no_case(a.tag, b.tag) < 0;
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}
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};
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// } // end of anon namespace
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LyXLex::Pimpl::Pimpl(keyword_item * tab, int num)
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: is(&fb__), table(tab), no_items(num),
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status(0), lineno(0), commentChar('#')
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{
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verifyTable();
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}
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string const LyXLex::Pimpl::GetString() const
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{
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return string(buff);
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}
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void LyXLex::Pimpl::printError(string const & message) const
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{
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string tmpmsg = subst(message, "$$Token", GetString());
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lyxerr << "LyX: " << tmpmsg << " [around line " << lineno
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<< " of file " << MakeDisplayPath(name) << ']' << endl;
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}
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void LyXLex::Pimpl::printTable(ostream & os)
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{
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os << "\nNumber of tags: " << no_items << '\n';
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for (int i= 0; i < no_items; ++i)
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os << "table[" << i
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<< "]: tag: `" << table[i].tag
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<< "' code:" << table[i].code << '\n';
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os.flush();
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}
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void LyXLex::Pimpl::verifyTable()
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{
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// Check if the table is sorted and if not, sort it.
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if (table
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&& !sorted(table, table + no_items, compare_tags())) {
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lyxerr << "The table passed to LyXLex is not sorted!\n"
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<< "Tell the developers to fix it!" << endl;
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// We sort it anyway to avoid problems.
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lyxerr << "\nUnsorted:\n";
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printTable(lyxerr);
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sort(table, table + no_items, compare_tags());
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lyxerr << "\nSorted:\n";
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printTable(lyxerr);
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}
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}
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void LyXLex::Pimpl::pushTable(keyword_item * tab, int num)
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{
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pushed_table tmppu(table, no_items);
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pushed.push(tmppu);
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table = tab;
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no_items = num;
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verifyTable();
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}
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void LyXLex::Pimpl::popTable()
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{
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if (pushed.empty()) {
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lyxerr << "LyXLex error: nothing to pop!" << endl;
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return;
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}
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pushed_table tmp = pushed.top();
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pushed.pop();
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table = tmp.table_elem;
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no_items = tmp.table_siz;
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}
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bool LyXLex::Pimpl::setFile(string const & filename)
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{
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// The check only outputs a debug message, because it triggers
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// a bug in compaq cxx 6.2, where is_open() returns 'true' for a
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// fresh new filebuf. (JMarc)
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if (fb__.is_open() || is.tellg() > 0)
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lyxerr[Debug::LYXLEX] << "Error in LyXLex::setFile: "
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"file or stream already set." << endl;
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fb__.open(filename.c_str(), ios::in);
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is.rdbuf(&fb__);
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name = filename;
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lineno = 0;
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return fb__.is_open() && is.good();
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}
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void LyXLex::Pimpl::setStream(istream & i)
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{
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if (fb__.is_open() || is.tellg() > 0)
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lyxerr[Debug::LYXLEX] << "Error in LyXLex::setStream: "
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"file or stream already set." << endl;
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is.rdbuf(i.rdbuf());
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lineno = 0;
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}
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void LyXLex::Pimpl::setCommentChar(char c)
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{
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commentChar = c;
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}
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bool LyXLex::Pimpl::next(bool esc /* = false */)
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{
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if (!pushTok.empty()) {
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pushTok.copy(buff, string::npos);
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buff[pushTok.length()] = '\0';
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pushTok.erase();
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return true;
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}
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if (!esc) {
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unsigned char c = 0; // getc() returns an int
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char cc = 0;
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status = 0;
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while (is && !status) {
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is.get(cc);
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c = cc;
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if (c == commentChar) {
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// Read rest of line (fast :-)
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// That is not fast... (Lgb)
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#if 1
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is.getline(buff, sizeof(buff));
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lyxerr[Debug::LYXLEX] << "Comment read: `" << c
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<< buff << "'" << endl;
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#else
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// unfortunately is ignore buggy (Lgb)
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is.ignore(100, '\n');
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#endif
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++lineno;
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continue;
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}
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if (c == '\"') {
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int i = -1;
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do {
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is.get(cc);
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c = cc;
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if (c != '\r')
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buff[++i] = c;
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} while (c != '\"' && c != '\n' && is &&
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i != (LEX_MAX_BUFF - 2));
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if (i == (LEX_MAX_BUFF - 2)) {
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printError("Line too long");
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c = '\"'; // Pretend we got a "
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++i;
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}
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if (c != '\"') {
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printError("Missing quote");
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if (c == '\n')
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++lineno;
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}
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buff[i] = '\0';
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status = LEX_DATA;
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break;
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}
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if (c == ',')
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continue; /* Skip ','s */
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// using relational operators with chars other
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// than == and != is not safe. And if it is done
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// the type _have_ to be unsigned. It usually a
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// lot better to use the functions from cctype
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if (c > ' ' && is) {
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int i = 0;
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do {
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buff[i++] = c;
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is.get(cc);
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c = cc;
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} while (c > ' ' && c != ',' && is
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&& (i != LEX_MAX_BUFF - 1) );
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if (i == LEX_MAX_BUFF - 1) {
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printError("Line too long");
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}
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buff[i] = '\0';
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status = LEX_TOKEN;
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}
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if (c == '\r' && is) {
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// The Windows support has lead to the
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// possibility of "\r\n" at the end of
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// a line. This will stop LyX choking
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// when it expected to find a '\n'
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is.get(cc);
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c = cc;
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}
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if (c == '\n')
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++lineno;
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}
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if (status) return true;
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status = is.eof() ? LEX_FEOF: LEX_UNDEF;
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buff[0] = '\0';
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return false;
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} else {
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unsigned char c = 0; // getc() returns an int
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char cc = 0;
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status = 0;
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while (is && !status) {
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is.get(cc);
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c = cc;
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// skip ','s
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if (c == ',') continue;
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if (c == '\\') {
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// escape
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int i = 0;
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do {
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if (c == '\\') {
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// escape the next char
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is.get(cc);
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c = cc;
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}
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buff[i++] = c;
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is.get(cc);
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c = cc;
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} while (c > ' ' && c != ',' && is
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&& (i != LEX_MAX_BUFF - 1) );
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if (i == LEX_MAX_BUFF - 1) {
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printError("Line too long");
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}
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buff[i] = '\0';
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status = LEX_TOKEN;
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continue;
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}
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if (c == commentChar) {
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// Read rest of line (fast :-)
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// That is still not fast... (Lgb)
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#if 1
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is.getline(buff, sizeof(buff));
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lyxerr[Debug::LYXLEX] << "Comment read: `" << c
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<< buff << "'" << endl;
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#else
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// but ignore is also still buggy (Lgb)
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// This is fast (Lgb)
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is.ignore(100, '\n');
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#endif
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++lineno;
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continue;
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}
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// string
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if (c == '\"') {
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int i = -1;
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bool escaped = false;
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do {
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escaped = false;
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is.get(cc);
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c = cc;
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if (c == '\r') continue;
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if (c == '\\') {
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// escape the next char
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is.get(cc);
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c = cc;
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escaped = true;
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}
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buff[++i] = c;
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if (!escaped && c == '\"') break;
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} while (c != '\n' && is &&
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i != (LEX_MAX_BUFF - 2));
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if (i == (LEX_MAX_BUFF - 2)) {
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printError("Line too long");
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c = '\"'; // Pretend we got a "
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++i;
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}
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if (c != '\"') {
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printError("Missing quote");
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if (c == '\n')
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++lineno;
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}
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buff[i] = '\0';
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status = LEX_DATA;
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break;
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}
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if (c > ' ' && is) {
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int i = 0;
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do {
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if (c == '\\') {
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// escape the next char
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is.get(cc);
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c = cc;
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//escaped = true;
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}
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buff[i++] = c;
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is.get(cc);
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c = cc;
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} while (c > ' ' && c != ',' && is
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&& (i != LEX_MAX_BUFF-1) );
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if (i == LEX_MAX_BUFF-1) {
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printError("Line too long");
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}
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buff[i] = '\0';
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status = LEX_TOKEN;
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}
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// new line
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if (c == '\n')
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++lineno;
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}
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if (status) return true;
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status = is.eof() ? LEX_FEOF : LEX_UNDEF;
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buff[0] = '\0';
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return false;
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}
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}
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int LyXLex::Pimpl::search_kw(char const * const tag) const
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{
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keyword_item search_tag = { tag, 0 };
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keyword_item * res =
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lower_bound(table, table + no_items,
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search_tag, compare_tags());
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if (res != table + no_items
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&& !compare_no_case(res->tag, tag))
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return res->code;
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return LEX_UNDEF;
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}
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int LyXLex::Pimpl::lex()
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{
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//NOTE: possible bug.
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if (next() && status == LEX_TOKEN)
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return search_kw(buff);
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else
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return status;
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}
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bool LyXLex::Pimpl::EatLine()
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{
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int i = 0;
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unsigned char c = '\0';
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char cc = 0;
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while(is && c != '\n' && i != (LEX_MAX_BUFF - 1)) {
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is.get(cc);
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c = cc;
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lyxerr[Debug::LYXLEX] << "LyXLex::EatLine read char: `"
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<< c << "'" << endl;
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if (c != '\r')
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buff[i++] = c;
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}
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if (i == (LEX_MAX_BUFF - 1) && c != '\n') {
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printError("Line too long");
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c = '\n'; // Pretend we had an end of line
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--lineno; // but don't increase line counter (netto effect)
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++i; // and preserve last character read.
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}
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if (c == '\n') {
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++lineno;
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buff[--i] = '\0'; // i can never be 0 here, so no danger
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status = LEX_DATA;
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return true;
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} else {
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buff[i] = '\0';
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return false;
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}
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}
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bool LyXLex::Pimpl::nextToken()
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{
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if (!pushTok.empty()) {
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pushTok.copy(buff, string::npos);
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buff[pushTok.length()] = '\0';
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pushTok.erase();
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return true;
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}
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status = 0;
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while (is && !status) {
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unsigned char c = 0;
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char cc = 0;
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is.get(cc);
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c = cc;
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if (c >= ' ' && is) {
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int i = 0;
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if (c == '\\') { // first char == '\\'
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do {
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buff[i++] = c;
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is.get(cc);
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c = cc;
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} while (c > ' ' && c != '\\' && is
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&& i != (LEX_MAX_BUFF-1));
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} else {
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do {
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buff[i++] = c;
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is.get(cc);
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c = cc;
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} while (c >= ' ' && c != '\\' && is
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&& i != (LEX_MAX_BUFF-1));
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}
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if (i == (LEX_MAX_BUFF - 1)) {
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printError("Line too long");
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}
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if (c == '\\') is.putback(c); // put it back
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buff[i] = '\0';
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status = LEX_TOKEN;
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}
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if (c == '\n')
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++lineno;
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}
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if (status) return true;
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status = is.eof() ? LEX_FEOF: LEX_UNDEF;
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buff[0] = '\0';
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return false;
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}
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void LyXLex::Pimpl::pushToken(string const & pt)
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{
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pushTok = pt;
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}
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