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/*
* Copyright (c) 2011 Samit Basu
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "OctaveScanner.hpp"
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include "Exception.hpp"
#include <algorithm>
static QHash<QString, TokenValueType> fm_oct_reserved;
static bool fm_oct_reserved_initialized = false;
static int TokenID = 1;
// TODO - static, until, do
static void InitializeReservedTable() {
if (fm_oct_reserved_initialized) return;
fm_oct_reserved["break"] = TOK_BREAK;
fm_oct_reserved["case"] = TOK_CASE;
fm_oct_reserved["catch"] = TOK_CATCH;
fm_oct_reserved["continue"] = TOK_CONTINUE;
fm_oct_reserved["dbstep"] = TOK_DBSTEP;
fm_oct_reserved["dbtrace"] = TOK_DBTRACE;
fm_oct_reserved["dbdown"] = TOK_DBDOWN;
fm_oct_reserved["dbup"] = TOK_DBUP;
fm_oct_reserved["else"] = TOK_ELSE;
fm_oct_reserved["elseif"] = TOK_ELSEIF;
fm_oct_reserved["end"] = TOK_END;
fm_oct_reserved["endwhile"] = TOK_END;
fm_oct_reserved["endswitch"] = TOK_END;
fm_oct_reserved["endif"] = TOK_END;
fm_oct_reserved["endfor"] = TOK_END;
fm_oct_reserved["endfunction"] = TOK_END;
fm_oct_reserved["end_try_catch"] = TOK_END;
fm_oct_reserved["end_unwind_protect"] = TOK_END;
fm_oct_reserved["for"] = TOK_FOR;
fm_oct_reserved["function"] = TOK_FUNCTION;
fm_oct_reserved["global"] = TOK_GLOBAL;
fm_oct_reserved["if"] = TOK_IF;
fm_oct_reserved["keyboard"] = TOK_KEYBOARD;
fm_oct_reserved["otherwise"] = TOK_OTHERWISE;
fm_oct_reserved["persistent"] = TOK_PERSISTENT;
fm_oct_reserved["quit"] = TOK_QUIT;
fm_oct_reserved["retall"] = TOK_RETALL;
fm_oct_reserved["return"] = TOK_RETURN;
fm_oct_reserved["switch"] = TOK_SWITCH;
fm_oct_reserved["try"] = TOK_TRY;
fm_oct_reserved["unwind_protect"] = TOK_TRY;
fm_oct_reserved["unwind_protect_cleanup"] = TOK_CATCH;
fm_oct_reserved["while"] = TOK_WHILE;
fm_oct_reserved_initialized = true;
}
static bool isalnumus(TokenValueType a) {
return (isalnum(a) || (a=='_'));
}
static bool isablank(TokenValueType a) {
return (a==' ' || a=='\t' || a=='\r');
}
OctaveScanner::OctaveScanner(QString buf, QString fname) : Scanner(buf,fname) {
InitializeReservedTable();
}
void OctaveScanner::fetchWhitespace() {
int len = 0;
while (isablank(ahead(len)) || ((ahead(len) == '\n') && !m_ignorews.top())) len++;
setToken(TOK_SPACE);
m_ptr += len;
}
void OctaveScanner::fetchOther() {
if (current() == '.') {
if (tryFetchBinary(".*",TOK_DOTTIMES)) return;
if (tryFetchBinary("./",TOK_DOTRDIV)) return;
if (tryFetchBinary(".\\",TOK_DOTLDIV)) return;
if (tryFetchBinary(".^",TOK_DOTPOWER)) return;
if (tryFetchBinary(".'",TOK_DOTTRANSPOSE)) return;
}
if (tryFetchBinary("++",TOK_INCR)) return;
if (tryFetchBinary("--",TOK_DECR)) return;
if (tryFetchBinary("+=",TOK_PLUS_EQ)) return;
if (tryFetchBinary("-=",TOK_MINUS_EQ)) return;
if (tryFetchBinary("<=",TOK_LE)) return;
if (tryFetchBinary(">=",TOK_GE)) return;
if (tryFetchBinary("==",TOK_EQ)) return;
if (tryFetchBinary("!=",TOK_NE)) return;
if (tryFetchBinary("&&",TOK_SAND)) return;
if (tryFetchBinary("||",TOK_SOR)) return;
if (current() == '!')
{
setToken('~');
m_ptr++;
return;
}
setToken(m_text[m_ptr].unicode());
if (m_text[m_ptr] == '[')
m_bracketDepth++;
if (m_text[m_ptr] == ']')
m_bracketDepth = qMin(0,m_bracketDepth-1);
if (m_text[m_ptr] == '{')
m_bracketDepth++;
if (m_text[m_ptr] == '}')
m_bracketDepth = qMin(0,m_bracketDepth-1);
m_ptr++;
}
void OctaveScanner::fetchIdentifier() {
int len = 0;
while (isalnumus(ahead(len))) len++;
// Collect the identifier into a string
QString ident(m_text.mid(m_ptr,len));
if (fm_oct_reserved.contains(ident))
setToken(fm_oct_reserved[ident]);
else
setToken(TOK_IDENT,m_text.mid(m_ptr,len));
m_ptr += len;
}
void OctaveScanner::fetchOctString() {
int len = 0;
// We want to advance, but skip double quotes
while ((ahead(len+1) != '\"') && (ahead(len+1) != '\n')) {
len++;
}
if (ahead(len+1) == '\n')
throw Exception("unterminated string" + context());
QString ret(m_text.mid(m_ptr+1,len));
setToken(TOK_STRING,ret);
m_ptr += len+2;
}
void OctaveScanner::fetch() {
if (m_ptr >= m_strlen)
setToken(TOK_EOF);
else if ((current() == '#') || (current() == '%')) {
fetchComment();
return;
} else if ((current() == '.') &&
(ahead(1) == '.') &&
(ahead(2) == '.')) {
fetchContinuation();
return;
} else if (m_blobFlag && !isablank(current()) &&
(current() != '\n') && (current() != ';') &&
(current() != ',') && (current() != '\'') &&
(current() != '%'))
fetchBlob();
else if (isalpha(current()))
fetchIdentifier();
else if (isdigit(current()) || ((current() == '.') && isdigit(ahead(1))))
fetchNumber();
else if (isablank(current())) {
fetchWhitespace();
if (m_ignorews.top()) return;
} else if ((current() == '\'') && !((previous() == '\'') ||
(previous() == ')') ||
(previous() == ']') ||
(previous() == '}') ||
(isalnumus(previous())))) {
fetchString();
} else if (current() == '\"') {
fetchOctString();
} else if ((current() == '\n') && m_ignorews.top() && (m_ignorews.size() > 1)) {
m_ptr++;
return;
} else
fetchOther();
m_tokValid = true;
}
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