home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Dream 52
/
Amiga_Dream_52.iso
/
Linux
/
Divers
/
lyx-0.13.2.tar.gz
/
lyx-0.13.2.tar
/
lyx-0.13.2
/
src
/
lyxlex.C
< prev
next >
Wrap
C/C++ Source or Header
|
1998-04-23
|
10KB
|
519 lines
// Generalized simple lexical analizer.
// It can be used for simple syntax parsers, like lyxrc,
// texclass and others to come. [asierra30/03/96]
//
// (C) 1996 Lyx Team.
#include <config.h>
//#include "definitions.h"
#include <stdlib.h>
#include <string.h>
#ifdef __GNUG__
#pragma implementation "lyxlex.h"
#endif
#include "lyxlex.h"
#include "error.h"
#include "filetools.h"
// $Id: lyxlex.C,v 1.1.1.1 1998/04/23 16:02:53 larsbj Exp $
#if !defined(lint) && !defined(WITH_WARNINGS)
static char vcid[] = "$Id: lyxlex.C,v 1.1.1.1 1998/04/23 16:02:53 larsbj Exp $";
#endif /* lint */
LyXLex::LyXLex(keyword_item* tab, int num)
: table(tab), no_items(num)
{
file = NULL;
owns_file = false;
status = 0;
pushed = NULL;
}
void LyXLex::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;
}
void LyXLex::popTable()
{
if (pushed == NULL)
lyxerr.print("LyXLex error: nothing to pop!");
pushed_table *tmp;
tmp = pushed;
table = tmp->table_elem;
no_items = tmp->table_siz;
tmp->table_elem = NULL;
pushed = tmp->next;
delete tmp;
}
void LyXLex::printTable()
{
lyxerr.print(LString("\nNumber of tags: ")+no_items);
for(int i=0; i<no_items; i++)
lyxerr.print(LString("table[")+i+
"]: tag: `"+table[i].tag+
"' code:"+table[i].code);
lyxerr.print(LString());
}
void LyXLex::printError(LString const & message)
{
LString tmpmsg = message;
tmpmsg.subst("$$Token",GetString());
lyxerr.print("LyX: "+tmpmsg+" [around line "+lineno+" of file "
+MakeDisplayPath(name)+']');
}
bool LyXLex::setFile(LString const & filename)
{
if (file)
lyxerr.print("Error in LyXLex::setFile: file already set.");
file = fopen(filename.c_str(), "r");
name = filename;
owns_file = true;
lineno = 0;
return (file ? true : false);
}
void LyXLex::setFile(FILE *f)
{
if (file)
lyxerr.print("Error in LyXLex::setFile: file already set.");
file = f;
owns_file = false;
lineno = 0; // this is bogus if the file already has been read from
}
int LyXLex::lex()
{
//NOTE: possible bug.
if (next() && status==LEX_TOKEN)
return search_kw(buff);
else
return status;
}
int LyXLex::GetInteger()
{
if (buff[0]>' ')
return atoi(buff);
else {
printError("Bad integer `$$Token'");
return -1;
}
}
float LyXLex::GetFloat()
{
if (buff[0]>' ')
return (float)strtod(buff, (char**)NULL);
else {
printError("Bad float `$$Token'");
return -1;
}
}
LString LyXLex::GetString() const
{
return LString(buff);
}
// I would prefer to give a tag number instead of an explicit token
// here, but it is not possible because Buffer::readLyXformat2 uses
// explicit tokens (JMarc)
LString LyXLex::getLongString(LString const &endtoken)
{
LString str, prefix;
bool firstline = true;
while (IsOK()) {
if (!EatLine())
// blank line in the file being read
continue;
LString const token = GetString().strip().frontStrip();
lyxerr.debug("LongString: `"+GetString()+'\'', Error::PARSER);
// We do a case independent comparison, like search_kw
// does.
if (strcasecmp(token.c_str(), endtoken.c_str()) != 0) {
LString tmpstr = GetString();
if (firstline) {
int i = 0;
while(i < tmpstr.length()
&& tmpstr[i] == ' ') {
i++;
prefix += ' ';
}
firstline = false;
lyxerr.debug("Prefix = `"+prefix+'\'',
Error::PARSER);
}
if (!prefix.empty()
&& tmpstr.prefixIs(prefix.c_str())) {
tmpstr.substring(prefix.length(),
tmpstr.length()-1);
}
str += tmpstr + '\n';
}
else // token == endtoken
break;
}
if (!IsOK())
printError("Long string not ended by `" + endtoken + '\'');
return str;
}
bool LyXLex::GetBool()
{
if (strcmp(buff, "true") == 0)
return true;
else if (strcmp(buff, "false") != 0)
printError("Bad boolean `$$Token'. Use \"false\" or \"true\"");
return false;
}
bool LyXLex::EatLine()
{
int i=0;
int c = '\0'; // getc() returns an int
while (!feof(file) && c!='\n' && i!=(LEX_MAX_BUFF-1)) {
c = getc(file);
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;
}
}
int LyXLex::search_kw(char const *tag) const
{
int m, k=0 , l= 0, r=no_items;
while (l < r) {
m = (l+r)/2;
#if DEBUG
LString my_l;
my_l+="LyXLex::search_kw: elem " ;
my_l+= m;
my_l+=" tag ";
my_l+=table[m].tag;
my_l+=" search tag ";
my_l+= tag;
lyxerr.debug(my_l,Error::PARSER);
#endif
//m,table[m].tag,tag);
if (!table[m].tag)
k = strcasecmp(table[m].tag, tag);
if (k==0)
return table[m].code;
else
if (k<0) l = m+1; else r = m;
}
return -1;
}
bool LyXLex::next(bool esc)
{
if (!esc) {
int c; // getc() returns an int
int i;
status = 0;
while (!feof(file) && !status) {
c = getc(file);
if (c=='#') {
// Read rest of line (fast :-)
fgets(buff, sizeof(buff), file);
lineno++;
continue;
}
if (c=='\"') {
i = -1;
do {
c = getc(file);
if (c != '\r')
buff[++i] = c;
} while (c!='\"' && c!='\n' && !feof(file) &&
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 */
if (c > ' ' && !feof(file)) {
i = 0;
do {
buff[i++] = c;
c = getc(file);
} while (c > ' ' && c != ',' && !feof(file) &&
(i != LEX_MAX_BUFF-1) );
if (i == LEX_MAX_BUFF-1) {
printError("Line too long");
}
buff[i] = '\0';
status = LEX_TOKEN;
}
if (c=='\n')
lineno++;
}
if (status) return true;
status = (feof(file)) ? LEX_FEOF: LEX_UNDEF;
buff[0] = '\0';
return false;
} else {
int c; // getc() returns an int
int i;
status = 0;
while (!feof(file) && !status) {
c = getc(file);
// skip ','s
if (c==',') continue;
if (c=='\\') {
// escape
i = 0;
do {
if (c == '\\') {
// escape the next char
c = getc(file);
}
buff[i++] = c;
c = getc(file);
} while (c > ' ' && c != ',' && !feof(file) &&
(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 :-)
fgets(buff, sizeof(buff), file);
lineno++;
continue;
}
// string
if (c=='\"') {
i = -1;
bool escaped = false;
do {
escaped = false;
c = getc(file);
if (c == '\r') continue;
if (c == '\\') {
// escape the next char
c = getc(file);
escaped = true;
}
buff[++i] = c;
if (!escaped && c == '\"') break;
} while (c!='\n' && !feof(file) &&
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 > ' ' && !feof(file)) {
i = 0;
do {
if (c == '\\') {
// escape the next char
c = getc(file);
//escaped = true;
}
buff[i++] = c;
c = getc(file);
} while (c > ' ' && c != ',' && !feof(file) &&
(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 = (feof(file)) ? LEX_FEOF: LEX_UNDEF;
buff[0] = '\0';
return false;
}
}
bool LyXLex::nextToken()
{
int c; // getc() returns an int
int i;
status = 0;
while (!feof(file) && !status) {
c = getc(file);
if (c >= ' ' && !feof(file)) {
i = 0;
if (c == '\\') { // first char == '\\'
do {
buff[i++] = c;
c = getc(file);
} while (c > ' ' && c != '\\' && !feof(file) &&
i != (LEX_MAX_BUFF-1));
} else {
do {
buff[i++] = c;
c = getc(file);
} while (c >= ' ' && c != '\\' && !feof(file)
&& i != (LEX_MAX_BUFF-1));
}
if (i == (LEX_MAX_BUFF-1)) {
printError("Line too long");
}
if (c == '\\') ungetc(c,file); // put it back
buff[i] = '\0';
status = LEX_TOKEN;
}
if (c=='\n')
lineno++;
}
if (status) return true;
status = (feof(file)) ? LEX_FEOF: LEX_UNDEF;
buff[0] = '\0';
return false;
}
int LyXLex::FindToken(char const* string[])
{
int i = -1;
if (next()) {
if (strcmp(buff, "default")) {
for (i=0; string[i][0] && strcmp(string[i], buff); i++);
if (!string[i][0]) {
printError("Unknown argument `$$Token'");
i = -1;
}
}
} else
printError("file ended while scanning string token");
return i;
}
int LyXLex::CheckToken(char const* string[], int print_error)
{
int i = -1;
if (strcmp(buff, "default")) {
for (i=0; string[i][0] && strcmp(string[i], buff); i++);
if (!string[i][0]) {
if (print_error)
printError("Unknown argument `$$Token'");
i = -1;
}
}
return i;
}