lyx_mirror/src/lyxlex.C

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// 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 <cstdlib>
#ifdef __GNUG__
#pragma implementation "lyxlex.h"
#endif
#include "lyxlex.h"
#include "debug.h"
#include "support/filetools.h"
LyXLex::LyXLex(keyword_item * tab, int num)
: table(tab), no_items(num)
{
file = 0;
owns_file = false;
status = 0;
pushed = 0;
}
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 == 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;
}
void LyXLex::printTable()
{
lyxerr << "\nNumber of tags: " << no_items << endl;
for(int i=0; i<no_items; i++)
lyxerr << "table[" << i
<< "]: tag: `" << table[i].tag
<< "' code:" << table[i].code << endl;
lyxerr << endl;
}
void LyXLex::printError(string const & message)
{
string tmpmsg = subst(message, "$$Token", GetString());
lyxerr << "LyX: " << tmpmsg << " [around line " << lineno
<< " of file " << MakeDisplayPath(name) << ']' << endl;
}
bool LyXLex::setFile(string const & filename)
{
if (file)
lyxerr << "Error in LyXLex::setFile: file already set." <<endl;
file = fopen(filename.c_str(), "r");
name = filename;
owns_file = true;
lineno = 0;
return (file ? true : false);
}
void LyXLex::setFile(FILE * f)
{
if (file)
lyxerr << "Error in LyXLex::setFile: file already set." << endl;
file = f;
owns_file = false;
lineno = 0; // this is bogus if the file already has been read from
}
int LyXLex::lex()
{
//NOTE: possible bug.
if (next() && status==LEX_TOKEN)
return search_kw(buff);
else
return status;
}
int LyXLex::GetInteger()
{
if (buff[0]>' ')
return atoi(buff);
else {
printError("Bad integer `$$Token'");
return -1;
}
}
float LyXLex::GetFloat()
{
if (buff[0]>' ')
return (float)strtod(buff, (char**)0);
else {
printError("Bad float `$$Token'");
return -1;
}
}
string LyXLex::GetString() const
{
return string(buff);
}
// I would prefer to give a tag number instead of an explicit token
// here, but it is not possible because Buffer::readLyXformat2 uses
// explicit tokens (JMarc)
string LyXLex::getLongString(string const & endtoken)
{
string str, prefix;
bool firstline = true;
while (IsOK()) {
if (!EatLine())
// blank line in the file being read
continue;
string const token = frontStrip(strip(GetString()), " \t");
lyxerr[Debug::PARSER] << "LongString: `"
<< GetString() << '\'' << endl;
// We do a case independent comparison, like search_kw
// does.
if (compare_no_case(token, endtoken) != 0) {
string tmpstr = GetString();
if (firstline) {
unsigned int i = 0;
while(i < tmpstr.length()
&& tmpstr[i] == ' ') {
++i;
prefix += ' ';
}
firstline = false;
lyxerr[Debug::PARSER] << "Prefix = `" << prefix
<< '\'' << endl;
}
if (!prefix.empty()
&& prefixIs(tmpstr, prefix.c_str())) {
tmpstr.erase(0, prefix.length() - 1);
}
str += tmpstr + '\n';
}
else // token == endtoken
break;
}
if (!IsOK())
printError("Long string not ended by `" + endtoken + '\'');
return str;
}
bool LyXLex::GetBool()
{
if (compare(buff, "true") == 0)
return true;
else if (compare(buff, "false") != 0)
printError("Bad boolean `$$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 * const tag) const
{
int m, k=0 , l= 0, r=no_items;
while (l < r) {
m = (l+r)/2;
if (lyxerr.debugging(Debug::PARSER)) {
lyxerr << "LyXLex::search_kw: elem " << m
<< " tag " << table[m].tag
<< " search tag " << tag
<< endl;
}
if (table[m].tag)
k = compare_no_case(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=='\"') {
int 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)) {
int 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== '\r' && !feof(file)) {
// 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'
c = getc(file);
}
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
int 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=='\"') {
int 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)) {
int 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 * str[])
{
int i = -1;
if (next()) {
if (compare(buff, "default")) {
for (i = 0; str[i][0] && compare(str[i], buff); ++i);
if (!str[i][0]) {
printError("Unknown argument `$$Token'");
i = -1;
}
}
} else
printError("file ended while scanning string token");
return i;
}
int LyXLex::CheckToken(char const * str[], int print_error)
{
int i = -1;
if (compare(buff, "default")) {
for (i = 0; str[i][0] && compare(str[i], buff); i++);
if (!str[i][0]) {
if (print_error)
printError("Unknown argument `$$Token'");
i = -1;
}
}
return i;
}