exit(1);
}
-bool is_whitespace_char(char c)
-{
- return ((c==' ') || (c=='\t') || (c=='\n') || (c=='\r'));
-}
-
-char first_non_whitespace_char(char const * s)
-{
- int l = strlen(s);
- int pos = 0;
- while ((pos<l)&&is_whitespace_char(s[pos]))
- pos++;
- return s[pos];
-}
-
-char last_non_whitespace_char(char const * s)
-{
- int pos = strlen(s)-1;
- while ((pos>=0) && is_whitespace_char(s[pos]))
- pos--;
- return s[pos];
-}
-
-string strip_whitespace(string const & s)
-{
- string s2;
- int l = s.length();
- for (int pos=0; pos<l; ++pos) {
- if (!is_whitespace_char(s[pos])) s2 += s[pos];
- }
- return s2;
-}
-
G__value exec_tempfile(string const & command)
{
G__value retval;
{
#ifdef OBSCURE_CINT_HACK
static G__value ref_symbol = exec_tempfile("symbol ginac_cint_internal_symbol; ginac_cint_internal_symbol;");
+ static G__value ref_constant = exec_tempfile("constant ginac_cint_internal_constant; ginac_cint_internal_constant;");
static G__value ref_function = exec_tempfile("sin(ginac_cint_internal_symbol);");
static G__value ref_power = exec_tempfile("power(ex(ginac_cint_internal_symbol),ex(ginac_cint_internal_symbol));");
static G__value ref_numeric = exec_tempfile("numeric ginac_cint_internal_numeric; ginac_cint_internal_numeric;");
+"LAST="+varname+";\n"
+"cout << \""+varname+" = \" << "+varname+" << endl << endl;");
} else if (TYPES_EQUAL(retval,ref_symbol)||
+ TYPES_EQUAL(retval,ref_constant)||
TYPES_EQUAL(retval,ref_function)||
TYPES_EQUAL(retval,ref_power)||
TYPES_EQUAL(retval,ref_numeric)) {
if (!basic_type_warning_already_displayed) {
- cout << "WARNING: The return value of the last expression you entered was a symbol," << endl
- << "function, power or numeric, which cannot be safely displayed." << endl
+ cout << endl
+ <<"WARNING: The return value of the last expression you entered was a symbol," << endl
+ << "constant, function, power or numeric, which cannot be safely displayed." << endl
<< "To force the output, cast it explicitly to type 'ex' or use 'cout'," << endl
<< "for example (assume 'x' is a symbol):" << endl
<< PROMPT "ex(x);" << endl
<< endl;
}
+string preprocess(char const * line, bool & comment, bool & single_quote,
+ bool & double_quote, unsigned & open_braces)
+{
+ // "preprocess" the line entered to be able to decide if the command shall be
+ // executed directly or more input is needed or this is a special command
+
+ // all whitespace will be removed
+ // all comments (/* */ and //) will be removed
+ // open and close braces ( { and } ) outside strings will be counted
+
+ /*
+ cout << "line=" << line << endl;
+ cout << "comment=" << comment << ", single_quote=" << single_quote
+ << ",double_quote=" << double_quote << ", open_braces=" << open_braces
+ << endl;
+ */
+
+ string preprocessed;
+ int pos=0;
+ bool end=false;
+ bool escape=false;
+ bool slash=false;
+ bool asterisk=false;
+ while ((line[pos]!='\0')&&!end) {
+ if (escape) {
+ // last character was a \, ignore this one
+ escape=false;
+ } else if (slash) {
+ // last character was a /, test if * or /
+ slash=false;
+ if (line[pos]=='/') {
+ end=true;
+ } else if (line[pos]=='*') {
+ comment=true;
+ } else {
+ preprocessed += '/';
+ }
+ } else if (asterisk) {
+ // last character was a *, test if /
+ asterisk=false;
+ if (line[pos]=='/') {
+ comment=false;
+ } else if (line[pos]=='*') {
+ preprocessed += '*';
+ asterisk=true;
+ }
+ } else {
+ switch (line[pos]) {
+ case ' ':
+ case '\t':
+ case '\n':
+ case '\r':
+ // whitespace: ignore
+ break;
+ case '\\':
+ // escape character, ignore next
+ escape=true;
+ break;
+ case '"':
+ if ((!single_quote)&&(!comment)) {
+ double_quote = !double_quote;
+ }
+ break;
+ case '\'':
+ if ((!double_quote)&&(!comment)) {
+ single_quote = !single_quote;
+ }
+ break;
+ case '{':
+ if ((!single_quote)&&(!double_quote)&&(!comment)) {
+ open_braces++;
+ }
+ break;
+ case '}':
+ if ((!single_quote)&&(!double_quote)&&(!comment)&&(open_braces>0)) {
+ open_braces--;
+ }
+ break;
+ case '/':
+ slash=true;
+ break;
+ case '*':
+ asterisk=true;
+ break;
+ default:
+ preprocessed += line[pos];
+ }
+ }
+ pos++;
+ }
+
+ /*
+ cout << "preprocessed=" << preprocessed << endl;
+ cout << "comment=" << comment << ", single_quote=" << single_quote
+ << ",double_quote=" << double_quote << ", open_braces=" << open_braces
+ << endl;
+ */
+
+ return preprocessed;
+}
+
int main(void)
{
char *line;
exec_tempfile("ex LAST,LLAST,LLLAST;\n");
bool quit = false;
- bool next_command_is_function=false;
+ bool next_command_is_function=false;
+ bool single_quote=false;
+ bool double_quote=false;
+ bool comment=false;
+ unsigned open_braces=0;
+
while (!quit) {
strcpy(prompt,PROMPT);
- int open_braces = 0;
bool end_of_command = false;
string command;
+ string preprocessed;
while (!end_of_command) {
line = G__input(prompt);
-
- int pos = 0;
- bool double_quote = false;
- bool single_quote = false;
- while(line[pos]!='\0') {
- switch(line[pos]) {
- case '"':
- if (!single_quote) double_quote = !double_quote;
- break;
- case '\'':
- if (!double_quote) single_quote = !single_quote;
- break;
- case '{':
- if ((!single_quote) && (!double_quote)) open_braces++;
- break;
- case '}':
- if ((!single_quote) && (!double_quote)) open_braces--;
- break;
- }
- pos++;
- }
command += line;
- command += '\n';
- if (open_braces==0) {
- if ((first_non_whitespace_char(command.c_str())=='#')||
- (first_non_whitespace_char(command.c_str())=='.')||
- (last_non_whitespace_char(command.c_str())==';')||
- (last_non_whitespace_char(command.c_str())=='}')) {
+ command += "\n";
+ preprocessed += preprocess(line,comment,single_quote,double_quote,open_braces);
+ if ((open_braces==0)&&(!single_quote)&&(!double_quote)&&(!comment)) {
+ unsigned l=preprocessed.length();
+ if ((l==0)||
+ (preprocessed[0]=='#')||
+ (preprocessed[0]=='.')||
+ (preprocessed[l-1]==';')||
+ (preprocessed[l-1]=='}')) {
end_of_command=true;
}
}
strcpy(prompt," > ");
}
- string stripped_command=strip_whitespace(command);
- if ((stripped_command=="quit;")||
- (stripped_command=="exit;")||
- (stripped_command=="bye;")||
- (stripped_command==".q")||
- (stripped_command==".quit")||
- (stripped_command==".exit")||
- (stripped_command==".bye")) {
+ if ((preprocessed=="quit;")||
+ (preprocessed=="exit;")||
+ (preprocessed=="bye;")||
+ (preprocessed==".q")||
+ (preprocessed==".quit")||
+ (preprocessed==".exit")||
+ (preprocessed==".bye")) {
quit = true;
- } else if (stripped_command==".function") {
+ } else if (preprocessed==".function") {
cout << "next expression can be a function definition" << endl;
next_command_is_function=true;
- } else if (stripped_command==".cint") {
+ } else if (preprocessed==".cint") {
cout << endl << "switching to cint interactive mode" << endl;
cout << "'h' for help, 'q' to quit, '{ statements }' or 'p [expression]' to evaluate" << endl;
G__pause();
cout << "back from cint" << endl;
- } else if (command[0]=='.') {
+ /* test for more special commands
+ } else if (preprocessed==".xyz") {
cout << "special command (TBD): " << command << endl;
+ */
} else {
// cout << "now processing: " << command << endl;
if (next_command_is_function) {
git://www.ginac.de / ginac.git / blobdiff