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string defaultformat(int n, string trailingzero="", bool fixed=false,
bool signed=true)
{
return "$%"+trailingzero+"."+string(n)+(fixed ? "f" : "g")+"$";
}
string defaultformat=defaultformat(4);
string ask(string prompt)
{
write(stdout,prompt);
return stdin;
}
string getstring(string name="", string default="", string prompt="",
bool store=true)
{
string[] history=history(name,1);
if(history.length > 0) default=history[0];
if(prompt == "") prompt=name+"? [%s] ";
prompt=replace(prompt,new string[][] {{"%s",default}});
string s=readline(prompt,name);
if(s == "") s=default;
else saveline(name,s,store);
return s;
}
int getint(string name="", int default=0, string prompt="", bool store=true)
{
return (int) getstring(name,(string) default,prompt,store);
}
real getreal(string name="", real default=0, string prompt="", bool store=true)
{
return (real) getstring(name,(string) default,prompt,store);
}
pair getpair(string name="", pair default=0, string prompt="", bool store=true)
{
return (pair) getstring(name,(string) default,prompt,store);
}
triple gettriple(string name="", triple default=(0,0,0), string prompt="",
bool store=true)
{
return (triple) getstring(name,(string) default,prompt,store);
}
// returns a string with all occurrences of string 'before' in string 's'
// changed to string 'after'.
string replace(string s, string before, string after)
{
return replace(s,new string[][] {{before,after}});
}
// Like texify but don't convert embedded TeX commands: \${}
string TeXify(string s)
{
static string[][] t={{"&","\&"},{"%","\%"},{"_","\_"},{"#","\#"},{"<","$<$"},
{">","$>$"},{"|","$|$"},{"^","$\hat{\ }$"},
{"~","$\tilde{\ }$"},{" ","\phantom{ }"}};
return replace(s,t);
}
private string[][] trans1={{'\\',"\backslash "},
{"$","\$"},{"{","\{"},{"}","\}"}};
private string[][] trans2={{"\backslash ","$\backslash$"}};
// Convert string to TeX
string texify(string s)
{
return TeXify(replace(replace(s,trans1),trans2));
}
// Convert string to TeX, preserving newlines
string verbatim(string s)
{
bool space=substr(s,0,1) == '\n';
static string[][] t={{'\n',"\\"}};
t.append(trans1);
s=TeXify(replace(replace(s,t),trans2));
return space ? "\ "+s : s;
}
// Split a string into an array of substrings delimited by delimiter
string[] split(string s, string delimiter)
{
string[] S;
int last=0;
int i;
int N=length(delimiter);
while((i=find(s,delimiter,last)) >= 0) {
if(i >= last)
S.push(substr(s,last,i-last));
last=i+N;
}
int n=length(s);
if(n >= last)
S.push(substr(s,last,n-last));
return S;
}
int[] operator ecast(string[] a)
{
return sequence(new int(int i) {return (int) a[i];},a.length);
}
real[] operator ecast(string[] a)
{
return sequence(new real(int i) {return (real) a[i];},a.length);
}
// Read contents of file as a string.
string file(string s)
{
file f=input(s);
string s;
while(!eof(f)) {
s += f+'\n';
}
return s;
}
string italic(string s)
{
return s != "" ? "{\it "+s+"}" : s;
}
string baseline(string s, string template="\strut")
{
return s != "" ? "\vphantom{"+template+"}"+s : s;
}
string math(string s)
{
return s != "" ? "$"+s+"$" : s;
}
private void notimplemented(string text)
{
abort(text+" is not implemented for the '"+settings.tex+"' TeX engine");
}
string graphic(string name, string options="")
{
if(latex()) {
if(options != "") options="["+options+"]";
return "\includegraphics"+options+"{"+name+"}";
}
if(settings.tex != "context")
notimplemented("graphic");
return "\externalfigure["+name+"]["+options+"]";
}
string minipage(string s, real width=100bp)
{
if(latex())
return "\begin{minipage}{"+(string) (width*pt)+"pt}"+s+"\end{minipage}";
if(settings.tex != "context")
notimplemented("minipage");
return "\startframedtext[none][frame=off,width="+(string) (width*pt)+
"pt]"+s+"\stopframedtext";
}
void usepackage(string s, string options="")
{
if(!latex()) notimplemented("usepackage");
string usepackage="\usepackage";
if(options != "") usepackage += "["+options+"]";
texpreamble(usepackage+"{"+s+"}");
}
void pause(string w="Hit enter to continue")
{
write(w);
w=stdin;
}
string math(real x)
{
return math((string) x);
}
string format(real x)
{
return format(defaultformat,x);
}
string phantom(string s)
{
return "\phantom{"+s+"}";
}
restricted int ocgindex=0;
void begin(picture pic=currentpicture, string name, string id="",
bool visible=true)
{
if(!latex() || !pdf()) return;
settings.twice=true;
if(id == "") id=string(++ocgindex);
tex(pic,"\begin{ocg}{"+name+"}{"+id+"}{"+(visible ? "1" : "0")+"}");
layer(pic);
}
void end(picture pic=currentpicture)
{
if(!latex() || !pdf()) return;
tex(pic,"\end{ocg}");
layer(pic);
}
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