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Code Issues Releases Wiki Activity

number editor now accepts expressions

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This commit is contained in:
Zeno Rogue 2018-09-10 17:09:04 +02:00
parent 0dbe4822ec
commit f53961658b
1 changed files with 67 additions and 3 deletions
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70
dialogs.cpp
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@ -599,6 +599,68 @@ namespace dialog {
reaction_t extra_options;
struct exp_parser {
string s;
int at;
exp_parser() { at = 0; }
bool ok() { return at == isize(s); }
char next() { if(at == isize(s) || at == -1) return 0; else return s[at]; }
bool eat(const char *c) {
int orig_at = at;
while(*c && *c == next()) at++, c++;
if(*c == 0) return true;
else at = orig_at;
return false;
}
ld parse(int prio = 0) {
ld res;
if(eat("sin(")) res = sin(parsepar());
else if(eat("cos(")) res = cos(parsepar());
else if(eat("sinh(")) res = sinh(parsepar());
else if(eat("cosh(")) res = cosh(parsepar());
else if(eat("asin(")) res = asin(parsepar());
else if(eat("acos(")) res = acos(parsepar());
else if(eat("asinh(")) res = asinh(parsepar());
else if(eat("acosh(")) res = acosh(parsepar());
else if(eat("exp(")) res = exp(parsepar());
else if(eat("log(")) res = log(parsepar());
else if(next() == '(') at++, res = parsepar();
else {
string number;
while(true) {
char c = next();
if((c >= '0' && c <= '9') || among(c, 'e', 'p', '.'))
number += c, at++;
else break;
}
if(number == "e") res = exp(1);
else if(number == "p") res = M_PI;
else if(number == "") at = -1;
else if(number[0] >= 'a' && number[0] <= 'z') at = -1;
else { std::stringstream ss; res = 0; ss << number; ss >> res; }
}
while(true) {
if(next() == '+' && prio == 0) at++, res = res + parse(1);
else if(next() == '-' && prio == 0) at++, res = res - parse(1);
else if(next() == '*' && prio <= 1) at++, res = res * parse(2);
else if(next() == '/' && prio <= 1) at++, res = res / parse(2);
else if(next() == '^') at++, res = pow(res, parse(3));
else break;
}
return res;
}
ld parsepar() {
ld res = parse();
if(next() != ')') { at = -1; return res; }
at++;
return res;
}
};
void affect(char kind) {
if(ne.intval) {
@ -607,8 +669,10 @@ namespace dialog {
}
else {
if(kind == 's') {
ld x;
sscanf(ne.s.c_str(), LDF, &x);
exp_parser ep;
ep.s = ne.s;
ld x = ep.parse();
if(!ep.ok()) return;
if(ne.sc.positive && x <= 0) return;
*ne.editwhat = x;
}
@ -730,7 +794,7 @@ namespace dialog {
keyhandler = [] (int sym, int uni) {
handleNavigation(sym, uni);
if((uni >= '0' && uni <= '9') || (uni == '.' && !ne.intval) || (uni == '-' && !ne.sc.positive)) {
if((uni >= '0' && uni <= '9') || (uni == '.' && !ne.intval) || among(uni, '+', '-', '*', '/', '^', '(', ')') || (uni >= 'a' && uni <= 'z')) {
ne.s += uni;
affect('s');
}