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parser:: skip_white

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This commit is contained in:
Zeno Rogue 2019-12-23 21:18:26 +01:00
parent 26b565702c
commit c70c082f36
1 changed files with 17 additions and 8 deletions
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25
util.cpp
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@ -139,6 +139,10 @@ struct exp_parser {
return false;
}
void skip_white();
char snext(int step=0) { skip_white(); return next(step); }
cld parse(int prio = 0);
cld parsepar() {
@ -151,9 +155,13 @@ struct exp_parser {
};
#endif
void exp_parser::skip_white() {
while(next() == ' ' || next() == '\n' || next() == '\r' || next() == '\t') at++;
}
cld exp_parser::parse(int prio) {
cld res;
while(next() == ' ') at++;
skip_white();
if(eat("sin(")) res = sin(parsepar());
else if(eat("cos(")) res = cos(parsepar());
else if(eat("sinh(")) res = sinh(parsepar());
@ -177,24 +185,24 @@ cld exp_parser::parse(int prio) {
else if(eat("to01(")) { res = parsepar(); return atan(res) / ld(M_PI) + ld(0.5); }
else if(eat("ifp(")) {
cld cond = parse(0);
if(next() != ',') {at = -1; return 0; } at++;
if(snext() != ',') {at = -1; return 0; } at++;
cld yes = parse(0);
if(next() != ',') {at = -1; return 0; } at++;
if(snext() != ',') {at = -1; return 0; } at++;
cld no = parsepar();
return real(cond) > 0 ? yes : no;
}
else if(eat("wallif(")) {
cld val0 = parse(0);
if(next() != ',') {at = -1; return 0; } at++;
if(snext() != ',') {at = -1; return 0; } at++;
cld val1 = parsepar();
if(real(extra_params["p"]) >= 3.5) return val0;
else return val1;
}
else if(eat("rgb(")) {
cld val0 = parse(0);
if(next() != ',') {at = -1; return 0; } at++;
if(snext() != ',') {at = -1; return 0; } at++;
cld val1 = parse(0);
if(next() != ',') {at = -1; return 0; } at++;
if(snext() != ',') {at = -1; return 0; } at++;
cld val2 = parsepar();
switch(int(real(extra_params["p"]) + .5)) {
case 1: return val0;
@ -205,16 +213,17 @@ cld exp_parser::parse(int prio) {
}
else if(eat("let(")) {
string name;
skip_white();
while(true) {
char c = next();
if((c >= '0' && c <= '9') || (c == '.' && next(1) != '.') || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_')
name += c, at++;
else break;
}
if(next() != '=') { at = -1; return 0; }
if(snext() != '=') { at = -1; return 0; }
at++;
cld val = parse(0);
if(next() != ',') { at = -1; return 0; }
if(snext() != ',') { at = -1; return 0; }
at++;
dynamicval<cld> d(extra_params[name], val);
return parsepar();