Files
UglifyJS/test/compress/loops.js
Mihai Bazon 1a5fd3e052 optimization for if/break as first statement in a loop body
for(...; x; ...) if (y) break; → for(...; x&&!y; ...);

similarly for `while` and some combinations (i.e. the `break` appears in the
`else` clause, etc.)
2012-11-08 11:43:14 +02:00

124 lines
2.1 KiB
JavaScript

while_becomes_for: {
options = { loops: true };
input: {
while (foo()) bar();
}
expect: {
for (; foo(); ) bar();
}
}
drop_if_break_1: {
options = { loops: true };
input: {
for (;;)
if (foo()) break;
}
expect: {
for (; !foo(););
}
}
drop_if_break_2: {
options = { loops: true };
input: {
for (;bar();)
if (foo()) break;
}
expect: {
for (; bar() && !foo(););
}
}
drop_if_break_3: {
options = { loops: true };
input: {
for (;bar();) {
if (foo()) break;
stuff1();
stuff2();
}
}
expect: {
for (; bar() && !foo();) {
stuff1();
stuff2();
}
}
}
drop_if_break_4: {
options = { loops: true, sequences: true };
input: {
for (;bar();) {
x();
y();
if (foo()) break;
z();
k();
}
}
expect: {
for (; bar() && (x(), y(), !foo());) z(), k();
}
}
drop_if_else_break_1: {
options = { loops: true };
input: {
for (;;) if (foo()) bar(); else break;
}
expect: {
for (; foo(); ) bar();
}
}
drop_if_else_break_2: {
options = { loops: true };
input: {
for (;bar();) {
if (foo()) baz();
else break;
}
}
expect: {
for (; bar() && foo();) baz();
}
}
drop_if_else_break_3: {
options = { loops: true };
input: {
for (;bar();) {
if (foo()) baz();
else break;
stuff1();
stuff2();
}
}
expect: {
for (; bar() && foo();) {
baz();
stuff1();
stuff2();
}
}
}
drop_if_else_break_4: {
options = { loops: true, sequences: true };
input: {
for (;bar();) {
x();
y();
if (foo()) baz();
else break;
z();
k();
}
}
expect: {
for (; bar() && (x(), y(), foo());) baz(), z(), k();
}
}