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enhance booleans (#3657)

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This commit is contained in:
Alex Lam S.L
2019-12-30 22:41:11 +08:00
committed by GitHub
parent 78c8efd851
commit 4dbdac9c31
4 changed files with 78 additions and 27 deletions
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45
lib/compress.js
View File

@@ -241,7 +241,7 @@ merge(Compressor.prototype, {
return this.TYPE == node.TYPE && this.print_to_string() == node.print_to_string();
});
AST_Scope.DEFMETHOD("process_expression", function(insert, compressor) {
AST_Scope.DEFMETHOD("process_expression", function(insert, transform) {
var self = this;
var tt = new TreeTransformer(function(node) {
if (insert && node instanceof AST_SimpleStatement) {
@@ -250,13 +250,7 @@ merge(Compressor.prototype, {
});
}
if (!insert && node instanceof AST_Return) {
if (compressor) {
var value = node.value && node.value.drop_side_effect_free(compressor, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
}
return make_node(AST_SimpleStatement, node, {
return transform ? transform(node) : make_node(AST_SimpleStatement, node, {
body: node.value || make_node(AST_UnaryPrefix, node, {
operator: "void",
expression: make_node(AST_Number, node, {
@@ -361,6 +355,7 @@ merge(Compressor.prototype, {
function reset_def(tw, compressor, def) {
def.assignments = 0;
def.bool_fn = 0;
def.chained = false;
def.cross_loop = false;
def.direct_access = false;
@@ -598,6 +593,7 @@ merge(Compressor.prototype, {
var exp = this.expression;
if (!(exp instanceof AST_SymbolRef)) return;
var def = exp.definition();
if (tw.in_boolean_context()) def.bool_fn++;
if (!(def.fixed instanceof AST_Defun)) return;
var defun = mark_defun(tw, def);
if (!defun) return;
@@ -4560,7 +4556,12 @@ merge(Compressor.prototype, {
}
if (exp instanceof AST_Function && (!exp.name || !exp.name.definition().references.length)) {
var node = this.clone();
exp.process_expression(false, compressor);
exp.process_expression(false, function(node) {
var value = node.value && node.value.drop_side_effect_free(compressor, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
});
exp.walk(new TreeWalker(function(node) {
if (node instanceof AST_Return && node.value) {
node.value = node.value.drop_side_effect_free(compressor);
@@ -6685,6 +6686,32 @@ merge(Compressor.prototype, {
if (compressor.option("reduce_vars") && is_lhs(compressor.self(), parent) !== compressor.self()) {
var def = self.definition();
var fixed = self.fixed_value();
if (compressor.option("booleans") && def.bool_fn === def.references.length && fixed instanceof AST_Lambda) {
def.bool_fn = null;
fixed.process_expression(false, function(node) {
if (!node.value) return node;
var value = node.value.is_truthy() || node.value.tail_node().evaluate(compressor);
if (!value) {
value = node.value.drop_side_effect_free(compressor);
node.value = value ? make_sequence(node.value, [
value,
make_node(AST_Number, node.value, {
value: 0
})
]) : null;
} else if (value && !(value instanceof AST_Node)) {
var num = make_node(AST_Number, node.value, {
value: 1
});
value = node.value.drop_side_effect_free(compressor);
node.value = value ? make_sequence(node.value, [
value,
num
]) : num;
}
return node;
});
}
var single_use = def.single_use && !(parent instanceof AST_Call && parent.is_expr_pure(compressor));
if (single_use && fixed instanceof AST_Lambda) {
if (def.scope !== self.scope

24
test/compress/booleans.js
View File

@@ -86,3 +86,27 @@ issue_3465_3: {
}
expect_stdout: "PASS"
}
issue_2737_2: {
options = {
booleans: true,
inline: true,
reduce_vars: true,
unused: true,
}
input: {
(function(bar) {
for (;bar();) break;
})(function qux() {
return console.log("PASS"), qux;
});
}
expect: {
(function(bar) {
for (;bar();) break;
})(function() {
return console.log("PASS"), 1;
});
}
expect_stdout: "PASS"
}