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improve code reuse (#2542)

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This commit is contained in:
Alex Lam S.L
2017-12-01 03:40:46 +08:00
committed by GitHub
parent c58d3936a3
commit 172079a47f
4 changed files with 37 additions and 30 deletions
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40
lib/compress.js
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@@ -145,6 +145,26 @@ merge(Compressor.prototype, {
return true;
return false;
},
in_boolean_context: function() {
if (!this.option("booleans")) return false;
var self = this.self();
for (var i = 0, p; p = this.parent(i); i++) {
if (p instanceof AST_SimpleStatement
|| p instanceof AST_Conditional && p.condition === self
|| p instanceof AST_DWLoop && p.condition === self
|| p instanceof AST_For && p.condition === self
|| p instanceof AST_If && p.condition === self
|| p instanceof AST_UnaryPrefix && p.operator == "!" && p.expression === self) {
return true;
}
if (p instanceof AST_Binary && (p.operator == "&&" || p.operator == "||")
|| p.tail_node() === self) {
self = p;
} else {
return false;
}
}
},
compress: function(node) {
if (this.option("expression")) {
node.process_expression(true);
@@ -1547,7 +1567,7 @@ merge(Compressor.prototype, {
|| this.alternative._dot_throw(compressor);
})
def(AST_Sequence, function(compressor) {
return this.expressions[this.expressions.length - 1]._dot_throw(compressor);
return this.tail_node()._dot_throw(compressor);
});
def(AST_SymbolRef, function(compressor) {
if (this.is_undefined) return true;
@@ -1584,7 +1604,7 @@ merge(Compressor.prototype, {
return this.operator == "=" && this.right.is_boolean();
});
def(AST_Sequence, function(){
return this.expressions[this.expressions.length - 1].is_boolean();
return this.tail_node().is_boolean();
});
def(AST_True, return_true);
def(AST_False, return_true);
@@ -1611,7 +1631,7 @@ merge(Compressor.prototype, {
|| this.operator == "=" && this.right.is_number(compressor);
});
def(AST_Sequence, function(compressor){
return this.expressions[this.expressions.length - 1].is_number(compressor);
return this.tail_node().is_number(compressor);
});
def(AST_Conditional, function(compressor){
return this.consequent.is_number(compressor) && this.alternative.is_number(compressor);
@@ -1635,7 +1655,7 @@ merge(Compressor.prototype, {
return (this.operator == "=" || this.operator == "+=") && this.right.is_string(compressor);
});
def(AST_Sequence, function(compressor){
return this.expressions[this.expressions.length - 1].is_string(compressor);
return this.tail_node().is_string(compressor);
});
def(AST_Conditional, function(compressor){
return this.consequent.is_string(compressor) && this.alternative.is_string(compressor);
@@ -2974,7 +2994,7 @@ merge(Compressor.prototype, {
return make_sequence(this, [ expression, property ]);
});
def(AST_Sequence, function(compressor){
var last = this.expressions[this.expressions.length - 1];
var last = this.tail_node();
var expr = last.drop_side_effect_free(compressor);
if (expr === last) return this;
var expressions = this.expressions.slice(0, -1);
@@ -3826,7 +3846,7 @@ merge(Compressor.prototype, {
return make_node(AST_Undefined, self).optimize(compressor);
}
}
if (compressor.option("booleans") && compressor.in_boolean_context()) {
if (compressor.in_boolean_context()) {
switch (self.operator) {
case "!":
if (e instanceof AST_UnaryPrefix && e.operator == "!") {
@@ -3979,7 +3999,7 @@ merge(Compressor.prototype, {
}
break;
}
if (compressor.option("booleans") && self.operator == "+" && compressor.in_boolean_context()) {
if (self.operator == "+" && compressor.in_boolean_context()) {
var ll = self.left.evaluate(compressor);
var rr = self.right.evaluate(compressor);
if (ll && typeof ll == "string") {
@@ -4044,7 +4064,7 @@ merge(Compressor.prototype, {
compressor.warn("Condition left of && always true [{file}:{line},{col}]", self.start);
return maintain_this_binding(compressor.parent(), compressor.self(), self.right).optimize(compressor);
}
if (compressor.option("booleans") && compressor.in_boolean_context()) {
if (compressor.in_boolean_context()) {
var rr = self.right.evaluate(compressor);
if (!rr) {
compressor.warn("Boolean && always false [{file}:{line},{col}]", self.start);
@@ -4067,7 +4087,7 @@ merge(Compressor.prototype, {
compressor.warn("Condition left of || always true [{file}:{line},{col}]", self.start);
return maintain_this_binding(compressor.parent(), compressor.self(), self.left).optimize(compressor);
}
if (compressor.option("booleans") && compressor.in_boolean_context()) {
if (compressor.in_boolean_context()) {
var rr = self.right.evaluate(compressor);
if (!rr) {
compressor.warn("Dropping side-effect-free || in boolean context [{file}:{line},{col}]", self.start);
@@ -4841,7 +4861,7 @@ merge(Compressor.prototype, {
});
function literals_in_boolean_context(self, compressor) {
if (compressor.option("booleans") && compressor.in_boolean_context()) {
if (compressor.in_boolean_context()) {
return best_of(compressor, self, make_sequence(self, [
self,
make_node(AST_True, self)