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add missing LHS cases which global_defs should avoid

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This commit is contained in:
alexlamsl
2017-01-17 17:33:40 +08:00
committed by Richard van Velzen
parent ec2e5fa3a2
commit 48284844a4
3 changed files with 30 additions and 15 deletions
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13
lib/compress.js
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@@ -970,6 +970,11 @@ merge(Compressor.prototype, {
node.DEFMETHOD("is_string", func);
});
function isLHS(node, parent) {
return parent instanceof AST_Unary && (parent.operator === "++" || parent.operator === "--")
|| parent instanceof AST_Assign && parent.left === node;
}
function best_of(ast1, ast2) {
return ast1.print_to_string().length >
ast2.print_to_string().length
@@ -2608,14 +2613,6 @@ merge(Compressor.prototype, {
});
OPT(AST_SymbolRef, function(self, compressor){
function isLHS(symbol, parent) {
return (
parent instanceof AST_Binary &&
parent.operator === '=' &&
parent.left === symbol
);
}
if (self.undeclared() && !isLHS(self, compressor.parent())) {
var defines = compressor.option("global_defs");
if (defines && HOP(defines, self.name)) {

2
lib/scope.js
View File

@@ -220,7 +220,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
sym = g;
}
node.thedef = sym;
if (parent instanceof AST_Unary && (parent.operator === '++' || parent.operator === '--')
if (parent instanceof AST_Unary && (parent.operator === "++" || parent.operator === "--")
|| parent instanceof AST_Assign && parent.left === node) {
sym.modified = true;
}

30
test/compress/issue-208.js
View File

@@ -1,11 +1,29 @@
do_not_update_lhs: {
options = { global_defs: { DEBUG: false } };
input: { DEBUG = false; }
expect: { DEBUG = false; }
options = {
global_defs: { DEBUG: 0 }
}
input: {
DEBUG++;
DEBUG += 1;
DEBUG = 1;
}
expect: {
DEBUG++;
DEBUG += 1;
DEBUG = 1;
}
}
do_update_rhs: {
options = { global_defs: { DEBUG: false } };
input: { MY_DEBUG = DEBUG; }
expect: { MY_DEBUG = false; }
options = {
global_defs: { DEBUG: 0 }
}
input: {
MY_DEBUG = DEBUG;
MY_DEBUG += DEBUG;
}
expect: {
MY_DEBUG = 0;
MY_DEBUG += 0;
}
}