93 lines
3.3 KiB
JavaScript
93 lines
3.3 KiB
JavaScript
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import {
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AST_Array,
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AST_Chain,
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AST_Constant,
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AST_Dot,
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AST_ImportMeta,
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AST_Node,
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AST_Object,
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AST_ObjectKeyVal,
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AST_PropAccess,
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AST_SymbolDeclaration,
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AST_SymbolRef,
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AST_Toplevel,
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TreeTransformer,
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} from "../ast.js";
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import { make_node, noop, HOP } from "../utils/index.js";
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import { make_node_from_constant } from "./common.js";
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import { is_lhs } from "./inference.js";
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(function(def_find_defs) {
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function to_node(value, orig) {
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if (value instanceof AST_Node) {
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if (!(value instanceof AST_Constant)) {
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// Value may be a function, an array including functions and even a complex assign / block expression,
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// so it should never be shared in different places.
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// Otherwise wrong information may be used in the compression phase
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value = value.clone(true);
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}
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return make_node(value.CTOR, orig, value);
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}
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if (Array.isArray(value)) return make_node(AST_Array, orig, {
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elements: value.map(function(value) {
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return to_node(value, orig);
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})
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});
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if (value && typeof value == "object") {
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var props = [];
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for (var key in value) if (HOP(value, key)) {
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props.push(make_node(AST_ObjectKeyVal, orig, {
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key: key,
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value: to_node(value[key], orig)
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}));
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}
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return make_node(AST_Object, orig, {
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properties: props
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});
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}
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return make_node_from_constant(value, orig);
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}
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AST_Toplevel.DEFMETHOD("resolve_defines", function(compressor) {
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if (!compressor.option("global_defs")) return this;
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this.figure_out_scope({ ie8: compressor.option("ie8") });
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return this.transform(new TreeTransformer(function(node) {
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var def = node._find_defs(compressor, "");
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if (!def) return;
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var level = 0, child = node, parent;
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while (parent = this.parent(level++)) {
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if (!(parent instanceof AST_PropAccess)) break;
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if (parent.expression !== child) break;
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child = parent;
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}
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if (is_lhs(child, parent)) {
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return;
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}
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return def;
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}));
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});
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def_find_defs(AST_Node, noop);
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def_find_defs(AST_Chain, function(compressor, suffix) {
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return this.expression._find_defs(compressor, suffix);
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});
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def_find_defs(AST_Dot, function(compressor, suffix) {
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return this.expression._find_defs(compressor, "." + this.property + suffix);
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});
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def_find_defs(AST_SymbolDeclaration, function() {
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if (!this.global()) return;
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});
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def_find_defs(AST_SymbolRef, function(compressor, suffix) {
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if (!this.global()) return;
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var defines = compressor.option("global_defs");
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var name = this.name + suffix;
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if (HOP(defines, name)) return to_node(defines[name], this);
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});
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def_find_defs(AST_ImportMeta, function(compressor, suffix) {
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var defines = compressor.option("global_defs");
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var name = "import.meta" + suffix;
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if (HOP(defines, name)) return to_node(defines[name], this);
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});
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})(function(node, func) {
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node.DEFMETHOD("_find_defs", func);
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});
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