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| module.exports = Scope;
var traverse = require("./index");
var t = require("../types");
var _ = require("lodash");
var FOR_KEYS = ["left", "init"];
/**
* This searches the current "scope" and collects all references/declarations
* within.
*
* @param {Node} block
* @param {Scope} [parent]
*/
function Scope(block, parent) {
this.parent = parent;
this.block = block;
var info = this.getInfo();
this.references = info.references;
this.declarations = info.declarations;
}
var vars = require("jshint/src/vars");
Scope.defaultDeclarations = _.flatten([
vars.newEcmaIdentifiers,
vars.node,
vars.ecmaIdentifiers,
vars.reservedVars
].map(_.keys));
Scope.add = function (node, references) {
if (!node) return;
_.defaults(references, t.getIds(node, true));
};
/**
* Description
*
* @param {File} file
* @param {String} [name="temp"]
*/
Scope.prototype.generateTemp = function (file, name) {
var id = file.generateUidIdentifier(name || "temp", this);
this.push({
key: id.name,
id: id
});
return id;
};
/*
* Description
*
* @param {Object} parent
* @param {File} file
* @param {Scope} scope
* @returns {Object}
*/
Scope.prototype.generateUidBasedOnNode = function (parent, file) {
var node = parent;
if (t.isAssignmentExpression(parent)) {
node = parent.left;
} else if (t.isVariableDeclarator(parent)) {
node = parent.id;
} else Iif (t.isProperty(node)) {
node = node.key;
}
var parts = [];
var add = function (node) {
if (t.isMemberExpression(node)) {
add(node.object);
add(node.property);
} else if (t.isIdentifier(node)) {
parts.push(node.name);
} else if (t.isLiteral(node)) {
parts.push(node.value);
} else if (t.isCallExpression(node)) {
add(node.callee);
}
};
add(node);
var id = parts.join("$");
id = id.replace(/^_/, "") || "ref";
return file.generateUidIdentifier(id, this);
};
/**
* Description
*
* @param {Object} node
* @param {File} file
* @returns {Object}
*/
Scope.prototype.generateTempBasedOnNode = function (node, file) {
if (t.isIdentifier(node) && this.has(node.name, true)) {
return null;
}
var id = this.generateUidBasedOnNode(node, file);
this.push({
key: id.name,
id: id
});
return id;
};
Scope.prototype.getInfo = function () {
var block = this.block;
if (block._scopeInfo) return block._scopeInfo;
var info = block._scopeInfo = {};
var references = info.references = {};
var declarations = info.declarations = {};
var add = function (node, reference) {
Scope.add(node, references);
if (!reference) Scope.add(node, declarations);
};
// ForStatement - left, init
if (t.isFor(block)) {
_.each(FOR_KEYS, function (key) {
var node = block[key];
if (t.isLet(node)) add(node);
});
block = block.body;
}
// Program, BlockStatement - let variables
if (t.isBlockStatement(block) || t.isProgram(block)) {
_.each(block.body, function (node) {
// check for non-var `VariableDeclaration`s
if (t.isLet(node)) add(node);
});
}
// CatchClause - param
if (t.isCatchClause(block)) {
add(block.param);
}
// Program, Function - var variables
if (t.isProgram(block) || t.isFunction(block)) {
traverse(block, {
enter: function (node, parent, scope) {
if (t.isFor(node)) {
_.each(FOR_KEYS, function (key) {
var declar = node[key];
if (t.isVar(declar)) add(declar);
});
}
// this block is a function so we'll stop since none of the variables
// declared within are accessible
if (t.isFunction(node)) return this.skip();
// function identifier doesn't belong to this scope
if (block.id && node === block.id) return;
if (t.isIdentifier(node) && t.isReferenced(node, parent) && !scope.has(node.name)) {
add(node, true);
}
// we've ran into a declaration!
// we'll let the BlockStatement scope deal with `let` declarations unless
if (t.isDeclaration(node) && !t.isLet(node)) {
add(node);
}
}
}, this);
}
// Function - params, rest
if (t.isFunction(block)) {
add(block.rest);
_.each(block.params, function (param) {
add(param);
});
}
return info;
};
/**
* Description
*
* @param {Object} opts
*/
Scope.prototype.push = function (opts) {
var block = this.block;
Iif (t.isFor(block) || t.isCatchClause(block) || t.isFunction(block)) {
t.ensureBlock(block);
block = block.body;
}
Eif (t.isBlockStatement(block) || t.isProgram(block)) {
block._declarations = block._declarations || {};
block._declarations[opts.key] = {
kind: opts.kind,
id: opts.id,
init: opts.init
};
} else {
throw new TypeError("cannot add a declaration here in node type " + block.type);
}
};
/**
* Description
*
* @param {Object} node
*/
Scope.prototype.add = function (node) {
Scope.add(node, this.references);
};
/**
* Description
*
* @param {String} [id]
* @param {Boolean} [decl]
*/
Scope.prototype.get = function (id, decl) {
return id && (this.getOwn(id, decl) || this.parentGet(id, decl));
};
/**
* Description
*
* @param {String} [id]
* @param {Boolean} [decl]
*/
Scope.prototype.getOwn = function (id, decl) {
var refs = this.references;
if (decl) refs = this.declarations;
return _.has(refs, id) && refs[id];
};
/**
* Description
*
* @param {String} [id]
* @param {Boolean} [decl]
*/
Scope.prototype.parentGet = function (id, decl) {
return this.parent && this.parent.get(id, decl);
};
/**
* Description
*
* @param {String} [id]
* @param {Boolean} [decl]
* @returns {Boolean}
*/
Scope.prototype.has = function (id, decl) {
return (id && (this.hasOwn(id, decl) || this.parentHas(id, decl))) ||
_.contains(Scope.defaultDeclarations, id);
};
/**
* Description
*
* @param {String} [id]
* @param {Boolean} [decl]
* @returns {Boolean}
*/
Scope.prototype.hasOwn = function (id, decl) {
return !!this.getOwn(id, decl);
};
/**
* Description
*
* @param {String} [id]
* @param {Boolean} [decl]
* @returns {Boolean}
*/
Scope.prototype.parentHas = function (id, decl) {
return this.parent && this.parent.has(id, decl);
};
|