mirror of
https://github.com/jashkenas/coffeescript.git
synced 2022-11-09 12:23:24 -05:00
trying out a new organizational scheme, with a quickie 'inherits' helper function
This commit is contained in:
Jeremy Ashkenas
parent
aabfba9599
commit
69808ba523
3 changed files with 299 additions and 130 deletions
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@ -1,5 +1,5 @@
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(function(){
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var Expressions, Node, TAB, TRAILING_WHITESPACE, __a, compact, del, dup, flatten, statement;
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var Expressions, LiteralNode, Node, TAB, TRAILING_WHITESPACE, compact, del, dup, flatten, inherit, merge, statement;
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var __hasProp = Object.prototype.hasOwnProperty;
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// The abstract base class for all CoffeeScript nodes.
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// All nodes are implement a "compile_node" method, which performs the
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@ -247,6 +247,21 @@
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return output;
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}
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};
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// Merge objects.
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merge = function merge(src, dest) {
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var __a, __b, key, val;
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dest[key] = (function() {
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__a = []; __b = src;
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for (key in __b) {
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val = __b[key];
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if (__hasProp.call(__b, key)) {
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__a.push(val);
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}
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}
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return __a;
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}).call(this);
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return dest;
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};
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// Delete a key from an object, returning the value.
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del = function del(obj, key) {
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var val;
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@ -254,6 +269,28 @@
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delete obj[key];
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return val;
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};
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// Quickie inheritance convenience wrapper to reduce typing.
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inherit = function inherit(parent, props) {
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var __a, __b, __c, klass, name, prop;
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klass = props.constructor;
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delete props.constructor;
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__a = function(){};
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__a.prototype = parent.prototype;
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klass.__superClass__ = parent.prototype;
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klass.prototype = new __a();
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klass.prototype.constructor = klass;
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klass.prototype[name] = (function() {
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__b = []; __c = props;
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for (name in __c) {
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prop = __c[name];
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if (__hasProp.call(__c, name)) {
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__b.push(prop);
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}
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}
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return __b;
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}).call(this);
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return klass;
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};
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// # Provide a quick implementation of a children method.
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// children: (klass, attrs...) ->
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// klass::children: ->
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@ -261,10 +298,10 @@
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// compact flatten nodes
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// Mark a node as a statement, or a statement only.
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statement = function statement(klass, only) {
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klass.prototype.statement = function statement() {
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klass.prototype.is_statement = function is_statement() {
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return true;
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};
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return klass.prototype.statement_only = function statement_only() {
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return klass.prototype.is_statement_only = function is_statement_only() {
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if (only) {
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return true;
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}
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@ -288,8 +325,8 @@
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});
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this.indent = o.indent;
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top = this.top_sensitive() ? o.top : del(obj('top'));
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closure = this.statement() && !this.statement_only() && !top && !o.returns && !this instanceof CommentNode && !this.contains(function(node) {
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return node.statement_only();
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closure = this.is_statement() && !this.is_statement_only() && !top && !o.returns && !this instanceof CommentNode && !this.contains(function(node) {
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return node.is_statement_only();
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});
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return closure ? this.compile_closure(this.options) : this.compile_node(this.options);
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};
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@ -330,85 +367,144 @@
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return this;
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};
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Node.prototype.children = [];
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Node.prototype.statement = function statement() {
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Node.prototype.is_statement = function is_statement() {
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return false;
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};
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Node.prototype.statement_only = function statement_only() {
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Node.prototype.is_statement_only = function is_statement_only() {
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return false;
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};
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Node.prototype.top_sensitive = function top_sensitive() {
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return false;
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};
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// A collection of nodes, each one representing an expression.
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Expressions = (exports.Expressions = function Expressions() {
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var __a, nodes;
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nodes = Array.prototype.slice.call(arguments, 0);
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this.expressions = flatten(nodes);
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__a = this.children = this.expressions;
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return Expressions === this.constructor ? this : __a;
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});
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__a = function(){};
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__a.prototype = Node.prototype;
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Expressions.__superClass__ = Node.prototype;
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Expressions.prototype = new __a();
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Expressions.prototype.constructor = Expressions;
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statement(Expressions);
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// Wrap up a node as an Expressions, unless it already is.
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Expressions.prototype.wrap = function wrap() {
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var nodes;
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nodes = Array.prototype.slice.call(arguments, 0);
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if (nodes.length === 1 && nodes[0] instanceof Expressions) {
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return nodes[0];
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}
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return new Expressions.apply(this, nodes);
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};
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// Tack an expression on to the end of this expression list.
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Expressions.prototype.push = function push(node) {
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this.expressions.push(node);
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return this;
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};
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// Tack an expression on to the beginning of this expression list.
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Expressions.prototype.unshift = function unshift(node) {
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this.expressions.unshift(node);
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return this;
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};
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// If this Expressions consists of a single node, pull it back out.
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Expressions.prototype.unwrap = function unwrap() {
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return this.expressions.length === 1 ? this.expressions[0] : this;
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};
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// Is this an empty block of code?
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Expressions.prototype.empty = function empty() {
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return this.expressions.length === 0;
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};
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// Is the node last in this block of expressions?
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Expressions.prototype.is_last = function is_last(node) {
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var l;
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l = this.expressions.length;
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this.last_index = this.last_index || this.expressions[l - 1] instanceof CommentNode ? -2 : -1;
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return node === this.expressions[l - this.last_index];
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};
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Expressions.prototype.compile = function compile(o) {
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return o.scope ? Expressions.__superClass__.compile.call(this, o) : this.compile_root(o);
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};
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// Compile each expression in the Expressions body.
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Expressions.prototype.compile_node = function compile_node(o) {
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var __b, __c, __d, node;
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return ((function() {
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__b = []; __c = this.expressions;
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for (__d = 0; __d < __c.length; __d++) {
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node = __c[__d];
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__b.push(this.compile_expression(node, dup(o)));
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Expressions = (exports.Expressions = inherit(Node, {
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constructor: function constructor() {
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var nodes;
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nodes = Array.prototype.slice.call(arguments, 0);
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this.expressions = flatten(nodes);
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return this.children = this.expressions;
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},
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// Wrap up a node as an Expressions, unless it already is.
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wrap: function wrap() {
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var nodes;
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nodes = Array.prototype.slice.call(arguments, 0);
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if (nodes.length === 1 && nodes[0] instanceof Expressions) {
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return nodes[0];
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}
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return __b;
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}).call(this)).join("\n");
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};
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// If this is the top-level Expressions, wrap everything in a safety closure.
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Expressions.prototype.compile_root = function compile_root(o) {
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var code, indent;
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o.indent = (this.indent = (indent = o.no_wrap ? '' : TAB));
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o.scope = new Scope(null, this, null);
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code = o.globals ? this.compile_node(o) : this.compile_with_declarations(o);
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code = code.replace(TRAILING_WHITESPACE, '');
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return o.no_wrap ? code : "(function(){\n" + code + "\n})();";
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return new Expressions.apply(this, nodes);
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},
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// Tack an expression on to the end of this expression list.
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push: function push(node) {
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this.expressions.push(node);
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return this;
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},
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// Tack an expression on to the beginning of this expression list.
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unshift: function unshift(node) {
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this.expressions.unshift(node);
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return this;
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},
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// If this Expressions consists of a single node, pull it back out.
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unwrap: function unwrap() {
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return this.expressions.length === 1 ? this.expressions[0] : this;
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},
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// Is this an empty block of code?
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empty: function empty() {
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return this.expressions.length === 0;
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},
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// Is the node last in this block of expressions?
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is_last: function is_last(node) {
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var l;
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l = this.expressions.length;
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this.last_index = this.last_index || this.expressions[l - 1] instanceof CommentNode ? -2 : -1;
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return node === this.expressions[l - this.last_index];
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},
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compile: function compile(o) {
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return o.scope ? compile.__superClass__.constructor.call(this, o) : this.compile_root(o);
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},
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// Compile each expression in the Expressions body.
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compile_node: function compile_node(o) {
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var __a, __b, __c, node;
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return ((function() {
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__a = []; __b = this.expressions;
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for (__c = 0; __c < __b.length; __c++) {
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node = __b[__c];
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__a.push(this.compile_expression(node, dup(o)));
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}
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return __a;
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}).call(this)).join("\n");
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},
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// If this is the top-level Expressions, wrap everything in a safety closure.
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compile_root: function compile_root(o) {
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var code, indent;
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o.indent = (this.indent = (indent = o.no_wrap ? '' : TAB));
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o.scope = new Scope(null, this, null);
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code = o.globals ? this.compile_node(o) : this.compile_with_declarations(o);
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code = code.replace(TRAILING_WHITESPACE, '');
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return o.no_wrap ? code : "(function(){\n" + code + "\n})();";
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},
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// Compile the expressions body, with declarations of all inner variables
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// pushed up to the top.
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compile_with_declarations: function compile_with_declarations(o) {
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var args, argv, code;
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code = this.compile_node(o);
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args = this.contains(function(node) {
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return node instanceof ValueNode && node.arguments();
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});
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argv = args && o.scope.check('arguments') ? '' : 'var ';
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if (args) {
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code = this.idt() + argv + "arguments = Array.prototype.slice.call(arguments, 0);\n" + code;
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}
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if (o.scope.has_assignments(this)) {
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code = this.idt() + 'var ' + o.scope.compiled_assignments() + ";\n" + code;
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}
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if (o.scope.has_declarations(this)) {
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code = this.idt() + 'var ' + o.scope.compiled_declarations() + ";\n" + code;
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}
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return code;
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},
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// Compiles a single expression within the expressions body.
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compile_expression: function compile_expression(node, o) {
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var returns, stmt, temp;
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this.indent = o.indent;
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stmt = node.is_statement();
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// We need to return the result if this is the last node in the expressions body.
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returns = o.returns && this.is_last(node) && !node.is_statement_only();
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delete o.returns;
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// Return the regular compile of the node, unless we need to return the result.
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if (!(returns)) {
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return (stmt ? '' : this.idt()) + node.compile(merge(o, {
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top: true
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})) + (stmt ? '' : ';');
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}
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// If it's a statement, the node knows how to return itself.
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if (node.is_statement()) {
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return node.compile(merge(o, {
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returns: true
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}));
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}
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// If it's not part of a constructor, we can just return the value of the expression.
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if (!((o.scope.function == undefined ? undefined : o.scope.function.is_constructor()))) {
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return this.idt() + 'return ' + node.compile(o);
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}
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// It's the last line of a constructor, add a safety check.
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temp = o.scope.free_variable();
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return this.idt() + temp + ' = ' + node.compile(o) + ";\n" + this.idt() + "return " + o.scope.function.name + ' === this.constructor ? this : ' + temp + ';';
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}
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}));
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statement(Expressions);
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// Literals are static values that can be passed through directly into
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// JavaScript without translation, eg.: strings, numbers, true, false, null...
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LiteralNode = (exports.LiteralNode = function LiteralNode(value) {
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var __a;
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this.value = value;
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__a = this.children = [value];
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return LiteralNode === this.constructor ? this : __a;
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});
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// Break and continue must be treated as statements -- they lose their meaning
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// when wrapped in a closure.
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LiteralNode.prototype.is_statement = function is_statement() {
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return this.value === 'break' || this.value === 'continue';
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};
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LiteralNode.prototype.is_statement_only = LiteralNode.prototype.is_statement;
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LiteralNode.prototype.compile_node = function compile_node(o) { };
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})();
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@ -150,7 +150,7 @@ module CoffeeScript
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end
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# Compile the expressions body, with declarations of all inner variables
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# at the top.
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# pushed up to the top.
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def compile_with_declarations(o={})
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code = compile_node(o)
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args = self.contains? {|n| n.is_a?(ValueNode) && n.arguments? }
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@ -161,7 +161,7 @@ module CoffeeScript
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write(code)
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end
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# Compiles a single expression within the expression list.
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# Compiles a single expression within the expressions body.
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def compile_expression(node, o)
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@indent = o[:indent]
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stmt = node.statement?
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177
src/nodes.coffee
177
src/nodes.coffee
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@ -63,12 +63,25 @@ dup: (input) ->
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(output[key]: val) for key, val of input
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output
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# Merge objects.
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merge: (src, dest) ->
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dest[key]: val for key, val of src
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dest
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# Delete a key from an object, returning the value.
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del: (obj, key) ->
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val: obj[key]
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delete obj[key]
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val
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# Quickie inheritance convenience wrapper to reduce typing.
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inherit: (parent, props) ->
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klass: props.constructor
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delete props.constructor
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klass extends parent
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klass.prototype[name]: prop for name, prop of props
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klass
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# # Provide a quick implementation of a children method.
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# children: (klass, attrs...) ->
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# klass::children: ->
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@ -77,8 +90,8 @@ del: (obj, key) ->
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# Mark a node as a statement, or a statement only.
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statement: (klass, only) ->
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klass::statement: -> true
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klass::statement_only: -> true if only
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klass::is_statement: -> true
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klass::is_statement_only: -> true if only
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# The abstract base class for all CoffeeScript nodes.
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@ -98,9 +111,9 @@ Node::compile: (o) ->
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@options: dup(o || {})
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@indent: o.indent
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top: if @top_sensitive() then o.top else del obj 'top'
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closure: @statement() and not @statement_only() and not top and
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closure: @is_statement() and not @is_statement_only() and not top and
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not o.returns and not this instanceof CommentNode and
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not @contains (node) -> node.statement_only()
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not @contains (node) -> node.is_statement_only()
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if closure then @compile_closure(@options) else @compile_node(@options)
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# Statements converted into expressions share scope with their parent
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@ -124,64 +137,124 @@ Node::contains: (block) ->
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false
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# Default implementations of the common node methods.
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Node::unwrap: -> this
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Node::children: []
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Node::statement: -> false
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Node::statement_only: -> false
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Node::top_sensitive: -> false
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Node::unwrap: -> this
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Node::children: []
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Node::is_statement: -> false
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Node::is_statement_only: -> false
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Node::top_sensitive: -> false
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# A collection of nodes, each one representing an expression.
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Expressions: exports.Expressions: (nodes...) ->
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@expressions: flatten nodes
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@children: @expressions
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Expressions: exports.Expressions: inherit Node, {
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constructor: (nodes...) ->
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@expressions: flatten nodes
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@children: @expressions
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# Wrap up a node as an Expressions, unless it already is.
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wrap: (nodes...) ->
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return nodes[0] if nodes.length is 1 and nodes[0] instanceof Expressions
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new Expressions(nodes...)
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# Tack an expression on to the end of this expression list.
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push: (node) ->
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@expressions.push(node)
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this
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# Tack an expression on to the beginning of this expression list.
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unshift: (node) ->
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@expressions.unshift(node)
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this
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# If this Expressions consists of a single node, pull it back out.
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unwrap: ->
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if @expressions.length is 1 then @expressions[0] else this
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# Is this an empty block of code?
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empty: ->
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@expressions.length is 0
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# Is the node last in this block of expressions?
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is_last: (node) ->
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l: @expressions.length
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@last_index ||= if @expressions[l - 1] instanceof CommentNode then -2 else -1
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node is @expressions[l - @last_index]
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compile: (o) ->
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if o.scope then super(o) else @compile_root(o)
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# Compile each expression in the Expressions body.
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compile_node: (o) ->
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(@compile_expression(node, dup(o)) for node in @expressions).join("\n")
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# If this is the top-level Expressions, wrap everything in a safety closure.
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compile_root: (o) ->
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o.indent: @indent: indent: if o.no_wrap then '' else TAB
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o.scope: new Scope(null, this, null)
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code: if o.globals then @compile_node(o) else @compile_with_declarations(o)
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code: code.replace(TRAILING_WHITESPACE, '')
|
||||
if o.no_wrap then code else "(function(){\n"+code+"\n})();"
|
||||
|
||||
# Compile the expressions body, with declarations of all inner variables
|
||||
# pushed up to the top.
|
||||
compile_with_declarations: (o) ->
|
||||
code: @compile_node(o)
|
||||
args: @contains (node) -> node instanceof ValueNode and node.arguments()
|
||||
argv: if args and o.scope.check('arguments') then '' else 'var '
|
||||
code: @idt() + argv + "arguments = Array.prototype.slice.call(arguments, 0);\n" + code if args
|
||||
code: @idt() + 'var ' + o.scope.compiled_assignments() + ";\n" + code if o.scope.has_assignments(this)
|
||||
code: @idt() + 'var ' + o.scope.compiled_declarations() + ";\n" + code if o.scope.has_declarations(this)
|
||||
code
|
||||
|
||||
# Compiles a single expression within the expressions body.
|
||||
compile_expression: (node, o) ->
|
||||
@indent: o.indent
|
||||
stmt: node.is_statement()
|
||||
# We need to return the result if this is the last node in the expressions body.
|
||||
returns: o.returns and @is_last(node) and not node.is_statement_only()
|
||||
delete o.returns
|
||||
# Return the regular compile of the node, unless we need to return the result.
|
||||
return (if stmt then '' else @idt()) + node.compile(merge(o, {top: true})) + (if stmt then '' else ';') unless returns
|
||||
# If it's a statement, the node knows how to return itself.
|
||||
return node.compile(merge(o, {returns: true})) if node.is_statement()
|
||||
# If it's not part of a constructor, we can just return the value of the expression.
|
||||
return @idt() + 'return ' + node.compile(o) unless o.scope.function?.is_constructor()
|
||||
# It's the last line of a constructor, add a safety check.
|
||||
temp: o.scope.free_variable()
|
||||
@idt() + temp + ' = ' + node.compile(o) + ";\n" + @idt() + "return " + o.scope.function.name + ' === this.constructor ? this : ' + temp + ';'
|
||||
}
|
||||
|
||||
Expressions extends Node
|
||||
statement Expressions
|
||||
|
||||
# Wrap up a node as an Expressions, unless it already is.
|
||||
Expressions::wrap: (nodes...) ->
|
||||
return nodes[0] if nodes.length is 1 and nodes[0] instanceof Expressions
|
||||
new Expressions(nodes...)
|
||||
|
||||
# Tack an expression on to the end of this expression list.
|
||||
Expressions::push: (node) ->
|
||||
@expressions.push(node)
|
||||
this
|
||||
# Literals are static values that can be passed through directly into
|
||||
# JavaScript without translation, eg.: strings, numbers, true, false, null...
|
||||
LiteralNode: exports.LiteralNode: (value) ->
|
||||
@value: value
|
||||
@children: [value]
|
||||
|
||||
# Break and continue must be treated as statements -- they lose their meaning
|
||||
# when wrapped in a closure.
|
||||
LiteralNode::is_statement: ->
|
||||
@value is 'break' or @value is 'continue'
|
||||
|
||||
LiteralNode::is_statement_only: LiteralNode::is_statement
|
||||
|
||||
LiteralNode::compile_node: (o) ->
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
# Tack an expression on to the beginning of this expression list.
|
||||
Expressions::unshift: (node) ->
|
||||
@expressions.unshift(node)
|
||||
this
|
||||
|
||||
# If this Expressions consists of a single node, pull it back out.
|
||||
Expressions::unwrap: ->
|
||||
if @expressions.length is 1 then @expressions[0] else this
|
||||
|
||||
# Is this an empty block of code?
|
||||
Expressions::empty: ->
|
||||
@expressions.length is 0
|
||||
|
||||
# Is the node last in this block of expressions?
|
||||
Expressions::is_last: (node) ->
|
||||
l: @expressions.length
|
||||
@last_index ||= if @expressions[l - 1] instanceof CommentNode then -2 else -1
|
||||
node is @expressions[l - @last_index]
|
||||
|
||||
Expressions::compile: (o) ->
|
||||
if o.scope then super(o) else @compile_root(o)
|
||||
|
||||
# Compile each expression in the Expressions body.
|
||||
Expressions::compile_node: (o) ->
|
||||
(@compile_expression(node, dup(o)) for node in @expressions).join("\n")
|
||||
|
||||
# If this is the top-level Expressions, wrap everything in a safety closure.
|
||||
Expressions::compile_root: (o) ->
|
||||
o.indent: @indent: indent: if o.no_wrap then '' else TAB
|
||||
o.scope: new Scope(null, this, null)
|
||||
code: if o.globals then @compile_node(o) else @compile_with_declarations(o)
|
||||
code: code.replace(TRAILING_WHITESPACE, '')
|
||||
if o.no_wrap then code else "(function(){\n"+code+"\n})();"
|
||||
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue