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https://github.com/jashkenas/coffeescript.git
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Self-compiler: array slice literals.
This commit is contained in:
Jeremy Ashkenas
@@ -38,7 +38,6 @@ exports.IfNode : -> @name: this.constructor.name; @values: arguments
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exports.Expressions.wrap : (values) -> @values: values
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# Some helper functions
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# Tabs are two spaces for pretty printing.
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@@ -101,7 +100,6 @@ statement: (klass, 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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# All nodes are implement a "compile_node" method, which performs the
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# code generation for that node. To compile a node, call the "compile"
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@@ -151,7 +149,6 @@ 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: inherit Node, {
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@@ -233,7 +230,6 @@ Expressions.wrap: (nodes) ->
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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: inherit Node, {
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@@ -257,7 +253,6 @@ LiteralNode: exports.LiteralNode: inherit Node, {
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LiteralNode::is_statement_only: LiteralNode::is_statement
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# Return an expression, or wrap it in a closure and return it.
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ReturnNode: exports.ReturnNode: inherit Node, {
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@@ -274,7 +269,6 @@ ReturnNode: exports.ReturnNode: inherit Node, {
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statement ReturnNode, true
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# A value, indexed or dotted into, or vanilla.
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ValueNode: exports.ValueNode: inherit Node, {
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@@ -341,7 +335,6 @@ ValueNode: exports.ValueNode: inherit Node, {
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}
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# Pass through CoffeeScript comments into JavaScript comments at the
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# same position.
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CommentNode: exports.CommentNode: inherit Node, {
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@@ -358,7 +351,6 @@ CommentNode: exports.CommentNode: inherit Node, {
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statement CommentNode
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# Node for a function invocation. Takes care of converting super() calls into
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# calls against the prototype's function of the same name.
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CallNode: exports.CallNode: inherit Node, {
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@@ -415,7 +407,6 @@ CallNode: exports.CallNode: inherit Node, {
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}
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# Node to extend an object's prototype with an ancestor object.
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# After goog.inherits from the Closure Library.
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ExtendsNode: exports.ExtendsNode: inherit Node, {
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@@ -441,7 +432,6 @@ ExtendsNode: exports.ExtendsNode: inherit Node, {
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statement ExtendsNode
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# A dotted accessor into a part of a value, or the :: shorthand for
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# an accessor into the object's prototype.
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AccessorNode: exports.AccessorNode: inherit Node, {
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@@ -458,7 +448,6 @@ AccessorNode: exports.AccessorNode: inherit Node, {
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}
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# An indexed accessor into a part of an array or object.
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IndexNode: exports.IndexNode: inherit Node, {
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@@ -471,18 +460,82 @@ IndexNode: exports.IndexNode: inherit Node, {
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}
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# A this-reference, using '@'.
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ThisNode: exports.ThisNode: inherit Node, {
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constructor: (property) ->
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@property: property or null
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this
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compile_node: (o) ->
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'this' + (if @property then '.' + @property else '')
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}
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# A range literal. Ranges can be used to extract portions (slices) of arrays,
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# or to specify a range for list comprehensions.
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RangeNode: exports.RangeNode: inherit Node, {
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constructor: (from, to, exclusive) ->
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@from: from
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@to: to
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@children: [from, to]
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@exclusive: !!exclusive
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this
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compile_variables: (o) ->
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@indent: o.indent
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@from_var: o.scope.free_variable()
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@to_var: o.scope.free_variable()
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@from_var + ' = ' + @from.compile(o) + '; ' + @to_var + ' = ' + @to.compile(o) + ";\n" + @idt()
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compile_node: (o) ->
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return @compile_array(o) unless o.index
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idx: del o, 'index'
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step: del o, 'step'
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equals: if @exclusive then '' else '='
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intro: '(' + @from_var + ' <= ' + @to_var + ' ? ' + idx
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compare: intro + ' <' + equals + ' ' + @to_var + ' : ' + idx + ' >' + equals + ' ' + @to_var + ')'
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incr: intro + ' += ' + step + ' : ' + idx + ' -= ' + step + ')'
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vars + '; ' + compare + '; ' + incr
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# Expand the range into the equivalent array, if it's not being used as
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# part of a comprehension, slice, or splice.
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# TODO: This generates pretty ugly code ... shrink it.
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compile_array: (o) ->
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body: Expressions.wrap(new LiteralNode 'i')
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arr: Expressions.wrap(new ForNode(body, {source: (new ValueNode(this))}, 'i'))
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(new ParentheticalNode(new CallNode(new CodeNode([], arr)))).compile(o)
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}
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# An array slice literal. Unlike JavaScript's Array#slice, the second parameter
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# specifies the index of the end of the slice (just like the first parameter)
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# is the index of the beginning.
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SliceNode: exports.SliceNode: inherit Node, {
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constructor: (range) ->
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@children: [@range: range]
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this
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compile_node: (o) ->
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from: @range.from.compile(o)
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to: @range.to.compile(o)
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plus_part: if @range.exclusive then '' else ' + 1'
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".slice(" + from + ', ' + to + plus_part + ')'
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}
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