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Self-compiler: object literals.

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This commit is contained in:
Jeremy Ashkenas
2010-02-09 20:53:25 -05:00
parent 91a7102f11
commit 001c915c21
7 changed files with 403 additions and 175 deletions
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168
lib/coffee_script/nodes.rb
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@@ -499,6 +499,75 @@ module CoffeeScript
end
end
# An object literal.
class ObjectNode < Node
children :properties
alias_method :objects, :properties
def initialize(properties = [])
@properties = properties
end
# All the mucking about with commas is to make sure that CommentNodes and
# AssignNodes get interleaved correctly, with no trailing commas or
# commas affixed to comments. TODO: Extract this and add it to ArrayNode.
def compile_node(o)
o[:indent] = idt(1)
joins = Hash.new("\n")
non_comments = @properties.select {|p| !p.is_a?(CommentNode) }
non_comments.each {|p| joins[p] = p == non_comments.last ? "\n" : ",\n" }
props = @properties.map { |prop|
join = joins[prop]
join = '' if prop == @properties.last
indent = prop.is_a?(CommentNode) ? '' : idt(1)
"#{indent}#{prop.compile(o)}#{join}"
}.join('')
write("{\n#{props}\n#{idt}}")
end
end
# An array literal.
class ArrayNode < Node
children :objects
def initialize(objects=[])
@objects = objects
end
def compile_node(o)
o[:indent] = idt(1)
objects = @objects.map { |obj|
code = obj.compile(o)
obj.is_a?(CommentNode) ? "\n#{code}\n#{o[:indent]}" :
obj == @objects.last ? code : "#{code}, "
}.join('')
ending = objects.include?("\n") ? "\n#{idt}]" : ']'
write("[#{objects}#{ending}")
end
end
# A faux-node that is never created by the grammar, but is used during
# code generation to generate a quick "array.push(value)" tree of nodes.
class PushNode
def self.wrap(array, expressions)
expr = expressions.unwrap
return expressions if expr.statement_only? || expr.contains? {|n| n.statement_only? }
Expressions.wrap(CallNode.new(
ValueNode.new(LiteralNode.new(array), [AccessorNode.new(Value.new('push'))]),
[expr]
))
end
end
# A faux-node used to wrap an expressions body in a closure.
class ClosureNode
def self.wrap(expressions, statement=false)
func = ParentheticalNode.new(CodeNode.new([], Expressions.wrap(expressions)))
call = CallNode.new(ValueNode.new(func, AccessorNode.new(Value.new('call'))), [Value.new('this')])
statement ? Expressions.wrap(call) : call
end
end
# Setting the value of a local variable, or the value of an object property.
class AssignNode < Node
top_sensitive
@@ -511,14 +580,22 @@ module CoffeeScript
@variable, @value, @context = variable, value, context
end
def value?
@variable.is_a?(ValueNode)
end
def statement?
value? && (@variable.array? || @variable.object?)
end
def compile_node(o)
top = o.delete(:top)
return compile_pattern_match(o) if statement?
return compile_splice(o) if value? && @variable.splice?
stmt = o.delete(:as_statement)
name = @variable.compile(o)
last = value? ? @variable.last.to_s.sub(LEADING_DOT, '') : name
proto = name[PROTO_ASSIGN, 1]
top = o.delete(:top)
return compile_pattern_match(o) if statement?
return compile_splice(o) if value? && @variable.splice?
stmt = o.delete(:as_statement)
name = @variable.compile(o)
last = value? ? @variable.last.to_s.sub(LEADING_DOT, '') : name
proto = name[PROTO_ASSIGN, 1]
if @value.is_a?(CodeNode)
@value.name = last if last.match(Lexer::IDENTIFIER)
@value.proto = proto if proto
@@ -532,14 +609,6 @@ module CoffeeScript
write(val)
end
def value?
@variable.is_a?(ValueNode)
end
def statement?
value? && (@variable.array? || @variable.object?)
end
# Implementation of recursive pattern matching, when assigning array or
# object literals to a value. Peeks at their properties to assign inner names.
# See: http://wiki.ecmascript.org/doku.php?id=harmony:destructuring
@@ -710,75 +779,6 @@ module CoffeeScript
end
# An object literal.
class ObjectNode < Node
children :properties
alias_method :objects, :properties
def initialize(properties = [])
@properties = properties
end
# All the mucking about with commas is to make sure that CommentNodes and
# AssignNodes get interleaved correctly, with no trailing commas or
# commas affixed to comments. TODO: Extract this and add it to ArrayNode.
def compile_node(o)
o[:indent] = idt(1)
joins = Hash.new("\n")
non_comments = @properties.select {|p| !p.is_a?(CommentNode) }
non_comments.each {|p| joins[p] = p == non_comments.last ? "\n" : ",\n" }
props = @properties.map { |prop|
join = joins[prop]
join = '' if prop == @properties.last
indent = prop.is_a?(CommentNode) ? '' : idt(1)
"#{indent}#{prop.compile(o)}#{join}"
}.join('')
write("{\n#{props}\n#{idt}}")
end
end
# An array literal.
class ArrayNode < Node
children :objects
def initialize(objects=[])
@objects = objects
end
def compile_node(o)
o[:indent] = idt(1)
objects = @objects.map { |obj|
code = obj.compile(o)
obj.is_a?(CommentNode) ? "\n#{code}\n#{o[:indent]}" :
obj == @objects.last ? code : "#{code}, "
}.join('')
ending = objects.include?("\n") ? "\n#{idt}]" : ']'
write("[#{objects}#{ending}")
end
end
# A faux-node that is never created by the grammar, but is used during
# code generation to generate a quick "array.push(value)" tree of nodes.
class PushNode
def self.wrap(array, expressions)
expr = expressions.unwrap
return expressions if expr.statement_only? || expr.contains? {|n| n.statement_only? }
Expressions.wrap(CallNode.new(
ValueNode.new(LiteralNode.new(array), [AccessorNode.new(Value.new('push'))]),
[expr]
))
end
end
# A faux-node used to wrap an expressions body in a closure.
class ClosureNode
def self.wrap(expressions, statement=false)
func = ParentheticalNode.new(CodeNode.new([], Expressions.wrap(expressions)))
call = CallNode.new(ValueNode.new(func, AccessorNode.new(Value.new('call'))), [Value.new('this')])
statement ? Expressions.wrap(call) : call
end
end
# A while loop, the only sort of low-level loop exposed by CoffeeScript. From
# it, all other loops can be manufactured.
class WhileNode < Node