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renamed Nodes to Expressions

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This commit is contained in:
Jeremy Ashkenas 2009-12-17 22:58:40 -05:00
parent d124f7fc0d
commit 83944950ac
2 changed files with 21 additions and 20 deletions
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16
lib/coffee_script/grammar.y
View file

@ -40,14 +40,14 @@ rule
# All parsing will end in this rule, being the trunk of the AST.
Root:
/* nothing */ { result = Nodes.new([]) }
| Terminator { result = Nodes.new([]) }
/* nothing */ { result = Expressions.new([]) }
| Terminator { result = Expressions.new([]) }
| Expressions { result = val[0] }
;
# Any list of expressions or method body, seperated by line breaks or semis.
Expressions:
Expression { result = Nodes.new(val) }
Expression { result = Expressions.new(val) }
| Expressions Terminator Expression { result = val[0] << val[2] }
| Expressions Terminator { result = val[0] }
| Terminator Expressions { result = val[1] }
@ -158,7 +158,7 @@ rule
# The body of a function.
CodeBody:
/* nothing */ { result = Nodes.new([]) }
/* nothing */ { result = Expressions.new([]) }
| Expressions { result = val[0] }
;
@ -245,8 +245,8 @@ rule
| IF Expression
Then Expressions
ELSE Expressions "." { result = IfNode.new(val[1], val[3], val[5]) }
| Expression IF Expression { result = IfNode.new(val[2], Nodes.new([val[0]])) }
| Expression UNLESS Expression { result = IfNode.new(val[2], Nodes.new([val[0]]), nil, :invert) }
| Expression IF Expression { result = IfNode.new(val[2], Expressions.new([val[0]])) }
| Expression UNLESS Expression { result = IfNode.new(val[2], Expressions.new([val[0]]), nil, :invert) }
;
# Try/catch/finally exception handling blocks.
@ -285,11 +285,11 @@ rule
IN Expression "." { result = ForNode.new(val[0], val[6], val[2], val[4]) }
| Expression FOR IDENTIFIER
IN Expression
IF Expression "." { result = ForNode.new(IfNode.new(val[6], Nodes.new([val[0]])), val[4], val[2]) }
IF Expression "." { result = ForNode.new(IfNode.new(val[6], Expressions.new([val[0]])), val[4], val[2]) }
| Expression FOR
IDENTIFIER "," IDENTIFIER
IN Expression
IF Expression "." { result = ForNode.new(IfNode.new(val[8], Nodes.new([val[0]])), val[6], val[2], val[4]) }
IF Expression "." { result = ForNode.new(IfNode.new(val[8], Expressions.new([val[0]])), val[6], val[2], val[4]) }
;
# Switch/Case blocks.

23
lib/coffee_script/nodes.rb
View file

@ -1,5 +1,6 @@
module CoffeeScript
# The abstract base class for all CoffeeScript nodes.
class Node
# Tabs are two spaces for pretty-printing.
TAB = ' '
@ -13,25 +14,25 @@ module CoffeeScript
def compile(indent='', scope=nil, opts={}); end
end
# Collection of nodes each one representing an expression.
class Nodes < Node
attr_reader :nodes
# A collection of nodes, each one representing an expression.
class Expressions < Node
attr_reader :expressions
def self.wrap(node)
node.is_a?(Nodes) ? node : Nodes.new([node])
node.is_a?(Expressions) ? node : Expressions.new([node])
end
def initialize(nodes)
@nodes = nodes
@expressions = nodes
end
def <<(node)
@nodes << node
@expressions << node
self
end
def flatten
@nodes.length == 1 ? @nodes.first : self
@expressions.length == 1 ? @expressions.first : self
end
def begin_compile
@ -46,8 +47,8 @@ module CoffeeScript
# inner statements (to make expressions out of them).
def compile(indent='', scope=nil, opts={})
return begin_compile unless scope
@nodes.map { |n|
if opts[:return] && n == @nodes.last
@expressions.map { |n|
if opts[:return] && n == @expressions.last
if n.statement? || n.custom_return?
"#{indent}#{n.compile(indent, scope, opts)}#{n.line_ending}"
else
@ -458,8 +459,8 @@ module CoffeeScript
end
def compile_statement(indent, scope, opts)
if_part = "if (#{@condition.compile(indent, scope, :no_paren => true)}) {\n#{Nodes.wrap(@body).compile(indent + TAB, scope, opts)}\n#{indent}}"
else_part = @else_body ? " else {\n#{Nodes.wrap(@else_body).compile(indent + TAB, scope, opts)}\n#{indent}}" : ''
if_part = "if (#{@condition.compile(indent, scope, :no_paren => true)}) {\n#{Expressions.wrap(@body).compile(indent + TAB, scope, opts)}\n#{indent}}"
else_part = @else_body ? " else {\n#{Expressions.wrap(@else_body).compile(indent + TAB, scope, opts)}\n#{indent}}" : ''
if_part + else_part
end