Comprehensions over break and continue
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34b16699fa
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21
lib/nodes.js
21
lib/nodes.js
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@ -210,7 +210,7 @@
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for (_i = 0, _len = _ref.length; _i < _len; _i++) {
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exp = _ref[_i];
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if (exp.jumps(o)) {
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return true;
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return exp;
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}
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}
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};
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@ -338,7 +338,11 @@
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if ((_ref = this.value) !== 'break' && _ref !== 'continue' && _ref !== 'debugger') {
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return false;
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}
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return !(o && (o.loop || o.block && (this.value !== 'continue')));
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if (!(o && (o.loop || o.block && (this.value !== 'continue')))) {
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return this;
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} else {
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return false;
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}
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};
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Literal.prototype.compile = function() {
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if (this.value.reserved) {
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@ -360,7 +364,7 @@
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Return.prototype.children = ['expression'];
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Return.prototype.isStatement = YES;
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Return.prototype.makeReturn = THIS;
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Return.prototype.jumps = YES;
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Return.prototype.jumps = THIS;
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Return.prototype.compile = function(o, level) {
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var expr, _ref;
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expr = (_ref = this.expression) != null ? _ref.makeReturn() : void 0;
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@ -1445,7 +1449,7 @@
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if (node.jumps({
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loop: true
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})) {
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return true;
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return node;
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}
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}
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return false;
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@ -1795,6 +1799,9 @@
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var body, defPart, forPart, guardPart, idt1, index, ivar, lastJumps, lvar, name, namePart, ref, resultPart, returnResult, rvar, scope, source, stepPart, svar, varPart, _ref;
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body = Expressions.wrap([this.body]);
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lastJumps = (_ref = last(body.expressions)) != null ? _ref.jumps() : void 0;
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if (lastJumps && lastJumps instanceof Return) {
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this.returns = false;
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}
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source = this.range ? this.source.base : this.source;
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scope = o.scope;
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name = this.name && this.name.compile(o, LEVEL_LIST);
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@ -1809,7 +1816,7 @@
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immediate: true
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});
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}
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if (this.returns && !lastJumps) {
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if (this.returns) {
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rvar = scope.freeVariable('results');
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}
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ivar = (this.range ? name : index) || scope.freeVariable('i');
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@ -1843,7 +1850,7 @@
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forPart = "" + ivar + " = 0, " + lvar + " = " + svar + ".length; " + ivar + " < " + lvar + "; " + stepPart;
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}
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}
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if (this.returns && !lastJumps) {
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if (this.returns) {
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resultPart = "" + this.tab + rvar + " = [];\n";
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returnResult = "\n" + this.tab + "return " + rvar + ";";
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body = Push.wrap(rvar, body);
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@ -1931,7 +1938,7 @@
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for (_i = 0, _len = _ref.length; _i < _len; _i++) {
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_ref2 = _ref[_i], conds = _ref2[0], block = _ref2[1];
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if (block.jumps(o)) {
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return true;
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return block;
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}
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}
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return (_ref3 = this.otherwise) != null ? _ref3.jumps(o) : void 0;
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@ -186,7 +186,7 @@ exports.Expressions = class Expressions extends Base
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jumps: (o) ->
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for exp in @expressions
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return true if exp.jumps o
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return exp if exp.jumps o
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# An Expressions node does not return its entire body, rather it
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# ensures that the final expression is returned.
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@ -283,7 +283,7 @@ exports.Literal = class Literal extends Base
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jumps: (o) ->
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return no unless @value in ['break', 'continue', 'debugger']
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not (o and (o.loop or o.block and (@value isnt 'continue')))
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if not (o and (o.loop or o.block and (@value isnt 'continue'))) then this else no
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compile: ->
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if @value.reserved then "\"#{@value}\"" else @value
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@ -302,7 +302,7 @@ exports.Return = class Return extends Base
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isStatement: YES
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makeReturn: THIS
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jumps: YES
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jumps: THIS
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compile: (o, level) ->
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expr = @expression?.makeReturn()
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@ -1139,7 +1139,7 @@ exports.While = class While extends Base
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{expressions} = @body
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return no unless expressions.length
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for node in expressions
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return yes if node.jumps loop: yes
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return node if node.jumps loop: yes
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no
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# The main difference from a JavaScript *while* is that the CoffeeScript
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@ -1444,13 +1444,14 @@ exports.For = class For extends Base
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compileNode: (o) ->
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body = Expressions.wrap [@body]
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lastJumps = last(body.expressions)?.jumps()
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@returns = no if lastJumps and lastJumps instanceof Return
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source = if @range then @source.base else @source
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scope = o.scope
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name = @name and @name.compile o, LEVEL_LIST
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index = @index and @index.compile o, LEVEL_LIST
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scope.find(name, immediate: yes) if name and not @pattern
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scope.find(index, immediate: yes) if index
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rvar = scope.freeVariable 'results' if @returns and not lastJumps
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rvar = scope.freeVariable 'results' if @returns
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ivar = (if @range then name else index) or scope.freeVariable 'i'
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name = ivar if @pattern
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varPart = ''
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@ -1472,7 +1473,7 @@ exports.For = class For extends Base
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lvar = scope.freeVariable 'len'
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stepPart = if @step then "#{ivar} += #{ @step.compile(o, LEVEL_OP) }" else "#{ivar}++"
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forPart = "#{ivar} = 0, #{lvar} = #{svar}.length; #{ivar} < #{lvar}; #{stepPart}"
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if @returns and not lastJumps
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if @returns
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resultPart = "#{@tab}#{rvar} = [];\n"
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returnResult = "\n#{@tab}return #{rvar};"
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body = Push.wrap rvar, body
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@ -1530,7 +1531,7 @@ exports.Switch = class Switch extends Base
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jumps: (o = {block: yes}) ->
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for [conds, block] in @cases
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return yes if block.jumps o
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return block if block.jumps o
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@otherwise?.jumps o
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makeReturn: ->
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@ -279,3 +279,10 @@ result = try
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i
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eq result, 10
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# Comprehensions over break.
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arrayEq (break for [1..10]), []
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# Comprehensions over continue.
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arrayEq (break for [1..10]), []
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@ -51,3 +51,21 @@ ok list.join(' ') is '8 6 4 2'
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#759: `if` within `while` condition
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2 while if 1 then 0
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# While over break.
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i = 0
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result = while i < 10
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i++
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break
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arrayEq result, []
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# While over continue.
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i = 0
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result = while i < 10
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i++
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continue
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arrayEq result, []
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