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Prefix and suffix edge cases for flow statements.

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Call suffix code on break/continue before executing the break/continue.
Call prefix code for enclosing loop before executing continue.
This commit is contained in:
Neil Fraser
2019-05-13 15:25:52 -07:00
committed by Neil Fraser
parent 0259f8bb48
commit 25adb40e66
16 changed files with 131 additions and 42 deletions
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23
generators/lua/loops.js
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@@ -49,6 +49,7 @@ Blockly.Lua.CONTINUE_STATEMENT = 'goto continue\n';
*/
Blockly.Lua.addContinueLabel_ = function(branch) {
if (branch.indexOf(Blockly.Lua.CONTINUE_STATEMENT) != -1) {
// False positives are possible (e.g. a string literal), but are harmless.
return branch + Blockly.Lua.INDENT + '::continue::\n';
} else {
return branch;
@@ -156,11 +157,27 @@ Blockly.Lua['controls_forEach'] = function(block) {
Blockly.Lua['controls_flow_statements'] = function(block) {
// Flow statements: continue, break.
switch (block.getFieldValue('FLOW')) {
var flowType = block.getFieldValue('FLOW');
var xfix = '';
if (Blockly.Lua.STATEMENT_SUFFIX) {
// Inject any statement suffix here since the regular one at the end
// will not get executed if the break/continue is triggered.
xfix += Blockly.Lua.injectId(Blockly.Lua.STATEMENT_SUFFIX, block);
}
if (Blockly.Lua.STATEMENT_PREFIX && flowType == 'CONTINUE') {
var loop = Blockly.Constants.Loops
.CONTROL_FLOW_IN_LOOP_CHECK_MIXIN.getSurroundLoop(block);
if (loop) {
// Inject loop's statement prefix here since the regular one at the end
// of the loop will not get executed if the continue is triggered.
xfix += Blockly.Lua.injectId(Blockly.Lua.STATEMENT_PREFIX, loop);
}
}
switch (flowType) {
case 'BREAK':
return 'break\n';
return xfix + 'break\n';
case 'CONTINUE':
return Blockly.Lua.CONTINUE_STATEMENT;
return xfix + Blockly.Lua.CONTINUE_STATEMENT;
}
throw Error('Unknown flow statement.');
};