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1 | 'use strict';
var objectPatternC = require('nodes');
var nodes = objectPatternC.nodes;
var syntax = require('nodes/syntax.json');
var objectPatternB = require('../util/string');
var express = objectPatternB.express, lower = objectPatternB.lower, upper = objectPatternB.upper;
var objectPatternA = require('../util/insertion');
var insertBefore = objectPatternA.insertBefore;
var objectPattern = require('../util/id');
var getUniqueId = objectPattern.getUniqueId;
var createDeclarator = function (id, init) {
return new nodes.VariableDeclarator({
id: id,
init: init
});
};
var createAssignment = function (left, right) {
return new nodes.AssignmentExpression({
operator: '=',
left: left,
right: right
});
};
var destruct = {
ArrayPattern: function (pattern, declarations, valueId, assign) {
var create = assign ? createAssignment : createDeclarator;
pattern.elements.forEachRight(function (element, i) {
if (element == null) {
return;
}
var memberString = valueId ? valueId.name + '[' + i + ']' : null;
if (element.type === syntax.Identifier) {
declarations.unshift(create(element, memberString ? express(memberString).expression : null));
} else {
if (element.search('properties > * > value#Identifier, elements > #Identifier').length) {
var nestedId;
if (valueId) {
nestedId = getUniqueId(declarations.scope(), valueId.name + i);
var declaration = express('var ' + nestedId.name + ' = ' + memberString);
insertBefore(declarations, declaration);
}
destruct[element.type](element, declarations, nestedId, assign);
}
}
});
},
ObjectPattern: function (pattern, declarations, valueId, assign) {
var create = assign ? createAssignment : createDeclarator;
pattern.properties.forEachRight(function (property) {
var memberString = valueId ? valueId.name + '.' + property.key.name : null;
var value = property.value;
if (value.type === syntax.Identifier) {
declarations.unshift(create(value, memberString ? express(memberString).expression : null));
} else {
if (value.search('properties > * > value#Identifier, elements > #Identifier').length) {
var nestedId;
Eif (valueId) {
nestedId = getUniqueId(declarations.scope(), valueId.name + upper(property.key.name));
var declaration = express('var ' + nestedId.name + ' = ' + memberString);
insertBefore(declarations, declaration);
}
destruct[value.type](value, declarations, nestedId, assign);
}
}
});
}
};
function patternify(program) {
var q;
q = [
'#ForOfStatement > left > declarations > * > #ArrayPattern',
'#ForOfStatement > left > declarations > * > #ObjectPattern',
'#ForInStatement > left > declarations > * > #ArrayPattern',
'#ForInStatement > left > declarations > * > #ObjectPattern'
];
program.search(q).forEachRight(function (pattern) {
var declarator = pattern.parentNode;
var declarations = declarator.parentNode;
var declaration = declarations.parentNode;
var forStatement = declaration.parentNode;
var valueId = getUniqueId(forStatement.scope(), lower(pattern.type));
declarations.replaceChild(declarator, new nodes.VariableDeclarator({
id: valueId,
kind: declaration.kind
}));
var newDeclaration = new nodes.VariableDeclaration();
forStatement.body.body.unshift(newDeclaration);
destruct[pattern.type](pattern, newDeclaration.declarations, valueId);
});
q = [
'#ForOfStatement > left#ArrayPattern',
'#ForOfStatement > left#ObjectPattern',
'#ForInStatement > left#ArrayPattern',
'#ForInStatement > left#ObjectPattern'
];
program.search(q).forEachRight(function (pattern) {
var forStatement = pattern.parentNode;
var valueId = getUniqueId(forStatement.scope(), lower(pattern.type));
forStatement.left = express('var ' + valueId.name);
var expression = new nodes.ExpressionStatement();
var sequence = new nodes.SequenceExpression();
expression.expression = sequence;
forStatement.body.body.unshift(expression);
destruct[pattern.type](pattern, sequence.expressions, valueId, true);
});
q = '#VariableDeclarator > #ArrayPattern, #VariableDeclarator > #ObjectPattern';
program.search(q).forEachRight(function (pattern) {
var declarator = pattern.parentNode;
var declarations = declarator.parentNode;
var declaration = declarations.parentNode;
declarations.removeChild(declarator);
if (!pattern.search('properties > * > value#Identifier, elements > #Identifier').length) {
if (!declarations.length) {
declaration.parentNode.removeChild(declaration);
}
return;
}
if (declarator.init == null) {
destruct[pattern.type](pattern, declarations);
} else {
var valueId;
if (declarator.init.type === syntax.Identifier) {
valueId = declarator.init;
} else {
valueId = getUniqueId(declarations.scope(), lower(pattern.type));
var valueDeclaration = express('var ' + valueId.name + ' = $');
valueDeclaration.declarations[0].init = declarator.init;
insertBefore(declarations, valueDeclaration);
}
destruct[pattern.type](pattern, declarations, valueId);
}
});
q = '#AssignmentExpression > left#ArrayPattern, #AssignmentExpression > left#ObjectPattern';
program.search(q).forEachRight(function (pattern) {
var expression = pattern.parentNode;
var right = expression.right;
var expressions = expression.parentNode;
var sequence = expressions.parentNode;
if (sequence.type !== syntax.SequenceExpression) {
var key = expressions.indexOf(expression);
expressions[key] = new nodes.SequenceExpression({ expressions: [expressions[key]] });
expressions = expressions[key].expressions;
}
expressions.removeChild(expression);
sequence = expressions.parentNode;
var valueId;
if (right.type === syntax.Identifier) {
valueId = right;
} else {
valueId = getUniqueId(sequence.scope(), lower(pattern.type));
var declaration = express('var ' + valueId.name + ' = $');
declaration.declarations[0].init = right;
insertBefore(sequence, declaration);
}
destruct[pattern.type](pattern, expressions, valueId, true);
});
q = '#Function > params > #ArrayPattern, #Function > params > #ObjectPattern';
program.search(q).forEachRight(function (pattern) {
var params = pattern.parentNode;
var fn = params.parentNode;
var valueId = getUniqueId(fn, lower(pattern.type));
params.replaceChild(pattern, valueId);
if (!pattern.search('properties > * > value#Identifier, elements > #Identifier').length) {
return;
}
var declaration = new nodes.VariableDeclaration();
fn.body.body.unshift(declaration);
destruct[pattern.type](pattern, declaration.declarations, valueId);
});
}
exports.transform = patternify; |