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| "use strict";
var console = require('console');
var jsep = require('jsep');
jsep.addBinaryOp("or", 1);
jsep.addBinaryOp("and", 2);
jsep.addBinaryOp("eq", 6);
jsep.addBinaryOp("neq", 6);
jsep.addBinaryOp("lt", 7);
jsep.addBinaryOp("lte", 7);
jsep.addBinaryOp("gt", 7);
jsep.addBinaryOp("gte", 7);
var addSlashes = function(str) {
return str.replace(/[\\"']/g, '\\$&').replace(/\u0000/g, '\\0');
};
var removeStyle = function(style, startPos, endPos, skipRows, startOffset, endOffset, insert) {
var styleRows = style.split("\n");
var start = startOffset;
var end = endOffset;
for (var r = 1 + skipRows; r < startPos.line; r++) start += styleRows[r - 1 - skipRows].length + 1;
start += startPos.col;
if (endPos !== null) {
for (var r2 = 1 + skipRows; r2 < endPos.line; r2++) end += styleRows[r2 - 1 - skipRows].length + 1;
end += endPos.col;
} else end += style.length + 1;
var newStyle = style.substr(0, start - 1) + insert + style.substr(end - 1);
return newStyle;
};
var expressionGenerator = function(node, bindingProvider, defVal) {
function mapOperator(op) {
switch (op) {
case 'or':
return '||';
case 'and':
return '&&';
case 'lt':
return '<';
case 'lte':
return '<=';
case 'gt':
return '>';
case 'gte':
return '>=';
case 'eq':
return '==';
case 'neq':
return '!=';
default:
return op;
}
}
function gen(node, bindingProvider, lookupmember, defVal) {
if (typeof lookupmember == 'undefined') lookupmember = true;
if (typeof defVal !== 'undefined' && node.type !== "Identifier" && node.type !== "MemberExpression") console.log("Cannot apply default value to variable when using expressions");
if (node.type === "BinaryExpression" || node.type === "LogicalExpression") {
return '(' + gen(node.left, bindingProvider, lookupmember) + ' ' + mapOperator(node.operator) + ' ' + gen(node.right, bindingProvider, lookupmember) + ')';
} else if (node.type === 'CallExpression') {
var args = node.arguments.map(function(n) {
return gen(n, bindingProvider, lookupmember);
});
return gen(node.callee, bindingProvider, lookupmember) + '(' + args.join(', ') + ')';
} else if (node.type === "UnaryExpression") {
return node.operator + gen(node.argument, bindingProvider, lookupmember);
} else Iif (node.type == 'MemberExpression' && node.computed) {
throw "Unexpected computed member expression";
// return gen(node.object) + '[' + gen(node.property) + ']';
} else if (node.type == 'MemberExpression' && !node.computed) {
var me = gen(node.object, bindingProvider, false) + '.' + gen(node.property, bindingProvider, false);
if (lookupmember && node.object.name !== 'Math' && node.object.name !== 'Color') return bindingProvider(me, defVal) + '()';
return me;
} else if (node.type === "Literal") {
return node.raw;
} else if (node.type === 'Identifier') {
var id = node.name;
if (lookupmember) return bindingProvider(id, defVal) + '()';
else return id;
} else if (node.type === 'ConditionalExpression') {
return '(' + gen(node.test, bindingProvider, lookupmember) + ' ? ' + gen(node.consequent, bindingProvider, lookupmember) + ' : ' + gen(node.alternate, bindingProvider, lookupmember) + ')';
} else Eif (node.type === 'Compound') {
throw "Syntax error in expression: operator expected after " + gen(node.body[0], bindingProvider, false);
} else {
throw "Found an unsupported expression type: " + node.type;
}
}
return gen(node, bindingProvider, undefined, defVal);
};
var expressionBinding = function(expression, bindingProvider, defaultValue) {
var matches;
if (typeof defaultValue !== 'undefined' && defaultValue !== null) {
var check = expression.trim().replace(/@\[([^\]]+)\]|@([a-zA-Z0-9\._]+)\b/g, '###var###');
check = check.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
if (check == '###var###') matches = [null, defaultValue];
else {
check = '^' + check.replace(/###var###/g, '(.+)') + '$';
matches = defaultValue.trim().match(new RegExp(check));
if (!matches) {
// TODO throw error?
console.log("Cannot find matches", matches, "for", defaultValue, expression, check, expression);
throw "Cannot find default value for " + expression + " in " + defaultValue;
}
}
}
try {
var vars = 0;
var result = "'" + expression.replace(/@\[([^\]]+)\]|@([a-zA-Z0-9\._]+)\b|(')/g, function(match, p1, p2, p3) {
// escaping..
if (p3) return "\\" + p3;
vars++;
var varName = p1 || p2;
var defVal;
if (matches) {
Eif (typeof matches[vars] !== 'undefined') {
defVal = matches[vars].trim();
} else {
console.log("ABZZZ Cannot find default value for", varName, "in", matches, "as", vars);
}
}
// in case we found p1 we are in a @[sequence] so we start an expression parser
if (p1) {
var parsetree = jsep(p1);
var gentree = expressionGenerator(parsetree, bindingProvider, defVal);
return "'+" + gentree + "+'";
}
return "'+" + bindingProvider(varName, defVal) + "()+'";
}) + "'";
result = result.replace(/(^|[^\\])''\+/g, '$1').replace(/\+''/g, '');
Iif (vars === 0 && result !== 'false' && result !== 'true') {
console.error("Unexpected expression with no valid @variable references", expression);
}
return result;
} catch (e) {
throw "Exception parsing expression " + expression + " " + e;
}
};
var conditionBinding = function(condition, bindingProvider) {
var parsetree = jsep(condition);
var gentree = expressionGenerator(parsetree, bindingProvider);
return gentree;
};
module.exports = {
addSlashes: addSlashes,
removeStyle: removeStyle,
conditionBinding: conditionBinding,
expressionBinding: expressionBinding
}; |