RequireEnsureDependenciesBlockParserPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const RequireEnsureDependenciesBlock = require("./RequireEnsureDependenciesBlock");
const RequireEnsureDependency = require("./RequireEnsureDependency");
const RequireEnsureItemDependency = require("./RequireEnsureItemDependency");
const getFunctionExpression = require("./getFunctionExpression");
module.exports = class RequireEnsureDependenciesBlockParserPlugin {
apply(parser) {
parser.hooks.call
.for("require.ensure")
.tap("RequireEnsureDependenciesBlockParserPlugin", expr => {
let chunkName = null;
let errorExpressionArg = null;
let errorExpression = null;
switch (expr.arguments.length) {
case 4: {
const chunkNameExpr = parser.evaluateExpression(expr.arguments[3]);
if (!chunkNameExpr.isString()) return;
chunkName = chunkNameExpr.string;
}
// falls through
case 3: {
errorExpressionArg = expr.arguments[2];
errorExpression = getFunctionExpression(errorExpressionArg);
if (!errorExpression && !chunkName) {
const chunkNameExpr = parser.evaluateExpression(
expr.arguments[2]
);
if (!chunkNameExpr.isString()) return;
chunkName = chunkNameExpr.string;
}
}
// falls through
case 2: {
const dependenciesExpr = parser.evaluateExpression(
expr.arguments[0]
);
const dependenciesItems = dependenciesExpr.isArray()
? dependenciesExpr.items
: [dependenciesExpr];
const successExpressionArg = expr.arguments[1];
const successExpression =
getFunctionExpression(successExpressionArg);
if (successExpression) {
parser.walkExpressions(successExpression.expressions);
}
if (errorExpression) {
parser.walkExpressions(errorExpression.expressions);
}
const depBlock = new RequireEnsureDependenciesBlock(
chunkName,
expr.loc
);
const errorCallbackExists =
expr.arguments.length === 4 ||
(!chunkName && expr.arguments.length === 3);
const dep = new RequireEnsureDependency(
expr.range,
expr.arguments[1].range,
errorCallbackExists && expr.arguments[2].range
);
dep.loc = expr.loc;
depBlock.addDependency(dep);
const old = parser.state.current;
parser.state.current = depBlock;
try {
let failed = false;
parser.inScope([], () => {
for (const ee of dependenciesItems) {
if (ee.isString()) {
const ensureDependency = new RequireEnsureItemDependency(
ee.string
);
ensureDependency.loc = ee.loc || expr.loc;
depBlock.addDependency(ensureDependency);
} else {
failed = true;
}
}
});
if (failed) {
return;
}
if (successExpression) {
if (successExpression.fn.body.type === "BlockStatement") {
parser.walkStatement(successExpression.fn.body);
} else {
parser.walkExpression(successExpression.fn.body);
}
}
old.addBlock(depBlock);
} finally {
parser.state.current = old;
}
if (!successExpression) {
parser.walkExpression(successExpressionArg);
}
if (errorExpression) {
if (errorExpression.fn.body.type === "BlockStatement") {
parser.walkStatement(errorExpression.fn.body);
} else {
parser.walkExpression(errorExpression.fn.body);
}
} else if (errorExpressionArg) {
parser.walkExpression(errorExpressionArg);
}
return true;
}
}
});
}
};