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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = populatePlaceholders;
var _t = require("@babel/types");
const {
blockStatement,
cloneNode,
emptyStatement,
expressionStatement,
identifier,
isStatement,
isStringLiteral,
stringLiteral,
validate
} = _t;
function populatePlaceholders(metadata, replacements) {
const ast = cloneNode(metadata.ast);
if (replacements) {
metadata.placeholders.forEach(placeholder => {
if (!Object.prototype.hasOwnProperty.call(replacements, placeholder.name)) {
const placeholderName = placeholder.name;
throw new Error(`Error: No substitution given for "${placeholderName}". If this is not meant to be a
placeholder you may want to consider passing one of the following options to @babel/template:
- { placeholderPattern: false, placeholderWhitelist: new Set(['${placeholderName}'])}
- { placeholderPattern: /^${placeholderName}$/ }`);
}
});
Object.keys(replacements).forEach(key => {
if (!metadata.placeholderNames.has(key)) {
throw new Error(`Unknown substitution "${key}" given`);
}
});
}
metadata.placeholders.slice().reverse().forEach(placeholder => {
try {
applyReplacement(placeholder, ast, replacements && replacements[placeholder.name] || null);
} catch (e) {
e.message = `@babel/template placeholder "${placeholder.name}": ${e.message}`;
throw e;
}
});
return ast;
}
function applyReplacement(placeholder, ast, replacement) {
if (placeholder.isDuplicate) {
if (Array.isArray(replacement)) {
replacement = replacement.map(node => cloneNode(node));
} else if (typeof replacement === "object") {
replacement = cloneNode(replacement);
}
}
const {
parent,
key,
index
} = placeholder.resolve(ast);
if (placeholder.type === "string") {
if (typeof replacement === "string") {
replacement = stringLiteral(replacement);
}
if (!replacement || !isStringLiteral(replacement)) {
throw new Error("Expected string substitution");
}
} else if (placeholder.type === "statement") {
if (index === undefined) {
if (!replacement) {
replacement = emptyStatement();
} else if (Array.isArray(replacement)) {
replacement = blockStatement(replacement);
} else if (typeof replacement === "string") {
replacement = expressionStatement(identifier(replacement));
} else if (!isStatement(replacement)) {
replacement = expressionStatement(replacement);
}
} else {
if (replacement && !Array.isArray(replacement)) {
if (typeof replacement === "string") {
replacement = identifier(replacement);
}
if (!isStatement(replacement)) {
replacement = expressionStatement(replacement);
}
}
}
} else if (placeholder.type === "param") {
if (typeof replacement === "string") {
replacement = identifier(replacement);
}
if (index === undefined) throw new Error("Assertion failure.");
} else {
if (typeof replacement === "string") {
replacement = identifier(replacement);
}
if (Array.isArray(replacement)) {
throw new Error("Cannot replace single expression with an array.");
}
}
if (index === undefined) {
validate(parent, key, replacement);
parent[key] = replacement;
} else {
const items = parent[key].slice();
if (placeholder.type === "statement" || placeholder.type === "param") {
if (replacement == null) {
items.splice(index, 1);
} else if (Array.isArray(replacement)) {
items.splice(index, 1, ...replacement);
} else {
items[index] = replacement;
}
} else {
items[index] = replacement;
}
validate(parent, key, items);
parent[key] = items;
}
}