forked from prettier/prettier
/
printer-estree-json.js
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/
printer-estree-json.js
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"use strict";
const { concat, hardline, indent, join } = require("../doc").builders;
const preprocess = require("./preprocess");
function genericPrint(path, options, print) {
const node = path.getValue();
switch (node.type) {
case "JsonRoot":
return concat([path.call(print, "node"), hardline]);
case "ArrayExpression":
return node.elements.length === 0
? "[]"
: concat([
"[",
indent(
concat([
hardline,
join(concat([",", hardline]), path.map(print, "elements"))
])
),
hardline,
"]"
]);
case "ObjectExpression":
return node.properties.length === 0
? "{}"
: concat([
"{",
indent(
concat([
hardline,
join(concat([",", hardline]), path.map(print, "properties"))
])
),
hardline,
"}"
]);
case "ObjectProperty":
return concat([path.call(print, "key"), ": ", path.call(print, "value")]);
case "UnaryExpression":
return concat([
node.operator === "+" ? "" : node.operator,
path.call(print, "argument")
]);
case "NullLiteral":
return "null";
case "BooleanLiteral":
return node.value ? "true" : "false";
case "StringLiteral":
case "NumericLiteral":
return JSON.stringify(node.value);
case "Identifier":
return JSON.stringify(node.name);
default:
/* istanbul ignore next */
throw new Error("unknown type: " + JSON.stringify(node.type));
}
}
function clean(node, newNode /*, parent*/) {
delete newNode.start;
delete newNode.end;
delete newNode.extra;
delete newNode.loc;
delete newNode.comments;
delete newNode.errors;
if (node.type === "Identifier") {
return { type: "StringLiteral", value: node.name };
}
if (node.type === "UnaryExpression" && node.operator === "+") {
return newNode.argument;
}
}
module.exports = {
preprocess,
print: genericPrint,
massageAstNode: clean
};