@babel/helper-builder-react-jsx/lib/index.js

Helper function to build react jsx

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = _default;
var t_1 = require("@babel/types");
var _helperAnnotateAsPure = require("@babel/helper-annotate-as-pure");
const {
  booleanLiteral,
  callExpression,
  identifier,
  inherits,
  isIdentifier,
  isJSXExpressionContainer,
  isJSXIdentifier,
  isJSXMemberExpression,
  isJSXNamespacedName,
  isJSXSpreadAttribute,
  isObjectExpression,
  isReferenced,
  isStringLiteral,
  isValidIdentifier,
  memberExpression,
  nullLiteral,
  objectExpression,
  objectProperty,
  react,
  spreadElement,
  stringLiteral,
  thisExpression
} = t_1;
function _default(opts) {
  const visitor = {};
  visitor.JSXNamespacedName = function (path) {
    if (opts.throwIfNamespace) {
      throw path.buildCodeFrameError(`Namespace tags are not supported by default. React's JSX doesn't support namespace tags. \
You can set \`throwIfNamespace: false\` to bypass this warning.`);
    }
  };
  visitor.JSXSpreadChild = function (path) {
    throw path.buildCodeFrameError("Spread children are not supported in React.");
  };
  visitor.JSXElement = {
    exit(path, state) {
      const callExpr = buildElementCall(path, state);
      if (callExpr) {
        path.replaceWith(inherits(callExpr, path.node));
      }
    }
  };
  visitor.JSXFragment = {
    exit(path, state) {
      if (opts.compat) {
        throw path.buildCodeFrameError("Fragment tags are only supported in React 16 and up.");
      }
      const callExpr = buildFragmentCall(path, state);
      if (callExpr) {
        path.replaceWith(inherits(callExpr, path.node));
      }
    }
  };
  return visitor;
  function convertJSXIdentifier(node, parent) {
    if (isJSXIdentifier(node)) {
      if (node.name === "this" && isReferenced(node, parent)) {
        return thisExpression();
      } else if (isValidIdentifier(node.name, false)) {
        node.type = "Identifier";
        return node;
      } else {
        return stringLiteral(node.name);
      }
    } else if (isJSXMemberExpression(node)) {
      return memberExpression(convertJSXIdentifier(node.object, node), convertJSXIdentifier(node.property, node));
    } else if (isJSXNamespacedName(node)) {
      return stringLiteral(`${node.namespace.name}:${node.name.name}`);
    }
    return node;
  }
  function convertAttributeValue(node) {
    if (isJSXExpressionContainer(node)) {
      return node.expression;
    } else {
      return node;
    }
  }
  function convertAttribute(node) {
    if (isJSXSpreadAttribute(node)) {
      return spreadElement(node.argument);
    }
    const value = convertAttributeValue(node.value || booleanLiteral(true));
    if (isStringLiteral(value) && !isJSXExpressionContainer(node.value)) {
      var _value$extra;
      value.value = value.value.replace(/\n\s+/g, " ");
      (_value$extra = value.extra) == null || delete _value$extra.raw;
    }
    if (isJSXNamespacedName(node.name)) {
      node.name = stringLiteral(node.name.namespace.name + ":" + node.name.name.name);
    } else if (isValidIdentifier(node.name.name, false)) {
      node.name.type = "Identifier";
    } else {
      node.name = stringLiteral(node.name.name);
    }
    return inherits(objectProperty(node.name, value), node);
  }
  function buildElementCall(path, pass) {
    if (opts.filter && !opts.filter(path.node, pass)) return;
    const openingPath = path.get("openingElement");
    path.node.children = react.buildChildren(path.node);
    const tagExpr = convertJSXIdentifier(openingPath.node.name, openingPath.node);
    const args = [];
    let tagName;
    if (isIdentifier(tagExpr)) {
      tagName = tagExpr.name;
    } else if (isStringLiteral(tagExpr)) {
      tagName = tagExpr.value;
    }
    const state = {
      tagExpr: tagExpr,
      tagName: tagName,
      args: args,
      pure: false
    };
    if (opts.pre) {
      opts.pre(state, pass);
    }
    const attribs = openingPath.node.attributes;
    let convertedAttributes;
    if (attribs.length) {
      convertedAttributes = buildOpeningElementAttributes(attribs, pass);
    } else {
      convertedAttributes = nullLiteral();
    }
    args.push(convertedAttributes, ...path.node.children);
    if (opts.post) {
      opts.post(state, pass);
    }
    const call = state.call || callExpression(state.callee, args);
    if (state.pure) (0, _helperAnnotateAsPure.default)(call);
    return call;
  }
  function pushProps(_props, objs) {
    if (!_props.length) return _props;
    objs.push(objectExpression(_props));
    return [];
  }
  function buildOpeningElementAttributes(attribs, pass) {
    let _props = [];
    const objs = [];
    const {
      useSpread = false
    } = pass.opts;
    if (typeof useSpread !== "boolean") {
      throw new Error("transform-react-jsx currently only accepts a boolean option for " + "useSpread (defaults to false)");
    }
    const useBuiltIns = pass.opts.useBuiltIns || false;
    if (typeof useBuiltIns !== "boolean") {
      throw new Error("transform-react-jsx currently only accepts a boolean option for " + "useBuiltIns (defaults to false)");
    }
    if (useSpread && useBuiltIns) {
      throw new Error("transform-react-jsx currently only accepts useBuiltIns or useSpread " + "but not both");
    }
    if (useSpread) {
      const props = attribs.map(convertAttribute);
      return objectExpression(props);
    }
    while (attribs.length) {
      const prop = attribs.shift();
      if (isJSXSpreadAttribute(prop)) {
        _props = pushProps(_props, objs);
        objs.push(prop.argument);
      } else {
        _props.push(convertAttribute(prop));
      }
    }
    pushProps(_props, objs);
    let convertedAttribs;
    if (objs.length === 1) {
      convertedAttribs = objs[0];
    } else {
      if (!isObjectExpression(objs[0])) {
        objs.unshift(objectExpression([]));
      }
      const helper = useBuiltIns ? memberExpression(identifier("Object"), identifier("assign")) : pass.addHelper("extends");
      convertedAttribs = callExpression(helper, objs);
    }
    return convertedAttribs;
  }
  function buildFragmentCall(path, pass) {
    if (opts.filter && !opts.filter(path.node, pass)) return;
    path.node.children = react.buildChildren(path.node);
    const args = [];
    const tagName = null;
    const tagExpr = pass.get("jsxFragIdentifier")();
    const state = {
      tagExpr: tagExpr,
      tagName: tagName,
      args: args,
      pure: false
    };
    if (opts.pre) {
      opts.pre(state, pass);
    }
    args.push(nullLiteral(), ...path.node.children);
    if (opts.post) {
      opts.post(state, pass);
    }
    pass.set("usedFragment", true);
    const call = state.call || callExpression(state.callee, args);
    if (state.pure) (0, _helperAnnotateAsPure.default)(call);
    return call;
  }
}

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