babel-plugin-ember-template-compilation
Version:
Babel implementation of Ember's low-level template-compilation API
184 lines • 30.4 kB
JavaScript
import { ScopeLocals } from './scope-locals.js';
export class ExpressionParser {
constructor(babel) {
this.babel = babel;
}
parseExpression(invokedName, path) {
switch (path.node.type) {
case 'ObjectExpression':
return this.parseObjectExpression(invokedName, path);
case 'ArrayExpression': {
return this.parseArrayExpression(invokedName, path);
}
case 'StringLiteral':
case 'BooleanLiteral':
case 'NumericLiteral':
return path.node.value;
default:
throw path.buildCodeFrameError(`${invokedName} can only accept static options but you passed ${JSON.stringify(path.node)}`);
}
}
parseArrayExpression(invokedName, path) {
return path.get('elements').map((element) => {
if (element.isSpreadElement()) {
throw element.buildCodeFrameError(`spread element is not allowed here`);
}
else if (element.isExpression()) {
return this.parseExpression(invokedName, element);
}
return null;
});
}
parseScope(invokedName, path) {
let body = undefined;
if (path.node.type === 'ObjectMethod') {
body = path.node.body;
}
else {
let { value } = path.node;
if (this.t.isObjectExpression(value)) {
throw path.buildCodeFrameError(`Passing an object as the \`scope\` property to inline templates is no longer supported. Please pass a function that returns an object expression instead.`);
}
if (this.t.isFunctionExpression(value) || this.t.isArrowFunctionExpression(value)) {
body = value.body;
}
}
let objExpression = undefined;
if (body?.type === 'ObjectExpression') {
objExpression = body;
}
else if (body?.type === 'BlockStatement') {
// SAFETY: We know that the body is a ReturnStatement because we're checking inside
let returnStatements = body.body.filter((statement) => statement.type === 'ReturnStatement');
if (returnStatements.length !== 1) {
throw new Error('Scope functions must have a single return statement which returns an object expression containing references to in-scope values');
}
objExpression = returnStatements[0].argument;
}
if (objExpression?.type !== 'ObjectExpression') {
throw path.buildCodeFrameError(`Scope objects for \`${invokedName}\` must be an object expression containing only references to in-scope values, or a function that returns an object expression containing only references to in-scope values`);
}
return objExpression.properties.reduce((res, prop) => {
if (this.t.isSpreadElement(prop)) {
throw path.buildCodeFrameError(`Scope objects for \`${invokedName}\` may not contain spread elements`);
}
if (this.t.isObjectMethod(prop)) {
throw path.buildCodeFrameError(`Scope objects for \`${invokedName}\` may not contain methods`);
}
let { key, value } = prop;
if (!this.t.isStringLiteral(key) && !this.t.isIdentifier(key)) {
throw path.buildCodeFrameError(`Scope objects for \`${invokedName}\` may only contain static property names`);
}
let propName = name(key);
switch (value.type) {
case 'Identifier':
res.add(propName, value.name);
break;
case 'ThisExpression':
res.add(propName, 'this');
break;
default:
throw path.buildCodeFrameError(`Scope objects for \`${invokedName}\` may only contain direct references to in-scope values, e.g. { ${propName} } or { ${propName}: ${propName} }. Found ${value.type}`);
}
return res;
}, new ScopeLocals({ mode: 'explicit' }));
}
parseEval(invokedName, path) {
let body;
if (path.isObjectMethod()) {
body = path.get('body');
}
else if (path.isObjectProperty()) {
let value = path.get('value');
if (value.isFunctionExpression()) {
body = value.get('body');
}
else {
throw path.buildCodeFrameError(`unsupported syntax for \`eval\` parameter to \`${invokedName}\`. It must be an object method or a function.`);
}
}
else {
throw path.buildCodeFrameError(`unsupported syntax for \`eval\` parameter to \`${invokedName}\`. It must be an object method or a function.`);
}
let returnStatements = body
.get('body')
.filter((statement) => statement.isReturnStatement());
if (returnStatements.length !== 1) {
throw body.buildCodeFrameError('eval function must have a single return statement');
}
let returnExpression = returnStatements[0].get('argument');
if (!returnExpression.isCallExpression()) {
throw returnStatements[0].buildCodeFrameError('eval function must return `eval(arguments[0])`. Found non-CallExpression.');
}
let callee = returnExpression.get('callee');
if (!callee.isIdentifier() || callee.node.name !== 'eval') {
throw returnExpression.buildCodeFrameError('eval function must return `eval(arguments[0])`. Found callee is not eval.');
}
let args = returnExpression.get('arguments');
if (args.length !== 1) {
throw returnExpression.buildCodeFrameError('eval function must return `eval(arguments[0])`. Found incorrect number of arguments.');
}
let arg = args[0];
if (!arg.isMemberExpression()) {
throw arg.buildCodeFrameError('eval function must return `eval(arguments[0])`. Found argument is non-MemberExpression.');
}
let obj = arg.get('object');
if (!obj.isIdentifier() || obj.node.name !== 'arguments') {
throw obj.buildCodeFrameError('eval function must return `eval(arguments[0])`. Found wrong argument to eval.');
}
let prop = arg.get('property');
if (!prop.isNumericLiteral() || prop.node.value !== 0) {
throw prop.buildCodeFrameError('eval function must return `eval(arguments[0])`. Found wrong property.');
}
return { isEval: true };
}
parseObjectExpression(invokedName, path, shouldParseScope = false, shouldSupportRFC931 = false) {
let result = {};
path.get('properties').forEach((property) => {
let { node } = property;
if (this.t.isSpreadElement(node)) {
throw property.buildCodeFrameError(`${invokedName} does not allow spread element`);
}
if (node.computed) {
throw property.buildCodeFrameError(`${invokedName} can only accept static property names`);
}
let { key } = node;
if (!this.t.isIdentifier(key) && !this.t.isStringLiteral(key)) {
throw property.buildCodeFrameError(`${invokedName} can only accept static property names`);
}
let propertyName = name(key);
if (shouldParseScope && propertyName === 'scope') {
result.scope = this.parseScope(invokedName, property);
}
else if (shouldSupportRFC931 && propertyName === 'eval') {
result.eval = this.parseEval(invokedName, property);
}
else if (shouldSupportRFC931 && propertyName === 'component') {
result.component = property.get('value');
}
else {
if (this.t.isObjectMethod(node)) {
throw property.buildCodeFrameError(`${invokedName} does not accept a method for ${propertyName}`);
}
let valuePath = property.get('value');
if (!valuePath.isExpression()) {
throw valuePath.buildCodeFrameError(`must be an expression`);
}
result[propertyName] = this.parseExpression(invokedName, valuePath);
}
});
return result;
}
get t() {
return this.babel.types;
}
}
function name(node) {
if (node.type === 'StringLiteral') {
return node.value;
}
else {
return node.name;
}
}
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type { NodePath } from '@babel/traverse';\nimport type * as Babel from '@babel/core';\nimport type { types as t } from '@babel/core';\nimport { ScopeLocals } from './scope-locals.js';\n\nexport class ExpressionParser {\n  constructor(private babel: typeof Babel) {}\n\n  parseExpression(invokedName: string, path: NodePath<t.Expression>): unknown {\n    switch (path.node.type) {\n      case 'ObjectExpression':\n        return this.parseObjectExpression(invokedName, path as NodePath<t.ObjectExpression>);\n      case 'ArrayExpression': {\n        return this.parseArrayExpression(invokedName, path as NodePath<t.ArrayExpression>);\n      }\n      case 'StringLiteral':\n      case 'BooleanLiteral':\n      case 'NumericLiteral':\n        return path.node.value;\n      default:\n        throw path.buildCodeFrameError(\n          `${invokedName} can only accept static options but you passed ${JSON.stringify(\n            path.node\n          )}`\n        );\n    }\n  }\n\n  parseArrayExpression(invokedName: string, path: NodePath<t.ArrayExpression>) {\n    return path.get('elements').map((element) => {\n      if (element.isSpreadElement()) {\n        throw element.buildCodeFrameError(`spread element is not allowed here`);\n      } else if (element.isExpression()) {\n        return this.parseExpression(invokedName, element);\n      }\n      return null;\n    });\n  }\n\n  parseScope(invokedName: string, path: NodePath<t.ObjectProperty | t.ObjectMethod>): ScopeLocals {\n    let body: t.BlockStatement | t.Expression | undefined = undefined;\n\n    if (path.node.type === 'ObjectMethod') {\n      body = path.node.body;\n    } else {\n      let { value } = path.node;\n      if (this.t.isObjectExpression(value)) {\n        throw path.buildCodeFrameError(\n          `Passing an object as the \\`scope\\` property to inline templates is no longer supported. Please pass a function that returns an object expression instead.`\n        );\n      }\n      if (this.t.isFunctionExpression(value) || this.t.isArrowFunctionExpression(value)) {\n        body = value.body;\n      }\n    }\n\n    let objExpression: t.Expression | undefined | null = undefined;\n\n    if (body?.type === 'ObjectExpression') {\n      objExpression = body;\n    } else if (body?.type === 'BlockStatement') {\n      // SAFETY: We know that the body is a ReturnStatement because we're checking inside\n      let returnStatements = body.body.filter(\n        (statement) => statement.type === 'ReturnStatement'\n      ) as Babel.types.ReturnStatement[];\n\n      if (returnStatements.length !== 1) {\n        throw new Error(\n          'Scope functions must have a single return statement which returns an object expression containing references to in-scope values'\n        );\n      }\n\n      objExpression = returnStatements[0].argument;\n    }\n\n    if (objExpression?.type !== 'ObjectExpression') {\n      throw path.buildCodeFrameError(\n        `Scope objects for \\`${invokedName}\\` must be an object expression containing only references to in-scope values, or a function that returns an object expression containing only references to in-scope values`\n      );\n    }\n\n    return objExpression.properties.reduce(\n      (res, prop) => {\n        if (this.t.isSpreadElement(prop)) {\n          throw path.buildCodeFrameError(\n            `Scope objects for \\`${invokedName}\\` may not contain spread elements`\n          );\n        }\n        if (this.t.isObjectMethod(prop)) {\n          throw path.buildCodeFrameError(\n            `Scope objects for \\`${invokedName}\\` may not contain methods`\n          );\n        }\n\n        let { key, value } = prop;\n        if (!this.t.isStringLiteral(key) && !this.t.isIdentifier(key)) {\n          throw path.buildCodeFrameError(\n            `Scope objects for \\`${invokedName}\\` may only contain static property names`\n          );\n        }\n\n        let propName = name(key);\n\n        switch (value.type) {\n          case 'Identifier':\n            res.add(propName, value.name);\n            break;\n          case 'ThisExpression':\n            res.add(propName, 'this');\n            break;\n          default:\n            throw path.buildCodeFrameError(\n              `Scope objects for \\`${invokedName}\\` may only contain direct references to in-scope values, e.g. { ${propName} } or { ${propName}: ${propName} }. Found ${value.type}`\n            );\n        }\n        return res;\n      },\n      new ScopeLocals({ mode: 'explicit' })\n    );\n  }\n\n  parseEval(\n    invokedName: string,\n    path: NodePath<t.ObjectProperty | t.ObjectMethod>\n  ): { isEval: true } {\n    let body: NodePath<t.BlockStatement>;\n\n    if (path.isObjectMethod()) {\n      body = path.get('body');\n    } else if (path.isObjectProperty()) {\n      let value = path.get('value');\n      if (value.isFunctionExpression()) {\n        body = value.get('body');\n      } else {\n        throw path.buildCodeFrameError(\n          `unsupported syntax for \\`eval\\` parameter to \\`${invokedName}\\`. It must be an object method or a function.`\n        );\n      }\n    } else {\n      throw path.buildCodeFrameError(\n        `unsupported syntax for \\`eval\\` parameter to \\`${invokedName}\\`. It must be an object method or a function.`\n      );\n    }\n\n    let returnStatements = body\n      .get('body')\n      .filter((statement) => statement.isReturnStatement()) as NodePath<t.ReturnStatement>[];\n\n    if (returnStatements.length !== 1) {\n      throw body.buildCodeFrameError('eval function must have a single return statement');\n    }\n\n    let returnExpression = returnStatements[0].get('argument');\n\n    if (!returnExpression.isCallExpression()) {\n      throw returnStatements[0].buildCodeFrameError(\n        'eval function must return `eval(arguments[0])`. Found non-CallExpression.'\n      );\n    }\n\n    let callee = returnExpression.get('callee');\n    if (!callee.isIdentifier() || callee.node.name !== 'eval') {\n      throw returnExpression.buildCodeFrameError(\n        'eval function must return `eval(arguments[0])`. Found callee is not eval.'\n      );\n    }\n\n    let args = returnExpression.get('arguments');\n    if (args.length !== 1) {\n      throw returnExpression.buildCodeFrameError(\n        'eval function must return `eval(arguments[0])`. Found incorrect number of arguments.'\n      );\n    }\n    let arg = args[0];\n    if (!arg.isMemberExpression()) {\n      throw arg.buildCodeFrameError(\n        'eval function must return `eval(arguments[0])`. Found argument is non-MemberExpression.'\n      );\n    }\n    let obj = arg.get('object');\n    if (!obj.isIdentifier() || obj.node.name !== 'arguments') {\n      throw obj.buildCodeFrameError(\n        'eval function must return `eval(arguments[0])`. Found wrong argument to eval.'\n      );\n    }\n    let prop = arg.get('property');\n    if (!prop.isNumericLiteral() || prop.node.value !== 0) {\n      throw prop.buildCodeFrameError(\n        'eval function must return `eval(arguments[0])`. Found wrong property.'\n      );\n    }\n    return { isEval: true };\n  }\n\n  parseObjectExpression(\n    invokedName: string,\n    path: NodePath<t.ObjectExpression>,\n    shouldParseScope = false,\n    shouldSupportRFC931 = false\n  ) {\n    let result: Record<string, unknown> = {};\n\n    path.get('properties').forEach((property) => {\n      let { node } = property;\n      if (this.t.isSpreadElement(node)) {\n        throw property.buildCodeFrameError(`${invokedName} does not allow spread element`);\n      }\n\n      if (node.computed) {\n        throw property.buildCodeFrameError(`${invokedName} can only accept static property names`);\n      }\n\n      let { key } = node;\n      if (!this.t.isIdentifier(key) && !this.t.isStringLiteral(key)) {\n        throw property.buildCodeFrameError(`${invokedName} can only accept static property names`);\n      }\n\n      let propertyName = name(key);\n\n      if (shouldParseScope && propertyName === 'scope') {\n        result.scope = this.parseScope(invokedName, property as NodePath<typeof node>);\n      } else if (shouldSupportRFC931 && propertyName === 'eval') {\n        result.eval = this.parseEval(invokedName, property as NodePath<typeof node>);\n      } else if (shouldSupportRFC931 && propertyName === 'component') {\n        result.component = (property as NodePath<typeof node>).get('value');\n      } else {\n        if (this.t.isObjectMethod(node)) {\n          throw property.buildCodeFrameError(\n            `${invokedName} does not accept a method for ${propertyName}`\n          );\n        }\n        let valuePath = (property as NodePath<typeof node>).get('value');\n        if (!valuePath.isExpression()) {\n          throw valuePath.buildCodeFrameError(`must be an expression`);\n        }\n        result[propertyName] = this.parseExpression(invokedName, valuePath);\n      }\n    });\n\n    return result;\n  }\n\n  private get t() {\n    return this.babel.types;\n  }\n}\n\nfunction name(node: t.StringLiteral | t.Identifier): string {\n  if (node.type === 'StringLiteral') {\n    return node.value;\n  } else {\n    return node.name;\n  }\n}\n"]}