source: trip-planner-front/node_modules/@angular/compiler/esm2015/src/render3/view/util.js@ 188ee53

Last change on this file since 188ee53 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

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1/**
2 * @license
3 * Copyright Google LLC All Rights Reserved.
4 *
5 * Use of this source code is governed by an MIT-style license that can be
6 * found in the LICENSE file at https://angular.io/license
7 */
8import * as o from '../../output/output_ast';
9import { splitAtColon } from '../../util';
10import * as t from '../r3_ast';
11import { isI18nAttribute } from './i18n/util';
12/**
13 * Checks whether an object key contains potentially unsafe chars, thus the key should be wrapped in
14 * quotes. Note: we do not wrap all keys into quotes, as it may have impact on minification and may
15 * bot work in some cases when object keys are mangled by minifier.
16 *
17 * TODO(FW-1136): this is a temporary solution, we need to come up with a better way of working with
18 * inputs that contain potentially unsafe chars.
19 */
20const UNSAFE_OBJECT_KEY_NAME_REGEXP = /[-.]/;
21/** Name of the temporary to use during data binding */
22export const TEMPORARY_NAME = '_t';
23/** Name of the context parameter passed into a template function */
24export const CONTEXT_NAME = 'ctx';
25/** Name of the RenderFlag passed into a template function */
26export const RENDER_FLAGS = 'rf';
27/** The prefix reference variables */
28export const REFERENCE_PREFIX = '_r';
29/** The name of the implicit context reference */
30export const IMPLICIT_REFERENCE = '$implicit';
31/** Non bindable attribute name **/
32export const NON_BINDABLE_ATTR = 'ngNonBindable';
33/** Name for the variable keeping track of the context returned by `ɵɵrestoreView`. */
34export const RESTORED_VIEW_CONTEXT_NAME = 'restoredCtx';
35/**
36 * Creates an allocator for a temporary variable.
37 *
38 * A variable declaration is added to the statements the first time the allocator is invoked.
39 */
40export function temporaryAllocator(statements, name) {
41 let temp = null;
42 return () => {
43 if (!temp) {
44 statements.push(new o.DeclareVarStmt(TEMPORARY_NAME, undefined, o.DYNAMIC_TYPE));
45 temp = o.variable(name);
46 }
47 return temp;
48 };
49}
50export function unsupported(feature) {
51 if (this) {
52 throw new Error(`Builder ${this.constructor.name} doesn't support ${feature} yet`);
53 }
54 throw new Error(`Feature ${feature} is not supported yet`);
55}
56export function invalid(arg) {
57 throw new Error(`Invalid state: Visitor ${this.constructor.name} doesn't handle ${arg.constructor.name}`);
58}
59export function asLiteral(value) {
60 if (Array.isArray(value)) {
61 return o.literalArr(value.map(asLiteral));
62 }
63 return o.literal(value, o.INFERRED_TYPE);
64}
65export function conditionallyCreateMapObjectLiteral(keys, keepDeclared) {
66 if (Object.getOwnPropertyNames(keys).length > 0) {
67 return mapToExpression(keys, keepDeclared);
68 }
69 return null;
70}
71function mapToExpression(map, keepDeclared) {
72 return o.literalMap(Object.getOwnPropertyNames(map).map(key => {
73 // canonical syntax: `dirProp: publicProp`
74 // if there is no `:`, use dirProp = elProp
75 const value = map[key];
76 let declaredName;
77 let publicName;
78 let minifiedName;
79 let needsDeclaredName;
80 if (Array.isArray(value)) {
81 [publicName, declaredName] = value;
82 minifiedName = key;
83 needsDeclaredName = publicName !== declaredName;
84 }
85 else {
86 [declaredName, publicName] = splitAtColon(key, [key, value]);
87 minifiedName = declaredName;
88 // Only include the declared name if extracted from the key, i.e. the key contains a colon.
89 // Otherwise the declared name should be omitted even if it is different from the public name,
90 // as it may have already been minified.
91 needsDeclaredName = publicName !== declaredName && key.includes(':');
92 }
93 return {
94 key: minifiedName,
95 // put quotes around keys that contain potentially unsafe characters
96 quoted: UNSAFE_OBJECT_KEY_NAME_REGEXP.test(minifiedName),
97 value: (keepDeclared && needsDeclaredName) ?
98 o.literalArr([asLiteral(publicName), asLiteral(declaredName)]) :
99 asLiteral(publicName)
100 };
101 }));
102}
103/**
104 * Remove trailing null nodes as they are implied.
105 */
106export function trimTrailingNulls(parameters) {
107 while (o.isNull(parameters[parameters.length - 1])) {
108 parameters.pop();
109 }
110 return parameters;
111}
112export function getQueryPredicate(query, constantPool) {
113 if (Array.isArray(query.predicate)) {
114 let predicate = [];
115 query.predicate.forEach((selector) => {
116 // Each item in predicates array may contain strings with comma-separated refs
117 // (for ex. 'ref, ref1, ..., refN'), thus we extract individual refs and store them
118 // as separate array entities
119 const selectors = selector.split(',').map(token => o.literal(token.trim()));
120 predicate.push(...selectors);
121 });
122 return constantPool.getConstLiteral(o.literalArr(predicate), true);
123 }
124 else {
125 return query.predicate;
126 }
127}
128/**
129 * A representation for an object literal used during codegen of definition objects. The generic
130 * type `T` allows to reference a documented type of the generated structure, such that the
131 * property names that are set can be resolved to their documented declaration.
132 */
133export class DefinitionMap {
134 constructor() {
135 this.values = [];
136 }
137 set(key, value) {
138 if (value) {
139 this.values.push({ key: key, value, quoted: false });
140 }
141 }
142 toLiteralMap() {
143 return o.literalMap(this.values);
144 }
145}
146/**
147 * Extract a map of properties to values for a given element or template node, which can be used
148 * by the directive matching machinery.
149 *
150 * @param elOrTpl the element or template in question
151 * @return an object set up for directive matching. For attributes on the element/template, this
152 * object maps a property name to its (static) value. For any bindings, this map simply maps the
153 * property name to an empty string.
154 */
155export function getAttrsForDirectiveMatching(elOrTpl) {
156 const attributesMap = {};
157 if (elOrTpl instanceof t.Template && elOrTpl.tagName !== 'ng-template') {
158 elOrTpl.templateAttrs.forEach(a => attributesMap[a.name] = '');
159 }
160 else {
161 elOrTpl.attributes.forEach(a => {
162 if (!isI18nAttribute(a.name)) {
163 attributesMap[a.name] = a.value;
164 }
165 });
166 elOrTpl.inputs.forEach(i => {
167 attributesMap[i.name] = '';
168 });
169 elOrTpl.outputs.forEach(o => {
170 attributesMap[o.name] = '';
171 });
172 }
173 return attributesMap;
174}
175/** Returns a call expression to a chained instruction, e.g. `property(params[0])(params[1])`. */
176export function chainedInstruction(reference, calls, span) {
177 let expression = o.importExpr(reference, null, span);
178 if (calls.length > 0) {
179 for (let i = 0; i < calls.length; i++) {
180 expression = expression.callFn(calls[i], span);
181 }
182 }
183 else {
184 // Add a blank invocation, in case the `calls` array is empty.
185 expression = expression.callFn([], span);
186 }
187 return expression;
188}
189/**
190 * Gets the number of arguments expected to be passed to a generated instruction in the case of
191 * interpolation instructions.
192 * @param interpolation An interpolation ast
193 */
194export function getInterpolationArgsLength(interpolation) {
195 const { expressions, strings } = interpolation;
196 if (expressions.length === 1 && strings.length === 2 && strings[0] === '' && strings[1] === '') {
197 // If the interpolation has one interpolated value, but the prefix and suffix are both empty
198 // strings, we only pass one argument, to a special instruction like `propertyInterpolate` or
199 // `textInterpolate`.
200 return 1;
201 }
202 else {
203 return expressions.length + strings.length;
204 }
205}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {ConstantPool} from '../../constant_pool';\nimport {Interpolation} from '../../expression_parser/ast';\nimport * as o from '../../output/output_ast';\nimport {ParseSourceSpan} from '../../parse_util';\nimport {splitAtColon} from '../../util';\nimport * as t from '../r3_ast';\n\nimport {R3QueryMetadata} from './api';\nimport {isI18nAttribute} from './i18n/util';\n\n\n/**\n * Checks whether an object key contains potentially unsafe chars, thus the key should be wrapped in\n * quotes. Note: we do not wrap all keys into quotes, as it may have impact on minification and may\n * bot work in some cases when object keys are mangled by minifier.\n *\n * TODO(FW-1136): this is a temporary solution, we need to come up with a better way of working with\n * inputs that contain potentially unsafe chars.\n */\nconst UNSAFE_OBJECT_KEY_NAME_REGEXP = /[-.]/;\n\n/** Name of the temporary to use during data binding */\nexport const TEMPORARY_NAME = '_t';\n\n/** Name of the context parameter passed into a template function */\nexport const CONTEXT_NAME = 'ctx';\n\n/** Name of the RenderFlag passed into a template function */\nexport const RENDER_FLAGS = 'rf';\n\n/** The prefix reference variables */\nexport const REFERENCE_PREFIX = '_r';\n\n/** The name of the implicit context reference */\nexport const IMPLICIT_REFERENCE = '$implicit';\n\n/** Non bindable attribute name **/\nexport const NON_BINDABLE_ATTR = 'ngNonBindable';\n\n/** Name for the variable keeping track of the context returned by `ɵɵrestoreView`. */\nexport const RESTORED_VIEW_CONTEXT_NAME = 'restoredCtx';\n\n/**\n * Creates an allocator for a temporary variable.\n *\n * A variable declaration is added to the statements the first time the allocator is invoked.\n */\nexport function temporaryAllocator(statements: o.Statement[], name: string): () => o.ReadVarExpr {\n  let temp: o.ReadVarExpr|null = null;\n  return () => {\n    if (!temp) {\n      statements.push(new o.DeclareVarStmt(TEMPORARY_NAME, undefined, o.DYNAMIC_TYPE));\n      temp = o.variable(name);\n    }\n    return temp;\n  };\n}\n\n\nexport function unsupported(this: void|Function, feature: string): never {\n  if (this) {\n    throw new Error(`Builder ${this.constructor.name} doesn't support ${feature} yet`);\n  }\n  throw new Error(`Feature ${feature} is not supported yet`);\n}\n\nexport function invalid<T>(this: t.Visitor, arg: o.Expression|o.Statement|t.Node): never {\n  throw new Error(\n      `Invalid state: Visitor ${this.constructor.name} doesn't handle ${arg.constructor.name}`);\n}\n\nexport function asLiteral(value: any): o.Expression {\n  if (Array.isArray(value)) {\n    return o.literalArr(value.map(asLiteral));\n  }\n  return o.literal(value, o.INFERRED_TYPE);\n}\n\nexport function conditionallyCreateMapObjectLiteral(\n    keys: {[key: string]: string|string[]}, keepDeclared?: boolean): o.Expression|null {\n  if (Object.getOwnPropertyNames(keys).length > 0) {\n    return mapToExpression(keys, keepDeclared);\n  }\n  return null;\n}\n\nfunction mapToExpression(\n    map: {[key: string]: string|string[]}, keepDeclared?: boolean): o.Expression {\n  return o.literalMap(Object.getOwnPropertyNames(map).map(key => {\n    // canonical syntax: `dirProp: publicProp`\n    // if there is no `:`, use dirProp = elProp\n    const value = map[key];\n    let declaredName: string;\n    let publicName: string;\n    let minifiedName: string;\n    let needsDeclaredName: boolean;\n    if (Array.isArray(value)) {\n      [publicName, declaredName] = value;\n      minifiedName = key;\n      needsDeclaredName = publicName !== declaredName;\n    } else {\n      [declaredName, publicName] = splitAtColon(key, [key, value]);\n      minifiedName = declaredName;\n      // Only include the declared name if extracted from the key, i.e. the key contains a colon.\n      // Otherwise the declared name should be omitted even if it is different from the public name,\n      // as it may have already been minified.\n      needsDeclaredName = publicName !== declaredName && key.includes(':');\n    }\n    return {\n      key: minifiedName,\n      // put quotes around keys that contain potentially unsafe characters\n      quoted: UNSAFE_OBJECT_KEY_NAME_REGEXP.test(minifiedName),\n      value: (keepDeclared && needsDeclaredName) ?\n          o.literalArr([asLiteral(publicName), asLiteral(declaredName)]) :\n          asLiteral(publicName)\n    };\n  }));\n}\n\n/**\n *  Remove trailing null nodes as they are implied.\n */\nexport function trimTrailingNulls(parameters: o.Expression[]): o.Expression[] {\n  while (o.isNull(parameters[parameters.length - 1])) {\n    parameters.pop();\n  }\n  return parameters;\n}\n\nexport function getQueryPredicate(\n    query: R3QueryMetadata, constantPool: ConstantPool): o.Expression {\n  if (Array.isArray(query.predicate)) {\n    let predicate: o.Expression[] = [];\n    query.predicate.forEach((selector: string): void => {\n      // Each item in predicates array may contain strings with comma-separated refs\n      // (for ex. 'ref, ref1, ..., refN'), thus we extract individual refs and store them\n      // as separate array entities\n      const selectors = selector.split(',').map(token => o.literal(token.trim()));\n      predicate.push(...selectors);\n    });\n    return constantPool.getConstLiteral(o.literalArr(predicate), true);\n  } else {\n    return query.predicate;\n  }\n}\n\n/**\n * A representation for an object literal used during codegen of definition objects. The generic\n * type `T` allows to reference a documented type of the generated structure, such that the\n * property names that are set can be resolved to their documented declaration.\n */\nexport class DefinitionMap<T = any> {\n  values: {key: string, quoted: boolean, value: o.Expression}[] = [];\n\n  set(key: keyof T, value: o.Expression|null): void {\n    if (value) {\n      this.values.push({key: key as string, value, quoted: false});\n    }\n  }\n\n  toLiteralMap(): o.LiteralMapExpr {\n    return o.literalMap(this.values);\n  }\n}\n\n/**\n * Extract a map of properties to values for a given element or template node, which can be used\n * by the directive matching machinery.\n *\n * @param elOrTpl the element or template in question\n * @return an object set up for directive matching. For attributes on the element/template, this\n * object maps a property name to its (static) value. For any bindings, this map simply maps the\n * property name to an empty string.\n */\nexport function getAttrsForDirectiveMatching(elOrTpl: t.Element|\n                                             t.Template): {[name: string]: string} {\n  const attributesMap: {[name: string]: string} = {};\n\n\n  if (elOrTpl instanceof t.Template && elOrTpl.tagName !== 'ng-template') {\n    elOrTpl.templateAttrs.forEach(a => attributesMap[a.name] = '');\n  } else {\n    elOrTpl.attributes.forEach(a => {\n      if (!isI18nAttribute(a.name)) {\n        attributesMap[a.name] = a.value;\n      }\n    });\n\n    elOrTpl.inputs.forEach(i => {\n      attributesMap[i.name] = '';\n    });\n    elOrTpl.outputs.forEach(o => {\n      attributesMap[o.name] = '';\n    });\n  }\n\n  return attributesMap;\n}\n\n/** Returns a call expression to a chained instruction, e.g. `property(params[0])(params[1])`. */\nexport function chainedInstruction(\n    reference: o.ExternalReference, calls: o.Expression[][], span?: ParseSourceSpan|null) {\n  let expression = o.importExpr(reference, null, span) as o.Expression;\n\n  if (calls.length > 0) {\n    for (let i = 0; i < calls.length; i++) {\n      expression = expression.callFn(calls[i], span);\n    }\n  } else {\n    // Add a blank invocation, in case the `calls` array is empty.\n    expression = expression.callFn([], span);\n  }\n\n  return expression;\n}\n\n/**\n * Gets the number of arguments expected to be passed to a generated instruction in the case of\n * interpolation instructions.\n * @param interpolation An interpolation ast\n */\nexport function getInterpolationArgsLength(interpolation: Interpolation) {\n  const {expressions, strings} = interpolation;\n  if (expressions.length === 1 && strings.length === 2 && strings[0] === '' && strings[1] === '') {\n    // If the interpolation has one interpolated value, but the prefix and suffix are both empty\n    // strings, we only pass one argument, to a special instruction like `propertyInterpolate` or\n    // `textInterpolate`.\n    return 1;\n  } else {\n    return expressions.length + strings.length;\n  }\n}\n"]}
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