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/**

* @license

* Use of this source code is governed by an MIT-style license that can be

* found in the LICENSE file at https://angular.dev/license

import * as chars from './chars';

import {stringify} from './util';

export class ParseLocation {

constructor(

public file: ParseSourceFile,

public offset: number,

public line: number,

public col: number,

) {}

toString(): string {

return this.offset != null ? `${this.file.url}@${this.line}:${this.col}` : this.file.url;

}

moveBy(delta: number): ParseLocation {

const source = this.file.content;

const len = source.length;

let offset = this.offset;

let line = this.line;

let col = this.col;

while (offset > 0 && delta < 0) {

offset--;

delta++;

const ch = source.charCodeAt(offset);

if (ch == chars.$LF) {

line--;

const priorLine = source

.substring(0, offset - 1)

.lastIndexOf(String.fromCharCode(chars.$LF));

col = priorLine > 0 ? offset - priorLine : offset;

} else {

col--;

}

while (offset < len && delta > 0) {

const ch = source.charCodeAt(offset);

offset++;

delta--;

if (ch == chars.$LF) {

line++;

col = 0;

} else {

col++;

}

return new ParseLocation(this.file, offset, line, col);

}

// Return the source around the location

// Up to `maxChars` or `maxLines` on each side of the location

getContext(maxChars: number, maxLines: number): {before: string; after: string} | null {

const content = this.file.content;

let startOffset = this.offset;

if (startOffset != null) {

if (startOffset > content.length - 1) {

startOffset = content.length - 1;

}

let endOffset = startOffset;

let ctxChars = 0;

let ctxLines = 0;

while (ctxChars < maxChars && startOffset > 0) {

startOffset--;

ctxChars++;

if (content[startOffset] == '\n') {

if (++ctxLines == maxLines) {

break;

}

ctxChars = 0;

ctxLines = 0;

while (ctxChars < maxChars && endOffset < content.length - 1) {

endOffset++;

ctxChars++;

if (content[endOffset] == '\n') {

if (++ctxLines == maxLines) {

break;

}

return {

before: content.substring(startOffset, this.offset),

after: content.substring(this.offset, endOffset + 1),

};

}

return null;

}

export class ParseSourceFile {

constructor(

public content: string,

public url: string,

) {}

}

export class ParseSourceSpan {

/**

* Create an object that holds information about spans of tokens/nodes captured during

* lexing/parsing of text.

* @param start

* The location of the start of the span (having skipped leading trivia).

* Skipping leading trivia makes source-spans more "user friendly", since things like HTML

* elements will appear to begin at the start of the opening tag, rather than at the start of any

* leading trivia, which could include newlines.

* @param end

* The location of the end of the span.

* @param fullStart

* The start of the token without skipping the leading trivia.

* This is used by tooling that splits tokens further, such as extracting Angular interpolations

* from text tokens. Such tooling creates new source-spans relative to the original token's

* source-span. If leading trivia characters have been skipped then the new source-spans may be

* incorrectly offset.

* @param details

* Additional information (such as identifier names) that should be associated with the span.

constructor(

public start: ParseLocation,

public end: ParseLocation,

public fullStart: ParseLocation = start,

public details: string | null = null,

) {}

toString(): string {

return this.start.file.content.substring(this.start.offset, this.end.offset);

}

export enum ParseErrorLevel {

WARNING,

ERROR,

}

export class ParseError extends Error {

constructor(

/** Location of the error. */

readonly span: ParseSourceSpan,

/** Error message. */

readonly msg: string,

/** Severity level of the error. */

readonly level: ParseErrorLevel = ParseErrorLevel.ERROR,

/**

* Error that caused the error to be surfaced. For example, an error in a sub-expression that

* couldn't be parsed. Not guaranteed to be defined, but can be used to provide more context.

readonly relatedError?: unknown,

) {

super(msg);

// Extending `Error` ends up breaking some internal tests. This appears to be a known issue

// when extending errors in TS and the workaround is to explicitly set the prototype.

// https://stackoverflow.com/questions/41102060/typescript-extending-error-class

Object.setPrototypeOf(this, new.target.prototype);

}

contextualMessage(): string {

const ctx = this.span.start.getContext(100, 3);

return ctx

? `${this.msg} ("${ctx.before}[${ParseErrorLevel[this.level]} ->]${ctx.after}")`

: this.msg;

}

override toString(): string {

const details = this.span.details ? `, ${this.span.details}` : '';

return `${this.contextualMessage()}: ${this.span.start}${details}`;

}

/**

* Generates Source Span object for a given R3 Type for JIT mode.

* @param kind Component or Directive.

* @param typeName name of the Component or Directive.

* @param sourceUrl reference to Component or Directive source.

* @returns instance of ParseSourceSpan that represent a given Component or Directive.

export function r3JitTypeSourceSpan(

kind: string,

typeName: string,

sourceUrl: string,

): ParseSourceSpan {

const sourceFileName = `in ${kind} ${typeName} in ${sourceUrl}`;

const sourceFile = new ParseSourceFile('', sourceFileName);

return new ParseSourceSpan(

new ParseLocation(sourceFile, -1, -1, -1),

);

}

let _anonymousTypeIndex = 0;

export function identifierName(

compileIdentifier: CompileIdentifierMetadata | null | undefined,

): string | null {

if (!compileIdentifier || !compileIdentifier.reference) {

return null;

}

const ref = compileIdentifier.reference;

if (ref['__anonymousType']) {

return ref['__anonymousType'];

}

if (ref['__forward_ref__']) {

// We do not want to try to stringify a `forwardRef()` function because that would cause the

// inner function to be evaluated too early, defeating the whole point of the `forwardRef`.

return '__forward_ref__';

}

let identifier = stringify(ref);

if (identifier.indexOf('(') >= 0) {

// case: anonymous functions!

identifier = `anonymous_${_anonymousTypeIndex++}`;

ref['__anonymousType'] = identifier;

} else {

identifier = sanitizeIdentifier(identifier);

}

return identifier;

}

export interface CompileIdentifierMetadata {

reference: any;

}

export function sanitizeIdentifier(name: string): string {

return name.replace(/\W/g, '_');

}

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