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Copy pathparse_util.ts
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139 lines (122 loc) · 3.98 KB
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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import * as chars from './chars';
import {CompileIdentifierMetadata, identifierModuleUrl, identifierName} from './compile_metadata';
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.substr(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 {
constructor(
public start: ParseLocation, public end: ParseLocation, 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 {
constructor(
public span: ParseSourceSpan, public msg: string,
public level: ParseErrorLevel = ParseErrorLevel.ERROR) {}
contextualMessage(): string {
const ctx = this.span.start.getContext(100, 3);
return ctx ? ` ("${ctx.before}[${ParseErrorLevel[this.level]} ->]${ctx.after}")` : '';
}
toString(): string {
const details = this.span.details ? `, ${this.span.details}` : '';
return `${this.msg}${this.contextualMessage()}: ${this.span.start}${details}`;
}
}
export function typeSourceSpan(kind: string, type: CompileIdentifierMetadata): ParseSourceSpan {
const moduleUrl = identifierModuleUrl(type);
const sourceFileName = moduleUrl != null ? `in ${kind} ${identifierName(type)} in ${moduleUrl}` :
`in ${kind} ${identifierName(type)}`;
const sourceFile = new ParseSourceFile('', sourceFileName);
return new ParseSourceSpan(
new ParseLocation(sourceFile, -1, -1, -1), new ParseLocation(sourceFile, -1, -1, -1));
}