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denoland-deno/std/encoding/yaml/loader/loader.ts

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// Ported from js-yaml v3.13.1:
// https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
// Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
/* eslint-disable no-conditional-assignment */
/* eslint-disable max-len */
import { YAMLError } from "../error.ts";
import { Mark } from "../mark.ts";
import { Type } from "../type.ts";
import * as common from "../utils.ts";
import { LoaderState, LoaderStateOptions, ResultType } from "./loader_state.ts";
type Any = common.Any;
type ArrayObject<T = Any> = common.ArrayObject<T>;
const _hasOwnProperty = Object.prototype.hasOwnProperty;
const CONTEXT_FLOW_IN = 1;
const CONTEXT_FLOW_OUT = 2;
const CONTEXT_BLOCK_IN = 3;
const CONTEXT_BLOCK_OUT = 4;
const CHOMPING_CLIP = 1;
const CHOMPING_STRIP = 2;
const CHOMPING_KEEP = 3;
const PATTERN_NON_PRINTABLE = /[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x84\x86-\x9F\uFFFE\uFFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])|(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]/;
const PATTERN_NON_ASCII_LINE_BREAKS = /[\x85\u2028\u2029]/;
const PATTERN_FLOW_INDICATORS = /[,\[\]\{\}]/;
const PATTERN_TAG_HANDLE = /^(?:!|!!|![a-z\-]+!)$/i;
/* eslint-disable-next-line max-len */
const PATTERN_TAG_URI = /^(?:!|[^,\[\]\{\}])(?:%[0-9a-f]{2}|[0-9a-z\-#;\/\?:@&=\+\$,_\.!~\*'\(\)\[\]])*$/i;
function _class(obj: unknown): string {
return Object.prototype.toString.call(obj);
}
function isEOL(c: number): boolean {
return c === 0x0a /* LF */ || c === 0x0d /* CR */;
}
function isWhiteSpace(c: number): boolean {
return c === 0x09 /* Tab */ || c === 0x20 /* Space */;
}
function isWsOrEol(c: number): boolean {
return (
c === 0x09 /* Tab */ ||
c === 0x20 /* Space */ ||
c === 0x0a /* LF */ ||
c === 0x0d /* CR */
);
}
function isFlowIndicator(c: number): boolean {
return (
c === 0x2c /* , */ ||
c === 0x5b /* [ */ ||
c === 0x5d /* ] */ ||
c === 0x7b /* { */ ||
c === 0x7d /* } */
);
}
function fromHexCode(c: number): number {
if (0x30 /* 0 */ <= c && c <= 0x39 /* 9 */) {
return c - 0x30;
}
const lc = c | 0x20;
if (0x61 /* a */ <= lc && lc <= 0x66 /* f */) {
return lc - 0x61 + 10;
}
return -1;
}
function escapedHexLen(c: number): number {
if (c === 0x78 /* x */) {
return 2;
}
if (c === 0x75 /* u */) {
return 4;
}
if (c === 0x55 /* U */) {
return 8;
}
return 0;
}
function fromDecimalCode(c: number): number {
if (0x30 /* 0 */ <= c && c <= 0x39 /* 9 */) {
return c - 0x30;
}
return -1;
}
function simpleEscapeSequence(c: number): string {
/* eslint:disable:prettier */
return c === 0x30 /* 0 */
? "\x00"
: c === 0x61 /* a */
? "\x07"
: c === 0x62 /* b */
? "\x08"
: c === 0x74 /* t */
? "\x09"
: c === 0x09 /* Tab */
? "\x09"
: c === 0x6e /* n */
? "\x0A"
: c === 0x76 /* v */
? "\x0B"
: c === 0x66 /* f */
? "\x0C"
: c === 0x72 /* r */
? "\x0D"
: c === 0x65 /* e */
? "\x1B"
: c === 0x20 /* Space */
? " "
: c === 0x22 /* " */
? "\x22"
: c === 0x2f /* / */
? "/"
: c === 0x5c /* \ */
? "\x5C"
: c === 0x4e /* N */
? "\x85"
: c === 0x5f /* _ */
? "\xA0"
: c === 0x4c /* L */
? "\u2028"
: c === 0x50 /* P */
? "\u2029"
: "";
/* eslint:enable:prettier */
}
function charFromCodepoint(c: number): string {
if (c <= 0xffff) {
return String.fromCharCode(c);
}
// Encode UTF-16 surrogate pair
// https://en.wikipedia.org/wiki/UTF-16#Code_points_U.2B010000_to_U.2B10FFFF
return String.fromCharCode(
((c - 0x010000) >> 10) + 0xd800,
((c - 0x010000) & 0x03ff) + 0xdc00
);
}
const simpleEscapeCheck = new Array(256); // integer, for fast access
const simpleEscapeMap = new Array(256);
for (let i = 0; i < 256; i++) {
simpleEscapeCheck[i] = simpleEscapeSequence(i) ? 1 : 0;
simpleEscapeMap[i] = simpleEscapeSequence(i);
}
function generateError(state: LoaderState, message: string): YAMLError {
return new YAMLError(
message,
new Mark(
state.filename as string,
state.input,
state.position,
state.line,
state.position - state.lineStart
)
);
}
function throwError(state: LoaderState, message: string): never {
throw generateError(state, message);
}
function throwWarning(state: LoaderState, message: string): void {
if (state.onWarning) {
state.onWarning.call(null, generateError(state, message));
}
}
interface DirectiveHandlers {
[directive: string]: (
state: LoaderState,
name: string,
...args: unknown[]
) => void;
}
const directiveHandlers: DirectiveHandlers = {
YAML(state, _name, ...args: string[]) {
if (state.version !== null) {
return throwError(state, "duplication of %YAML directive");
}
if (args.length !== 1) {
return throwError(state, "YAML directive accepts exactly one argument");
}
const match = /^([0-9]+)\.([0-9]+)$/.exec(args[0]);
if (match === null) {
return throwError(state, "ill-formed argument of the YAML directive");
}
const major = parseInt(match[1], 10);
const minor = parseInt(match[2], 10);
if (major !== 1) {
return throwError(state, "unacceptable YAML version of the document");
}
state.version = args[0];
state.checkLineBreaks = minor < 2;
if (minor !== 1 && minor !== 2) {
return throwWarning(state, "unsupported YAML version of the document");
}
},
TAG(state, _name, ...args: string[]): void {
if (args.length !== 2) {
return throwError(state, "TAG directive accepts exactly two arguments");
}
const handle = args[0];
const prefix = args[1];
if (!PATTERN_TAG_HANDLE.test(handle)) {
return throwError(
state,
"ill-formed tag handle (first argument) of the TAG directive"
);
}
if (_hasOwnProperty.call(state.tagMap, handle)) {
return throwError(
state,
`there is a previously declared suffix for "${handle}" tag handle`
);
}
if (!PATTERN_TAG_URI.test(prefix)) {
return throwError(
state,
"ill-formed tag prefix (second argument) of the TAG directive"
);
}
if (typeof state.tagMap === "undefined") {
state.tagMap = {};
}
state.tagMap[handle] = prefix;
}
};
function captureSegment(
state: LoaderState,
start: number,
end: number,
checkJson: boolean
): void {
let result: string;
if (start < end) {
result = state.input.slice(start, end);
if (checkJson) {
for (
let position = 0, length = result.length;
position < length;
position++
) {
const character = result.charCodeAt(position);
if (
!(character === 0x09 || (0x20 <= character && character <= 0x10ffff))
) {
return throwError(state, "expected valid JSON character");
}
}
} else if (PATTERN_NON_PRINTABLE.test(result)) {
return throwError(state, "the stream contains non-printable characters");
}
state.result += result;
}
}
function mergeMappings(
state: LoaderState,
destination: ArrayObject,
source: ArrayObject,
overridableKeys: ArrayObject<boolean>
): void {
if (!common.isObject(source)) {
return throwError(
state,
"cannot merge mappings; the provided source object is unacceptable"
);
}
const keys = Object.keys(source);
for (let i = 0, len = keys.length; i < len; i++) {
const key = keys[i];
if (!_hasOwnProperty.call(destination, key)) {
destination[key] = (source as ArrayObject)[key];
overridableKeys[key] = true;
}
}
}
function storeMappingPair(
state: LoaderState,
result: ArrayObject | null,
overridableKeys: ArrayObject<boolean>,
keyTag: string | null,
keyNode: Any,
valueNode: unknown,
startLine?: number,
startPos?: number
): ArrayObject {
// The output is a plain object here, so keys can only be strings.
// We need to convert keyNode to a string, but doing so can hang the process
// (deeply nested arrays that explode exponentially using aliases).
if (Array.isArray(keyNode)) {
keyNode = Array.prototype.slice.call(keyNode);
for (let index = 0, quantity = keyNode.length; index < quantity; index++) {
if (Array.isArray(keyNode[index])) {
return throwError(state, "nested arrays are not supported inside keys");
}
if (
typeof keyNode === "object" &&
_class(keyNode[index]) === "[object Object]"
) {
keyNode[index] = "[object Object]";
}
}
}
// Avoid code execution in load() via toString property
// (still use its own toString for arrays, timestamps,
// and whatever user schema extensions happen to have @@toStringTag)
if (typeof keyNode === "object" && _class(keyNode) === "[object Object]") {
keyNode = "[object Object]";
}
keyNode = String(keyNode);
if (result === null) {
result = {};
}
if (keyTag === "tag:yaml.org,2002:merge") {
if (Array.isArray(valueNode)) {
for (
let index = 0, quantity = valueNode.length;
index < quantity;
index++
) {
mergeMappings(state, result, valueNode[index], overridableKeys);
}
} else {
mergeMappings(state, result, valueNode, overridableKeys);
}
} else {
if (
!state.json &&
!_hasOwnProperty.call(overridableKeys, keyNode) &&
_hasOwnProperty.call(result, keyNode)
) {
state.line = startLine || state.line;
state.position = startPos || state.position;
return throwError(state, "duplicated mapping key");
}
result[keyNode] = valueNode;
delete overridableKeys[keyNode];
}
return result;
}
function readLineBreak(state: LoaderState): void {
const ch = state.input.charCodeAt(state.position);
if (ch === 0x0a /* LF */) {
state.position++;
} else if (ch === 0x0d /* CR */) {
state.position++;
if (state.input.charCodeAt(state.position) === 0x0a /* LF */) {
state.position++;
}
} else {
return throwError(state, "a line break is expected");
}
state.line += 1;
state.lineStart = state.position;
}
function skipSeparationSpace(
state: LoaderState,
allowComments: boolean,
checkIndent: number
): number {
let lineBreaks = 0,
ch = state.input.charCodeAt(state.position);
while (ch !== 0) {
while (isWhiteSpace(ch)) {
ch = state.input.charCodeAt(++state.position);
}
if (allowComments && ch === 0x23 /* # */) {
do {
ch = state.input.charCodeAt(++state.position);
} while (ch !== 0x0a /* LF */ && ch !== 0x0d /* CR */ && ch !== 0);
}
if (isEOL(ch)) {
readLineBreak(state);
ch = state.input.charCodeAt(state.position);
lineBreaks++;
state.lineIndent = 0;
while (ch === 0x20 /* Space */) {
state.lineIndent++;
ch = state.input.charCodeAt(++state.position);
}
} else {
break;
}
}
if (
checkIndent !== -1 &&
lineBreaks !== 0 &&
state.lineIndent < checkIndent
) {
throwWarning(state, "deficient indentation");
}
return lineBreaks;
}
function testDocumentSeparator(state: LoaderState): boolean {
let _position = state.position;
let ch = state.input.charCodeAt(_position);
// Condition state.position === state.lineStart is tested
// in parent on each call, for efficiency. No needs to test here again.
if (
(ch === 0x2d /* - */ || ch === 0x2e) /* . */ &&
ch === state.input.charCodeAt(_position + 1) &&
ch === state.input.charCodeAt(_position + 2)
) {
_position += 3;
ch = state.input.charCodeAt(_position);
if (ch === 0 || isWsOrEol(ch)) {
return true;
}
}
return false;
}
function writeFoldedLines(state: LoaderState, count: number): void {
if (count === 1) {
state.result += " ";
} else if (count > 1) {
state.result += common.repeat("\n", count - 1);
}
}
function readPlainScalar(
state: LoaderState,
nodeIndent: number,
withinFlowCollection: boolean
): boolean {
const kind = state.kind;
const result = state.result;
let ch = state.input.charCodeAt(state.position);
if (
isWsOrEol(ch) ||
isFlowIndicator(ch) ||
ch === 0x23 /* # */ ||
ch === 0x26 /* & */ ||
ch === 0x2a /* * */ ||
ch === 0x21 /* ! */ ||
ch === 0x7c /* | */ ||
ch === 0x3e /* > */ ||
ch === 0x27 /* ' */ ||
ch === 0x22 /* " */ ||
ch === 0x25 /* % */ ||
ch === 0x40 /* @ */ ||
ch === 0x60 /* ` */
) {
return false;
}
let following: number;
if (ch === 0x3f /* ? */ || ch === 0x2d /* - */) {
following = state.input.charCodeAt(state.position + 1);
if (
isWsOrEol(following) ||
(withinFlowCollection && isFlowIndicator(following))
) {
return false;
}
}
state.kind = "scalar";
state.result = "";
let captureEnd: number,
captureStart = (captureEnd = state.position);
let hasPendingContent = false;
let line = 0;
while (ch !== 0) {
if (ch === 0x3a /* : */) {
following = state.input.charCodeAt(state.position + 1);
if (
isWsOrEol(following) ||
(withinFlowCollection && isFlowIndicator(following))
) {
break;
}
} else if (ch === 0x23 /* # */) {
const preceding = state.input.charCodeAt(state.position - 1);
if (isWsOrEol(preceding)) {
break;
}
} else if (
(state.position === state.lineStart && testDocumentSeparator(state)) ||
(withinFlowCollection && isFlowIndicator(ch))
) {
break;
} else if (isEOL(ch)) {
line = state.line;
const lineStart = state.lineStart;
const lineIndent = state.lineIndent;
skipSeparationSpace(state, false, -1);
if (state.lineIndent >= nodeIndent) {
hasPendingContent = true;
ch = state.input.charCodeAt(state.position);
continue;
} else {
state.position = captureEnd;
state.line = line;
state.lineStart = lineStart;
state.lineIndent = lineIndent;
break;
}
}
if (hasPendingContent) {
captureSegment(state, captureStart, captureEnd, false);
writeFoldedLines(state, state.line - line);
captureStart = captureEnd = state.position;
hasPendingContent = false;
}
if (!isWhiteSpace(ch)) {
captureEnd = state.position + 1;
}
ch = state.input.charCodeAt(++state.position);
}
captureSegment(state, captureStart, captureEnd, false);
if (!common.isNullOrUndefined(state.result)) {
return true;
}
state.kind = kind;
state.result = result;
return false;
}
function readSingleQuotedScalar(
state: LoaderState,
nodeIndent: number
): boolean {
let ch, captureStart, captureEnd;
ch = state.input.charCodeAt(state.position);
if (ch !== 0x27 /* ' */) {
return false;
}
state.kind = "scalar";
state.result = "";
state.position++;
captureStart = captureEnd = state.position;
while ((ch = state.input.charCodeAt(state.position)) !== 0) {
if (ch === 0x27 /* ' */) {
captureSegment(state, captureStart, state.position, true);
ch = state.input.charCodeAt(++state.position);
if (ch === 0x27 /* ' */) {
captureStart = state.position;
state.position++;
captureEnd = state.position;
} else {
return true;
}
} else if (isEOL(ch)) {
captureSegment(state, captureStart, captureEnd, true);
writeFoldedLines(state, skipSeparationSpace(state, false, nodeIndent));
captureStart = captureEnd = state.position;
} else if (
state.position === state.lineStart &&
testDocumentSeparator(state)
) {
return throwError(
state,
"unexpected end of the document within a single quoted scalar"
);
} else {
state.position++;
captureEnd = state.position;
}
}
return throwError(
state,
"unexpected end of the stream within a single quoted scalar"
);
}
function readDoubleQuotedScalar(
state: LoaderState,
nodeIndent: number
): boolean {
let ch = state.input.charCodeAt(state.position);
if (ch !== 0x22 /* " */) {
return false;
}
state.kind = "scalar";
state.result = "";
state.position++;
let captureEnd: number,
captureStart = (captureEnd = state.position);
let tmp: number;
while ((ch = state.input.charCodeAt(state.position)) !== 0) {
if (ch === 0x22 /* " */) {
captureSegment(state, captureStart, state.position, true);
state.position++;
return true;
}
if (ch === 0x5c /* \ */) {
captureSegment(state, captureStart, state.position, true);
ch = state.input.charCodeAt(++state.position);
if (isEOL(ch)) {
skipSeparationSpace(state, false, nodeIndent);
// TODO: rework to inline fn with no type cast?
} else if (ch < 256 && simpleEscapeCheck[ch]) {
state.result += simpleEscapeMap[ch];
state.position++;
} else if ((tmp = escapedHexLen(ch)) > 0) {
let hexLength = tmp;
let hexResult = 0;
for (; hexLength > 0; hexLength--) {
ch = state.input.charCodeAt(++state.position);
if ((tmp = fromHexCode(ch)) >= 0) {
hexResult = (hexResult << 4) + tmp;
} else {
return throwError(state, "expected hexadecimal character");
}
}
state.result += charFromCodepoint(hexResult);
state.position++;
} else {
return throwError(state, "unknown escape sequence");
}
captureStart = captureEnd = state.position;
} else if (isEOL(ch)) {
captureSegment(state, captureStart, captureEnd, true);
writeFoldedLines(state, skipSeparationSpace(state, false, nodeIndent));
captureStart = captureEnd = state.position;
} else if (
state.position === state.lineStart &&
testDocumentSeparator(state)
) {
return throwError(
state,
"unexpected end of the document within a double quoted scalar"
);
} else {
state.position++;
captureEnd = state.position;
}
}
return throwError(
state,
"unexpected end of the stream within a double quoted scalar"
);
}
function readFlowCollection(state: LoaderState, nodeIndent: number): boolean {
let ch = state.input.charCodeAt(state.position);
let terminator: number;
let isMapping = true;
let result: ResultType = {};
if (ch === 0x5b /* [ */) {
terminator = 0x5d; /* ] */
isMapping = false;
result = [];
} else if (ch === 0x7b /* { */) {
terminator = 0x7d; /* } */
} else {
return false;
}
if (
state.anchor !== null &&
typeof state.anchor != "undefined" &&
typeof state.anchorMap != "undefined"
) {
state.anchorMap[state.anchor] = result;
}
ch = state.input.charCodeAt(++state.position);
const tag = state.tag,
anchor = state.anchor;
let readNext = true;
let valueNode,
keyNode,
keyTag: string | null = (keyNode = valueNode = null),
isExplicitPair: boolean,
isPair = (isExplicitPair = false);
let following = 0,
line = 0;
const overridableKeys: ArrayObject<boolean> = {};
while (ch !== 0) {
skipSeparationSpace(state, true, nodeIndent);
ch = state.input.charCodeAt(state.position);
if (ch === terminator) {
state.position++;
state.tag = tag;
state.anchor = anchor;
state.kind = isMapping ? "mapping" : "sequence";
state.result = result;
return true;
}
if (!readNext) {
return throwError(state, "missed comma between flow collection entries");
}
keyTag = keyNode = valueNode = null;
isPair = isExplicitPair = false;
if (ch === 0x3f /* ? */) {
following = state.input.charCodeAt(state.position + 1);
if (isWsOrEol(following)) {
isPair = isExplicitPair = true;
state.position++;
skipSeparationSpace(state, true, nodeIndent);
}
}
line = state.line;
// eslint-disable-next-line @typescript-eslint/no-use-before-define
composeNode(state, nodeIndent, CONTEXT_FLOW_IN, false, true);
keyTag = state.tag || null;
keyNode = state.result;
skipSeparationSpace(state, true, nodeIndent);
ch = state.input.charCodeAt(state.position);
if ((isExplicitPair || state.line === line) && ch === 0x3a /* : */) {
isPair = true;
ch = state.input.charCodeAt(++state.position);
skipSeparationSpace(state, true, nodeIndent);
// eslint-disable-next-line @typescript-eslint/no-use-before-define
composeNode(state, nodeIndent, CONTEXT_FLOW_IN, false, true);
valueNode = state.result;
}
if (isMapping) {
storeMappingPair(
state,
result,
overridableKeys,
keyTag,
keyNode,
valueNode
);
} else if (isPair) {
(result as Array<{}>).push(
storeMappingPair(
state,
null,
overridableKeys,
keyTag,
keyNode,
valueNode
)
);
} else {
(result as ResultType[]).push(keyNode as ResultType);
}
skipSeparationSpace(state, true, nodeIndent);
ch = state.input.charCodeAt(state.position);
if (ch === 0x2c /* , */) {
readNext = true;
ch = state.input.charCodeAt(++state.position);
} else {
readNext = false;
}
}
return throwError(
state,
"unexpected end of the stream within a flow collection"
);
}
function readBlockScalar(state: LoaderState, nodeIndent: number): boolean {
let chomping = CHOMPING_CLIP,
didReadContent = false,
detectedIndent = false,
textIndent = nodeIndent,
emptyLines = 0,
atMoreIndented = false;
let ch = state.input.charCodeAt(state.position);
let folding = false;
if (ch === 0x7c /* | */) {
folding = false;
} else if (ch === 0x3e /* > */) {
folding = true;
} else {
return false;
}
state.kind = "scalar";
state.result = "";
let tmp = 0;
while (ch !== 0) {
ch = state.input.charCodeAt(++state.position);
if (ch === 0x2b /* + */ || ch === 0x2d /* - */) {
if (CHOMPING_CLIP === chomping) {
chomping = ch === 0x2b /* + */ ? CHOMPING_KEEP : CHOMPING_STRIP;
} else {
return throwError(state, "repeat of a chomping mode identifier");
}
} else if ((tmp = fromDecimalCode(ch)) >= 0) {
if (tmp === 0) {
return throwError(
state,
"bad explicit indentation width of a block scalar; it cannot be less than one"
);
} else if (!detectedIndent) {
textIndent = nodeIndent + tmp - 1;
detectedIndent = true;
} else {
return throwError(state, "repeat of an indentation width identifier");
}
} else {
break;
}
}
if (isWhiteSpace(ch)) {
do {
ch = state.input.charCodeAt(++state.position);
} while (isWhiteSpace(ch));
if (ch === 0x23 /* # */) {
do {
ch = state.input.charCodeAt(++state.position);
} while (!isEOL(ch) && ch !== 0);
}
}
while (ch !== 0) {
readLineBreak(state);
state.lineIndent = 0;
ch = state.input.charCodeAt(state.position);
while (
(!detectedIndent || state.lineIndent < textIndent) &&
ch === 0x20 /* Space */
) {
state.lineIndent++;
ch = state.input.charCodeAt(++state.position);
}
if (!detectedIndent && state.lineIndent > textIndent) {
textIndent = state.lineIndent;
}
if (isEOL(ch)) {
emptyLines++;
continue;
}
// End of the scalar.
if (state.lineIndent < textIndent) {
// Perform the chomping.
if (chomping === CHOMPING_KEEP) {
state.result += common.repeat(
"\n",
didReadContent ? 1 + emptyLines : emptyLines
);
} else if (chomping === CHOMPING_CLIP) {
if (didReadContent) {
// i.e. only if the scalar is not empty.
state.result += "\n";
}
}
// Break this `while` cycle and go to the funciton's epilogue.
break;
}
// Folded style: use fancy rules to handle line breaks.
if (folding) {
// Lines starting with white space characters (more-indented lines) are not folded.
if (isWhiteSpace(ch)) {
atMoreIndented = true;
// except for the first content line (cf. Example 8.1)
state.result += common.repeat(
"\n",
didReadContent ? 1 + emptyLines : emptyLines
);
// End of more-indented block.
} else if (atMoreIndented) {
atMoreIndented = false;
state.result += common.repeat("\n", emptyLines + 1);
// Just one line break - perceive as the same line.
} else if (emptyLines === 0) {
if (didReadContent) {
// i.e. only if we have already read some scalar content.
state.result += " ";
}
// Several line breaks - perceive as different lines.
} else {
state.result += common.repeat("\n", emptyLines);
}
// Literal style: just add exact number of line breaks between content lines.
} else {
// Keep all line breaks except the header line break.
state.result += common.repeat(
"\n",
didReadContent ? 1 + emptyLines : emptyLines
);
}
didReadContent = true;
detectedIndent = true;
emptyLines = 0;
const captureStart = state.position;
while (!isEOL(ch) && ch !== 0) {
ch = state.input.charCodeAt(++state.position);
}
captureSegment(state, captureStart, state.position, false);
}
return true;
}
function readBlockSequence(state: LoaderState, nodeIndent: number): boolean {
let line: number,
following: number,
detected = false,
ch: number;
const tag = state.tag,
anchor = state.anchor,
result: unknown[] = [];
if (
state.anchor !== null &&
typeof state.anchor !== "undefined" &&
typeof state.anchorMap !== "undefined"
) {
state.anchorMap[state.anchor] = result;
}
ch = state.input.charCodeAt(state.position);
while (ch !== 0) {
if (ch !== 0x2d /* - */) {
break;
}
following = state.input.charCodeAt(state.position + 1);
if (!isWsOrEol(following)) {
break;
}
detected = true;
state.position++;
if (skipSeparationSpace(state, true, -1)) {
if (state.lineIndent <= nodeIndent) {
result.push(null);
ch = state.input.charCodeAt(state.position);
continue;
}
}
line = state.line;
// eslint-disable-next-line @typescript-eslint/no-use-before-define
composeNode(state, nodeIndent, CONTEXT_BLOCK_IN, false, true);
result.push(state.result);
skipSeparationSpace(state, true, -1);
ch = state.input.charCodeAt(state.position);
if ((state.line === line || state.lineIndent > nodeIndent) && ch !== 0) {
return throwError(state, "bad indentation of a sequence entry");
} else if (state.lineIndent < nodeIndent) {
break;
}
}
if (detected) {
state.tag = tag;
state.anchor = anchor;
state.kind = "sequence";
state.result = result;
return true;
}
return false;
}
function readBlockMapping(
state: LoaderState,
nodeIndent: number,
flowIndent: number
): boolean {
const tag = state.tag,
anchor = state.anchor,
result = {},
overridableKeys = {};
let following: number,
allowCompact = false,
line: number,
pos: number,
keyTag = null,
keyNode = null,
valueNode = null,
atExplicitKey = false,
detected = false,
ch: number;
if (
state.anchor !== null &&
typeof state.anchor !== "undefined" &&
typeof state.anchorMap !== "undefined"
) {
state.anchorMap[state.anchor] = result;
}
ch = state.input.charCodeAt(state.position);
while (ch !== 0) {
following = state.input.charCodeAt(state.position + 1);
line = state.line; // Save the current line.
pos = state.position;
//
// Explicit notation case. There are two separate blocks:
// first for the key (denoted by "?") and second for the value (denoted by ":")
//
if ((ch === 0x3f /* ? */ || ch === 0x3a) /* : */ && isWsOrEol(following)) {
if (ch === 0x3f /* ? */) {
if (atExplicitKey) {
storeMappingPair(
state,
result,
overridableKeys,
keyTag as string,
keyNode,
null
);
keyTag = keyNode = valueNode = null;
}
detected = true;
atExplicitKey = true;
allowCompact = true;
} else if (atExplicitKey) {
// i.e. 0x3A/* : */ === character after the explicit key.
atExplicitKey = false;
allowCompact = true;
} else {
return throwError(
state,
"incomplete explicit mapping pair; a key node is missed; or followed by a non-tabulated empty line"
);
}
state.position += 1;
ch = following;
//
// Implicit notation case. Flow-style node as the key first, then ":", and the value.
//
// eslint-disable-next-line @typescript-eslint/no-use-before-define
} else if (composeNode(state, flowIndent, CONTEXT_FLOW_OUT, false, true)) {
if (state.line === line) {
ch = state.input.charCodeAt(state.position);
while (isWhiteSpace(ch)) {
ch = state.input.charCodeAt(++state.position);
}
if (ch === 0x3a /* : */) {
ch = state.input.charCodeAt(++state.position);
if (!isWsOrEol(ch)) {
return throwError(
state,
"a whitespace character is expected after the key-value separator within a block mapping"
);
}
if (atExplicitKey) {
storeMappingPair(
state,
result,
overridableKeys,
keyTag as string,
keyNode,
null
);
keyTag = keyNode = valueNode = null;
}
detected = true;
atExplicitKey = false;
allowCompact = false;
keyTag = state.tag;
keyNode = state.result;
} else if (detected) {
return throwError(
state,
"can not read an implicit mapping pair; a colon is missed"
);
} else {
state.tag = tag;
state.anchor = anchor;
return true; // Keep the result of `composeNode`.
}
} else if (detected) {
return throwError(
state,
"can not read a block mapping entry; a multiline key may not be an implicit key"
);
} else {
state.tag = tag;
state.anchor = anchor;
return true; // Keep the result of `composeNode`.
}
} else {
break; // Reading is done. Go to the epilogue.
}
//
// Common reading code for both explicit and implicit notations.
//
if (state.line === line || state.lineIndent > nodeIndent) {
if (
// eslint-disable-next-line @typescript-eslint/no-use-before-define
composeNode(state, nodeIndent, CONTEXT_BLOCK_OUT, true, allowCompact)
) {
if (atExplicitKey) {
keyNode = state.result;
} else {
valueNode = state.result;
}
}
if (!atExplicitKey) {
storeMappingPair(
state,
result,
overridableKeys,
keyTag as string,
keyNode,
valueNode,
line,
pos
);
keyTag = keyNode = valueNode = null;
}
skipSeparationSpace(state, true, -1);
ch = state.input.charCodeAt(state.position);
}
if (state.lineIndent > nodeIndent && ch !== 0) {
return throwError(state, "bad indentation of a mapping entry");
} else if (state.lineIndent < nodeIndent) {
break;
}
}
//
// Epilogue.
//
// Special case: last mapping's node contains only the key in explicit notation.
if (atExplicitKey) {
storeMappingPair(
state,
result,
overridableKeys,
keyTag as string,
keyNode,
null
);
}
// Expose the resulting mapping.
if (detected) {
state.tag = tag;
state.anchor = anchor;
state.kind = "mapping";
state.result = result;
}
return detected;
}
function readTagProperty(state: LoaderState): boolean {
let position: number,
isVerbatim = false,
isNamed = false,
tagHandle = "",
tagName: string,
ch: number;
ch = state.input.charCodeAt(state.position);
if (ch !== 0x21 /* ! */) return false;
if (state.tag !== null) {
return throwError(state, "duplication of a tag property");
}
ch = state.input.charCodeAt(++state.position);
if (ch === 0x3c /* < */) {
isVerbatim = true;
ch = state.input.charCodeAt(++state.position);
} else if (ch === 0x21 /* ! */) {
isNamed = true;
tagHandle = "!!";
ch = state.input.charCodeAt(++state.position);
} else {
tagHandle = "!";
}
position = state.position;
if (isVerbatim) {
do {
ch = state.input.charCodeAt(++state.position);
} while (ch !== 0 && ch !== 0x3e /* > */);
if (state.position < state.length) {
tagName = state.input.slice(position, state.position);
ch = state.input.charCodeAt(++state.position);
} else {
return throwError(
state,
"unexpected end of the stream within a verbatim tag"
);
}
} else {
while (ch !== 0 && !isWsOrEol(ch)) {
if (ch === 0x21 /* ! */) {
if (!isNamed) {
tagHandle = state.input.slice(position - 1, state.position + 1);
if (!PATTERN_TAG_HANDLE.test(tagHandle)) {
return throwError(
state,
"named tag handle cannot contain such characters"
);
}
isNamed = true;
position = state.position + 1;
} else {
return throwError(
state,
"tag suffix cannot contain exclamation marks"
);
}
}
ch = state.input.charCodeAt(++state.position);
}
tagName = state.input.slice(position, state.position);
if (PATTERN_FLOW_INDICATORS.test(tagName)) {
return throwError(
state,
"tag suffix cannot contain flow indicator characters"
);
}
}
if (tagName && !PATTERN_TAG_URI.test(tagName)) {
return throwError(
state,
`tag name cannot contain such characters: ${tagName}`
);
}
if (isVerbatim) {
state.tag = tagName;
} else if (
typeof state.tagMap !== "undefined" &&
_hasOwnProperty.call(state.tagMap, tagHandle)
) {
state.tag = state.tagMap[tagHandle] + tagName;
} else if (tagHandle === "!") {
state.tag = `!${tagName}`;
} else if (tagHandle === "!!") {
state.tag = `tag:yaml.org,2002:${tagName}`;
} else {
return throwError(state, `undeclared tag handle "${tagHandle}"`);
}
return true;
}
function readAnchorProperty(state: LoaderState): boolean {
let ch = state.input.charCodeAt(state.position);
if (ch !== 0x26 /* & */) return false;
if (state.anchor !== null) {
return throwError(state, "duplication of an anchor property");
}
ch = state.input.charCodeAt(++state.position);
const position = state.position;
while (ch !== 0 && !isWsOrEol(ch) && !isFlowIndicator(ch)) {
ch = state.input.charCodeAt(++state.position);
}
if (state.position === position) {
return throwError(
state,
"name of an anchor node must contain at least one character"
);
}
state.anchor = state.input.slice(position, state.position);
return true;
}
function readAlias(state: LoaderState): boolean {
let ch = state.input.charCodeAt(state.position);
if (ch !== 0x2a /* * */) return false;
ch = state.input.charCodeAt(++state.position);
const _position = state.position;
while (ch !== 0 && !isWsOrEol(ch) && !isFlowIndicator(ch)) {
ch = state.input.charCodeAt(++state.position);
}
if (state.position === _position) {
return throwError(
state,
"name of an alias node must contain at least one character"
);
}
const alias = state.input.slice(_position, state.position);
if (
typeof state.anchorMap !== "undefined" &&
!state.anchorMap.hasOwnProperty(alias)
) {
return throwError(state, `unidentified alias "${alias}"`);
}
if (typeof state.anchorMap !== "undefined") {
state.result = state.anchorMap[alias];
}
skipSeparationSpace(state, true, -1);
return true;
}
function composeNode(
state: LoaderState,
parentIndent: number,
nodeContext: number,
allowToSeek: boolean,
allowCompact: boolean
): boolean {
let allowBlockScalars: boolean,
allowBlockCollections: boolean,
indentStatus = 1, // 1: this>parent, 0: this=parent, -1: this<parent
atNewLine = false,
hasContent = false,
type: Type,
flowIndent: number,
blockIndent: number;
if (state.listener && state.listener !== null) {
state.listener("open", state);
}
state.tag = null;
state.anchor = null;
state.kind = null;
state.result = null;
const allowBlockStyles = (allowBlockScalars = allowBlockCollections =
CONTEXT_BLOCK_OUT === nodeContext || CONTEXT_BLOCK_IN === nodeContext);
if (allowToSeek) {
if (skipSeparationSpace(state, true, -1)) {
atNewLine = true;
if (state.lineIndent > parentIndent) {
indentStatus = 1;
} else if (state.lineIndent === parentIndent) {
indentStatus = 0;
} else if (state.lineIndent < parentIndent) {
indentStatus = -1;
}
}
}
if (indentStatus === 1) {
while (readTagProperty(state) || readAnchorProperty(state)) {
if (skipSeparationSpace(state, true, -1)) {
atNewLine = true;
allowBlockCollections = allowBlockStyles;
if (state.lineIndent > parentIndent) {
indentStatus = 1;
} else if (state.lineIndent === parentIndent) {
indentStatus = 0;
} else if (state.lineIndent < parentIndent) {
indentStatus = -1;
}
} else {
allowBlockCollections = false;
}
}
}
if (allowBlockCollections) {
allowBlockCollections = atNewLine || allowCompact;
}
if (indentStatus === 1 || CONTEXT_BLOCK_OUT === nodeContext) {
const cond =
CONTEXT_FLOW_IN === nodeContext || CONTEXT_FLOW_OUT === nodeContext;
flowIndent = cond ? parentIndent : parentIndent + 1;
blockIndent = state.position - state.lineStart;
if (indentStatus === 1) {
if (
(allowBlockCollections &&
(readBlockSequence(state, blockIndent) ||
readBlockMapping(state, blockIndent, flowIndent))) ||
readFlowCollection(state, flowIndent)
) {
hasContent = true;
} else {
if (
(allowBlockScalars && readBlockScalar(state, flowIndent)) ||
readSingleQuotedScalar(state, flowIndent) ||
readDoubleQuotedScalar(state, flowIndent)
) {
hasContent = true;
} else if (readAlias(state)) {
hasContent = true;
if (state.tag !== null || state.anchor !== null) {
return throwError(
state,
"alias node should not have Any properties"
);
}
} else if (
readPlainScalar(state, flowIndent, CONTEXT_FLOW_IN === nodeContext)
) {
hasContent = true;
if (state.tag === null) {
state.tag = "?";
}
}
if (state.anchor !== null && typeof state.anchorMap !== "undefined") {
state.anchorMap[state.anchor] = state.result;
}
}
} else if (indentStatus === 0) {
// Special case: block sequences are allowed to have same indentation level as the parent.
// http://www.yaml.org/spec/1.2/spec.html#id2799784
hasContent =
allowBlockCollections && readBlockSequence(state, blockIndent);
}
}
if (state.tag !== null && state.tag !== "!") {
if (state.tag === "?") {
for (
let typeIndex = 0, typeQuantity = state.implicitTypes.length;
typeIndex < typeQuantity;
typeIndex++
) {
type = state.implicitTypes[typeIndex];
// Implicit resolving is not allowed for non-scalar types, and '?'
// non-specific tag is only assigned to plain scalars. So, it isn't
// needed to check for 'kind' conformity.
if (type.resolve(state.result)) {
// `state.result` updated in resolver if matched
state.result = type.construct(state.result);
state.tag = type.tag;
if (state.anchor !== null && typeof state.anchorMap !== "undefined") {
state.anchorMap[state.anchor] = state.result;
}
break;
}
}
} else if (
_hasOwnProperty.call(state.typeMap[state.kind || "fallback"], state.tag)
) {
type = state.typeMap[state.kind || "fallback"][state.tag];
if (state.result !== null && type.kind !== state.kind) {
return throwError(
state,
`unacceptable node kind for !<${state.tag}> tag; it should be "${type.kind}", not "${state.kind}"`
);
}
if (!type.resolve(state.result)) {
// `state.result` updated in resolver if matched
return throwError(
state,
`cannot resolve a node with !<${state.tag}> explicit tag`
);
} else {
state.result = type.construct(state.result);
if (state.anchor !== null && typeof state.anchorMap !== "undefined") {
state.anchorMap[state.anchor] = state.result;
}
}
} else {
return throwError(state, `unknown tag !<${state.tag}>`);
}
}
if (state.listener && state.listener !== null) {
state.listener("close", state);
}
return state.tag !== null || state.anchor !== null || hasContent;
}
function readDocument(state: LoaderState): void {
const documentStart = state.position;
let position: number,
directiveName: string,
directiveArgs: unknown[],
hasDirectives = false,
ch: number;
state.version = null;
state.checkLineBreaks = state.legacy;
state.tagMap = {};
state.anchorMap = {};
while ((ch = state.input.charCodeAt(state.position)) !== 0) {
skipSeparationSpace(state, true, -1);
ch = state.input.charCodeAt(state.position);
if (state.lineIndent > 0 || ch !== 0x25 /* % */) {
break;
}
hasDirectives = true;
ch = state.input.charCodeAt(++state.position);
position = state.position;
while (ch !== 0 && !isWsOrEol(ch)) {
ch = state.input.charCodeAt(++state.position);
}
directiveName = state.input.slice(position, state.position);
directiveArgs = [];
if (directiveName.length < 1) {
return throwError(
state,
"directive name must not be less than one character in length"
);
}
while (ch !== 0) {
while (isWhiteSpace(ch)) {
ch = state.input.charCodeAt(++state.position);
}
if (ch === 0x23 /* # */) {
do {
ch = state.input.charCodeAt(++state.position);
} while (ch !== 0 && !isEOL(ch));
break;
}
if (isEOL(ch)) break;
position = state.position;
while (ch !== 0 && !isWsOrEol(ch)) {
ch = state.input.charCodeAt(++state.position);
}
directiveArgs.push(state.input.slice(position, state.position));
}
if (ch !== 0) readLineBreak(state);
if (_hasOwnProperty.call(directiveHandlers, directiveName)) {
directiveHandlers[directiveName](state, directiveName, ...directiveArgs);
} else {
throwWarning(state, `unknown document directive "${directiveName}"`);
}
}
skipSeparationSpace(state, true, -1);
if (
state.lineIndent === 0 &&
state.input.charCodeAt(state.position) === 0x2d /* - */ &&
state.input.charCodeAt(state.position + 1) === 0x2d /* - */ &&
state.input.charCodeAt(state.position + 2) === 0x2d /* - */
) {
state.position += 3;
skipSeparationSpace(state, true, -1);
} else if (hasDirectives) {
return throwError(state, "directives end mark is expected");
}
composeNode(state, state.lineIndent - 1, CONTEXT_BLOCK_OUT, false, true);
skipSeparationSpace(state, true, -1);
if (
state.checkLineBreaks &&
PATTERN_NON_ASCII_LINE_BREAKS.test(
state.input.slice(documentStart, state.position)
)
) {
throwWarning(state, "non-ASCII line breaks are interpreted as content");
}
state.documents.push(state.result);
if (state.position === state.lineStart && testDocumentSeparator(state)) {
if (state.input.charCodeAt(state.position) === 0x2e /* . */) {
state.position += 3;
skipSeparationSpace(state, true, -1);
}
return;
}
if (state.position < state.length - 1) {
return throwError(
state,
"end of the stream or a document separator is expected"
);
} else {
return;
}
}
function loadDocuments(input: string, options?: LoaderStateOptions): unknown[] {
input = String(input);
options = options || {};
if (input.length !== 0) {
// Add tailing `\n` if not exists
if (
input.charCodeAt(input.length - 1) !== 0x0a /* LF */ &&
input.charCodeAt(input.length - 1) !== 0x0d /* CR */
) {
input += "\n";
}
// Strip BOM
if (input.charCodeAt(0) === 0xfeff) {
input = input.slice(1);
}
}
const state = new LoaderState(input, options);
// Use 0 as string terminator. That significantly simplifies bounds check.
state.input += "\0";
while (state.input.charCodeAt(state.position) === 0x20 /* Space */) {
state.lineIndent += 1;
state.position += 1;
}
while (state.position < state.length - 1) {
readDocument(state);
}
return state.documents;
}
export type CbFunction = (doc: unknown) => void;
function isCbFunction(fn: unknown): fn is CbFunction {
return typeof fn === "function";
}
export function loadAll<T extends CbFunction | LoaderStateOptions>(
input: string,
iteratorOrOption?: T,
options?: LoaderStateOptions
): T extends CbFunction ? void : unknown[] {
if (!isCbFunction(iteratorOrOption)) {
return loadDocuments(input, iteratorOrOption as LoaderStateOptions) as Any;
}
const documents = loadDocuments(input, options);
const iterator = iteratorOrOption;
for (let index = 0, length = documents.length; index < length; index++) {
iterator(documents[index]);
}
return void 0 as Any;
}
export function load(input: string, options?: LoaderStateOptions): unknown {
const documents = loadDocuments(input, options);
if (documents.length === 0) {
return;
}
if (documents.length === 1) {
return documents[0];
}
throw new YAMLError(
"expected a single document in the stream, but found more"
);
}