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import type { AttrList } from './attr-list';
import type { ParsedMultivariantPlaylist } from '../loader/m3u8-parser';
import type { LevelDetails } from '../loader/level-details';
import type { VariableMap } from '../types/level';
const VARIABLE_REPLACEMENT_REGEX = /\{\$([a-zA-Z0-9-_]+)\}/g;
export function hasVariableReferences(str: string): boolean {
return VARIABLE_REPLACEMENT_REGEX.test(str);
}
export function substituteVariablesInAttributes(
parsed: Pick<
ParsedMultivariantPlaylist | LevelDetails,
'variableList' | 'hasVariableRefs' | 'playlistParsingError'
>,
attr: AttrList,
attributeNames: string[]
) {
if (parsed.variableList !== null || parsed.hasVariableRefs) {
for (let i = attributeNames.length; i--; ) {
const name = attributeNames[i];
const value = attr[name];
if (value) {
attr[name] = substituteVariables(parsed, value);
}
}
}
}
export function substituteVariables(
parsed: Pick<
ParsedMultivariantPlaylist | LevelDetails,
'variableList' | 'hasVariableRefs' | 'playlistParsingError'
>,
value: string
): string {
if (parsed.variableList !== null || parsed.hasVariableRefs) {
const variableList = parsed.variableList;
return value.replace(
VARIABLE_REPLACEMENT_REGEX,
(variableReference: string) => {
const variableName = variableReference.substring(
2,
variableReference.length - 1
);
const variableValue = variableList?.[variableName];
if (variableValue === undefined) {
parsed.playlistParsingError ||= new Error(
`Missing preceding EXT-X-DEFINE tag for Variable Reference: "${variableName}"`
);
return variableReference;
}
return variableValue;
}
);
}
return value;
}
export function addVariableDefinition(
parsed: Pick<
ParsedMultivariantPlaylist | LevelDetails,
'variableList' | 'playlistParsingError'
>,
attr: AttrList,
parentUrl: string
) {
let variableList = parsed.variableList;
if (!variableList) {
parsed.variableList = variableList = {};
}
let NAME: string;
let VALUE;
if ('QUERYPARAM' in attr) {
NAME = attr.QUERYPARAM;
try {
const searchParams = new self.URL(parentUrl).searchParams;
if (searchParams.has(NAME)) {
VALUE = searchParams.get(NAME);
} else {
throw new Error(
`"${NAME}" does not match any query parameter in URI: "${parentUrl}"`
);
}
} catch (error) {
parsed.playlistParsingError ||= new Error(
`EXT-X-DEFINE QUERYPARAM: ${error.message}`
);
}
} else {
NAME = attr.NAME;
VALUE = attr.VALUE;
}
if (NAME in variableList) {
parsed.playlistParsingError ||= new Error(
`EXT-X-DEFINE duplicate Variable Name declarations: "${NAME}"`
);
} else {
variableList[NAME] = VALUE || '';
}
}
export function importVariableDefinition(
parsed: Pick<
ParsedMultivariantPlaylist | LevelDetails,
'variableList' | 'playlistParsingError'
>,
attr: AttrList,
sourceVariableList: VariableMap | null
) {
const IMPORT = attr.IMPORT;
if (sourceVariableList && IMPORT in sourceVariableList) {
let variableList = parsed.variableList;
if (!variableList) {
parsed.variableList = variableList = {};
}
variableList[IMPORT] = sourceVariableList[IMPORT];
} else {
parsed.playlistParsingError ||= new Error(
`EXT-X-DEFINE IMPORT attribute not found in Multivariant Playlist: "${IMPORT}"`
);
}
}