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refactor: add parse modes type hints, minor refactoring #15

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refactor: add parse modes type hints, minor refactoring #15

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aa94155
refactor: add parse modes type hints, minor refactoring
evermake Feb 4, 2023
06b35d0
refactor: simplify code, get rid of parse mode maps
evermake Feb 4, 2023
8734533
chore: fix type in JSDoc, remove multiline string
evermake Feb 4, 2023
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46 changes: 15 additions & 31 deletions src/transformer.ts
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Original file line number Diff line number Diff line change
@@ -1,27 +1,13 @@
import type { Transformer } from "./deps.deno.ts";

const wellKnownParseModesMap = new Map([
["html", "HTML"],
["markdown", "Markdown"],
["markdownv2", "MarkdownV2"],
]);
import type { ParseMode, Transformer } from "./deps.deno.ts";

/**
* Creates a new transformer for the given parse mode.
* @param parseMode {string} The parse mode to use. If the parse mode is not in the well known parse modes map, it will be used as is.
* @see https://core.telegram.org/bots/api#formatting-options for well known parse modes.
* @param parseMode {ParseMode} The parse mode to use.
* @see https://core.telegram.org/bots/api#formatting-options for more information about formatting.
* @returns {Transformer} The transformer.
*/
const buildTransformer = (parseMode: string) => {
const normalisedParseMode =
wellKnownParseModesMap.get(parseMode.toLowerCase()) ?? parseMode;
if (!wellKnownParseModesMap.has(parseMode.toLowerCase())) {
console.warn(
`Could not find parse_mode: ${parseMode}. If this is a valid parse_mode, you should ignore this message.`,
);
}

const transformer: Transformer = (prev, method, payload, signal) => {
const buildTransformer = (parseMode: ParseMode): Transformer => (
(prev, method, payload, signal) => {
if (!payload || "parse_mode" in payload) {
return prev(method, payload, signal);
}
Expand All @@ -32,37 +18,35 @@ const buildTransformer = (parseMode: string) => {
"media" in payload &&
!("parse_mode" in payload.media)
) {
payload.media.parse_mode = normalisedParseMode;
payload.media.parse_mode = parseMode;
}
break;
break;

case "answerInlineQuery":
if ("results" in payload) {
for (let result of payload.results) {
for (const result of payload.results) {
if (
"input_message_content" in result &&
!("parse_mode" in result.input_message_content)
) {
result.input_message_content.parse_mode = normalisedParseMode;
}
else if (!("parse_mode" in result)) {
result.parse_mode = normalisedParseMode;
result.input_message_content.parse_mode = parseMode;
} else if (!("parse_mode" in result)) {
result.parse_mode = parseMode;
}
}
}
break;
break;

default:
payload = { ...payload, ...{ parse_mode: normalisedParseMode } };
payload = { ...payload, ...{ parse_mode: parseMode } };
}

return prev(
method,
payload,
signal,
);
};
return transformer;
};
}
);

export { buildTransformer as parseMode };