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Extract MFM normalize function

This commit is contained in:
Aya Morisawa 2019-01-30 13:47:58 +09:00
parent 5bbf4187e6
commit 6eb9ba31bf
2 changed files with 34 additions and 28 deletions
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31
src/mfm/normalize.ts Normal file
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@ -0,0 +1,31 @@
import * as A from '../prelude/array';
import * as S from '../prelude/string';
import { MfmForest, MfmTree } from './parser';
import { createTree, createLeaf } from '../prelude/tree';
function isEmptyTextTree(t: MfmTree): boolean {
return t.node.type == 'text' && t.node.props.text === '';
}
function concatTextTrees(ts: MfmForest): MfmTree {
return createLeaf({ type: 'text', props: { text: S.concat(ts.map(x => x.node.props.text)) } });
}
function concatIfTextTrees(ts: MfmForest): MfmForest {
return ts[0].node.type === 'text' ? [concatTextTrees(ts)] : ts;
}
function concatConsecutiveTextTrees(ts: MfmForest): MfmForest {
const us = A.concat(A.groupOn(t => t.node.type, ts).map(concatIfTextTrees));
return us.map(t => createTree(t.node, concatConsecutiveTextTrees(t.children)));
}
function removeEmptyTextNodes(ts: MfmForest): MfmForest {
return ts
.filter(t => !isEmptyTextTree(t))
.map(t => createTree(t.node, removeEmptyTextNodes(t.children)));
}
export function normalize(ts: MfmForest): MfmForest {
return removeEmptyTextNodes(concatConsecutiveTextTrees(ts));
}

31
src/mfm/parse.ts
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@ -1,30 +1,5 @@
import parser, { plainParser, MfmForest, MfmTree } from './parser'; import parser, { plainParser, MfmForest } from './parser';
import * as A from '../prelude/array'; import { normalize } from './normalize';
import * as S from '../prelude/string';
import { createTree, createLeaf } from '../prelude/tree';
function concatTextTrees(ts: MfmForest): MfmTree {
return createLeaf({ type: 'text', props: { text: S.concat(ts.map(x => x.node.props.text)) } });
}
function concatIfTextTrees(ts: MfmForest): MfmForest {
return ts[0].node.type === 'text' ? [concatTextTrees(ts)] : ts;
}
function concatConsecutiveTextTrees(ts: MfmForest): MfmForest {
const us = A.concat(A.groupOn(t => t.node.type, ts).map(concatIfTextTrees));
return us.map(t => createTree(t.node, concatConsecutiveTextTrees(t.children)));
}
function isEmptyTextTree(t: MfmTree): boolean {
return t.node.type == 'text' && t.node.props.text === '';
}
function removeEmptyTextNodes(ts: MfmForest): MfmForest {
return ts
.filter(t => !isEmptyTextTree(t))
.map(t => createTree(t.node, removeEmptyTextNodes(t.children)));
}
export default (source: string, plainText = false): MfmForest => { export default (source: string, plainText = false): MfmForest => {
if (source == null || source == '') { if (source == null || source == '') {
@ -32,5 +7,5 @@ export default (source: string, plainText = false): MfmForest => {
} }
const raw = plainText ? plainParser.root.tryParse(source) : parser.root.tryParse(source) as MfmForest; const raw = plainText ? plainParser.root.tryParse(source) : parser.root.tryParse(source) as MfmForest;
return removeEmptyTextNodes(concatConsecutiveTextTrees(raw)); return normalize(raw);
}; };