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import { Type } from 'main.core';
import { getByIndex } from '../../shared';
import {
BBCodeScheme,
DefaultBBCodeScheme,
BBCodeNode,
typeof BBCodeRootNode,
typeof BBCodeElementNode,
typeof BBCodeTextNode,
typeof BBCodeTagScheme,
type BBCodeContentNode,
type BBCodeSpecialCharNode,
} from 'ui.bbcode.model';
import { BBCodeEncoder } from 'ui.bbcode.encoder';
import { ParserScheme } from './parser-scheme';
const TAG_REGEX: RegExp = /\[(\/)?(\w+|\*)(.*?)]/gs;
const isSpecialChar = (symbol: string): boolean => {
return ['\n', '\t'].includes(symbol);
};
const isList = (tagName: string): boolean => {
return ['list', 'ul', 'ol'].includes(String(tagName).toLowerCase());
};
const isListItem = (tagName: string): boolean => {
return ['*', 'li'].includes(String(tagName).toLowerCase());
};
const parserScheme = new ParserScheme();
type BBCodeParserOptions = {
scheme?: BBCodeScheme,
onUnknown?: (node: BBCodeContentNode, scheme: BBCodeScheme) => void,
encoder?: BBCodeEncoder,
};
class BBCodeParser
{
scheme: BBCodeScheme;
encoder: BBCodeEncoder;
onUnknownHandler: () => any;
constructor(options: BBCodeParserOptions = {})
{
if (options.scheme)
{
this.setScheme(options.scheme);
}
else
{
this.setScheme(new DefaultBBCodeScheme());
}
if (Type.isFunction(options.onUnknown))
{
this.setOnUnknown(options.onUnknown);
}
else
{
this.setOnUnknown(BBCodeParser.defaultOnUnknownHandler);
}
if (options.encoder instanceof BBCodeEncoder)
{
this.setEncoder(options.encoder);
}
else
{
this.setEncoder(new BBCodeEncoder());
}
}
setScheme(scheme: BBCodeScheme)
{
this.scheme = scheme;
}
getScheme(): BBCodeScheme
{
return this.scheme;
}
setOnUnknown(handler: () => any)
{
if (!Type.isFunction(handler))
{
throw new TypeError('handler is not a function');
}
this.onUnknownHandler = handler;
}
getOnUnknownHandler(): () => any
{
return this.onUnknownHandler;
}
setEncoder(encoder: BBCodeEncoder)
{
if (encoder instanceof BBCodeEncoder)
{
this.encoder = encoder;
}
else
{
throw new TypeError('encoder is not BBCodeEncoder instance');
}
}
getEncoder(): BBCodeEncoder
{
return this.encoder;
}
static defaultOnUnknownHandler(node: BBCodeContentNode, scheme: BBCodeScheme): ?Array<BBCodeContentNode>
{
if (node.getType() === BBCodeNode.ELEMENT_NODE)
{
const nodeName: string = node.getName();
if (['left', 'center', 'right', 'justify'].includes(nodeName))
{
node.replace(
scheme.createElement({
name: 'p',
children: node.getChildren(),
}),
);
}
else if (['background', 'color', 'size'].includes(nodeName))
{
node.replace(
scheme.createElement({
name: 'b',
children: node.getChildren(),
}),
);
}
else
{
const openingTag: string = node.getOpeningTag();
const closingTag: string = node.getClosingTag();
node.replace(
scheme.createText(openingTag),
...node.getChildren(),
scheme.createText(closingTag),
);
}
}
}
static toLowerCase(value: string): string
{
if (Type.isStringFilled(value))
{
return value.toLowerCase();
}
return value;
}
parseText(text: string): Array<BBCodeTextNode | BBCodeSpecialCharNode>
{
if (Type.isStringFilled(text))
{
return [...text]
.reduce((acc: Array<BBCodeTextNode | BBCodeSpecialCharNode>, symbol: string) => {
if (isSpecialChar(symbol))
{
acc.push(symbol);
}
else
{
const lastItem: string = getByIndex(acc, -1);
if (isSpecialChar(lastItem) || Type.isNil(lastItem))
{
acc.push(symbol);
}
else
{
acc[acc.length - 1] += symbol;
}
}
return acc;
}, [])
.map((fragment: string) => {
if (fragment === '\n')
{
return parserScheme.createNewLine();
}
if (fragment === '\t')
{
return parserScheme.createTab();
}
return parserScheme.createText({
content: this.getEncoder().decodeText(fragment),
});
});
}
return [];
}
static findNextTagIndex(bbcode: string, startIndex = 0): number
{
const nextContent: string = bbcode.slice(startIndex);
const [nextTag: ?string] = nextContent.match(new RegExp(TAG_REGEX)) || [];
if (nextTag)
{
return bbcode.indexOf(nextTag, startIndex);
}
return -1;
}
static trimQuotes(value: string): string
{
const source = String(value);
if ((/^["'].*["']$/g).test(source))
{
return source.slice(1, -1);
}
return value;
}
parseAttributes(sourceAttributes: string): { value: ?string, attributes: Array<[string, string]> }
{
const result: {value: string, attributes: Array<Array<string, string>>} = { value: '', attributes: [] };
if (Type.isStringFilled(sourceAttributes))
{
if (sourceAttributes.startsWith('='))
{
result.value = this.getEncoder().decodeAttribute(
BBCodeParser.trimQuotes(
sourceAttributes.slice(1),
),
);
return result;
}
return sourceAttributes
.trim()
.split(' ')
.filter(Boolean)
.reduce((acc: typeof result, item: string) => {
const [key: string, value: string = ''] = item.split('=');
acc.attributes.push([
BBCodeParser.toLowerCase(key),
this.getEncoder().decodeAttribute(
BBCodeParser.trimQuotes(value),
),
]);
return acc;
}, result);
}
return result;
}
parse(bbcode: string): BBCodeRootNode
{
const result: BBCodeRootNode = parserScheme.createRoot();
const firstTagIndex: number = BBCodeParser.findNextTagIndex(bbcode);
if (firstTagIndex !== 0)
{
const textBeforeFirstTag: string = firstTagIndex === -1 ? bbcode : bbcode.slice(0, firstTagIndex);
result.appendChild(
...this.parseText(textBeforeFirstTag),
);
}
const stack: Array<BBCodeElementNode> = [result];
const wasOpened: Array<string> = [];
let current: ?BBCodeElementNode = null;
let level: number = 0;
bbcode.replace(TAG_REGEX, (fullTag: string, slash: ?string, tagName: string, attrs: ?string, index: number) => {
const isOpeningTag: boolean = Boolean(slash) === false;
const startIndex: number = fullTag.length + index;
const nextContent: string = bbcode.slice(startIndex);
const attributes = this.parseAttributes(attrs);
const lowerCaseTagName: string = BBCodeParser.toLowerCase(tagName);
let parent: ?(BBCodeRootNode | BBCodeElementNode) = stack[level];
if (isOpeningTag)
{
const isPotentiallyVoid: boolean = !nextContent.includes(`[/${tagName}]`);
if (
isPotentiallyVoid
&& !isListItem(lowerCaseTagName)
)
{
const tagScheme: BBCodeTagScheme = this.getScheme().getTagScheme(lowerCaseTagName);
const isAllowedVoidTag: boolean = tagScheme && tagScheme.isVoid();
if (isAllowedVoidTag)
{
current = parserScheme.createElement({
name: lowerCaseTagName,
value: attributes.value,
attributes: Object.fromEntries(attributes.attributes),
});
current.setScheme(this.getScheme());
parent.appendChild(current);
}
else
{
parent.appendChild(
parserScheme.createText(fullTag),
);
}
const nextTagIndex: number = BBCodeParser.findNextTagIndex(bbcode, startIndex);
if (nextTagIndex !== 0)
{
const content: string = nextTagIndex === -1 ? nextContent : bbcode.slice(startIndex, nextTagIndex);
parent.appendChild(
...this.parseText(content),
);
}
}
else
{
if (isListItem(lowerCaseTagName) && current && isListItem(current.getName()))
{
level--;
parent = stack[level];
}
current = parserScheme.createElement({
name: lowerCaseTagName,
value: attributes.value,
attributes: Object.fromEntries(attributes.attributes),
});
const nextTagIndex: number = BBCodeParser.findNextTagIndex(bbcode, startIndex);
if (nextTagIndex !== 0)
{
const content: string = nextTagIndex === -1 ? nextContent : bbcode.slice(startIndex, nextTagIndex);
current.appendChild(
...this.parseText(content),
);
}
parent.appendChild(current);
level++;
stack[level] = current;
wasOpened.push(lowerCaseTagName);
}
}
else
{
if (wasOpened.includes(lowerCaseTagName))
{
level--;
const openedTagIndex: number = wasOpened.indexOf(lowerCaseTagName);
wasOpened.splice(openedTagIndex, 1);
}
else
{
stack[level].appendChild(
parserScheme.createText(fullTag),
);
}
if (isList(lowerCaseTagName) && level > 0)
{
level--;
}
const nextTagIndex: number = BBCodeParser.findNextTagIndex(bbcode, startIndex);
if (nextTagIndex !== 0 && stack[level])
{
const content: string = nextTagIndex === -1 ? nextContent : bbcode.slice(startIndex, nextTagIndex);
stack[level].appendChild(
...this.parseText(content),
);
}
if (isListItem(stack[level].getName()) && level > 0)
{
level--;
}
}
});
const getFinalLineBreaksIndexes = (node: BBCodeContentNode) => {
let skip = false;
return node
.getChildren()
.reduceRight((acc: Array<BBCodeContentNode>, child: BBCodeContentNode, index: number) => {
if (!skip && child.getName() === '#linebreak')
{
acc.push(index);
}
else if (!skip && child.getName() !== '#tab')
{
skip = true;
}
return acc;
}, []);
};
BBCodeNode.flattenAst(result).forEach((node: BBCodeContentNode) => {
if (node.getName() === '*')
{
const finalLinebreaksIndexes: Array<number> = getFinalLineBreaksIndexes(node);
if (finalLinebreaksIndexes.length === 1)
{
node.setChildren(
node.getChildren().slice(0, getByIndex(finalLinebreaksIndexes, 0)),
);
}
if (finalLinebreaksIndexes.length > 1 && (finalLinebreaksIndexes & 2) === 0)
{
node.setChildren(
node.getChildren().slice(0, getByIndex(finalLinebreaksIndexes, 0)),
);
}
}
});
result.setScheme(
this.getScheme(),
this.getOnUnknownHandler(),
);
return result;
}
}
export {
BBCodeParser,
};