128 lines
2.8 KiB
JavaScript
128 lines
2.8 KiB
JavaScript
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export class TextPostProcessRuler {
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constructor() {
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this.rules = [];
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}
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getRules() {
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return this.rules;
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}
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// TODO error handling
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getMatcher() {
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if (this.matcher) { return this.matcher; }
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this.matcherIndex = [];
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let rules = this.rules.map((r) =>
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"(" + r.rule.matcher.toString().slice(1,-1) + ")"
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);
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let i;
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let regexString = "";
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let last = 1;
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// this code is a bit tricky, our matcher may have multiple capture groups
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// we want to dynamically determine how many
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for(i=0; i<rules.length; i++) {
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this.matcherIndex[i] = last;
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if (i === rules.length-1) {
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break;
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}
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if (i>0) {
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regexString = regexString + '|';
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}
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regexString = regexString + rules[i];
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let regex = new RegExp(regexString + '|(x)');
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last = 'x'.match(regex).length - 1;
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}
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this.matcher = new RegExp(rules.join('|'), 'g');
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return this.matcher;
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}
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applyRule(buffer, match, state) {
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let i;
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for(i=0; i<this.rules.length; i++) {
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let index = this.matcherIndex[i];
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if (match[index]) {
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this.rules[i].rule.onMatch(buffer, match.slice(index, this.matcherIndex[i+1]), state);
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break;
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}
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}
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}
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// TODO validate inputs
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push(name, rule) {
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this.rules.push({name, rule});
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this.matcher = null;
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}
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}
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function allowedBoundary(content, index, utils) {
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let code = content.charCodeAt(index);
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return (utils.isWhiteSpace(code) || utils.isPunctChar(String.fromCharCode(code)));
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}
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function textPostProcess(content, state, ruler) {
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let result = null,
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match,
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pos = 0;
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const matcher = ruler.getMatcher();
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while (match = matcher.exec(content)) {
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// check boundary
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if (match.index > 0) {
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if (!allowedBoundary(content, match.index-1, state.md.utils)) {
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continue;
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}
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}
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// check forward boundary as well
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if (match.index + match[0].length < content.length) {
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if (!allowedBoundary(content, match.index + match[0].length, state.md.utils)) {
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continue;
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}
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}
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if (match.index > pos) {
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result = result || [];
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let token = new state.Token('text', '', 0);
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token.content = content.slice(pos, match.index);
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result.push(token);
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}
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result = result || [];
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ruler.applyRule(result, match, state);
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pos = match.index + match[0].length;
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}
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if (result && pos < content.length) {
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let token = new state.Token('text', '', 0);
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token.content = content.slice(pos);
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result.push(token);
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}
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return result;
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}
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export function setup(helper) {
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helper.registerPlugin(md => {
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const ruler = md.core.textPostProcess.ruler;
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const replacer = (content, state) => textPostProcess(content, state, ruler);
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md.core.ruler.push('text-post-process', state =>
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md.options.discourse.helpers.textReplace(state, replacer, true)
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);
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});
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}
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