huncholaneA better version of regex 101
| 1 | export const readVars = (str) => { |
| 2 | let lines = str.split("\n"); |
| 3 | const vars = {}; |
| 4 | for (let i = 0; i < lines.length; i++) { |
| 5 | let line = lines[i]; |
| 6 | let lineSplit = line.split(":=="); |
| 7 | if ((lineSplit.length = 2)) { |
| 8 | let [name, val] = lineSplit; |
| 9 | vars[name] = val; |
| 10 | } |
| 11 | } |
| 12 | return vars; |
| 13 | }; |
| 14 | |
| 15 | const parseBuilder = (str, vars) => { |
| 16 | let lines = str.split("\n"); |
| 17 | const ref = {}; |
| 18 | for (let line of lines) { |
| 19 | if (!line.trim()) continue; |
| 20 | const r = |
| 21 | /^(?<tabs>\s*)(?<name>\w*)(?<optional>[\*\+\?]*)(?<type>[:>])(?<regex>.*)/.exec( |
| 22 | line |
| 23 | ); |
| 24 | if (!r) return ""; |
| 25 | const lineData = r.groups; |
| 26 | const tabs = lineData.tabs.length; |
| 27 | if (!ref[tabs]) ref[tabs] = [lineData]; |
| 28 | else ref[tabs].push(lineData); |
| 29 | if (tabs) { |
| 30 | const parentRefInd = ref[tabs - 1].length - 1; |
| 31 | let parent = ref[tabs - 1][parentRefInd]; |
| 32 | if (!parent.children) parent.children = [lineData]; |
| 33 | else parent.children.push(lineData); |
| 34 | } |
| 35 | } |
| 36 | return buildToRegex(ref[0], vars); |
| 37 | }; |
| 38 | |
| 39 | const buildToRegex = (build, vars) => { |
| 40 | const re = buildToRegexRecursion(build, "", vars); |
| 41 | return re; |
| 42 | }; |
| 43 | |
| 44 | const buildToRegexRecursion = (build, re, vars) => { |
| 45 | if (!build?.length) return re; |
| 46 | const val = build.shift(); |
| 47 | console.log(vars); |
| 48 | if (vars && Object.keys(vars).includes(val.regex)) |
| 49 | val.regex = vars[val.regex]; |
| 50 | if (val.type === ":") { |
| 51 | if (val.name) re += `(?P<${val.name}>${val.regex}`; |
| 52 | else re += `(?:${val.regex}`; |
| 53 | if (val.children) re += buildToRegexRecursion(val.children, "", vars); |
| 54 | re += `)${val.optional}`; |
| 55 | } else if (val.type === ">") { |
| 56 | re += val.regex; |
| 57 | if (val.children) re += buildToRegexRecursion(val.children, "", vars); |
| 58 | } |
| 59 | |
| 60 | return buildToRegexRecursion(build, re, vars); |
| 61 | }; |
| 62 | |
| 63 | export default parseBuilder; |