112 lines
3.3 KiB
TypeScript
112 lines
3.3 KiB
TypeScript
import { readdirSync, statSync, readFileSync } from "node:fs"
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import { join } from "node:path"
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import { TextDecoder } from "node:util"
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export type TemplateVariable = {
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path: string
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type: string
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}
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const IF_RE = /<@(?:if|elseif)\((.+?)\)>/g
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const VAR_RE = /<@var\(context\.(.+?)(?::(\w+))?\)>/g
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const DIRECTIVE_RE = /<@(if|elseif|else|endif)(?:\((.+?)\))?>/g
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const EQ_RE = /^eq\(context\.(.+?),\s*"(.*)"\)$/
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const PATH_RE = /^context\.(.+)$/
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function extractCondition(expr: string | undefined, vars: TemplateVariable[]) {
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if (!expr) throw new Error("Missing condition expression")
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const eqMatch = expr.match(EQ_RE)
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if (eqMatch) {
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vars.push({ path: eqMatch[1]!, type: "string" })
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return
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}
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const pathMatch = expr.match(PATH_RE)
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if (pathMatch) {
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vars.push({ path: pathMatch[1]!, type: "boolean" })
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return
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}
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throw new Error(`Invalid condition expression: ${expr}`)
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}
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function extractFromString(text: string, vars: TemplateVariable[]) {
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for (const match of text.matchAll(IF_RE)) {
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extractCondition(match[1]!, vars)
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}
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for (const match of text.matchAll(VAR_RE)) {
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vars.push({ path: match[1]!, type: match[2] ?? "string" })
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}
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}
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function validateIfBlocks(content: string, vars: TemplateVariable[]) {
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const stack: { sawElse: boolean }[] = []
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for (const match of content.matchAll(DIRECTIVE_RE)) {
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const directive = match[1]!
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const condition = match[2]
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if (directive === "if") {
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extractCondition(condition!, vars)
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stack.push({ sawElse: false })
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} else if (directive === "elseif") {
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const frame = stack[stack.length - 1]
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if (!frame) throw new Error("Unexpected <@elseif> without <@if>")
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if (frame.sawElse) throw new Error("Unexpected <@elseif> after <@else>")
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extractCondition(condition!, vars)
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} else if (directive === "else") {
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const frame = stack[stack.length - 1]
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if (!frame) throw new Error("Unexpected <@else> without <@if>")
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if (frame.sawElse) throw new Error("Unexpected duplicate <@else>")
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frame.sawElse = true
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} else if (directive === "endif") {
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if (stack.length === 0) throw new Error("Unexpected <@endif> without <@if>")
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stack.pop()
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}
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}
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if (stack.length > 0) {
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throw new Error("Unmatched <@if> without <@endif>")
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}
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}
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function isUtf8Text(buffer: Buffer): boolean {
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if (buffer.indexOf(0) !== -1) return false
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try {
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new TextDecoder("utf-8", { fatal: true }).decode(buffer)
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return true
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} catch {
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return false
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}
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}
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function walkDir(dirPath: string, vars: TemplateVariable[]) {
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const entries = readdirSync(dirPath).sort()
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for (const entry of entries) {
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const fullPath = join(dirPath, entry)
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extractFromString(entry, vars)
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const stat = statSync(fullPath)
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if (stat.isDirectory()) {
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walkDir(fullPath, vars)
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} else if (stat.isFile()) {
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const content = readFileSync(fullPath)
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if (isUtf8Text(content)) {
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const text = content.toString("utf-8")
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extractFromString(text, vars)
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validateIfBlocks(text, vars)
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}
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}
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}
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}
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export function parse(dirPath: string): TemplateVariable[] {
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const vars: TemplateVariable[] = []
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walkDir(dirPath, vars)
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const seen = new Set<string>()
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return vars.filter(v => {
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const key = `${v.path}:${v.type}`
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if (seen.has(key)) return false
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seen.add(key)
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return true
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})
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}
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