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cache + TOKEN_REGEX

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This commit is contained in:
benceruleanlu
2025-04-30 16:06:28 -04:00
parent 9e43303846
commit 9673560ced
1 changed files with 16 additions and 4 deletions
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20
src/utils/expressionParserUtil.ts
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@@ -30,6 +30,12 @@ const OP_PRECEDENCE: Record<string, number> = {
'!=': 3 '!=': 3
} }
// hoist and reuse the regex, avoid re‑allocating literal each call
const TOKEN_REGEX =
/\s*("(?:\\.|[^"\\])*"|'(?:\\.|[^'\\])*'|==|!=|&&|\|\||[A-Za-z0-9_.]+|!|\(|\))\s*/g
// cache parsed ASTs per expression
const astCache = new Map<string, ASTNode>()
/** /**
* Tokenizes a context key expression string. * Tokenizes a context key expression string.
* @param expr The expression string (e.g., "key1 && !key2 || (key3 && key4)"). * @param expr The expression string (e.g., "key1 && !key2 || (key3 && key4)").
@@ -39,8 +45,8 @@ const OP_PRECEDENCE: Record<string, number> = {
export function tokenize(expr: string): Token[] { export function tokenize(expr: string): Token[] {
const tokens: Token[] = [] const tokens: Token[] = []
let pos = 0 let pos = 0
const re = // clone/reset regex state
/\s*("(?:\\.|[^"\\])*"|'(?:\\.|[^'\\])*'|==|!=|&&|\|\||[A-Za-z0-9_.]+|!|\(|\))\s*/g const re = new RegExp(TOKEN_REGEX)
let m: RegExpExecArray | null let m: RegExpExecArray | null
while ((m = re.exec(expr))) { while ((m = re.exec(expr))) {
if (m.index !== pos) { if (m.index !== pos) {
@@ -208,8 +214,14 @@ export function evaluateExpression(
if (!expr) return true if (!expr) return true
try { try {
const tokens = tokenize(expr) let ast: ASTNode
const ast = parseAST(tokens) if (astCache.has(expr)) {
ast = astCache.get(expr)!
} else {
const tokens = tokenize(expr)
ast = parseAST(tokens)
astCache.set(expr, ast)
}
return evalAst(ast, getContextKey) return evalAst(ast, getContextKey)
} catch (error) { } catch (error) {
console.error(`Error evaluating expression "${expr}":`, error) console.error(`Error evaluating expression "${expr}":`, error)