Documentation
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Overview ¶
Package exprlang compiles condition expressions for workflow DAG validation. It builds a typed environment from a JSON Schema (the predecessor node's outputSchema), then uses expr-lang to compile the expression — catching missing fields, wrong types, and syntax errors at validate time rather than at runtime.
SECURITY: SchemaToEnv and CompileCondition must not panic on adversarial or malformed input. JSON Schemas are user-authored (workflow definitions); duplicate field names after CamelCase conversion, invalid Go identifiers, and other edge cases are caught and returned as errors before reaching reflect.StructOf.
Index ¶
Constants ¶
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Variables ¶
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Functions ¶
func CompileCondition ¶
CompileCondition compiles a single condition expression against the JSON-Schema-derived environment. Returns nil on success; on failure, returns an error detailing the type mismatch, missing field, or syntax error. Expressions reference fields via input.FieldName (CamelCase).
func SchemaToEnv ¶
SchemaToEnv converts a JSON Schema (the predecessor node's outputSchema) into an expr-lang environment: a map with an "input" key whose value is a pointer to a reflect.StructOf-generated struct. The struct's fields are CamelCase versions of the JSON Schema's property names (snake_case, kebab-case, etc. all become CamelCase), with Go types derived from the schema's "type" keyword.
The returned environment type-checks strictly: missing fields and wrong types in expressions produce compile errors. A nil/empty schema produces a map[string]any environment (no type-checking); callers requiring strict checking should reject empty schemas upstream.
Types ¶
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Source Files