Spel parsers.
val desugar : Spel_t.expression ‑> Spel_t.expressiondesugar expr expands shorthand syntax for variables, entities
and intents into their underlying Spel expressions.
val resugar : Spel_t.expression ‑> Spel_t.expressiondesugar expr re-introduces shorthand syntax for variables,
entities and intents.
val expr_from_string : string ‑> Spel_t.expressionexpr_from_string s parses string s as spel expression
val quoted_expr_from_file : string ‑> Spel_t.expressionquoted_expr_from_file f parses file f as text containing
quoted spel expressions
val quoted_expr_from_string : string ‑> Spel_t.expressionquoted_expr_from_string f parses string s as text containing
quoted spel expression