Module header 

Shared, quote-aware ISO 10303-21 header record and schema reading. The export writer and analytic processing use the same lexical rules.

Structs

Lex

A monotonically advancing scan of one byte buffer.

Constants

MAX_HEADER_BYTES

The bounded source-header reader’s maximum scan window.

Functions

declared_schema

Read the first declared schema identifier from the complete header.

declared_schema_bounded

Read the first declared schema identifier from a bounded header window.

declared_schemas

Read all declared schema identifiers from the complete header.

declared_schemas_bounded

Read schema identifiers from a bounded header window.

decode_opt_string

Decode one argument to a string, or None for $ (unset), * (derived) or empty.

decode_opt_string_list

decode_string_list, but an unset ($, *) or missing argument is None rather than an empty list, so a writer can tell “never stated” from a literal () (#5470).

decode_string_list

Decode a list argument (('a','b',...)). $/empty yield an empty list, and unset entries are dropped. A bare single value where a list was expected is tolerated, as on the TS side.

extract_record_args

Extract the argument substring inside the parentheses of KEYWORD( ... ). Quote- and nesting-aware, so a quoted ) never closes the record early.

find_record_open

Find the opening parenthesis of an exact record keyword outside literals/comments, ignoring ASCII case.

find_section_marker

Locate an exact section marker such as ENDSEC; or DATA;.

split_top_level

Split STEP record arguments at top-level commas, respecting paren/bracket nesting and single-quoted strings (with '' escapes). Returns the raw, still-escaped argument substrings, trimmed.