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otexplorer

otexplorer is a Rust binary for printing and querying the contents of font files.

It is loosely modeled off of the ttx tool, although it uses a custom text format instead of xml. In addition, it supports a query syntax, allowing printing of a specific subtable or record.

query syntax

the -q flag can be passed at the command line to specify a query string, which represents a path within a font table.

Queries start with an OpenType tag indicating the root table, and then zero or more dot-separated path elements; these can be either the names of fields, or if a field is an array, an index into a field.

For example, to print the first subtable of the second GPOS lookup, you could use the query,

-q GPOS.lookup_list.lookup_offsets.1.subtable_offsets.0

Queries are case-insensitive, and are fuzzily matched. The following queries are equivalent:

-q GPOS.lookupListOffset.lookupOffsets.1.subtableOffsets.0
-q GPOS.look.off.1.off.0