tree-sitter-language-pack-extracting-code-structure

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Extracting code structure

ts-pack process <file> runs the code-intelligence pipeline over a source file and prints JSON. Use it when the user wants structured metadata — "list the functions", "what does this file import", "find the exported symbols", "pull the docstrings" — rather than a raw syntax tree.

Quick recipe

# Default features: structure + imports + exports
ts-pack process src/app.ts

# Pick features explicitly (only what you ask for is computed)
ts-pack process src/app.ts --structure --imports --symbols --docstrings

# Everything
ts-pack process src/app.ts --all

When no feature flags are given, process defaults to --structure --imports --exports. Passing any single extraction flag (--structure --imports --exports --comments --docstrings --symbols --diagnostics) turns off that default set, so list every feature you want. --chunk-size and --language are modifiers, not extraction flags: they do not disable the defaults (e.g. --chunk-size 500 alone still emits structure+imports+exports and adds chunks).

Feature flags

Flag	Extracts
--structure	Functions, classes, methods, modules (spans, nesting, visibility).
--imports	Import statements and their sources.
--exports	Exported symbols and their kinds.
--comments	Inline and block comments.
--docstrings	Docstrings attached to definitions.
--symbols	All identifiers (for search/indexing).
--diagnostics	Syntax errors and error nodes with positions.
--all	Enable every feature above.
--chunk-size <bytes>	Syntax-aware chunks — see tree-sitter-language-pack-chunking-for-llms.
--language <name> (-l)	Override language (auto-detected from extension otherwise).

Result shape

process always prints JSON. Top-level keys:

{
  "language": "python",
  "metrics": { "total_lines": 0, "code_lines": 0, "comment_lines": 0, "blank_lines": 0, "total_bytes": 0, "node_count": 0, "error_count": 0, "max_depth": 0 },
  "structure": [],
  "imports": [],
  "exports": [],
  "comments": [],
  "docstrings": [],
  "symbols": [],
  "diagnostics": [],
  "chunks": []
}

metrics is populated whenever any processing runs. chunks appears only when --chunk-size is set. Empty collections are omitted from the JSON (the skip_serializing_if wire contract), so absent keys mean "nothing found", not an error.

Structure items

Each structure entry has kind (a capitalized string — "Function", "Class", "Method", "Module", "Struct", "Trait", …; language-specific kinds serialize as {"Other": "<kind>"}), name, visibility, and a nested span object with start_byte/end_byte and zero-indexed start_line/start_column/end_line/end_column. Nesting is expressed via children (e.g. methods inside a class), not a parent pointer. Optional fields: decorators, doc_comment (the attached doc comment), signature, and body_span.

Examples

# Function and class names with line numbers
ts-pack process src/service.py --structure \
  | jq '.structure[] | {kind, name, line: .span.start_line}'

# Import sources only
ts-pack process src/app.ts --imports \
  | jq '.imports[].source'

# Syntax error count (also available via metrics.error_count)
ts-pack process broken.go --diagnostics \
  | jq '.diagnostics | length'

# Build a symbol index across a tree of files
for f in $(git ls-files '*.rs'); do
  ts-pack process "$f" --symbols | jq -c --arg f "$f" '{file: $f, symbols: .symbols}'
done

SDK equivalent

from tree_sitter_language_pack import process, ProcessConfig

# ProcessConfig is a frozen dataclass — set fields in the constructor.
# structure/imports/exports default to True; add the rest you want.
config = ProcessConfig("python", symbols=True, docstrings=True)
result = process(source_code, config)
for item in result.structure:                 # ProcessResult is an object, not a dict
    print(item.kind, item.name, item.span.start_line)

The SDK also exposes the parsed tree (get_parser(...) → Parser/Tree/ Node) for running your own tree-sitter queries, and a data_extraction config flag that pulls a hierarchical key/value tree from data-format files (JSON, YAML, TOML, …) into the result's data field — neither is exposed on the CLI.

When to reach for parse instead

If the user wants the raw syntax tree rather than extracted metadata, use ts-pack parse — see the tree-sitter-language-pack-parsing-source skill.