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* Go resolveCallSites — name-based catalog lookup.
*
* Tree-sitter has no symbol table, so we resolve by simple name. For
* each call site:
*
* 1. Decode the called expression. Four shapes matter:
* - `foo(args)` — identifier; target is `foo`.
* - `obj.Method(args)` — selector_expression; target is the
* trailing `field_identifier`.
* - `pkg.Func(args)` — same shape; AST-indistinguishable
* from method calls without a type
* checker. We use the field name.
* - `Type{}.method(args)` — selector_expression on a
* composite_literal; we still extract
* the field name.
*
* 2. Look up matching catalog entries by simple name. Confidence
* ladder mirrors graph-python (no receiver-type narrowing in
* tree-sitter-go because the receiver type can't be known without
* type info):
* - 0 matches → `to: []`, resolution `'unknown'`, confidence `'low'`
* - 1 match → `to: [hash]`, resolution `'static'`, confidence `'medium'`
* - N matches → `to: [allHashes]`, resolution `'method-dispatch'`,
* confidence `'low'`
*
* Per I-4: this function does NOT mutate the input catalog.
*/
import { readFileSync } from 'node:fs';
import { join, posix } from 'node:path';
import { logger } from '@opensip-tools/core';
import {
appendEdge,
createMutableStats,
pushCreationEdge,
truncateForCallEdge,
} from '@opensip-tools/graph';
import type { GoParsedFile, GoParsedProject } from './parse.js';
import type {
Catalog,
CallEdge,
DependencyEdge,
DependencySiteRecord,
FunctionOccurrence,
MutableStats,
ResolutionStats,
ResolveInput,
ResolveOutput,
} from '@opensip-tools/graph';
import type Parser from 'tree-sitter';
function goPosition(node: Parser.SyntaxNode, file: GoParsedFile): {
readonly line: number;
readonly column: number;
readonly text: string;
} {
return {
line: node.startPosition.row + 1,
column: node.startPosition.column,
text: file.source.slice(node.startIndex, node.endIndex),
};
}
export function resolveCallSites(input: ResolveInput<GoParsedProject>): ResolveOutput {
logger.info({ evt: 'graph.edges.start', module: 'graph:edges:go' });
const byName = buildNameIndex(input.catalog.functions);
const edgesByOwner = new Map<string, CallEdge[]>();
const stats = createMutableStats();
for (const r of input.callSites) {
const node = r.nodeRef as Parser.SyntaxNode;
const file = r.sourceFileRef as GoParsedFile;
if (r.kind === 'creation') {
if (r.childHash === undefined) continue;
pushCreationEdge(node, file, r.ownerHash, r.childHash, edgesByOwner, stats, goPosition);
continue;
}
pushCallEdge(node, file, r.ownerHash, byName, edgesByOwner, stats);
}
const finalStats: ResolutionStats = {
totalCallSites: stats.totalCallSites,
resolvedHigh: stats.resolvedHigh,
resolvedMedium: stats.resolvedMedium,
resolvedLow: stats.resolvedLow,
unresolved: stats.unresolved,
};
logger.info({ evt: 'graph.edges.complete', module: 'graph:edges:go', ...finalStats });
// Phase 4 (DEC-498): resolve dependency sites if any. Mirrors the
// Python adapter's resolveDependencies pattern, adapted to Go's
// `go.mod`-mediated module-path resolution.
const dependenciesByOwner =
input.dependencySites && input.dependencySites.length > 0
? resolveDependencies(input.dependencySites, input.catalog, input.projectDirAbs)
: undefined;
return dependenciesByOwner === undefined
? { edgesByOwner, stats: finalStats }
: { edgesByOwner, dependenciesByOwner, stats: finalStats };
}
/**
* Resolve Go import sites to target module-init bodyHashes. Imports
* resolving to a same-module source file (via `go.mod`'s declared
* module path) map to that package directory's module-init occurrences;
* imports resolving to stdlib (`fmt`, `os`, …), third-party (`github.com/
* external/lib`), or unresolvable shapes produce unresolved
* `DependencyEdge` entries with `to: []` and the raw specifier carried
* in `specifier` for downstream attribution.
*
* Resolution rules:
*
* 1. Read `go.mod` from `projectDirAbs`. The first `module <path>`
* line declares the module's own path. If `go.mod` is missing or
* unparseable, ALL imports go unresolved.
*
* 2. Build a `filePath → module-init bodyHash` map from the catalog.
*
* 3. For each dependency site, classify the import path:
* - **Internal** — starts with `<module-path>/` (or equals it):
* strip the module-path prefix to get a project-relative
* package-directory path. `to` is every catalog module-init
* occurrence whose `filePath` lives inside that directory (Go
* packages can span multiple files — `pkg/foo/foo.go`,
* `pkg/foo/helpers.go`).
* - **External** — doesn't start with module path (stdlib like
* `fmt`, third-party like `github.com/x/y`, or relative-style
* `./pkg` / `../foo` not common in modern Go): `to: []`.
*
* 4. Blank imports (`_ "path"`) and dot imports (`. "path"`) resolve
* the same as plain imports — the prefix only affects Go's import
* semantics, not the dependency target.
*
* Phase 4 of opensip's substrate consolidation (DEC-498).
*/
function resolveDependencies(
sites: readonly DependencySiteRecord[],
catalog: Catalog,
projectDirAbs: string,
): ReadonlyMap<string, readonly DependencyEdge[]> {
const modulePath = readGoModulePath(projectDirAbs);
// Build filePath → module-init bodyHash map. Catalog occurrences carry
// project-relative POSIX filePath; module-init kind is filtered.
const moduleInitByFilePath = new Map<string, string>();
for (const occs of Object.values(catalog.functions)) {
if (!occs) continue;
for (const o of occs) {
if (o.kind === 'module-init') moduleInitByFilePath.set(o.filePath, o.bodyHash);
}
}
const out = new Map<string, DependencyEdge[]>();
for (const site of sites) {
const to = resolveGoImportPath(site.specifier, modulePath, moduleInitByFilePath);
const edge: DependencyEdge = {
to,
line: site.line,
column: site.column,
specifier: site.specifier,
};
const existing = out.get(site.ownerHash);
if (existing === undefined) {out.set(site.ownerHash, [edge]);}
else {existing.push(edge);}
}
return out;
}
/**
* Extract the module path from `go.mod`. We do a line-grep on `^module
* <path>$` rather than parse the full grammar — replace directives,
* vendor blocks, retract statements, and toolchain lines are all
* out-of-scope for v1. Returns `null` when `go.mod` is missing or no
* `module` line is found.
*
* Edge cases NOT handled (deferred): `replace` directives that retarget
* a module path, `go.work` multi-module workspaces (each module's own
* `go.mod` is read independently in this v1).
*/
function readGoModulePath(projectDirAbs: string): string | null {
let content: string;
try {
content = readFileSync(join(projectDirAbs, 'go.mod'), 'utf8');
} catch {
return null;
}
for (const rawLine of content.split('\n')) {
const line = rawLine.trim();
// Skip comments and blank lines.
if (line.length === 0 || line.startsWith('//')) continue;
// `module <path>` — capture the bare path. Quoted form `module "<path>"`
// is legal in go.mod; strip optional quotes.
const match = /^module\s+("([^"]+)"|(\S+))\s*$/.exec(line);
if (match) return match[2] ?? match[3] ?? null;
}
return null;
}
/**
* Resolve one Go import path to its target module-init bodyHash(es).
* Returns `[]` when the import is external (stdlib, third-party, or
* unresolvable relative).
*
* Multi-file packages: a single import like `"github.com/me/myproj/pkg/foo"`
* corresponds to the DIRECTORY `pkg/foo/`, which may contain `foo.go`,
* `helpers.go`, etc. The returned `to` array includes every matching
* module-init bodyHash — the engine model's polymorphic-targets case.
*/
function resolveGoImportPath(
specifier: string,
modulePath: string | null,
moduleInitByFilePath: ReadonlyMap<string, string>,
): readonly string[] {
if (modulePath === null) return [];
// Internal: import path equals or is rooted under the module path.
if (specifier === modulePath) {
return collectGoPackageMembers('', moduleInitByFilePath);
}
const prefix = `${modulePath}/`;
if (!specifier.startsWith(prefix)) return [];
// The package-directory path is the import path with the module
// prefix stripped. Forward-slashes are canonical in both go import
// paths and catalog filePaths.
const packageDir = specifier.slice(prefix.length);
return collectGoPackageMembers(packageDir, moduleInitByFilePath);
}
/**
* Enumerate every module-init in the catalog whose filePath sits
* directly inside `packageDir`. Go's package = directory, with `.go`
* files at the directory's top level (subdirectories are separate
* packages). Excludes `_test.go` files from production-import targets?
* NO — the catalog already carries every walked `.go`, and `_test.go`
* files belong to the same package directory at the AST level; we
* include them as edge targets and let downstream rules filter by
* `inTestFile` if needed.
*/
function collectGoPackageMembers(
packageDir: string,
moduleInitByFilePath: ReadonlyMap<string, string>,
): readonly string[] {
// packageDir is empty when the module path itself is imported. In
// that case, the package members live directly at the project root.
const out: string[] = [];
for (const [filePath, hash] of moduleInitByFilePath) {
if (!filePath.endsWith('.go')) continue;
const dir = posix.dirname(filePath);
const normalizedDir = dir === '.' ? '' : dir;
if (normalizedDir === packageDir) out.push(hash);
}
return out;
}
function buildNameIndex(
functions: Readonly<Record<string, readonly FunctionOccurrence[]>>,
): ReadonlyMap<string, readonly string[]> {
const out = new Map<string, string[]>();
for (const [name, occs] of Object.entries(functions)) {
if (!occs) continue;
if (name.startsWith('<')) continue;
const list: string[] = out.get(name) ?? [];
for (const o of occs) list.push(o.bodyHash);
if (list.length > 0) out.set(name, list);
}
return out;
}
function pushCallEdge(
node: Parser.SyntaxNode,
file: GoParsedFile,
ownerHash: string,
byName: ReadonlyMap<string, readonly string[]>,
edgesByOwner: Map<string, CallEdge[]>,
stats: MutableStats,
): void {
stats.totalCallSites++;
const target = extractCallTargetName(node);
const pos = goPosition(node, file);
const truncated = truncateForCallEdge(pos.text);
const discarded = isReturnValueDiscarded(node);
const edge = buildGoCallEdge(target, byName, {
line: pos.line,
column: pos.column,
text: truncated,
discarded,
});
appendEdge(edgesByOwner, ownerHash, edge);
stats.apply(edge);
}
interface CallEdgeLoc {
readonly line: number;
readonly column: number;
readonly text: string;
readonly discarded: boolean;
}
function buildGoCallEdge(
target: string | null,
byName: ReadonlyMap<string, readonly string[]>,
loc: CallEdgeLoc,
): CallEdge {
if (target === null) {
return { to: [], ...loc, resolution: 'unknown', confidence: 'low' };
}
const matches = byName.get(target);
if (!matches || matches.length === 0) {
return { to: [], ...loc, resolution: 'unknown', confidence: 'low' };
}
if (matches.length === 1) {
return { to: [...matches], ...loc, resolution: 'static', confidence: 'medium' };
}
return { to: [...matches], ...loc, resolution: 'method-dispatch', confidence: 'low' };
}
/**
* Decode a `call_expression` node's target into a simple name. Returns
* null when we don't recognize the shape (e.g. type assertion call,
* map index call) — those become unresolved edges.
*/
function extractCallTargetName(node: Parser.SyntaxNode): string | null {
// tree-sitter-go `call_expression` has a `function` field for the callee.
const fn = node.childForFieldName('function');
if (!fn) return null;
if (fn.type === 'identifier') return fn.text;
if (fn.type === 'selector_expression') {
const field = fn.childForFieldName('field');
return field ? field.text : null;
}
// Other shapes (index_expression, parenthesized_expression, etc.) —
// not common for the call-graph rules we ship today.
return null;
}
/**
* The call's return value is discarded when the call expression is
* the entire expression of an expression_statement. Go's `go foo()`
* and `defer foo()` statements also discard the return.
*/
function isReturnValueDiscarded(node: Parser.SyntaxNode): boolean {
let parent: Parser.SyntaxNode | null = node.parent;
while (parent) {
if (parent.type === 'parenthesized_expression') {
parent = parent.parent;
continue;
}
return (
parent.type === 'expression_statement' ||
parent.type === 'go_statement' ||
parent.type === 'defer_statement'
);
}
/* v8 ignore next */
return false;
}
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