lsp: split monolithic server.go into modules; add configurable max tokens and context strategies (minimal|window|file-on-new-func|always-full); provide flags/env fallbacks; add unit tests for helpers and context; update README; remove obsolete files

1 files changed, 76 insertions, 0 deletions

diff --git a/internal/lsp/document_test.go b/internal/lsp/document_test.go
new file mode 100644
index 0000000..8d81a99
--- /dev/null
+++ b/internal/lsp/document_test.go
@@ -0,0 +1,76 @@
+package lsp
+
+import (
+    "io"
+    "log"
+    "strings"
+    "testing"
+)
+
+func newTestServer() *Server {
+    return &Server{
+        logger: log.New(io.Discard, "", 0),
+        docs:   make(map[string]*document),
+    }
+}
+
+func TestSplitLines(t *testing.T) {
+    in := "a\r\nb\nc"
+    got := splitLines(in)
+    want := []string{"a", "b", "c"}
+    if len(got) != len(want) {
+        t.Fatalf("len mismatch: got %d want %d", len(got), len(want))
+    }
+    for i := range want {
+        if got[i] != want[i] {
+            t.Fatalf("line %d: got %q want %q", i, got[i], want[i])
+        }
+    }
+}
+
+func TestLineContext(t *testing.T) {
+    s := newTestServer()
+    src := "package main\n\nfunc add(a, b int) int {\n\treturn a + b\n}\n"
+    uri := "file:///test.go"
+    s.setDocument(uri, src)
+
+    // Position on the return line (line 3, zero-based)
+    above, current, below, funcCtx := s.lineContext(uri, Position{Line: 3, Character: 0})
+
+    if want := "func add(a, b int) int {"; funcCtx != want {
+        t.Fatalf("funcCtx got %q want %q", funcCtx, want)
+    }
+    if want := "func add(a, b int) int {"; above != want {
+        t.Fatalf("above got %q want %q", above, want)
+    }
+    if want := "\treturn a + b"; current != want {
+        t.Fatalf("current got %q want %q", current, want)
+    }
+    if want := "}"; below != want {
+        t.Fatalf("below got %q want %q", below, want)
+    }
+}
+
+func TestLineContext_EmptyDoc(t *testing.T) {
+    s := newTestServer()
+    a, c, b, f := s.lineContext("file:///missing.go", Position{Line: 0, Character: 0})
+    if a != "" || b != "" || c != "" || f != "" {
+        t.Fatalf("expected all empty for missing doc; got above=%q current=%q below=%q func=%q", a, c, b, f)
+    }
+}
+
+func TestTrimLen(t *testing.T) {
+    long := strings.Repeat("a", 205)
+    got := trimLen(long)
+    want := strings.Repeat("a", 200) + "…"
+    if got != want {
+        t.Fatalf("trimLen got %q want %q", got, want)
+    }
+}
+
+func TestFirstLine(t *testing.T) {
+    s := "first line\r\nsecond line"
+    if got := firstLine(s); got != "first line" {
+        t.Fatalf("firstLine got %q want %q", got, "first line")
+    }
+}