--- /dev/null
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package span_test
+
+import (
+ "strings"
+ "testing"
+
+ "golang.org/x/tools/internal/span"
+)
+
+// The funny character below is 4 bytes long in UTF-8; two UTF-16 code points
+var funnyString = []byte("š23\nš45")
+
+var toUTF16Tests = []struct {
+ scenario string
+ input []byte
+ line int // 1-indexed count
+ col int // 1-indexed byte position in line
+ offset int // 0-indexed byte offset into input
+ resUTF16col int // 1-indexed UTF-16 col number
+ pre string // everything before the cursor on the line
+ post string // everything from the cursor onwards
+ err string // expected error string in call to ToUTF16Column
+ issue *bool
+}{
+ {
+ scenario: "cursor missing content",
+ input: nil,
+ err: "ToUTF16Column: point is missing position",
+ },
+ {
+ scenario: "cursor missing position",
+ input: funnyString,
+ line: -1,
+ col: -1,
+ err: "ToUTF16Column: point is missing position",
+ },
+ {
+ scenario: "cursor missing offset",
+ input: funnyString,
+ line: 1,
+ col: 1,
+ offset: -1,
+ err: "ToUTF16Column: point is missing offset",
+ },
+ {
+ scenario: "zero length input; cursor at first col, first line",
+ input: []byte(""),
+ line: 1,
+ col: 1,
+ offset: 0,
+ resUTF16col: 1,
+ },
+ {
+ scenario: "cursor before funny character; first line",
+ input: funnyString,
+ line: 1,
+ col: 1,
+ offset: 0,
+ resUTF16col: 1,
+ pre: "",
+ post: "š23",
+ },
+ {
+ scenario: "cursor after funny character; first line",
+ input: funnyString,
+ line: 1,
+ col: 5, // 4 + 1 (1-indexed)
+ offset: 4,
+ resUTF16col: 3, // 2 + 1 (1-indexed)
+ pre: "š",
+ post: "23",
+ },
+ {
+ scenario: "cursor after last character on first line",
+ input: funnyString,
+ line: 1,
+ col: 7, // 4 + 1 + 1 + 1 (1-indexed)
+ offset: 6, // 4 + 1 + 1
+ resUTF16col: 5, // 2 + 1 + 1 + 1 (1-indexed)
+ pre: "š23",
+ post: "",
+ },
+ {
+ scenario: "cursor before funny character; second line",
+ input: funnyString,
+ line: 2,
+ col: 1,
+ offset: 7, // length of first line
+ resUTF16col: 1,
+ pre: "",
+ post: "š45",
+ },
+ {
+ scenario: "cursor after funny character; second line",
+ input: funnyString,
+ line: 1,
+ col: 5, // 4 + 1 (1-indexed)
+ offset: 11, // 7 (length of first line) + 4
+ resUTF16col: 3, // 2 + 1 (1-indexed)
+ pre: "š",
+ post: "45",
+ },
+ {
+ scenario: "cursor after last character on second line",
+ input: funnyString,
+ line: 2,
+ col: 7, // 4 + 1 + 1 + 1 (1-indexed)
+ offset: 13, // 7 (length of first line) + 4 + 1 + 1
+ resUTF16col: 5, // 2 + 1 + 1 + 1 (1-indexed)
+ pre: "š45",
+ post: "",
+ },
+ {
+ scenario: "cursor beyond end of file",
+ input: funnyString,
+ line: 2,
+ col: 8, // 4 + 1 + 1 + 1 + 1 (1-indexed)
+ offset: 14, // 4 + 1 + 1 + 1
+ err: "ToUTF16Column: offsets 7-14 outside file contents (13)",
+ },
+}
+
+var fromUTF16Tests = []struct {
+ scenario string
+ input []byte
+ line int // 1-indexed line number (isn't actually used)
+ offset int // 0-indexed byte offset to beginning of line
+ utf16col int // 1-indexed UTF-16 col number
+ resCol int // 1-indexed byte position in line
+ resOffset int // 0-indexed byte offset into input
+ pre string // everything before the cursor on the line
+ post string // everything from the cursor onwards
+ err string // expected error string in call to ToUTF16Column
+}{
+ {
+ scenario: "zero length input; cursor at first col, first line",
+ input: []byte(""),
+ line: 1,
+ offset: 0,
+ utf16col: 1,
+ resCol: 1,
+ resOffset: 0,
+ pre: "",
+ post: "",
+ },
+ {
+ scenario: "missing offset",
+ input: funnyString,
+ line: 1,
+ offset: -1,
+ err: "FromUTF16Column: point is missing offset",
+ },
+ {
+ scenario: "cursor before funny character",
+ input: funnyString,
+ line: 1,
+ utf16col: 1,
+ resCol: 1,
+ resOffset: 0,
+ pre: "",
+ post: "š23",
+ },
+ {
+ scenario: "cursor after funny character",
+ input: funnyString,
+ line: 1,
+ utf16col: 3,
+ resCol: 5,
+ resOffset: 4,
+ pre: "š",
+ post: "23",
+ },
+ {
+ scenario: "cursor after last character on line",
+ input: funnyString,
+ line: 1,
+ utf16col: 5,
+ resCol: 7,
+ resOffset: 6,
+ pre: "š23",
+ post: "",
+ },
+ {
+ scenario: "cursor beyond last character on line",
+ input: funnyString,
+ line: 1,
+ offset: 0,
+ utf16col: 6,
+ resCol: 7,
+ resOffset: 6,
+ pre: "š23",
+ post: "",
+ },
+ {
+ scenario: "cursor before funny character; second line",
+ input: funnyString,
+ line: 2,
+ offset: 7, // length of first line
+ utf16col: 1,
+ resCol: 1,
+ resOffset: 7,
+ pre: "",
+ post: "š45",
+ },
+ {
+ scenario: "cursor after funny character; second line",
+ input: funnyString,
+ line: 2,
+ offset: 7, // length of first line
+ utf16col: 3, // 2 + 1 (1-indexed)
+ resCol: 5, // 4 + 1 (1-indexed)
+ resOffset: 11, // 7 (length of first line) + 4
+ pre: "š",
+ post: "45",
+ },
+ {
+ scenario: "cursor after last character on second line",
+ input: funnyString,
+ line: 2,
+ offset: 7, // length of first line
+ utf16col: 5, // 2 + 1 + 1 + 1 (1-indexed)
+ resCol: 7, // 4 + 1 + 1 + 1 (1-indexed)
+ resOffset: 13, // 7 (length of first line) + 4 + 1 + 1
+ pre: "š45",
+ post: "",
+ },
+ {
+ scenario: "cursor beyond end of file",
+ input: funnyString,
+ line: 2,
+ offset: 7,
+ utf16col: 6, // 2 + 1 + 1 + 1 + 1(1-indexed)
+ resCol: 8, // 4 + 1 + 1 + 1 + 1 (1-indexed)
+ resOffset: 14, // 7 (length of first line) + 4 + 1 + 1 + 1
+ err: "FromUTF16Column: chr goes beyond the content",
+ },
+ {
+ scenario: "offset beyond end of file",
+ input: funnyString,
+ line: 2,
+ offset: 14,
+ utf16col: 2,
+ err: "FromUTF16Column: offset (14) greater than length of content (13)",
+ },
+}
+
+func TestToUTF16(t *testing.T) {
+ for _, e := range toUTF16Tests {
+ t.Run(e.scenario, func(t *testing.T) {
+ if e.issue != nil && !*e.issue {
+ t.Skip("expected to fail")
+ }
+ p := span.NewPoint(e.line, e.col, e.offset)
+ got, err := span.ToUTF16Column(p, e.input)
+ if err != nil {
+ if err.Error() != e.err {
+ t.Fatalf("expected error %v; got %v", e.err, err)
+ }
+ return
+ }
+ if e.err != "" {
+ t.Fatalf("unexpected success; wanted %v", e.err)
+ }
+ if got != e.resUTF16col {
+ t.Fatalf("expected result %v; got %v", e.resUTF16col, got)
+ }
+ pre, post := getPrePost(e.input, p.Offset())
+ if string(pre) != e.pre {
+ t.Fatalf("expected #%d pre %q; got %q", p.Offset(), e.pre, pre)
+ }
+ if string(post) != e.post {
+ t.Fatalf("expected #%d, post %q; got %q", p.Offset(), e.post, post)
+ }
+ })
+ }
+}
+
+func TestFromUTF16(t *testing.T) {
+ for _, e := range fromUTF16Tests {
+ t.Run(e.scenario, func(t *testing.T) {
+ p := span.NewPoint(e.line, 1, e.offset)
+ p, err := span.FromUTF16Column(p, e.utf16col, []byte(e.input))
+ if err != nil {
+ if err.Error() != e.err {
+ t.Fatalf("expected error %v; got %v", e.err, err)
+ }
+ return
+ }
+ if e.err != "" {
+ t.Fatalf("unexpected success; wanted %v", e.err)
+ }
+ if p.Column() != e.resCol {
+ t.Fatalf("expected resulting col %v; got %v", e.resCol, p.Column())
+ }
+ if p.Offset() != e.resOffset {
+ t.Fatalf("expected resulting offset %v; got %v", e.resOffset, p.Offset())
+ }
+ pre, post := getPrePost(e.input, p.Offset())
+ if string(pre) != e.pre {
+ t.Fatalf("expected #%d pre %q; got %q", p.Offset(), e.pre, pre)
+ }
+ if string(post) != e.post {
+ t.Fatalf("expected #%d post %q; got %q", p.Offset(), e.post, post)
+ }
+ })
+ }
+}
+
+func getPrePost(content []byte, offset int) (string, string) {
+ pre, post := string(content)[:offset], string(content)[offset:]
+ if i := strings.LastIndex(pre, "\n"); i >= 0 {
+ pre = pre[i+1:]
+ }
+ if i := strings.IndexRune(post, '\n'); i >= 0 {
+ post = post[:i]
+ }
+ return pre, post
+}
projects / dotfiles / .git / blobdiff