mirror of
https://github.com/golang/go
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bf6e7d25bf
We should instead treat nil content as an empty file. Change-Id: I45f1d1c9f3382d2ef7f6d9769c808fd871d603e3 Reviewed-on: https://go-review.googlesource.com/c/tools/+/252122 Run-TryBot: Rebecca Stambler <rstambler@golang.org> Reviewed-by: Heschi Kreinick <heschi@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
323 lines
8.2 KiB
Go
323 lines
8.2 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package span_test
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import (
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"strings"
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"testing"
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"golang.org/x/tools/internal/span"
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)
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// The funny character below is 4 bytes long in UTF-8; two UTF-16 code points
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var funnyString = []byte("𐐀23\n𐐀45")
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var toUTF16Tests = []struct {
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scenario string
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input []byte
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line int // 1-indexed count
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col int // 1-indexed byte position in line
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offset int // 0-indexed byte offset into input
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resUTF16col int // 1-indexed UTF-16 col number
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pre string // everything before the cursor on the line
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post string // everything from the cursor onwards
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err string // expected error string in call to ToUTF16Column
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issue *bool
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}{
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{
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scenario: "cursor missing content",
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input: nil,
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err: "ToUTF16Column: point is missing position",
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},
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{
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scenario: "cursor missing position",
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input: funnyString,
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line: -1,
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col: -1,
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err: "ToUTF16Column: point is missing position",
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},
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{
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scenario: "cursor missing offset",
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input: funnyString,
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line: 1,
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col: 1,
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offset: -1,
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err: "ToUTF16Column: point is missing offset",
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},
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{
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scenario: "zero length input; cursor at first col, first line",
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input: []byte(""),
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line: 1,
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col: 1,
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offset: 0,
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resUTF16col: 1,
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},
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{
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scenario: "cursor before funny character; first line",
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input: funnyString,
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line: 1,
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col: 1,
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offset: 0,
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resUTF16col: 1,
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pre: "",
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post: "𐐀23",
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},
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{
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scenario: "cursor after funny character; first line",
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input: funnyString,
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line: 1,
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col: 5, // 4 + 1 (1-indexed)
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offset: 4,
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resUTF16col: 3, // 2 + 1 (1-indexed)
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pre: "𐐀",
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post: "23",
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},
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{
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scenario: "cursor after last character on first line",
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input: funnyString,
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line: 1,
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col: 7, // 4 + 1 + 1 + 1 (1-indexed)
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offset: 6, // 4 + 1 + 1
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resUTF16col: 5, // 2 + 1 + 1 + 1 (1-indexed)
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pre: "𐐀23",
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post: "",
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},
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{
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scenario: "cursor before funny character; second line",
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input: funnyString,
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line: 2,
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col: 1,
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offset: 7, // length of first line
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resUTF16col: 1,
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pre: "",
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post: "𐐀45",
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},
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{
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scenario: "cursor after funny character; second line",
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input: funnyString,
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line: 1,
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col: 5, // 4 + 1 (1-indexed)
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offset: 11, // 7 (length of first line) + 4
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resUTF16col: 3, // 2 + 1 (1-indexed)
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pre: "𐐀",
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post: "45",
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},
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{
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scenario: "cursor after last character on second line",
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input: funnyString,
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line: 2,
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col: 7, // 4 + 1 + 1 + 1 (1-indexed)
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offset: 13, // 7 (length of first line) + 4 + 1 + 1
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resUTF16col: 5, // 2 + 1 + 1 + 1 (1-indexed)
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pre: "𐐀45",
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post: "",
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},
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{
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scenario: "cursor beyond end of file",
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input: funnyString,
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line: 2,
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col: 8, // 4 + 1 + 1 + 1 + 1 (1-indexed)
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offset: 14, // 4 + 1 + 1 + 1
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err: "ToUTF16Column: offsets 7-14 outside file contents (13)",
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},
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}
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var fromUTF16Tests = []struct {
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scenario string
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input []byte
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line int // 1-indexed line number (isn't actually used)
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offset int // 0-indexed byte offset to beginning of line
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utf16col int // 1-indexed UTF-16 col number
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resCol int // 1-indexed byte position in line
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resOffset int // 0-indexed byte offset into input
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pre string // everything before the cursor on the line
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post string // everything from the cursor onwards
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err string // expected error string in call to ToUTF16Column
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}{
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{
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scenario: "zero length input; cursor at first col, first line",
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input: []byte(""),
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line: 1,
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offset: 0,
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utf16col: 1,
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resCol: 1,
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resOffset: 0,
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pre: "",
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post: "",
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},
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{
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scenario: "missing offset",
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input: funnyString,
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line: 1,
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offset: -1,
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err: "FromUTF16Column: point is missing offset",
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},
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{
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scenario: "cursor before funny character",
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input: funnyString,
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line: 1,
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utf16col: 1,
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resCol: 1,
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resOffset: 0,
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pre: "",
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post: "𐐀23",
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},
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{
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scenario: "cursor after funny character",
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input: funnyString,
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line: 1,
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utf16col: 3,
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resCol: 5,
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resOffset: 4,
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pre: "𐐀",
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post: "23",
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},
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{
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scenario: "cursor after last character on line",
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input: funnyString,
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line: 1,
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utf16col: 5,
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resCol: 7,
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resOffset: 6,
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pre: "𐐀23",
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post: "",
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},
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{
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scenario: "cursor beyond last character on line",
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input: funnyString,
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line: 1,
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offset: 0,
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utf16col: 6,
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resCol: 7,
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resOffset: 6,
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pre: "𐐀23",
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post: "",
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},
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{
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scenario: "cursor before funny character; second line",
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input: funnyString,
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line: 2,
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offset: 7, // length of first line
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utf16col: 1,
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resCol: 1,
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resOffset: 7,
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pre: "",
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post: "𐐀45",
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},
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{
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scenario: "cursor after funny character; second line",
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input: funnyString,
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line: 2,
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offset: 7, // length of first line
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utf16col: 3, // 2 + 1 (1-indexed)
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resCol: 5, // 4 + 1 (1-indexed)
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resOffset: 11, // 7 (length of first line) + 4
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pre: "𐐀",
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post: "45",
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},
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{
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scenario: "cursor after last character on second line",
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input: funnyString,
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line: 2,
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offset: 7, // length of first line
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utf16col: 5, // 2 + 1 + 1 + 1 (1-indexed)
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resCol: 7, // 4 + 1 + 1 + 1 (1-indexed)
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resOffset: 13, // 7 (length of first line) + 4 + 1 + 1
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pre: "𐐀45",
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post: "",
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},
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{
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scenario: "cursor beyond end of file",
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input: funnyString,
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line: 2,
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offset: 7,
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utf16col: 6, // 2 + 1 + 1 + 1 + 1(1-indexed)
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resCol: 8, // 4 + 1 + 1 + 1 + 1 (1-indexed)
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resOffset: 14, // 7 (length of first line) + 4 + 1 + 1 + 1
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err: "FromUTF16Column: chr goes beyond the content",
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},
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{
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scenario: "offset beyond end of file",
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input: funnyString,
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line: 2,
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offset: 14,
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utf16col: 2,
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err: "FromUTF16Column: offset (14) greater than length of content (13)",
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},
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}
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func TestToUTF16(t *testing.T) {
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for _, e := range toUTF16Tests {
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t.Run(e.scenario, func(t *testing.T) {
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if e.issue != nil && !*e.issue {
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t.Skip("expected to fail")
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}
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p := span.NewPoint(e.line, e.col, e.offset)
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got, err := span.ToUTF16Column(p, e.input)
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if err != nil {
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if err.Error() != e.err {
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t.Fatalf("expected error %v; got %v", e.err, err)
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}
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return
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}
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if e.err != "" {
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t.Fatalf("unexpected success; wanted %v", e.err)
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}
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if got != e.resUTF16col {
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t.Fatalf("expected result %v; got %v", e.resUTF16col, got)
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}
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pre, post := getPrePost(e.input, p.Offset())
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if string(pre) != e.pre {
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t.Fatalf("expected #%d pre %q; got %q", p.Offset(), e.pre, pre)
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}
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if string(post) != e.post {
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t.Fatalf("expected #%d, post %q; got %q", p.Offset(), e.post, post)
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}
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})
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}
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}
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func TestFromUTF16(t *testing.T) {
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for _, e := range fromUTF16Tests {
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t.Run(e.scenario, func(t *testing.T) {
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p := span.NewPoint(e.line, 1, e.offset)
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p, err := span.FromUTF16Column(p, e.utf16col, []byte(e.input))
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if err != nil {
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if err.Error() != e.err {
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t.Fatalf("expected error %v; got %v", e.err, err)
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}
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return
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}
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if e.err != "" {
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t.Fatalf("unexpected success; wanted %v", e.err)
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}
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if p.Column() != e.resCol {
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t.Fatalf("expected resulting col %v; got %v", e.resCol, p.Column())
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}
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if p.Offset() != e.resOffset {
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t.Fatalf("expected resulting offset %v; got %v", e.resOffset, p.Offset())
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}
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pre, post := getPrePost(e.input, p.Offset())
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if string(pre) != e.pre {
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t.Fatalf("expected #%d pre %q; got %q", p.Offset(), e.pre, pre)
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}
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if string(post) != e.post {
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t.Fatalf("expected #%d post %q; got %q", p.Offset(), e.post, post)
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}
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})
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}
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}
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func getPrePost(content []byte, offset int) (string, string) {
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pre, post := string(content)[:offset], string(content)[offset:]
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if i := strings.LastIndex(pre, "\n"); i >= 0 {
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pre = pre[i+1:]
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}
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if i := strings.IndexRune(post, '\n'); i >= 0 {
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post = post[:i]
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}
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return pre, post
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}
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