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jeremybenn |
// Copyright 2010 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 token
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import (
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"fmt"
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"testing"
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)
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func checkPos(t *testing.T, msg string, p, q Position) {
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if p.Filename != q.Filename {
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t.Errorf("%s: expected filename = %q; got %q", msg, q.Filename, p.Filename)
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}
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if p.Offset != q.Offset {
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t.Errorf("%s: expected offset = %d; got %d", msg, q.Offset, p.Offset)
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}
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if p.Line != q.Line {
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t.Errorf("%s: expected line = %d; got %d", msg, q.Line, p.Line)
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}
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if p.Column != q.Column {
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t.Errorf("%s: expected column = %d; got %d", msg, q.Column, p.Column)
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}
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}
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func TestNoPos(t *testing.T) {
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if NoPos.IsValid() {
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t.Errorf("NoPos should not be valid")
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}
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var fset *FileSet
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checkPos(t, "nil NoPos", fset.Position(NoPos), Position{})
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fset = NewFileSet()
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checkPos(t, "fset NoPos", fset.Position(NoPos), Position{})
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}
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var tests = []struct {
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filename string
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source []byte // may be nil
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size int
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lines []int
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}{
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{"a", []byte{}, 0, []int{}},
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{"b", []byte("01234"), 5, []int{0}},
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{"c", []byte("\n\n\n\n\n\n\n\n\n"), 9, []int{0, 1, 2, 3, 4, 5, 6, 7, 8}},
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{"d", nil, 100, []int{0, 5, 10, 20, 30, 70, 71, 72, 80, 85, 90, 99}},
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{"e", nil, 777, []int{0, 80, 100, 120, 130, 180, 267, 455, 500, 567, 620}},
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{"f", []byte("package p\n\nimport \"fmt\""), 23, []int{0, 10, 11}},
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{"g", []byte("package p\n\nimport \"fmt\"\n"), 24, []int{0, 10, 11}},
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{"h", []byte("package p\n\nimport \"fmt\"\n "), 25, []int{0, 10, 11, 24}},
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}
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func linecol(lines []int, offs int) (int, int) {
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prevLineOffs := 0
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for line, lineOffs := range lines {
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if offs < lineOffs {
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return line, offs - prevLineOffs + 1
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}
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prevLineOffs = lineOffs
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}
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return len(lines), offs - prevLineOffs + 1
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}
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func verifyPositions(t *testing.T, fset *FileSet, f *File, lines []int) {
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for offs := 0; offs < f.Size(); offs++ {
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p := f.Pos(offs)
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offs2 := f.Offset(p)
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if offs2 != offs {
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t.Errorf("%s, Offset: expected offset %d; got %d", f.Name(), offs, offs2)
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}
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line, col := linecol(lines, offs)
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msg := fmt.Sprintf("%s (offs = %d, p = %d)", f.Name(), offs, p)
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checkPos(t, msg, f.Position(f.Pos(offs)), Position{f.Name(), offs, line, col})
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checkPos(t, msg, fset.Position(p), Position{f.Name(), offs, line, col})
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}
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}
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func makeTestSource(size int, lines []int) []byte {
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src := make([]byte, size)
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for _, offs := range lines {
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if offs > 0 {
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src[offs-1] = '\n'
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}
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}
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return src
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}
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func TestPositions(t *testing.T) {
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const delta = 7 // a non-zero base offset increment
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fset := NewFileSet()
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for _, test := range tests {
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// verify consistency of test case
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if test.source != nil && len(test.source) != test.size {
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t.Errorf("%s: inconsistent test case: expected file size %d; got %d", test.filename, test.size, len(test.source))
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}
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// add file and verify name and size
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f := fset.AddFile(test.filename, fset.Base()+delta, test.size)
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if f.Name() != test.filename {
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t.Errorf("expected filename %q; got %q", test.filename, f.Name())
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}
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if f.Size() != test.size {
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t.Errorf("%s: expected file size %d; got %d", f.Name(), test.size, f.Size())
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}
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if fset.File(f.Pos(0)) != f {
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t.Errorf("%s: f.Pos(0) was not found in f", f.Name())
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}
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// add lines individually and verify all positions
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for i, offset := range test.lines {
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f.AddLine(offset)
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if f.LineCount() != i+1 {
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t.Errorf("%s, AddLine: expected line count %d; got %d", f.Name(), i+1, f.LineCount())
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}
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// adding the same offset again should be ignored
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f.AddLine(offset)
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if f.LineCount() != i+1 {
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t.Errorf("%s, AddLine: expected unchanged line count %d; got %d", f.Name(), i+1, f.LineCount())
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}
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verifyPositions(t, fset, f, test.lines[0:i+1])
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}
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// add lines with SetLines and verify all positions
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if ok := f.SetLines(test.lines); !ok {
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t.Errorf("%s: SetLines failed", f.Name())
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}
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if f.LineCount() != len(test.lines) {
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t.Errorf("%s, SetLines: expected line count %d; got %d", f.Name(), len(test.lines), f.LineCount())
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}
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verifyPositions(t, fset, f, test.lines)
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// add lines with SetLinesForContent and verify all positions
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src := test.source
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if src == nil {
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// no test source available - create one from scratch
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src = makeTestSource(test.size, test.lines)
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}
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f.SetLinesForContent(src)
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if f.LineCount() != len(test.lines) {
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t.Errorf("%s, SetLinesForContent: expected line count %d; got %d", f.Name(), len(test.lines), f.LineCount())
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}
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verifyPositions(t, fset, f, test.lines)
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}
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}
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func TestLineInfo(t *testing.T) {
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fset := NewFileSet()
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f := fset.AddFile("foo", fset.Base(), 500)
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lines := []int{0, 42, 77, 100, 210, 220, 277, 300, 333, 401}
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// add lines individually and provide alternative line information
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for _, offs := range lines {
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f.AddLine(offs)
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f.AddLineInfo(offs, "bar", 42)
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}
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// verify positions for all offsets
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for offs := 0; offs <= f.Size(); offs++ {
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p := f.Pos(offs)
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_, col := linecol(lines, offs)
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msg := fmt.Sprintf("%s (offs = %d, p = %d)", f.Name(), offs, p)
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checkPos(t, msg, f.Position(f.Pos(offs)), Position{"bar", offs, 42, col})
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checkPos(t, msg, fset.Position(p), Position{"bar", offs, 42, col})
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}
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}
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func TestFiles(t *testing.T) {
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fset := NewFileSet()
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for i, test := range tests {
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fset.AddFile(test.filename, fset.Base(), test.size)
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j := 0
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fset.Iterate(func(f *File) bool {
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if f.Name() != tests[j].filename {
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t.Errorf("expected filename = %s; got %s", tests[j].filename, f.Name())
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}
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j++
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return true
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})
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if j != i+1 {
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t.Errorf("expected %d files; got %d", i+1, j)
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}
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}
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}
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