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// Copyright 2021 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package main
import (
"encoding/csv"
"fmt"
"math"
"os"
"sort"
"github.com/google/syzkaller/pkg/stats"
)
type Cell = interface{}
// All tables that syz-testbed generates have named columns and rows.
// Table type simplifies generation and processing of such tables.
type Table struct {
TopLeftHeader string
ColumnHeaders []string
Cells map[string]map[string]Cell
}
type ValueCell struct {
Value float64
Sample *stats.Sample
PercentChange *float64
PValue *float64
}
type RatioCell struct {
TrueCount int
TotalCount int
}
type BoolCell struct {
Value bool
}
func NewValueCell(sample *stats.Sample) *ValueCell {
return &ValueCell{Value: sample.Median(), Sample: sample}
}
func (c *ValueCell) String() string {
const fractionCutoff = 100
if math.Abs(c.Value) < fractionCutoff {
return fmt.Sprintf("%.1f", c.Value)
}
return fmt.Sprintf("%.0f", math.Round(c.Value))
}
func NewRatioCell(trueCount, totalCount int) *RatioCell {
return &RatioCell{trueCount, totalCount}
}
func (c *RatioCell) Float64() float64 {
if c.TotalCount == 0 {
return 0
}
return float64(c.TrueCount) / float64(c.TotalCount)
}
func (c *RatioCell) String() string {
return fmt.Sprintf("%.1f%% (%d/%d)", c.Float64()*100.0, c.TrueCount, c.TotalCount)
}
func NewBoolCell(value bool) *BoolCell {
return &BoolCell{
Value: value,
}
}
func (c *BoolCell) String() string {
if c.Value {
return "YES"
}
return "NO"
}
func NewTable(topLeft string, columns ...string) *Table {
return &Table{
TopLeftHeader: topLeft,
ColumnHeaders: columns,
}
}
func (t *Table) Get(row, column string) Cell {
if t.Cells == nil {
return nil
}
rowMap := t.Cells[row]
if rowMap == nil {
return nil
}
return rowMap[column]
}
func (t *Table) Set(row, column string, value Cell) {
if t.Cells == nil {
t.Cells = make(map[string]map[string]Cell)
}
rowMap, ok := t.Cells[row]
if !ok {
rowMap = make(map[string]Cell)
t.Cells[row] = rowMap
}
rowMap[column] = value
}
func (t *Table) AddColumn(column string) {
t.ColumnHeaders = append(t.ColumnHeaders, column)
}
func (t *Table) AddRow(row string, cells ...Cell) {
if len(cells) != len(t.ColumnHeaders) {
panic("AddRow: the length of the row does not equal the number of columns")
}
for i, col := range t.ColumnHeaders {
t.Set(row, col, cells[i])
}
}
func (t *Table) SortedRows() []string {
rows := []string{}
for key := range t.Cells {
rows = append(rows, key)
}
sort.Strings(rows)
return rows
}
func (t *Table) ToStrings() [][]string {
table := [][]string{}
headers := append([]string{t.TopLeftHeader}, t.ColumnHeaders...)
table = append(table, headers)
if t.Cells != nil {
rowHeaders := t.SortedRows()
for _, row := range rowHeaders {
tableRow := []string{row}
for _, column := range t.ColumnHeaders {
tableRow = append(tableRow, fmt.Sprintf("%s", t.Get(row, column)))
}
table = append(table, tableRow)
}
}
return table
}
func (t *Table) SaveAsCsv(fileName string) error {
f, err := os.Create(fileName)
if err != nil {
return err
}
defer f.Close()
return csv.NewWriter(f).WriteAll(t.ToStrings())
}
func (t *Table) SetRelativeValues(baseColumn string) error {
for rowName, row := range t.Cells {
baseCell := t.Get(rowName, baseColumn)
if baseCell == nil {
continue
}
baseValueCell, ok := baseCell.(*ValueCell)
if !ok {
return fmt.Errorf("base column cell is not a ValueCell, %T", baseCell)
}
baseSample := baseValueCell.Sample.RemoveOutliers()
for column, cell := range row {
if column == baseColumn {
continue
}
valueCell, ok := cell.(*ValueCell)
if !ok {
continue
}
if baseValueCell.Value != 0 {
valueDiff := valueCell.Value - baseValueCell.Value
valueCell.PercentChange = new(float64)
*valueCell.PercentChange = valueDiff / baseValueCell.Value * 100
}
cellSample := valueCell.Sample.RemoveOutliers()
pval, err := stats.UTest(baseSample, cellSample)
if err == nil {
// Sometimes it fails because there are too few samples.
valueCell.PValue = new(float64)
*valueCell.PValue = pval
}
}
}
return nil
}
func (t *Table) GetFooterValue(column string) Cell {
nonEmptyCells := 0
ratioCells := []*RatioCell{}
boolCells := []*BoolCell{}
valueCells := []*ValueCell{}
for rowName := range t.Cells {
cell := t.Get(rowName, column)
if cell == nil {
continue
}
nonEmptyCells++
switch v := cell.(type) {
case *RatioCell:
ratioCells = append(ratioCells, v)
case *BoolCell:
boolCells = append(boolCells, v)
case *ValueCell:
valueCells = append(valueCells, v)
}
}
if nonEmptyCells == 0 {
return ""
}
switch nonEmptyCells {
case len(ratioCells):
var sum, count float64
for _, cell := range ratioCells {
sum += cell.Float64()
count++
}
return fmt.Sprintf("%.1f%%", sum/count*100.0)
case len(valueCells):
var sum, count float64
for _, cell := range valueCells {
sum += cell.Value
count++
}
return fmt.Sprintf("%.1f", sum/count)
case len(boolCells):
yes := 0
for _, cell := range boolCells {
if cell.Value {
yes++
}
}
return NewRatioCell(yes, len(t.Cells))
default:
// Column has mixed type cells, we cannot do anything here.
return ""
}
}
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