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go.tools/cmd/cover: use a gradient to colorize "count" profiles 

R=r
CC=golang-dev
https://golang.org/cl/10858047
This commit is contained in:
Andrew Gerrand 2013-07-05 13:53:09 +10:00
parent 4ca3d7e9da
commit d9e6cbb135
1 changed files with 38 additions and 7 deletions
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45
cmd/cover/html.go
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@ -11,6 +11,7 @@ import (
"html"
"io"
"io/ioutil"
"math"
"os"
"os/exec"
"path/filepath"
@ -162,18 +163,43 @@ type Token struct {
Pos int
Start bool
Count int
Norm float64 // count normalized to 0-1
}
// Tokens returns a Profile as a set of Tokens within the provided src.
func (p *Profile) Tokens(src []byte) (tokens []Token) {
line, col := 1, 1
// Find maximum counts.
max := 0
for _, b := range p.Blocks {
if b.Count > max {
max = b.Count
}
}
// Divisor for normalization.
divisor := math.Log(float64(max + 1))
// tok returns a Token, populating the Norm field with a normalized Count.
tok := func(pos int, start bool, count int) Token {
t := Token{Pos: pos, Start: start, Count: count}
if !start || count == 0 {
return t
}
if max == 1 {
t.Norm = 0.4 // "set" mode; use pale color
} else {
t.Norm = math.Log(float64(count+1)) / divisor
}
return t
}
line, col := 1, 2
for si, bi := 0, 0; si < len(src) && bi < len(p.Blocks); {
b := p.Blocks[bi]
if b.StartLine == line && b.StartCol == col {
tokens = append(tokens, Token{Pos: si, Start: true, Count: b.Count})
tokens = append(tokens, tok(si, true, b.Count))
}
if b.EndLine == line && b.EndCol == col {
tokens = append(tokens, Token{Pos: si, Start: false})
tokens = append(tokens, tok(si, false, 0))
bi++
continue // Don't advance through src; maybe the next block starts here.
}
@ -203,16 +229,21 @@ func (t tokensByPos) Less(i, j int) bool {
// source code, and tokens, and writes it to the given Writer.
func htmlGen(w io.Writer, filename string, src []byte, tokens []Token) error {
dst := bufio.NewWriter(w)
fmt.Fprintln(dst, `<body style="background: black; color: white">`)
fmt.Fprintf(dst, "<h1>%s</h1>\n<pre>", html.EscapeString(filename))
for i := range src {
for len(tokens) > 0 && tokens[0].Pos == i {
t := tokens[0]
if t.Start {
color := "#CFC" // Green
if t.Count == 0 {
color = "#FCC" // Red
c := "rgb(255, 0, 0)" // Red
if t.Count > 0 {
// Gradient from pale green (low count)
// to bright green (high count)
r := 240 - int(220*t.Norm)
b := 170 + r/3
c = fmt.Sprintf("rgb(%v, 255, %v)", r, b)
}
fmt.Fprintf(dst, `<span style="background: %v" title="%v">`, color, t.Count)
fmt.Fprintf(dst, `<span style="color: %v" title="%v">`, c, t.Count)
} else {
dst.WriteString("</span>")
}