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|
package ansi
import (
"bytes"
"io"
"strings"
"text/template"
"github.com/muesli/termenv"
)
// BaseElement renders a styled primitive element.
type BaseElement struct {
Token string
Prefix string
Suffix string
Style StylePrimitive
}
func formatToken(format string, token string) (string, error) {
var b bytes.Buffer
v := make(map[string]interface{})
v["text"] = token
tmpl, err := template.New(format).Funcs(TemplateFuncMap).Parse(format)
if err != nil {
return "", err
}
err = tmpl.Execute(&b, v)
return b.String(), err
}
func renderText(w io.Writer, p termenv.Profile, rules StylePrimitive, s string) {
if len(s) == 0 {
return
}
out := termenv.String(s)
if rules.Upper != nil && *rules.Upper {
out = termenv.String(strings.ToUpper(s))
}
if rules.Lower != nil && *rules.Lower {
out = termenv.String(strings.ToLower(s))
}
if rules.Title != nil && *rules.Title {
out = termenv.String(strings.Title(s))
}
if rules.Color != nil {
out = out.Foreground(p.Color(*rules.Color))
}
if rules.BackgroundColor != nil {
out = out.Background(p.Color(*rules.BackgroundColor))
}
if rules.Underline != nil && *rules.Underline {
out = out.Underline()
}
if rules.Bold != nil && *rules.Bold {
out = out.Bold()
}
if rules.Italic != nil && *rules.Italic {
out = out.Italic()
}
if rules.CrossedOut != nil && *rules.CrossedOut {
out = out.CrossOut()
}
if rules.Overlined != nil && *rules.Overlined {
out = out.Overline()
}
if rules.Inverse != nil && *rules.Inverse {
out = out.Reverse()
}
if rules.Blink != nil && *rules.Blink {
out = out.Blink()
}
_, _ = io.WriteString(w, out.String())
}
func (e *BaseElement) StyleOverrideRender(w io.Writer, ctx RenderContext, style StylePrimitive) error {
bs := ctx.blockStack
st1 := cascadeStylePrimitives(bs.Current().Style.StylePrimitive, style)
st2 := cascadeStylePrimitives(bs.With(e.Style), style)
return e.doRender(w, ctx.options.ColorProfile, st1, st2)
}
func (e *BaseElement) Render(w io.Writer, ctx RenderContext) error {
bs := ctx.blockStack
st1 := bs.Current().Style.StylePrimitive
st2 := bs.With(e.Style)
return e.doRender(w, ctx.options.ColorProfile, st1, st2)
}
func (e *BaseElement) doRender(w io.Writer, p termenv.Profile, st1, st2 StylePrimitive) error {
renderText(w, p, st1, e.Prefix)
defer func() {
renderText(w, p, st1, e.Suffix)
}()
// render unstyled prefix/suffix
renderText(w, p, st1, st2.BlockPrefix)
defer func() {
renderText(w, p, st1, st2.BlockSuffix)
}()
// render styled prefix/suffix
renderText(w, p, st2, st2.Prefix)
defer func() {
renderText(w, p, st2, st2.Suffix)
}()
s := e.Token
if len(st2.Format) > 0 {
var err error
s, err = formatToken(st2.Format, s)
if err != nil {
return err
}
}
renderText(w, p, st2, escapeReplacer.Replace(s))
return nil
}
// https://www.markdownguide.org/basic-syntax/#characters-you-can-escape
var escapeReplacer = strings.NewReplacer(
"\\\\", "\\",
"\\`", "`",
"\\*", "*",
"\\_", "_",
"\\{", "{",
"\\}", "}",
"\\[", "[",
"\\]", "]",
"\\<", "<",
"\\>", ">",
"\\(", "(",
"\\)", ")",
"\\#", "#",
"\\+", "+",
"\\-", "-",
"\\.", ".",
"\\!", "!",
"\\|", "|",
)
|
