646 lines
20 KiB
Go
646 lines
20 KiB
Go
package tview
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import (
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"fmt"
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"math"
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"regexp"
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"strconv"
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"strings"
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"unicode"
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"maunium.net/go/tcell"
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runewidth "github.com/mattn/go-runewidth"
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)
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// Text alignment within a box.
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const (
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AlignLeft = iota
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AlignCenter
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AlignRight
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)
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// Semigraphical runes.
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const (
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GraphicsHoriBar = '\u2500'
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GraphicsVertBar = '\u2502'
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GraphicsTopLeftCorner = '\u250c'
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GraphicsTopRightCorner = '\u2510'
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GraphicsBottomLeftCorner = '\u2514'
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GraphicsBottomRightCorner = '\u2518'
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GraphicsLeftT = '\u251c'
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GraphicsRightT = '\u2524'
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GraphicsTopT = '\u252c'
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GraphicsBottomT = '\u2534'
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GraphicsCross = '\u253c'
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GraphicsDbVertBar = '\u2550'
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GraphicsDbHorBar = '\u2551'
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GraphicsDbTopLeftCorner = '\u2554'
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GraphicsDbTopRightCorner = '\u2557'
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GraphicsDbBottomRightCorner = '\u255d'
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GraphicsDbBottomLeftCorner = '\u255a'
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GraphicsEllipsis = '\u2026'
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)
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// joints maps combinations of two graphical runes to the rune that results
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// when joining the two in the same screen cell. The keys of this map are
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// two-rune strings where the value of the first rune is lower than the value
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// of the second rune. Identical runes are not contained.
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var joints = map[string]rune{
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"\u2500\u2502": GraphicsCross,
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"\u2500\u250c": GraphicsTopT,
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"\u2500\u2510": GraphicsTopT,
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"\u2500\u2514": GraphicsBottomT,
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"\u2500\u2518": GraphicsBottomT,
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"\u2500\u251c": GraphicsCross,
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"\u2500\u2524": GraphicsCross,
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"\u2500\u252c": GraphicsTopT,
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"\u2500\u2534": GraphicsBottomT,
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"\u2500\u253c": GraphicsCross,
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"\u2502\u250c": GraphicsLeftT,
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"\u2502\u2510": GraphicsRightT,
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"\u2502\u2514": GraphicsLeftT,
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"\u2502\u2518": GraphicsRightT,
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"\u2502\u251c": GraphicsLeftT,
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"\u2502\u2524": GraphicsRightT,
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"\u2502\u252c": GraphicsCross,
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"\u2502\u2534": GraphicsCross,
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"\u2502\u253c": GraphicsCross,
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"\u250c\u2510": GraphicsTopT,
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"\u250c\u2514": GraphicsLeftT,
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"\u250c\u2518": GraphicsCross,
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"\u250c\u251c": GraphicsLeftT,
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"\u250c\u2524": GraphicsCross,
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"\u250c\u252c": GraphicsTopT,
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"\u250c\u2534": GraphicsCross,
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"\u250c\u253c": GraphicsCross,
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"\u2510\u2514": GraphicsCross,
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"\u2510\u2518": GraphicsRightT,
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"\u2510\u251c": GraphicsCross,
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"\u2510\u2524": GraphicsRightT,
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"\u2510\u252c": GraphicsTopT,
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"\u2510\u2534": GraphicsCross,
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"\u2510\u253c": GraphicsCross,
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"\u2514\u2518": GraphicsBottomT,
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"\u2514\u251c": GraphicsLeftT,
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"\u2514\u2524": GraphicsCross,
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"\u2514\u252c": GraphicsCross,
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"\u2514\u2534": GraphicsBottomT,
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"\u2514\u253c": GraphicsCross,
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"\u2518\u251c": GraphicsCross,
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"\u2518\u2524": GraphicsRightT,
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"\u2518\u252c": GraphicsCross,
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"\u2518\u2534": GraphicsBottomT,
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"\u2518\u253c": GraphicsCross,
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"\u251c\u2524": GraphicsCross,
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"\u251c\u252c": GraphicsCross,
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"\u251c\u2534": GraphicsCross,
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"\u251c\u253c": GraphicsCross,
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"\u2524\u252c": GraphicsCross,
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"\u2524\u2534": GraphicsCross,
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"\u2524\u253c": GraphicsCross,
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"\u252c\u2534": GraphicsCross,
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"\u252c\u253c": GraphicsCross,
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"\u2534\u253c": GraphicsCross,
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}
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// Common regular expressions.
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var (
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colorPattern = regexp.MustCompile(`\[([a-zA-Z]+|#[0-9a-zA-Z]{6}|\-)?(:([a-zA-Z]+|#[0-9a-zA-Z]{6}|\-)?(:([lbdru]+|\-)?)?)?\]`)
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regionPattern = regexp.MustCompile(`\["([a-zA-Z0-9_,;: \-\.]*)"\]`)
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escapePattern = regexp.MustCompile(`\[([a-zA-Z0-9_,;: \-\."#]+)\[(\[*)\]`)
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nonEscapePattern = regexp.MustCompile(`(\[[a-zA-Z0-9_,;: \-\."#]+\[*)\]`)
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boundaryPattern = regexp.MustCompile("([[:punct:]]\\s*|\\s+)")
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spacePattern = regexp.MustCompile(`\s+`)
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)
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// Positions of substrings in regular expressions.
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const (
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colorForegroundPos = 1
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colorBackgroundPos = 3
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colorFlagPos = 5
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)
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// Predefined InputField acceptance functions.
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var (
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// InputFieldInteger accepts integers.
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InputFieldInteger func(text string, ch rune) bool
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// InputFieldFloat accepts floating-point numbers.
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InputFieldFloat func(text string, ch rune) bool
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// InputFieldMaxLength returns an input field accept handler which accepts
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// input strings up to a given length. Use it like this:
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//
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// inputField.SetAcceptanceFunc(InputFieldMaxLength(10)) // Accept up to 10 characters.
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InputFieldMaxLength func(maxLength int) func(text string, ch rune) bool
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)
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// Package initialization.
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func init() {
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// Initialize the predefined input field handlers.
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InputFieldInteger = func(text string, ch rune) bool {
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if text == "-" {
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return true
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}
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_, err := strconv.Atoi(text)
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return err == nil
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}
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InputFieldFloat = func(text string, ch rune) bool {
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if text == "-" || text == "." || text == "-." {
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return true
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}
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_, err := strconv.ParseFloat(text, 64)
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return err == nil
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}
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InputFieldMaxLength = func(maxLength int) func(text string, ch rune) bool {
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return func(text string, ch rune) bool {
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return len([]rune(text)) <= maxLength
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}
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}
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}
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// styleFromTag takes the given style, defined by a foreground color (fgColor),
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// a background color (bgColor), and style attributes, and modifies it based on
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// the substrings (tagSubstrings) extracted by the regular expression for color
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// tags. The new colors and attributes are returned where empty strings mean
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// "don't modify" and a dash ("-") means "reset to default".
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func styleFromTag(fgColor, bgColor, attributes string, tagSubstrings []string) (newFgColor, newBgColor, newAttributes string) {
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if tagSubstrings[colorForegroundPos] != "" {
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color := tagSubstrings[colorForegroundPos]
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if color == "-" {
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fgColor = "-"
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} else if color != "" {
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fgColor = color
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}
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}
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if tagSubstrings[colorBackgroundPos-1] != "" {
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color := tagSubstrings[colorBackgroundPos]
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if color == "-" {
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bgColor = "-"
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} else if color != "" {
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bgColor = color
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}
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}
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if tagSubstrings[colorFlagPos-1] != "" {
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flags := tagSubstrings[colorFlagPos]
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if flags == "-" {
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attributes = "-"
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} else if flags != "" {
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attributes = flags
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}
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}
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return fgColor, bgColor, attributes
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}
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// overlayStyle mixes a background color with a foreground color (fgColor),
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// a (possibly new) background color (bgColor), and style attributes, and
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// returns the resulting style. For a definition of the colors and attributes,
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// see styleFromTag(). Reset instructions cause the corresponding part of the
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// default style to be used.
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func overlayStyle(background tcell.Color, defaultStyle tcell.Style, fgColor, bgColor, attributes string) tcell.Style {
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defFg, defBg, defAttr := defaultStyle.Decompose()
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style := defaultStyle.Background(background)
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if fgColor == "-" {
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style = style.Foreground(defFg)
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} else if fgColor != "" {
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style = style.Foreground(tcell.GetColor(fgColor))
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}
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if bgColor == "-" {
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style = style.Background(defBg)
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} else if bgColor != "" {
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style = style.Background(tcell.GetColor(bgColor))
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}
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if attributes == "-" {
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style = style.Bold(defAttr&tcell.AttrBold > 0)
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style = style.Blink(defAttr&tcell.AttrBlink > 0)
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style = style.Reverse(defAttr&tcell.AttrReverse > 0)
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style = style.Underline(defAttr&tcell.AttrUnderline > 0)
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style = style.Dim(defAttr&tcell.AttrDim > 0)
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} else if attributes != "" {
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style = style.Normal()
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for _, flag := range attributes {
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switch flag {
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case 'l':
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style = style.Blink(true)
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case 'b':
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style = style.Bold(true)
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case 'd':
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style = style.Dim(true)
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case 'r':
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style = style.Reverse(true)
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case 'u':
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style = style.Underline(true)
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}
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}
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}
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return style
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}
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// decomposeString returns information about a string which may contain color
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// tags. It returns the indices of the color tags (as returned by
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// re.FindAllStringIndex()), the color tags themselves (as returned by
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// re.FindAllStringSubmatch()), the indices of an escaped tags, the string
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// stripped by any color tags and escaped, and the screen width of the stripped
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// string.
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func decomposeString(text string) (colorIndices [][]int, colors [][]string, escapeIndices [][]int, stripped string, width int) {
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// Get positions of color and escape tags.
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colorIndices = colorPattern.FindAllStringIndex(text, -1)
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colors = colorPattern.FindAllStringSubmatch(text, -1)
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escapeIndices = escapePattern.FindAllStringIndex(text, -1)
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// Because the color pattern detects empty tags, we need to filter them out.
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for i := len(colorIndices) - 1; i >= 0; i-- {
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if colorIndices[i][1]-colorIndices[i][0] == 2 {
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colorIndices = append(colorIndices[:i], colorIndices[i+1:]...)
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colors = append(colors[:i], colors[i+1:]...)
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}
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}
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// Remove the color tags from the original string.
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var from int
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buf := make([]byte, 0, len(text))
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for _, indices := range colorIndices {
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buf = append(buf, []byte(text[from:indices[0]])...)
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from = indices[1]
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}
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buf = append(buf, text[from:]...)
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// Escape string.
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stripped = string(escapePattern.ReplaceAll(buf, []byte("[$1$2]")))
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// Get the width of the stripped string.
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width = runewidth.StringWidth(stripped)
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return
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}
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// Print prints text onto the screen into the given box at (x,y,maxWidth,1),
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// not exceeding that box. "align" is one of AlignLeft, AlignCenter, or
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// AlignRight. The screen's background color will not be changed.
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//
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// You can change the colors and text styles mid-text by inserting a color tag.
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// See the package description for details.
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//
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// Returns the number of actual runes printed (not including color tags) and the
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// actual width used for the printed runes.
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func Print(screen tcell.Screen, text string, x, y, maxWidth, align int, color tcell.Color) (int, int) {
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return printWithStyle(screen, text, x, y, maxWidth, align, tcell.StyleDefault.Foreground(color))
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}
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// printWithStyle works like Print() but it takes a style instead of just a
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// foreground color.
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func printWithStyle(screen tcell.Screen, text string, x, y, maxWidth, align int, style tcell.Style) (int, int) {
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if maxWidth <= 0 || len(text) == 0 {
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return 0, 0
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}
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// Decompose the text.
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colorIndices, colors, escapeIndices, strippedText, _ := decomposeString(text)
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// We deal with runes, not with bytes.
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runes := []rune(strippedText)
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// This helper function takes positions for a substring of "runes" and returns
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// a new string corresponding to this substring, making sure printing that
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// substring will observe color tags.
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substring := func(from, to int) string {
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var (
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colorPos, escapePos, runePos, startPos int
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foregroundColor, backgroundColor, attributes string
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)
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if from >= len(runes) {
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return ""
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}
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for pos := range text {
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// Handle color tags.
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if colorPos < len(colorIndices) && pos >= colorIndices[colorPos][0] && pos < colorIndices[colorPos][1] {
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if pos == colorIndices[colorPos][1]-1 {
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if runePos <= from {
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foregroundColor, backgroundColor, attributes = styleFromTag(foregroundColor, backgroundColor, attributes, colors[colorPos])
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}
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colorPos++
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}
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continue
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}
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// Handle escape tags.
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if escapePos < len(escapeIndices) && pos >= escapeIndices[escapePos][0] && pos < escapeIndices[escapePos][1] {
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if pos == escapeIndices[escapePos][1]-1 {
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escapePos++
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} else if pos == escapeIndices[escapePos][1]-2 {
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continue
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}
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}
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// Check boundaries.
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if runePos == from {
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startPos = pos
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} else if runePos >= to {
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return fmt.Sprintf(`[%s:%s:%s]%s`, foregroundColor, backgroundColor, attributes, text[startPos:pos])
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}
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runePos++
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}
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return fmt.Sprintf(`[%s:%s:%s]%s`, foregroundColor, backgroundColor, attributes, text[startPos:])
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}
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// We want to reduce everything to AlignLeft.
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if align == AlignRight {
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width := 0
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start := len(runes)
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for index := start - 1; index >= 0; index-- {
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w := runewidth.RuneWidth(runes[index])
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if width+w > maxWidth {
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break
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}
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width += w
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start = index
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}
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for start < len(runes) && runewidth.RuneWidth(runes[start]) == 0 {
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start++
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}
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return printWithStyle(screen, substring(start, len(runes)), x+maxWidth-width, y, width, AlignLeft, style)
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} else if align == AlignCenter {
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width := runewidth.StringWidth(strippedText)
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if width == maxWidth {
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// Use the exact space.
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return printWithStyle(screen, text, x, y, maxWidth, AlignLeft, style)
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} else if width < maxWidth {
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// We have more space than we need.
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half := (maxWidth - width) / 2
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return printWithStyle(screen, text, x+half, y, maxWidth-half, AlignLeft, style)
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} else {
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// Chop off runes until we have a perfect fit.
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var choppedLeft, choppedRight, leftIndex, rightIndex int
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rightIndex = len(runes) - 1
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for rightIndex > leftIndex && width-choppedLeft-choppedRight > maxWidth {
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if choppedLeft < choppedRight {
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leftWidth := runewidth.RuneWidth(runes[leftIndex])
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choppedLeft += leftWidth
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leftIndex++
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for leftIndex < len(runes) && leftIndex < rightIndex && runewidth.RuneWidth(runes[leftIndex]) == 0 {
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leftIndex++
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}
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} else {
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rightWidth := runewidth.RuneWidth(runes[rightIndex])
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choppedRight += rightWidth
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rightIndex--
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}
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}
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return printWithStyle(screen, substring(leftIndex, rightIndex), x, y, maxWidth, AlignLeft, style)
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}
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}
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// Draw text.
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drawn := 0
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drawnWidth := 0
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var (
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colorPos, escapePos int
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foregroundColor, backgroundColor, attributes string
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)
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runeSequence := make([]rune, 0, 10)
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runeSeqWidth := 0
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flush := func() {
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if len(runeSequence) == 0 {
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return // Nothing to flush.
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}
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// Print the rune sequence.
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finalX := x + drawnWidth
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_, _, finalStyle, _ := screen.GetContent(finalX, y)
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_, background, _ := finalStyle.Decompose()
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finalStyle = overlayStyle(background, style, foregroundColor, backgroundColor, attributes)
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var comb []rune
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if len(runeSequence) > 1 {
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// Allocate space for the combining characters only when necessary.
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comb = make([]rune, len(runeSequence)-1)
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copy(comb, runeSequence[1:])
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}
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for offset := 0; offset < runeSeqWidth; offset++ {
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// To avoid undesired effects, we place the same character in all cells.
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screen.SetContent(finalX+offset, y, runeSequence[0], comb, finalStyle)
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}
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// Advance and reset.
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drawn += len(runeSequence)
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drawnWidth += runeSeqWidth
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runeSequence = runeSequence[:0]
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runeSeqWidth = 0
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}
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for pos, ch := range text {
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// Handle color tags.
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if colorPos < len(colorIndices) && pos >= colorIndices[colorPos][0] && pos < colorIndices[colorPos][1] {
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flush()
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if pos == colorIndices[colorPos][1]-1 {
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foregroundColor, backgroundColor, attributes = styleFromTag(foregroundColor, backgroundColor, attributes, colors[colorPos])
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colorPos++
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}
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continue
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}
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// Handle escape tags.
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if escapePos < len(escapeIndices) && pos >= escapeIndices[escapePos][0] && pos < escapeIndices[escapePos][1] {
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flush()
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if pos == escapeIndices[escapePos][1]-1 {
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escapePos++
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} else if pos == escapeIndices[escapePos][1]-2 {
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continue
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}
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}
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// Check if we have enough space for this rune.
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chWidth := runewidth.RuneWidth(ch)
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if drawnWidth+chWidth > maxWidth {
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break // No. We're done then.
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}
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// Put this rune in the queue.
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if chWidth == 0 {
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// If this is not a modifier, we treat it as a space character.
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if len(runeSequence) == 0 {
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ch = ' '
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chWidth = 1
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}
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} else {
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// We have a character. Flush all previous runes.
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flush()
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}
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runeSequence = append(runeSequence, ch)
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runeSeqWidth += chWidth
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}
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if drawnWidth+runeSeqWidth <= maxWidth {
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flush()
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}
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return drawn, drawnWidth
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}
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// PrintSimple prints white text to the screen at the given position.
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func PrintSimple(screen tcell.Screen, text string, x, y int) {
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Print(screen, text, x, y, math.MaxInt32, AlignLeft, Styles.PrimaryTextColor)
|
|
}
|
|
|
|
// StringWidth returns the width of the given string needed to print it on
|
|
// screen. The text may contain color tags which are not counted.
|
|
func StringWidth(text string) int {
|
|
_, _, _, _, width := decomposeString(text)
|
|
return width
|
|
}
|
|
|
|
// WordWrap splits a text such that each resulting line does not exceed the
|
|
// given screen width. Possible split points are after any punctuation or
|
|
// whitespace. Whitespace after split points will be dropped.
|
|
//
|
|
// This function considers color tags to have no width.
|
|
//
|
|
// Text is always split at newline characters ('\n').
|
|
func WordWrap(text string, width int) (lines []string) {
|
|
colorTagIndices, _, escapeIndices, strippedText, _ := decomposeString(text)
|
|
|
|
// Find candidate breakpoints.
|
|
breakPoints := boundaryPattern.FindAllStringIndex(strippedText, -1)
|
|
|
|
// This helper function adds a new line to the result slice. The provided
|
|
// positions are in stripped index space.
|
|
addLine := func(from, to int) {
|
|
// Shift indices back to original index space.
|
|
var colorTagIndex, escapeIndex int
|
|
for colorTagIndex < len(colorTagIndices) && to >= colorTagIndices[colorTagIndex][0] ||
|
|
escapeIndex < len(escapeIndices) && to >= escapeIndices[escapeIndex][0] {
|
|
past := 0
|
|
if colorTagIndex < len(colorTagIndices) {
|
|
tagWidth := colorTagIndices[colorTagIndex][1] - colorTagIndices[colorTagIndex][0]
|
|
if colorTagIndices[colorTagIndex][0] < from {
|
|
from += tagWidth
|
|
to += tagWidth
|
|
colorTagIndex++
|
|
} else if colorTagIndices[colorTagIndex][0] < to {
|
|
to += tagWidth
|
|
colorTagIndex++
|
|
} else {
|
|
past++
|
|
}
|
|
} else {
|
|
past++
|
|
}
|
|
if escapeIndex < len(escapeIndices) {
|
|
tagWidth := escapeIndices[escapeIndex][1] - escapeIndices[escapeIndex][0]
|
|
if escapeIndices[escapeIndex][0] < from {
|
|
from += tagWidth
|
|
to += tagWidth
|
|
escapeIndex++
|
|
} else if escapeIndices[escapeIndex][0] < to {
|
|
to += tagWidth
|
|
escapeIndex++
|
|
} else {
|
|
past++
|
|
}
|
|
} else {
|
|
past++
|
|
}
|
|
if past == 2 {
|
|
break // All other indices are beyond the requested string.
|
|
}
|
|
}
|
|
lines = append(lines, text[from:to])
|
|
}
|
|
|
|
// Determine final breakpoints.
|
|
var start, lastEnd, newStart, breakPoint int
|
|
for {
|
|
// What's our candidate string?
|
|
var candidate string
|
|
if breakPoint < len(breakPoints) {
|
|
candidate = text[start:breakPoints[breakPoint][1]]
|
|
} else {
|
|
candidate = text[start:]
|
|
}
|
|
candidate = strings.TrimRightFunc(candidate, unicode.IsSpace)
|
|
|
|
if runewidth.StringWidth(candidate) >= width {
|
|
// We're past the available width.
|
|
if lastEnd > start {
|
|
// Use the previous candidate.
|
|
addLine(start, lastEnd)
|
|
start = newStart
|
|
} else {
|
|
// We have no previous candidate. Make a hard break.
|
|
var lineWidth int
|
|
for index, ch := range text {
|
|
if index < start {
|
|
continue
|
|
}
|
|
chWidth := runewidth.RuneWidth(ch)
|
|
if lineWidth > 0 && lineWidth+chWidth >= width {
|
|
addLine(start, index)
|
|
start = index
|
|
break
|
|
}
|
|
lineWidth += chWidth
|
|
}
|
|
}
|
|
} else {
|
|
// We haven't hit the right border yet.
|
|
if breakPoint >= len(breakPoints) {
|
|
// It's the last line. We're done.
|
|
if len(candidate) > 0 {
|
|
addLine(start, len(strippedText))
|
|
}
|
|
break
|
|
} else {
|
|
// We have a new candidate.
|
|
lastEnd = start + len(candidate)
|
|
newStart = breakPoints[breakPoint][1]
|
|
breakPoint++
|
|
}
|
|
}
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
// PrintJoinedBorder prints a border graphics rune into the screen at the given
|
|
// position with the given color, joining it with any existing border graphics
|
|
// rune. Background colors are preserved. At this point, only regular single
|
|
// line borders are supported.
|
|
func PrintJoinedBorder(screen tcell.Screen, x, y int, ch rune, color tcell.Color) {
|
|
previous, _, style, _ := screen.GetContent(x, y)
|
|
style = style.Foreground(color)
|
|
|
|
// What's the resulting rune?
|
|
var result rune
|
|
if ch == previous {
|
|
result = ch
|
|
} else {
|
|
if ch < previous {
|
|
previous, ch = ch, previous
|
|
}
|
|
result = joints[string(previous)+string(ch)]
|
|
}
|
|
if result == 0 {
|
|
result = ch
|
|
}
|
|
|
|
// We only print something if we have something.
|
|
screen.SetContent(x, y, result, nil, style)
|
|
}
|
|
|
|
// Escape escapes the given text such that color and/or region tags are not
|
|
// recognized and substituted by the print functions of this package. For
|
|
// example, to include a tag-like string in a box title or in a TextView:
|
|
//
|
|
// box.SetTitle(tview.Escape("[squarebrackets]"))
|
|
// fmt.Fprint(textView, tview.Escape(`["quoted"]`))
|
|
func Escape(text string) string {
|
|
return nonEscapePattern.ReplaceAllString(text, "$1[]")
|
|
}
|