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Diffstat (limited to 'vendor/github.com/gizak/termui/textbuilder.go')
-rw-r--r-- | vendor/github.com/gizak/termui/textbuilder.go | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/vendor/github.com/gizak/termui/textbuilder.go b/vendor/github.com/gizak/termui/textbuilder.go new file mode 100644 index 000000000..06a019bed --- /dev/null +++ b/vendor/github.com/gizak/termui/textbuilder.go @@ -0,0 +1,278 @@ +// Copyright 2016 Zack Guo <gizak@icloud.com>. All rights reserved. +// Use of this source code is governed by a MIT license that can +// be found in the LICENSE file. + +package termui + +import ( + "regexp" + "strings" + + "github.com/mitchellh/go-wordwrap" +) + +// TextBuilder is a minimal interface to produce text []Cell using specific syntax (markdown). +type TextBuilder interface { + Build(s string, fg, bg Attribute) []Cell +} + +// DefaultTxBuilder is set to be MarkdownTxBuilder. +var DefaultTxBuilder = NewMarkdownTxBuilder() + +// MarkdownTxBuilder implements TextBuilder interface, using markdown syntax. +type MarkdownTxBuilder struct { + baseFg Attribute + baseBg Attribute + plainTx []rune + markers []marker +} + +type marker struct { + st int + ed int + fg Attribute + bg Attribute +} + +var colorMap = map[string]Attribute{ + "red": ColorRed, + "blue": ColorBlue, + "black": ColorBlack, + "cyan": ColorCyan, + "yellow": ColorYellow, + "white": ColorWhite, + "default": ColorDefault, + "green": ColorGreen, + "magenta": ColorMagenta, +} + +var attrMap = map[string]Attribute{ + "bold": AttrBold, + "underline": AttrUnderline, + "reverse": AttrReverse, +} + +func rmSpc(s string) string { + reg := regexp.MustCompile(`\s+`) + return reg.ReplaceAllString(s, "") +} + +// readAttr translates strings like `fg-red,fg-bold,bg-white` to fg and bg Attribute +func (mtb MarkdownTxBuilder) readAttr(s string) (Attribute, Attribute) { + fg := mtb.baseFg + bg := mtb.baseBg + + updateAttr := func(a Attribute, attrs []string) Attribute { + for _, s := range attrs { + // replace the color + if c, ok := colorMap[s]; ok { + a &= 0xFF00 // erase clr 0 ~ 8 bits + a |= c // set clr + } + // add attrs + if c, ok := attrMap[s]; ok { + a |= c + } + } + return a + } + + ss := strings.Split(s, ",") + fgs := []string{} + bgs := []string{} + for _, v := range ss { + subs := strings.Split(v, "-") + if len(subs) > 1 { + if subs[0] == "fg" { + fgs = append(fgs, subs[1]) + } + if subs[0] == "bg" { + bgs = append(bgs, subs[1]) + } + } + } + + fg = updateAttr(fg, fgs) + bg = updateAttr(bg, bgs) + return fg, bg +} + +func (mtb *MarkdownTxBuilder) reset() { + mtb.plainTx = []rune{} + mtb.markers = []marker{} +} + +// parse streams and parses text into normalized text and render sequence. +func (mtb *MarkdownTxBuilder) parse(str string) { + rs := str2runes(str) + normTx := []rune{} + square := []rune{} + brackt := []rune{} + accSquare := false + accBrackt := false + cntSquare := 0 + + reset := func() { + square = []rune{} + brackt = []rune{} + accSquare = false + accBrackt = false + cntSquare = 0 + } + // pipe stacks into normTx and clear + rollback := func() { + normTx = append(normTx, square...) + normTx = append(normTx, brackt...) + reset() + } + // chop first and last + chop := func(s []rune) []rune { + return s[1 : len(s)-1] + } + + for i, r := range rs { + switch { + // stacking brackt + case accBrackt: + brackt = append(brackt, r) + if ')' == r { + fg, bg := mtb.readAttr(string(chop(brackt))) + st := len(normTx) + ed := len(normTx) + len(square) - 2 + mtb.markers = append(mtb.markers, marker{st, ed, fg, bg}) + normTx = append(normTx, chop(square)...) + reset() + } else if i+1 == len(rs) { + rollback() + } + // stacking square + case accSquare: + switch { + // squares closed and followed by a '(' + case cntSquare == 0 && '(' == r: + accBrackt = true + brackt = append(brackt, '(') + // squares closed but not followed by a '(' + case cntSquare == 0: + rollback() + if '[' == r { + accSquare = true + cntSquare = 1 + brackt = append(brackt, '[') + } else { + normTx = append(normTx, r) + } + // hit the end + case i+1 == len(rs): + square = append(square, r) + rollback() + case '[' == r: + cntSquare++ + square = append(square, '[') + case ']' == r: + cntSquare-- + square = append(square, ']') + // normal char + default: + square = append(square, r) + } + // stacking normTx + default: + if '[' == r { + accSquare = true + cntSquare = 1 + square = append(square, '[') + } else { + normTx = append(normTx, r) + } + } + } + + mtb.plainTx = normTx +} + +func wrapTx(cs []Cell, wl int) []Cell { + tmpCell := make([]Cell, len(cs)) + copy(tmpCell, cs) + + // get the plaintext + plain := CellsToStr(cs) + + // wrap + plainWrapped := wordwrap.WrapString(plain, uint(wl)) + + // find differences and insert + finalCell := tmpCell // finalcell will get the inserts and is what is returned + + plainRune := []rune(plain) + plainWrappedRune := []rune(plainWrapped) + trigger := "go" + plainRuneNew := plainRune + + for trigger != "stop" { + plainRune = plainRuneNew + for i := range plainRune { + if plainRune[i] == plainWrappedRune[i] { + trigger = "stop" + } else if plainRune[i] != plainWrappedRune[i] && plainWrappedRune[i] == 10 { + trigger = "go" + cell := Cell{10, 0, 0} + j := i - 0 + + // insert a cell into the []Cell in correct position + tmpCell[i] = cell + + // insert the newline into plain so we avoid indexing errors + plainRuneNew = append(plainRune, 10) + copy(plainRuneNew[j+1:], plainRuneNew[j:]) + plainRuneNew[j] = plainWrappedRune[j] + + // restart the inner for loop until plain and plain wrapped are + // the same; yeah, it's inefficient, but the text amounts + // should be small + break + + } else if plainRune[i] != plainWrappedRune[i] && + plainWrappedRune[i-1] == 10 && // if the prior rune is a newline + plainRune[i] == 32 { // and this rune is a space + trigger = "go" + // need to delete plainRune[i] because it gets rid of an extra + // space + plainRuneNew = append(plainRune[:i], plainRune[i+1:]...) + break + + } else { + trigger = "stop" // stops the outer for loop + } + } + } + + finalCell = tmpCell + + return finalCell +} + +// Build implements TextBuilder interface. +func (mtb MarkdownTxBuilder) Build(s string, fg, bg Attribute) []Cell { + mtb.baseFg = fg + mtb.baseBg = bg + mtb.reset() + mtb.parse(s) + cs := make([]Cell, len(mtb.plainTx)) + for i := range cs { + cs[i] = Cell{Ch: mtb.plainTx[i], Fg: fg, Bg: bg} + } + for _, mrk := range mtb.markers { + for i := mrk.st; i < mrk.ed; i++ { + cs[i].Fg = mrk.fg + cs[i].Bg = mrk.bg + } + } + + return cs +} + +// NewMarkdownTxBuilder returns a TextBuilder employing markdown syntax. +func NewMarkdownTxBuilder() TextBuilder { + return MarkdownTxBuilder{} +} |