• Péter Szilágyi's avatar
    Godeps, vendor: convert dependency management to trash (#3198) · 289b3071
    Péter Szilágyi authored
    This commit converts the dependency management from Godeps to the vendor
    folder, also switching the tool from godep to trash. Since the upstream tool
    lacks a few features proposed via a few PRs, until those PRs are merged in
    (if), use github.com/karalabe/trash.
    
    You can update dependencies via trash --update.
    
    All dependencies have been updated to their latest version.
    
    Parts of the build system are reworked to drop old notions of Godeps and
    invocation of the go vet command so that it doesn't run against the vendor
    folder, as that will just blow up during vetting.
    
    The conversion drops OpenCL (and hence GPU mining support) from ethash and our
    codebase. The short reasoning is that there's noone to maintain and having
    opencl libs in our deps messes up builds as go install ./... tries to build
    them, failing with unsatisfied link errors for the C OpenCL deps.
    
    golang.org/x/net/context is not vendored in. We expect it to be fetched by the
    user (i.e. using go get). To keep ci.go builds reproducible the package is
    "vendored" in build/_vendor.
    289b3071
textbuilder.go 6.15 KB
// 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{}
}