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e786777410
Each set of options applies to a range of characters equal to the length
of the text added.
E.g. on write calls like:
Write("text", opts1)
Write("long text", opts2)
The two passed options will be stored as:
opts1 for byte range low:0, high:4
opts2 for byte range low:4, high:13
The text itself will be stored in a bytes.Buffer.
104 lines
2.2 KiB
Go
104 lines
2.2 KiB
Go
package text
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// write_options.go contains options used when writing content to the Text widget.
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import (
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"sort"
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"github.com/mum4k/termdash/cell"
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)
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// WriteOption is used to provide options to Write().
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type WriteOption interface {
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// set sets the provided option.
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set(*writeOptions)
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}
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// writeOptions stores the provided options.
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type writeOptions struct {
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cellOpts *cell.Options
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}
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// newWriteOptions returns new writeOptions instance.
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func newWriteOptions(wOpts ...WriteOption) *writeOptions {
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wo := &writeOptions{
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cellOpts: cell.NewOptions(),
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}
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for _, o := range wOpts {
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o.set(wo)
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}
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return wo
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}
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// writeOption implements WriteOption.
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type writeOption func(*writeOptions)
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// set implements WriteOption.set.
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func (wo writeOption) set(wOpts *writeOptions) {
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wo(wOpts)
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}
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// WriteCellOpts sets options on the cells that contain the text.
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func WriteCellOpts(opts ...cell.Option) WriteOption {
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return writeOption(func(wOpts *writeOptions) {
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wOpts.cellOpts = cell.NewOptions(opts...)
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})
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}
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// optsRange are write options that apply to a range of bytes in the text.
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type optsRange struct {
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// low is the first byte where these options apply.
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low int
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// high is the end of the range. The opts apply to all bytes in range low
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// <= b < high.
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high int
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// opts are the options provided at a call to Write().
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opts *writeOptions
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}
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// newOptsRange returns a new optsRange.
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func newOptsRange(low, high int, opts *writeOptions) *optsRange {
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return &optsRange{
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low: low,
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high: high,
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opts: opts,
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}
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}
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// givenWOpts stores the write options provided on all the calls to Write().
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// The options are keyed by their low indices.
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type givenWOpts map[int]*optsRange
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// newGivenWOpts returns a new givenWOpts instance.
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func newGivenWOpts() givenWOpts {
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return givenWOpts{}
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}
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// forPosition returns write options that apply to character at the specified
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// byte position.
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func (g givenWOpts) forPosition(pos int) *optsRange {
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if or, ok := g[pos]; ok {
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return or
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}
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var keys []int
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for k := range g {
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keys = append(keys, k)
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}
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sort.Ints(keys)
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res := newOptsRange(0, 0, newWriteOptions())
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for _, k := range keys {
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or := g[k]
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if or.low > pos {
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break
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}
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if or.high > pos {
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res = or
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}
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}
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return res
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}
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