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// SPDX-FileCopyrightText: Copyright 2024 Roland Csaszar
// SPDX-License-Identifier: MIT
//
// Project: go-gap-buffer
// File: example_test.go
// Date: 07.Feb.2024
//
// =============================================================================
package gapbuffer_test
import (
"fmt"
gap "github.com/Release-Candidate/go-gap-buffer"
)
func ExampleNew() {
// Create a new, empty gap buffer.
gapBuffer := gap.New()
// Print the content of the gap buffer as a single string.
fmt.Println(gapBuffer.String())
// Output:
}
func ExampleNewCap() {
// Create a new, empty gap buffer with a capacity of 10 bytes.
gapBuffer := gap.NewCap(10)
// Print the content size of the gap buffer in bytes.
fmt.Println(gapBuffer.Size())
// Output: 10
}
func ExampleNewStr() {
// Create a new gap buffer containing "Hello, World!".
gapBuffer := gap.NewStr("Hello, World!")
// Print the content of the gap buffer as a single string.
fmt.Println(gapBuffer.String())
// Output: Hello, World!
}
func ExampleNewStrCap() {
// Create a new gap buffer containing "Hello, World!" with a capacity of 10
// bytes.
// But "Hello, World!" is 13 bytes long, so the gap buffer's size will be
// grown.
gapBuffer := gap.NewStrCap("Hello, World!", 10)
// Print the content size of the gap buffer in bytes.
fmt.Println(gapBuffer.Size())
// Output: 26
}
func ExampleGapBuffer_Col() {
// Create a new gap buffer containing the two lines "Hello, World!" and
// "My name is 阿保昭則."
gapBuffer := gap.NewStr("Hello, World!\nMy name is 阿保昭則.")
// Get the current column position of the cursor in bytes.
// Numbering starts at column 1!
col := gapBuffer.Col()
// Print the current column position of the cursor in bytes, which is 24.
// The string "My name is 阿保昭則." is 24 bytes long, but contains 16 unicode
// runes.
fmt.Println(col)
// Output: 24
}
func ExampleGapBuffer_RuneCol() {
// Create a new gap buffer containing the two lines "Hello, World!" and
// "My name is 阿保昭則."
gapBuffer := gap.NewStr("Hello, World!\nMy name is 阿保昭則.")
// Get the current column position of the cursor in runes.
// Numbering starts at column 1!
runeCol := gapBuffer.RuneCol()
// Print the current column position of the cursor in runes, which is 16.
// The string "My name is 阿保昭則." is 24 bytes long, but contains 16 unicode
// runes.
fmt.Println(runeCol)
// Output: 16
}
func ExampleGapBuffer_UpMv() {
// Create a new gap buffer containing the two lines "Hello, World!" and
// "My name is John."
gapBuffer := gap.NewStr("Hello, World!\nMy name is John.")
// Move the cursor up one line.
gapBuffer.UpMv()
// Get the part of the buffer before - to the left - and after - to the
// right - of the current cursor position.
l, r := gapBuffer.StringPair()
// l should be "Hello, World!" and r should be "\nMy name is John."
fmt.Printf("left: '%s' |cursor| right: '%s'\n", l, r)
// Output: left: 'Hello, World!' |cursor| right: '
// My name is John.'
}
func ExampleGapBuffer_DownMv() {
// Create a new gap buffer containing the two lines "Hello, World!" and
// "My name is John."
gapBuffer := gap.NewStr("Hello, World!\nMy name is John.")
// Move the cursor up one line.
gapBuffer.UpMv()
// And move down again, we are were we started.
gapBuffer.DownMv()
// Get the part of the buffer before - to the left - and after - to the
// right - of the current cursor position.
l, r := gapBuffer.StringPair()
// l should be "Hello, World!\nMy name is John." and r should be empty.
fmt.Printf("left: '%s' |cursor| right: '%s'\n", l, r)
// Output: left: 'Hello, World!
// My name is John.' |cursor| right: ''
}
func ExampleGapBuffer_Insert() {
// Create a new gap buffer containing "Hello, World!".
gapBuffer := gap.NewStr("Hello, World!")
// Insert " My name is John." at the current position.
gapBuffer.Insert(" My name is John.")
// Print the content of the gap buffer as a single string.
fmt.Println(gapBuffer.String())
// Output: Hello, World! My name is John.
}
func ExampleGapBuffer_LeftDel() {
// Create a new gap buffer containing the two lines "Hello, World!" and
// "My name is John."
gapBuffer := gap.NewStr("Hello, World!\nMy name is John.")
// Delete 16 runes to the left of the cursor (like backspace).
gapBuffer.LeftDel()
gapBuffer.LeftDel()
gapBuffer.LeftDel()
gapBuffer.LeftDel()
gapBuffer.LeftDel()
gapBuffer.LeftDel()
gapBuffer.LeftDel()
gapBuffer.LeftDel()
gapBuffer.LeftDel()
gapBuffer.LeftDel()
gapBuffer.LeftDel()
gapBuffer.LeftDel()
gapBuffer.LeftDel()
gapBuffer.LeftDel()
gapBuffer.LeftDel()
gapBuffer.LeftDel()
// Print the content of the gap buffer as a single string.
fmt.Println(gapBuffer.String())
// Output: Hello, World!
}
func ExampleGapBuffer_LeftMv() {
// Create a new gap buffer containing the two lines "Hello, World!" and
// "My name is John."
gapBuffer := gap.NewStr("Hello, World!\nMy name is John.")
// Move 16 runes to the left of the cursor.
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
// Get the part of the buffer before - to the left - and after - to the
// right - of the current cursor position.
l, r := gapBuffer.StringPair()
// l should be "Hello, World!" and r should be '\nMy name is John.'.
fmt.Printf("left: '%s' |cursor| right: '%s'\n", l, r)
// Output: left: 'Hello, World!
// ' |cursor| right: 'My name is John.'
}
func ExampleGapBuffer_Line() {
// Create a new gap buffer containing the two lines "Hello, World!" and
// "My name is John."
gapBuffer := gap.NewStr("Hello, World!\nMy name is John.")
// Get the current line position of the cursor.
// Numbering starts at line 1!
line := gapBuffer.Line()
// Print the current line position of the cursor.
fmt.Println(line)
// Output: 2
}
func ExampleGapBuffer_LineCol() {
// Create a new gap buffer containing the two lines "Hello, World!" and
// "My name is 阿保昭則."
gapBuffer := gap.NewStr("Hello, World!\nMy name is 阿保昭則.")
// Get the current line and column position in bytes of the cursor.
// Numbering starts at line 1 and column 1!
line, col := gapBuffer.LineCol()
// Print the current line position of the cursor.
fmt.Printf("Line: %d column: %d", line, col)
// Output: Line: 2 column: 24
}
func ExampleGapBuffer_LineRuneCol() {
// Create a new gap buffer containing the two lines "Hello, World!" and
// "My name is 阿保昭則."
gapBuffer := gap.NewStr("Hello, World!\nMy name is 阿保昭則.")
// Get the current column position of the cursor in runes.
// Numbering starts at column 1!
line, col := gapBuffer.LineRuneCol()
// Print the current line position of the cursor.
fmt.Printf("Line: %d column: %d", line, col)
// Output: Line: 2 column: 16
}
func ExampleGapBuffer_LineLength() {
// Create a new gap buffer containing "Hello, Wôrld!"
gapBuffer := gap.NewStr("Hello, Wôrld!")
// Get the length of the current line in bytes.
length := gapBuffer.LineLength()
// Print the length of the current line in bytes.
// The string "Hello, Wôrld!" is 14 bytes long, but contains 13 unicode
// runes.
fmt.Println(length)
// Output: 14
}
func ExampleGapBuffer_RightMv() {
// Create a new gap buffer containing the two lines "Hello, World!" and
// "My name is John."
gapBuffer := gap.NewStr("Hello, World!\nMy name is John.")
// Move 16 runes to the left of the cursor.
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
// Move 8 runes to the right.
gapBuffer.RightMv()
gapBuffer.RightMv()
gapBuffer.RightMv()
gapBuffer.RightMv()
gapBuffer.RightMv()
gapBuffer.RightMv()
gapBuffer.RightMv()
gapBuffer.RightMv()
// Get the part of the buffer before - to the left - and after - to the
// right - of the current cursor position.
l, r := gapBuffer.StringPair()
// l should be "Hello, World!\nMy name " and r should be 'is John.'.
fmt.Printf("left: '%s' |cursor| right: '%s'\n", l, r)
// Output: left: 'Hello, World!
// My name ' |cursor| right: 'is John.'
}
func ExampleGapBuffer_RightDel() {
// Create a new gap buffer containing the two lines "Hello, World!" and
// "My name is John."
gapBuffer := gap.NewStr("Hello, World!\nMy name is John.")
// Move 5 runes to the left of the cursor.
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
// Delete 5 runes to the right, like the "delete" key does.
gapBuffer.RightDel()
gapBuffer.RightDel()
gapBuffer.RightDel()
gapBuffer.RightDel()
gapBuffer.RightDel()
// Get the part of the buffer before - to the left - and after - to the
// right - of the current cursor position.
l, r := gapBuffer.StringPair()
// l should be "Hello, World!\nMy name is" and r should be empty.
fmt.Printf("left: '%s' |cursor| right: '%s'\n", l, r)
// Output: left: 'Hello, World!
// My name is ' |cursor| right: ''
}
func ExampleGapBuffer_Size() {
// Create a new gap buffer containing the two lines "Hello, World!" and
// "My name is 阿保昭則."
gapBuffer := gap.NewStr("Hello, World!\nMy name is 阿保昭則.")
// Get the current size in bytes of the gap buffer.
// This includes (unused bytes in) the gap
size := gapBuffer.Size()
// Print the current line position of the cursor.
fmt.Println(size)
// Output: 1024
}
func ExampleGapBuffer_String() {
// Create a new gap buffer containing "Hello, World!".
gapBuffer := gap.NewStr("Hello, World!")
// Print the content of the gap buffer as a single string.
fmt.Println(gapBuffer.String())
// Output: Hello, World!
}
func ExampleGapBuffer_StringLength() {
// Create a new gap buffer containing "Hello, World!".
gapBuffer := gap.NewStr("Hello, World!")
// Get the length of the content of the gap buffer in bytes.
length := gapBuffer.StringLength()
// Print the length of the content of the gap buffer in bytes.
fmt.Println(length)
// Output: 13
}
func ExampleGapBuffer_StringPair() {
// Create a new gap buffer containing the two lines "Hello, World!" and
// "My name is John."
gapBuffer := gap.NewStr("Hello, World!\nMy name is John.")
// Move 16 runes to the left of the cursor.
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
gapBuffer.LeftMv()
// Get the part of the buffer before - to the left - and after - to the
// right - of the current cursor position.
l, r := gapBuffer.StringPair()
// l should be "Hello, World!" and r should be '\nMy name is John.'.
fmt.Printf("left: '%s' |cursor| right: '%s'\n", l, r)
// Output: left: 'Hello, World!
// ' |cursor| right: 'My name is John.'
}