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repl: readline line editing

This commit is contained in:
Henrixounez 2019-10-16 01:50:48 +02:00 committed by Alexander Medvednikov
parent 0e0f0ae5ea
commit 1956c6f906
5 changed files with 92 additions and 13 deletions

View File

@ -4,8 +4,11 @@
module compiler
import os
import term
import (
os
term
readline
)
struct Repl {
mut:
@ -81,22 +84,27 @@ pub fn run_repl() []string {
os.rm(temp_file.left(temp_file.len - 2))
}
mut r := Repl{}
mut readline := readline.Readline{}
vexe := os.args[0]
mut prompt := '>>> '
for {
if r.indent == 0 {
print('>>> ')
prompt = '>>> '
}
else {
print('... ')
prompt = '... '
}
r.line = os.get_raw_line()
if r.line.trim_space() == '' && r.line.ends_with('\n') {
continue
}
r.line = r.line.trim_space()
if r.line.len == -1 || r.line == '' || r.line == 'exit' {
mut line := readline.read_line(prompt) or {
break
}
if line.trim_space() == '' && line.ends_with('\n') {
continue
}
line = line.trim_space()
if line.len <= -1 || line == '' || line == 'exit' {
break
}
r.line = line
if r.line == '\n' {
continue
}

View File

@ -0,0 +1,66 @@
// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
// JS version
// Need to be implemented
// Will serve as more advanced input method
// Based on the work of https://github.com/AmokHuginnsson/replxx
module readline
import os
// Only use standard os.get_line
// Need implementation for readline capabilities
pub fn (r mut Readline) read_line_utf8(prompt string) ?ustring {
r.current = ''.ustring()
r.cursor = 0
r.prompt = prompt
r.search_index = 0
if r.previous_lines.len <= 1 {
r.previous_lines << ''.ustring()
r.previous_lines << ''.ustring()
}
else {
r.previous_lines[0] = ''.ustring()
}
print(r.prompt)
r.current = os.get_raw_line().ustring()
r.previous_lines[0] = ''.ustring()
r.search_index = 0
if r.current.s == '' {
return error('empty line')
}
return r.current
}
// Returns the string from the utf8 ustring
pub fn (r mut Readline) read_line(prompt string) ?string {
s := r.read_line_utf8(prompt) or {
return error(err)
}
return s.s
}
// Standalone function without persistent functionnalities (eg: history)
// Returns utf8 based ustring
pub fn read_line_utf8(prompt string) ?ustring {
mut r := Readline{}
s := r.read_line_utf8(prompt) or {
return error(err)
}
return s
}
// Standalone function without persistent functionnalities (eg: history)
// Return string from utf8 ustring
pub fn read_line(prompt string) ?string {
mut r := Readline{}
s := r.read_line(prompt) or {
return error(err)
}
return s
}

View File

@ -149,7 +149,7 @@ pub fn read_line(prompt string) ?string {
return s
}
fn (r Readline) analyse(c byte) Action {
fn (r Readline) analyse(c int) Action {
switch c {
case `\0`: return Action.eof
case 0x3 : return Action.eof // End of Text
@ -295,7 +295,9 @@ fn (r mut Readline) refresh_line() {
fn (r mut Readline) eof() bool {
r.previous_lines.insert(1, r.current)
r.cursor = r.current.len
if r.is_tty {
r.refresh_line()
}
return true
}
@ -337,8 +339,8 @@ fn (r mut Readline) commit_line() bool {
a := '\n'.ustring()
r.current = r.current + a
r.cursor = r.current.len
r.refresh_line()
if r.is_tty {
r.refresh_line()
println('')
}
return true

View File

@ -27,8 +27,11 @@ pub fn (r mut Readline) read_line_utf8(prompt string) ?ustring {
}
print(r.prompt)
r.current = os.get_line().ustring()
line := os.get_raw_line()
if line.len >= 0 {
r.current = line.ustring()
}
r.previous_lines[0] = ''.ustring()
r.search_index = 0
if r.current.s == '' {

View File

@ -27,7 +27,7 @@ pub fn (r mut Readline) read_line_utf8(prompt string) ?ustring {
}
print(r.prompt)
r.current = os.get_line().ustring()
r.current = os.get_raw_line().ustring()
r.previous_lines[0] = ''.ustring()
r.search_index = 0