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" Author: Takuya Fujiwara <tyru.exe@gmail.com>
" Description: swipl syntax / semantic check for Prolog files
call ale#Set('prolog_swipl_executable', 'swipl')
call ale#Set('prolog_swipl_load', 'current_prolog_flag(argv, [File]), load_files(File, [sandboxed(true)]), halt.')
call ale#Set('prolog_swipl_timeout', 3)
call ale#Set('prolog_swipl_alarm', 'alarm(%t, (%h), _, [])')
call ale#Set('prolog_swipl_alarm_handler', 'writeln(user_error, "ERROR: Exceeded %t seconds, Please change g:prolog_swipl_timeout to modify the limit."), halt(1)')
function! ale_linters#prolog#swipl#GetCommand(buffer) abort
let l:goals = ale#Var(a:buffer, 'prolog_swipl_load')
let l:goals = l:goals =~# '^\s*$' ? 'halt' : l:goals
let l:timeout = ale#Var(a:buffer, 'prolog_swipl_timeout') + 0
if l:timeout > 0
let l:goals = s:GetAlarm(a:buffer, l:timeout) . ', ' . l:goals
endif
return '%e -g ' . ale#Escape(l:goals) . ' -- %s'
endfunction
function! s:GetAlarm(buffer, timeout) abort
let l:handler = ale#Var(a:buffer, 'prolog_swipl_alarm_handler')
let l:handler = s:Subst(l:handler, {'t': a:timeout})
let l:alarm = ale#Var(a:buffer, 'prolog_swipl_alarm')
let l:alarm = s:Subst(l:alarm, {'t': a:timeout, 'h': l:handler})
return l:alarm
endfunction
function! s:Subst(format, vars) abort
let l:vars = extend(copy(a:vars), {'%': '%'})
return substitute(a:format, '%\(.\)', '\=get(l:vars, submatch(1), "")', 'g')
endfunction
function! ale_linters#prolog#swipl#Handle(buffer, lines) abort
let l:pattern = '\v^(ERROR|Warning)+%(:\s*[^:]+:(\d+)%(:(\d+))?)?:\s*(.*)$'
let l:output = []
let l:i = 0
while l:i < len(a:lines)
let l:match = matchlist(a:lines[l:i], l:pattern)
if empty(l:match)
let l:i += 1
continue
endif
let [l:i, l:text] = s:GetErrMsg(l:i, a:lines, l:match[4])
let l:item = {
\ 'lnum': (l:match[2] + 0 ? l:match[2] + 0 : 1),
\ 'col': l:match[3] + 0,
\ 'text': l:text,
\ 'type': (l:match[1] is# 'ERROR' ? 'E' : 'W'),
\}
if !s:Ignore(l:item)
call add(l:output, l:item)
endif
endwhile
return l:output
endfunction
" This returns [<next line number>, <error message string>]
function! s:GetErrMsg(i, lines, text) abort
if a:text !~# '^\s*$'
return [a:i + 1, a:text]
endif
let l:i = a:i + 1
let l:text = []
while l:i < len(a:lines) && a:lines[l:i] =~# '^\s'
call add(l:text, s:Trim(a:lines[l:i]))
let l:i += 1
endwhile
return [l:i, join(l:text, '. ')]
endfunction
function! s:Trim(str) abort
return substitute(a:str, '\v^\s+|\s+$', '', 'g')
endfunction
" Skip sandbox error which is caused by directives
" because what we want is syntactic or semantic check.
function! s:Ignore(item) abort
return a:item.type is# 'E'
\ && a:item.text =~# '\vNo permission to (call|directive|assert) sandboxed'
endfunction
call ale#linter#Define('prolog', {
\ 'name': 'swipl',
\ 'output_stream': 'stderr',
\ 'executable_callback': ale#VarFunc('prolog_swipl_executable'),
\ 'command_callback': 'ale_linters#prolog#swipl#GetCommand',
\ 'callback': 'ale_linters#prolog#swipl#Handle',
\})
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