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" Vim indent file
" Language: SAS
" Maintainer: Zhen-Huan Hu <wildkeny@gmail.com>
" Version: 3.0.3
" Last Change: Jun 26, 2018
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
setlocal indentexpr=GetSASIndent()
setlocal indentkeys+=;,=~data,=~proc,=~macro
if exists("*GetSASIndent")
finish
endif
let s:cpo_save = &cpo
set cpo&vim
" Regex that captures the start of a data/proc section
let s:section_str = '\v%(^|;)\s*%(data|proc)>'
" Regex that captures the end of a run-processing section
let s:section_run = '\v%(^|;)\s*run\s*;'
" Regex that captures the end of a data/proc section
let s:section_end = '\v%(^|;)\s*%(quit|enddata)\s*;'
" Regex that captures the start of a control block (anything inside a section)
let s:block_str = '\v<%(do>%([^;]+<%(to|over|while)>[^;]+)=|%(compute|define\s+%(column|footer|header|style|table|tagset|crosstabs|statgraph)|edit|layout|method|select)>[^;]+|begingraph)\s*;'
" Regex that captures the end of a control block (anything inside a section)
let s:block_end = '\v<%(end|endcomp|endlayout|endgraph)\s*;'
" Regex that captures the start of a macro
let s:macro_str = '\v%(^|;)\s*\%macro>'
" Regex that captures the end of a macro
let s:macro_end = '\v%(^|;)\s*\%mend\s*;'
" Regex that defines the end of the program
let s:program_end = '\v%(^|;)\s*endsas\s*;'
" List of procs supporting run-processing
let s:run_processing_procs = [
\ 'catalog', 'chart', 'datasets', 'document', 'ds2', 'plot', 'sql',
\ 'gareabar', 'gbarline', 'gchart', 'gkpi', 'gmap', 'gplot', 'gradar', 'greplay', 'gslide', 'gtile',
\ 'anova', 'arima', 'catmod', 'factex', 'glm', 'model', 'optex', 'plan', 'reg',
\ 'iml',
\ ]
" Find the line number of previous keyword defined by the regex
function! s:PrevMatch(lnum, regex)
let prev_lnum = prevnonblank(a:lnum - 1)
while prev_lnum > 0
let prev_line = getline(prev_lnum)
if prev_line =~? a:regex
break
else
let prev_lnum = prevnonblank(prev_lnum - 1)
endif
endwhile
return prev_lnum
endfunction
" Main function
function! GetSASIndent()
let prev_lnum = prevnonblank(v:lnum - 1)
if prev_lnum ==# 0
" Leave the indentation of the first line unchanged
return indent(1)
else
let prev_line = getline(prev_lnum)
" Previous non-blank line contains the start of a macro/section/block
" while not the end of a macro/section/block (at the same line)
if (prev_line =~? s:section_str && prev_line !~? s:section_run && prev_line !~? s:section_end) ||
\ (prev_line =~? s:block_str && prev_line !~? s:block_end) ||
\ (prev_line =~? s:macro_str && prev_line !~? s:macro_end)
let ind = indent(prev_lnum) + shiftwidth()
elseif prev_line =~? s:section_run && prev_line !~? s:section_end
let prev_section_str_lnum = s:PrevMatch(v:lnum, s:section_str)
let prev_section_end_lnum = max([
\ s:PrevMatch(v:lnum, s:section_end),
\ s:PrevMatch(v:lnum, s:macro_end ),
\ s:PrevMatch(v:lnum, s:program_end)])
" Check if the section supports run-processing
if prev_section_end_lnum < prev_section_str_lnum &&
\ getline(prev_section_str_lnum) =~? '\v%(^|;)\s*proc\s+%(' .
\ join(s:run_processing_procs, '|') . ')>'
let ind = indent(prev_lnum) + shiftwidth()
else
let ind = indent(prev_lnum)
endif
else
let ind = indent(prev_lnum)
endif
endif
" Re-adjustments based on the inputs of the current line
let curr_line = getline(v:lnum)
if curr_line =~? s:program_end
" End of the program
" Same indentation as the first non-blank line
return indent(nextnonblank(1))
elseif curr_line =~? s:macro_end
" Current line is the end of a macro
" Match the indentation of the start of the macro
return indent(s:PrevMatch(v:lnum, s:macro_str))
elseif curr_line =~? s:block_end && curr_line !~? s:block_str
" Re-adjust if current line is the end of a block
" while not the beginning of a block (at the same line)
" Returning the indent of previous block start directly
" would not work due to nesting
let ind = ind - shiftwidth()
elseif curr_line =~? s:section_str || curr_line =~? s:section_run || curr_line =~? s:section_end
" Re-adjust if current line is the start/end of a section
" since the end of a section could be inexplicit
let prev_section_str_lnum = s:PrevMatch(v:lnum, s:section_str)
" Check if the previous section supports run-processing
if getline(prev_section_str_lnum) =~? '\v%(^|;)\s*proc\s+%(' .
\ join(s:run_processing_procs, '|') . ')>'
let prev_section_end_lnum = max([
\ s:PrevMatch(v:lnum, s:section_end),
\ s:PrevMatch(v:lnum, s:macro_end ),
\ s:PrevMatch(v:lnum, s:program_end)])
else
let prev_section_end_lnum = max([
\ s:PrevMatch(v:lnum, s:section_end),
\ s:PrevMatch(v:lnum, s:section_run),
\ s:PrevMatch(v:lnum, s:macro_end ),
\ s:PrevMatch(v:lnum, s:program_end)])
endif
if prev_section_end_lnum < prev_section_str_lnum
let ind = ind - shiftwidth()
endif
endif
return ind
endfunction
let &cpo = s:cpo_save
unlet s:cpo_save
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