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Include an updated vb indent script using vim9script. Also update the runtime indent test files Signed-off-by: Michael Soyka <mssr953@gmail.com> Signed-off-by: Christian Brabandt <cb@256bit.org>
193 lines
6.2 KiB
VimL
193 lines
6.2 KiB
VimL
vim9script
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# Vim indent file
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# Language: VisualBasic (ft=vb) / Basic (ft=basic) / SaxBasic (ft=vb)
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# Author: Johannes Zellner <johannes@zellner.org>
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# Maintainer: Michael Soyka (mssr953@gmail.com)
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# Contributors: Doug Kearns (dougkearns@gmail.com)
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# Last Change: Fri, 18 Jun 2004 07:22:42 CEST
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# Small update 2010 Jul 28 by Maxim Kim
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# 2022/12/15: add support for multiline statements.
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# 2022/12/21: move VbGetIndent from global to script-local scope
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# 2022/12/26: recognize "Type" keyword
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# 2023/07/13: correct/extend line continuation pattern (Doug Kearns)
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# 2023/07/14: add more keywords; various optimizations (Doug Kearns)
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# 2023/07/20: convert to Vim9 script
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# 2023/07/23: improve detection of preproc directives (Doug Kearns)
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if exists("b:did_indent")
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finish
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endif
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b:did_indent = v:true
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setlocal autoindent
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setlocal indentexpr=VbGetIndent()
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setlocal indentkeys&
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setlocal indentkeys+==~else,=~elseif,=~end,=~wend,=~case,=~next,=~select,=~loop
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b:undo_indent = "setlocal autoindent< indentexpr< indentkeys<"
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# Only define the function once.
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if exists("*VbGetIndent")
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finish
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endif
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# These regular expressions identify statement labels and preprocessor
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# directives.
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#
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const RE_LABEL: string = '^\s*\k\+:\s*$'
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const RE_PREPROC: string =
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'^\s*#\%(const\|if\|elseif\|else\|end\|region\|enable\|disable\)\>'
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# Microsoft documentation states that line continuation is indicated by a
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# two-character sequence at end-of-line: a space character followed by an
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# underscore. Nonetheless, it has been reported that additional
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# whitespace after the underscore is also allowed. We will support both.
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# However, VB 16.0 also permits a comment after the underscore which,
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# for simplicity, we do not support.
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#
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const RE_LINE_CONTINUATION: string = '\s_\s*$'
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# The following regular expressions are used to increase the indent
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# after statements that open a new scope.
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#
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const RE_INCR_INDENT_1: string =
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'^\s*\%(begin\|select\|case\|default\|if\|else\|elseif\|do\|for\|while\|with\)\>'
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const RE_INCR_INDENT_2: string =
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'^\s*\%(\%(private\|public\|friend\)\s\+\)\=\%(static\s\+\)\=\%(function\|sub\|property\)\>'
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const RE_INCR_INDENT_3: string =
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'^\s*\%(\%(private\|public\)\s\+\)\=\%(enum\|type\)\>'
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def VbGetIndent(): number
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var this_lnum: number = v:lnum
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var this_line: string = getline(this_lnum)
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var this_indent: number = 0
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# labels and preprocessor statements get zero indent immediately
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if (this_line =~? RE_LABEL) || (this_line =~? RE_PREPROC)
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return this_indent
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endif
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# Get the current value of 'shiftwidth'
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const SHIFTWIDTH: number = shiftwidth()
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# Find a non-blank line above the current line.
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# Skip over labels and preprocessor directives.
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var lnum: number = this_lnum
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var previous_line: string
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while lnum > 0
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lnum = prevnonblank(lnum - 1)
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previous_line = getline(lnum)
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if (previous_line !~? RE_LABEL) || (previous_line !~? RE_PREPROC)
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break
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endif
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endwhile
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# Hit the start of the file, use zero indent.
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if lnum == 0
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return this_indent
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endif
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# Variable "previous_line" now contains the text in buffer line "lnum".
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# Multi-line statements have the underscore character at end-of-line:
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#
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# object.method(arguments, _
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# arguments, _
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# arguments)
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#
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# and require extra logic to determine the correct indentation.
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#
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# Case 1: Line "lnum" is the first line of a multiline statement.
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# Line "lnum" will have a trailing underscore character
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# but the preceding non-blank line does not.
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# Line "this_lnum" will be indented relative to "lnum".
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#
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# Case 2: Line "lnum" is the last line of a multiline statement.
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# Line "lnum" will not have a trailing underscore character
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# but the preceding non-blank line will.
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# Line "this_lnum" will have the same indentation as the starting
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# line of the multiline statement.
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#
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# Case 3: Line "lnum" is neither the first nor last line.
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# Lines "lnum" and "lnum-1" will have a trailing underscore
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# character.
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# Line "this_lnum" will have the same indentation as the preceding
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# line.
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#
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# No matter which case it is, the starting line of the statement must be
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# found. It will be assumed that multiline statements cannot have
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# intermingled comments, statement labels, preprocessor directives or
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# blank lines.
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#
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var lnum_is_continued: bool = (previous_line =~? RE_LINE_CONTINUATION)
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var before_lnum: number
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var before_previous_line: string
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if lnum > 1
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before_lnum = prevnonblank(lnum - 1)
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before_previous_line = getline(before_lnum)
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else
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before_lnum = 0
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before_previous_line = ""
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endif
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if before_previous_line !~? RE_LINE_CONTINUATION
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# Variable "previous_line" contains the start of a statement.
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#
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this_indent = indent(lnum)
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if lnum_is_continued
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this_indent += SHIFTWIDTH
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endif
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elseif ! lnum_is_continued
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# Line "lnum" contains the last line of a multiline statement.
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# Need to find where this multiline statement begins
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#
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while before_lnum > 0
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before_lnum -= 1
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if getline(before_lnum) !~? RE_LINE_CONTINUATION
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before_lnum += 1
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break
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endif
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endwhile
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if before_lnum == 0
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before_lnum = 1
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endif
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previous_line = getline(before_lnum)
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this_indent = indent(before_lnum)
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else
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# Line "lnum" is not the first or last line of a multiline statement.
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#
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this_indent = indent(lnum)
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endif
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# Increment indent
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if (previous_line =~? RE_INCR_INDENT_1) ||
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(previous_line =~? RE_INCR_INDENT_2) ||
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(previous_line =~? RE_INCR_INDENT_3)
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this_indent += SHIFTWIDTH
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endif
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# Decrement indent
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if this_line =~? '^\s*end\s\+select\>'
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if previous_line !~? '^\s*select\>'
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this_indent -= 2 * SHIFTWIDTH
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else
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# this case is for an empty 'select' -- 'end select'
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# (w/o any case statements) like:
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#
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# select case readwrite
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# end select
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this_indent -= SHIFTWIDTH
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endif
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elseif this_line =~? '^\s*\%(end\|else\|elseif\|until\|loop\|next\|wend\)\>'
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this_indent -= SHIFTWIDTH
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elseif this_line =~? '^\s*\%(case\|default\)\>'
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if previous_line !~? '^\s*select\>'
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this_indent -= SHIFTWIDTH
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endif
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endif
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return this_indent
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enddef
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# vim:sw=4
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