diff options
Diffstat (limited to 'runtime/lua/vim/lsp/_snippet_grammar.lua')
| -rw-r--r-- | runtime/lua/vim/lsp/_snippet_grammar.lua | 48 |
1 files changed, 30 insertions, 18 deletions
diff --git a/runtime/lua/vim/lsp/_snippet_grammar.lua b/runtime/lua/vim/lsp/_snippet_grammar.lua index 86f00fea51..eb72efdf39 100644 --- a/runtime/lua/vim/lsp/_snippet_grammar.lua +++ b/runtime/lua/vim/lsp/_snippet_grammar.lua @@ -20,11 +20,15 @@ local format_capture = Cg(int / tonumber, 'capture') local format_modifier = Cg(P('upcase') + P('downcase') + P('capitalize'), 'modifier') local tabstop = Cg(int / tonumber, 'tabstop') +-- These characters are always escapable in text nodes no matter the context. +local escapable = '$}\\' + --- Returns a function that unescapes occurrences of "special" characters. --- ---- @param special string +--- @param special? string --- @return fun(match: string): string local function escape_text(special) + special = special or escapable return function(match) local escaped = match:gsub('\\(.)', function(c) return special:find(c) and c or '\\' .. c @@ -33,25 +37,33 @@ local function escape_text(special) end end --- Text nodes match "any character", but $, \, and } must be escaped. -local escapable = '$}\\' -local text = (backslash * S(escapable)) + (P(1) - S(escapable)) -local text_0, text_1 = (text ^ 0) / escape_text(escapable), text ^ 1 +--- Returns a pattern for text nodes. Will match characters in `escape` when preceded by a backslash, +--- and will stop with characters in `stop_with`. +--- +--- @param escape string +--- @param stop_with? string +--- @return vim.lpeg.Pattern +local function text(escape, stop_with) + stop_with = stop_with or escape + return (backslash * S(escape)) + (P(1) - S(stop_with)) +end + +-- For text nodes inside curly braces. It stops parsing when reaching an escapable character. +local braced_text = (text(escapable) ^ 0) / escape_text() + -- Within choice nodes, \ also escapes comma and pipe characters. -local choice_text = C(((backslash * S(escapable .. ',|')) + (P(1) - S(escapable .. ',|'))) ^ 1) - / escape_text(escapable .. ',|') -local if_text, else_text = Cg(text_0, 'if_text'), Cg(text_0, 'else_text') +local choice_text = C(text(escapable .. ',|') ^ 1) / escape_text(escapable .. ',|') + -- Within format nodes, make sure we stop at / -local format_text = C(((backslash * S(escapable)) + (P(1) - S(escapable .. '/'))) ^ 1) - / escape_text(escapable) +local format_text = C(text(escapable, escapable .. '/') ^ 1) / escape_text() + +local if_text, else_text = Cg(braced_text, 'if_text'), Cg(braced_text, 'else_text') + -- Within ternary condition format nodes, make sure we stop at : -local if_till_colon_text = Cg( - C(((backslash * S(escapable)) + (P(1) - S(escapable .. ':'))) ^ 1) / escape_text(escapable), - 'if_text' -) +local if_till_colon_text = Cg(C(text(escapable, escapable .. ':') ^ 1) / escape_text(), 'if_text') -- Matches the string inside //, allowing escaping of the closing slash. -local regex = Cg(((backslash * slash) + (P(1) - slash)) ^ 1, 'regex') +local regex = Cg(text('/') ^ 1, 'regex') -- Regex constructor flags (see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/RegExp#parameters). local options = Cg(S('dgimsuvy') ^ 0, 'options') @@ -94,11 +106,11 @@ local G = P({ snippet = Ct(Cg( Ct(( V('any') + - (Ct(Cg(text_1 / escape_text(escapable), 'text')) / node(Type.Text)) + (Ct(Cg((text(escapable, '$') ^ 1) / escape_text(), 'text')) / node(Type.Text)) ) ^ 1), 'children' - )) / node(Type.Snippet), - any_or_text = V('any') + (Ct(Cg(text_0 / escape_text(escapable), 'text')) / node(Type.Text)), + ) * -P(1)) / node(Type.Snippet), any = V('placeholder') + V('tabstop') + V('choice') + V('variable'), + any_or_text = V('any') + (Ct(Cg(braced_text, 'text')) / node(Type.Text)), tabstop = Ct(dollar * (tabstop + (l_brace * tabstop * r_brace))) / node(Type.Tabstop), placeholder = Ct(dollar * l_brace * tabstop * colon * Cg(V('any_or_text'), 'value') * r_brace) / node(Type.Placeholder), choice = Ct(dollar * |