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(* Module: Build Generic functions to build lenses Author: Raphael Pinson <raphink@gmail.com> About: License This file is licensed under the LGPL v2+, like the rest of Augeas. About: Reference This file provides generic functions to build Augeas lenses *) module Build = let eol = Util.eol (************************************************************************ * Group: GENERIC CONSTRUCTIONS ************************************************************************) (************************************************************************ * View: brackets * Put a lens inside brackets * * Parameters: * l:lens - the left bracket lens * r: lens - the right bracket lens * lns:lens - the lens to put inside brackets ************************************************************************) let brackets (l:lens) (r:lens) (lns:lens) = l . lns . r (************************************************************************ * Group: LIST CONSTRUCTIONS ************************************************************************) (************************************************************************ * View: list * Build a list of identical lenses separated with a given separator * (at least 2 elements) * * Parameters: * lns:lens - the lens to repeat in the list * sep:lens - the separator lens, which can be taken from the <Sep> module ************************************************************************) let list (lns:lens) (sep:lens) = lns . ( sep . lns )+ (************************************************************************ * View: opt_list * Same as <list>, but there might be only one element in the list * * Parameters: * lns:lens - the lens to repeat in the list * sep:lens - the separator lens, which can be taken from the <Sep> module ************************************************************************) let opt_list (lns:lens) (sep:lens) = lns . ( sep . lns )* (************************************************************************ * Group: LABEL OPERATIONS ************************************************************************) (************************************************************************ * View: xchg * Replace a pattern with a different label in the tree, * thus emulating a key but allowing to replace the keyword * with a different value than matched * * Parameters: * m:regexp - the pattern to match * d:string - the default value when a node in created * l:string - the label to apply for such nodes ************************************************************************) let xchg (m:regexp) (d:string) (l:string) = del m d . label l (************************************************************************ * View: xchgs * Same as <xchg>, but the pattern is the default string * * Parameters: * m:string - the string to replace, also used as default * l:string - the label to apply for such nodes ************************************************************************) let xchgs (m:string) (l:string) = xchg m m l (************************************************************************ * Group: SUBNODE CONSTRUCTIONS ************************************************************************) (************************************************************************ * View: key_value_line * A subnode with a keyword, a separator and a storing lens, * and an end of line * * Parameters: * kw:regexp - the pattern to match as key * sep:lens - the separator lens, which can be taken from the <Sep> module * sto:lens - the storing lens ************************************************************************) let key_value_line (kw:regexp) (sep:lens) (sto:lens) = [ key kw . sep . sto . eol ] (************************************************************************ * View: key_value_line_comment * Same as <key_value_line>, but allows to have a comment in the end of a line * and an end of line * * Parameters: * kw:regexp - the pattern to match as key * sep:lens - the separator lens, which can be taken from the <Sep> module * sto:lens - the storing lens * comment:lens - the comment lens, which can be taken from <Util> ************************************************************************) let key_value_line_comment (kw:regexp) (sep:lens) (sto:lens) (comment:lens) = [ key kw . sep . sto . (eol|comment) ] (************************************************************************ * View: key_value * Same as <key_value_line>, but does not end with an end of line * * Parameters: * kw:regexp - the pattern to match as key * sep:lens - the separator lens, which can be taken from the <Sep> module * sto:lens - the storing lens ************************************************************************) let key_value (kw: regexp) (sep:lens) (sto:lens) = [ key kw . sep . sto ] (************************************************************************ * View: key_ws_value * * Store a key/value pair where key and value are separated by whitespace * and the value goes to the end of the line. Leading and trailing * whitespace is stripped from the value. The end of line is consumed by * this lens * * Parameters: * kw:regexp - the pattern to match as key ************************************************************************) let key_ws_value (kw:regexp) = key_value_line kw Util.del_ws_spc (store Rx.space_in) (************************************************************************ * View: flag * A simple flag subnode, consisting of a single key * * Parameters: * kw:regexp - the pattern to match as key ************************************************************************) let flag (kw:regexp) = [ key kw ] (************************************************************************ * View: flag_line * A simple flag line, consisting of a single key * * Parameters: * kw:regexp - the pattern to match as key ************************************************************************) let flag_line (kw:regexp) = [ key kw . eol ] (************************************************************************ * Group: BLOCK CONSTRUCTIONS ************************************************************************) (************************************************************************ * View: block_generic * A block enclosed in brackets * * Parameters: * entry:lens - the entry to be stored inside the block. * This entry should include <Util.empty> * or its equivalent if necessary. * entry_noindent:lens - the entry to be stored inside the block, * without indentation. * This entry should not include <Util.empty> * entry_noeol:lens - the entry to be stored inside the block, * without eol. * This entry should not include <Util.empty> * entry_noindent_noeol:lens - the entry to be stored inside the block, * without indentation or eol. * This entry should not include <Util.empty> * comment:lens - the comment lens used in the block * comment_noindent:lens - the comment lens used in the block, * without indentation. * ldelim_re:regexp - regexp for the left delimiter * rdelim_re:regexp - regexp for the right delimiter * ldelim_default:string - default value for the left delimiter * rdelim_default:string - default value for the right delimiter ************************************************************************) let block_generic (entry:lens) (entry_noindent:lens) (entry_noeol:lens) (entry_noindent_noeol:lens) (comment:lens) (comment_noindent:lens) (ldelim_re:regexp) (rdelim_re:regexp) (ldelim_default:string) (rdelim_default:string) = let block_single = entry_noindent_noeol | comment_noindent in let block_start = entry_noindent | comment_noindent in let block_middle = (entry | comment)* in let block_end = entry_noeol | comment in del ldelim_re ldelim_default . ( ( block_start . block_middle . block_end ) | block_single ) . del rdelim_re rdelim_default (************************************************************************ * View: block_setdefault * A block enclosed in brackets * * Parameters: * entry:lens - the entry to be stored inside the block. * This entry should not include <Util.empty>, * <Util.comment> or <Util.comment_noindent>, * should not be indented or finish with an eol. * ldelim_re:regexp - regexp for the left delimiter * rdelim_re:regexp - regexp for the left delimiter * ldelim_default:string - default value for the left delimiter * rdelim_default:string - default value for the right delimiter ************************************************************************) let block_setdelim (entry:lens) (ldelim_re:regexp) (rdelim_re:regexp) (ldelim_default:string) (rdelim_default:string) = block_generic (Util.empty | Util.indent . entry . eol) (entry . eol) (Util.indent . entry) entry Util.comment Util.comment_noindent ldelim_re rdelim_re ldelim_default rdelim_default (* Variable: block_ldelim_re *) let block_ldelim_re = /[ \t\n]+\{[ \t\n]*/ (* Variable: block_rdelim_re *) let block_rdelim_re = /[ \t\n]*\}/ (* Variable: block_ldelim_default *) let block_ldelim_default = " {\n" (* Variable: block_rdelim_default *) let block_rdelim_default = "}" (************************************************************************ * View: block * A block enclosed in brackets * * Parameters: * entry:lens - the entry to be stored inside the block. * This entry should not include <Util.empty>, * <Util.comment> or <Util.comment_noindent>, * should not be indented or finish with an eol. ************************************************************************) let block (entry:lens) = block_setdelim entry block_ldelim_re block_rdelim_re block_ldelim_default block_rdelim_default (* Variable: block_ldelim_newlines_re *) let block_ldelim_newlines_re = /[ \t\n]*\{([ \t\n]*\n)?/ (* Variable: block_rdelim_newlines_re *) let block_rdelim_newlines_re = /[ \t]*\}/ (* Variable: block_ldelim_newlines_default *) let block_ldelim_newlines_default = "\n{\n" (* Variable: block_rdelim_newlines_default *) let block_rdelim_newlines_default = "}" (************************************************************************ * View: block_newline * A block enclosed in brackets, with newlines forced * and indentation defaulting to a tab. * * Parameters: * entry:lens - the entry to be stored inside the block. * This entry should not include <Util.empty>, * <Util.comment> or <Util.comment_noindent>, * should be indented and finish with an eol. ************************************************************************) let block_newlines (entry:lens) (comment:lens) = del block_ldelim_newlines_re block_ldelim_newlines_default . ((entry | comment) . (Util.empty | entry | comment)*)? . del block_rdelim_newlines_re block_rdelim_newlines_default (************************************************************************ * View: block_newlines_spc * A block enclosed in brackets, with newlines forced * and indentation defaulting to a tab. The opening brace * must be preceded by whitespace * * Parameters: * entry:lens - the entry to be stored inside the block. * This entry should not include <Util.empty>, * <Util.comment> or <Util.comment_noindent>, * should be indented and finish with an eol. ************************************************************************) let block_newlines_spc (entry:lens) (comment:lens) = del (/[ \t\n]/ . block_ldelim_newlines_re) block_ldelim_newlines_default . ((entry | comment) . (Util.empty | entry | comment)*)? . del block_rdelim_newlines_re block_rdelim_newlines_default (************************************************************************ * View: named_block * A named <block> enclosed in brackets * * Parameters: * kw:regexp - the regexp for the block name * entry:lens - the entry to be stored inside the block * this entry should not include <Util.empty> ************************************************************************) let named_block (kw:regexp) (entry:lens) = [ key kw . block entry . eol ] (************************************************************************ * Group: COMBINATORICS ************************************************************************) (************************************************************************ * View: combine_two_ord * Combine two lenses, ensuring first lens is first * * Parameters: * a:lens - the first lens * b:lens - the second lens ************************************************************************) let combine_two_ord (a:lens) (b:lens) = a . b (************************************************************************ * View: combine_two * Combine two lenses * * Parameters: * a:lens - the first lens * b:lens - the second lens ************************************************************************) let combine_two (a:lens) (b:lens) = combine_two_ord a b | combine_two_ord b a (************************************************************************ * View: combine_two_opt_ord * Combine two lenses optionally, ensuring first lens is first * (a, and optionally b) * * Parameters: * a:lens - the first lens * b:lens - the second lens ************************************************************************) let combine_two_opt_ord (a:lens) (b:lens) = a . b? (************************************************************************ * View: combine_two_opt * Combine two lenses optionally * (either a, b, or both, in any order) * * Parameters: * a:lens - the first lens * b:lens - the second lens ************************************************************************) let combine_two_opt (a:lens) (b:lens) = combine_two_opt_ord a b | combine_two_opt_ord b a (************************************************************************ * View: combine_three_ord * Combine three lenses, ensuring first lens is first * (a followed by either b, c, in any order) * * Parameters: * a:lens - the first lens * b:lens - the second lens * c:lens - the third lens ************************************************************************) let combine_three_ord (a:lens) (b:lens) (c:lens) = combine_two_ord a (combine_two b c) (************************************************************************ * View: combine_three * Combine three lenses * * Parameters: * a:lens - the first lens * b:lens - the second lens * c:lens - the third lens ************************************************************************) let combine_three (a:lens) (b:lens) (c:lens) = combine_three_ord a b c | combine_three_ord b a c | combine_three_ord c b a (************************************************************************ * View: combine_three_opt_ord * Combine three lenses optionally, ensuring first lens is first * (a followed by either b, c, or any of them, in any order) * * Parameters: * a:lens - the first lens * b:lens - the second lens * c:lens - the third lens ************************************************************************) let combine_three_opt_ord (a:lens) (b:lens) (c:lens) = combine_two_opt_ord a (combine_two_opt b c) (************************************************************************ * View: combine_three_opt * Combine three lenses optionally * (either a, b, c, or any of them, in any order) * * Parameters: * a:lens - the first lens * b:lens - the second lens * c:lens - the third lens ************************************************************************) let combine_three_opt (a:lens) (b:lens) (c:lens) = combine_three_opt_ord a b c | combine_three_opt_ord b a c | combine_three_opt_ord c b a