142 lines
3.4 KiB
Nix
142 lines
3.4 KiB
Nix
# Parse go.mod in Nix
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# Returns a Nix structure with the contents of the go.mod passed in
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# in normalised form.
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let
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inherit (builtins) elemAt mapAttrs split foldl' match filter typeOf hasAttr length;
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# Strip lines with comments & other junk
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stripStr = s: elemAt (split "^ *" (elemAt (split " *$" s) 0)) 2;
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stripLines = initialLines: foldl' (acc: f: f acc) initialLines [
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# Strip comments
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(lines: map
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(l: stripStr (elemAt (splitString "//" l) 0))
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lines)
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# Strip leading tabs characters
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(lines: map (l: elemAt (match "(\t)?(.*)" l) 1) lines)
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# Filter empty lines
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(filter (l: l != ""))
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];
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# Parse lines into a structure
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parseLines = lines: (foldl'
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(acc: l:
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let
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m = match "([^ )]*) *(.*)" l;
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directive = elemAt m 0;
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rest = elemAt m 1;
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# Maintain parser state (inside parens or not)
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inDirective =
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if rest == "(" then directive
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else if rest == ")" then null
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else acc.inDirective
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;
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in
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{
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data = (acc.data // (
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if directive == "" && rest == ")" then { }
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else if inDirective != null && rest == "(" && ! hasAttr inDirective acc.data then {
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${inDirective} = { };
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}
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else if rest == "(" || rest == ")" then { }
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else if inDirective != null then {
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${inDirective} = acc.data.${inDirective} // { ${directive} = rest; };
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} else if directive == "replace" then
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(
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let
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segments = split " => " rest;
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getSegment = elemAt segments;
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in
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assert length segments == 3; {
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replace = acc.data.replace // {
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${getSegment 0} = "=> ${getSegment 2}";
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};
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}
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)
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else {
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${directive} = rest;
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}
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)
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);
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inherit inDirective;
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})
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{
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inDirective = null;
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data = {
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require = { };
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replace = { };
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exclude = { };
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};
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}
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lines
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).data;
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normaliseDirectives = data: (
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let
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normaliseString = s:
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let
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m = builtins.match "([^ ]+) (.+)" s;
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in
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{
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${elemAt m 0} = elemAt m 1;
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};
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require = data.require or { };
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replace = data.replace or { };
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exclude = data.exclude or { };
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in
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data // {
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require =
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if typeOf require == "string" then normaliseString require
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else require;
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replace =
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if typeOf replace == "string" then normaliseString replace
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else replace;
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}
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);
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parseVersion = ver:
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let
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m = elemAt (match "([^-]+)-?([^-]*)-?([^-]*)" ver);
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v = elemAt (match "([^+]+)\\+?(.*)" (m 0));
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in
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{
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version = v 0;
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versionSuffix = v 1;
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date = m 1;
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rev = m 2;
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};
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parseReplace = data: (
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data // {
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replace =
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mapAttrs
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(_: v:
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let
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m = match "=> ([^ ]+) (.+)" v;
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m2 = match "=> (.*+)" v;
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in
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if m != null then {
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goPackagePath = elemAt m 0;
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version = elemAt m 1;
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} else {
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path = elemAt m2 0;
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})
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data.replace;
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}
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);
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splitString = sep: s: filter (t: t != [ ]) (split sep s);
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in
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contents:
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foldl' (acc: f: f acc) (splitString "\n" contents) [
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stripLines
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parseLines
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normaliseDirectives
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parseReplace
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]
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