1 files changed, 127 insertions, 0 deletions
diff --git a/bin/make.l b/bin/make.l
new file mode 100644
index 00000000..6296716d
--- /dev/null
+++ b/bin/make.l
@@ -0,0 +1,127 @@
+/* Copyright (C) 2020  June McEnroe <june@causal.agency>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+%option prefix="make"
+%option noinput nounput noyywrap
+
+%{
+#include "hilex.h"
+%}
+
+%s Assign Preproc
+%x Variable Shell
+
+ident [._[:alnum:]]+
+assign [+?:!]?=
+target [-._/?*\[\][:alnum:]]+
+operator [:!]|::
+
+%%
+	static int pop = INITIAL;
+	static int depth = 0;
+
+^"\t"+ {
+	BEGIN(pop = Shell);
+	return Normal;
+}
+<Shell>{
+	"\n" {
+		BEGIN(pop = INITIAL);
+		return Normal;
+	}
+	"\\\n" { return Normal; }
+	[^\\\n$]+|. { return Normal; }
+}
+
+[[:blank:]]+ { return Normal; }
+
+{operator} { return Operator; }
+
+"."(PHONY|PRECIOUS|SUFFIXES)/{operator}? {
+	return Keyword;
+}
+
+{target}/{operator} { return Ident; }
+
+^"."{ident} |
+^"-"?include {
+	BEGIN(pop = Preproc);
+	return Macro;
+}
+<Preproc>{
+	"\n" {
+		BEGIN(pop = INITIAL);
+		return Normal;
+	}
+	"\\\n""\t"? { return Normal; }
+
+	"\""[^""]*"\"" |
+	"<"[^>]*">" {
+		return String;
+	}
+
+	[!<>=]"="?|"||"|"&&" { return Operator; }
+	[0-9]+|"0x"[[:xdigit:]]+ { return Number; }
+	defined|make|empty|exists|target|commands|in { return Keyword; }
+}
+
+^{ident}/[[:blank:]]*{assign} {
+	return Ident;
+}
+
+{assign} {
+	BEGIN(pop = Assign);
+	return Operator;
+}
+<Assign>{
+	"\n" {
+		BEGIN(pop = INITIAL);
+		return Normal;
+	}
+	"\\\n""\t"? { return Escape; }
+	[^\\$[:space:]]+|. { return String; }
+}
+
+{target} { return Ident; }
+
+"#"([^\\\n]|"\\"[^\n]|"\\\n")* { return Comment; }
+
+<*>{
+	"$"("{"|"(")/[^$] {
+		depth++;
+		BEGIN(Variable);
+		yymore();
+	}
+	"$"("{"|"(") {
+		depth++;
+		BEGIN(Variable);
+		return Subst;
+	}
+	"$". { return Subst; }
+}
+<Variable>{
+	[^${}()]*"}"|")" {
+		if (!--depth) BEGIN(pop);
+		return Subst;
+	}
+	[^${}()]+ { return Subst; }
+}
+
+.|\n { return Normal; }
+
+%%
+
+const struct Lexer LexMake = { yylex, &yyin, &yytext };