1 files changed, 110 insertions, 0 deletions

diff --git a/edify/lexer.l b/edify/lexer.l
new file mode 100644
index 000000000..2c4489cc6
--- /dev/null
+++ b/edify/lexer.l
@@ -0,0 +1,110 @@
+%{
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "expr.h"
+#include "yydefs.h"
+#include "parser.h"
+
+int gLine = 1;
+int gColumn = 1;
+int gPos = 0;
+
+// TODO: enforce MAX_STRING_LEN during lexing
+char string_buffer[MAX_STRING_LEN];
+char* string_pos;
+
+#define ADVANCE do {yylloc.start=gPos; yylloc.end=gPos+yyleng; \
+                    gColumn+=yyleng; gPos+=yyleng;} while(0)
+
+%}
+
+%x STR
+
+%option noyywrap
+
+%%
+
+
+\" {
+    BEGIN(STR);
+    string_pos = string_buffer;
+    yylloc.start = gPos;
+    ++gColumn;
+    ++gPos;
+}
+
+<STR>{
+  \" {
+      ++gColumn;
+      ++gPos;
+      BEGIN(INITIAL);
+      *string_pos = '\0';
+      yylval.str = strdup(string_buffer);
+      yylloc.end = gPos;
+      return STRING;
+  }
+
+  \\n   { gColumn += yyleng; gPos += yyleng; *string_pos++ = '\n'; }
+  \\t   { gColumn += yyleng; gPos += yyleng;  *string_pos++ = '\t'; }
+  \\\"  { gColumn += yyleng; gPos += yyleng;  *string_pos++ = '\"'; }
+  \\\\  { gColumn += yyleng; gPos += yyleng;  *string_pos++ = '\\'; }
+
+  \\x[0-9a-fA-F]{2} {
+      gColumn += yyleng;
+      gPos += yyleng;
+      int val;
+      sscanf(yytext+2, "%x", &val);
+      *string_pos++ = val;
+  }
+
+  \n {
+      ++gLine;
+      ++gPos;
+      gColumn = 1;
+      *string_pos++ = yytext[0];
+  }
+
+  . {
+      ++gColumn;
+      ++gPos;
+      *string_pos++ = yytext[0];
+  }
+}
+
+if                ADVANCE; return IF;
+then              ADVANCE; return THEN;
+else              ADVANCE; return ELSE;
+endif             ADVANCE; return ENDIF;
+
+[a-zA-Z0-9_:/.]+ {
+  ADVANCE;
+  yylval.str = strdup(yytext);
+  return STRING;
+}
+
+\&\&              ADVANCE; return AND;
+\|\|              ADVANCE; return OR;
+==                ADVANCE; return EQ;
+!=                ADVANCE; return NE;
+
+[+(),!;]          ADVANCE; return yytext[0];
+
+[ \t]+            ADVANCE;
+
+(#.*)?\n          gPos += yyleng; ++gLine; gColumn = 1;
+
+.                 return BAD;