Initial commit

2021-02-09 10:56:17 +00:00
commit 54e35e2b89
114 changed files with 5696 additions and 0 deletions
@@ -0,0 +1,82 @@
+package chocopy.pa1;
+import java_cup.runtime.*;
+
+%%
+
+/*** Do not change the flags below unless you know what you are doing. ***/
+
+%unicode
+%line
+%column
+
+%class ChocoPyLexer
+%public
+
+%cupsym ChocoPyTokens
+%cup
+%cupdebug
+
+%eofclose false
+
+/*** Do not change the flags above unless you know what you are doing. ***/
+
+/* The following code section is copied verbatim to the
+ * generated lexer class. */
+%{
+    /* The code below includes some convenience methods to create tokens
+     * of a given type and optionally a value that the CUP parser can
+     * understand. Specifically, a lot of the logic below deals with
+     * embedded information about where in the source code a given token
+     * was recognized, so that the parser can report errors accurately.
+     * (It need not be modified for this project.) */
+
+    /** Producer of token-related values for the parser. */
+    final ComplexSymbolFactory symbolFactory = new ComplexSymbolFactory();
+
+    /** Return a terminal symbol of syntactic category TYPE and no
+     *  semantic value at the current source location. */
+    private Symbol symbol(int type) {
+        return symbol(type, yytext());
+    }
+
+    /** Return a terminal symbol of syntactic category TYPE and semantic
+     *  value VALUE at the current source location. */
+    private Symbol symbol(int type, Object value) {
+        return symbolFactory.newSymbol(ChocoPyTokens.terminalNames[type], type,
+            new ComplexSymbolFactory.Location(yyline + 1, yycolumn + 1),
+            new ComplexSymbolFactory.Location(yyline + 1,yycolumn + yylength()),
+            value);
+    }
+
+%}
+
+/* Macros (regexes used in rules below) */
+
+WhiteSpace = [ \t]
+LineBreak  = \r|\n|\r\n
+
+IntegerLiteral = 0 | [1-9][0-9]*
+
+%%
+
+
+<YYINITIAL> {
+
+  /* Delimiters. */
+  {LineBreak}                 { return symbol(ChocoPyTokens.NEWLINE); }
+
+  /* Literals. */
+  {IntegerLiteral}            { return symbol(ChocoPyTokens.NUMBER,
+                                                 Integer.parseInt(yytext())); }
+
+  /* Operators. */
+  "+"                         { return symbol(ChocoPyTokens.PLUS, yytext()); }
+
+  /* Whitespace. */
+  {WhiteSpace}                { /* ignore */ }
+}
+
+<<EOF>>                       { return symbol(ChocoPyTokens.EOF); }
+
+/* Error fallback. */
+[^]                           { return symbol(ChocoPyTokens.UNRECOGNIZED); }