You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
83 lines
2.3 KiB
83 lines
2.3 KiB
4 years ago
|
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); }
|