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package bjc.dicelang.v2;
import java.util.List;
import java.util.LinkedList;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class DiceLangConsole {
private int commandNumber;
private DiceLangEngine eng;
public DiceLangConsole(String[] args) {
// @TODO do something with the args
commandNumber = 0;
eng = new DiceLangEngine();
}
public void run() {
System.out.println("dice-lang v0.2");
Scanner scn = new Scanner(System.in);
System.out.printf("(%d) dice-lang> ", commandNumber);
String comm = scn.nextLine();
while(!comm.equals("quit") && !comm.equals("exit")) {
if(comm.startsWith("pragma")) {
boolean success = handlePragma(comm.substring(7));
if(success)
System.out.println("Pragma completed succesfully");
else
System.out.println("Pragma execution failed");
} else {
System.out.printf("\tRaw command: %s\n", comm);
boolean success = eng.runCommand(comm);
if(success)
System.out.println("Command completed succesfully");
else
System.out.println("Command execution failed");
commandNumber += 1;
}
System.out.printf("(%d) dice-lang> ", commandNumber);
comm = scn.nextLine();
}
scn.close();
}
private boolean handlePragma(String pragma) {
System.out.println("\tRaw pragma: " + pragma);
String pragmaName = null;
int firstIndex = pragma.indexOf(' ');
if(firstIndex == -1) {
pragmaName = pragma;
} else {
pragmaName = pragma.substring(0, firstIndex);
}
switch(pragmaName) {
case "debug":
System.out.println("\tDebug mode is now " + eng.toggleDebug());
break;
case "postfix":
System.out.println("\tPostfix mode is now " + eng.togglePostfix());
break;
case "prefix":
System.out.println("\tPrefix mode is now " + eng.togglePrefix());
break;
case "define":
return defineMode(pragma.substring(7));
case "help":
return helpMode(pragma.substring(5));
default:
System.out.println("\tERROR: Unknown pragma: " + pragma);
return false;
}
return true;
}
private boolean helpMode(String pragma) {
switch(pragma.trim()) {
case "define":
System.out.println("\tdefine <priority> <type> <recursion> <guard> <circular> <patterns>...");
break;
default:
System.out.println("\tNo help available for pragma " + pragma);
}
// Help always works
return true;
}
/*
* Matches slash-delimited strings
* (like /text/ or /text\/text/)
* Uses the "normal* (special normal*)*" pattern style
* recommended in 'Mastering regular expressions'
* Here, the normal is 'anything but a forward or backslash'
* (in regex, thats '[^/\\]') and the special is 'an escaped forward slash'
* (in regex, thats '\\\\/')
*
* Then, we just follow the pattern, escape it for java strings, and
* add the enclosing slashes
*/
private Pattern slashPattern = Pattern.compile("/((?:\\\\.|[^/\\\\])*)/");
private boolean defineMode(String defineText) {
int firstIndex = defineText.indexOf(' ');
int secondIndex = defineText.indexOf(' ', firstIndex + 1);
int thirdIndex = defineText.indexOf(' ', secondIndex + 1);
int fourthIndex = defineText.indexOf(' ', thirdIndex + 1);
int fifthIndex = defineText.indexOf(' ', fourthIndex + 1);
int sixthIndex = defineText.indexOf(' ', fifthIndex + 1);
if(firstIndex == -1) {
System.out.println("\tERROR: Improperly formatted define (no priority)");
return false;
} else if(secondIndex == -1) {
System.out.println("\tERROR: Improperly formatted define (no define type)");
return false;
} else if(thirdIndex == -1) {
System.out.println("\tERROR: Improperly formatted define (no recursion type)");
return false;
} else if(fourthIndex == -1) {
System.out.println("\tERROR: Improperly formatted define (no guard type)");
return false;
} else if(fifthIndex == -1) {
System.out.println("\tERROR: Improperly formatted define (no circularity)");
return false;
} else if(sixthIndex == -1) {
System.out.println("\tERROR: Improperly formatted define (no patterns)");
return false;
}
int priority = Integer.parseInt(defineText.substring(0, firstIndex));
String defineType = defineText.substring(firstIndex + 1, secondIndex);
Define.Type type;
boolean subMode = false;
switch(defineType) {
case "line":
type = Define.Type.LINE;
break;
case "token":
type = Define.Type.TOKEN;
break;
case "subline":
type = Define.Type.LINE;
subMode = true;
break;
case "subtoken":
type = Define.Type.TOKEN;
subMode = true;
break;
default:
System.out.println("\tERROR: Unknown define type "
+ defineType);
return false;
}
boolean doRecur = defineText.substring(secondIndex + 1, thirdIndex)
.equalsIgnoreCase("true");
boolean hasGuard = defineText.substring(thirdIndex + 1, fourthIndex)
.equalsIgnoreCase("true");
boolean isCircular = defineText.substring(thirdIndex + 1, fourthIndex)
.equalsIgnoreCase("true");
String pats = defineText.substring(fifthIndex + 1).trim();
Matcher patMatcher = slashPattern.matcher(pats);
String guardPattern = null;
if(hasGuard) {
if(!patMatcher.find()) {
System.out.println("\tERROR: Improperly formatted define (no guard pattern)");
}
guardPattern = patMatcher.group(1);
}
if(!patMatcher.find()) {
System.out.println("\tERROR: Improperly formatted define (no search pattern)");
}
String searchPattern = patMatcher.group(1);
List<String> replacePatterns = new LinkedList<>();
while(patMatcher.find()) {
replacePatterns.add(patMatcher.group(1));
}
Define dfn = new Define(priority, subMode, doRecur, isCircular,
guardPattern, searchPattern, replacePatterns);
if(type == Define.Type.LINE) {
eng.addLineDefine(dfn);
} else {
eng.addTokenDefine(dfn);
}
return true;
}
public static void main(String[] args) {
DiceLangConsole console = new DiceLangConsole(args);
console.run();
}
}
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