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1 files changed, 246 insertions, 0 deletions

diff --git a/src/main/java/bjc/rgens/parser/RGrammarBuilder.java b/src/main/java/bjc/rgens/parser/RGrammarBuilder.java
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+++ b/src/main/java/bjc/rgens/parser/RGrammarBuilder.java
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+package bjc.rgens.parser;
+
+import bjc.rgens.parser.elements.CaseElement;
+import bjc.utils.funcdata.FunctionalList;
+import bjc.utils.funcdata.IList;
+
+import static bjc.rgens.parser.RuleCase.CaseType.*;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Construct randomized grammars piece by piece.
+ *
+ * @author EVE
+ */
+public class RGrammarBuilder {
+	/* The rules being built. */
+	private Map<String, Rule> rules;
+	/* The current set of exported rules. */
+	private Set<String> exportedRules;
+	/* The current initial rule. */
+	private String initialRule;
+
+	/** Create a new randomized grammar builder. */
+	public RGrammarBuilder() {
+		rules = new HashMap<>();
+
+		exportedRules = new HashSet<>();
+	}
+
+	/**
+	 * Get or create a rule by the given name.
+	 *
+	 * @param rName
+	 * 	The name of the rule.
+	 *
+	 * @return
+	 * 	The rule by that name, or a new one if none existed.
+	 */
+	public Rule getOrCreateRule(String rName) {
+		if(rName == null)
+			throw new NullPointerException("Rule name must not be null");
+		else if(rName.equals(""))
+			throw new IllegalArgumentException("The empty string is not a valid rule name");
+
+		if(rules.containsKey(rName))
+			return rules.get(rName);
+		else {
+			Rule ret = new Rule(rName);
+
+			rules.put(rName, ret);
+
+			return ret;
+		}
+	}
+
+	/**
+	 * Convert this builder into a grammar.
+	 *
+	 * @return 
+	 * 	The grammar built by this builder
+	 */
+	public RGrammar toRGrammar() {
+		RGrammar grammar = new RGrammar(rules);
+
+		grammar.setInitialRule(initialRule);
+
+		grammar.setExportedRules(exportedRules);
+
+		return grammar;
+	}
+
+	/**
+	 * Set the initial rule of the grammar.
+	 *
+	 * @param init
+	 * 	The initial rule of the grammar.
+	 *
+	 * @throws IllegalArgumentException
+	 * 	If the rule is either not valid or not defined in the grammar.
+	 */
+	public void setInitialRule(String init) {
+		if (init == null) {
+			throw new NullPointerException("init must not be null");
+		} else if (init.equals("")) {
+			throw new IllegalArgumentException("The empty string is not a valid rule name");
+		}
+
+		initialRule = init;
+	}
+
+	/**
+	 * Add an exported rule to this grammar.
+	 *
+	 * @param export
+	 * 	The name of the rule to export.
+	 *
+	 * @throws IllegalArgumentException
+	 * 	If the rule is either not valid or not defined in the grammar.
+	 */
+	public void addExport(String export) {
+		if (export == null) {
+			throw new NullPointerException("Export name must not be null");
+		} else if (export.equals("")) {
+			throw new NullPointerException("The empty string is not a valid rule name");
+		}
+
+		exportedRules.add(export);
+	}
+
+	/**
+	 * Suffix a given case element to every case of a specific rule.
+	 *
+	 * @param ruleName
+	 * 	The rule to suffix.
+	 *
+	 * @param suffix
+	 * 	The suffix to add.
+	 *
+	 * @throws IllegalArgumentException
+	 * 	If the rule name is either invalid or not defined by this
+	 * 	grammar, or if the suffix is invalid.
+	 */
+	public void suffixWith(String ruleName, String suffix) {
+		if (ruleName == null) {
+			throw new NullPointerException("Rule name must not be null");
+		} else if (ruleName.equals("")) {
+			throw new IllegalArgumentException("The empty string is not a valid rule name");
+		} else if(!rules.containsKey(ruleName)) {
+			String msg = String.format("Rule '%s' is not a valid rule name.");
+
+			throw new IllegalArgumentException(msg);
+		}
+
+		CaseElement element = CaseElement.createElement(suffix);
+
+		FunctionalList<RuleCase> newCases = new FunctionalList<>();
+
+		IList<RuleCase> caseList = rules.get(ruleName).getCases();
+		for (RuleCase ruleCase : caseList) {
+			FunctionalList<CaseElement> newCase = new FunctionalList<>();
+
+			for(CaseElement elm : ruleCase.getElements()) {
+				newCase.add(elm);
+			}
+
+			newCase.add(element);
+
+			newCases.add(new RuleCase(NORMAL, newCase));
+		}
+
+
+		for (RuleCase newCase : newCases) {
+			caseList.add(newCase);
+		}
+	}
+
+	/**
+	 * Prefix a given case element to every case of a specific rule.
+	 *
+	 * @param ruleName
+	 * 	The rule to prefix.
+	 *
+	 * @param prefix
+	 * 	The prefix to add.
+	 *
+	 * @throws IllegalArgumentException
+	 * 	If the rule name is either invalid or not defined by this
+	 * 	grammar, or if the prefix is invalid.
+	 */
+	public void prefixWith(String ruleName, String prefix) {
+		if (ruleName == null) {
+			throw new NullPointerException("Rule name must not be null");
+		} else if (ruleName.equals("")) {
+			throw new IllegalArgumentException("The empty string is not a valid rule name");
+		} else if(!rules.containsKey(ruleName)) {
+			String msg = String.format("Rule '%s' is not a valid rule name.");
+
+			throw new IllegalArgumentException(msg);
+		}
+
+		CaseElement element = CaseElement.createElement(prefix);
+
+		FunctionalList<RuleCase> newCases = new FunctionalList<>();
+
+		IList<RuleCase> caseList = rules.get(ruleName).getCases();
+		for (RuleCase ruleCase : caseList) {
+			FunctionalList<CaseElement> newCase = new FunctionalList<>();
+
+			newCase.add(element);
+
+			for(CaseElement elm : ruleCase.getElements()) {
+				newCase.add(elm);
+			}
+
+			newCases.add(new RuleCase(NORMAL, newCase));
+		}
+
+
+		for (RuleCase newCase : newCases) {
+			caseList.add(newCase);
+		}
+	}
+
+	public void despaceRule(String ruleName) {
+		if (ruleName == null) {
+			throw new NullPointerException("ruleName must not be null");
+		} else if (ruleName.equals("")) {
+			throw new IllegalArgumentException("The empty string is not a valid rule name");
+		}
+
+		IList<RuleCase> caseList = rules.get(ruleName).getCases();
+
+		IList<RuleCase> newCaseList = new FunctionalList<>();
+
+		for(RuleCase cse : caseList) {
+			newCaseList.add(new RuleCase(SPACEFLATTEN, cse.getElements()));
+		}
+
+		rules.get(ruleName).replaceCases(newCaseList);
+	}
+
+	public void regexizeRule(String rule, String pattern) {
+		if (rule == null) {
+			throw new NullPointerException("rule must not be null");
+		} else if(pattern == null) {
+			throw new NullPointerException("pattern must not be null");	
+		} else if (rule.equals("")) {
+			throw new IllegalArgumentException("The empty string is not a valid rule name");
+		}
+
+		IList<RuleCase> caseList = rules.get(rule).getCases();
+
+		IList<RuleCase> newCaseList = new FunctionalList<>();
+
+		for(RuleCase cse : caseList) {
+			newCaseList.add(new RegexRuleCase(cse.getElements(), pattern));
+		}
+
+		rules.get(rule).replaceCases(newCaseList);
+
+	}
+}