From e7c2ce4ba9bd684a6722baf9ce58e91dfacc8eb3 Mon Sep 17 00:00:00 2001 From: "Benjamin J. Culkin" Date: Tue, 29 May 2018 19:15:57 -0300 Subject: Refactor to split RuleCaseElement The various types of RuleCaseElement are now their own things. --- .../parser/elements/VariableRuleReference.java | 31 ++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 src/main/java/bjc/rgens/parser/elements/VariableRuleReference.java (limited to 'src/main/java/bjc/rgens/parser/elements/VariableRuleReference.java') diff --git a/src/main/java/bjc/rgens/parser/elements/VariableRuleReference.java b/src/main/java/bjc/rgens/parser/elements/VariableRuleReference.java new file mode 100644 index 0000000..bebb9f7 --- /dev/null +++ b/src/main/java/bjc/rgens/parser/elements/VariableRuleReference.java @@ -0,0 +1,31 @@ +package bjc.rgens.parser.elements; + +import bjc.rgens.parser.GrammarException; +import bjc.rgens.parser.GenerationState; + +public class VariableRuleReference extends RuleCaseElement { + public VariableRuleReference(String vl) { + super(vl, ReferenceType.VARIABLE); + } + + public void generate(GenerationState state) { + String refBody = val.substring(1, val.length() - 1); + + /* Handle string references. */ + if (refBody.equals("$")) { + throw new GrammarException("Cannot refer to unnamed variables"); + } + + String key = refBody.substring(1); + + if (!state.vars.containsKey(key)) { + String msg = String.format("No variable '%s' defined", key); + + throw new GrammarException(msg); + } + + state.contents.append(state.vars.get(key)); + + return; + } +} -- cgit v1.2.3