[muscript] Basic StarScript ingester

muscript/src/main/java/io/gitlab/jfronny/muscript/StarScriptIngester.java

@@ -0,0 +1,90 @@
+package io.gitlab.jfronny.muscript;
+
+import io.gitlab.jfronny.commons.log.*;
+
+import java.util.*;
+import java.util.stream.*;
+
+public class StarScriptIngester {
+    private static final Logger LOGGER = Logger.forName("MuScript");
+    /** Naive conversion of starscript syntax to muscript */
+    public static String starScriptToMu(String source) {
+        StringBuilder result = new StringBuilder();
+        StringBuilder currbuf = new StringBuilder();
+        State state = State.Surrounding;
+        for (char c : source.toCharArray()) {
+            switch (state) {
+                case Surrounding -> {
+                    if (c == '{') {
+                        if (!currbuf.isEmpty()) {
+                            if (!result.isEmpty()) result.append(" || ");
+                            result.append(enquote(currbuf.toString()));
+                        }
+                        currbuf = new StringBuilder();
+                        state = State.UnquotedInner;
+                    } else currbuf.append(c);
+                }
+                case UnquotedInner -> {
+                    switch (c) {
+                        case '}' -> {
+                            if (!currbuf.isEmpty()) {
+                                if (!result.isEmpty()) result.append(" || ");
+                                result.append("(").append(currbuf).append(")");
+                            }
+                            currbuf = new StringBuilder();
+                            state = State.Surrounding;
+                        }
+                        case '\'' -> {
+                            currbuf.append(c);
+                            state = State.SingleQuoteInner;
+                        }
+                        case '"' -> {
+                            currbuf.append(c);
+                            state = State.DoubleQuoteInner;
+                        }
+                        default -> currbuf.append(c);
+                    }
+                }
+                case SingleQuoteInner -> {
+                    currbuf.append(c);
+                    if (c == '\'') state = State.UnquotedInner;
+                }
+                case DoubleQuoteInner -> {
+                    currbuf.append(c);
+                    if (c == '"') state = State.UnquotedInner;
+                }
+            }
+        }
+        if (!currbuf.isEmpty() && !result.isEmpty()) result.append(" || ");
+        switch (state) {
+            case Surrounding -> {
+                if (!currbuf.isEmpty()) result.append(enquote(currbuf.toString()));
+            }
+            case UnquotedInner -> {
+                LOGGER.warn("Starscript code segment improperly closed, closing automatically");
+                if (!currbuf.isEmpty()) result.append("(").append(currbuf).append(")");
+            }
+            case SingleQuoteInner -> {
+                LOGGER.warn("Quote in starscript swallows ending, completing with closing quote");
+                if (!currbuf.isEmpty()) result.append("(").append(currbuf).append("')");
+            }
+            case DoubleQuoteInner -> {
+                LOGGER.warn("Quote in starscript swallows ending, completing with closing quote");
+                if (!currbuf.isEmpty()) result.append("(").append(currbuf).append("\")");
+            }
+        }
+        return result.toString();
+    }
+
+    /** Creates quotes around a string, supports strings containing quotes */
+    private static String enquote(String literalText) {
+        if (!literalText.contains("'")) return "'" + literalText + "'";
+        if (!literalText.contains("\"")) return "\"" + literalText + "\"";
+        return Arrays.stream(literalText.split("'")).map(s -> "'" + s + "'")
+                .collect(Collectors.joining(" || \"'\" || "));
+    }
+
+    enum State {
+        Surrounding, UnquotedInner, SingleQuoteInner, DoubleQuoteInner
+    }
+}

muscript/src/test/java/io/gitlab/jfronny/muscript/test/StarScriptIngesterTest.java

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+package io.gitlab.jfronny.muscript.test;
+
+import io.gitlab.jfronny.muscript.*;
+import org.junit.jupiter.api.*;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class StarScriptIngesterTest {
+    @Test
+    void ingestionTest() {
+        assertEquals("'Hello ' || (name) || '!'", StarScriptIngester.starScriptToMu("Hello {name}!"));
+        assertEquals("('Only \"Content')", StarScriptIngester.starScriptToMu("{'Only \"Content'}"));
+        assertEquals("(a + c / 75) || ' equals ' || (b)", StarScriptIngester.starScriptToMu("{a + c / 75} equals {b}"));
+    }
+}