--- /dev/null
+// Copyright (C) 2003 Adam Megacz <adam@ibex.org> all rights reserved.
+//
+// You may modify, copy, and redistribute this code under the terms of
+// the GNU Library Public License version 2.1, with the exception of
+// the portion of clause 6a after the semicolon (aka the "obnoxious
+// relink clause")
+
+package org.ibex.util;
+
+import java.util.*;
+import java.io.*;
+
+/**
+ * A VERY crude, inefficient Java preprocessor
+ *
+ * //#define FOO bar baz -- replace all instances of token FOO with "bar baz"
+ * //#replace foo/bar baz/bop -- DUPLICATE everything between here and //#end,
+ * replacing foo with bar and baz with bop in the *second* copy
+ * //#switch(EXPR) -- switch on strings
+ * case "case1":
+ * //#end
+ *
+ * Replacements are done on a token basis. Tokens are defined as a
+ * sequence of characters which all belong to a single class. The
+ * two character classes are:
+ *
+ * - [a-zA-Z0-9_]
+ * - all other non-whitespace characters
+ */
+public class Preprocessor {
+
+ public static void main(String[] args) throws Exception {
+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+ BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+
+ // process stdin to stdout
+ Preprocessor cc = new Preprocessor(br, bw);
+ Vector err = cc.process();
+ bw.flush();
+
+ // handle errors
+ boolean errors = false;
+ for (int i=0; i < err.size(); i++) { if (err.get(i) instanceof Error) errors = true; System.err.println(err.get(i)); }
+ if (errors) throw new Exception();
+ }
+
+ private Reader r;
+ private Writer w;
+ private LineNumberReader in;
+ private PrintWriter out;
+
+ private Hashtable replace = new Hashtable();
+ private Hashtable repeatreplace = null;
+ private Vector sinceLastRepeat = null;
+ private Vector err = new Vector();
+
+ private int enumSwitch = 0; // number appended to variable used in switch implementation
+
+ public Preprocessor(Reader reader, Writer writer) {
+ setReader(reader);
+ setWriter(writer);
+ }
+
+ public void setReader(Reader reader) { r = reader; if (r != null) in = new LineNumberReader(r); }
+ public Reader getReader() { return r; }
+
+ public void setWriter(Writer writer) { w = writer; if (w != null) out = new PrintWriter(w); }
+ public Writer getWriter() { return w; }
+
+
+ /** process data from reader, write to writer, return vector of errors */
+ public Vector process() throws IOException {
+ err.clear();
+
+ String s = null;
+PROCESS:
+ while((s = in.readLine()) != null) {
+ if (sinceLastRepeat != null) sinceLastRepeat.addElement(s);
+ String trimmed = s.trim();
+
+ if (trimmed.startsWith("//#define ")) {
+ if (trimmed.length() == 9 || trimmed.charAt(9) != ' ') {
+ err.add(new Error("#define badly formed, ignored")); continue PROCESS;
+ }
+ int keyStart = indexOfNotWS(trimmed, 9);
+ if (keyStart == -1) {
+ err.add(new Error("#define requires KEY")); continue PROCESS;
+ }
+ int keyEnd = indexOfWS(trimmed, keyStart);
+
+ int macroStart = trimmed.indexOf('(');
+ int macroEnd = trimmed.indexOf(')');
+ if (macroStart > keyEnd) {
+ // no macro is defined, just make sure something dumb like KEYNA)ME hasn't been done
+ if (macroEnd < keyEnd) { err.add(new Error("#define key contains invalid char: ')'")); continue PROCESS; }
+ macroStart = macroEnd = -1;
+ }
+
+ if (macroStart == 0) {
+ err.add(new Error("#define macro requires name")); continue PROCESS;
+ } else if (macroStart > 0) {
+ if (macroStart > macroEnd) { err.add(new Error("#define macro badly formed")); continue PROCESS; }
+ if (macroStart+1 == macroEnd) { err.add(new Error("#define macro requires property name")); continue PROCESS; }
+
+ JSFunctionMacro fm = new JSFunctionMacro();
+ String key = trimmed.substring(keyStart, macroStart);
+ String unbound = trimmed.substring(macroStart +1, macroEnd);
+ int unboundDiv = unbound.indexOf(',');
+ if (unboundDiv == -1) {
+ fm.unbound1 = unbound;
+ } else {
+ fm.unbound1 = unbound.substring(0, unboundDiv);
+ fm.unbound2 = unbound.substring(unboundDiv +1);
+ if (fm.unbound1.length() == 0) { err.add(new Error("#define macro property 1 requires name")); continue PROCESS; }
+ if (fm.unbound2.length() == 0) { err.add(new Error("#define macro property 1 requires name")); continue PROCESS; }
+ }
+ fm.expression = trimmed.substring(keyEnd).trim();
+ replace.put(key, fm);
+ } else {
+ String key = trimmed.substring(keyStart, keyEnd);
+ String val = trimmed.substring(keyEnd).trim();
+ replace.put(key, val);
+ }
+ out.println(); // preserve line numbers
+
+ } else if (trimmed.startsWith("//#repeat ")) {
+ trimmed = trimmed.substring(9);
+ while(trimmed.charAt(trimmed.length() - 1) == '\\') {
+ String s2 = in.readLine().trim();
+ if (s2.startsWith("//")) s2 = s2.substring(2).trim();
+ trimmed = trimmed.substring(0, trimmed.length() - 1) + " " + s2;
+ out.println(); // preserve line numbers
+ }
+ StringTokenizer st = new StringTokenizer(trimmed, " ");
+ repeatreplace = (Hashtable)replace.clone();
+ while (st.hasMoreTokens()) {
+ String tok = st.nextToken().trim();
+ String key = tok.substring(0, tok.indexOf('/'));
+ String val = tok.substring(tok.indexOf('/') + 1);
+ repeatreplace.put(key, val);
+ }
+ sinceLastRepeat = new Vector();
+ out.println(); // preserve line numbers
+
+ } else if (trimmed.startsWith("//#end")) {
+ if (sinceLastRepeat == null) { err.add(new Warning("#end orphaned")); continue PROCESS; }
+ Hashtable save = replace;
+ replace = repeatreplace;
+ out.println();
+ for(int i=0; i<sinceLastRepeat.size() - 1; i++) out.print(processLine((String)sinceLastRepeat.elementAt(i), true));
+ sinceLastRepeat = null;
+ replace = save;
+
+ } else if (trimmed.startsWith("//#switch")) {
+ int expStart = trimmed.indexOf('(') +1;
+ if (expStart < 1) { err.add(new Error("expected ( in #switch")); continue PROCESS; }
+ int expEnd = trimmed.lastIndexOf(')');
+ if (expEnd == -1) { err.add(new Error("expected ) in #switch")); continue PROCESS; }
+ if (expEnd - expStart <= 1) { err.add(new Error("badly formed #switch statement")); continue PROCESS; }
+ String expr = trimmed.substring(expStart, expEnd);
+
+ out.println("final String ccSwitch"+enumSwitch+" = (String)("+expr+");");
+ out.println("SUCCESS:do { switch(ccSwitch"+enumSwitch+".length()) {");
+
+ Hashtable[] byLength = new Hashtable[255];
+ String key = null;
+ String Default = null;
+ for(trimmed = in.readLine().trim(); !trimmed.startsWith("//#end"); trimmed = in.readLine().trim()) {
+ if (trimmed.startsWith("default:")) {
+ Default = processLine(trimmed.substring(8), false);
+ continue;
+ }
+ if (trimmed.startsWith("case ")) {
+ // find key
+ int strStart = trimmed.indexOf('\"') +1;
+ if (strStart < 1) { err.add(new Error("expected opening of String literal")); continue PROCESS; }
+ int strEnd = trimmed.indexOf('\"', strStart);
+ if (strEnd == -1) { err.add(new Error("expected closing of String literal")); continue PROCESS; }
+ key = trimmed.substring(strStart, strEnd);
+
+ Hashtable thisCase = (Hashtable)byLength[key.length()];
+ if (thisCase == null) byLength[key.length()] = thisCase = new Hashtable();
+ thisCase.put(key, "");
+
+ // find end of case definition
+ int caseEnd = trimmed.indexOf(':', strEnd) +1;
+ if (caseEnd < 1) { err.add(new Error("expected :")); continue PROCESS; }
+ trimmed = trimmed.substring(caseEnd);
+ }
+
+ if (key != null) {
+ Hashtable hash = byLength[key.length()];
+ hash.put(key, (String)hash.get(key) + processLine(trimmed, false) + "\n");
+ } else {
+ out.print(processLine(trimmed, false));
+ }
+ }
+
+ for(int i=0; i<255; i++) {
+ if (byLength[i] == null) continue;
+ out.println("case " + i + ": { switch(ccSwitch"+enumSwitch+".charAt(0)) {");
+ buildTrie("", byLength[i]);
+ out.println("}; break; }");
+ }
+ out.println("} //switch");
+ if (Default != null) out.println(Default);
+ out.println("} while(false); //OUTER");
+ enumSwitch++;
+
+ } else {
+ out.print(processLine(s, false));
+ }
+ }
+
+ return err;
+ }
+
+ private void buildTrie(String prefix, Hashtable cases) {
+ Enumeration caseKeys = cases.keys();
+ Vec keys = new Vec();
+ while(caseKeys.hasMoreElements()) keys.addElement(caseKeys.nextElement());
+ keys.sort(new Vec.CompareFunc() { public int compare(Object a, Object b) {
+ return ((String)a).compareTo((String)b);
+ } } );
+
+ for(int i=0; i<keys.size(); i++) {
+ if (!((String)keys.elementAt(i)).startsWith(prefix)) continue;
+ String prefixPlusOne = ((String)keys.elementAt(i)).substring(0, prefix.length() + 1);
+ if (i<keys.size()-1 && prefixPlusOne.equals((((String)keys.elementAt(i + 1)).substring(0, prefix.length() + 1)))) {
+ out.println("case \'" + prefixPlusOne.charAt(prefixPlusOne.length() - 1) + "\': {");
+ out.println("switch(ccSwitch"+enumSwitch+".charAt(" + (prefix.length()+1) + ")) {");
+ buildTrie(prefixPlusOne, cases);
+ out.println("} break; }");
+ while(i<keys.size() && prefixPlusOne.equals(((String)keys.elementAt(i)).substring(0, prefix.length() + 1))) i++;
+ if (i<keys.size()) { i--; continue; }
+ } else {
+ out.println("case \'" + prefixPlusOne.charAt(prefixPlusOne.length() - 1) + "\':");
+ String code = (String)cases.get(keys.elementAt(i));
+ code = code.substring(0, code.length() - 1);
+ String key = (String)keys.elementAt(i);
+ out.println("if (\""+key+"\".equals(ccSwitch"+enumSwitch+")) { if (true) do { " + code + " } while(false); break SUCCESS; } break; ");
+ }
+ }
+ }
+
+ private String processLine(String s, boolean deleteLineEndings) throws IOException {
+ if (deleteLineEndings && s.indexOf("//") != -1) s = s.substring(0, s.indexOf("//"));
+ String ret = "";
+ for(int i=0; i<s.length(); i++) {
+ char c = s.charAt(i);
+ if (!Character.isLetter(c) && !Character.isDigit(c) && c != '_') {
+ ret += c;
+ continue;
+ }
+ int j;
+ for(j = i; j < s.length(); j++) {
+ c = s.charAt(j);
+ if (!Character.isLetter(c) && !Character.isDigit(c) && c != '_') break;
+ }
+ String tok = s.substring(i, j);
+ Object val = replace.get(tok);
+ if (val == null) {
+ ret += tok;
+ i = j - 1;
+ } else if (val instanceof JSFunctionMacro) {
+ if (s.charAt(j) != '(') { err.add(new Error("open paren must follow macro binding for macro " + tok)); continue; }
+ ret += ((JSFunctionMacro)val).process(s.substring(j+1, s.indexOf(')', j)));
+ i = s.indexOf(')', j);
+ } else {
+ ret += val;
+ i = j - 1;
+ }
+ }
+ if (!deleteLineEndings) ret += "\n";
+ return ret;
+ }
+
+ private static int indexOfWS(String s) { return indexOfWS(s, 0); }
+ private static int indexOfWS(String s, int beginIndex) {
+ if (s == null || beginIndex >= s.length()) return -1;
+ for (; beginIndex < s.length(); beginIndex++) {
+ if (s.charAt(beginIndex) == ' ') return beginIndex;
+ }
+ return s.length();
+ }
+
+ private static int indexOfNotWS(String s) { return indexOfWS(s, 0); }
+ private static int indexOfNotWS(String s, int beginIndex) {
+ if (s == null || beginIndex >= s.length()) return -1;
+ for (; beginIndex < s.length(); beginIndex++) {
+ if (s.charAt(beginIndex) != ' ') return beginIndex;
+ }
+ return -1;
+ }
+
+ public class Warning {
+ protected String msg;
+ protected int line;
+
+ public Warning() { msg = ""; }
+ public Warning(String m) { msg = m; if (in != null) line = in.getLineNumber(); }
+
+ public String toString() { return "WARNING Line "+line+": "+msg; }
+ }
+
+ public class Error extends Warning {
+ public Error() { super(); }
+ public Error(String m) { super(m); }
+ public String toString() { return "ERROR Line "+line+": "+msg; }
+ }
+
+ public static class JSFunctionMacro {
+ public String unbound1 = null;
+ public String unbound2 = null;
+ public String expression = null;
+ public String process(String args) {
+ String bound1 = null;
+ String bound2 = null;
+ if (unbound2 == null) {
+ bound1 = args;
+ return expression.replaceAll(unbound1, bound1);
+ } else {
+ bound1 = args.substring(0, args.indexOf(','));
+ bound2 = args.substring(args.indexOf(',') + 1);
+ return (expression.replaceAll(unbound1, bound1).replaceAll(unbound2, bound2));
+ }
+ }
+ }
+}
+
projects / org.ibex.core.git / blobdiff