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<!--#macro(hello(String name))-->Hello, ${name}!<!--#end--><!--#macro(welcome(String name))-->Welcome to hangzhou, ${name}!<!--#end-->

/** * 分词采用状态机模式根据不同关键字进行分词, * 让我想起了fastjson的解析，也是用的状态机模式 * @param charStream * @param offset * @param errorWithSource * @return * @throws ParseException */ public List<Token> scan(String charStream, int offset, boolean errorWithSource) throws ParseException { List<Token> tokens = new ArrayList<Token>(); // 解析时状态  StringBuilder buffer = new StringBuilder(); // 缓存字符 StringBuilder remain = new StringBuilder(); // 残存字符 int pre = 0; // 上一状态 int state = 0; // 当前状态 char ch; // 当前字符
 // 逐字解析 ---- int i = 0; int p = 0; for (; ; ) { if (remain.length() > 0) {  // 先处理残存字符 ch = remain.charAt(0); remain.deleteCharAt(0); } else { // 没有残存字符则读取字符流 if (i >= charStream.length()) { break; } ch = charStream.charAt(i++); offset++; }
 buffer.append(ch); // 将字符加入缓存 state = next(state, ch); // 从状态机图中取下一状态,状态机图采用二维数据装饰 if (state <= ERROR) { throw new ParseException("DFAScanner.state.error, error code: " + (ERROR - state) + (errorWithSource ? ", source: " + charStream : ""), offset - buffer.length()); } if (state <= POP) { int n = -(state % POP); int e = (state - n) / POP - 1; if (p <= 0) { throw new ParseException("DFAScanner.mismatch.stack" + (errorWithSource ? ", source: " + charStream : ""), offset - buffer.length()); } p--; if (p == 0) { state = e; if (state == 0) { state = BREAK; } } else { state = n; continue; } } else if (state <= PUSH) { p++; state = PUSH - state; continue; } if (state <= BREAK) { // 负数表示接收状态 int acceptLength; if (state <= BACKSPACE) { acceptLength = buffer.length() + state - BACKSPACE;//状态回退，回退所有空白符，退回的字符将重新读取 if (acceptLength > 0) { int space = 0; for (int s = acceptLength - 1; s >= 0; s--) { if (Character.isSpaceChar(buffer.charAt(s))) { space++; } else { break; } } acceptLength = acceptLength - space; } } else { acceptLength = buffer.length() + state - BREAK; } if (acceptLength < 0 || acceptLength > buffer.length()) throw new ParseException("DFAScanner.accepter.error" + (errorWithSource ? ", source: " + charStream : ""), offset - buffer.length()); if (acceptLength != 0) { String message = buffer.substring(0, acceptLength); Token token = new Token(message, offset - buffer.length(), pre); tokens.add(token);// 完成接收 } if (acceptLength != buffer.length()) //没有结束，比如"(hello),jack",httl会在读到','之后的'j'的时候回到分片状态 //那么会把"(hello)",作为第一个token,而','作为残存记录，开始状态回退state.BREAK从新读取 remain.insert(0, buffer.substring(acceptLength)); // 将未接收的缓存记入残存 buffer.setLength(0); // 清空缓存 state = 0; // 回归到初始状态 } pre = state; } // 接收最后缓存中的内容 if (buffer.length() > 0) { String message = buffer.toString(); tokens.add(new Token(message, offset - message.length(), pre)); } return tokens; }

private BlockDirective reduce(List<Statement> directives) throws ParseException { LinkedStack<BlockDirectiveEntry> directiveStack = new LinkedStack<BlockDirectiveEntry>(); RootDirective rootDirective = new RootDirective(); directiveStack.push(new BlockDirectiveEntry(rootDirective)); for (Statement directive : directives) { if (directive == null) continue; Class<?> directiveClass = directive.getClass(); // 弹栈 if (directiveClass == EndDirective.class || directiveClass == ElseDirective.class) { if (directiveStack.isEmpty()) throw new ParseException("Miss #end directive.", directive.getOffset()); BlockDirective blockDirective = directiveStack.pop().popDirective(); if (blockDirective == rootDirective) throw new ParseException("Miss #end directive.", directive.getOffset()); EndDirective endDirective; if (directiveClass == ElseDirective.class) { endDirective = new EndDirective(directive.getOffset()); } else { endDirective = (EndDirective) directive; } blockDirective.setEnd(endDirective); } // 设置树 if (directiveClass != EndDirective.class) { // 排除EndDirective if (directiveStack.isEmpty()) throw new ParseException("Miss #end directive.", directive.getOffset()); directiveStack.peek().appendInnerDirective(directive); } // 压栈 if (directive instanceof BlockDirective) directiveStack.push(new BlockDirectiveEntry((BlockDirective) directive)); } BlockDirective root = directiveStack.pop().popDirective(); if (!directiveStack.isEmpty()) { // 后验条件 throw new ParseException("Miss #end directive." + root.getClass().getSimpleName(), root.getOffset()); } return root; }   

package httl.spi.translators.templates;
import httl.test.model.*;import httl.test.method.*;import java.util.*;import httl.*;import httl.util.*;
public final class Template__macros_hello_httl_hello_comment_UTF_8_1580988759389_writer extends httl.spi.translators.templates.WriterTemplate {
private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[0], new Class[0]);private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[0], new Class[0]);private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[0], new Class[0]);private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[0], new Class[0]);private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[0], new Class[0]);private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final char[] $TXT1 = httl.util.CharCache.getAndRemove("2");private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final String $TXT2 = httl.util.StringCache.getAndRemove("1");private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final char[] $TXT3 = httl.util.CharCache.getAndRemove("3");private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});private static final java.util.Map $VARS = new httl.util.OrderedMap(new String[] {"name"}, new Class[] {java.lang.String.class});
private final httl.spi.methods.TypeMethod $httl_spi_methods_TypeMethod;private final httl.spi.methods.CodecMethod $httl_spi_methods_CodecMethod;private final httl.spi.methods.LangMethod $httl_spi_methods_LangMethod;private final httl.spi.methods.FileMethod $httl_spi_methods_FileMethod;private final httl.spi.methods.MessageMethod $httl_spi_methods_MessageMethod;

public Template__macros_hello_httl_hello_comment_UTF_8_1580988759389_writer(httl.Engine engine, httl.spi.Interceptor interceptor, httl.spi.Compiler compiler, httl.spi.Switcher filterSwitcher, httl.spi.Switcher formatterSwitcher, httl.spi.Filter filter, httl.spi.Formatter formatter, httl.spi.Converter mapConverter, httl.spi.Converter outConverter, java.util.Map functions, java.util.Map importMacros, httl.Resource resource, httl.Template parent, httl.Node root) { super(engine, interceptor, compiler, filterSwitcher, formatterSwitcher, filter, formatter, mapConverter, outConverter, functions, importMacros, resource, parent, root); this.$httl_spi_methods_TypeMethod = (httl.spi.methods.TypeMethod) functions.get(httl.spi.methods.TypeMethod.class); this.$httl_spi_methods_CodecMethod = (httl.spi.methods.CodecMethod) functions.get(httl.spi.methods.CodecMethod.class); this.$httl_spi_methods_LangMethod = (httl.spi.methods.LangMethod) functions.get(httl.spi.methods.LangMethod.class); this.$httl_spi_methods_FileMethod = (httl.spi.methods.FileMethod) functions.get(httl.spi.methods.FileMethod.class); this.$httl_spi_methods_MessageMethod = (httl.spi.methods.MessageMethod) functions.get(httl.spi.methods.MessageMethod.class);}
protected void doRenderWriter(httl.Context $context, java.io.Writer $output) throws java.lang.Exception { httl.spi.Filter $filter = getFilter($context, "filter"); httl.spi.Filter filter = $filter; httl.spi.formatters.MultiFormatter $formatter = getFormatter($context, "formatter"); httl.spi.formatters.MultiFormatter formatter = $formatter; java.lang.String name = (java.lang.String) $context.get("name"); $output.write($TXT1); $output.write(doFilter(filter, $TXT2, formatter.toString($TXT2, name))); $output.write($TXT3);}
public String getName() { return "/macros/hello.httl#hello";}
public java.util.Map getVariables() { return $VARS;}
protected java.util.Map getMacroTypes() { return new httl.util.OrderedMap(new String[0], new Class[0]);}
public boolean isMacro() { return true;}
public int getOffset() { return 0;}
}