Parser.java

package li.template;

import li.util.Log;

public class Parser {
    private static final Log log = Log.init();
    private String source;
    private String name;
    private String content;

    public void setName(String name) {
        this.name = name;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public void parse() {
        log.info("parsing template " + name);
        try {
            String packageName = "li.template.impl";
            String className = name.replace(".", "_") + "_utf8_writer";

            String source = head(packageName, className);

            String local_variables = "";
            String page_code = "";
            String temp1 = "";
            for (int i = 0; i < content.length(); i++) {
                char each = content.charAt(i);

                if ('<' == each) {
                    if ('!' == content.charAt(++i) && '-' == content.charAt(++i) && '-' == content.charAt(++i)) {// 语句开始
                        if (!temp1.isEmpty()) {
                            page_code += write("\"" + temp1 + "\"");// 输出缓冲的静态文本
                            temp1 = "";// 清空静态文本缓冲区
                        }

                        String value = "";// 静态文本
                        char[] temp = new char[3];
                        while (true) {
                            temp[0] = content.charAt(++i);
                            if ('-' == temp[0]) {
                                temp[1] = content.charAt(++i);
                                temp[2] = content.charAt(++i);
                                if ('-' == temp[1] && '>' == temp[2]) {// 语句结束
                                    page_code += value;// 语句输出
                                    break;
                                } else {
                                    value += new String(temp);
                                }
                            } else {
                                value += temp[0];
                            }
                        }
                    }
                } else if ('$' == each) {
                    if ('{' == content.charAt(++i)) {// 表达式
                        if (!temp1.isEmpty()) {
                            page_code += write("\"" + temp1 + "\"");// 输出缓冲的静态文本
                            temp1 = "";// 清空静态文本缓冲区
                        }

                        String value = "";
                        while (true) {
                            each = content.charAt(++i);
                            if ('}' == each) {
                                page_code += write(value);// 取值输出
                                break;
                            } else {
                                value += each;
                            }
                        }
                    }
                } else {// 文本
                    temp1 += each;
                }
            }

            source += local_variables;
            source += page_code;
            source += foot();

            this.source = source;
            this.name = packageName + "." + className;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public String getSource() {
        return source;
    }

    public String getName() {
        return name;
    }

    private String head(String packageName, String className) {
        return "package " + packageName + ";" + //
                "import java.io.*;" + //
                "import java.util.*;" + //
                "import li.template.*;" + //
                "public class " + className + " extends Template {" + //
                "protected void doRender(Map<?,?> map, Writer out) throws Exception {";
    }

    private String foot() {
        return "out.flush();" + //
                "out.close();" + //
                "}" + //
                "}";
    }

    private String write(String value) {
        return "out.write(" + value + "+\"\");";
    }
}