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687
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1 package luan.modules.parsers;
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2
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3 import luan.LuanException;
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4
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5
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6 public final class Theme {
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7
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8 public static String toLuan(String source) throws LuanException {
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9 try {
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10 return new Theme(source).parse();
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11 } catch(ParseException e) {
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12 throw new LuanException(e.getMessage());
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13 }
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14 }
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15
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16 private final Parser parser;
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17
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18 private Theme(String source) {
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19 this.parser = new Parser(source);
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20 }
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21
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22 private ParseException exception(String msg) {
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23 // parser.failure();
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24 return new ParseException(parser,msg);
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25 }
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26
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27 private String parse() throws ParseException {
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28 StringBuilder stmts = new StringBuilder();
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29 stmts.append( "local M = {}; " );
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30 while( !parser.endOfInput() ) {
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31 String def = parseDef();
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32 if( def != null ) {
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33 stmts.append(def);
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34 } else {
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35 // parser.anyChar();
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36 stmts.append(parsePadding());
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37 }
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38 }
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39 stmts.append( "\n\nreturn M\n" );
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40 return stmts.toString();
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41 }
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42
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43 private String parsePadding() throws ParseException {
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44 int start = parser.currentIndex();
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45 if( parser.match("--") ) {
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46 while( parser.noneOf("\r\n") );
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47 } else if( !parser.anyOf(" \t\r\n") ) {
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48 throw exception("unexpected text");
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49 }
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50 return parser.textFrom(start);
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51 }
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52
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53 private String parseDef() throws ParseException {
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54 int start = parser.begin();
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55 if( !parser.match("{define:") )
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56 return parser.failure(null);
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57 String name = parseName();
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58 if( name==null )
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59 throw exception("invalid block name");
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60 if( !parser.match('}') )
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61 throw exception("unclosed define tag");
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62 String block = parseBody("define:"+name);
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688
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63 String rtn = "function M." + name + "(env) " + block + " end; ";
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687
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64 return parser.success(rtn);
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65 }
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66
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67 private String parseBody(String tagName) throws ParseException {
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68 StringBuilder stmts = new StringBuilder();
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69 int start = parser.currentIndex();
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70 int end = start;
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71 while( !matchEndTag(tagName) ) {
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72 if( parser.endOfInput() ) {
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73 parser.failure();
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74 throw exception("unclosed block");
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75 }
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76 String block = parseBlock();
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77 if( block != null ) {
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78 addText(start,end,stmts);
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79 start = parser.currentIndex();
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80 stmts.append(block);
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81 continue;
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82 }
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83 String simpleTag = parseSimpleTag();
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84 if( simpleTag != null ) {
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85 addText(start,end,stmts);
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86 start = parser.currentIndex();
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87 stmts.append(simpleTag);
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88 continue;
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89 }
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690
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90 if( parser.match("<%") ) {
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91 addText(start,end,stmts);
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92 start = parser.currentIndex();
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93 stmts.append("%><%='<%'%><%");
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94 continue;
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95 }
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687
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96 parser.anyChar();
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97 end = parser.currentIndex();
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98 }
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99 addText(start,end,stmts);
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100 return stmts.toString();
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101 }
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102
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103 private boolean matchEndTag(String tagName) {
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104 parser.begin();
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105 /*
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106 if( tagName.startsWith("define:") )
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107 EndOfLine();
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108 */
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109 return parser.match("{/") && parser.match(tagName) && parser.match('}') ? parser.success() : parser.failure();
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110 }
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111
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112 private void addText(int start,int end,StringBuilder stmts) {
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113 if( start < end ) {
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688
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114 stmts.append( "%>" ).append( parser.text.substring(start,end) ).append( "<%" );
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687
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115 }
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116 }
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117
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118 private String parseBlock() throws ParseException {
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119 int start = parser.begin();
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120 if( !parser.match("{block:") )
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121 return parser.failure(null);
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122 String name = parseName();
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123 if( name==null ) {
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124 parser.failure();
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125 throw exception("invalid block name");
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126 }
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127 if( !parser.match('}') )
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128 return parser.failure(null);
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129 String block = parseBody("block:"+name);
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688
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130 String rtn = " env."+ name + "( env, function(env) " + block + "end); ";
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687
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131 // String rtn = "<% env." + tag.name + "(" + (tag.attrs.isEmpty() ? "nil" : table(tag.attrs)) + ",env,function(env) %>" + block + "<% end) %>";
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132 return parser.success(rtn);
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133 }
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134
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135 private String parseSimpleTag() throws ParseException {
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136 int start = parser.begin();
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137 if( !parser.match('{') )
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138 return parser.failure(null);
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139 String name = parseName();
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140 if( name==null )
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141 return parser.failure(null);
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142 if( !parser.match('}') )
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143 return parser.failure(null);
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144 // rtn = "<% env." + name + (attrs.isEmpty() ? "()" : table(attrs)) + " %>";
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688
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145 String rtn = " env." + name + "(env); ";
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687
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146 return parser.success(rtn);
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147 }
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148
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149 private boolean BlankLine() {
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150 parser.begin();
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151 while( parser.anyOf(" \t") );
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152 return EndOfLine() ? parser.success() : parser.failure();
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153 }
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154
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155 private boolean EndOfLine() {
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156 return parser.match( "\r\n" ) || parser.match( '\r' ) || parser.match( '\n' );
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157 }
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158
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159 private String parseName() throws ParseException {
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160 int start = parser.begin();
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161 if( parser.match('/') ) {
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162 parser.failure();
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163 throw exception("bad closing tag");
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164 }
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165 if( parser.match("define:") ) {
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166 parser.failure();
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167 throw exception("unexpected definition");
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168 }
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169 if( !FirstNameChar() )
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170 return parser.failure(null);
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171 while( NameChar() );
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172 String match = parser.textFrom(start);
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173 return parser.success(match);
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174 }
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175
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176 private boolean FirstNameChar() {
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177 return parser.inCharRange('a', 'z') || parser.inCharRange('A', 'Z') || parser.match('_');
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178 }
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179
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180 private boolean NameChar() {
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181 return FirstNameChar() || parser.inCharRange('0', '9');
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182 }
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183
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184 }
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