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annotate src/luan/modules/StringLuan.java @ 1563:8fbcc4747091

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remove LuanFunction.luan
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 09 Nov 2020 01:37:57 -0700
parents b89212fd04b5
children f7e2df85fc0a
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167
4c0131c2b650 merge luan/lib into modules
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1 package luan.modules;
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2
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3 import java.util.Arrays;
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4 import java.util.regex.Pattern;
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5 import java.util.regex.Matcher;
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6 import luan.Luan;
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7 import luan.LuanTable;
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8 import luan.LuanFunction;
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9 import luan.LuanException;
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11
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12 public final class StringLuan {
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14 static int start(String s,int i) {
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15 int len = s.length();
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16 return i==0 ? 0 : i > 0 ? Math.min(i-1,len) : Math.max(len+i,0);
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17 }
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19 static int start(String s,Integer i,int dflt) {
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20 return i==null ? dflt : start(s,i);
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21 }
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23 static int end(String s,int i) {
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24 int len = s.length();
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25 return i==0 ? 0 : i > 0 ? Math.min(i,len) : Math.max(len+i+1,0);
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26 }
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28 static int end(String s,Integer i,int dflt) {
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29 return i==null ? dflt : end(s,i);
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30 }
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31
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32 public static Integer[] unicode(String s,Integer i,Integer j) throws LuanException {
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33 Utils.checkNotNull(s);
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34 int start = start(s,i,0);
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35 int end = end(s,j,start+1);
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36 Integer[] chars = new Integer[end-start];
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37 for( int k=0; k<chars.length; k++ ) {
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38 chars[k] = (int)s.charAt(start+k);
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39 }
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40 return chars;
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41 }
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42
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43 public static String char_(int... chars) {
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44 char[] a = new char[chars.length];
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45 for( int i=0; i<chars.length; i++ ) {
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46 a[i] = (char)chars[i];
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47 }
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48 return new String(a);
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49 }
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51 public static byte[] to_binary(String s) {
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52 return s.getBytes();
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53 }
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54
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55 public static String lower(String s) throws LuanException {
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56 Utils.checkNotNull(s);
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57 return s.toLowerCase();
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58 }
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59
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60 public static String upper(String s) throws LuanException {
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61 Utils.checkNotNull(s);
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62 return s.toUpperCase();
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63 }
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64
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65 public static String trim(String s) throws LuanException {
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66 Utils.checkNotNull(s);
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67 return s.trim();
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68 }
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69
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70 public static String reverse(String s) throws LuanException {
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71 Utils.checkNotNull(s);
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72 return new StringBuilder(s).reverse().toString();
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73 }
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75 public static String rep(String s,int n,String sep) {
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76 if( n < 1 )
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77 return "";
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78 StringBuilder buf = new StringBuilder(s);
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79 while( --n > 0 ) {
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80 if( sep != null )
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81 buf.append(sep);
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82 buf.append(s);
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83 }
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84 return buf.toString();
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85 }
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86
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87 public static String sub(String s,int i,Integer j) throws LuanException {
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88 Utils.checkNotNull(s);
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89 int start = start(s,i);
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90 int end = end(s,j,s.length());
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91 return s.substring(start,end);
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92 }
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93
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94 public static Object[] find(String s,String pattern,Integer init,Boolean plain) {
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95 int start = start(s,init,0);
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96 if( Boolean.TRUE.equals(plain) ) {
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97 int i = s.indexOf(pattern,start);
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98 return i == -1 ? null : new Integer[]{i+1,i+pattern.length()};
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99 }
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100 Matcher m = Pattern.compile(pattern).matcher(s);
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101 if( !m.find(start) )
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102 return null;
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103 int n = m.groupCount();
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104 Object[] rtn = new Object[2+n];
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105 rtn[0] = m.start() + 1;
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106 rtn[1] = m.end();
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107 for( int i=0; i<n; i++ ) {
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108 rtn[2+i] = m.group(i+1);
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109 }
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110 return rtn;
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111 }
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112
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113 public static String[] match(String s,String pattern,Integer init) {
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114 int start = start(s,init,0);
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115 Matcher m = Pattern.compile(pattern).matcher(s);
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116 if( !m.find(start) )
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117 return null;
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118 int n = m.groupCount();
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119 if( n == 0 )
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120 return new String[]{m.group()};
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121 String[] rtn = new String[n];
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122 for( int i=0; i<n; i++ ) {
161
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123 rtn[i] = m.group(i+1);
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124 }
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125 return rtn;
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126 }
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127
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128 public static LuanFunction gmatch(String s,String pattern) throws LuanException {
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129 Utils.checkNotNull(s);
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130 Utils.checkNotNull(pattern,2);
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131 final Matcher m = Pattern.compile(pattern).matcher(s);
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132 return new LuanFunction() {
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133 @Override public Object call(Luan luan,Object[] args) {
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134 if( !m.find() )
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135 return null;
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136 final int n = m.groupCount();
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137 if( n == 0 )
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138 return m.group();
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139 String[] rtn = new String[n];
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140 for( int i=0; i<n; i++ ) {
138
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141 rtn[i] = m.group(i+1);
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142 }
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143 return rtn;
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144 }
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145 };
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146 }
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147
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148 public static Object[] gsub(Luan luan,String s,String pattern,Object repl,Integer n) throws LuanException {
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149 Utils.checkNotNull(s);
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150 int max = n==null ? Integer.MAX_VALUE : n;
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151 final Matcher m = Pattern.compile(pattern).matcher(s);
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152 if( repl instanceof String ) {
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153 String replacement = (String)repl;
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154 int i = 0;
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155 StringBuffer sb = new StringBuffer();
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156 while( i<max && m.find() ) {
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157 m.appendReplacement(sb,replacement);
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158 i++;
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159 }
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160 m.appendTail(sb);
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161 return new Object[]{ sb.toString(), i };
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162 }
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163 if( repl instanceof LuanTable ) {
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164 LuanTable t = (LuanTable)repl;
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165 int i = 0;
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166 StringBuffer sb = new StringBuffer();
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167 while( i<max && m.find() ) {
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168 String match = m.groupCount()==0 ? m.group() : m.group(1);
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169 Object val = t.get(luan,match);
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170 if( val != null ) {
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171 String replacement = luan.luanToString(val);
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172 m.appendReplacement(sb,replacement);
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173 }
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174 i++;
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175 }
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176 m.appendTail(sb);
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177 return new Object[]{ sb.toString(), i };
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178 }
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179 if( repl instanceof LuanFunction ) {
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180 LuanFunction fn = (LuanFunction)repl;
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181 int i = 0;
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182 StringBuffer sb = new StringBuffer();
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183 while( i<max && m.find() ) {
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184 Object[] args;
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185 final int count = m.groupCount();
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186 if( count == 0 ) {
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187 args = new String[]{m.group()};
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188 } else {
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189 args = new String[count];
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190 for( int j=0; j<count; j++ ) {
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191 args[j] = m.group(j+1);
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192 }
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193 }
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194 Object val = Luan.first( fn.call(luan,args) );
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195 if( val != null ) {
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196 String replacement = luan.luanToString(val);
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197 m.appendReplacement(sb,replacement);
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198 }
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199 i++;
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200 }
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201 m.appendTail(sb);
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202 return new Object[]{ sb.toString(), i };
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203 }
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204 throw new LuanException( "bad argument #3 to 'gsub' (string/function/table expected)" );
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205 }
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206
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207 // note - String.format() is too stupid to convert between ints and floats.
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208 public static String format(String format,Object... args) {
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209 return String.format(format,args);
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210 }
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211
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212 public static String encode(String s) {
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213 return Luan.stringEncode(s);
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214 }
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215
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216 public static Number to_number(String s,Integer base) throws LuanException {
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217 Utils.checkNotNull(s);
448
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218 try {
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219 if( base == null ) {
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220 return Double.valueOf(s);
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221 } else {
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222 return Long.valueOf(s,base);
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223 }
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224 } catch(NumberFormatException e) {}
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225 return null;
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226 }
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227
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228 public static boolean matches(String s,String pattern) throws LuanException {
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229 Utils.checkNotNull(s);
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230 return Pattern.compile(pattern).matcher(s).find();
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231 }
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232
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233 public static String[] split(String s,String pattern,Integer limit) throws LuanException {
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234 Utils.checkNotNull(s);
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235 int n = limit==null ? -1 : limit;
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236 return s.split(pattern,n);
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237 }
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238
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239 }