Mercurial > hg > graal-compiler
annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/parser/Parser.frame @ 9372:98603705e565
Fix capping.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 27 Apr 2013 18:06:32 +0200 |
parents | b6743d7eb8d4 |
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1 /*------------------------------------------------------------------------- |
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2 Compiler Generator Coco/R, |
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3 Copyright (c) 1990, 2004 Hanspeter Moessenboeck, University of Linz |
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4 extended by M. Loeberbauer & A. Woess, Univ. of Linz |
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5 ported from C# to Java by Wolfgang Ahorner |
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6 with improvements by Pat Terry, Rhodes University |
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7 |
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8 This program is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 This program is distributed in the hope that it will be useful, but |
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14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License along |
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19 with this program; if not, write to the Free Software Foundation, Inc., |
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20 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 As an exception, it is allowed to write an extension of Coco/R that is |
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23 used as a plugin in non-free software. |
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24 |
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25 If not otherwise stated, any source code generated by Coco/R (other than |
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26 Coco/R itself) does not fall under the GNU General Public License. |
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27 ------------------------------------------------------------------------*/ |
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28 -->begin |
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29 import java.util.*; |
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30 |
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31 import com.oracle.truffle.sl.*; |
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32 import com.oracle.truffle.sl.nodes.*; |
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33 |
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34 // Checkstyle: stop |
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35 // @formatter:off |
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36 public class Parser { |
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37 -->constants |
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38 static final boolean T = true; |
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39 static final boolean x = false; |
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40 static final int minErrDist = 2; |
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41 |
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42 public Token t; // last recognized token |
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43 public Token la; // lookahead token |
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44 int errDist = minErrDist; |
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45 |
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46 public final Scanner scanner; |
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47 public final Errors errors; |
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48 private final NodeFactory factory; |
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50 public Parser(Scanner scanner, NodeFactory factory) { |
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51 this.scanner = scanner; |
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52 this.factory = factory; |
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53 errors = new Errors(); |
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54 } |
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55 |
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56 void SynErr(int n) { |
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57 if (errDist >= minErrDist) |
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58 errors.SynErr(la.line, la.col, n); |
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59 errDist = 0; |
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60 } |
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61 |
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62 public void SemErr(String msg) { |
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63 if (errDist >= minErrDist) |
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64 errors.SemErr(t.line, t.col, msg); |
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65 errDist = 0; |
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66 } |
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67 |
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68 void Get() { |
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69 for (;;) { |
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70 t = la; |
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71 la = scanner.Scan(); |
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72 if (la.kind <= maxT) { |
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73 ++errDist; |
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74 break; |
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75 } |
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76 -->pragmas |
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77 la = t; |
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78 } |
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79 } |
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80 |
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81 void Expect(int n) { |
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82 if (la.kind == n) |
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83 Get(); |
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84 else { |
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85 SynErr(n); |
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86 } |
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87 } |
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88 |
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89 boolean StartOf(int s) { |
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90 return set[s][la.kind]; |
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91 } |
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92 |
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93 void ExpectWeak(int n, int follow) { |
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94 if (la.kind == n) |
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95 Get(); |
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96 else { |
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97 SynErr(n); |
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98 while (!StartOf(follow)) |
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99 Get(); |
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100 } |
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101 } |
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102 |
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103 boolean WeakSeparator(int n, int syFol, int repFol) { |
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104 int kind = la.kind; |
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105 if (kind == n) { |
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106 Get(); |
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107 return true; |
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108 } else if (StartOf(repFol)) |
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109 return false; |
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110 else { |
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111 SynErr(n); |
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112 while (!(set[syFol][kind] || set[repFol][kind] || set[0][kind])) { |
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113 Get(); |
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114 kind = la.kind; |
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115 } |
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116 return StartOf(syFol); |
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117 } |
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118 } |
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119 |
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120 -->productions |
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121 |
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122 public void Parse() { |
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123 la = new Token(); |
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124 la.val = ""; |
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125 Get(); |
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126 -->parseRoot |
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127 } |
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128 |
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129 private static final boolean[][] set = { |
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130 -->initialization |
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131 }; |
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132 |
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133 public String ParseErrors() { |
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134 java.io.PrintStream oldStream = System.out; |
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135 |
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136 java.io.OutputStream out = new java.io.ByteArrayOutputStream(); |
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137 java.io.PrintStream newStream = new java.io.PrintStream(out); |
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138 |
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139 errors.errorStream = newStream; |
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140 |
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141 Parse(); |
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142 |
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143 String errorStream = out.toString(); |
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144 errors.errorStream = oldStream; |
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145 |
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146 return errorStream; |
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147 |
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148 } |
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149 } // end Parser |
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150 |
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151 class Errors { |
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152 |
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153 public int count = 0; // number of errors detected |
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154 public java.io.PrintStream errorStream = System.out; // error messages go to this stream |
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155 public String errMsgFormat = "-- line {0} col {1}: {2}"; // 0=line, 1=column, 2=text |
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156 |
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157 protected void printMsg(int line, int column, String msg) { |
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158 StringBuffer b = new StringBuffer(errMsgFormat); |
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159 int pos = b.indexOf("{0}"); |
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160 if (pos >= 0) { |
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161 b.delete(pos, pos + 3); |
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162 b.insert(pos, line); |
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163 } |
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164 pos = b.indexOf("{1}"); |
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165 if (pos >= 0) { |
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166 b.delete(pos, pos + 3); |
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167 b.insert(pos, column); |
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168 } |
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169 pos = b.indexOf("{2}"); |
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170 if (pos >= 0) |
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171 b.replace(pos, pos + 3, msg); |
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172 errorStream.println(b.toString()); |
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173 } |
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174 |
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175 public void SynErr(int line, int col, int n) { |
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176 String s; |
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177 switch (n) {-->errors |
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178 default: |
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179 s = "error " + n; |
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180 break; |
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181 } |
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182 printMsg(line, col, s); |
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183 count++; |
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184 } |
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185 |
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186 public void SemErr(int line, int col, String s) { |
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187 printMsg(line, col, s); |
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188 count++; |
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189 } |
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190 |
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191 public void SemErr(String s) { |
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192 errorStream.println(s); |
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193 count++; |
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194 } |
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195 |
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196 public void Warning(int line, int col, String s) { |
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197 printMsg(line, col, s); |
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198 } |
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199 |
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200 public void Warning(String s) { |
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201 errorStream.println(s); |
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202 } |
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203 } // Errors |
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204 |
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205 class FatalError extends RuntimeException { |
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206 |
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207 public static final long serialVersionUID = 1L; |
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208 |
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209 public FatalError(String s) { |
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210 super(s); |
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211 } |
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212 } |