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annotate graal/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/expression/Scanner.frame @ 19294:b31b2f289e7d

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Truffle-DSL: fix unnecessary frame cast warning.
author Christian Humer <christian.humer@gmail.com>
date Wed, 11 Feb 2015 16:10:45 +0100
parents 08aa0372dad4
children
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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 package com.oracle.truffle.dsl.processor.expression;
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30
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31 import java.io.InputStream;
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32 import java.io.IOException;
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33 import java.io.RandomAccessFile;
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34 import java.util.Map;
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35 import java.util.HashMap;
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36
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37 // Checkstyle: stop
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38 // @formatter:off
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39 class Token {
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40
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41 public int kind; // token kind
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42 public int pos; // token position in bytes in the source text (starting at 0)
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43 public int charPos; // token position in characters in the source text (starting at 0)
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44 public int col; // token column (starting at 1)
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45 public int line; // token line (starting at 1)
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46 public String val; // token value
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47 public Token next; // ML 2005-03-11 Peek tokens are kept in linked list
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48 }
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49
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50 // -----------------------------------------------------------------------------------
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51 // Buffer
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52 // -----------------------------------------------------------------------------------
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53 class Buffer {
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54
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55 // This Buffer supports the following cases:
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56 // 1) seekable stream (file)
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57 // a) whole stream in buffer
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58 // b) part of stream in buffer
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59 // 2) non seekable stream (network, console)
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60
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61 public static final int EOF = Character.MAX_VALUE + 1;
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62 private static final int MIN_BUFFER_LENGTH = 1024; // 1KB
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63 private static final int MAX_BUFFER_LENGTH = MIN_BUFFER_LENGTH * 64; // 64KB
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64 private byte[] buf; // input buffer
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65 private int bufStart; // position of first byte in buffer relative to input stream
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66 private int bufLen; // length of buffer
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67 private int fileLen; // length of input stream (may change if stream is no file)
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68 private int bufPos; // current position in buffer
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69 private RandomAccessFile file; // input stream (seekable)
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70 private InputStream stream; // growing input stream (e.g.: console, network)
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71
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72 public Buffer(InputStream s) {
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73 stream = s;
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74 fileLen = bufLen = bufStart = bufPos = 0;
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75 buf = new byte[MIN_BUFFER_LENGTH];
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76 }
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77
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78 public Buffer(String fileName) {
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79 try {
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80 file = new RandomAccessFile(fileName, "r");
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81 fileLen = (int) file.length();
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82 bufLen = Math.min(fileLen, MAX_BUFFER_LENGTH);
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83 buf = new byte[bufLen];
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84 bufStart = Integer.MAX_VALUE; // nothing in buffer so far
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85 if (fileLen > 0)
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86 setPos(0); // setup buffer to position 0 (start)
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87 else
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88 bufPos = 0; // index 0 is already after the file, thus setPos(0) is invalid
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89 if (bufLen == fileLen)
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90 Close();
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91 } catch (IOException e) {
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92 throw new FatalError("Could not open file " + fileName);
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93 }
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94 }
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95
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96 // don't use b after this call anymore
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97 // called in UTF8Buffer constructor
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98 protected Buffer(Buffer b) {
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99 buf = b.buf;
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100 bufStart = b.bufStart;
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101 bufLen = b.bufLen;
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102 fileLen = b.fileLen;
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103 bufPos = b.bufPos;
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104 file = b.file;
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105 stream = b.stream;
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106 // keep finalize from closing the file
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107 b.file = null;
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108 }
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109
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110 @Override
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111 protected void finalize() throws Throwable {
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112 super.finalize();
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113 Close();
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114 }
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115
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116 protected void Close() {
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117 if (file != null) {
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118 try {
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119 file.close();
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120 file = null;
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121 } catch (IOException e) {
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122 throw new FatalError(e.getMessage());
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123 }
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124 }
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125 }
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126
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127 public int Read() {
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128 if (bufPos < bufLen) {
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129 return buf[bufPos++] & 0xff; // mask out sign bits
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130 } else if (getPos() < fileLen) {
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131 setPos(getPos()); // shift buffer start to pos
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132 return buf[bufPos++] & 0xff; // mask out sign bits
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133 } else if (stream != null && ReadNextStreamChunk() > 0) {
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134 return buf[bufPos++] & 0xff; // mask out sign bits
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135 } else {
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136 return EOF;
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137 }
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138 }
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139
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140 public int Peek() {
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141 int curPos = getPos();
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
142 int ch = Read();
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
143 setPos(curPos);
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
144 return ch;
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
145 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
146
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
147 // beg .. begin, zero-based, inclusive, in byte
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
148 // end .. end, zero-based, exclusive, in byte
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
149 public String GetString(int beg, int end) {
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
150 int len = 0;
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
151 char[] buffer = new char[end - beg];
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
152 int oldPos = getPos();
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
153 setPos(beg);
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
154 while (getPos() < end)
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
155 buffer[len++] = (char) Read();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
156 setPos(oldPos);
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
157 return new String(buffer, 0, len);
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Christian Humer <christian.humer@gmail.com>
parents:
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158 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
159
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
160 public int getPos() {
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
161 return bufPos + bufStart;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
162 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
163
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Christian Humer <christian.humer@gmail.com>
parents:
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164 public void setPos(int value) {
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
165 if (value >= fileLen && stream != null) {
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
166 // Wanted position is after buffer and the stream
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
167 // is not seek-able e.g. network or console,
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Christian Humer <christian.humer@gmail.com>
parents:
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168 // thus we have to read the stream manually till
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
169 // the wanted position is in sight.
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
170 while (value >= fileLen && ReadNextStreamChunk() > 0) {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
171 // nothing to do...
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Christian Humer <christian.humer@gmail.com>
parents:
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172 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
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173 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
174
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
175 if (value < 0 || value > fileLen) {
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Christian Humer <christian.humer@gmail.com>
parents:
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176 throw new FatalError("buffer out of bounds access, position: " + value);
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Christian Humer <christian.humer@gmail.com>
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177 }
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Christian Humer <christian.humer@gmail.com>
parents:
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178
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Christian Humer <christian.humer@gmail.com>
parents:
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179 if (value >= bufStart && value < bufStart + bufLen) { // already in buffer
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
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180 bufPos = value - bufStart;
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Christian Humer <christian.humer@gmail.com>
parents:
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181 } else if (file != null) { // must be swapped in
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
182 try {
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Christian Humer <christian.humer@gmail.com>
parents:
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183 file.seek(value);
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
184 bufLen = file.read(buf);
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
185 bufStart = value;
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
186 bufPos = 0;
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
187 } catch (IOException e) {
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
188 throw new FatalError(e.getMessage());
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
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189 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
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190 } else {
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
191 // set the position to the end of the file, Pos will return fileLen.
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Christian Humer <christian.humer@gmail.com>
parents:
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192 bufPos = fileLen - bufStart;
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Christian Humer <christian.humer@gmail.com>
parents:
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193 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
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194 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
195
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Christian Humer <christian.humer@gmail.com>
parents:
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196 // Read the next chunk of bytes from the stream, increases the buffer
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
197 // if needed and updates the fields fileLen and bufLen.
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Christian Humer <christian.humer@gmail.com>
parents:
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198 // Returns the number of bytes read.
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Christian Humer <christian.humer@gmail.com>
parents:
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199 private int ReadNextStreamChunk() {
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Christian Humer <christian.humer@gmail.com>
parents:
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200 int free = buf.length - bufLen;
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
201 if (free == 0) {
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
202 // in the case of a growing input stream
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
203 // we can neither seek in the stream, nor can we
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
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204 // foresee the maximum length, thus we must adapt
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
205 // the buffer size on demand.
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Christian Humer <christian.humer@gmail.com>
parents:
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206 byte[] newBuf = new byte[bufLen * 2];
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
207 System.arraycopy(buf, 0, newBuf, 0, bufLen);
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Christian Humer <christian.humer@gmail.com>
parents:
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208 buf = newBuf;
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
209 free = bufLen;
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
210 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
211
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
212 int read;
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
213 try {
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
214 read = stream.read(buf, bufLen, free);
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
215 } catch (IOException ioex) {
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
216 throw new FatalError(ioex.getMessage());
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
217 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
218
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
219 if (read > 0) {
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
220 fileLen = bufLen = (bufLen + read);
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
221 return read;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
222 }
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
223 // end of stream reached
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
224 return 0;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
225 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
226 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
227
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
228 // -----------------------------------------------------------------------------------
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
229 // UTF8Buffer
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
230 // -----------------------------------------------------------------------------------
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
231 class UTF8Buffer extends Buffer {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
232
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
233 UTF8Buffer(Buffer b) {
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
234 super(b);
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
235 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
236
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
237 @Override
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
238 public int Read() {
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
239 int ch;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
240 do {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
241 ch = super.Read();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
242 // until we find a utf8 start (0xxxxxxx or 11xxxxxx)
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
243 } while ((ch >= 128) && ((ch & 0xC0) != 0xC0) && (ch != EOF));
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
244 if (ch < 128 || ch == EOF) {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
245 // nothing to do, first 127 chars are the same in ascii and utf8
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
246 // 0xxxxxxx or end of file character
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
247 } else if ((ch & 0xF0) == 0xF0) {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
248 // 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
249 int c1 = ch & 0x07;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
250 ch = super.Read();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
251 int c2 = ch & 0x3F;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
252 ch = super.Read();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
253 int c3 = ch & 0x3F;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
254 ch = super.Read();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
255 int c4 = ch & 0x3F;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
256 ch = (((((c1 << 6) | c2) << 6) | c3) << 6) | c4;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
257 } else if ((ch & 0xE0) == 0xE0) {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
258 // 1110xxxx 10xxxxxx 10xxxxxx
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
259 int c1 = ch & 0x0F;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
260 ch = super.Read();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
261 int c2 = ch & 0x3F;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
262 ch = super.Read();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
263 int c3 = ch & 0x3F;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
264 ch = (((c1 << 6) | c2) << 6) | c3;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
265 } else if ((ch & 0xC0) == 0xC0) {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
266 // 110xxxxx 10xxxxxx
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
267 int c1 = ch & 0x1F;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
268 ch = super.Read();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
269 int c2 = ch & 0x3F;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
270 ch = (c1 << 6) | c2;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
271 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
272 return ch;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
273 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
274 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
275
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
276 // -----------------------------------------------------------------------------------
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
277 // StartStates -- maps characters to start states of tokens
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
278 // -----------------------------------------------------------------------------------
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
279 class StartStates {
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parents:
diff changeset
280
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
281 private static class Elem {
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parents:
diff changeset
282
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
283 public int key, val;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
284 public Elem next;
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parents:
diff changeset
285
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
286 public Elem(int key, int val) {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
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287 this.key = key;
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288 this.val = val;
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289 }
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290 }
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291
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292 private Elem[] tab = new Elem[128];
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Christian Humer <christian.humer@gmail.com>
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293
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Christian Humer <christian.humer@gmail.com>
parents:
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294 public void set(int key, int val) {
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295 Elem e = new Elem(key, val);
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Christian Humer <christian.humer@gmail.com>
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296 int k = key % 128;
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Christian Humer <christian.humer@gmail.com>
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297 e.next = tab[k];
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298 tab[k] = e;
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299 }
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diff changeset
300
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Christian Humer <christian.humer@gmail.com>
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diff changeset
301 public int state(int key) {
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Christian Humer <christian.humer@gmail.com>
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302 Elem e = tab[key % 128];
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Christian Humer <christian.humer@gmail.com>
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303 while (e != null && e.key != key)
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Christian Humer <christian.humer@gmail.com>
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304 e = e.next;
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
305 return e == null ? 0 : e.val;
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Christian Humer <christian.humer@gmail.com>
parents:
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306 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
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diff changeset
307 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
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diff changeset
308
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
309 // -----------------------------------------------------------------------------------
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
310 // Scanner
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
311 // -----------------------------------------------------------------------------------
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Christian Humer <christian.humer@gmail.com>
parents:
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312 @SuppressWarnings({"rawtypes"})
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Christian Humer <christian.humer@gmail.com>
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313 public class Scanner {
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314
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Christian Humer <christian.humer@gmail.com>
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315 static final char EOL = '\n';
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Christian Humer <christian.humer@gmail.com>
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316 static final int eofSym = 0;
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Christian Humer <christian.humer@gmail.com>
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317 -->declarations
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318
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Christian Humer <christian.humer@gmail.com>
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319 public Buffer buffer; // scanner buffer
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320
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Christian Humer <christian.humer@gmail.com>
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321 Token t; // current token
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Christian Humer <christian.humer@gmail.com>
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322 int ch; // current input character
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Christian Humer <christian.humer@gmail.com>
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323 int pos; // byte position of current character
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Christian Humer <christian.humer@gmail.com>
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324 int charPos; // position by unicode characters starting with 0
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
325 int col; // column number of current character
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Christian Humer <christian.humer@gmail.com>
parents:
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326 int line; // line number of current character
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Christian Humer <christian.humer@gmail.com>
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327 int oldEols; // EOLs that appeared in a comment;
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Christian Humer <christian.humer@gmail.com>
parents:
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328 static final StartStates start; // maps initial token character to start state
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Christian Humer <christian.humer@gmail.com>
parents:
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329 static final Map literals; // maps literal strings to literal kinds
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Christian Humer <christian.humer@gmail.com>
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330
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
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331 Token tokens; // list of tokens already peeked (first token is a dummy)
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Christian Humer <christian.humer@gmail.com>
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332 Token pt; // current peek token
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Christian Humer <christian.humer@gmail.com>
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333
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Christian Humer <christian.humer@gmail.com>
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334 char[] tval = new char[16]; // token text used in NextToken(), dynamically enlarged
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Christian Humer <christian.humer@gmail.com>
parents:
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335 int tlen; // length of current token
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Christian Humer <christian.humer@gmail.com>
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336
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Christian Humer <christian.humer@gmail.com>
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337 static {
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Christian Humer <christian.humer@gmail.com>
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338 start = new StartStates();
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Christian Humer <christian.humer@gmail.com>
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339 literals = new HashMap();
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Christian Humer <christian.humer@gmail.com>
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340 -->initialization
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Christian Humer <christian.humer@gmail.com>
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341 }
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Christian Humer <christian.humer@gmail.com>
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342
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
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343 public Scanner(String fileName) {
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Christian Humer <christian.humer@gmail.com>
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344 buffer = new Buffer(fileName);
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Christian Humer <christian.humer@gmail.com>
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345 Init();
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Christian Humer <christian.humer@gmail.com>
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346 }
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Christian Humer <christian.humer@gmail.com>
parents:
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347
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Christian Humer <christian.humer@gmail.com>
parents:
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348 public Scanner(InputStream s) {
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349 buffer = new Buffer(s);
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Christian Humer <christian.humer@gmail.com>
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350 Init();
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Christian Humer <christian.humer@gmail.com>
parents:
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351 }
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
352
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Christian Humer <christian.humer@gmail.com>
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353 void Init() {
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Christian Humer <christian.humer@gmail.com>
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354 pos = -1;
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Christian Humer <christian.humer@gmail.com>
parents:
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355 line = 1;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
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356 col = 0;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
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357 charPos = -1;
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Christian Humer <christian.humer@gmail.com>
parents:
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358 oldEols = 0;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
359 NextCh();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
360 if (ch == 0xEF) { // check optional byte order mark for UTF-8
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
361 NextCh();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
362 int ch1 = ch;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
363 NextCh();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
364 int ch2 = ch;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
365 if (ch1 != 0xBB || ch2 != 0xBF) {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
366 throw new FatalError("Illegal byte order mark at start of file");
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Christian Humer <christian.humer@gmail.com>
parents:
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367 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
368 buffer = new UTF8Buffer(buffer);
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
369 col = 0;
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
370 charPos = -1;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
371 NextCh();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
372 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
373 pt = tokens = new Token(); // first token is a dummy
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
374 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
375
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
376 void NextCh() {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
377 if (oldEols > 0) {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
378 ch = EOL;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
379 oldEols--;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
380 } else {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
381 pos = buffer.getPos();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
382 // buffer reads unicode chars, if UTF8 has been detected
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
383 ch = buffer.Read();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
384 col++;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
385 charPos++;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
386 // replace isolated '\r' by '\n' in order to make
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
387 // eol handling uniform across Windows, Unix and Mac
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
388 if (ch == '\r' && buffer.Peek() != '\n')
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
389 ch = EOL;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
390 if (ch == EOL) {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
391 line++;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
392 col = 0;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
393 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
394 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
395 -->casing
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
396 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
397
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
398 void AddCh() {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
399 if (tlen >= tval.length) {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
400 char[] newBuf = new char[2 * tval.length];
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
401 System.arraycopy(tval, 0, newBuf, 0, tval.length);
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
402 tval = newBuf;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
403 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
404 if (ch != Buffer.EOF) {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
405 -->casing2
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
406 NextCh();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
407 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
408 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
409
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
410 -->comments
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
411
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
412 void CheckLiteral() {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
413 String val = t.val;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
414 -->casing3
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
415 Object kind = literals.get(val);
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
416 if (kind != null) {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
417 t.kind = ((Integer) kind).intValue();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
418 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
419 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
420
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
421 Token NextToken() {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
422 while (ch == ' ' ||
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
423 -->scan1
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
424 ) NextCh();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
425 -->scan2
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
426 int recKind = noSym;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
427 int recEnd = pos;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
428 t = new Token();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
429 t.pos = pos;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
430 t.col = col;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
431 t.line = line;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
432 t.charPos = charPos;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
433 int state = start.state(ch);
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
434 tlen = 0;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
435 AddCh();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
436
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
437 loop: for (;;) {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
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438 switch (state) {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
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439 case -1: {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
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440 t.kind = eofSym;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
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441 break loop;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
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442 } // NextCh already done
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
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443 case 0: {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
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444 if (recKind != noSym) {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
445 tlen = recEnd - t.pos;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
446 SetScannerBehindT();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
447 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
448 t.kind = recKind;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
449 break loop;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
450 } // NextCh already done
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
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451 -->scan3
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
452 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
453 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
454 t.val = new String(tval, 0, tlen);
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
455 return t;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
456 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
457
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
458 private void SetScannerBehindT() {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
459 buffer.setPos(t.pos);
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
460 NextCh();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
461 line = t.line;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
462 col = t.col;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
463 charPos = t.charPos;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
464 for (int i = 0; i < tlen; i++)
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
465 NextCh();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
466 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
467
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
468 // get the next token (possibly a token already seen during peeking)
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
469 public Token Scan() {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
470 if (tokens.next == null) {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
471 return NextToken();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
472 } else {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
473 pt = tokens = tokens.next;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
474 return tokens;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
475 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
476 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
477
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
478 // get the next token, ignore pragmas
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
479 public Token Peek() {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
480 do {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
481 if (pt.next == null) {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
482 pt.next = NextToken();
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
483 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
484 pt = pt.next;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
485 } while (pt.kind > maxT); // skip pragmas
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
486
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
487 return pt;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
488 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
489
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
490 // make sure that peeking starts at current scan position
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
491 public void ResetPeek() {
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
492 pt = tokens;
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
493 }
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
494
08aa0372dad4 Truffle-DSL: implement new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
495 } // end Scanner