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package com.jclark.xsl.expr;
import com.jclark.xsl.om.*;
class ExprTokenizer {
static final int TOK_EOF = 0;
static final int TOK_QNAME = TOK_EOF + 1;
static final int TOK_STAR = TOK_QNAME + 1;
static final int TOK_NAME_COLON_STAR = TOK_STAR + 1;
static final int TOK_AT = TOK_NAME_COLON_STAR + 1;
static final int TOK_DOT = TOK_AT + 1;
static final int TOK_DOT_DOT = TOK_DOT + 1;
static final int TOK_COMMENT_LPAR = TOK_DOT_DOT + 1;
static final int TOK_PROCESSING_INSTRUCTION_LPAR = TOK_COMMENT_LPAR + 1;
static final int TOK_TEXT_LPAR = TOK_PROCESSING_INSTRUCTION_LPAR + 1;
static final int TOK_NODE_LPAR = TOK_TEXT_LPAR + 1;
static final int TOK_MULTIPLY = TOK_NODE_LPAR + 1;
static final int TOK_LPAR = TOK_MULTIPLY + 1;
static final int TOK_RPAR = TOK_LPAR + 1;
static final int TOK_LSQB = TOK_RPAR + 1;
static final int TOK_RSQB = TOK_LSQB + 1;
static final int TOK_LITERAL = TOK_RSQB + 1;
static final int TOK_NUMBER = TOK_LITERAL + 1;
static final int TOK_AXIS = TOK_NUMBER + 1;
static final int TOK_FUNCTION_LPAR = TOK_AXIS + 1;
static final int TOK_CNAME_LPAR = TOK_FUNCTION_LPAR + 1;
static final int TOK_VARIABLE_REF = TOK_CNAME_LPAR + 1;
static final int TOK_SLASH = TOK_VARIABLE_REF + 1;
static final int TOK_SLASH_SLASH = TOK_SLASH + 1;
static final int TOK_VBAR = TOK_SLASH_SLASH + 1;
static final int TOK_COMMA = TOK_VBAR + 1;
static final int TOK_PLUS = TOK_COMMA + 1;
static final int TOK_MINUS = TOK_PLUS + 1;
static final int TOK_EQUALS = TOK_MINUS + 1;
static final int TOK_NOT_EQUALS = TOK_EQUALS + 1;
static final int TOK_GT = TOK_NOT_EQUALS + 1;
static final int TOK_LT = TOK_GT + 1;
static final int TOK_GTE = TOK_LT + 1;
static final int TOK_LTE = TOK_GTE + 1;
static final int TOK_AND = TOK_LTE + 1;
static final int TOK_OR = TOK_AND + 1;
static final int TOK_MOD = TOK_OR + 1;
static final int TOK_DIV = TOK_MOD + 1;
int currentToken = TOK_EOF;
String currentTokenValue = null;
private int currentTokenStartIndex = 0;
private final String expr;
private int exprIndex = 0;
private int exprLength;
private boolean recognizeOperator = false;
ExprTokenizer(String s) {
this.expr = s;
this.exprLength = s.length();
}
void next() throws ParseException {
currentTokenValue = null;
currentTokenStartIndex = exprIndex;
boolean currentMaybeOperator = recognizeOperator;
recognizeOperator = true;
for (;;) {
if (exprIndex >= exprLength) {
currentToken = TOK_EOF;
return;
}
char c = expr.charAt(exprIndex++);
switch (c) {
case ' ':
case '\t':
case '\r':
case '\n':
currentTokenStartIndex = exprIndex;
break;
case '<':
recognizeOperator = false;
if (exprIndex < exprLength && expr.charAt(exprIndex) == '=') {
exprIndex++;
currentToken = TOK_LTE;
}
else
currentToken = TOK_LT;
return;
case '>':
recognizeOperator = false;
if (exprIndex < exprLength && expr.charAt(exprIndex) == '=') {
exprIndex++;
currentToken = TOK_GTE;
}
else
currentToken = TOK_GT;
return;
case '/':
recognizeOperator = false;
if (exprIndex < exprLength && expr.charAt(exprIndex) == '/') {
exprIndex++;
currentToken = TOK_SLASH_SLASH;
}
else
currentToken = TOK_SLASH;
return;
case '=':
recognizeOperator = false;
currentToken = TOK_EQUALS;
return;
case '!':
if (exprIndex < exprLength && expr.charAt(exprIndex) == '=') {
exprIndex++;
currentToken = TOK_NOT_EQUALS;
recognizeOperator = false;
return;
}
throw new ParseException("illegal character");
case ',':
recognizeOperator = false;
currentToken = TOK_COMMA;
return;
case '|':
recognizeOperator = false;
currentToken = TOK_VBAR;
return;
case '+':
recognizeOperator = false;
currentToken = TOK_PLUS;
return;
case '-':
recognizeOperator = false;
currentToken = TOK_MINUS;
return;
case '(':
currentToken = TOK_LPAR;
recognizeOperator = false;
return;
case ')':
currentToken = TOK_RPAR;
return;
case '[':
currentToken = TOK_LSQB;
recognizeOperator = false;
return;
case ']':
currentToken = TOK_RSQB;
return;
case '"':
case '\'':
exprIndex = expr.indexOf(c, exprIndex);
if (exprIndex < 0) {
exprIndex = currentTokenStartIndex + 1;
throw new ParseException("missing quote");
}
currentTokenValue = expr.substring(currentTokenStartIndex + 1,
exprIndex++);
currentToken = TOK_LITERAL;
return;
case '$':
scanName();
if (exprIndex == currentTokenStartIndex + 1)
throw new ParseException("illegal character");
currentTokenValue = expr.substring(currentTokenStartIndex + 1,
exprIndex);
currentToken = TOK_VARIABLE_REF;
return;
case '*':
if (currentMaybeOperator) {
recognizeOperator = false;
currentToken = TOK_MULTIPLY;
}
else
currentToken = TOK_STAR;
return;
case '@':
currentToken = TOK_AT;
recognizeOperator = false;
return;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
scanDigits();
if (exprIndex + 1 < exprLength
&& expr.charAt(exprIndex) == '.'
&& isDigit(expr.charAt(exprIndex + 1))) {
exprIndex += 2;
scanDigits();
}
currentTokenValue = expr.substring(currentTokenStartIndex,
exprIndex);
currentToken = TOK_NUMBER;
return;
case '.':
if (exprIndex < exprLength && isDigit(expr.charAt(exprIndex))) {
++exprIndex;
scanDigits();
currentTokenValue = expr.substring(currentTokenStartIndex,
exprIndex);
currentToken = TOK_NUMBER;
return;
}
if (exprIndex < exprLength && expr.charAt(exprIndex) == '.') {
exprIndex++;
currentToken = TOK_DOT_DOT;
}
else
currentToken = TOK_DOT;
recognizeOperator = false;
return;
default:
--exprIndex;
scanName();
if (exprIndex == currentTokenStartIndex)
throw new ParseException("illegal character");
if (isAxis()) {
recognizeOperator = false;
currentToken = TOK_AXIS;
return;
}
if (exprIndex < exprLength && expr.charAt(exprIndex) == ':') {
exprIndex++;
if (exprIndex < exprLength && expr.charAt(exprIndex) == '*') {
currentTokenValue = expr.substring(currentTokenStartIndex,
exprIndex++ - 1);
currentToken = TOK_NAME_COLON_STAR;
return;
}
scanName();
if (expr.charAt(exprIndex - 1) == ':')
throw new ParseException("bad character after :");
currentTokenValue = expr.substring(currentTokenStartIndex,
exprIndex);
if (followingParen()) {
recognizeOperator = false;
currentToken = TOK_CNAME_LPAR;
}
else
currentToken = TOK_QNAME;
return;
}
currentTokenValue = expr.substring(currentTokenStartIndex,
exprIndex);
if (currentMaybeOperator) {
if (currentTokenValue.equals("and"))
currentToken = TOK_AND;
else if (currentTokenValue.equals("or"))
currentToken = TOK_OR;
else if (currentTokenValue.equals("mod"))
currentToken = TOK_MOD;
else if (currentTokenValue.equals("div"))
currentToken = TOK_DIV;
else
throw new ParseException("unrecognized operator name");
recognizeOperator = false;
return;
}
if (followingParen()) {
if (currentTokenValue.equals("processing-instruction"))
currentToken = TOK_PROCESSING_INSTRUCTION_LPAR;
else if (currentTokenValue.equals("comment"))
currentToken = TOK_COMMENT_LPAR;
else if (currentTokenValue.equals("node"))
currentToken = TOK_NODE_LPAR;
else if (currentTokenValue.equals("text"))
currentToken = TOK_TEXT_LPAR;
else
currentToken = TOK_FUNCTION_LPAR;
recognizeOperator = false;
}
else
currentToken = TOK_QNAME;
return;
}
}
}
private void scanName() {
if (exprIndex < exprLength
&& isNameStartChar(expr.charAt(exprIndex)))
while (++exprIndex < exprLength
&& isNameChar(expr.charAt(exprIndex)))
;
}
private void scanDigits() {
while (exprIndex < exprLength && isDigit(expr.charAt(exprIndex)))
exprIndex++;
}
private boolean followingParen() {
for (int i = exprIndex; i < exprLength; i++) {
switch (expr.charAt(i)) {
case '(':
exprIndex = i + 1;
return true;
case ' ':
case '\r':
case '\n':
case '\t':
break;
default:
return false;
}
}
return false;
}
private boolean isAxis() {
for (int i = exprIndex; i < exprLength; i++) {
switch (expr.charAt(i)) {
case ':':
if (i + 1 < exprLength && expr.charAt(i + 1) == ':') {
currentTokenValue = expr.substring(currentTokenStartIndex,
exprIndex);
exprIndex = i + 2;
return true;
}
break;
case ' ':
case '\r':
case '\n':
case '\t':
break;
default:
return false;
}
}
return false;
}
static private final String nameStartChars =
"_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
static private final String nameChars = ".-0123456789";
static private final String digits = "0123456789";
private static final boolean isDigit(char c) {
return digits.indexOf(c) >= 0;
}
private static final boolean isSpace(char c) {
switch(c) {
case ' ':
case '\r':
case '\n':
case '\t':
return true;
}
return false;
}
private static final boolean isNameStartChar(char c) {
return nameStartChars.indexOf(c) >= 0 || c >= 0x80;
}
private static final boolean isNameChar(char c) {
return nameStartChars.indexOf(c) >= 0 || nameChars.indexOf(c) >= 0 || c >= 0x80;
}
}
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