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Verbs.java
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Verbs.java
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/*
* Copyright (c) 2013-2024, xembly.org
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met: 1) Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer. 2) Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution. 3) Neither the name of the xembly.org nor
* the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.xembly;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;
import java.util.Optional;
import java.util.function.BiFunction;
import java.util.function.Function;
/**
* Directives in plain text.
* @since 0.24
*/
@SuppressWarnings({"PMD.GodClass", "PMD.InefficientEmptyStringCheck"})
final class Verbs {
/**
* Commands without arguments.
*/
@SuppressWarnings("PMD.NonStaticInitializer")
private static final Map<String, Callback<Directive>> ARGUMENTLESS =
new HashMap<String, Callback<Directive>>() {{
put("REMOVE", RemoveDirective::new);
put("UP", UpDirective::new);
put("PUSH", PushDirective::new);
put("POP", PopDirective::new);
}};
/**
* Commands with one argument.
*/
@SuppressWarnings("PMD.NonStaticInitializer")
private static final Map<String, Function<String, Callback<Directive>>> SIMPLE =
new HashMap<String, Function<String, Callback<Directive>>>() {{
put("XPATH", value -> () -> new XpathDirective(value));
put("SET", value -> () -> new SetDirective(value));
put("XSET", value -> () -> new XsetDirective(value));
put("ADD", value -> () -> new AddDirective(value));
put("ADDIF", value -> () -> new AddIfDirective(value));
put("STRICT", value -> () -> new StrictDirective(Integer.parseInt(value)));
put("CDATA", value -> () -> new CdataDirective(value));
put("COMMENT", value -> () -> new CommentDirective(value));
}};
/**
* Commands with two arguments.
*/
@SuppressWarnings("PMD.NonStaticInitializer")
private static final Map<String, BiFunction<String, String, Callback<Directive>>> COMPLEX =
new HashMap<String, BiFunction<String, String, Callback<Directive>>>() {{
put("ATTR", (attr, value) -> () -> new AttrDirective(attr, value));
put("XATTR", (attr, value) -> () -> new XattrDirective(attr, value));
put("PI", (target, data) -> () -> new PiDirective(target, data));
}};
/**
* Text.
*/
private final String text;
/**
* Directives.
*/
private final Collection<Directive> dirs;
/**
* Ctor.
* @param txt Text to parse
*/
Verbs(final String txt) {
this.text = txt;
this.dirs = new LinkedList<>();
}
/**
* Parse directives from text.
* @return Directives from text
*/
public Iterable<Directive> directives() {
final String trimmed = this.text.trim();
if (!trimmed.isEmpty()) {
final String semicolon = ";";
final StringBuilder builder = new StringBuilder();
Optional<Callback<Directive>> command;
try {
for (final String part : trimmed.split(semicolon)) {
if (builder.length() == 0) {
builder.append(Verbs.ltrim(part));
} else {
builder.append(part);
}
command = Verbs.parsedCommand(builder.toString());
if (command.isPresent()) {
this.dirs.add(command.get().call());
builder.setLength(0);
} else {
builder.append(semicolon);
}
}
} catch (final XmlContentException | ParsingException ex) {
throw new SyntaxException(
String.format(
"Parsing failed as %s: \"%s\"",
ex.getClass().getCanonicalName(),
ex.getLocalizedMessage()
),
ex
);
}
}
return this.dirs;
}
/**
* Try to parse Xembly command.
* @param part Part of the command
* @return Command or empty
* @throws XmlContentException If fails to un-escape all XML symbols
* @throws ParsingException If fails to parse given command
*/
private static Optional<Callback<Directive>> parsedCommand(final String part)
throws XmlContentException, ParsingException {
final Optional<Callback<Directive>> cmd;
final String trimmed = Verbs.withoutNumber(part.trim());
if (Verbs.ARGUMENTLESS.containsKey(trimmed)) {
cmd = Optional.of(Verbs.ARGUMENTLESS.get(trimmed));
} else {
final int index = Verbs.nearQuoteIndex(part);
final String command = Verbs.withoutNumber(part.substring(0, index).trim());
if (Verbs.SIMPLE.containsKey(command)) {
cmd = Verbs.simpleCommand(part, command, index);
} else if (Verbs.COMPLEX.containsKey(command)) {
cmd = Verbs.complexCommand(part, command, index);
} else {
throw new ParsingException(
String.format("Unknown command near [%s;]", part)
);
}
}
return cmd;
}
/**
* Get command without number in front.
* @param command Command to process
* @return Command without number in front
*/
private static String withoutNumber(final String command) {
final int index = command.indexOf(':');
final String cmd;
if (index == -1) {
cmd = command;
} else {
cmd = Verbs.ltrim(command.substring(index + 1));
}
return cmd;
}
/**
* Get index of the nearest left single or double quote in the given command.
* @param part Part of the command to process
* @return Index of nearest quote
* @throws ParsingException If fails to find quotes in the part of the command
*/
private static int nearQuoteIndex(final String part) throws ParsingException {
final int single = part.indexOf('\'');
final int dual = part.indexOf('"');
if (single == -1 && dual == -1) {
throw new ParsingException(
String.format("Couldn't find quote in the part of the command near [%s;]", part)
);
}
final int index;
if (single != -1 && (dual == -1 || single < dual)) {
index = single;
} else if (single == -1 || dual < single) {
index = dual;
} else {
throw new ParsingException(
String.format("Unexpected behaviour when searching for quotes near [%s;]", part)
);
}
return index;
}
/**
* Try to parse command with one argument.
* @param part Full command part
* @param command Command itself
* @param index Index of nearest quote
* @return Simple command or empty
* @throws XmlContentException If fails to un-escape all XML symbols in command argument
* @throws ParsingException If fails to parse simple command
*/
private static Optional<Callback<Directive>> simpleCommand(
final String part,
final String command,
final int index
) throws XmlContentException, ParsingException {
final char quote = part.charAt(index);
final String[] args = part.split(String.valueOf(quote));
final Optional<Callback<Directive>> cmd;
if (args.length == 1) {
cmd = Optional.empty();
} else if (args.length == 2) {
if (part.charAt(part.length() - 1) == quote) {
cmd = Optional.of(
Verbs.SIMPLE.get(command).apply(
Arg.unescape(String.format("'%s'", args[1]))
)
);
} else {
cmd = Optional.empty();
}
} else if (args.length == 3) {
if (args[2].trim().isEmpty()) {
cmd = Optional.of(
Verbs.SIMPLE.get(command).apply(
Arg.unescape(String.format("'%s'", args[1]))
)
);
} else {
throw new ParsingException(
String.format("Unexpected symbols after command argument near [%s;]", part)
);
}
} else {
throw new ParsingException(
String.format(
"Unexpected behaviour when searching for command arguments [%s;]", part
)
);
}
return cmd;
}
/**
* Try to parse command with two arguments.
* @param part Full command part
* @param command Command itself
* @param index Index of nearest quote
* @return Complex command or empty
* @throws XmlContentException If fails to un-escape all XML symbols in command arguments
* @throws ParsingException If fails to parse complex command
* @checkstyle CyclomaticComplexityCheck (100 lines)
* @checkstyle NestedIfDepthCheck (100 lines)
*/
private static Optional<Callback<Directive>> complexCommand(
final String part,
final String command,
final int index
) throws XmlContentException, ParsingException {
final char quote = part.charAt(index);
final String[] args = part.split(String.valueOf(quote));
final Optional<Callback<Directive>> cmd;
if (args.length == 1) {
cmd = Optional.empty();
} else if (args.length == 2) {
if (part.charAt(part.length() - 1) == quote) {
throw new ParsingException(
String.format("Unexpected last quote near [%s;]", part)
);
} else {
cmd = Optional.empty();
}
} else if (args.length > 2) {
String tail = Verbs.ltrim(
part.substring(index + part.substring(index + 1).indexOf(quote) + 2)
);
if (tail.isEmpty()) {
cmd = Optional.empty();
} else {
if (tail.charAt(0) != ',') {
throw new ParsingException(
String.format("Comma after first argument is expected near [%s;]", part)
);
}
tail = Verbs.ltrim(tail.substring(1));
if (tail.isEmpty()) {
throw new ParsingException(
String.format("Unexpected last semicolon near [%s;]", part)
);
}
final char first = tail.charAt(0);
if (first != '\'' && first != '"') {
throw new ParsingException(
String.format(
"Single or double quote is expected after comma near [%s;]", part
)
);
}
tail = tail.substring(1);
final int next = tail.indexOf(first);
if (next == -1) {
cmd = Optional.empty();
} else {
if (!tail.substring(next + 1).trim().isEmpty()) {
throw new ParsingException(
String.format(
"Unexpected symbols after second argument near [%s;]", part
)
);
}
cmd = Optional.of(
Verbs.COMPLEX.get(command).apply(
Arg.unescape(String.format("'%s'", args[1])),
Arg.unescape(String.format("'%s'", tail.substring(0, next)))
)
);
}
}
} else {
throw new ParsingException(
String.format(
"Unexpected behaviour when searching for command arguments [%s;]", part
)
);
}
return cmd;
}
/**
* Trim from left.
* @param str String to trim
* @return String trimmed from left
*/
private static String ltrim(final String str) {
int idx = 0;
while (idx < str.length() && Character.isWhitespace(str.charAt(idx))) {
++idx;
}
return str.substring(idx);
}
}