calculator grammar

calculator/README.md

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+# Calculator Grammar
+
+# Summary
+
+A simple ANTLR4 calculator grammar based on the khubla.com arithmetic grammar.  Calculator expands on arithmetic by adding functions, such as sin() and ln()
+
+The calculator example is intended of an example of how to parse geometric and algebraic expressions with ANTLR
+
+

calculator/calculator.g4

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+/*
+BSD License
+
+Copyright (c) 2013, Tom Everett
+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 Tom Everett 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.
+*/
+
+grammar calculator;
+
+expression  
+    : addingExpression ((relop) addingExpression)*
+    ;
+
+addingExpression 
+    : multiplyingExpression ((PLUS|MINUS) multiplyingExpression)*
+    ;
+
+multiplyingExpression  
+    : powExpression ((TIMES|DIV) powExpression)*
+    ;
+
+powExpression
+    : expExpression (POW expExpression)?
+    ;
+
+expExpression
+    : constantExpression (E number)?
+    ;
+
+constantExpression 
+    : number 
+    | variable
+    | LPAREN expression RPAREN
+    | func
+    ;
+
+func
+    : funcname LPAREN expression RPAREN
+    ;
+
+funcname
+    : COS | TAN | SIN | ACOS | ATAN | ASIN | LOG | LN
+    ;
+
+relop 
+    : EQ | GT | LT
+    ;
+
+number
+    : MINUS? digits (POINT digits)?
+    ;
+
+digits
+    : DIGIT+;
+
+variable
+    : MINUS? LETTER (LETTER | DIGIT)*;
+
+COS
+    : 'cos'
+    ;
+
+SIN
+    : 'sin'
+    ;
+
+TAN
+    : 'tan'
+    ;
+
+ACOS
+    : 'acos'
+    ;
+
+ASIN
+    : 'asin'
+    ;
+
+ATAN
+    : 'atan'
+    ;
+LN
+    : 'ln'
+    ;
+
+LOG
+    : 'log'
+    ;
+
+LPAREN 
+    : '('
+    ;
+
+RPAREN 
+    : ')'
+    ;
+
+PLUS 
+    : '+'
+    ;
+
+MINUS 
+    : '-'
+    ;
+
+TIMES 
+    : '*'
+    ;
+
+DIV 
+    : '/'
+    ;
+
+GT 
+    : '>'
+    ;
+
+LT 
+    : '<'
+    ;
+
+EQ
+    : '='
+    ;
+
+POINT
+    : '.'
+    ;
+
+E
+    : 'e'
+    | 'E'
+    ;
+
+POW
+    : '^'
+    ;
+
+LETTER
+    : ('a'..'z') | ('A'..'Z')
+    ;
+
+DIGIT
+    : ('0'..'9')
+    ;
+
+WS 
+    : [ \r\n\t]+ -> channel(HIDDEN)
+    ;

calculator/examples/pyth.txt

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+sin (x)^2 + cos(x)^2 = 1
+

calculator/examples/quadratic.txt

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+x  = (-b + (b^2 -4*a*c)^0.50) / 4*a*c
+
+

calculator/examples/snell.txt

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+sin (a1) / sin (a2) = v1 / v2
+

calculator/examples/tan.txt

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+tan (x) = sin(x) / cos (x)
+

calculator/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<artifactId>calculator</artifactId>
+	<packaging>jar</packaging>
+	<name>khubla.com Calculator grammar</name>
+	<parent>
+		<groupId>com.antlr.grammarsv4</groupId>
+		<artifactId>grammarsv4</artifactId>
+		<version>1.0-SNAPSHOT</version>
+		<relativePath>../pom.xml</relativePath>
+	</parent>
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.antlr</groupId>
+				<artifactId>antlr4-maven-plugin</artifactId>
+				<version>${antlr.version}</version>
+				<configuration>
+					<sourceDirectory>${basedir}</sourceDirectory>
+					<grammars>calculator.g4</grammars>
+				</configuration>
+				<executions>
+					<execution>
+						<goals>
+							<goal>antlr4</goal>
+						</goals>
+					</execution>
+				</executions>
+			</plugin>
+			<plugin>
+				<groupId>org.antlr</groupId>
+				<artifactId>antlr4test-maven-plugin</artifactId>
+				<configuration>
+					<verbose>false</verbose>
+					<showTree>true</showTree>
+					<entryPoint>expression</entryPoint>
+					<grammarName>calculator</grammarName>
+					<packageName></packageName>
+					<exampleFiles>examples/</exampleFiles>
+				</configuration>
+				<executions>
+					<execution>
+						<goals>
+							<goal>test</goal>
+						</goals>
+					</execution>
+				</executions>
+			</plugin>
+		</plugins>
+	</build>
+</project>

pom.xml

@@ -32,6 +32,7 @@
 		<module>erlang</module>
 		<module>lua</module>
                 <module>arithmetic</module>
+                <module>calculator</module>
 	</modules>
 	<properties>
 		<target.jvm>1.6</target.jvm>