From 373c245f049896c60c91a829e60e95fff309757f Mon Sep 17 00:00:00 2001
From: Sander Hautvast <shautvast@ilionx.com>
Date: Thu, 17 May 2018 16:03:44 +0200
Subject: [PATCH] initial

---
 .gitignore            |   3 +
 .idea/misc.xml        |  12 ++
 .idea/modules.xml     |   8 +
 .idea/vcs.xml         |   6 +
 .idea/workspace.xml   | 438 ++++++++++++++++++++++++++++++++++++++++++
 Cargo.lock            |   4 +
 Cargo.toml            |   6 +
 expression_parser.iml |  15 ++
 src/main.rs           | 113 +++++++++++
 9 files changed, 605 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 .idea/misc.xml
 create mode 100644 .idea/modules.xml
 create mode 100644 .idea/vcs.xml
 create mode 100644 .idea/workspace.xml
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 expression_parser.iml
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0196246
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+
+/target/
+**/*.rs.bk
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..2f8f269
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CargoProjects">
+    <cargoProject FILE="$PROJECT_DIR$/Cargo.toml" />
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_3">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+  <component name="RustProjectSettings">
+    <option name="toolchainHomeDirectory" value="$USER_HOME$/.cargo/bin" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..92ceafd
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/expression_parser.iml" filepath="$PROJECT_DIR$/expression_parser.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
new file mode 100644
index 0000000..db095f2
--- /dev/null
+++ b/.idea/workspace.xml
@@ -0,0 +1,438 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ChangeListManager">
+    <list default="true" id="373b1af8-54ec-4d65-b233-88a2ee356985" name="Default" comment="" />
+    <ignored path="$PROJECT_DIR$/target/" />
+    <ignored path="$PROJECT_DIR$/out/" />
+    <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
+    <option name="TRACKING_ENABLED" value="true" />
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="FileEditorManager">
+    <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
+      <file leaf-file-name="main.rs" pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/src/main.rs">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="135">
+              <caret line="11" column="18" lean-forward="true" selection-start-line="11" selection-start-column="18" selection-end-line="11" selection-end-column="18" />
+              <folding>
+                <element signature="e#360#361#0" expanded="true" />
+                <element signature="e#398#399#0" expanded="true" />
+                <element signature="e#429#430#0" expanded="true" />
+                <element signature="e#461#462#0" expanded="true" />
+              </folding>
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file leaf-file-name="Cargo.toml" pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/Cargo.toml">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="90">
+              <caret line="6" column="0" lean-forward="true" selection-start-line="6" selection-start-column="0" selection-end-line="6" selection-end-column="0" />
+              <folding />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file leaf-file-name="result.rs" pinned="false" current-in-tab="false">
+        <entry file="file://$USER_HOME$/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/src/rust/src/libcore/result.rs">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="3825">
+              <caret line="255" column="9" lean-forward="false" selection-start-line="255" selection-start-column="9" selection-end-line="255" selection-end-column="9" />
+              <folding />
+            </state>
+          </provider>
+        </entry>
+      </file>
+    </leaf>
+  </component>
+  <component name="FindInProjectRecents">
+    <findStrings>
+      <find>'(</find>
+      <find>self.ch</find>
+    </findStrings>
+    <replaceStrings>
+      <replace>self.peek()</replace>
+    </replaceStrings>
+  </component>
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
+  </component>
+  <component name="GradleLocalSettings">
+    <option name="modificationStamps">
+      <map>
+        <entry key="$USER_HOME$/IdeaProjects/SyntheticJsonSerializer" value="1470081512000" />
+      </map>
+    </option>
+    <option name="externalProjectsViewState">
+      <projects_view />
+    </option>
+  </component>
+  <component name="IdeDocumentHistory">
+    <option name="CHANGED_PATHS">
+      <list>
+        <option value="$PROJECT_DIR$/src/main.rs" />
+      </list>
+    </option>
+  </component>
+  <component name="JsBuildToolGruntFileManager" detection-done="true" sorting="DEFINITION_ORDER" />
+  <component name="JsBuildToolPackageJson" detection-done="true" sorting="DEFINITION_ORDER" />
+  <component name="JsGulpfileManager">
+    <detection-done>true</detection-done>
+    <sorting>DEFINITION_ORDER</sorting>
+  </component>
+  <component name="ProjectFrameBounds" fullScreen="true">
+    <option name="y" value="23" />
+    <option name="width" value="1440" />
+    <option name="height" value="877" />
+  </component>
+  <component name="ProjectView">
+    <navigator currentView="ProjectPane" proportions="" version="1">
+      <flattenPackages />
+      <showMembers />
+      <showModules />
+      <showLibraryContents />
+      <hideEmptyPackages />
+      <abbreviatePackageNames />
+      <autoscrollToSource />
+      <autoscrollFromSource ProjectPane="true" />
+      <sortByType />
+      <manualOrder />
+      <foldersAlwaysOnTop value="true" />
+    </navigator>
+    <panes>
+      <pane id="PackagesPane" />
+      <pane id="ProjectPane">
+        <subPane>
+          <expand>
+            <path>
+              <item name="ExpressionParser" type="b2602c69:ProjectViewProjectNode" />
+              <item name="ExpressionParser" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="ExpressionParser" type="b2602c69:ProjectViewProjectNode" />
+              <item name="ExpressionParser" type="462c0819:PsiDirectoryNode" />
+              <item name="src" type="462c0819:PsiDirectoryNode" />
+            </path>
+          </expand>
+          <select />
+        </subPane>
+      </pane>
+      <pane id="Scope" />
+      <pane id="Scratches" />
+    </panes>
+  </component>
+  <component name="PropertiesComponent">
+    <property name="settings.editor.selected.configurable" value="preferences.sourceCode" />
+    <property name="settings.editor.splitter.proportion" value="0.2" />
+    <property name="nodejs_interpreter_path.stuck_in_default_project" value="/usr/local/bin/node" />
+    <property name="WebServerToolWindowFactoryState" value="false" />
+    <property name="aspect.path.notification.shown" value="true" />
+    <property name="org.rust.cargo.project.model.PROJECT_DISCOVERY" value="true" />
+  </component>
+  <component name="RunDashboard">
+    <option name="ruleStates">
+      <list>
+        <RuleState>
+          <option name="name" value="ConfigurationTypeDashboardGroupingRule" />
+        </RuleState>
+        <RuleState>
+          <option name="name" value="StatusDashboardGroupingRule" />
+        </RuleState>
+      </list>
+    </option>
+  </component>
+  <component name="RunManager">
+    <configuration default="true" type="Applet" factoryName="Applet">
+      <option name="WIDTH" value="400" />
+      <option name="HEIGHT" value="300" />
+      <option name="POLICY_FILE" value="$APPLICATION_HOME_DIR$/bin/appletviewer.policy" />
+      <module />
+    </configuration>
+    <configuration default="true" type="Application" factoryName="Application">
+      <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
+      <option name="MAIN_CLASS_NAME" />
+      <option name="VM_PARAMETERS" />
+      <option name="PROGRAM_PARAMETERS" />
+      <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$" />
+      <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
+      <option name="ALTERNATIVE_JRE_PATH" />
+      <option name="ENABLE_SWING_INSPECTOR" value="false" />
+      <option name="ENV_VARIABLES" />
+      <option name="PASS_PARENT_ENVS" value="true" />
+      <module name="" />
+      <envs />
+    </configuration>
+    <configuration name="Run ExpressionParser" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
+      <option name="channel" value="DEFAULT" />
+      <option name="command" value="run --package ExpressionParser --bin ExpressionParser" />
+      <option name="nocapture" value="true" />
+      <option name="backtrace" value="FULL" />
+      <option name="workingDirectory" value="file://$PROJECT_DIR$" />
+      <envs />
+    </configuration>
+    <configuration default="true" type="JUnit" factoryName="JUnit">
+      <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
+      <module name="" />
+      <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
+      <option name="ALTERNATIVE_JRE_PATH" />
+      <option name="PACKAGE_NAME" />
+      <option name="MAIN_CLASS_NAME" />
+      <option name="METHOD_NAME" />
+      <option name="TEST_OBJECT" value="class" />
+      <option name="VM_PARAMETERS" value="-ea" />
+      <option name="PARAMETERS" />
+      <option name="WORKING_DIRECTORY" value="$MODULE_DIR$" />
+      <option name="ENV_VARIABLES" />
+      <option name="PASS_PARENT_ENVS" value="true" />
+      <option name="TEST_SEARCH_SCOPE">
+        <value defaultName="singleModule" />
+      </option>
+      <envs />
+      <patterns />
+    </configuration>
+    <configuration default="true" type="JetRunConfigurationType" factoryName="Kotlin">
+      <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
+      <option name="MAIN_CLASS_NAME" />
+      <option name="VM_PARAMETERS" />
+      <option name="PROGRAM_PARAMETERS" />
+      <option name="WORKING_DIRECTORY" />
+      <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
+      <option name="ALTERNATIVE_JRE_PATH" />
+      <option name="PASS_PARENT_ENVS" value="true" />
+      <module name="Expression_Parser" />
+      <envs />
+    </configuration>
+    <configuration default="true" type="Remote" factoryName="Remote">
+      <option name="USE_SOCKET_TRANSPORT" value="true" />
+      <option name="SERVER_MODE" value="false" />
+      <option name="SHMEM_ADDRESS" value="javadebug" />
+      <option name="HOST" value="localhost" />
+      <option name="PORT" value="5005" />
+    </configuration>
+    <configuration default="true" type="TestNG" factoryName="TestNG">
+      <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
+      <module name="" />
+      <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
+      <option name="ALTERNATIVE_JRE_PATH" />
+      <option name="SUITE_NAME" />
+      <option name="PACKAGE_NAME" />
+      <option name="MAIN_CLASS_NAME" />
+      <option name="METHOD_NAME" />
+      <option name="GROUP_NAME" />
+      <option name="TEST_OBJECT" value="CLASS" />
+      <option name="VM_PARAMETERS" value="-ea" />
+      <option name="PARAMETERS" />
+      <option name="WORKING_DIRECTORY" value="$MODULE_DIR$" />
+      <option name="OUTPUT_DIRECTORY" />
+      <option name="ANNOTATION_TYPE" />
+      <option name="ENV_VARIABLES" />
+      <option name="PASS_PARENT_ENVS" value="true" />
+      <option name="TEST_SEARCH_SCOPE">
+        <value defaultName="singleModule" />
+      </option>
+      <option name="USE_DEFAULT_REPORTERS" value="false" />
+      <option name="PROPERTIES_FILE" />
+      <envs />
+      <properties />
+      <listeners />
+    </configuration>
+    <configuration default="true" type="#org.jetbrains.idea.devkit.run.PluginConfigurationType" factoryName="Plugin">
+      <module name="" />
+      <option name="VM_PARAMETERS" value="-Xmx512m -Xms256m -XX:MaxPermSize=250m -ea" />
+      <option name="PROGRAM_PARAMETERS" />
+      <predefined_log_file id="idea.log" enabled="true" />
+    </configuration>
+    <recent_temporary>
+      <list size="1">
+        <item index="0" class="java.lang.String" itemvalue="Cargo Command.Run ExpressionParser" />
+      </list>
+    </recent_temporary>
+  </component>
+  <component name="SbtLocalSettings">
+    <option name="externalProjectsViewState">
+      <projects_view />
+    </option>
+  </component>
+  <component name="ShelveChangesManager" show_recycled="false">
+    <option name="remove_strategy" value="false" />
+  </component>
+  <component name="SvnConfiguration">
+    <configuration />
+  </component>
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="373b1af8-54ec-4d65-b233-88a2ee356985" name="Default" comment="" />
+      <created>1518350162499</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1518350162499</updated>
+      <workItem from="1518350164160" duration="8607000" />
+      <workItem from="1518362096655" duration="32000" />
+      <workItem from="1518362147950" duration="2171000" />
+      <workItem from="1520084439674" duration="1289000" />
+      <workItem from="1520281844198" duration="6481000" />
+    </task>
+    <servers />
+  </component>
+  <component name="TimeTrackingManager">
+    <option name="totallyTimeSpent" value="33172000" />
+  </component>
+  <component name="ToolWindowManager">
+    <frame x="0" y="0" width="1440" height="900" extended-state="0" />
+    <editor active="true" />
+    <layout>
+      <window_info id="Palette" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
+      <window_info id="TODO" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="6" side_tool="false" content_ui="tabs" />
+      <window_info id="Cargo" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
+      <window_info id="Palette&#9;" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
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+      <window_info id="Debug" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.4" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
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+      <window_info id="Hierarchy" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="2" side_tool="false" content_ui="combo" />
+      <window_info id="Find" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
+    </layout>
+  </component>
+  <component name="TypeScriptGeneratedFilesManager">
+    <option name="version" value="1" />
+  </component>
+  <component name="VcsContentAnnotationSettings">
+    <option name="myLimit" value="2678400000" />
+  </component>
+  <component name="XDebuggerManager">
+    <breakpoint-manager />
+    <watches-manager />
+  </component>
+  <component name="editorHistoryManager">
+    <entry file="file://$PROJECT_DIR$/src/main.rs">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="0">
+          <caret line="0" column="0" lean-forward="false" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
+          <folding>
+            <element signature="e#360#361#0" expanded="true" />
+            <element signature="e#398#399#0" expanded="true" />
+            <element signature="e#429#430#0" expanded="true" />
+            <element signature="e#461#462#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main.rs">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="0">
+          <caret line="0" column="0" lean-forward="false" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
+          <folding>
+            <element signature="e#360#361#0" expanded="true" />
+            <element signature="e#398#399#0" expanded="true" />
+            <element signature="e#429#430#0" expanded="true" />
+            <element signature="e#461#462#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$USER_HOME$/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/src/rust/src/libcore/result.rs">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="3825">
+          <caret line="255" column="9" lean-forward="false" selection-start-line="255" selection-start-column="9" selection-end-line="255" selection-end-column="9" />
+          <folding />
+        </state>
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\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..a41ce75
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,4 @@
+[[package]]
+name = "ExpressionParser"
+version = "0.1.0"
+
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..8934ebc
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "ExpressionParser"
+version = "0.1.0"
+authors = ["Sander Hautvast <shautvast@ilionx.com>"]
+
+[dependencies]
diff --git a/expression_parser.iml b/expression_parser.iml
new file mode 100644
index 0000000..7fe828a
--- /dev/null
+++ b/expression_parser.iml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="RUST_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/examples" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/tests" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/benches" isTestSource="true" />
+      <excludeFolder url="file://$MODULE_DIR$/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..30661f8
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,113 @@
+use std::iter::Peekable;
+use std::str::Chars;
+
+fn main() {
+    println!("{:?}", parse("1+2*62+sin(90)" ));
+}
+
+pub fn parse(exp: &str) -> f64 {
+    let mut parser = Parser {
+        expr: &mut exp.chars().peekable(),
+    };
+    parser.parse()
+}
+
+struct Parser<'a> {
+    expr: &'a mut Peekable<Chars<'a>>,
+}
+
+impl<'a> Parser<'a> {
+    fn parse(&mut self) -> f64 {
+        self.parse_expression()
+    }
+
+    fn next_char(&mut self) {
+        self.expr.next();
+    }
+
+    fn eat(&mut self, char_to_eat: char) -> bool {
+        while self.peek() == ' ' {
+            self.next_char();
+        }
+        if self.peek() == char_to_eat {
+            self.next_char();
+            return true;
+        }
+        false
+    }
+
+    fn peek(&mut self) -> char{
+        match self.expr.peek() {
+            Some(e) => { *e }
+            None => '\u{0}'
+        }
+    }
+
+    fn parse_expression(&mut self) -> f64 {
+        let mut x = self.parse_term();
+        loop {
+            if self.eat('+') {
+                x += self.parse_term();
+            } else if self.eat('-') {
+                x -= self.parse_term();
+            } else { return x; }
+        }
+    }
+
+    fn parse_term(&mut self) -> f64 {
+        let mut x = self.parse_factor();
+        loop {
+            if self.eat('*') {
+                x *= self.parse_factor();
+            } else if self.eat('/') {
+                x /= self.parse_factor();
+            } else { return x; }
+        }
+    }
+
+    fn parse_factor(&mut self) -> f64 {
+        if self.eat('+') {
+            return self.parse_factor(); // unary plus
+        }
+        if self.eat('-') {
+            return -self.parse_factor(); // unary minus
+        }
+        let mut x: f64;
+
+        if self.eat('(') { // parentheses
+            x = self.parse_expression();
+            self.eat(')');
+        } else if self.peek().is_numeric() || self.peek() == '.' { // numbers
+            let mut buffer = String::new();
+
+            while self.peek().is_numeric() || self.peek() == '.' {
+                buffer.push(self.peek());
+                self.next_char();
+            }
+
+            x = buffer.parse().unwrap();
+        } else if self.peek().is_alphabetic() { // functions
+            let mut func = String::new();
+            while self.peek().is_alphabetic() {
+                func.push(self.peek());
+                self.next_char();
+            }
+
+            x = self.parse_factor();
+            x = match func.as_str(){
+                "sqrt" => x.sqrt(),
+                "sin" => x.to_radians().sin(),
+                "cos" => x.to_radians().cos(),
+                "tan" => x.to_radians().tan(),
+                _ => panic!(format!("Unknown function: {}", func))
+            };
+        } else {
+            panic!(format!("Unexpected: {}", self.peek()));
+        }
+
+        if self.eat('^') {
+            x = x.powf(self.parse_factor()); // exponentiation
+        }
+        x
+    }
+}
\ No newline at end of file