diff --git a/src/lexer/lexer.sols b/src/lexer/lexer.sols
index ce077ba..d6f64b0 100644
--- a/src/lexer/lexer.sols
+++ b/src/lexer/lexer.sols
@@ -1,16 +1,97 @@
 use collections
+use string
+
+//
+// Token type enum.
+//
+// Each token can be one of these types.
+//
+enum SolsToken {
+    Identifier, Literal, Type,
+    
+    Dot, OpenCurly, CloseCurly, OpenParen, CloseParen, Comma,
+
+    OpAdd, OpSub, OpMul, OpDiv, OpAddTo, OpSubTo, OpMulTo, OpDivTo, OpIncrement, OpDecrement, OpSet,
+    OpGreater, OpLesser, OpEqual, OpInequal, OpEqGreater, OpEqLesser,
+
+    KwDef, KwLambda, KwReturn, KwUse, KwStruct, KwEnum, KwConstructor,
+    KwDestructor, KwDuplicator, KwPrivate, KwProtected, KwPuts, KwIf,
+    KwWhile, KwNew, KwGround,
+
+    LineEnd,
+
+}
+
+//
+// Token type map.
+//
+// If a token matches one of the strings in this hashmap, 
+// its type gets set to the token type for that string.
+//
+KEYWORDS = Hashmap()
+KEYWORDS.set("puts", SolsToken.KwPuts)
+KEYWORDS.set("if", SolsToken.KwIf)
+KEYWORDS.set("while", SolsToken.KwWhile)
+KEYWORDS.set("def", SolsToken.KwDef)
+KEYWORDS.set("lambda", SolsToken.KwLambda)
+KEYWORDS.set("return", SolsToken.KwReturn)
+KEYWORDS.set("use", SolsToken.KwUse)
+KEYWORDS.set("struct", SolsToken.KwStruct)
+KEYWORDS.set("enum", SolsToken.KwEnum)
+KEYWORDS.set("constructor", SolsToken.KwConstructor)
+KEYWORDS.set("destructor", SolsToken.KwDestructor)
+KEYWORDS.set("duplicator", SolsToken.KwDuplicator)
+KEYWORDS.set("private", SolsToken.KwPrivate)
+KEYWORDS.set("protected", SolsToken.KwProtected)
+KEYWORDS.set("ground", SolsToken.KwGround)
+KEYWORDS.set("new", SolsToken.KwNew)
+KEYWORDS.set("{", SolsToken.OpenCurly)
+KEYWORDS.set("}", SolsToken.CloseCurly)
+KEYWORDS.set("(", SolsToken.OpenParen)
+KEYWORDS.set(")", SolsToken.CloseParen)
+KEYWORDS.set("+", SolsToken.OpAdd)
+KEYWORDS.set("-", SolsToken.OpSub)
+KEYWORDS.set("*", SolsToken.OpMul)
+KEYWORDS.set("/", SolsToken.OpDiv)
+KEYWORDS.set("=", SolsToken.OpSet)
+KEYWORDS.set("+=", SolsToken.OpAddTo)
+KEYWORDS.set("-=", SolsToken.OpSubTo)
+KEYWORDS.set("*=", SolsToken.OpMulTo)
+KEYWORDS.set("/=", SolsToken.OpDivTo)
+KEYWORDS.set("++", SolsToken.OpIncrement)
+KEYWORDS.set("--", SolsToken.OpDecrement)
+KEYWORDS.set("==", SolsToken.OpEqual)
+KEYWORDS.set("!=", SolsToken.OpInequal)
+KEYWORDS.set(">", SolsToken.OpGreater)
+KEYWORDS.set("<", SolsToken.OpLesser)
+KEYWORDS.set(">=", SolsToken.OpEqGreater)
+KEYWORDS.set("<=", SolsToken.OpEqLesser)
+KEYWORDS.set("\n", SolsToken.LineEnd)
+KEYWORDS.set(";", SolsToken.LineEnd)
+KEYWORDS.set(",", SolsToken.Comma)
 
 struct SolsLexer {
-    input = ""
+    sourceCode = "x = 123"
     current = 0
 
-    constructor(string input) {
-        self.input = input
+    private def getTokenType(string input) SolsToken {
+        return KEYWORDS.get(input)
     }
 
-    def lex() List {
-        output = List(1)
+    def lex() {
+        inString = false
 
-        return output
+        lineNum = 1
+        lineStart = 0
+        currentLine = ""
+
+        while lineStart < string_Length() {
+            
+        }
     }
-}
\ No newline at end of file
+}
+
+
+
+lexer = new SolsLexer
+puts lexer.getTokenType("if")
\ No newline at end of file
diff --git a/string/SUMMARY.md b/string/SUMMARY.md
new file mode 100644
index 0000000..5b29ed4
--- /dev/null
+++ b/string/SUMMARY.md
@@ -0,0 +1,37 @@
+# string
+The string library gives you access to a lot of functions that are necessary for doing anything useful with strings.  
+**Note:** The string in Ground library is called "strings" in Solstice.
+
+## Functions
+- [string_CharAt](docs/char_at.md)
+
+### Modifying Strings
+- [string_Upper](docs/modify/upper.md)
+- [string_Lower](docs/modify/lower.md)
+- [string_Trim](docs/modify/trim.md)
+- [string_TrimLeft](docs/modify/trim_left.md)
+- [string_TrimRight](docs/modify/trim_right.md)
+- [string_Substring](docs/modify/substring.md)
+- [string_Repeat](docs/modify/repeat.md)
+- [string_Replace](docs/modify/replace.md)
+- [string_Reverse](docs/modify/reverse.md)
+
+### Check For Substring
+- [string_StartsWith](docs/check/starts_with.md)
+- [string_EndsWith](docs/check/ends_with.md)
+- [string_Contains](docs/check/contains.md)
+
+### Find Substring
+- [string_Find](docs/find/find.md)
+- [string_FindLast](docs/find/find_last.md)
+- [string_Count](docs/find/count.md)
+
+### String Classification
+- [string_IsAlpha](docs/classify/is_alpha.md)
+- [string_IsAlnum](docs/classify/is_alnum.md)
+- [string_IsDigit](docs/classify/is_digit.md)
+- [string_IsSpace](docs/classify/is_space.md)
+
+## Changelog
+### v1.0.0 (latest)
+- Initial release.
diff --git a/string/docs/char_at.md b/string/docs/char_at.md
new file mode 100644
index 0000000..832bf11
--- /dev/null
+++ b/string/docs/char_at.md
@@ -0,0 +1,24 @@
+# string_CharAt
+Get character at index in string.
+
+## Arguments
+- str (string): string to get character of.
+- index (int): the index in the string you want to get.
+
+## Returns
+char (string): the character at the specified index in the string.
+
+## Raises
+- `OutOfBounds`: raised if you try accessing a string past its length or at a negative index.
+
+## Example
+### Ground
+```python
+call !string_CharAt "my string" 3 &char
+println $char # "s"
+```
+
+### Solstice
+```c
+puts string_CharAt("my string", 3) // "s"
+```
\ No newline at end of file
diff --git a/string/docs/check/contains.md b/string/docs/check/contains.md
new file mode 100644
index 0000000..6ac3178
--- /dev/null
+++ b/string/docs/check/contains.md
@@ -0,0 +1,25 @@
+# string_Contains
+Check if a string has another string in it.
+
+## Arguments
+- haystack (string): the string to check against.
+- needle (string): the string to look for.
+
+## Returns
+found (bool): returns `true` if `haystack` has `needle` inside it. 
+
+## Example
+### Ground
+```python
+call !string_Contains "The task was completed successfully." "success" &found
+println $found # true
+
+call !string_Contains "The task failed." "success" &found
+println $found # false
+```
+
+### Solstice
+```c
+puts string_Contains("The task was completed successfully.", "success") // true
+puts string_Contains("The task failed.", "success") // false
+```
\ No newline at end of file
diff --git a/string/docs/check/ends_with.md b/string/docs/check/ends_with.md
new file mode 100644
index 0000000..3c9fe2a
--- /dev/null
+++ b/string/docs/check/ends_with.md
@@ -0,0 +1,25 @@
+# string_EndsWith
+Check if a string has another string as a suffix.
+
+## Arguments
+- str (string): the string to check against.
+- suffix (string): the suffix to check for.
+
+## Returns
+hasSuffix (bool): returns `true` if `str` has the given `suffix` as a suffix, otherwise `false`.
+
+## Example
+### Ground
+```python
+call !string_EndsWith "file.txt" ".txt" &hasSuffix
+println $hasSuffix # true
+
+call !string_EndsWith "file.grnd" ".txt" &hasSuffix
+println $hasSuffix # false
+```
+
+### Solstice
+```c
+puts string_EndsWith("file.txt", ".txt") // true
+puts string_EndsWith("file.grnd", ".txt") // false
+```
\ No newline at end of file
diff --git a/string/docs/check/starts_with.md b/string/docs/check/starts_with.md
new file mode 100644
index 0000000..acd8095
--- /dev/null
+++ b/string/docs/check/starts_with.md
@@ -0,0 +1,25 @@
+# string_StartsWith
+Check if a string is prefixed by another string.
+
+## Arguments
+- str (string): the string to check against.
+- prefix (string): the prefix to check for.
+
+## Returns
+hasPrefix (bool): returns `true` if `str` is prefixed by the given `prefix`, otherwise `false`.
+
+## Example
+### Ground
+```python
+call !string_StartsWith "doc_someFile.txt" "doc_" &hasPrefix
+println $hasPrefix # true
+
+call !string_StartsWith "someFile.txt" "doc_" &hasPrefix
+println $hasPrefix # false
+```
+
+### Solstice
+```c
+puts string_StartsWith("doc_someFile.txt", "doc_") // true
+puts string_StartsWith("someFile.txt", "doc_") // false
+```
\ No newline at end of file
diff --git a/string/docs/classify/is_alnum.md b/string/docs/classify/is_alnum.md
new file mode 100644
index 0000000..5e2fab4
--- /dev/null
+++ b/string/docs/classify/is_alnum.md
@@ -0,0 +1,24 @@
+# string_IsAlnum
+Returns true if the given `string` is alphanumeric.
+
+## Arguments
+- str (string): the string to check.
+
+## Returns
+isAlnum (bool): returns `true` if `string` is alphanumeric, otherwise `false`.
+
+## Example
+### Ground
+```python
+call !string_IsAlnum "abc123" &isAlnum
+println $isAlnum # true
+
+call !string_IsAlnum "@$!ffasdf" &isAlnum
+println $isAlnum # false
+
+call !string_IsAlnum "1234" &isAlnum
+println $isAlnum # true
+
+call !string_IsAlnum "_" &isAlnum
+println $isAlnum # false
+```
\ No newline at end of file
diff --git a/string/docs/classify/is_alpha.md b/string/docs/classify/is_alpha.md
new file mode 100644
index 0000000..02577e2
--- /dev/null
+++ b/string/docs/classify/is_alpha.md
@@ -0,0 +1,24 @@
+# string_IsAlpha
+Returns true if the given `string` is only the letters a-Z.
+
+## Arguments
+- str (string): the string to check.
+
+## Returns
+isAlpha (bool): returns `true` if `string` is only the letters a-Z, otherwise `false`.
+
+## Example
+### Ground
+```python
+call !string_IsAlpha "abcABC" &isAlpha
+println $isAlpha # true
+
+call !string_IsAlpha "123" &isAlpha
+println $isAlpha # false
+
+call !string_IsAlpha "abc_$@" &isAlpha
+println $isAlpha # false
+
+call !string_IsAlpha "aAbBcCdDeEfF" &isAlpha
+println $isAlpha # true
+```
\ No newline at end of file
diff --git a/string/docs/classify/is_digit copy.md b/string/docs/classify/is_digit copy.md
new file mode 100644
index 0000000..e6b8ccf
--- /dev/null
+++ b/string/docs/classify/is_digit copy.md	
@@ -0,0 +1,24 @@
+# string_IsAlpha
+Returns true if the given `string` is only numbers.
+
+## Arguments
+- str (string): the string to check.
+
+## Returns
+isAlpha (bool): returns `true` if `string` is only numbers, otherwise `false`.
+
+## Example
+### Ground
+```python
+call !string_IsAlpha "65535" &isAlpha
+println $isAlpha # true
+
+call !string_IsAlpha "$!@/_ffff" &isAlpha
+println $isAlpha # false
+
+call !string_IsAlpha "1234" &isAlpha
+println $isAlpha # true
+
+call !string_IsAlpha "abcd123" &isAlpha
+println $isAlpha # false
+```
\ No newline at end of file
diff --git a/string/docs/classify/is_space.md b/string/docs/classify/is_space.md
new file mode 100644
index 0000000..6ee730f
--- /dev/null
+++ b/string/docs/classify/is_space.md
@@ -0,0 +1,24 @@
+# string_IsSpace
+Returns true if the given `string` is whitespace.
+
+## Arguments
+- str (string): the string to check.
+
+## Returns
+isAlpha (bool): returns `true` if `string` is whitespace, otherwise `false`.
+
+## Example
+### Ground
+```python
+call !string_IsAlpha "    " &isAlpha
+println $isAlpha # true
+
+call !string_IsAlpha " " &isAlpha
+println $isAlpha # true
+
+call !string_IsAlpha "abc_def" &isAlpha
+println $isAlpha # false
+
+call !string_IsAlpha "   a" &isAlpha
+println $isAlpha # false
+```
\ No newline at end of file
diff --git a/string/docs/find/count.md b/string/docs/find/count.md
new file mode 100644
index 0000000..02ba699
--- /dev/null
+++ b/string/docs/find/count.md
@@ -0,0 +1,21 @@
+# string_Count
+Count the number of times `needle` appears in `haystack`.
+
+## Arguments
+- haystack (string): the string to search through.
+- needle (string): the substring to count.
+
+## Returns
+count (int): the number of times `needle` appears in `haystack`.
+
+## Example
+### Ground
+```python
+call !string_Count "Hello, World!" "l" &count
+println $count # 3
+```
+
+### Solstice
+```c
+puts string_Count("Hello, World!", "l") // 3
+```
\ No newline at end of file
diff --git a/string/docs/find/find.md b/string/docs/find/find.md
new file mode 100644
index 0000000..99ed30b
--- /dev/null
+++ b/string/docs/find/find.md
@@ -0,0 +1,21 @@
+# string_Find
+Look for the first occurence of `needle` in `haystack` and return its index in the string. If it isn't found, return -1.
+
+## Arguments
+- haystack (string): the string to search.
+- needle (string): the substring to look for.
+
+## Returns
+index (int): the index of the first occurence of `needle` in `haystack`. If it isn't found, return -1.
+
+## Example
+### Ground
+```python
+call !string_Find "abcdefg" "d" &index
+println $index # 3
+```
+
+### Solstice
+```c
+puts string_Find("abcdefg", "d") // 3
+```
\ No newline at end of file
diff --git a/string/docs/find/find_last.md b/string/docs/find/find_last.md
new file mode 100644
index 0000000..35f772d
--- /dev/null
+++ b/string/docs/find/find_last.md
@@ -0,0 +1,21 @@
+# string_FindLast
+Look for the last occurence of `needle` in `haystack` and return its index in the string. If it isn't found, return -1.
+
+## Arguments
+- haystack (string): the string to search.
+- needle (string): the substring to look for.
+
+## Returns
+index (int): the index of the last occurence of `needle` in `haystack`. If it isn't found, return -1.
+
+## Example
+### Ground
+```python
+call !string_FindLast "abcabcabc" "b" &index
+println $index # 7
+```
+
+### Solstice
+```c
+puts string_FindLast("abcabcabc", "b") // 7
+```
\ No newline at end of file
diff --git a/string/docs/modify/lower.md b/string/docs/modify/lower.md
new file mode 100644
index 0000000..c501c82
--- /dev/null
+++ b/string/docs/modify/lower.md
@@ -0,0 +1,23 @@
+# string_Lower
+Make a string lowercase.
+
+## Arguments
+- str (string): the string to make lowercase.
+
+## Returns
+lowerString (string): the string in lowercase.
+
+## Raises
+- `AllocFail`: raised if Ground failed to allocate memory for the new string.
+
+## Example
+### Ground
+```python
+call !string_Lower "my STRING" &lowerString
+println $lowerString # "my string"
+```
+
+### Solstice
+```c
+puts string_Lower("my STRING") // "my string"
+```
\ No newline at end of file
diff --git a/string/docs/modify/repeat.md b/string/docs/modify/repeat.md
new file mode 100644
index 0000000..091d351
--- /dev/null
+++ b/string/docs/modify/repeat.md
@@ -0,0 +1,24 @@
+# string_Repeat
+Repeat a string `times` times.
+
+## Arguments
+- str (string): the string to repeat.
+- times (int): the number of times to repeat the string.
+
+## Returns
+result (string): the string repeated the given number of times.
+
+## Raises
+- `AllocFail`: raised if Ground fails to allocate memory for the new string.
+
+## Example
+### Ground
+```python
+call !string_Repeat "hi " 5 &repeated
+println $repeated # "hi hi hi hi hi "
+```
+
+### Solstice
+```c
+puts string_Repeat("hi ", 5) // "hi hi hi hi hi "
+```
\ No newline at end of file
diff --git a/string/docs/modify/replace.md b/string/docs/modify/replace.md
new file mode 100644
index 0000000..c44b73a
--- /dev/null
+++ b/string/docs/modify/replace.md
@@ -0,0 +1,22 @@
+# string_Replace
+Replace all occurences of `from` in `str` with `to`.
+
+## Arguments
+- str (string): the string to run a find and replace on.
+- from (string): the substring you want to replace.
+- to (string): the thing to replace all occurences of `from` with.
+
+## Returns
+result (string): the resulting string after the find and replace.
+
+## Example
+### Ground
+```python
+call !string_Replace "abacabacacacabacacacabac" "c" "b" &result
+println $result # "abababababababababababab"
+```
+
+### Solstice
+```c
+puts string_Replace("abacabacacacabacacacabac", "c", "b") // "abababababababababababab"
+```
\ No newline at end of file
diff --git a/string/docs/modify/reverse.md b/string/docs/modify/reverse.md
new file mode 100644
index 0000000..2ac921c
--- /dev/null
+++ b/string/docs/modify/reverse.md
@@ -0,0 +1,23 @@
+# string_Reverse
+Get the reversed version of a string.
+
+## Arguments
+- str (string): the string to reverse.
+
+## Returns
+result (string): the reversed string.
+
+## Raises
+- `AllocFail`: raised if Ground failed to allocate memory for the new string.
+
+## Example
+### Ground
+```python
+call !string_Reverse "Hello, World!" &reverse
+println $reverse # "!dlroW, olleH"
+```
+
+### Solstice
+```c
+puts string_Reverse("Hello, World!") // "!dlroW, olleH"
+```
\ No newline at end of file
diff --git a/string/docs/modify/substring.md b/string/docs/modify/substring.md
new file mode 100644
index 0000000..e46940d
--- /dev/null
+++ b/string/docs/modify/substring.md
@@ -0,0 +1,27 @@
+# string_Substring
+Get a substring of a string.
+
+## Arguments
+- str (string): the string to get a substring of.
+- start (int): starting index of the substring.
+- end (int): ending index of the substring.
+
+## Returns
+substring (string): the substring of the given string.
+
+## Raises
+- `AllocFail`: raised if Ground failed to allocate memory for the new string.
+- `EndBeforeStart`: raised if the `end` index is less than the `start` index.
+- `OutOfBounds`: raised if either the `end` or `start` index is outside the bounds of the string.
+
+## Example
+### Ground
+```python
+call !string_Substring "Hello, World!" 1 3 &sub
+println $sub # "ell"
+```
+
+### Solstice
+```c
+puts string_Substring("Hello, World!", 1, 3) // "ell"
+```
\ No newline at end of file
diff --git a/string/docs/modify/trim.md b/string/docs/modify/trim.md
new file mode 100644
index 0000000..88e822b
--- /dev/null
+++ b/string/docs/modify/trim.md
@@ -0,0 +1,23 @@
+# string_Trim
+Trim whitespace from both sides of a string.
+
+## Arguments
+- str (string): the string to trim.
+
+## Returns
+trimmed (string): the string with its whitespace removed.
+
+## Raises
+- `AllocFail`: raised if Ground failed to allocate memory for the new string.
+
+## Example
+### Ground
+```python
+call !string_Trim "   aaabbb  " &trimmed
+println $trimmed # "aaabbb"
+```
+
+### Solstice
+```c
+puts string_Trim("   aaabbb  ") // "aaabbb"
+```
\ No newline at end of file
diff --git a/string/docs/modify/trim_left.md b/string/docs/modify/trim_left.md
new file mode 100644
index 0000000..add1055
--- /dev/null
+++ b/string/docs/modify/trim_left.md
@@ -0,0 +1,23 @@
+# string_TrimLeft
+Trim whitespace from the left side of a string.
+
+## Arguments
+- str (string): the string to trim.
+
+## Returns
+trimmed (string): the string with the whitespace removed on the left side.
+
+## Raises
+- `AllocFail`: raised if Ground failed to allocate memory for the new string.
+
+## Example
+### Ground
+```python
+call !string_TrimLeft "   aaabbb  " &trimmed
+println $trimmed # "aaabbb  "
+```
+
+### Solstice
+```c
+puts string_TrimLeft("   aaabbb  ") // "aaabbb  "
+```
\ No newline at end of file
diff --git a/string/docs/modify/trim_right.md b/string/docs/modify/trim_right.md
new file mode 100644
index 0000000..f884b03
--- /dev/null
+++ b/string/docs/modify/trim_right.md
@@ -0,0 +1,23 @@
+# string_TrimRight
+Trim whitespace from the right side of a string.
+
+## Arguments
+- str (string): the string to trim.
+
+## Returns
+trimmed (string): the string with the whitespace removed on the right side.
+
+## Raises
+- `AllocFail`: raised if Ground failed to allocate memory for the new string.
+
+## Example
+### Ground
+```python
+call !string_TrimRight "   aaabbb  " &trimmed
+println $trimmed # "   aaabbb"
+```
+
+### Solstice
+```c
+puts string_TrimRight("   aaabbb  ") // "   aaabbb"
+```
\ No newline at end of file
diff --git a/string/docs/modify/upper.md b/string/docs/modify/upper.md
new file mode 100644
index 0000000..5e7a5d1
--- /dev/null
+++ b/string/docs/modify/upper.md
@@ -0,0 +1,23 @@
+# string_Upper
+Make a string uppercase.
+
+## Arguments
+- str (string): the string to make uppercase.
+
+## Returns
+upperString (string): the string in uppercase.
+
+## Raises
+- `AllocFail`: raised if Ground failed to allocate memory for the new string.
+
+## Example
+### Ground
+```python
+call !string_Upper "MY string" &upperString
+println $upperString # "MY STRING"
+```
+
+### Solstice
+```c
+puts string_Upper("MY string") // "MY STRING"
+```
\ No newline at end of file
diff --git a/string/main.so b/string/main.so
new file mode 100755
index 0000000..91dcf73
Binary files /dev/null and b/string/main.so differ
diff --git a/string/mineral.ini b/string/mineral.ini
new file mode 100644
index 0000000..e2365e0
--- /dev/null
+++ b/string/mineral.ini
@@ -0,0 +1,7 @@
+[package]
+description = String utility library.
+version = 1.0.0
+config_version = 1
+
+[dependencies]
+