From 8f9cf0d4856bb53009bb58b53a42e21e2cd1e947 Mon Sep 17 00:00:00 2001
From: Kyle Gunger <corechg@gmail.com>
Date: Sun, 28 Jun 2020 14:30:45 -0400
Subject: [Initial parser] Upload existing

---
 src/tparse/parse.go | 203 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 203 insertions(+)
 create mode 100644 src/tparse/parse.go

(limited to 'src/tparse/parse.go')

diff --git a/src/tparse/parse.go b/src/tparse/parse.go
new file mode 100644
index 0000000..e9e1ee6
--- /dev/null
+++ b/src/tparse/parse.go
@@ -0,0 +1,203 @@
+package tparse
+
+import (
+	"bufio"
+	"io"
+	"os"
+	"strings"
+	"unicode"
+	"unicode/utf8"
+)
+
+// Read in a number (may be a float)
+func numericLiteral(r *bufio.Reader) Token {
+	decimal := false
+	run, _, err := r.ReadRune()
+
+	b := strings.Builder{}
+
+	for ; err == nil; run, _, err = r.ReadRune() {
+		if (run == '.' || run == ',') && !decimal {
+			decimal = true
+		} else if !unicode.IsNumber(run) {
+			break
+		}
+		b.WriteRune(run)
+	}
+
+	r.UnreadRune()
+
+	return Token{Type: LITERAL, Data: b.String()}
+}
+
+// Parse a string (will escape \" only in this stage)
+func stringLiteral(r *bufio.Reader) Token {
+	escape := false
+	run, _, err := r.ReadRune()
+
+	if run != '"' {
+		return Token{Type: LITERAL}
+	}
+
+	b := strings.Builder{}
+
+	for ; err == nil; run, _, err = r.ReadRune() {
+		b.WriteRune(run)
+		if run == '\\' && !escape {
+			escape = true
+		} else if run == '"' && !escape {
+			break
+		}
+
+	}
+
+	return Token{Type: LITERAL, Data: b.String()}
+}
+
+// Parse a character in (escape \\ or \')
+func charLiteral(r *bufio.Reader) Token {
+	escape := false
+	run, _, err := r.ReadRune()
+
+	if run != '\'' {
+		return Token{Type: LITERAL}
+	}
+
+	b := strings.Builder{}
+
+	for ; err == nil; run, _, err = r.ReadRune() {
+		b.WriteRune(run)
+		if run == '\\' && !escape {
+			escape = true
+		} else if run == '\'' && !escape {
+			break
+		}
+
+	}
+
+	return Token{Type: LITERAL, Data: b.String()}
+}
+
+// Split reserved runes into rune groups
+func splitResRunes(str string, max int) []Token {
+	out := []Token{}
+
+	rs := StringAsRunes(str)
+	s, e := 0, max
+
+	if max > len(rs) {
+		e = len(rs)
+	}
+
+	for e <= len(rs) && s < len(rs) {
+		if checkRuneGroup(RunesAsString(rs[s:e])) != -1 || e == s+1 {
+			tmp := RunesAsString(rs[s:e])
+			out = append(out, Token{Type: checkRuneGroup(tmp), Data: tmp})
+			s = e
+			if s+max < len(rs) {
+				e = s + max
+			} else {
+				e = len(rs)
+			}
+		} else if e != s+1 {
+			e--
+		}
+	}
+
+	return out
+}
+
+// ParseFile tries to read a file and turn it into a series of tokens
+func ParseFile(path string) []Token {
+	out := []Token{}
+
+	fd, err := os.Open(path)
+
+	if err != nil {
+		return out
+	}
+
+	read := bufio.NewReader(fd)
+
+	b := strings.Builder{}
+
+	max := maxResRunes()
+
+	for r := ' '; ; r, _, err = read.ReadRune() {
+		// If error in stream or EOF, break
+		if err != nil {
+			if err != io.EOF {
+				out = append(out, Token{Type: -1})
+			}
+			break
+		}
+
+		// Checking for a space
+		if unicode.IsSpace(r) {
+			if b.String() != "" {
+				out = append(out, Token{Type: checkToken(b.String()), Data: b.String()})
+				b.Reset()
+			}
+			continue
+		}
+
+		// Checking for a rune group
+		if checkResRune(r) != -1 {
+			if b.String() != "" {
+				out = append(out, Token{Type: checkToken(b.String()), Data: b.String()})
+				b.Reset()
+			}
+
+			for ; err == nil; r, _, err = read.ReadRune() {
+				if checkResRune(r) == -1 {
+					break
+				}
+				b.WriteRune(r)
+			}
+
+			read.UnreadRune()
+
+			out = append(out, splitResRunes(b.String(), max)...)
+
+			b.Reset()
+
+			continue
+		}
+
+		// Accumulate
+		b.WriteRune(r)
+	}
+
+	return out
+}
+
+// StringAsRunes returns a string as a rune slice
+func StringAsRunes(s string) []rune {
+	out := []rune{}
+	for i, j := 0, 0; i < len(s); i += j {
+		r, w := utf8.DecodeRuneInString(s[i:])
+		out = append(out, r)
+		j = w
+	}
+	return out
+}
+
+// BytesAsRunes returns a byte slice as a rune slice
+func BytesAsRunes(b []byte) []rune {
+	out := []rune{}
+	for i, j := 0, 0; i < len(b); i += j {
+		r, w := utf8.DecodeRune(b[i:])
+		out = append(out, r)
+		j = w
+	}
+	return out
+}
+
+// RunesAsString returns a string from a slice of runes
+func RunesAsString(rs []rune) string {
+	b := strings.Builder{}
+	for _, r := range rs {
+		b.WriteRune(r)
+	}
+	return b.String()
+}
-- 
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