[LaTeX] Added support for inline math ($...$) in a single line

latex.py

@@ -200,6 +200,47 @@ def expand_against_surrounding_command(string, start, end):
                                            "latex_command_surround")
 
 
+def expand_to_inline_math(string, start, end):
+    # don't expand if a dollar sign is inside the string
+    if re.search(r"(?:[^\\]|^)\$", string[start:end]):
+        return
+
+    line = utils.get_line(string, start, end)
+    escape = inside = False
+    open_pos = close_pos = None
+    # we only need to consider one position, because we have checked it does
+    # not contain any $-signs
+    pos = start - line["start"]
+    for i, char in enumerate(string[line["start"]:line["end"]]):
+        # break if we are behind
+        behind = pos < i
+        if not inside and behind:
+            return
+        if escape:
+            escape = False
+        elif char == "\\":
+            escape = True
+            continue
+        elif char == "$":
+            if not inside:
+                # the inner end of the $-sign
+                open_pos = i + 1
+            elif behind:
+                close_pos = i
+                break
+            inside = not inside
+
+    if open_pos is not None and close_pos is not None:
+        open_pos = line["start"] + open_pos
+        close_pos = line["start"] + close_pos
+        # expand to the outer end
+        if open_pos == start and close_pos == end:
+            open_pos -= 1
+            close_pos += 1
+        return utils.create_return_obj(
+            open_pos, close_pos, string, "latex_inline_math")
+
+
 # TODO could be moved to utils?
 def _closest_result(result1, result2):
     if result1 is None:
@@ -244,6 +285,13 @@ def expand(string, start, end):
         result["expand_stack"] = expand_stack
         return result
 
+    expand_stack.append("latex_inline_math")
+
+    result = expand_to_inline_math(string, start, end)
+    if result:
+        result["expand_stack"] = expand_stack
+        return result
+
     expand_stack.append("latex_environment_matching")
 
     result = expand_against_matching_env(string, start, end)

test/integration_latex.py

@@ -9,6 +9,8 @@ class LatexIntegrationTest(unittest.TestCase):
     def setUpClass(self):
         with open("test/snippets/latex_01.txt", "r") as myfile:
             self.string1 = myfile.read()
+        with open("test/snippets/latex_02.txt", "r") as myfile:
+            self.string2 = myfile.read()
 
     def test_expand_to_word1(self):
         result = expand("\\section*{My Section}", 3, 3, "latex")
@@ -105,5 +107,25 @@ def test_expand_to_env6(self):
         self.assertEqual(result["start"], 73)
         self.assertEqual(result["end"], 311)
 
+    def test_expand_to_inline_math1(self):
+        result = expand(self.string2, 137, 137, "latex")
+        self.assertEqual(result["start"], 136)
+        self.assertEqual(result["end"], 139)
+
+    def test_expand_to_inline_math2(self):
+        result = expand(self.string2, 136, 139, "latex")
+        self.assertEqual(result["start"], 135)
+        self.assertEqual(result["end"], 139)
+
+    def test_expand_to_inline_math3(self):
+        result = expand(self.string2, 135, 139, "latex")
+        self.assertEqual(result["start"], 130)
+        self.assertEqual(result["end"], 145)
+
+    def test_expand_to_inline_math4(self):
+        result = expand(self.string2, 130, 145, "latex")
+        self.assertEqual(result["start"], 129)
+        self.assertEqual(result["end"], 146)
+
 if __name__ == "__main__":
     unittest.main()

test/snippets/latex_02.txt

@@ -0,0 +1,12 @@
+\documentclass[12pt]{article}
+\usepackage{graphicx}
+\usepackage{xcolor}
+
+\begin{document}
+
+\section{My Section}
+
+In the function $f(x, \phi)  = 5$ we see....
+
+
+\end{document}