1 files changed, 520 insertions, 0 deletions
diff --git a/src/LexAda.cpp b/src/LexAda.cpp
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index 0000000..0227ce1
--- /dev/null
+++ b/src/LexAda.cpp
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+// Scintilla source code edit control
+/** @file LexAda.cxx
+ ** Lexer for Ada 95
+ **/
+// Copyright 2002 by Sergey Koshcheyev <[email protected]>
+// The License.txt file describes the conditions under which this software may be distributed.
+
+#include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "Platform.h"
+
+#include "Accessor.h"
+#include "StyleContext.h"
+#include "PropSet.h"
+#include "KeyWords.h"
+#include "SciLexer.h"
+#include "SString.h"
+
+/*
+ * Interface
+ */
+
+static void ColouriseDocument(
+    unsigned int startPos,
+    int length,
+    int initStyle,
+    WordList *keywordlists[],
+    Accessor &styler);
+
+static const char * const adaWordListDesc[] = {
+	"Keywords",
+	0
+};
+
+LexerModule lmAda(SCLEX_ADA, ColouriseDocument, "ada", NULL, adaWordListDesc);
+
+/*
+ * Implementation
+ */
+
+// Functions that have apostropheStartsAttribute as a parameter set it according to whether
+// an apostrophe encountered after processing the current token will start an attribute or
+// a character literal.
+static void ColouriseCharacter(StyleContext& sc, bool& apostropheStartsAttribute);
+static void ColouriseComment(StyleContext& sc, bool& apostropheStartsAttribute);
+static void ColouriseContext(StyleContext& sc, char chEnd, int stateEOL);
+static void ColouriseDelimiter(StyleContext& sc, bool& apostropheStartsAttribute);
+static void ColouriseLabel(StyleContext& sc, WordList& keywords, bool& apostropheStartsAttribute);
+static void ColouriseNumber(StyleContext& sc, bool& apostropheStartsAttribute);
+static void ColouriseString(StyleContext& sc, bool& apostropheStartsAttribute);
+static void ColouriseWhiteSpace(StyleContext& sc, bool& apostropheStartsAttribute);
+static void ColouriseWord(StyleContext& sc, WordList& keywords, bool& apostropheStartsAttribute);
+
+static inline bool IsDelimiterCharacter(int ch);
+static inline bool IsNumberStartCharacter(int ch);
+static inline bool IsNumberCharacter(int ch);
+static inline bool IsSeparatorOrDelimiterCharacter(int ch);
+static bool IsValidIdentifier(const SString& identifier);
+static bool IsValidNumber(const SString& number);
+static inline bool IsWordStartCharacter(int ch);
+static inline bool IsWordCharacter(int ch);
+
+static void ColouriseCharacter(StyleContext& sc, bool& apostropheStartsAttribute) {
+	apostropheStartsAttribute = true;
+
+	sc.SetState(SCE_ADA_CHARACTER);
+
+	// Skip the apostrophe and one more character (so that '' is shown as non-terminated and '''
+	// is handled correctly)
+	sc.Forward();
+	sc.Forward();
+
+	ColouriseContext(sc, '\'', SCE_ADA_CHARACTEREOL);
+}
+
+static void ColouriseContext(StyleContext& sc, char chEnd, int stateEOL) {
+	while (!sc.atLineEnd && !sc.Match(chEnd)) {
+		sc.Forward();
+	}
+
+	if (!sc.atLineEnd) {
+		sc.ForwardSetState(SCE_ADA_DEFAULT);
+	} else {
+		sc.ChangeState(stateEOL);
+	}
+}
+
+static void ColouriseComment(StyleContext& sc, bool& /*apostropheStartsAttribute*/) {
+	// Apostrophe meaning is not changed, but the parameter is present for uniformity
+
+	sc.SetState(SCE_ADA_COMMENTLINE);
+
+	while (!sc.atLineEnd) {
+		sc.Forward();
+	}
+}
+
+static void ColouriseDelimiter(StyleContext& sc, bool& apostropheStartsAttribute) {
+	apostropheStartsAttribute = sc.Match (')');
+	sc.SetState(SCE_ADA_DELIMITER);
+	sc.ForwardSetState(SCE_ADA_DEFAULT);
+}
+
+static void ColouriseLabel(StyleContext& sc, WordList& keywords, bool& apostropheStartsAttribute) {
+	apostropheStartsAttribute = false;
+
+	sc.SetState(SCE_ADA_LABEL);
+
+	// Skip "<<"
+	sc.Forward();
+	sc.Forward();
+
+	SString identifier;
+
+	while (!sc.atLineEnd && !IsSeparatorOrDelimiterCharacter(sc.ch)) {
+		identifier += static_cast<char>(tolower(sc.ch));
+		sc.Forward();
+	}
+
+	// Skip ">>"
+	if (sc.Match('>', '>')) {
+		sc.Forward();
+		sc.Forward();
+	} else {
+		sc.ChangeState(SCE_ADA_ILLEGAL);
+	}
+
+	// If the name is an invalid identifier or a keyword, then make it invalid label
+	if (!IsValidIdentifier(identifier) || keywords.InList(identifier.c_str())) {
+		sc.ChangeState(SCE_ADA_ILLEGAL);
+	}
+
+	sc.SetState(SCE_ADA_DEFAULT);
+
+}
+
+static void ColouriseNumber(StyleContext& sc, bool& apostropheStartsAttribute) {
+	apostropheStartsAttribute = true;
+
+	SString number;
+	sc.SetState(SCE_ADA_NUMBER);
+
+	// Get all characters up to a delimiter or a separator, including points, but excluding
+	// double points (ranges).
+	while (!IsSeparatorOrDelimiterCharacter(sc.ch) || (sc.ch == '.' && sc.chNext != '.')) {
+		number += static_cast<char>(sc.ch);
+		sc.Forward();
+	}
+
+	// Special case: exponent with sign
+	if ((sc.chPrev == 'e' || sc.chPrev == 'E') &&
+	        (sc.ch == '+' || sc.ch == '-')) {
+		number += static_cast<char>(sc.ch);
+		sc.Forward ();
+
+		while (!IsSeparatorOrDelimiterCharacter(sc.ch)) {
+			number += static_cast<char>(sc.ch);
+			sc.Forward();
+		}
+	}
+
+	if (!IsValidNumber(number)) {
+		sc.ChangeState(SCE_ADA_ILLEGAL);
+	}
+
+	sc.SetState(SCE_ADA_DEFAULT);
+}
+
+static void ColouriseString(StyleContext& sc, bool& apostropheStartsAttribute) {
+	apostropheStartsAttribute = true;
+
+	sc.SetState(SCE_ADA_STRING);
+	sc.Forward();
+
+	ColouriseContext(sc, '"', SCE_ADA_STRINGEOL);
+}
+
+static void ColouriseWhiteSpace(StyleContext& sc, bool& /*apostropheStartsAttribute*/) {
+	// Apostrophe meaning is not changed, but the parameter is present for uniformity
+	sc.SetState(SCE_ADA_DEFAULT);
+	sc.ForwardSetState(SCE_ADA_DEFAULT);
+}
+
+static void ColouriseWord(StyleContext& sc, WordList& keywords, bool& apostropheStartsAttribute) {
+	apostropheStartsAttribute = true;
+	sc.SetState(SCE_ADA_IDENTIFIER);
+
+	SString word;
+
+	while (!sc.atLineEnd && !IsSeparatorOrDelimiterCharacter(sc.ch)) {
+		word += static_cast<char>(tolower(sc.ch));
+		sc.Forward();
+	}
+
+	if (!IsValidIdentifier(word)) {
+		sc.ChangeState(SCE_ADA_ILLEGAL);
+
+	} else if (keywords.InList(word.c_str())) {
+		sc.ChangeState(SCE_ADA_WORD);
+
+		if (word != "all") {
+			apostropheStartsAttribute = false;
+		}
+	}
+
+	sc.SetState(SCE_ADA_DEFAULT);
+}
+
+//
+// ColouriseDocument
+//
+
+static void ColouriseDocument(
+    unsigned int startPos,
+    int length,
+    int initStyle,
+    WordList *keywordlists[],
+    Accessor &styler) {
+	WordList &keywords = *keywordlists[0];
+
+	StyleContext sc(startPos, length, initStyle, styler);
+
+	int lineCurrent = styler.GetLine(startPos);
+	bool apostropheStartsAttribute = (styler.GetLineState(lineCurrent) & 1) != 0;
+
+	while (sc.More()) {
+		if (sc.atLineEnd) {
+			// Go to the next line
+			sc.Forward();
+			lineCurrent++;
+
+			// Remember the line state for future incremental lexing
+			styler.SetLineState(lineCurrent, apostropheStartsAttribute);
+
+			// Don't continue any styles on the next line
+			sc.SetState(SCE_ADA_DEFAULT);
+		}
+
+		// Comments
+		if (sc.Match('-', '-')) {
+			ColouriseComment(sc, apostropheStartsAttribute);
+
+		// Strings
+		} else if (sc.Match('"')) {
+			ColouriseString(sc, apostropheStartsAttribute);
+
+		// Characters
+		} else if (sc.Match('\'') && !apostropheStartsAttribute) {
+			ColouriseCharacter(sc, apostropheStartsAttribute);
+
+		// Labels
+		} else if (sc.Match('<', '<')) {
+			ColouriseLabel(sc, keywords, apostropheStartsAttribute);
+
+		// Whitespace
+		} else if (IsASpace(sc.ch)) {
+			ColouriseWhiteSpace(sc, apostropheStartsAttribute);
+
+		// Delimiters
+		} else if (IsDelimiterCharacter(sc.ch)) {
+			ColouriseDelimiter(sc, apostropheStartsAttribute);
+
+		// Numbers
+		} else if (IsADigit(sc.ch) || sc.ch == '#') {
+			ColouriseNumber(sc, apostropheStartsAttribute);
+
+		// Keywords or identifiers
+		} else {
+			ColouriseWord(sc, keywords, apostropheStartsAttribute);
+		}
+	}
+
+	sc.Complete();
+}
+
+static inline bool IsDelimiterCharacter(int ch) {
+	switch (ch) {
+	case '&':
+	case '\'':
+	case '(':
+	case ')':
+	case '*':
+	case '+':
+	case ',':
+	case '-':
+	case '.':
+	case '/':
+	case ':':
+	case ';':
+	case '<':
+	case '=':
+	case '>':
+	case '|':
+		return true;
+	default:
+		return false;
+	}
+}
+
+static inline bool IsNumberCharacter(int ch) {
+	return IsNumberStartCharacter(ch) ||
+	       ch == '_' ||
+	       ch == '.' ||
+	       ch == '#' ||
+	       (ch >= 'a' && ch <= 'f') ||
+	       (ch >= 'A' && ch <= 'F');
+}
+
+static inline bool IsNumberStartCharacter(int ch) {
+	return IsADigit(ch);
+}
+
+static inline bool IsSeparatorOrDelimiterCharacter(int ch) {
+	return IsASpace(ch) || IsDelimiterCharacter(ch);
+}
+
+static bool IsValidIdentifier(const SString& identifier) {
+	// First character can't be '_', so initialize the flag to true
+	bool lastWasUnderscore = true;
+
+	size_t length = identifier.length();
+
+	// Zero-length identifiers are not valid (these can occur inside labels)
+	if (length == 0) {
+		return false;
+	}
+
+	// Check for valid character at the start
+	if (!IsWordStartCharacter(identifier[0])) {
+		return false;
+	}
+
+	// Check for only valid characters and no double underscores
+	for (size_t i = 0; i < length; i++) {
+		if (!IsWordCharacter(identifier[i]) ||
+		        (identifier[i] == '_' && lastWasUnderscore)) {
+			return false;
+		}
+		lastWasUnderscore = identifier[i] == '_';
+	}
+
+	// Check for underscore at the end
+	if (lastWasUnderscore == true) {
+		return false;
+	}
+
+	// All checks passed
+	return true;
+}
+
+static bool IsValidNumber(const SString& number) {
+	int hashPos = number.search("#");
+	bool seenDot = false;
+
+	size_t i = 0;
+	size_t length = number.length();
+
+	if (length == 0)
+		return false; // Just in case
+
+	// Decimal number
+	if (hashPos == -1) {
+		bool canBeSpecial = false;
+
+		for (; i < length; i++) {
+			if (number[i] == '_') {
+				if (!canBeSpecial) {
+					return false;
+				}
+				canBeSpecial = false;
+			} else if (number[i] == '.') {
+				if (!canBeSpecial || seenDot) {
+					return false;
+				}
+				canBeSpecial = false;
+				seenDot = true;
+			} else if (IsADigit(number[i])) {
+				canBeSpecial = true;
+			} else {
+				break;
+			}
+		}
+
+		if (!canBeSpecial)
+			return false;
+	} else {
+		// Based number
+		bool canBeSpecial = false;
+		int base = 0;
+
+		// Parse base
+		for (; i < length; i++) {
+			int ch = number[i];
+			if (ch == '_') {
+				if (!canBeSpecial)
+					return false;
+				canBeSpecial = false;
+			} else if (IsADigit(ch)) {
+				base = base * 10 + (ch - '0');
+				if (base > 16)
+					return false;
+				canBeSpecial = true;
+			} else if (ch == '#' && canBeSpecial) {
+				break;
+			} else {
+				return false;
+			}
+		}
+
+		if (base < 2)
+			return false;
+		if (i == length)
+			return false;
+
+		i++; // Skip over '#'
+
+		// Parse number
+		canBeSpecial = false;
+
+		for (; i < length; i++) {
+			int ch = tolower(number[i]);
+
+			if (ch == '_') {
+				if (!canBeSpecial) {
+					return false;
+				}
+				canBeSpecial = false;
+
+			} else if (ch == '.') {
+				if (!canBeSpecial || seenDot) {
+					return false;
+				}
+				canBeSpecial = false;
+				seenDot = true;
+
+			} else if (IsADigit(ch)) {
+				if (ch - '0' >= base) {
+					return false;
+				}
+				canBeSpecial = true;
+
+			} else if (ch >= 'a' && ch <= 'f') {
+				if (ch - 'a' + 10 >= base) {
+					return false;
+				}
+				canBeSpecial = true;
+
+			} else if (ch == '#' && canBeSpecial) {
+				break;
+
+			} else {
+				return false;
+			}
+		}
+
+		if (i == length) {
+			return false;
+		}
+
+		i++;
+	}
+
+	// Exponent (optional)
+	if (i < length) {
+		if (number[i] != 'e' && number[i] != 'E')
+			return false;
+
+		i++; // Move past 'E'
+
+		if (i == length) {
+			return false;
+		}
+
+		if (number[i] == '+')
+			i++;
+		else if (number[i] == '-') {
+			if (seenDot) {
+				i++;
+			} else {
+				return false; // Integer literals should not have negative exponents
+			}
+		}
+
+		if (i == length) {
+			return false;
+		}
+
+		bool canBeSpecial = false;
+
+		for (; i < length; i++) {
+			if (number[i] == '_') {
+				if (!canBeSpecial) {
+					return false;
+				}
+				canBeSpecial = false;
+			} else if (IsADigit(number[i])) {
+				canBeSpecial = true;
+			} else {
+				return false;
+			}
+		}
+
+		if (!canBeSpecial)
+			return false;
+	}
+
+	// if i == length, number was parsed successfully.
+	return i == length;
+}
+
+static inline bool IsWordCharacter(int ch) {
+	return IsWordStartCharacter(ch) || IsADigit(ch);
+}
+
+static inline bool IsWordStartCharacter(int ch) {
+	return (isascii(ch) && isalpha(ch)) || ch == '_';
+}