1 files changed, 79 insertions, 0 deletions
diff --git a/src/parse/properties/opacity.c b/src/parse/properties/opacity.c
new file mode 100644
index 0000000..edad9f8
--- /dev/null
+++ b/src/parse/properties/opacity.c
@@ -0,0 +1,79 @@
+/*
+ * Licensed under the MIT License,
+ *		  http://www.opensource.org/licenses/mit-license.php
+ * Copyright 2010 The NetSurf Browser Project.
+ */
+
+#include <assert.h>
+#include <string.h>
+
+#include "bytecode/bytecode.h"
+#include "bytecode/opcodes.h"
+#include "parse/properties/properties.h"
+#include "parse/properties/utils.h"
+
+/**
+ * Parse opacity
+ *
+ * \param c	  Parsing context
+ * \param vector  Vector of tokens to process
+ * \param ctx	  Pointer to vector iteration context
+ * \param result  resulting style
+ * \return CSS_OK on success,
+ *	   CSS_NOMEM on memory exhaustion,
+ *	   CSS_INVALID if the input is not valid
+ *
+ * Post condition: \a *ctx is updated with the next token to process
+ *		   If the input is invalid, then \a *ctx remains unchanged.
+ */
+css_error css__parse_opacity(css_language *c,
+		const parserutils_vector *vector, int *ctx,
+		css_style *result)
+{
+	int orig_ctx = *ctx;
+	css_error error;
+	const css_token *token;
+	bool match;
+
+	token = parserutils_vector_iterate(vector, ctx);
+	if ((token == NULL) || ((token->type != CSS_TOKEN_IDENT) && (token->type != CSS_TOKEN_NUMBER))) {
+		*ctx = orig_ctx;
+		return CSS_INVALID;
+	}
+
+	if ((token->type == CSS_TOKEN_IDENT) && (lwc_string_caseless_isequal(token->idata, c->strings[INHERIT], &match) == lwc_error_ok && match)) {
+			error = css_stylesheet_style_inherit(result, CSS_PROP_OPACITY);
+	} else if (token->type == CSS_TOKEN_NUMBER) {
+		css_fixed num = 0;
+		size_t consumed = 0;
+
+		num = css__number_from_lwc_string(token->idata, false, &consumed);
+		/* Invalid if there are trailing characters */
+		if (consumed != lwc_string_length(token->idata)) {
+			*ctx = orig_ctx;
+			return CSS_INVALID;
+		}
+
+		/* Clamp to range [0,1] */
+		if (num < 0)
+			num = 0;
+		if (num > INTTOFIX(1))
+			num = INTTOFIX(1);
+
+		error = css__stylesheet_style_appendOPV(result, CSS_PROP_OPACITY, 0, OPACITY_SET);
+		if (error != CSS_OK) {
+			*ctx = orig_ctx;
+			return error;
+		}
+
+		error = css__stylesheet_style_append(result, num);
+	} else {
+		error = CSS_INVALID;
+	}
+
+	if (error != CSS_OK)
+		*ctx = orig_ctx;
+	
+	return error;
+}
+